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University of Adelaide
1.
Zarghami, Seyed Ashkan.
A Complex System Approach to Reliability Analysis of Water Distribution Networks.
Degree: 2019, University of Adelaide
URL: http://hdl.handle.net/2440/124607 
► Water Distribution Networks (WDNs) are confronted with numerous operational threats that lead to disruption and dysfunction of their performance. As a response to the growing…
(more)
▼ Water Distribution Networks (WDNs) are confronted with numerous operational threats that lead to disruption and dysfunction of their performance. As a response to the growing operational dysfunctions, researchers have recognised the importance of using reliability theory to examine the ability of WDNs to provide continuity in operation. However, the current approaches to reliability analysis of these networks mainly focus on one aspect of the reliability problem and fail to provide a complete representation of all factors involved in reliability analysis. These methods are embedded in capturing either the topological properties or the hydraulic attributes of WDNs. On one hand, the hydraulic-based approaches yield insufficient information as to the structural complexity and the level of interaction among components. On the other hand, the existing topological-based approaches just capture very generic topological properties and ignore various hydraulic attributes of WDNs such as demand and pressure head. Furthermore, the conventional reliability analysis methods are only effective for demonstrating a snapshot of these networks at a given point in time and ignore the variation in the parameters involved in the reliability analysis. This thesis attempts to fill these gaps by generating new knowledge in the area of reliability analysis of WDNs through using a combination of scientific approaches. This includes reliability engineering,
system thinking, network theory, probabilistic analysis and hydraulic engineering. It is in this spirit that this research introduces a three-tiered approach. Tier 1 is explicitly tied to evaluate the topological reliability of WDNs. Tier 2 will be developed based on the results of Tier 1, aimed at establishing an integrated framework for reliability analysis. Tier 3 will use the outputs generated by tier 2 and will attempt to capture the dynamic nature of WDNs. In attempting to develop a comprehensive reliability assessment model, the present thesis proposes a number of novel reliability analysis methods for WDNs. Using three case studies from the literature as well as four real-world WDNs of Australian towns, this thesis demonstrates the effectiveness of the proposed methods. This research provides two types of implications. For theory development, it offers new insight and interpretation into the reliability analysis of WDNs by integrating a broad spectrum of various approaches. For
water engineering management, the predictive maintenance strategy based on the reliability assessment model proposed here will provide an expert facilitator that helps
water service providers to establish and implement a cost-effective maintenance strategy, which relies on identifying and prioritising the vulnerabilities, thereby reducing expenditures on the maintenance activities.
Advisors/Committee Members: Gunawan, Indra (advisor), Schultmann, Frank (advisor), Business School (school).
Subjects/Keywords: Complex System; Reliability Analysis; Water Distribution Networks
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APA (6th Edition):
Zarghami, S. A. (2019). A Complex System Approach to Reliability Analysis of Water Distribution Networks. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/124607
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Zarghami, Seyed Ashkan. “A Complex System Approach to Reliability Analysis of Water Distribution Networks.” 2019. Thesis, University of Adelaide. Accessed March 06, 2021.
http://hdl.handle.net/2440/124607.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zarghami, Seyed Ashkan. “A Complex System Approach to Reliability Analysis of Water Distribution Networks.” 2019. Web. 06 Mar 2021.
Vancouver:
Zarghami SA. A Complex System Approach to Reliability Analysis of Water Distribution Networks. [Internet] [Thesis]. University of Adelaide; 2019. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/2440/124607.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zarghami SA. A Complex System Approach to Reliability Analysis of Water Distribution Networks. [Thesis]. University of Adelaide; 2019. Available from: http://hdl.handle.net/2440/124607
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Illinois – Urbana-Champaign
2.
Ling, Fangqiong.
Impact of Chloramination on the Development of Oligotrophic Biofilms.
Degree: MS, 0231, 2011, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/26411
► This study aimed to i) determine the effectiveness of monochloramine disinfection on biofilm control and ii) characterize the architecture and community development of laboratory-grown oligotrophic…
(more)
▼ This study aimed to i) determine the effectiveness of monochloramine disinfection on biofilm control and ii) characterize the architecture and community development of laboratory-grown oligotrophic biofilms over a two-month period. Biofilm development and disinfection were realized in Center for Disease Control (CDC) reactor systems with PVC coupons as the substratum and groundwater as the seeding and growth nutrient. To compare biofilm development under disinfection against its natural development, two CDC reactors (treatment and control) were operated. In the treatment reactor, chloramination at 8.5 ± 0.2 mg Cl2/L as combined chlorine was applied after two weeks of biofilm growth till the end of week 10. Confocal laser scanning microscopy combined with quantitative analysis using COMSTAT program revealed that disinfection resulted in a reduction of average thickness and biomass volume by 83.6% and 81.8%, respectively, and an increase in compactness by 76.5%, suggesting the formation of a thin and compact biofilm with low biomass. In contrast, biofilm development in the control reactor led to an increase in average thickness and biomass volume by a factor of 5.2 and 47.1%, and a reduction in compactness by 75.5%. As the result, thicker and fluffier biofilm architecture was observed. Biofilm community structure change was revealed by cluster analysis and non-metric multidimensional scaling based on 16S rRNA gene-based microbial fingerprinting analysis. Samples from different reactors at the same time point had a high similarity before disinfection, but became dissimilar after disinfection. This suggested that disinfection could lead to the development of a biofilm community with a distinctive community structure. Overall findings suggest that disinfection could influence the growth of multi-species biofilms on PVC surface, shape the biofilm architecture, and select a microbial community thatcan survive, adapt, or proliferate under chloramination. These findings are important to better understand biofilm growth in chloraminated drinking
water distribution systems.
Advisors/Committee Members: Liu, Wen-Tso (advisor).
Subjects/Keywords: drinking water distribution system; biofilm; chloramination
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APA (6th Edition):
Ling, F. (2011). Impact of Chloramination on the Development of Oligotrophic Biofilms. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/26411
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ling, Fangqiong. “Impact of Chloramination on the Development of Oligotrophic Biofilms.” 2011. Thesis, University of Illinois – Urbana-Champaign. Accessed March 06, 2021.
http://hdl.handle.net/2142/26411.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ling, Fangqiong. “Impact of Chloramination on the Development of Oligotrophic Biofilms.” 2011. Web. 06 Mar 2021.
Vancouver:
Ling F. Impact of Chloramination on the Development of Oligotrophic Biofilms. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2011. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/2142/26411.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ling F. Impact of Chloramination on the Development of Oligotrophic Biofilms. [Thesis]. University of Illinois – Urbana-Champaign; 2011. Available from: http://hdl.handle.net/2142/26411
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Indian Institute of Science
3.
Manohar, Usha.
Modeling and Analysis of Water Distribution Systems.
Degree: PhD, Faculty of Engineering, 2018, Indian Institute of Science
URL: http://etd.iisc.ac.in/handle/2005/2992
► In most of the urban cities of developing countries piped water supply is intermittent and they receive water on alternate days for about few hours.…
(more)
▼ In most of the urban cities of developing countries piped
water supply is intermittent and they receive
water on alternate days for about few hours. The Unaccounted For
Water (UFW) in these cities is very high due to aged infrastructure, poor management and operation of the
system. In the cities of developing countries, supplied
water is not able to meet the demand and there is huge gap between supply and demand of
water. To meet the
water demand people are depending on other sources of
water like groundwater, rain
water harvesting, waste
water treatment, desalination etc. Huge quantity of groundwater is extracted without any account for the quantity of
water used. The main challenge for
water authorities is to meet the consumer demands at varying loading conditions. However, the present execution of decisions in the operational management of WDS is through manual control. The manual control of valve throttling and control of pump speed, reduces the efficiency and operation of WDS. In such cases,
system modeling coupled with automated control can play a significant role in the appropriate execution and operation of the
system. In the past few decades, there has been a major development in the field of modeling and analysing
water distribution systems. Most of the people in Indian mega cities are facing
water problems as they are not able to receive safe reliable drinking
water. In rapidly growing cities, the
water resources management has been a major concern for the Government. There is always a need to optimize the available
water resources when the rate of demand constantly beats the rate of replenishments.
Mathematical modeling of WDS has become an indispensible tool since the ages to model any type of WDS. Development of mathematical models of WDS is necessary to analyse the
system behavior for a wide range of operating conditions. Using models, problems can be anticipated in proposed or existing systems, and solutions can be evaluated before time, money, and materials are invested in a real-world project.
In the present study, we have developed a model of WDS of a typical city like Bangalore, India and analysed them for several scenarios and operating conditions. Bangalore WDS is modeled using EPANET. Before a network model is used for analysis purpose, it must be ensured that the model is predicting the behavior of the
system with reasonable accuracy. The process of matching the parameters of the developed model and the field observed data is known as calibration. All WDS require calibration for effective modeling and simulation of the
system. Demand and roughness are the most uncertain parameters and they are adjusted repeatedly to get the required head at nodes and flow in the pipes. The calibration parameters usually include pipe roughness, valve settings, pipe diameter and demand. Pipe roughness, valve settings and pipe diameter are associated with the flow conditions and the demands relate to the boundary conditions. For Bangalore WDS, the values of roughness coefficient and demand are available; and…
Advisors/Committee Members: Mohan Kumar, M S (advisor).
Subjects/Keywords: Water Distribution System Modeling; Water Distribution System Reliability Analysis; Water Distribution Systems (WDS); Water Supply Management; Water Resources Development; Water Balance (Hydrology); Hydraulic Modeling; Water Distribution System - Bangalore City; Water Balance - Hebbal City; Urban Water Supply; Water Distribution System Calibration; Piped Water Supply; Water Supply - Accounting; Equitable Distribution of Water; Water Supply and Management; Water Management System - Bangalore; Civil Engineering
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APA (6th Edition):
Manohar, U. (2018). Modeling and Analysis of Water Distribution Systems. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/2992
Chicago Manual of Style (16th Edition):
Manohar, Usha. “Modeling and Analysis of Water Distribution Systems.” 2018. Doctoral Dissertation, Indian Institute of Science. Accessed March 06, 2021.
http://etd.iisc.ac.in/handle/2005/2992.
MLA Handbook (7th Edition):
Manohar, Usha. “Modeling and Analysis of Water Distribution Systems.” 2018. Web. 06 Mar 2021.
Vancouver:
Manohar U. Modeling and Analysis of Water Distribution Systems. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2018. [cited 2021 Mar 06].
Available from: http://etd.iisc.ac.in/handle/2005/2992.
Council of Science Editors:
Manohar U. Modeling and Analysis of Water Distribution Systems. [Doctoral Dissertation]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/2992
Addis Ababa University
4.
Yitayal, Asmare.
Assessment of The Hydraulic Performance of Existing Water Supply Distribution System: A Case Study on Finote-Selam Town, Amhara Region, Ethiopia
.
Degree: 2019, Addis Ababa University
URL: http://10.6.20.92/xmlui/handle/123456789/20888
► This thesis focused on assessment of the hydraulic performance of existing water distribution system: a case study on Finote-Selam town, Amhara region, Ethiopia. The main…
(more)
▼ This thesis focused on assessment of the hydraulic performance of existing
water distribution system: a
case study on Finote-Selam town, Amhara region, Ethiopia. The main objective of this study is to check
the hydraulic performance of Finote-Selam town
water distribution system by assessing demand and
production of
water, losses of
water, hydraulic parameter.
Both secondary and primary data sources were used for this study. Primary data was collected through a
face-to-face interview, field survey, and photographs of relevant sites and infrastructures. The secondary
data was collected from design document, literatures, journals and reports. Moreover, to analyze existing
water distribution system a model was developed by using
Water CAD software. The model can be used
to identify the zone of higher and lower pressure junctions and velocity though the pipe. The model
simulation run was performed for peak and low demand scenarios to analyze the
distribution system. For
calibration of
water distribution system, pipe roughness was considered as the primary calibration
parameter in this study.
The analysis shows that the current total domestic
water demand in town was 1536.75m
3
/day, the
water
supply coverage was 82.4 % and average per capital domestic
water consumption was 37.9 l/c/day.
Hence, this result indicates there is a gap between demand and supply. The
water loss of the town was
32.18% from the total
water production. The apparent loss covers 9.18% while, the real losses covers
23% of the total losses. Simulation results for maximum and minimum pressure and velocity different
scenarios were used as a base tool to evaluate the hydraulic performance. Modeling results showed
violation of maximum and minimum pressure and velocity criteria at different junctions and pipes. After
modifying the existing
water distribution system 92.18% of the junctions are in the recommended
pressure range and 75.46% of the pipes are in the recommended velocity range.
Generally the result of the analysis shows that the overall hydraulic performance of
water distribution of
the town was poor, which is reflected by low
water production rate, low
water consumption, and high
level of Non-revenue
water, low service coverage, not velocity and pressure in permissible range.
Therefore, it is significant to rehabilitate and improve the
water distribution system capacities,
establishing pressure zone, increase pumping rate and drilling additional borehole. In addition providing
more attention to
water losses reduction policies and strategies are vital for remedial measures.
Advisors/Committee Members: Geremew, Sahilu (PhD) (advisor).
Subjects/Keywords: Water demand;
Hydraulic performance;
Simulation;
Water distribution system;
water losses
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APA ·
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Manager
APA (6th Edition):
Yitayal, A. (2019). Assessment of The Hydraulic Performance of Existing Water Supply Distribution System: A Case Study on Finote-Selam Town, Amhara Region, Ethiopia
. (Thesis). Addis Ababa University. Retrieved from http://10.6.20.92/xmlui/handle/123456789/20888
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Yitayal, Asmare. “Assessment of The Hydraulic Performance of Existing Water Supply Distribution System: A Case Study on Finote-Selam Town, Amhara Region, Ethiopia
.” 2019. Thesis, Addis Ababa University. Accessed March 06, 2021.
http://10.6.20.92/xmlui/handle/123456789/20888.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Yitayal, Asmare. “Assessment of The Hydraulic Performance of Existing Water Supply Distribution System: A Case Study on Finote-Selam Town, Amhara Region, Ethiopia
.” 2019. Web. 06 Mar 2021.
