Abstract
Land use change due to housing construction can indirectly damage the water catchment area. This resulted in a decrease in the area of rainwater absorption that caused rain water collected on existing drainage channels. This study aims to analyse the number and dimensions of infiltration wells in reducing the volume of inundation and determine the value of effectiveness reduction of runoff. The infiltration wells was used to collect rainwater and absorb it into the soil. Based on the calculation in Babakan Village area of 2.42 ha, with runoff coefficient of 0.4 for village character, and design rainfall of 97.36 mm/day, the estimated flood volume based on SNI 03-2453-2002 was 805790.30 liter or 805.79 m3. Based on the calculation, Babakan Village needed 115 infiltration wells and 76 trenches. With the infiltration wells and trenches, the total flood volume can be reduced 620.62 m3 or 77.02% of the total runoff.Keywords: design rainfall, infiltration wells, runoff, trenches
Highlights
Perubahan penggunaan lahan akibat pembangunan perumahan, secara tidak langsung dapat merusak kawasan resapan air
This study aims to analyze the number and dimensions of infiltration wells in reducing the volume of inundation and determine the value of effectiveness reduction of runoff
Based on the calculation in Babakan Village area of 2.42 ha, with runoff coefficient of 0.4 for village character, and design rainfall of 97.36 mm/day, the estimated flood volume based on SNI 03-2453-2002 was 805790.30 liter or 805.79 m3
Summary
Uji kecocokan jenis distribusi dilakukan pada keempat jenis distribusi untuk mengetahui tingkat kecocokan jenis distribusi yang digunakan dalam analisis selanjutnya (Agus et al 2013). Uji ini dilakukan dengan dua metode yaitu uji Smirnov-Kolmogorov dan uji parameter statistik. Uji Smirnov Kolmogorov digunakan untuk menentukan contoh uji dari fungsi probabilitas yang kontinu (Ayoola dan Azeez 2012). Analisis data yang dilakukan pada keempat metode tersebut meliputi rata-rata, simpangan baku, koefisien variasi, koefisien skewness (kecondongan) dan koefisien kurtosis. Hasil yang didapat untuk keempat metode tersebut, kemudian dilakukan uji kecocokan dengan metode SmirnovKolmogorov atau uji kesesuaian nonparametrik. Uji kecocokan ini digunakan untuk menentukan nilai curah hujan rancangan dari keempat metode ditribusi frekuensi yang paling cocok digunakan di lokasi penelitian. Penentuan periode ulang untuk hujan rancangan yang digunakan di lokasi penelitian dilakukan berdasarkan SNI 032453-2002 (BSN 2002).
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