Application of Tank Model for Ungauged Reservoir Management: A Case of Situ Cipondoh, Tangerang Indonesia

Abstract

Situ Cipondoh is an artificial urban lake, and it is one of the raw water sources for the Regional Drinking Water Company (PDAM) of Tangerang Munacipality. Even though relatively has a large capacity, the lake often overflows during the rainy season and recedes during the dry season. This study aims to optimize the lake’s reservoirs and analyze the reliability. Tank model simulation was carried out to optimize the water level so that the reservoir can accommodate the flood discharge and provide raw water. Simulations are carried out in eight scenarios, to saw the impact of implementing operating rules, conservation of catchment areas and the increase in raw water intake to the reliability. Based on the modeling, rule curve of water levels should be ranging from 3.10-3.43m in wet years, and 2.76-3.23m in dry years. Meanwhile, based on the scenarios the lake showed various results of reliabilities (%) depend on the implementation of operating rules and the level of the catchment area's conservation. To maintain the reliability of Situ Cipondoh, the increase of PDAM raw water treatment capacity from 30 liters/ second to 150 liters/ second, needs to be accompanied by several efforts to increase water absorption in the catchment area.

Keywords: reliability, reservoir, tank model, urban lake, water level

DOI: 10.7176/JEES/9-1-07