Vancouver:
Yitayal A. Assessment of The Hydraulic Performance of Existing Water Supply Distribution System: A Case Study on Finote-Selam Town, Amhara Region, Ethiopia
. [Internet] [Thesis]. Addis Ababa University; 2019. [cited 2021 Mar 06].
Available from: http://10.6.20.92/xmlui/handle/123456789/20888.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Yitayal A. Assessment of The Hydraulic Performance of Existing Water Supply Distribution System: A Case Study on Finote-Selam Town, Amhara Region, Ethiopia
. [Thesis]. Addis Ababa University; 2019. Available from: http://10.6.20.92/xmlui/handle/123456789/20888
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Indian Institute of Science
5.
Rai, Pawan Kumar.
Development And Control Of Urban Water Network Models.
Degree: MSc Engg, Faculty of Engineering, 2013, Indian Institute of Science
URL: http://etd.iisc.ac.in/handle/2005/2271
► Water distribution systems convey drinking water from treatment plant and make available to consumers’ taps. It consists of essential components like pipes, valves, pumps, tanks…
(more)
▼ Water distribution systems convey drinking
water from treatment plant and make available to consumers’ taps. It consists of essential components like pipes, valves, pumps, tanks and reservoirs etc. The main concern in the working of a
water distribution system is to assure customer demands under a choice of quantity and quality throughout the complete life span for the probable loading situations. However, in some cases, the existing infrastructure may not be adequate to meet the customer’s requirements. In such cases,
system modeling plays an important role in proper management of
water supply systems. In present scenario, modeling plays a significant task in appropriate execution of
water distribution system.
From the angle of taking management decisions valve throttling control and pumps speed control are very important. These operational problems can be addressed by manual control or by automatic control. The problem is the use of manual controls that slow down the effectiveness of the
system. It reduces the efficiency of operation of valve or pump. To improve the efficiency of such
water distribution systems, an automatic control based technology has been developed that links the operation of the variable speed pump control or valve throttling control. By employing an automatic control, the pump can adjust its speed at all times to meet the actual flow requirements of each load served.
In case of real
system design Simulink is the most widely used tool. Commercial software package Matlab/Simulink used for creation of WDS model. The goal was to produce a model that could numerically analyze the dynamic performance of a
water distribution system. A Comparison of single platform methodology (Simulink based control) and double platform methodology (Matlab and EPANET based control) has been done. Nonlinear Dynamic Inversion (DI) Control
system model is developed for WDS model in Matlab/Simulink environment. Controller gain parameters are the very important value in control prospective. If the controller gain parameters are chosen incorrectly, the controlled process input can be unstable, i.e. its output diverges, with or without oscillation Tuning is the adjustment of control parameters (gains) to the optimum values for the desired control response. There are several methods for tuning controller like manual tuning (Trial and error procedure), Ziegler-Nichols method, Output Constraint Tuning (OCT) etc.
Establishment of a pump operational policy by which all the reservoirs can be fed simultaneously to meet their requirements without creating undue transients. Tune the gain of DI controllers by different tuning methods and evaluate the best tuning method on the basis of controller performance. Development of meaningful additional objective is search of lower bound pump speed on the basis of control time or settling time. To bring the pump speeds in feasible range, application of constraint in pumps speed is introduced. The magnitude of constraints can be found using Monte Carlo methods. Monte Carlo methods are…
Advisors/Committee Members: Mohan Kumar, M S (advisor).
Subjects/Keywords: Urban Water Supply; Urban Water Distribution System; Water Resourses - Urban Areas; Water Distribution Systems (WDS); Hydraulic Modeling; Urban Water Network Models; Water Distribution Systems - Modelling; Water Distribution Networks - Control; Water Distribution System - Matlab/Simulink Based Modeling; Water Distribution Network; Hydrology
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APA (6th Edition):
Rai, P. K. (2013). Development And Control Of Urban Water Network Models. (Masters Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/2271
Chicago Manual of Style (16th Edition):
Rai, Pawan Kumar. “Development And Control Of Urban Water Network Models.” 2013. Masters Thesis, Indian Institute of Science. Accessed March 06, 2021.
http://etd.iisc.ac.in/handle/2005/2271.
MLA Handbook (7th Edition):
Rai, Pawan Kumar. “Development And Control Of Urban Water Network Models.” 2013. Web. 06 Mar 2021.
Vancouver:
Rai PK. Development And Control Of Urban Water Network Models. [Internet] [Masters thesis]. Indian Institute of Science; 2013. [cited 2021 Mar 06].
Available from: http://etd.iisc.ac.in/handle/2005/2271.
Council of Science Editors:
Rai PK. Development And Control Of Urban Water Network Models. [Masters Thesis]. Indian Institute of Science; 2013. Available from: http://etd.iisc.ac.in/handle/2005/2271
Cal Poly
6.
Aube, Kyle Eric.
A Comparison of Water Main Failure Prediction Models in San Luis Obispo, CA.
Degree: MS, Civil and Environmental Engineering, 2019, Cal Poly
URL: https://digitalcommons.calpoly.edu/theses/2016
;
10.15368/theses.2019.27
► This study compared four different water main failure prediction models: a statistically simple model, a statistically complex model, a statistically complex model with modifications…
(more)
▼ This study compared four different
water main failure prediction models: a statistically simple model, a statistically complex model, a statistically complex model with modifications termed the 2019 model, and an age-based model. The statistically complex models compute the probability of failure based on age, size, internal pressure, length of pipe in corrosive soil, land use, and material of the. These two values are then used to prioritize a
water main rehabilitation program to effectively use the municipality’s funds. The 2019 model calculates the probability of failure and consequence of failure differently than the statistically complex model by considering corrosive soil data instead of assuming all the pipes are in highly corrosive soil and average daily traffic volume data instead of using street classifications. The statistically simple model only uses the pipe age and material for probability of failure. The age-based model relies purely on the age of the pipe to determine its probability of failure. Consequences of failure are determined by the proximity of the pipe to highly trafficked streets, critical services, pipe replacement cost, and the flow capacity of the pipe. Risk of failure score is the product of the consequence of failure score and probability of failure score. Pipes are then ranked based on risk of failure scores to allow municipalities to determine their pipe rehabilitation schedule.
The results showed that the statistically complex models were preferred because results varied between all four models. The 2019 model is preferred for long-term analysis because it can better account for future traffic growth using the average daily traffic volume. Corrosive soil data did not have a significant impact on the results, which can be attributed to the relatively small regression parameter for corrosive soil. The age-based model is not recommended because results of this study shows it places a significantly high number of pipes in the high and critical risk categories compared to the other models that account for more factors. This could result in the unnecessary replacement of pipes leading to an inefficient allocation of funds.
Keywords: Risk of Failure, Consequence of Failure, Probability of Failure
Advisors/Committee Members: Shikah Rahman.
Subjects/Keywords: Water Distribution System; Water main replacement; Civil Engineering; Hydraulic Engineering
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APA ·
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APA (6th Edition):
Aube, K. E. (2019). A Comparison of Water Main Failure Prediction Models in San Luis Obispo, CA. (Masters Thesis). Cal Poly. Retrieved from https://digitalcommons.calpoly.edu/theses/2016 ; 10.15368/theses.2019.27
Chicago Manual of Style (16th Edition):
Aube, Kyle Eric. “A Comparison of Water Main Failure Prediction Models in San Luis Obispo, CA.” 2019. Masters Thesis, Cal Poly. Accessed March 06, 2021.
https://digitalcommons.calpoly.edu/theses/2016 ; 10.15368/theses.2019.27.
MLA Handbook (7th Edition):
Aube, Kyle Eric. “A Comparison of Water Main Failure Prediction Models in San Luis Obispo, CA.” 2019. Web. 06 Mar 2021.
Vancouver:
Aube KE. A Comparison of Water Main Failure Prediction Models in San Luis Obispo, CA. [Internet] [Masters thesis]. Cal Poly; 2019. [cited 2021 Mar 06].
Available from: https://digitalcommons.calpoly.edu/theses/2016 ; 10.15368/theses.2019.27.
Council of Science Editors:
Aube KE. A Comparison of Water Main Failure Prediction Models in San Luis Obispo, CA. [Masters Thesis]. Cal Poly; 2019. Available from: https://digitalcommons.calpoly.edu/theses/2016 ; 10.15368/theses.2019.27
Clemson University
7.
Chauhan, Varsha.
Planar Graph Generation with Application to Water Distribution Networks.
Degree: MS, School of Computing, 2018, Clemson University
URL: https://tigerprints.clemson.edu/all_theses/2975
► The study of network representations of physical, biological, and social phenomena can help us better understand their structure and functional dynamics as well as formulate…
(more)
▼ The study of network representations of physical, biological, and social phenomena can help us better understand their structure and functional dynamics as well as formulate predictive models of these phenomena. However, in some applications there is a deficiency
in real-world data-sets for research purposes due to such reasons as the data sensitivity and high costs for data retrieval. Research related to
water distribution networks often relies on synthetic data because the real-world is data is not publicly available due to the sensitivity towards theft and misuse.
An important characteristic of
water distribution systems is that they can be embedded in a plane, therefore to simulate these
system we need realistic networks which are also planar. Currently available synthetic network generators can generate networks that exhibit realism but the planarity is not guaranteed. On the other hand, existing
water network generators do not guarantee similarity with the input network and do not scale. In this thesis, we present a flexible method to generate realistic
water distribution networks
with optimized network parameters such as pipe and tank diameters, tank minimum and maximum levels, and pump sizes. Our model consists of three stages. First, we generate a realistic planar graph from a known
water network using the multi-scale randomized edit-
ing. Next, we add physical
water network characteristics such as pumps, pipes, tanks, and reservoirs to the obtained topology to generate a realistic synthetic
water distribution system that can be used for simulation. Finally, we optimize the operational parameters using EPANet simulation tool and multi-objective optimization solver to generate a network with maximum resilience and minimum cost.
Advisors/Committee Members: Dr. Ilya Safro, Committee Chair, Dr. Alexander Herzog, Dr. Kaylan Piratla.
Subjects/Keywords: Multiscale Graph generation; Planar Graphs; Water Distribution System Optimization; Water Networks
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Manager
APA (6th Edition):
Chauhan, V. (2018). Planar Graph Generation with Application to Water Distribution Networks. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/2975
Chicago Manual of Style (16th Edition):
Chauhan, Varsha. “Planar Graph Generation with Application to Water Distribution Networks.” 2018. Masters Thesis, Clemson University. Accessed March 06, 2021.
https://tigerprints.clemson.edu/all_theses/2975.
MLA Handbook (7th Edition):
Chauhan, Varsha. “Planar Graph Generation with Application to Water Distribution Networks.” 2018. Web. 06 Mar 2021.
Vancouver:
Chauhan V. Planar Graph Generation with Application to Water Distribution Networks. [Internet] [Masters thesis]. Clemson University; 2018. [cited 2021 Mar 06].
Available from: https://tigerprints.clemson.edu/all_theses/2975.
Council of Science Editors:
Chauhan V. Planar Graph Generation with Application to Water Distribution Networks. [Masters Thesis]. Clemson University; 2018. Available from: https://tigerprints.clemson.edu/all_theses/2975
Addis Ababa University
8.
Kabeto, Shimeles.
Water Supply Coverage and Water Loss in Distribution System with Modeling
.
Degree: 2012, Addis Ababa University
URL: http://etd.aau.edu.et/dspace/handle/123456789/4387
► Leakage in water distribution pipes is a major problem faced by the water industry. Water utilities often employ traditional audit methods to estimate water lost…
(more)
▼ Leakage in
water distribution pipes is a major problem faced by the
water industry.
Water utilities often employ traditional audit methods to estimate
water lost as leakage. As a result demand for additional
water sources and infrastructure is growing. More ever, nearly 37% of the total
water production is loss at different level of
distribution system before reaching to the consumer. The focus of this study is to evaluate the city’s
distribution coverage of the
water supply and evaluating the total
water loss. The
water supply coverage at the city level and the total
water loss both at the city level and at the sub
system level, the collected data was assembled in EPANET and controls were added to best represent the functioning of the
water system.
Water production that is only for the city and the
water consumption as aggregated from individual customer meter reading was to evaluate the total
water loss at the city level. Select the pilot area in around Gottera the selection of the area from the branch based on the following criteria. Hydraulically easily desecrate area, 24hr
water availability, Customer not more than 1000, and more leakage complain. The sub-
system that has isolated networks and production and consumption data were used to evaluate and compare the spatial
distribution of
water loss. There are several reasons for the high level of
water loss in Addis Ababa., and some advisory solutions were briefly proposed for the major effect of the
water loss like age of pipe networks, poor maintenance of networks,
water scheduling, customer side leakage and illegal connection. The reduction of NRW (Non Revenue
Water) by
Water Balance Method shows the difference between predicted and actual
water losses in
water distribution network, The results also shows that after leakage reduction control works took place, the volume of
water loss in
water distribution network has reduce about 39% of the total production supply to the sub-
system. The
distribution system model was then used to evaluate three alternative scenarios to improve
system performance. The objective of the first and second scenario was to increase the flow rate at taps of low supply; the third scenario aimed at adding taps to parts of the sub-
system without easy access to running
water. The first scenario consisted in opening valves to connect subsystems: it increased the flow rate at taps of large supply more so than at taps of low supply. This scenario was not recommended because it would quickly drain parts of the
water supply.
Advisors/Committee Members: Dr. Yilma Sileshi (advisor).
