DRAINAGE SYSTEM EVALUATION USING EPA SWMM 5.1 SOFTWARE (CASE STUDY: SETIA ASIH VILLAGE, TARUMAJAYA SUB-DISTRICT, BEKASI DISTRICT)

Abstract

Inadequate drainage conditions in storing rainwater can cause the runoff to become overflow to the surface of the street and can cause flood. According to the Head of the Bekasi District Disaster Management Agency, poor drainage in residential areas, one of which occurs in Tarumajaya District, causes flooding during the rainy season. The purpose of this study is to identify existing drainage channels, to determine the amount of runoff, and to analyze the drainage network that is suitable for the runoff in Setia Asih Village was used by EPA SWMM 5.1. The data collection was used primary data was obtained in direct observation namely, drainage dimension. The secondary data was used daily maximum rainfall and land use maps. The analysis data using analysis frequency, Chi-square test, Smirnov-Kolmogorov test and SWMM 5.1 software. Based on the result, the planned rainfall is log-pearson III was 126.38 mm with a rain distribution was 39.42 mm/hour. In existing conditions, the total average infiltration value is 0.2 mm and the total average runoff discharge of subcatchment is 0.17 m3/s. In the simulation result, the total average discharge simulation is 0.13 m3/s and there was 8 channels overflow runoff capacity and 11 channels potential over runoff capacity. Based on the resimulation results with optimal dimensions the total average discharge is 0.24 m3/s bigger than the discharge simulations and existing the means is the optimal dimension can accommodate the total runoff in Setia Asih Village and there were no channels with over runoff capacity and potential over runoff capacity.