Perencanaan Bioretensi Jalan Manggis Kecamatan Patrang Kabupaten Jember dengan Variasi Model Distribusi Probabilitas Curah Hujan

Abstract

Patrang District is a densely populated area with a total population in 2023 of 103,048 people, with a population growth rate in 2020-2023 of 63.28% (BPS Jember Regency in Figures, 2024). The increase in population has an impact on the occurrence of many developments for residential needs, resulting in a reduction in water catchment areas in the Patrang area, one of which occurs in the Jalan Manggis area, Patrang District, Jember Regency. The lack of water catchment areas and high rainfall in densely populated residential areas has a negative impact such as flooding / inundation if not handled properly. Handling of high rainfall can be done by creating a drainage system. In this research, the drainage system used is a bioretention type of eco-drainage. The purpose of this research is to find out what distribution model is in accordance with rainfall data in the study area and to find out how much decrease in the volume of standing water from the results of modeling simulations. This research uses RStudio 4.2.2 software for rainfall analysis, where the rainfall data used is the monthly maximum rainfall data using several distribution models, namely Normal distribution, Log-Normal distribution, Log-Pearson III distribution, Gumbel distribution, Gamma distribution, Weibull distribution, Frechet distribution, and Pareto II distribution. Test the suitability of the distribution model using Kolmogorov-Smirnov test with Asymptotic simulation, Kolmogorov-Smirnov test with Monte Carlo simulation, Kolmogorov-Smirnov test with Exact simulation. Bioretention planning using EPA SWMM 5.2 modeling software. Rainfall intensity data is planned using a return period of 2, 5 and 10 years, with subcatchment planning of 14 areas, 16 junctions, 3 outfalls and 14 conduits. The results of the rainfall analysis obtained the most suitable distribution model is the normal distribution. 2. The largest reduction in nundation volume for the 2-year return period is at Junction J10 with a reduction of 17.72%, for the 5-year return period is J9 with a reduction of 21.47%, and for the 10-year return period is J9 with a reduction of 19.76%.