Subjects/Keywords: Water Supply Coverage;
Water Loss in Distribution System
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APA (6th Edition):
Kabeto, S. (2012). Water Supply Coverage and Water Loss in Distribution System with Modeling
. (Thesis). Addis Ababa University. Retrieved from http://etd.aau.edu.et/dspace/handle/123456789/4387
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kabeto, Shimeles. “Water Supply Coverage and Water Loss in Distribution System with Modeling
.” 2012. Thesis, Addis Ababa University. Accessed March 06, 2021.
http://etd.aau.edu.et/dspace/handle/123456789/4387.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kabeto, Shimeles. “Water Supply Coverage and Water Loss in Distribution System with Modeling
.” 2012. Web. 06 Mar 2021.
Vancouver:
Kabeto S. Water Supply Coverage and Water Loss in Distribution System with Modeling
. [Internet] [Thesis]. Addis Ababa University; 2012. [cited 2021 Mar 06].
Available from: http://etd.aau.edu.et/dspace/handle/123456789/4387.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kabeto S. Water Supply Coverage and Water Loss in Distribution System with Modeling
. [Thesis]. Addis Ababa University; 2012. Available from: http://etd.aau.edu.et/dspace/handle/123456789/4387
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Arizona
9.
Sifuentes, Laura Yvette.
The Occurrence of Free Living Amoebae in Water
.
Degree: 2012, University of Arizona
URL: http://hdl.handle.net/10150/223345
► The amoebae Naegleria fowleri, Acanthamoeba spp., and Balamuthia mandrillaris are free-living amoebae found in both water and soil. They are opportunistic pathogens in humans. Acanthamoeba…
(more)
▼ The amoebae Naegleria fowleri, Acanthamoeba spp., and Balamuthia mandrillaris are free-living amoebae found in both
water and soil. They are opportunistic pathogens in humans. Acanthamoeba is the most common cause of illness, usually infecting the eyes and sometimes causing a sight-threatening keratitis. Acanthamoeba spp. and B. mandrillaris can cause granulomatous amoebic encephalitis, in addition to infections of the lungs and skin. N. fowleri causes primary amoebic meningoencephalitis . There is little known regarding the ecology and occurrence of these organisms. A total of 36 high-use recreational surface waters in Arizona were surveyed over a period of two years to assess the occurrence of N. fowleri and seasonal and environmental factors. Overall, 9.3% of the warm weather samples collected were positive for N. fowleri, whereas 16.3% of the samples were positive during cold weather. Although the presence of N. fowleri could not be significantly correlated with physical and chemical parameters such as temperature, pH, turbidity, conductivity, and the presence of heterotrophic bacteria, total coliforms, and Escherichia coli, a weak correlation (0.52) with live amoebic activity was observed. Five lakes to the north and northeast of Phoenix tested positive for the N. fowleri on more than one occasion over multiple seasons. Finished drinking
water samples (n= 785) from a municipal potable
distribution system were evaluated for the presence of N. fowleri, B. mandrillaris and Acanthamoeba spp. from 18 different regions during three different sampling periods. Physical and chemical parameters were also evaluated but provided no significant correlations with the occurrence of amoebae or indicator organisms. A total of 138 samples (17.9%) were positive for viable amoebae in
distribution water with more than an adequate chlorine residual (average of 0.86 mg/L). Microorganisms that are typically used to monitor microbial
water quality such as coliforms and E. coli would likely not be found under these circumstances. Clusters with three or more samples testing positive for viable amoebae per region were observed during all three periods. Viable amoebae may not only provide a better assessment of the microbial quality of
water, but such clustering could reveal areas with potential
water quality issues within the
distribution system.
Advisors/Committee Members: Gerba, Charles P (advisor), Pepper, Ian L. (committeemember), Glenn, Edward (committeemember), Bright, Kelly R. (committeemember), Gerba, Charles P. (committeemember).
Subjects/Keywords: Naegleria fowleri;
water;
Soil, Water & Environmental Science;
Amoebae;
Distribution System
Record Details
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Sifuentes, L. Y. (2012). The Occurrence of Free Living Amoebae in Water
. (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/223345
Chicago Manual of Style (16th Edition):
Sifuentes, Laura Yvette. “The Occurrence of Free Living Amoebae in Water
.” 2012. Doctoral Dissertation, University of Arizona. Accessed March 06, 2021.
http://hdl.handle.net/10150/223345.
MLA Handbook (7th Edition):
Sifuentes, Laura Yvette. “The Occurrence of Free Living Amoebae in Water
.” 2012. Web. 06 Mar 2021.
Vancouver:
Sifuentes LY. The Occurrence of Free Living Amoebae in Water
. [Internet] [Doctoral dissertation]. University of Arizona; 2012. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/10150/223345.
Council of Science Editors:
Sifuentes LY. The Occurrence of Free Living Amoebae in Water
. [Doctoral Dissertation]. University of Arizona; 2012. Available from: http://hdl.handle.net/10150/223345
Delft University of Technology
10.
Zhang, Yingfei (author).
Smart Water Meters in Full-scale Drinking Water Distribution Networks (DWDNs).
Degree: 2019, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:c1b7e03d-85c1-435b-9397-b3babedaee50
► For drinking water companies in Netherlands, the current conventional treatment technique may not be fully capable to cope with potential future problems resulted from climate…
(more)
▼ For drinking
water companies in Netherlands, the current conventional treatment technique may not be fully capable to cope with potential future problems resulted from climate change, salinization and social developments, such as population growth. Innovative technologies like reverse osmosis and more strict drinking
water standards are expected to be applied to provide better
water quality to customers. In Oasen drinking
water company, reverse osmosis has been applied in Lekkerkerk drinking
water treatment station since 2016 to prepare for the future challenges, while potential transition effects like biofilms detachment and resuspension of loose deposits in the drinking
water distribution systems might occur under irregular changes caused by supply
water switch. A setup named Smart
Water Meter was developed and used with integrated functions, such as seizing particles inside
distribution networks and monitoring several parameters, to investigate this phenomenon. Although slight and temporary transition effects were captured with the help of this device, the amount of retained materials were not sufficient for transition effects study. According to the company, new treatment stations are being planned where background information is required to be collected and still potential transition effects might occur. The main objective of this research was to optimize the Smart
Water Meter for future transition effects study by re-selecting the pore size of the filter bag to make it more sensitive and install the upgraded setups in four different locations under different
water quality to have a better understanding on its performance and characteristics. Before being applied into the fields, a stagnation (
water retained inside the setup for a long time) test was conducted as well to figure out the feasibility of experiments simplification where
water is kept flowing through the setup instead of intermittent mode and possible deterioration of the
water quality. 10 microns filter bag is selected in this research after three stages tests. Results reveal that the optimized filter bag with new pore size is able to intercept more particles without arousing sudden pressure drop under normal conditions. However, if this setup could set an early alarm, like a sudden pressure drop, when serious transition effects occur remains to be checked in the future. According to the stagnation test, chemical elements concentration and biological activity increased inside the filter bag, meaning that the
water quality was indeed deteriorated when it was stagnated inside the filter bag for 23 hours while the quality could go back to normal after opening both influent and effluent valves on the setup for a while. This also indicates that the simplification of experiments is acceptable. Pore size of the filter bag may require to be reconsidered when the influent pressure in households is not sufficient, otherwise great pressure loss is inevitable. For different
water quality in four locations provided by three drinking
water companies, the…
Advisors/Committee Members: van der Hoek, Jan Peter (mentor), Liu, Gang (mentor), Abraham, Edo (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: drinking water distribution system; Smart Water Meter; Transition effects
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Manager
APA (6th Edition):
Zhang, Y. (. (2019). Smart Water Meters in Full-scale Drinking Water Distribution Networks (DWDNs). (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:c1b7e03d-85c1-435b-9397-b3babedaee50
Chicago Manual of Style (16th Edition):
Zhang, Yingfei (author). “Smart Water Meters in Full-scale Drinking Water Distribution Networks (DWDNs).” 2019. Masters Thesis, Delft University of Technology. Accessed March 06, 2021.
http://resolver.tudelft.nl/uuid:c1b7e03d-85c1-435b-9397-b3babedaee50.
MLA Handbook (7th Edition):
Zhang, Yingfei (author). “Smart Water Meters in Full-scale Drinking Water Distribution Networks (DWDNs).” 2019. Web. 06 Mar 2021.
Vancouver:
Zhang Y(. Smart Water Meters in Full-scale Drinking Water Distribution Networks (DWDNs). [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Mar 06].
Available from: http://resolver.tudelft.nl/uuid:c1b7e03d-85c1-435b-9397-b3babedaee50.
Council of Science Editors:
Zhang Y(. Smart Water Meters in Full-scale Drinking Water Distribution Networks (DWDNs). [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:c1b7e03d-85c1-435b-9397-b3babedaee50
University of Waterloo
11.
Ganjidoost, Hadi.
Integrated Asset Management Framework and Model for Water Distribution Networks.
Degree: 2020, University of Waterloo
URL: http://hdl.handle.net/10012/15949
► The Canadian Infrastructure Report Card (2012) estimates the replacement value of water assets to be $362 billion. Water distribution and wastewater collection networks have been…
(more)
▼ The Canadian Infrastructure Report Card (2012) estimates the replacement value of water assets to be $362 billion. Water distribution and wastewater collection networks have been in service for more than a century in the majority of the cities in Canada. Although “out of sight” infrastructure might often be “out of mind”, the functionality of these city arteries greatly influences public health. Lack of effective maintenance and proactive renewal plans increase the incurred costs of water infrastructure systems drastically until affordable water fees cannot cover them. The Sustainable Water and Sewage System Act (MEO, 2002) followed by the Water Opportunities and Water Conservation Act (MEO, 2010), both encourage public utilities to develop financially sustainable plans for water and wastewater systems. In addition, both Ontario Regulation 453/07 (MEO, 2007) and Public Sector Accounting Board (PSAB) Statement 3150 (CICA, 2007) require all public water utilities to prepare annual reports on the current and the future condition of their in-service assets. Managing aging water infrastructure systems with limited financial resources requires comprehensive asset management plans that help decision-makers minimize the total life-cycle cost of their assets while enhancing levels of service. A viable asset management plan should incorporate a Strategic plan (10+year), to set the policies and strategies; Tactical plan (2-10 years), to develop capital programs; and Operational plan (1-2 years), to establish capital projects. Effective dynamic communication among planning levels is critical to share and exchange information and, thus, promote alignment of their respective objectives.
This research develops an Integrated Water Infrastructure Asset Management (IWIAM) model comprised of strategic, tactical and operational plans to (1) align corresponding objectives; (2) share and exchange their information; and (3) optimize the allocation of financial resources.
A novel hybrid Agent-Based and System Dynamics (AB-SD) modelling approach is employed to develop an IWIAM for water distribution networks. The SD and AB models are used to understand the complex dynamic behaviour of water infrastructure systems for network-level (i.e., strategic) and component-level (i.e., tactical-operational), respectively. A four-step Plan-Do-Check-Adjust (PDCA) iterative management process, along with an integrated Water Infrastructure Database (WIDB) is utilized to provide effective interaction and communication among all three planning levels. The research applies a bi-level heuristic optimization algorithm to find optimal solutions to group renewal activities in the development of capital programs.
The proposed research makes several noteworthy contributions to the body of knowledge for water distribution networks:
(1) The development of an integrated decision-support system using Agent-Based and System Dynamics methods to aid water decision-makers in asset management planning;
(2) The development of a platform for interactions between the…
Subjects/Keywords: asset management; agent-based modelling; system dynamics; water distribution network; decision support system; water infrastructure
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APA ·
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Manager
APA (6th Edition):
Ganjidoost, H. (2020). Integrated Asset Management Framework and Model for Water Distribution Networks. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/15949
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ganjidoost, Hadi. “Integrated Asset Management Framework and Model for Water Distribution Networks.” 2020. Thesis, University of Waterloo. Accessed March 06, 2021.
http://hdl.handle.net/10012/15949.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ganjidoost, Hadi. “Integrated Asset Management Framework and Model for Water Distribution Networks.” 2020. Web. 06 Mar 2021.
Vancouver:
Ganjidoost H. Integrated Asset Management Framework and Model for Water Distribution Networks. [Internet] [Thesis]. University of Waterloo; 2020. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/10012/15949.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ganjidoost H. Integrated Asset Management Framework and Model for Water Distribution Networks. [Thesis]. University of Waterloo; 2020. Available from: http://hdl.handle.net/10012/15949
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Alberta
12.
Liu, Megan J.
Wall Decay Coefficient of Combined Chlorine in a Drinking
Water Distribution System.
Degree: MS, Department of Civil and Environmental
Engineering, 2013, University of Alberta
URL: https://era.library.ualberta.ca/files/w9505091b
► Using water quality models to predict disinfectant concentrations in water distribution systems requires a knowledge of the wall decay coefficient. In this study, field water…
(more)
▼ Using water quality models to predict disinfectant
concentrations in water distribution systems requires a knowledge
of the wall decay coefficient. In this study, field water sampling
was conducted in conjunction with a SynerGEE Water hydraulic model
for an area of the water distribution system of the City of
Edmonton to calibrate a wall decay coefficient for combined
chlorine. Using the least squares method, a unique wall decay
coefficient, 0.0295 m/d, was obtained. Using the same method it was
found that the wall decay coefficient was 0.0455 m/d for a
sub-section of the studied area with predominately cast iron pipes,
and 0.0160 m/d for another sub-section where the pipes had been
extensively renewed. By identifying wall decay coefficients for
individual areas using this method, it is feasible to turn SynerGEE
Water hydraulic model into a working model to predict water quality
for the City of Edmonton.
