Analisis Hidrologi di Sub DAS Ciliwung Hulu Menggunakan Model SWAT

Abstract

The Ciliwung Watershed is one of the area which has a critical condition. It caused by residential increased in upper area. This condition change of hydrologic characteristics such as run off increased and flood risk. It means Ciliwung Watershed management must be improve. SWAT model can applied for watershed management scenario, such as predict run off and water balance. Model validation used daily data from 2001 to 2010 resulted the NSE 0.53 and R2 0.57, it means SWAT model is satisfy to predict hydrological conditions of the Upper Ciliwung Watershed. SWAT model shows by input annual rainfall 3 790.12 mm results run off 38.45% (1 457.38 mm/year), evapotranspiration 22.06% (836.04 mm/year), lateral flow 20.31% (769.92 mm/year), percolation 15.28% (579.02 mm/year), and ground water 3.90% (147.77 mm/year). Applied recharging well scenario at settlement area with the infiltration function similar with forest predict can reduce run off 46.17% (672.93 mm/year).