Analisis Potensi Banjir Kecamatan Lubuk Pakam, Kabupaten Deli Serdang Dengan Menggunakan Aplikasi Hec-Ras (River Analysis System) dan Epa Swmm 5.2 (Enviromental Protection Agency Storm Water Management Model)

Abstract

Flooding is the inundation of a place due to high rainfall and causes an overflow of water that exceeds the water disposal capacity of an area and causes economic, social and physical losses. This research is motivated by the condition of the drainage and rivers in Paluh Kemiri Village/Subdistrict which cannot accommodate the large amount of incoming discharge due to high rainfall at the end of the year. This study aims to obtain and determine the potential for flood inundation in the Paluh Kemiri Village/District area with a flood inundation map produced from the Hydrologic Engineering Center - River Analysis (HEC-Ras) software with the Environmental Protection Agency Storm Water Management Model (EPA SWMM). In carrying out this study, data was collected which included geometric data, rainfall data from BMKG, and land use data. The Log Pearson III method fulfills the requirements for rainfall frequency distribution. Next, flood discharge calculations were carried out using the Rational Method for return periods of 5, 10, 25, 50 and 100 years. After that, channel capacity discharge calculations were carried out using the R. Manning Method. From the results of manual calculations, analysis of flood inundation in drainage using the Hydrologic Engineering Center - River Analysis (HEC-Ras) software and the Environmental Protection Agency Storm Water Management Model (EPA SWMM) software, it can be seen that there is flood inundation at return periods 25, 50 and 100 year. The location of the floodwaters is in the drainage on Jalan Ahmad Yani, Jalan Walet, Jalan Inpres SD, Jalan Sudirman, Jalan Gg Front Polres/Jalan Kuburan, and Jalan LP. And the drainage location where no puddles occur is the drainage on Jalan Malinda and on Jalan Sudirman. For the estimated loss due to flood disasters with a return period of 5, 10, 25, 50 and 100 years, it is IDR. 23,179,816,552.