Subjects/Keywords: SynerGEE Water; Wall Decay; Water Distribution System; Bulk Decay; Water Quality Modeling; Combined Chlorine; Chloramine
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APA ·
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Manager
APA (6th Edition):
Liu, M. J. (2013). Wall Decay Coefficient of Combined Chlorine in a Drinking
Water Distribution System. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/w9505091b
Chicago Manual of Style (16th Edition):
Liu, Megan J. “Wall Decay Coefficient of Combined Chlorine in a Drinking
Water Distribution System.” 2013. Masters Thesis, University of Alberta. Accessed March 06, 2021.
https://era.library.ualberta.ca/files/w9505091b.
MLA Handbook (7th Edition):
Liu, Megan J. “Wall Decay Coefficient of Combined Chlorine in a Drinking
Water Distribution System.” 2013. Web. 06 Mar 2021.
Vancouver:
Liu MJ. Wall Decay Coefficient of Combined Chlorine in a Drinking
Water Distribution System. [Internet] [Masters thesis]. University of Alberta; 2013. [cited 2021 Mar 06].
Available from: https://era.library.ualberta.ca/files/w9505091b.
Council of Science Editors:
Liu MJ. Wall Decay Coefficient of Combined Chlorine in a Drinking
Water Distribution System. [Masters Thesis]. University of Alberta; 2013. Available from: https://era.library.ualberta.ca/files/w9505091b
Addis Ababa University
13.
CHALI DEREJE, DEREJE.
MODEL BASED WATER SUPPLY NETWORK ASSESSMENT: CASE OF GEFERSA SUPPLY SYSTEM
.
Degree: 2014, Addis Ababa University
URL: http://etd.aau.edu.et/dspace/handle/123456789/4308
► Water distribution systems are designed to fulfill all requirements of potable water needed for decades. Initial system designs frequently consider any anticipated changes likely to…
(more)
▼ Water distribution systems are designed to fulfill all requirements of potable
water needed for
decades. Initial
system designs frequently consider any anticipated changes likely to happen.
However, as time elapsed they slowly begin to fail to satisfy customers’ requirements; both in
quantity and quality. The wonder is to identify factors which bring those changes and propose viable
solutions to improve the situation. To this effect modeling
water distribution network
system is very
helpful. In this study, Addis Ababa
Water distribution system for case study of Gefersa supply
system was assessed. EPANET software was used as tool to model
water distribution system. The
modeling effort included both hydraulic and
water quality modeling. Simulation results for
maximum and minimum pressures were used as base to evaluate the hydraulic performance; and
simulation result for
water age and minimum residual chlorine were used as base to assess
water
quality transformation in
distribution system. Modeling results showed violation of maximum and
minimum pressure requirements. Along with this,
water quality simulation results illustrated
water
quality deterioration due to availability of minimum residual chlorine which is below WHO
guideline. To retrieve the situation there is a need to intervene. Modifications in operation and
design will improve the current situation of the case study
water distribution system.
Advisors/Committee Members: AGIZEW NIGUSSIE (PH.D) (advisor).
Subjects/Keywords: Water distribution system;
modeling, Hydraulic performance;
Water quality;
Maximum pressure;
Minimum pressure;
Water age
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Manager
APA (6th Edition):
CHALI DEREJE, D. (2014). MODEL BASED WATER SUPPLY NETWORK ASSESSMENT: CASE OF GEFERSA SUPPLY SYSTEM
. (Thesis). Addis Ababa University. Retrieved from http://etd.aau.edu.et/dspace/handle/123456789/4308
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
CHALI DEREJE, DEREJE. “MODEL BASED WATER SUPPLY NETWORK ASSESSMENT: CASE OF GEFERSA SUPPLY SYSTEM
.” 2014. Thesis, Addis Ababa University. Accessed March 06, 2021.
http://etd.aau.edu.et/dspace/handle/123456789/4308.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
CHALI DEREJE, DEREJE. “MODEL BASED WATER SUPPLY NETWORK ASSESSMENT: CASE OF GEFERSA SUPPLY SYSTEM
.” 2014. Web. 06 Mar 2021.
Vancouver:
CHALI DEREJE D. MODEL BASED WATER SUPPLY NETWORK ASSESSMENT: CASE OF GEFERSA SUPPLY SYSTEM
. [Internet] [Thesis]. Addis Ababa University; 2014. [cited 2021 Mar 06].
Available from: http://etd.aau.edu.et/dspace/handle/123456789/4308.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
CHALI DEREJE D. MODEL BASED WATER SUPPLY NETWORK ASSESSMENT: CASE OF GEFERSA SUPPLY SYSTEM
. [Thesis]. Addis Ababa University; 2014. Available from: http://etd.aau.edu.et/dspace/handle/123456789/4308
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
14.
Fang, Jiaxing (author).
The Study of Potential Transition Effects on Water Quality During Distribution by Smart Water Meters (SWMs).
Degree: 2018, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:d404d6f8-38e0-43bb-8649-5f1cc91c61cb
► Driven by the fast development of water purification technologies, tightening of water quality regulations and the increasing public concern on water-related health problems, drinking water…
(more)
▼ Driven by the fast development of
water purification technologies, tightening of
water quality regulations and the increasing public concern on
water-related health problems, drinking
water companies have spared no efforts on treatment processes upgradation as well as striving on maintenance aspects. In the event of perturbation such as supply-
water change in this study, historically harbored materials in drinking
water distribution systems (DWDS), can potentially be converted into suspended materials and consequently delivered to end users, leading to a reduction on hygienic
water quality. In order to capture the potential occurrence of transition effects in a research area and figure out the impact as well as trace back its potential origination, Smart
Water Meter is designed and developed with the integrated functions of on-line monitoring, sampling and real-time data communication detect and monitor potentially occurred physiochemical and microbiological
water quality deterioration during supply-
water change period. The improved Smart
Water Meter consists of pressure sensors, temperature sensors, filter bag with 50-micron pore size, a normal
water meter and a monitor box. Meanwhile, 3 batch of pipes sampling and 2 batch of filter bags sampling were carried out in time series to analysis and confirm the development and behavior of transition effect. The results showed that new supplied
water with low nutrients and particle load in the research area has triggered the occurrence of transition effects while the improved Smart
Water Meters are capable to well capture the destabilized
distribution network harbored materials (DNHM) in DWDS and prevent undesirable large particulate matter from reaching the consumers’. Besides, the triggered transition effect in this case was not violate and the temporal tendency of the microbiological and elemental parameters indicated the gradual settle-down of the transition effect. The cross comparison between the elements structure from pipe samples and filter bags, Ca and Fe are the dominate compounds in filtrates and indicates the destabilized DNHM could probably originated from detached biofilm and resuspended loose deposits since they the hotspots for calcium and iron respectively.
Advisors/Committee Members: van der Hoek, Jan Peter (mentor), Liu, Gang (mentor), Abraham, Edo (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: Smart Water Meter; supply-water change; drinking water distribution system; transition effect
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Manager
APA (6th Edition):
Fang, J. (. (2018). The Study of Potential Transition Effects on Water Quality During Distribution by Smart Water Meters (SWMs). (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:d404d6f8-38e0-43bb-8649-5f1cc91c61cb
Chicago Manual of Style (16th Edition):
Fang, Jiaxing (author). “The Study of Potential Transition Effects on Water Quality During Distribution by Smart Water Meters (SWMs).” 2018. Masters Thesis, Delft University of Technology. Accessed March 06, 2021.
http://resolver.tudelft.nl/uuid:d404d6f8-38e0-43bb-8649-5f1cc91c61cb.
MLA Handbook (7th Edition):
Fang, Jiaxing (author). “The Study of Potential Transition Effects on Water Quality During Distribution by Smart Water Meters (SWMs).” 2018. Web. 06 Mar 2021.
Vancouver:
Fang J(. The Study of Potential Transition Effects on Water Quality During Distribution by Smart Water Meters (SWMs). [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Mar 06].
Available from: http://resolver.tudelft.nl/uuid:d404d6f8-38e0-43bb-8649-5f1cc91c61cb.
Council of Science Editors:
Fang J(. The Study of Potential Transition Effects on Water Quality During Distribution by Smart Water Meters (SWMs). [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:d404d6f8-38e0-43bb-8649-5f1cc91c61cb
Univerzitet u Beogradu
15.
Babić, Branislav. 1962-.
Унапређење методологије за вредновање и побољшање
перформанси водоводних система.
Degree: Građevinski fakultet, 2015, Univerzitet u Beogradu
URL: https://fedorabg.bg.ac.rs/fedora/get/o:9270/bdef:Content/get
► Грађевинарство-Комунално и санитарно инжењерство / Civil Engineering-Sanitary Engineering
За потребе вредновања перформанси водоводних система Међународна асоцијација за воде је 2006. године предложила основну методологију поделе…
(more)
▼ Грађевинарство-Комунално и санитарно инжењерство /
Civil Engineering-Sanitary Engineering
За потребе вредновања перформанси водоводних
система Међународна асоцијација за воде је 2006. године предложила
основну методологију поделе водног биланса на компоненете потрошње
воде и губитака воде, и препоручила примену низа показатеља рада
водоводних система као средства за квантификацију и поређење
перформанси водоводних система, по различитим параметрима. Ова
методологија се базира на подацима о појединим компонентама водног
биланса, физичким карактеристикама система и показатељима пословања
водоводског предузећа. Од почетка примене ове методологије, као
основни проблем у примени показала се неодређеност улазних
података, која се у даљим прорачунима пропагира на израчунате
вредности компоненти водног биланса и индикаторе перформанси
система (ИП). Подаци велике неодређености могу да наведу на
погрешне закључке и самим тим доведу до погрешних управљачких
одлука. У дисертацији је развијена метода, заснована на ISO
методологији, за процену неодређености улазних података о
водоводном систему и пропагације неодређености на ИП водоводних
дистрибутивних система. Анализа грешака и неодређености обухвата
проучавање и квантификовање неодређености, као и мере које треба
предузети за њено минимизирање. У складу са тим, у дисертацији су
дефинисане и активности које је потребно предузети како би се
смањила неодређеност компоненти водног биланса и одговарајућих ИП.
Метода је успешно примењена на примеру водоводног дистрибутивног
система града Пожаревца. Приказано је како спроведене активности
утичу на смањење неодређености улазних параметара на основу којих
се рачунају компоненте водног биланса и ИП и самим тим утичу на
повећање њихове поузданости. У компонентама биланса воде, значајну
неодређеност има компонента привидних губитака воде (вода коју су
корисници водовода утрошили али која није
обрачуната)...
Advisors/Committee Members: Ljubisavljević, Dejan. 1950-.
Subjects/Keywords: water distribution system; water losses; water
consumption; minimum night flow; leakage; pressure; performance
indicators
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APA (6th Edition):
Babić, B. 1. (2015). Унапређење методологије за вредновање и побољшање
перформанси водоводних система. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:9270/bdef:Content/get
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Babić, Branislav 1962-. “Унапређење методологије за вредновање и побољшање
перформанси водоводних система.” 2015. Thesis, Univerzitet u Beogradu. Accessed March 06, 2021.
https://fedorabg.bg.ac.rs/fedora/get/o:9270/bdef:Content/get.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Babić, Branislav 1962-. “Унапређење методологије за вредновање и побољшање
перформанси водоводних система.” 2015. Web. 06 Mar 2021.
Vancouver:
Babić B1. Унапређење методологије за вредновање и побољшање
перформанси водоводних система. [Internet] [Thesis]. Univerzitet u Beogradu; 2015. [cited 2021 Mar 06].
Available from: https://fedorabg.bg.ac.rs/fedora/get/o:9270/bdef:Content/get.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Babić B1. Унапређење методологије за вредновање и побољшање
перформанси водоводних система. [Thesis]. Univerzitet u Beogradu; 2015. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:9270/bdef:Content/get
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of New Mexico
16.
Linger, Steve P.
Spatial-temporal neighborhood-scale urban water demand estimation.
Degree: Geography, 2011, University of New Mexico
URL: http://hdl.handle.net/1928/12805
► Water distribution systems are one of the vital infrastructures within the urban environment. The urban population is highly dependent on a reliable, clean, safe, and…
(more)
▼ Water distribution systems are one of the vital infrastructures within the urban environment. The urban population is highly dependent on a reliable, clean, safe, and affordable supply of drinking
water. Understanding and characterizing the demand for
water on municipal
water distribution systems is critical for managing this resource. A reasonable estimate of
water demand for a municipal
system would provide meaningful characterization and potentially enable defensible hydraulic analyses of that
system. Much of the previous research and methods on estimating demand required detailed
system data to estimate demand at coarser spatial and temporal resolutions for a specific
system. The objective of this research, in contrast, is to develop a method to estimate
water demand at high spatial (e.g., neighborhood-scale) and temporal (e.g., one-hour) resolutions for any municipal
water distribution system in the U.S. using publically available data. The demand estimation method was implemented as an ArcGIS ArcMap extension. The proposed demand estimation methodology was applied to a real municipal
system in the U.S. A
distribution pipeline network and demand model for the City of Santa Fe, New Mexico master plan was used to assess the performance of the research method. The method was first calibrated using the extent of the pipeline network within one pressure zone of the
water system. The calibrated method was then validated using different, independent pressure zones within the
water system. The results indicate that the estimate of
water demand using the initial, default parameter values produced a relative error which was within the typical variance between an average day and a peak day for a municipal
system. The best-fit validation case produced a demand estimate with a relative error for the entire Santa Fe
system which was shown to be within the smaller tolerance of error required for hydraulic analyses for engineering studies. This suggests that the demand estimates produced, based on the best-fit validation case, are more likely to be defensible for hydraulic studies. Lastly, the validated model was applied to estimate the change in
water demand from 2008 to 2020 under different
water-conservation policies for the Santa Fe municipal
system. Applying the validated method to a real-world issue showed that the estimated demands on the Santa Fe
system for year 2020 could be nearly offset by enacting
water conservation policy.
