Analisis Debit Sungai Dengan Menggunakan Model SWAT Pada DAS Cipasauran, Banten

Abstract

Total water demand at non industrial and industrial region in Cilegon is increasing. With its water production capacity of 2,000 lt/s, PT Krakatau Tirta Industri can't fulfill the amount number of demand from all sectors at Cilegon. To cover the shortage of water supply of ±600 lt/s, PT KTI must take more water from Cipasauran Watershed. SWAT model could be use to make a discharge analysis concerning to water supply at Cipasauran Watershed. Input data such as soil characteristics, climate data, landuse, and hydrology data at the area of the watershed were prepared and inputted at the data input file. In SWAT simulation, 4 process were done, i.e. watershed delineation, hydrological response unit (HRU) forming, data process and SWAT simulation, and visualization process. The result showed that the daily and monthly calibration process crossed 84% and 83% with the 95PPU area, with daily and monthly p-factor value of 0.84 and 0.83. Thus, calibrated model result was valid, though R2 and NS value were not satisfied. Using the validated SWAT model, the daily discharge in Cipasauran Watershed was about 0 - 3.309 m3/s, whereas the monthly discharge was 0.648 - 3.266 m3/s. It meaned that daily and monthly water demand of 0.6 m3/s were fulfilled about 98.22% and 100%.