EFFECT OF NODAL ELEVATION REVISION IN WATER DISTRIBUTION SYSTEM: A CASE STUDY OF METROPOLITAN WATERWORKS AUTHORITY, THAILAND

Abstract

Bangkok, Nonthaburi and Samut Prakan are the three most densely populated provinces in
Thailand. They have a large drinking water consumption supplied by the Metropolitan Waterworks Authority
(MWA). MWA’s service area is over 2.42 km2 with 2.33 million customers (1 customer is 1 household) and it
had to supply 5.843 million m3 of drinking water per day in the year 2017. Because the main pipe network is
very complex and extremely large. For this reason, it is very difficult to manage the water supply. In order to
decide a suitable supply, EPANET is one of the tools for managing a water supply in the main water piping
network but it can lead to an error of nodal elevation in the pipe network. In this research, we have revised the
nodal elevation on the pipe network by reference from Bangkok roads elevation map, it was found that the new
pipe network has better accuracy of up to 87.63%, an improvement on the existing model of 3.95%.