Advanced pipe networks modeling for pressure management and water leakage control

Name: Sutthisak Lapprasert

LCSH: Kasetsart University -- Dissertations. Ph.D. (Water Resources Engineering) 2018

Classification :.LCCS: TD491

LCSH: Kasetsart University. -- Department of Water Resources Engineering -- Dissertations

LCSH: Water-supply -- Management

LCSH: Water -- Distribution

LCSH: Water leakage

LCSH: Water-pipes

Abstract: Metropolitan Waterworks Authority (MWA) is responsible for providing potable water for 3 provinces in Thailand: Bangkok, Nonthaburi and Samutprakarn, covering the total area of 3,195 sq.km and producing approximately 5 million cu.m per day. Its trunk mains networks composes of 1,727 km of 500-1800 mm trunk mains, 4 water treatment plants, 11 distribution pumping stations, 130 partially open valves and 1,535 district meters. This complex and enormous pipe networks is not convenient nor possible to be built and calibrated manually. Therefore, this dissertation aims to develop two additional modules supporting the EPANET water distribution system modeling software to investigate pressure, water loss and energy of the MWA trunk mains networks. The first module is for importing the whole data in the GIS and table formats. The second module is an automatic calibration module using the Differential Evolution (DE). It has an ability to automatically adjust the loss coefficients of partially open valves to satisfy pressure at calibration points. In the study, the calibration points were 134 metering points called “U” and “UZ” on the MWA trunk mains networks. It gave a satisfactory result with the correlation coefficient of 0.93 and RMSE of 2.24 m. Moreover, when validating the model with pressure at the 20 metering points called “P”, it still gave good agreement. Two main applications were studied: 1) pressure management and water loss control and 2) energy loss assessment. For the first application, an inverse linear relationship between pressure and water leakage for MWA was found. If MWA can reduce the percentage of water loss to 19% as its plan, the average water pressure of its trunk mains networks will increase to 10.68 meters, greater than its target, by itself without raising pressure at any pumping stations. The second application found that about half of the MWA input energy lost in the trunk mains networks, and the energy left at the district meters was only about 49.8% of the total energy. The causes of the energy loss are the outgoing energy through leakage on trunk mains (3.6%), the friction loss at the feed lines between trunk mains and district meters (18.8%), the friction loss on trunk mains (23.1%) and the loss by the partially-opening valves (4.7%). In conclusion, MWA should reduce water loss, redesign the feed lines and fully open the valves to achieve its pressure target and increase the energy efficiency of its networks.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Adichai Pornprommin

Role: Thesis Advisor

Name: Suwatana Chittaladakorn

Role: Thesis CO-Advisor

Name: Surachai Lipiwattanakarn

Role: Thesis CO-Advisor

Created: 2018

Modified: 2025-06-29

Issued: 2025-06-29

วิทยานิพนธ์/Thesis

application/pdf

URL: https://www.lib.ku.ac.th/KUthesis/2561/sutthisak-lap-all.pdf

CallNumber: TD491 .S88

eng

DegreeName: Doctor of Philosophy

Level: Doctoral Degree

Descipline: Water Resources Engineering

Grantor: Kasetsart University

©copyrights Kasetsart University

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