THE ANALYSIS OF FLOOD MANAGEMENT IN WEST CIKARANG USING EP SWMM 5.0 (CASE STUDY: JABABEKA II INDUSTRIAL ESTATE)

Abstract

In the study case, Jababeka II Industrial Estate has an annual flood problem since 2014 [35]. As for the indicate the cause of the problem, this research was conduct to analyze the existing condition and knowing the water balances in Jababeka II Industrial Estate using SWMM software. Since learning the study area's current situation, many solutions came up to decrease flood. But based on the previous research that recommends applying cistern for each tenant industry, this study using SWMM wants to know the effectiveness of flood reduction using Low Impact Development (LID) control. The type of LID that is used is rain barrel. In conducting the study, the method used a quantitative method and used secondary data for the data collection method. These data refer to data collected from the WTP Jababeka Residential, drainage dimension, and Jababeka II master plan from the existing drainage system with precipitation events in 12 years (2009-2020). Other than that, Google Maps observation was used to obtain an impermeable area. Because using LID control, divided into two impervious regions, all waterproof categories are first and second impermeable treated areas. Precipitation data used for hydrological analysis is on the city classification to get the amount of rainfall planned for the five-year return period. The probability distribution uses Log- Pearson III with a planned rain of 128.22 mm/d and the highest intensity of 54 mm. Due to the simulation result it was found that seven-channel is not from the industry area as a temporary area, affecting the industry's discharge channel capacity. Thus, floods occurred in many points of drainage caused by the limited green surface area. It shows that water imbalance occurred, which between inflow and outflow of Jababeka II is not equal with a surface-continuity result of -0.151%. Meanwhile, using the same planned rainfall and intensity, the simulation results using LID control show an increase in the likelihood of flooding, with as many as 25 subcatchments using LID control based on a building area of more than 10,000 m2. So, it can be concluded that based on the simulation results of the existing conditions, the amount of water entering Jababeka II is not the same as the amount of water that comes out. It causes flooding in several locations. And the simulation results using LID, which in this study served as an alternative solution, namely the use of rain barrels in several industries, showed less effective in reducing the possibility of flooding. Therefore, the recommended change of the dimensions according to water storage is that the reduction in the case of flooding can be optimized.