ANALISIS DEBIT SUNGAI DENGAN MENGGUNAKAN MODEL SWATPADA 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 l/s, PT Krakatau Tirta Industri (KTI) cannot
fulfill the amount number of demand from the industrial and domestic sectors at
Cilegon. To cover the shortage of water supply of ±600 l/s, PT KTI requires
taking water from Cipasauran Watershed. The objective of this study was to
analyze river discharge of Cipasauran Watershed using SWAT model. Input data
such as soil characteristics, climate data, landuse, and hydrology data at the
area of the watershed were gathered and put at the data input file. In SWAT
simulation, 4 processes 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. This showed that daily and monthly PT
KTI’s water demand of 0.6 m3/s were fulfilled about 98.22% and 100%. Within the
future time, the SWAT model could be potentially used as an assessment for
predictive scenarios. However, to gain optimum results, well-observed and
precise data is highly required, especially for such calibrations and
validations.
Penulis: Maulana Ibrahim Rau,
Nora Pandjaitan, Asep Sapei
Kode Jurnal: jppertaniandd150362