Advisors/Committee Members: Zandbergen, Paul, Zandbergen, Paul, Matthews, Olen Paul, McPherson, Timothy.
Subjects/Keywords: Water Demand; Spatial Temporal; Water Distribution System; GIS; Demand Estimation; Urban Infrastructure; Water Resources
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APA ·
Chicago ·
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APA (6th Edition):
Linger, S. P. (2011). Spatial-temporal neighborhood-scale urban water demand estimation. (Masters Thesis). University of New Mexico. Retrieved from http://hdl.handle.net/1928/12805
Chicago Manual of Style (16th Edition):
Linger, Steve P. “Spatial-temporal neighborhood-scale urban water demand estimation.” 2011. Masters Thesis, University of New Mexico. Accessed March 06, 2021.
http://hdl.handle.net/1928/12805.
MLA Handbook (7th Edition):
Linger, Steve P. “Spatial-temporal neighborhood-scale urban water demand estimation.” 2011. Web. 06 Mar 2021.
Vancouver:
Linger SP. Spatial-temporal neighborhood-scale urban water demand estimation. [Internet] [Masters thesis]. University of New Mexico; 2011. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/1928/12805.
Council of Science Editors:
Linger SP. Spatial-temporal neighborhood-scale urban water demand estimation. [Masters Thesis]. University of New Mexico; 2011. Available from: http://hdl.handle.net/1928/12805
University of California – Berkeley
17.
Kumpel, Emily Katherine.
Water Quality and Quantity in Intermittent and Continuous Piped Water Supplies in Hubli-Dharwad, India.
Degree: Civil and Environmental Engineering, 2013, University of California – Berkeley
URL: http://www.escholarship.org/uc/item/0br51246
► In at least 45 low- and middle-income countries, piped water systems deliver water for limited durations. Few data are available of the impact of intermittent…
(more)
▼ In at least 45 low- and middle-income countries, piped water systems deliver water for limited durations. Few data are available of the impact of intermittent water supply (IWS) on the water quality and quantity delivered to households. This thesis examines the impact of intermittently supplied piped water on the quality and quantity of water delivered to residential taps in Hubli-Dharwad, India, when compared to continuous piped water supply. A framework for understanding the pathways through which IWS can impact water quality is first developed. The extent to which contamination occurs in Hubli-Dharwad is quantified by comparing microbial water quality throughout the distribution system in an intermittent system and a continuous system in the same city. The mechanisms affecting water quality in the IWS network in Hubli-Dharwad are identified by measuring changes in water quality over time using continuous measurements from pressure and physico-chemical sensors paired with grab samples tested for indicator bacteria. In the final chapter, a new method of measuring household water consumption in an IWS when supply durations are limited and few metered data are available is developed. This thesis showed that the intermittent supply was frequently subject to contamination in the distribution system and that households with intermittent supply consumed limited quantities of water. While these results demonstrated that converting to a continuous water supply can improve water quality when compared to intermittent supply, this conversion may not be possible in the near future for resource-constrained towns and cities. This thesis contributes to knowledge of the mechanisms causing contamination and constricting water access in IWS systems, which can help improve systems to ensure that people with piped water receive water that is reliable, safe, and sufficient.
Subjects/Keywords: Environmental engineering; Civil engineering; 24/7 water supply; household water consumption; intermittent water supply; water distribution system; water quality
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APA ·
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MLA ·
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to Zotero / EndNote / Reference
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APA (6th Edition):
Kumpel, E. K. (2013). Water Quality and Quantity in Intermittent and Continuous Piped Water Supplies in Hubli-Dharwad, India. (Thesis). University of California – Berkeley. Retrieved from http://www.escholarship.org/uc/item/0br51246
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kumpel, Emily Katherine. “Water Quality and Quantity in Intermittent and Continuous Piped Water Supplies in Hubli-Dharwad, India.” 2013. Thesis, University of California – Berkeley. Accessed March 06, 2021.
http://www.escholarship.org/uc/item/0br51246.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kumpel, Emily Katherine. “Water Quality and Quantity in Intermittent and Continuous Piped Water Supplies in Hubli-Dharwad, India.” 2013. Web. 06 Mar 2021.
Vancouver:
Kumpel EK. Water Quality and Quantity in Intermittent and Continuous Piped Water Supplies in Hubli-Dharwad, India. [Internet] [Thesis]. University of California – Berkeley; 2013. [cited 2021 Mar 06].
Available from: http://www.escholarship.org/uc/item/0br51246.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kumpel EK. Water Quality and Quantity in Intermittent and Continuous Piped Water Supplies in Hubli-Dharwad, India. [Thesis]. University of California – Berkeley; 2013. Available from: http://www.escholarship.org/uc/item/0br51246
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Anna University
18.
Paul, Pratheeba.
Optimization for maintenance of water distribution system
using stochastic search algorithms.
Degree: Civil Engineering, 2013, Anna University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/10082
► Water distribution systems are complex interconnected networks consisting of pipes, junction joints and pumps that require extensive planning to ensure that water is delivered to…
(more)
▼ Water distribution systems are complex
interconnected networks consisting of pipes, junction joints and
pumps that require extensive planning to ensure that water is
delivered to the consumers without service interruptions. All water
distribution systems deteriorate over time. It is not economically
viable to replace all deteriorating pipelines in old water
distribution systems. Therefore maintenance is essential to improve
the service level and maximize the reliability of aging water
distribution systems. The objective of this study is to propose a
maintenance decision model to obtain a near-optimal maintenance
strategy that minimizes the total discounted maintenance cost over
a defined planning horizon subject to the water distribution system
availability constraint. Various maintenance alternatives like
replacement and rehabilitation of water distribution pipe network
are considered in the study. The cost terms which are relevant to
the maintenance problem under study are described by a set of non
linear equations. Stochastic Search Algorithms have created an
immense interest among researchers to solve this type of complex
combinatorial optimization problems. In this study, the application
of stochastic search algorithms such as Simulated Annealing
technique, Tabu Search approach and Genetic Algorithms, to solve
the water distribution system maintenance optimization problem is
demonstrated. The study considers a real-life water distribution
system in Chennai, India. A systematic failure study of the pipe
network together with the pumping system components to identify the
potential failure modes of the water distribution system is carried
out. A Monte Carlo simulation approach is used to assess the
infrastructure availability of the water distribution system. The
results obtained from the present study provide insights into the
working of the proposed stochastic search algorithms and their
application to solve water distribution system maintenance
problems.
References p. 148-166, List of publications p.
167
Advisors/Committee Members: Ambujam N K.
Subjects/Keywords: Water distribution system; Stochastic Search Algorithms; Civil Engineering
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APA ·
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Manager
APA (6th Edition):
Paul, P. (2013). Optimization for maintenance of water distribution system
using stochastic search algorithms. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/10082
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Paul, Pratheeba. “Optimization for maintenance of water distribution system
using stochastic search algorithms.” 2013. Thesis, Anna University. Accessed March 06, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/10082.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Paul, Pratheeba. “Optimization for maintenance of water distribution system
using stochastic search algorithms.” 2013. Web. 06 Mar 2021.
Vancouver:
Paul P. Optimization for maintenance of water distribution system
using stochastic search algorithms. [Internet] [Thesis]. Anna University; 2013. [cited 2021 Mar 06].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/10082.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Paul P. Optimization for maintenance of water distribution system
using stochastic search algorithms. [Thesis]. Anna University; 2013. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/10082
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Addis Ababa University
19.
Selamawit, Mulugeta.
ASSESSMENT OF DRINKING WATER QUALITY IN MERCATO, ADDIS ABABA
.
Degree: 2012, Addis Ababa University
URL: http://etd.aau.edu.et/dspace/handle/123456789/5942
► While water is released from treatment plant for consumption purpose it does not embrace anything harmful and objectionable to human health. But due to the…
(more)
▼ While water is released from treatment plant for consumption purpose it does not embrace
anything harmful and objectionable to human health. But due to the complex interaction of the
distribution system with the environment quality of water may deteriorate. Bearing this in mind in the
previous year’s water quality assessment at different place within the distribution system was not the
basic concern for many water sectors. Nowadays even though there are no documented and well
organized studies about it water sectors know the above problem and its intended results.
The study was conducted in Mercato, Addis Ababa which is the largest market place in the
country. Since the study area is very slum, crowded and serves as center for commercial activity the
residents are forced to lead their day to day life activity in a small place. This phenomenon forced the
dwellers to live in offensive environment. As an indication without considering the amount of waste
failed to reach to the collection containers, from the total amount of waste collected in the sub-city only
74% is properly removed. The reaming was left to join rivers, streets, ditches and open spaces which
facilitate health troubles and environmental disturbance.
In such living environment to maintain the health status of dwellers by having appropriate information
on the level of safety of water regular examination of water quality for the presence of photogenic
organisms, chemicals and physical parameters is mandatory.
Investigation under this study indicates the presence of significant level of water quality deterioration
and existence of pathogens at consumers tap. For water quality assessment water samples were taken
from treatment-plant, reservoirs, and consumer taps.
Subjects/Keywords: Tap Water quality;
Distribution system;
Waterborne disease;
Mercato
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APA (6th Edition):
Selamawit, M. (2012). ASSESSMENT OF DRINKING WATER QUALITY IN MERCATO, ADDIS ABABA
. (Thesis). Addis Ababa University. Retrieved from http://etd.aau.edu.et/dspace/handle/123456789/5942
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Selamawit, Mulugeta. “ASSESSMENT OF DRINKING WATER QUALITY IN MERCATO, ADDIS ABABA
.” 2012. Thesis, Addis Ababa University. Accessed March 06, 2021.
http://etd.aau.edu.et/dspace/handle/123456789/5942.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Selamawit, Mulugeta. “ASSESSMENT OF DRINKING WATER QUALITY IN MERCATO, ADDIS ABABA
.” 2012. Web. 06 Mar 2021.
Vancouver:
Selamawit M. ASSESSMENT OF DRINKING WATER QUALITY IN MERCATO, ADDIS ABABA
. [Internet] [Thesis]. Addis Ababa University; 2012. [cited 2021 Mar 06].
Available from: http://etd.aau.edu.et/dspace/handle/123456789/5942.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Selamawit M. ASSESSMENT OF DRINKING WATER QUALITY IN MERCATO, ADDIS ABABA
. [Thesis]. Addis Ababa University; 2012. Available from: http://etd.aau.edu.et/dspace/handle/123456789/5942
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Toronto
20.
Keung, Chris.
Re-evaluating Secondary Disinfectants as Sentinels of Contamination and Using a Systems Vulnerability Model.
Degree: 2015, University of Toronto
URL: http://hdl.handle.net/1807/70423
► To build a framework in which secondary disinfectants can be quantitatively evaluated, three tasks were performed: (1) A sampling campaign was conducted at a community…
(more)
▼ To build a framework in which secondary disinfectants can be quantitatively evaluated, three tasks were performed: (1) A sampling campaign was conducted at a community using an alternative secondary disinfectant (HuwaSan peroxide) to evaluate various water quality parameters; (2) bench-scale experiments examined the efficacy of different disinfectants as sentinels of contamination; and (3) a systems vulnerability assessment was performed (EPANET-MSX). The results show that: (1) HuwaSan, can limit DBP formation while maintaining acceptable water quality in terms of the parameters measured; (2) chlorine was observed to be the most appropriate sentinel of intrusion under the tested conditions; and (3) under modeled conditions, E. coli propagation was controlled by all tested disinfectants. For Giardia intrusions, Cl2, ClO2, and HSP achieved 3-log inactivation between 30-150 minutes, although an assumed inactivation rate for HSP was used. The same inactivation required chloramines and H2O2 between 330-1180 and 170-910 minutes, respectively.
M.A.S.
Advisors/Committee Members: Hofmann, Ron, Civil Engineering.
Subjects/Keywords: Distribution System; Drinking Water; Secondary Disinfectants; Secondary Disinfection; 0543
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APA ·
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APA (6th Edition):
Keung, C. (2015). Re-evaluating Secondary Disinfectants as Sentinels of Contamination and Using a Systems Vulnerability Model. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/70423
Chicago Manual of Style (16th Edition):
Keung, Chris. “Re-evaluating Secondary Disinfectants as Sentinels of Contamination and Using a Systems Vulnerability Model.” 2015. Masters Thesis, University of Toronto. Accessed March 06, 2021.
http://hdl.handle.net/1807/70423.
MLA Handbook (7th Edition):
Keung, Chris. “Re-evaluating Secondary Disinfectants as Sentinels of Contamination and Using a Systems Vulnerability Model.” 2015. Web. 06 Mar 2021.
Vancouver:
Keung C. Re-evaluating Secondary Disinfectants as Sentinels of Contamination and Using a Systems Vulnerability Model. [Internet] [Masters thesis]. University of Toronto; 2015. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/1807/70423.
Council of Science Editors:
Keung C. Re-evaluating Secondary Disinfectants as Sentinels of Contamination and Using a Systems Vulnerability Model. [Masters Thesis]. University of Toronto; 2015. Available from: http://hdl.handle.net/1807/70423
University of KwaZulu-Natal
21.
Ally, Ismaeel Haroon Tar.
Simulation tests for the operation of a water main with break pressure tanks.
Degree: 2016, University of KwaZulu-Natal
URL: http://hdl.handle.net/10413/14888
► The Ashley Drive break pressure tank (BPT-20 𝑀ℓ) has been installed on Durban’s Western Aqueduct. Its purpose is to release the 20 bar gravity head…
(more)
▼ The Ashley Drive break pressure tank (BPT-20 𝑀ℓ) has been installed on Durban’s Western Aqueduct. Its purpose is to release the 20 bar gravity head of the 1.4m trunk main supply from Umgeni
Water at Umlaas Road. The expected peak conditions (400 𝑀ℓ/𝑑𝑎𝑦) will only allow 14 minutes for valves to close, yet they must be moved slowly in order to avoid dynamic shock. The high pressure upstream supply is admitted to the BPT through a set of thee parallel sleeve valves, which are in a control loop to maintain level in the BPT against the downstream draw. These cavitation-resistant valves cannot be operated without electrical power, so an added complication of the design is a set of 3 hydraulically-operated globe valves which switch in at extreme tank levels.
