Impact of Additional Water Capacity from Umbulan Spring to Water Distribution System of Central Gresik and South Gresik

Abstract

The service area of drinking water in Gresik is divided into three zones: Central Gresik Zone, Central Gresik Zone, and South Gresik Zone. Gresik would receive an additional flow of 1,000 l/s from Umbulan Spring in 2021 to supply the demand of Central Gresik Zone. Legundi Water Treatment Plant (WTP) and Dewata WTP are two of several WTPs that supply Central Gresik Zone’s demand. Moreover, those two aforementioned WTPs also supply Central Gresik Zone’s demand. Once there is additional water capacity from Umbulan Spring, the water capacity of those two WTPs will be allocated to supply Central Gresik Zone’s demand. Central Gresik Zone is also supplied by Drupadi WTP which supplies South Gresik Zone’s demand. The rate of drinking water service in Central Gresik Zone and South Gresik Zone has not reached 100% especially in Benjeng sub-district and Balongpanggang sub-district. Therefore, the distribution pipeline network was planned to be developed in stages starting from 2015 until 2030. Analysis result of additional capacity to existing distribution pipeline network in 2021 showed incompatibility to design criteria.