ANALISIS KINERJA DRAINASE KOMPLEK KAWASAN INDUSTRI CIKARANG SELATAN KABUPATEN BEKASI

Abstract

Kawasan industri di Cikarang Selatan, Kabupaten Bekasi, mengalami genangan berulang akibat topografi cekung dan kapasitas drainase eksisting yang tidak memadai. Penelitian ini bertujuan mengevaluasi kinerja sistem drainase dan merumuskan rekomendasi perbaikan menggunakan pemodelan EPA SWMM 5.2 berdasarkan curah hujan periode ulang sepuluh tahun. Kondisi eksisting menunjukkan kinerja buruk dengan 22 titik genangan, volume genangan 92,89 × 106 liter, limpasan permukaan 120,98 × 106 liter, dan koefisien limpasan rata-rata 0,92. Perbaikan dilakukan secara kumulatif melalui penerapan Low Impact Development berupa rain barrel, redesain 38 saluran, dan pemasangan pompa pada dua titik cekung. Seluruh metode menurunkan koefisien limpasan menjadi 0,41, mengurangi limpasan permukaan sebesar 53,2%, serta menghilangkan seluruh titik genangan menjadi nol titik atau setara pengurangan volume banjir 100%. Total kebutuhan biaya diestimasi sebesar Rp60,89 miliar. Kombinasi ketiga metode terbukti efektif mengatasi genangan pada seluruh jaringan drainase kawasan.

The industrial area in South Cikarang, Bekasi Regency, experiences recurring inundation due to its concave topography and insufficient existing drainage capacity. This study evaluates the drainage system performance and formulates improvement recommendations using EPA SWMM 5.2 modeling based on a ten-year return period rainfall. Existing conditions showed poor performance, with 22 flooded nodes, a flood volume of 92.89 × 106 liters, total surface runoff of 120.98 × 106 liters, and an average runoff coefficient of 0.92. Improvements were applied cumulatively through Low Impact Development using rain barrels, resizing of 38 conduits, and pump installation at two concave points. Applying all methods reduced the runoff coefficient to 0.41, decreased surface runoff by 53.2%, and eliminated all flooded nodes to zero, equivalent to a 100% reduction in flood volume. The total cost is estimated at IDR 60.89 billion. The combination of the three methods effectively resolved inundation across the entire drainage network.