Though the commissioning of the Ashley Drive BPT is already in progress, it is important to simulate the overall operation of the
system for projected future flows, in order to detect possible operational problems, and to build in solutions if necessary. Optimisations include such issues as the valve closing sequence and speeds, settling level variations, and smoothness of the draw from Umgeni
Water.
The simulation study involved the modelling of the trunk main, the Ashley Drive BPT, the downstream Wyebank BPT and the reservoirs drawing from the trunk main before and after these two BPTs. Data handling techniques were developed in order to formulate the daily demand profiles for each of the reservoirs. Design information was used to calculate the hydraulic parameters that featured in the simulation, and to determine the residual pressures at the inlet valve sets of the BPTs. Implicit calculations with the Newton-Raphson iterative method were employed in order to obtain a pressure
distribution across the BPT valves. Simple mechanisms were built into the MATLAB® program in order to accommodate the complexities of the
system, e.g. the possibility of power loss, valve or BPT chamber maintenance, or the deliberately slowed movement of the valves to avoid pressure surges within the pipeline.
The analysis of the results of the simulation study involved examining the efficacy of the control set-points and valve sequencing, and determining whether these settings satisfy the design specifications. Random and anticipated scenario testing was carried out within the study in order to accommodate for situations such as electricity outages or unusual consumer demands. The BPT control
system was analysed to assess its adequacy and the risks associated with the proposed staggered sleeve valve control scheme. The results of this investigation are presented as multiple time-sequence graphs depicting the results of the different scenario tests. Support for the design concept, additional recommendations and indications of adverse scenarios, have emerged from this study. The original design is found to be capable of duty within the ranges of expected normal operation in 2036, and the
system was observed to be capable of conveying a throughput greater than that of the design. The normal…
Advisors/Committee Members: Mulholland, Michael. (advisor), Buckley, Christopher Andrew. (advisor), McLeod, Neil. (advisor).
Subjects/Keywords: Theses - Chemical Engineering.; Water distribution system.; APANET.; Reservoir.
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APA ·
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Export
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Manager
APA (6th Edition):
Ally, I. H. T. (2016). Simulation tests for the operation of a water main with break pressure tanks. (Thesis). University of KwaZulu-Natal. Retrieved from http://hdl.handle.net/10413/14888
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ally, Ismaeel Haroon Tar. “Simulation tests for the operation of a water main with break pressure tanks.” 2016. Thesis, University of KwaZulu-Natal. Accessed March 06, 2021.
http://hdl.handle.net/10413/14888.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ally, Ismaeel Haroon Tar. “Simulation tests for the operation of a water main with break pressure tanks.” 2016. Web. 06 Mar 2021.
Vancouver:
Ally IHT. Simulation tests for the operation of a water main with break pressure tanks. [Internet] [Thesis]. University of KwaZulu-Natal; 2016. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/10413/14888.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ally IHT. Simulation tests for the operation of a water main with break pressure tanks. [Thesis]. University of KwaZulu-Natal; 2016. Available from: http://hdl.handle.net/10413/14888
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
North-West University
22.
Venter, Leandra.
Presence of potentially pathogenic heterotrophic plate count (HPC) bacteria occurring in a drinking water distribution system in the North-West Province, South Africa / by Leandra Venter
.
Degree: 2010, North-West University
URL: http://hdl.handle.net/10394/4380
► There is currently growing concern about the presence of heterotrophic plate count (HPC) bacteria in drinking water. These HPC may have potential pathogenic features, enabling…
(more)
▼ There is currently growing concern about the presence of heterotrophic plate count (HPC)
bacteria in drinking water. These HPC may have potential pathogenic features, enabling
them to cause disease. It is especially alarming amongst individuals with a weakened
immune system. South Africa, the country with the highest incidents of HIV positive
individuals in the world, mainly uses these counts to assess the quality of drinking water in
terms of the number of micro-organisms present in the water. These micro-organisms may
be present in the bulk water or as biofilms adhered to the surfaces of a drinking water
distribution system. The current study investigated the pathogenic potential of HPC bacteria
occurring as biofilms within a drinking water distribution system and determined the
possible presence of these micro-organims within the bulk water. Biofilm samples were
taken from five sites within a drinking water distribution system. Fifty six bacterial colonies
were selected based on morphotypes and isolated for the screening of potential pathogenic
features. Haemolysin production was tested for using sheep-blood agar plates. Of the 56,
31 isolates were ?-haemolytic. Among the 31 ?-haemolytic positive isolates 87.1% were
positive for lecithinase, 41.9% for proteinase, 19.4% for chondroitinase, 9.7% for DNase
and 6.5% for hyaluronidase. All of the ?-haemolytic isolates were resistant to
oxytetracycline 30 ?g, trimethoprim 2.5 ?g and penicillin G10 units, 96.8% were resistant to
vancomycin 30 ?g and ampicillin 10 ?g, 93.5% to kanamycin 30 ?g, 74.2% to
chloramphenicol 30 ?g, 54.8% to ciprofloxacin 5 ?g, 22.6% to streptomycin 300 ?g and
16.1% to erythromycin 15 ?g. Nineteen isolates producing two or more enzymes were
subjected to Gram staining. The nineteen isolates were all Gram-positive. These isolates
were then identified using the BD BBL CRYSTALTM Gram-positive (GP) identification (ID)
system. Isolates were identified as Bacillus cereus, Bacillus licheniformis, Bacillus subtilis,
Bacillus megaterium, Bacillus pumilus and Kocuria rosea. 16S rRNA gene sequencing was
performed to confirm these results and to obtain identifications for the bacteria not identified
with the BD BBL CRYSTALTM GP ID system. Additionally identified bacteria included
Bacillus thuringiensis, Arthrobacter oxydans and Exiguobacterium acetylicum.
Morphological properties of the different species were studied with transmission electron
microscopy (TEM) to confirm sequencing results. All the isolates displayed rod shaped cells
with the exception of Arthrobacter oxydans being spherical in the stationary phase of their life cycle. Bulk water samples were taken at two sites in close proximity with the biofilm
sampling sites. The DNA was extracted directly from the water samples and the 16S rRNA
gene region was amplified. Denaturing gradient gel electrophoresis (DGGE) was performed
to confirm the presence of the isolates from the biofilm samples in the bulk water samples.
The presence of Bacillus pumilus and Arthrobacter oxydans could be confirmed with…
Subjects/Keywords: Biofilms;
HPC;
Drinking water distribution system;
DGGE;
Denaturing gradient gel electrophoresis
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APA (6th Edition):
Venter, L. (2010). Presence of potentially pathogenic heterotrophic plate count (HPC) bacteria occurring in a drinking water distribution system in the North-West Province, South Africa / by Leandra Venter
. (Thesis). North-West University. Retrieved from http://hdl.handle.net/10394/4380
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Venter, Leandra. “Presence of potentially pathogenic heterotrophic plate count (HPC) bacteria occurring in a drinking water distribution system in the North-West Province, South Africa / by Leandra Venter
.” 2010. Thesis, North-West University. Accessed March 06, 2021.
http://hdl.handle.net/10394/4380.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Venter, Leandra. “Presence of potentially pathogenic heterotrophic plate count (HPC) bacteria occurring in a drinking water distribution system in the North-West Province, South Africa / by Leandra Venter
.” 2010. Web. 06 Mar 2021.
Vancouver:
Venter L. Presence of potentially pathogenic heterotrophic plate count (HPC) bacteria occurring in a drinking water distribution system in the North-West Province, South Africa / by Leandra Venter
. [Internet] [Thesis]. North-West University; 2010. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/10394/4380.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Venter L. Presence of potentially pathogenic heterotrophic plate count (HPC) bacteria occurring in a drinking water distribution system in the North-West Province, South Africa / by Leandra Venter
. [Thesis]. North-West University; 2010. Available from: http://hdl.handle.net/10394/4380
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universitat Politècnica de València
23.
Ramos Martínez, Eva.
Assessing biofilm development in drinking water distribution systems by Machine Learning methods
.
Degree: 2016, Universitat Politècnica de València
URL: http://hdl.handle.net/10251/63257
► [EN] One of the main challenges of drinking water utilities is to ensure high quality supply, in particular, in chemical and microbiological terms. However, biofilms…
(more)
▼ [EN] One of the main challenges of drinking
water utilities is to ensure high quality supply, in particular, in chemical and microbiological terms. However, biofilms invariably develop in all drinking
water distribution systems (DWDSs), despite the presence of residual disinfectant. As a result,
water utilities are not able to ensure total bacteriological control. Currently biofilms represent a real paradigm in
water quality management for all DWDSs. Biofilms are complex communities of microorganisms bound by an extracellular polymer that provides them with structure, protection from toxics and helps retain food. Besides the health risk that biofilms involve, due to their role as a pathogen shelter, a number of additional problems associated with biofilm development in DWDSs can be identified. Among others, aesthetic deterioration of
water, biocorrosion and disinfectant decay are universally recognized. A large amount of research has been conducted on this field since the earliest 80's. However, due to the complex environment and the community studied most of the studies have been developed under certain simplifications.
We resort to this already done work and acquired knowledge on biofilm growth in DWDSs to change the common approaches of these studies. Our proposal is based on arduous preprocessing and posterior analysis by Machine Learning approaches. A multi-disciplinary procedure is undertaken, helping as a practical approach to develop a decision-making tool to help DWDS management to maintain, as much as possible, biofilm at the lowest level, and mitigating its negative effects on the service. A methodology to detect the more susceptible areas to biofilm development in DWDSs is proposed. Knowing the location of these hot-spots of the network, mitigation actions could be focused more specifically, thus saving resources and money. Also, prevention programs could be developed, acting before the consequences of biofilm are noticed by the consumers. In this way, the economic cost would be reduced and the service quality would improve, eventually increasing consumers' satisfaction.; [ES] Uno de los principales objetivos de las empresas encargadas de la gestión de los sistemas de distribución de agua potable (DWDSs, del inglés Drinking
Water Distribution Systems) es asegurar una alta calidad del agua en su abastecimiento, tanto química como microbiológica. Sin embargo, la existencia de biofilms en todos ellos, a pesar de la presencia de desinfectante residual, hace que no se pueda asegurar un control bacteriológico total, por lo que, hoy en día, los biofilms representan un paradigma en la gestión de la calidad del agua en los DWDSs. Los biofilms son comunidades complejas de microorganismos recubiertas de un polímero extracelular que les da estructura y les ayuda a retener el alimento y a protegerse de agentes tóxicos. Además del riesgo sanitario que suponen por su papel como refugio de patógenos, existen muchos otros problemas asociados al desarrollo de biofilms en los DWDSs, como deterioro estético del agua,…
Advisors/Committee Members: Herrera Fernández, Antonio Manuel (advisor), Izquierdo Sebastián, Joaquín (advisor), Pérez García, Rafael (advisor).
Subjects/Keywords: Biofilm; drinking water distribution system; pre-processing; machine learning; random forest
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APA ·
Chicago ·
MLA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ramos Martínez, E. (2016). Assessing biofilm development in drinking water distribution systems by Machine Learning methods
. (Doctoral Dissertation). Universitat Politècnica de València. Retrieved from http://hdl.handle.net/10251/63257
Chicago Manual of Style (16th Edition):
Ramos Martínez, Eva. “Assessing biofilm development in drinking water distribution systems by Machine Learning methods
.” 2016. Doctoral Dissertation, Universitat Politècnica de València. Accessed March 06, 2021.
http://hdl.handle.net/10251/63257.
MLA Handbook (7th Edition):
Ramos Martínez, Eva. “Assessing biofilm development in drinking water distribution systems by Machine Learning methods
.” 2016. Web. 06 Mar 2021.
Vancouver:
Ramos Martínez E. Assessing biofilm development in drinking water distribution systems by Machine Learning methods
. [Internet] [Doctoral dissertation]. Universitat Politècnica de València; 2016. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/10251/63257.
Council of Science Editors:
Ramos Martínez E. Assessing biofilm development in drinking water distribution systems by Machine Learning methods
. [Doctoral Dissertation]. Universitat Politècnica de València; 2016. Available from: http://hdl.handle.net/10251/63257
University of Minnesota
24.
Waak, Michael.
Investigation of the microbiomes in two full-scale drinking water distribution systems.
