Hydraulic modelling of the water distribution system of Tavua-Vatukoula, Fiji

Senokonoko, Kemueli Bainivalu (2014) Hydraulic modelling of the water distribution system of Tavua-Vatukoula, Fiji. [USQ Project]


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This study assessed the performance of the drinking water distribution system of the Tavua/Vatukoula network, Fiji. An important aim and a requisite of the work was the collection and assessment of pertinent data, to enable the development of a detailed hydraulic system model for analyses and simulations.

This study utilized EPANET v2, a popular and freely available software package developed by US Environment Protection Agency. The major features and most important characteristics of EPANET presented and discussed in detail in this report.

The technical focus of this study was mainly on available water pressures in various hydraulic loading scenarios. Pressure conditions were determined for average daily demand, maximum hourly demand, minimum demand, and peak hourly at maximum water plant delivery, as well involved extended (24 h) simulation runs. These examinations revealed various bottlenecks and shortcomings in the network, and provided insight into the underlying causes to suggest effective remediation approaches.

System simulations show that currently the Tavua/Vatukoula system is capable of providing satisfactory supply to the gross majority of customers, and only several distinct locations experience pressure deficiencies. System capacity also would allow the connection and supply of the proposed new sugar mill south of Tavua town (up to 4.63 L/s continuous demand) with not significant impact on existing customers. However, service would be severely limited for increased demand, and widespread pressure problems would arise at maximum water plant deliveries, indicating that network augmentation will be necessary in the coming years.

There was no sufficient data to allow for any disinfectant residual modelling. Nevertheless, water age simulations were carried out over extended (168 hours) periods, which identified various mains and branch pipelines prone to water stagnation. Analysis of operational issues, such as access for maintenance, placement of pressure regulating (PRV) valves, and the promptness with which repairs can be made, among other multidisciplinary concerns, were outside the scope of this study.

While various shortcomings and problems of the water network system were identified in this study, the current hydraulic model has limitations and will benefit from future improvements. The design and planning of remediation and augmentation works will require more and better quality data for model calibration.

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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Engineering (Environmental) project.
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences (1 Jul 2013 - 5 Sep 2019)
Supervisors: Erdei, Laszlo
Date Deposited: 09 Sep 2015 05:14
Last Modified: 08 Mar 2016 02:04
Uncontrolled Keywords: water supply, distribution network, hydraulic modelling, EPANET
Fields of Research (2008): 09 Engineering > 0907 Environmental Engineering > 090799 Environmental Engineering not elsewhere classified
Fields of Research (2020): 40 ENGINEERING > 4011 Environmental engineering > 401199 Environmental engineering not elsewhere classified
URI: https://sear.unisq.edu.au/id/eprint/27261

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