PENDUGAAN DEBIT ANDALAN MENGGUNAKAN MODEL SWAT DI SUNGAI KUNCIR, KABUPATEN NGANJUK, JAWA TIMUR FAJARDO

FAJARDO. Estimation of Dependable Flow in Kuncir River, Nganjuk District, East Java using SWAT Model. Supervised by LIYANTONO. Kuncir River is the primary drainage canal that becomes the source of irrigation facilities in Nganjuk district. The potential of Kuncir River can be assessed by measuring the dependable flow to become an indicator of the amount of water supply to the community area. This research aims to apply SWAT model to estimate the river flow and measure the dependable flow in Kuncir River, Nganjuk district. Data was collected from Kuncir River, Nganjuk district, East Java. There are two major steps on this research, model establishment and model simulation using SWAT after data calibration and validation. Model simulation has high correlations with the observed data. It is showed by NS value of 0.67 and mean daily flow of 7.15 m 3 s -1 . Land use change scenario showed that the conversion of forest and range-grasses into agriculture land potentially increase the flow of Kuncir River.