Hydrological model of Ciawi dry dam using GPM satellite data

Abstract

Ciawi Dam is the first dry dam in Indonesia. The benefits of the dam are to reduce flooding in the capital city of Jakarta, especially at a 50-year return period. The operation of the dam using 1 conduit unit aims to cut the flood peak. The flood discharge analysis that has been used so far is very limited due to the lack of existing rainfall data. So that calculations are carried out using corrected satellite data. In addition, flood discharge is also calibrated to the discharge at the Katulampa Weir. Analysis of the design rainfall shows the value of design rainfall with 50-year return (R50) is 210.59 mm and the 50-year flood discharge (Q50) is 317.13 m3/dt. The flood reduction value at the 50-year return period is 27%. If an alternative water gate is added, the flood reduction value can increase up to 72% with an opening of 30%.