Kajian Pengembangan Jaringan Distribusi Air Bersih pada PDAM Tirta Barito Kota Buntok

Abstract

PDAM of the City of Buntok is the supplier of clean water needs for the areas of Buntok Kota, Hilirsper, and Jelapat Hamlets and Pamait Village. Population growth, water loss and utilization of discharge that has not been optimal have become obstacles in service. The aim of the research is to evaluate the existing distribution network and development plan until 2038 as viewed from the aspect of hydraulics and water quality using WaterCAD v8i software, as well as economic analysis to determine water prices. The available discharge is 10, 000 l/s. Simulation of the existing condition produces pressure and headloss gradient that meet technical requirements, while velocity did not meet technical criteria. Water requirements for 2038 need an additional Water Treatment Plant with capacities of 30 l/s and 20 l/s. The simulation of development results met the technical requirements, being 0.3-4.5 m/s, a headloss gradient 0-15 m/km, and pressure of 0.5-8 atm. Further, the hydraulic model was used to analyse the concentration of residual chlorine. Injection at the tank inlet amounted to a constant 0.4 mg/l. Simulation of produced residual chlorine met the requirements from 0.383-0.395 mg/l. Economic analysis resulted in a water price of Rp. 6, 100.00/m3, BCR 1.23, IRR 12.14 %, and BEP of 11 years. Based on the willingness to pay being Rp. 4, 200.00/m3, the value of required government subsidies is Rp. 13, 905, 747, 800.