Degree: PhD, Civil Engineering, 2018, University of Minnesota
URL: http://hdl.handle.net/11299/216810
► The drinking water distribution system (DWDS) microbiome can impact public health as well as distribution infrastructure. Though the majority of bacterial biomass in the DWDS…
(more)
▼ The drinking water distribution system (DWDS) microbiome can impact public health as well as distribution infrastructure. Though the majority of bacterial biomass in the DWDS is associated with biofilms on the walls of water mains and other surfaces, there is a lack of understanding about the biofilms due to the challenges of accessing them. Using culture-independent methods targeting marker genes, including real-time quantitative polymerase chain reaction (qPCR) and high-throughput sequencing of PCR amplicons, the microbiomes of two full-scale systems were investigated—a DWDS in the United States that maintains a chloramine residual and another in Norway that intentionally has very low or no residual disinfectant in the distributed water. This work demonstrates that residual chloramine is a fundamental factor affecting the microbiome in a chloraminated DWDS. Not all changes to the microbiome due to chloramine, however, may be desirable. Namely, non-tuberculous mycobacteria (NTM) and ammonia-oxidizing bacteria (AOB) in water-main biofilms benefit from residual chloramine, and both of these taxa pose possible concerns to water utilities and their consumers: NTM include some opportunistic pathogens (especially Mycobacterium avium complex, or MAC), and AOB may contribute to biologically accelerated chloramine decay. Still, chloramine appeared to generally work as desired. Biofilm biomass was significantly lower in the chloraminated DWDS, despite ostensibly more favorable conditions for bacterial growth, and most taxa in the bulk drinking water were not observed in the biofilms. Legionellae, which may include some opportunistic pathogens, were significantly reduced from the biofilms of the chloraminated DWDS, and no MAC were detected in either system. Characterization of the NTM indicated nearly all in the chloraminated DWDS were Mycobacterium gordonae-like species, while various phylogenetically-different species of novel NTM were present in the no-residual DWDS. Chloramine-derived ammonia also appeared to support an AOB community in the chloraminated DWDS comprised primarily of Nitrosomonas oligotropha-like taxa. Abiotic reaction of nitrite with the chloramine likely hinders complete biotic nitrification; nitrite-oxidizing bacteria (NOB) are denied available nitrite. Conversely, AOB, NOB, and ammonia-oxidizing archaea were all present in the no-residual DWDS despite little or no ammonia in the drinking water. Finally, corrosion-associated bacteria like Desulfovibrio spp. were common underneath corrosion tubercles in both systems. Microbiological activity may therefore contribute to corrosion of cast-iron water mains, regardless of whether a disinfectant residual is maintained in the bulk drinking water. This work provides novel evidence that residual chloramine alters the DWDS microbiome by reducing total biomass and diversity of water-main —though the remaining taxa may still pose management challenges. Future work will need to expand this type of research to other systems before general applicability to other systems…
Subjects/Keywords: biofilms; chloramine; distribution system; drinking water; microbiome; opportunistic pathogens
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APA (6th Edition):
Waak, M. (2018). Investigation of the microbiomes in two full-scale drinking water distribution systems. (Doctoral Dissertation). University of Minnesota. Retrieved from http://hdl.handle.net/11299/216810
Chicago Manual of Style (16th Edition):
Waak, Michael. “Investigation of the microbiomes in two full-scale drinking water distribution systems.” 2018. Doctoral Dissertation, University of Minnesota. Accessed March 06, 2021.
http://hdl.handle.net/11299/216810.
MLA Handbook (7th Edition):
Waak, Michael. “Investigation of the microbiomes in two full-scale drinking water distribution systems.” 2018. Web. 06 Mar 2021.
Vancouver:
Waak M. Investigation of the microbiomes in two full-scale drinking water distribution systems. [Internet] [Doctoral dissertation]. University of Minnesota; 2018. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/11299/216810.
Council of Science Editors:
Waak M. Investigation of the microbiomes in two full-scale drinking water distribution systems. [Doctoral Dissertation]. University of Minnesota; 2018. Available from: http://hdl.handle.net/11299/216810
Curtin University of Technology
25.
Zhan, Weixi.
Effect of iron corrosion on the fate of dosed copper to inhibit nitrification in chloraminated water distribution system
.
Degree: 2011, Curtin University of Technology
URL: http://hdl.handle.net/20.500.11937/2386
► Nitrification has been acknowledged as one of the major barriers towards efficient chloramination in water supply distribution systems. Many water utilities employing monochloramine as the…
(more)
▼ Nitrification has been acknowledged as one of the major barriers towards efficient chloramination in water supply distribution systems. Many water utilities employing monochloramine as the final disinfectant have been encountering unwanted microbiologically assisted choramine decay and find it difficult to maintain desired chloramine residual at distribution system extremities. A novel method of using cupric sulphate (< 0.4 mg-Cu(II)/L) to inhibit ammonia oxidizing bacteria was recently granted a US patent (7465401). Efficient inhibition was achieved in bench scale work and a pilot reservoir in the field. However, unexpected dissolved Cu(II) loss occurred when copper salt was dosed into one pipe section of the Goldfield & Agricultural Water Supply System (G&AWSS) in Western Australia. It prevented dissolved copper from reaching extremities to protect chloramine from microbiologically assisted decay.Our previous research and evaluation of the pipe environment suggested that severe dissolved copper loss could be related to iron pipe corrosion due to aging of the cementlined steel pipe, extensive temperature fluctuation, chloramination and nitrification. A large amount of copper and iron found in sediments after the pipes’ flushing provided further evidence. Although scale formation could be a complicated process that depends on a variety of physical and chemical conditions and the composition of corrosion scale can be distinct in each particular system, based on the literature review, ferric hydroxide flocs are acknowledged as one of the major corrosion products. Consistent severe copper loss over the three-year trial indicated that iron pipe corrosion is continuously occurring in the distribution system and thus supplying fresh iron salts. Ferrous ions could be released from new crevices during the initial stage of corrosion and oxidized to ferric ions. Ferric ions are further converted to ferric hydroxide flocs under drinking ii water pH and oxidation conditions. Therefore, ferrous and ferric ions as well as ferric hydroxide were chosen as the major corrosion products in this research.Bearing the goal of improving the inhibition strategy, this research investigated aqueous copper speciation in bulk waters, quantified dissolved Cu(II) removal by the iron corrosion products at trace concentrations (< 2 mg-Fe/L) and modelled dissolved Cu(II) loss subject to iron pipe corrosion. Mundaring raw water (MRW), which is the source water of G&AWSS, was employed as the main water source in this study. In addition, the nitrified water (NW) which was sourced from our laboratory reactors and the water containing humic substance (HAW) were used to investigate the effects of natural organic matter (NOM) of different characters on the fate of dissolved copper. Batch experiments were undertaken to measure Cu(II) solubility under various aqueous conditions. MINEQL+® (chemical equilibrium modelling system) was used to analyse Cu(II) speciation and cross-examine aqueous Cu(II) concentrations measured in the laboratory experiments. Aqueous…
Subjects/Keywords: chloraminated water;
dosed copper;
distribution system;
nitrification;
iron corrosion
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APA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Zhan, W. (2011). Effect of iron corrosion on the fate of dosed copper to inhibit nitrification in chloraminated water distribution system
. (Thesis). Curtin University of Technology. Retrieved from http://hdl.handle.net/20.500.11937/2386
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Zhan, Weixi. “Effect of iron corrosion on the fate of dosed copper to inhibit nitrification in chloraminated water distribution system
.” 2011. Thesis, Curtin University of Technology. Accessed March 06, 2021.
http://hdl.handle.net/20.500.11937/2386.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zhan, Weixi. “Effect of iron corrosion on the fate of dosed copper to inhibit nitrification in chloraminated water distribution system
.” 2011. Web. 06 Mar 2021.
Vancouver:
Zhan W. Effect of iron corrosion on the fate of dosed copper to inhibit nitrification in chloraminated water distribution system
. [Internet] [Thesis]. Curtin University of Technology; 2011. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/20.500.11937/2386.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zhan W. Effect of iron corrosion on the fate of dosed copper to inhibit nitrification in chloraminated water distribution system
. [Thesis]. Curtin University of Technology; 2011. Available from: http://hdl.handle.net/20.500.11937/2386
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Adelaide
26.
Zeng, Wei.
Paired Impulse Response Function and Layer-Peeling Method for Anomaly Detection and Condition Assessment of Pipelines.
Degree: 2020, University of Adelaide
URL: http://hdl.handle.net/2440/124173
► Water transmission and distribution pipeline systems are one of society’s most important infrastructure assets. They consist of buried pipes that are often old and deteriorating…
(more)
▼ Water transmission and
distribution pipeline systems are one of society’s most important infrastructure assets. They consist of buried pipes that are often old and deteriorating and their condition is extremely difficult and expensive to determine. This PhD thesis focuses on developing non-invasive and cost-effective methods to both detect anomalies in
water pipelines and to assess the condition of pipelines that will allow for predictive repair. The first stage of the research is to identify and localize anomalies in the pipelines. The second stage is to assess the detailed condition of the pipe wall or the size of a blockage if the anomalies in the pipeline are deteriorated sections or blockages. In the thesis, a novel paired impulse response function (termed paired-IRF) technique has been developed for anomaly detection in pressurised pipelines. This is the first time that a transient-based method has been experimentally validated to be able to fully eliminate the effects from background pressure fluctuations and noise. The technique has a high spatial resolution by transferring the anomaly-induced wave reflections into sharp spikes. It has a high detectability by making use of a continuous signal as the injected wave. The continuous wave injection leads to continuous wave reflections and thus provides a large amount of information for signal analysing. The technique can be applied in pipe networks with arbitrary configurations and achieves a wide detection range. The advantages listed above make the technique potentially attractive for field applications. A layer-peeling method has also been developed for condition assessment in pressurised pipelines. The layer-peeling method, which has previously been applied to the inspection of musical instruments and the design of optical fibers, has in this thesis for the first time been applied to
water pipelines. It considers the frequency-dependent dissipation and dispersion of the transient waves in the pipeline and enables a bi-directional reconstruction of pipelines with branches. To compensate the cumulative errors which can occur in the layer-peeling method, a fast inverse transient method is developed. To improve the spatial resolution and the tolerance to background pressure fluctuations and noise, the paired-IRF technique has been combined with the layer-peeling method in the thesis. To assist in applying the techniques in the field, a voice-coil-based transient generation
system has been developed to generate transient waves and a customized in-pipe optical fiber sensor array has been used for transient pressure measurement. The transient generation and measurement
system has been applied in the laboratory and will be used to validate the proposed techniques in the field in the future.
Advisors/Committee Members: Lambert, Martin (advisor), Simpson, Angus (advisor), Cazzolato, Benjamin (advisor), School of Civil, Environmental and Mining Engineering (school).
Subjects/Keywords: Pipe condition assessment; water distribution system; leak detection; impulse response function
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Zeng, W. (2020). Paired Impulse Response Function and Layer-Peeling Method for Anomaly Detection and Condition Assessment of Pipelines. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/124173
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Zeng, Wei. “Paired Impulse Response Function and Layer-Peeling Method for Anomaly Detection and Condition Assessment of Pipelines.” 2020. Thesis, University of Adelaide. Accessed March 06, 2021.
http://hdl.handle.net/2440/124173.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zeng, Wei. “Paired Impulse Response Function and Layer-Peeling Method for Anomaly Detection and Condition Assessment of Pipelines.” 2020. Web. 06 Mar 2021.
Vancouver:
Zeng W. Paired Impulse Response Function and Layer-Peeling Method for Anomaly Detection and Condition Assessment of Pipelines. [Internet] [Thesis]. University of Adelaide; 2020. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/2440/124173.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zeng W. Paired Impulse Response Function and Layer-Peeling Method for Anomaly Detection and Condition Assessment of Pipelines. [Thesis]. University of Adelaide; 2020. Available from: http://hdl.handle.net/2440/124173
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Queens University
27.
Roshani, Ehsan.
Water Distribution System Design and Rehabilitation Under Climate Change Mitigation Scenarios
.
Degree: Civil Engineering, 2013, Queens University
URL: http://hdl.handle.net/1974/7895
► The water industry is a heavy consumer of electricity to pump water. Electricity generated with fossil fuel sources produce greenhouse gas (GHG) emissions that contribute…
(more)
▼ The water industry is a heavy consumer of electricity to pump water. Electricity generated with fossil fuel sources produce greenhouse gas (GHG) emissions that contribute to climate change. Carbon taxation and economic discounting in project planning are promising policies to reduce GHG emissions. The aim of this research is to develop novel single- and multi-objective optimization frameworks that incorporate a new gene-coding scheme and pipe ageing models (pipe roughness growth model, a pipe leakage model, and a pipe break model) to examine the impacts of a carbon tax and low discount rates on energy use, GHG emissions, and design/operation/rehabilitation decisions in water systems. Chapter 3 presents a new algorithm that optimizes the operation of pumps and reservoirs in water transmission systems. The algorithm was applied to the KamalSaleh transmission system near Arak, Iran. The results suggest that a carbon tax combined with a low discount rate produces small reductions in energy use and GHG emissions linked to pumping given the high static head of the KamalSaleh system. Chapter 4 presents a new algorithm that optimizes the design and expansion of water distribution networks. The algorithm was applied to the real-world Fairfield water network in Amherstview, Ontario, Canada. The results suggest that a carbon tax combined with a low discount rate does not significantly decrease energy use and GHG emissions because the Fairfield system had adequate installed hydraulic capacity. Chapters 5 and 6 present a new algorithm that optimizes the optimal rehabilitation type and timing of water mains in water distribution networks. In Chapter 5, the algorithm is applied to the Fairfield network to examine the impact of asset management strategies (quantity and infrastructure adjacency discounts) on system costs. The results suggest that applying discounts decreased capital and operational costs and favored pipe lining over pipe replacement and duplication. In Chapter 6, the water main rehabilitation optimization algorithm is applied to the Fairfield network to examine the impact of a carbon tax and low discount rates on energy use and GHG emissions. The results suggest that adopting a low discount rate and levying a carbon tax had a small impact in reducing energy use and GHG emissions and a significant impact in reducing leakage and pipe breaks in the Fairfield system. Further, a low discount rate and a carbon tax encouraged early investment in water main rehabilitation to reduce continuing leakage, pipe repair, energy, and GHG costs.
Subjects/Keywords: Operation
;
Design
;
Rehabilitation
;
Optimization
;
Water Distribution System
;
Greenhouse Gas emission
;
Expansion
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APA ·
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Manager
APA (6th Edition):
Roshani, E. (2013). Water Distribution System Design and Rehabilitation Under Climate Change Mitigation Scenarios
. (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/7895
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Roshani, Ehsan. “Water Distribution System Design and Rehabilitation Under Climate Change Mitigation Scenarios
.” 2013. Thesis, Queens University. Accessed March 06, 2021.
http://hdl.handle.net/1974/7895.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Roshani, Ehsan. “Water Distribution System Design and Rehabilitation Under Climate Change Mitigation Scenarios
.” 2013. Web. 06 Mar 2021.
Vancouver:
Roshani E. Water Distribution System Design and Rehabilitation Under Climate Change Mitigation Scenarios
. [Internet] [Thesis]. Queens University; 2013. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/1974/7895.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Roshani E. Water Distribution System Design and Rehabilitation Under Climate Change Mitigation Scenarios
. [Thesis]. Queens University; 2013. Available from: http://hdl.handle.net/1974/7895
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
28.
Gkonelas, Konstantinos.
Μείωση πραγματικών απωλειών νερού δικτύων ύδρευσης μέσω διαχείρισης πίεσης και προσδιορισμός του σημείου ισορροπίας αποδοτικής και ανταποδοτικής χρήσης νερού.
Degree: 2015, University of Thessaly (UTH); Πανεπιστήμιο Θεσσαλίας
URL: http://hdl.handle.net/10442/hedi/39806
► Framework Directive (WFD) 60/2000/EC and finding ways of Water Distribution System’s (WDS’s) Full Water Cost (FWC) calculation, was the trigger for the preparation of this…
(more)
▼ Framework Directive (WFD) 60/2000/EC and finding ways of Water Distribution System’s (WDS’s) Full Water Cost (FWC) calculation, was the trigger for the preparation of this thesis. An increase in water price is expected to follow the full water costing, so the general objective of the thesis was the documented alleviating of consumers impact by implementing Non-Revenue Water (NRW) strategies. A series of methodologies and tools were developed in order to find the equilibrium level of efficient (in terms of water volume) and reciprocating (in terms of revenue) water uses or otherwise the sustainability level of urban water uses, while a) applying full water costing and b) implementing operating pressure management within the limits of Economic Annual Real losses (EARL). It is demonstrated through the proposed methodology that application of pressure management within the EARL limits can absorb large increases in the water price and lead simultaneously to sustainable levels the various system’s demands. The main tools required for completing this thesis (both for shaping the methodology and for the implementation in a real water network), was the FWC calculation method, the formulation of the residential water demand equation and the price elasticity of residential water demand, the method of calculating the economic level of leakage (ELL - Economic Level of Leakage), the pressure management techniques and the full hydraulic model of the Water Distribution System (WDS). The thesis is divided into the basic methodology and four distinct pillars. The first pillar is the analysis of the water balance terms and strategies to reduce real water losses and in particular the analysis of the operating pressure implementation due to network’s segmentation in hydraulically isolated areas, called District Metered Areas (DMAs) and Pressure Reducing Valves (PRVs) installation. The second pillar is the search for ways of calculating the FWC components (Direct Cost – DC, Environmental Cost – EC, Resource Cost – RC) defined by the WFD. The other two pillars are the calculation of the consumers’ response to water price change and the calculation of water price elasticity of residential demand and the proper hydraulic simulation of WDSs through the use of suitable software.The basic methodology analyzes how to approach the problem and the connection of the four pillars with the broader objective of finding the system's sustainability level by increasing the FWC and by implementing simultaneously pressure management in the limits of EARL. The concerns and the theoretical background of the methodology are initially analyzed. In particular, the reaction (due to elasticity of demand) and the system’s balance achievement by increasing the water price because of FWC implementation was investigated. Subsequently, before the detailed development of the remaining pillars of work, the methodologies that connect the various procedures are presented. EARL calculation mechanisms are developed due to pressure management application. The FWC, the…
Subjects/Keywords: Μείωση πραγματικών απωλειών; Διαχείριση πίεσης λειτουργίας δικτύων ύδρευσης; Πλήρες κόστος νερού; Μοντελοποίηση δικτύων ύδρευσης; Non-revenue water reduction; Water distribution system pressure management; Full water cost; Water distribution system modelling
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APA (6th Edition):
Gkonelas, K. (2015). Μείωση πραγματικών απωλειών νερού δικτύων ύδρευσης μέσω διαχείρισης πίεσης και προσδιορισμός του σημείου ισορροπίας αποδοτικής και ανταποδοτικής χρήσης νερού. (Thesis). University of Thessaly (UTH); Πανεπιστήμιο Θεσσαλίας. Retrieved from http://hdl.handle.net/10442/hedi/39806
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Gkonelas, Konstantinos. “Μείωση πραγματικών απωλειών νερού δικτύων ύδρευσης μέσω διαχείρισης πίεσης και προσδιορισμός του σημείου ισορροπίας αποδοτικής και ανταποδοτικής χρήσης νερού.” 2015. Thesis, University of Thessaly (UTH); Πανεπιστήμιο Θεσσαλίας. Accessed March 06, 2021.
http://hdl.handle.net/10442/hedi/39806.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Gkonelas, Konstantinos. “Μείωση πραγματικών απωλειών νερού δικτύων ύδρευσης μέσω διαχείρισης πίεσης και προσδιορισμός του σημείου ισορροπίας αποδοτικής και ανταποδοτικής χρήσης νερού.” 2015. Web. 06 Mar 2021.
Vancouver:
Gkonelas K. Μείωση πραγματικών απωλειών νερού δικτύων ύδρευσης μέσω διαχείρισης πίεσης και προσδιορισμός του σημείου ισορροπίας αποδοτικής και ανταποδοτικής χρήσης νερού. [Internet] [Thesis]. University of Thessaly (UTH); Πανεπιστήμιο Θεσσαλίας; 2015. [cited 2021 Mar 06].
Available from: http://hdl.handle.net/10442/hedi/39806.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Gkonelas K. Μείωση πραγματικών απωλειών νερού δικτύων ύδρευσης μέσω διαχείρισης πίεσης και προσδιορισμός του σημείου ισορροπίας αποδοτικής και ανταποδοτικής χρήσης νερού. [Thesis]. University of Thessaly (UTH); Πανεπιστήμιο Θεσσαλίας; 2015. Available from: http://hdl.handle.net/10442/hedi/39806
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Addis Ababa University
29.
Seifemicheal, Molla.
Hydraulic Performance of Addis Ababa Water Distribution Systems (The Case of Jan Meda, Teferi Mekonnen, Belay Zeleke, Entoto, and Ras Kassa Sub-Systems)
.
Degree: 2018, Addis Ababa University
URL: http://10.6.20.92/xmlui/handle/123456789/20879
► The design of water distribution systems in Addis Ababa is implemented by using universal design factors without taking into consideration the effects of local conditions…
(more)
▼ The design of
water distribution systems in Addis Ababa is implemented by using universal
design factors without taking into consideration the effects of local conditions such as
intermittent pumping, which is the way of operating
water distribution systems in most cities
of the developing world. By this way the
water systems are divided into several pressure
zones through which
water is pumped alternatively and provide a large number of homes
with a high quantity of
water in a shorter period. This way makes the using of roof storage
tanks more efficient during the non – pumping intervals, so that the hydraulic performance
of the
water network expected to be degraded by affecting the pressure and velocities values.
To investigate the behavior of Addis Ababa
water distribution system under the action of
intermittent supply conditions; the Janmeda, Teferi Mekonnen, Belay Zeleke, Entoto and
Ras Kassa sub
water distribution network is taken as a case study and a procedure of
modeling the
system as in reality depending on operational factors, ways of operating and
managing the
system, representing each cluster of houses by one consumption node, making
control by check valves, and then modeling the
system by using (WaterCad Program). The
outputs show that the network is highly exposed to fluctuating pressure and velocity values,
which have negative effects on the performance of the network. As the result of
intermittency and insufficient
water supply, there is unreliable service and uneven
distribution of
water; a reduced network pressure due to the increased hydraulic losses
associated with increased flows and undersized pipe diameters; and increased
water leakage.
The comparison of pressure results and field measurements at specific locations shows a
reasonable and small difference.
The modeling of the
system as continuous supply
system depending on assumptions
considering with future
water consumption, availability of
water, enhancement of operation
& management of the
water supply
system, overcoming the problems of high and low
pressures by hydraulic modifications of
distribution system, and assuming steady state
analysis, the model output shows the ability of the existing
system to serve the Janmeda,
Teferi Mekonnen, Belay Zeleke, Entoto and Ras Kassa sub
system and to cope the future
extension. The output values of velocities are parallel reasonably to the assumed limits of
velocities (0.1 m/s – 0.3 m/s) to avoid stagnation and
water quality problems, also the
pressure values are within the limits of the design pressures in the residential areas.
Further evaluation has been carried out to investigate the daily
water consumption, daily
peak factors and to study the variations of
water levels in roof tanks under the conditions of
continuous supply by implementing an experiment of monitoring daily
water consumption
for different consumers at different locations for a period of 15 days. The average daily peak
factor is calculated to be 2.0, and a value of 79 l/c/d was…
Advisors/Committee Members: Geremew, Sahilu (PhD) (advisor).
Subjects/Keywords: Hydraulic Performance;
Intermittent water supply;
Pressure-driven demands;
Calibration;
Water distribution system
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Seifemicheal, M. (2018). Hydraulic Performance of Addis Ababa Water Distribution Systems (The Case of Jan Meda, Teferi Mekonnen, Belay Zeleke, Entoto, and Ras Kassa Sub-Systems)
. (Thesis). Addis Ababa University. Retrieved from http://10.6.20.92/xmlui/handle/123456789/20879
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Seifemicheal, Molla. “Hydraulic Performance of Addis Ababa Water Distribution Systems (The Case of Jan Meda, Teferi Mekonnen, Belay Zeleke, Entoto, and Ras Kassa Sub-Systems)
.” 2018. Thesis, Addis Ababa University. Accessed March 06, 2021.
http://10.6.20.92/xmlui/handle/123456789/20879.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Seifemicheal, Molla. “Hydraulic Performance of Addis Ababa Water Distribution Systems (The Case of Jan Meda, Teferi Mekonnen, Belay Zeleke, Entoto, and Ras Kassa Sub-Systems)
.” 2018. Web. 06 Mar 2021.
Vancouver:
Seifemicheal M. Hydraulic Performance of Addis Ababa Water Distribution Systems (The Case of Jan Meda, Teferi Mekonnen, Belay Zeleke, Entoto, and Ras Kassa Sub-Systems)
. [Internet] [Thesis]. Addis Ababa University; 2018. [cited 2021 Mar 06].
Available from: http://10.6.20.92/xmlui/handle/123456789/20879.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Seifemicheal M. Hydraulic Performance of Addis Ababa Water Distribution Systems (The Case of Jan Meda, Teferi Mekonnen, Belay Zeleke, Entoto, and Ras Kassa Sub-Systems)
. [Thesis]. Addis Ababa University; 2018. Available from: http://10.6.20.92/xmlui/handle/123456789/20879
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Arkansas
30.
Belcher, Kaleb Oren.
Accumulation of Lead by Biofilms in Drinking Water Distribution Systems.
Degree: MSCE, 2018, University of Arkansas
URL: https://scholarworks.uark.edu/etd/3070
► Recent crises, such as the one in Flint, MI, indicate that lead exposure from drinking water is a major health concern in the United…
(more)
▼ Recent crises, such as the one in Flint, MI, indicate that lead exposure from drinking
water is a major health concern in the United States. Over six million lead service lines are still in use in the United States, and a universal protocol to safely remove these lead service lines from drinking
water distribution systems has not yet been established. This paper calls to attention the potential hazard that biofilms pose as a source of lead in
distribution systems, even after the removal of lead pipes. This study used a simulated
water distribution system containing a lead source pipe and various pipe materials with periodic flow and stagnation conditions of a typical household to create, characterize, and determine lead accumulation capabilities of biofilms within the
water pipes. Biofilms developed in all pipe materials with an overall range of 1.44×103 to 5.90×105 gene copies per cm2 of pipe surface. Pipe material affected the biofilm growth with plastic pipes supporting higher quantities of biofilms. Biofilms accumulated lead in all pipe materials with a maximum accumulation of 25.22 µg/cm2. In addition, all pipe trains experienced an increase in lead accumulation immediately following the removal of the lead source with a maximum increase of 21.42 µg/cm2 in the galvanized steel pipe and then a gradual decrease during a period of one month afterward. The lead source also had an effect on the microbiome of the biofilms collected during the project. One genus specifically, Sphingobium, increased in all pipe materials following the removal of lead. This research provides valuable information regarding the timing and process of safe lead service line removal from drinking
water distribution systems and helps minimize the human exposure to lead contamination within drinking
water.
Advisors/Committee Members: Wen Zhang, Franck Carbonero, Hua Jiang.
Subjects/Keywords: Biofilm; Drinking Water; Drinking Water Distribution System; Lead; Civil Engineering; Environmental Engineering; Hydraulic Engineering
Record Details
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Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Belcher, K. O. (2018). Accumulation of Lead by Biofilms in Drinking Water Distribution Systems. (Masters Thesis). University of Arkansas. Retrieved from https://scholarworks.uark.edu/etd/3070
Chicago Manual of Style (16th Edition):
Belcher, Kaleb Oren. “Accumulation of Lead by Biofilms in Drinking Water Distribution Systems.” 2018. Masters Thesis, University of Arkansas. Accessed March 06, 2021.
https://scholarworks.uark.edu/etd/3070.
MLA Handbook (7th Edition):
Belcher, Kaleb Oren. “Accumulation of Lead by Biofilms in Drinking Water Distribution Systems.” 2018. Web. 06 Mar 2021.
Vancouver:
Belcher KO. Accumulation of Lead by Biofilms in Drinking Water Distribution Systems. [Internet] [Masters thesis]. University of Arkansas; 2018. [cited 2021 Mar 06].
Available from: https://scholarworks.uark.edu/etd/3070.
Council of Science Editors:
Belcher KO. Accumulation of Lead by Biofilms in Drinking Water Distribution Systems. [Masters Thesis]. University of Arkansas; 2018. Available from: https://scholarworks.uark.edu/etd/3070
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Open Access Theses and Dissertations