Pendugaan Debit Aliran Sungai Ciliwung Di Bendung Katulampa Menggunakan Software ArcSWAT

Abstract

Ciliwung upstream watershed region has functions as a protector area and also buffer area of the watershed. At present there are many land function changing on the Ciliwung watershed that effecting the river overflow easly until flooding in the downstream. River discharge assessment become important to do in order to prevent flooding. ArcSWAT software is a tool which used in this discharge assessment. ArcSWAT software have 4 processes to do, that are watershed delineation, shaping of Hydrological Response Unit (HRU), shaping of climate data, and also simulation process. Simulation yield for the upperstream of Ciliwung watershed has shaped 27 sub-basin and also 491 kind of HRU. This research utilize SWAT Editor as the application for the calibration. Base on simulation yield calibrated, maximum monthly discharge has been obtained as big as 59.42 m3/sec, minimum discharge as big as 2.02 m3/sec, and also average discharge as big as 14.61 m3/sec. Coefficient determination value of R2 and NS value are 0.831 and 0.599. For this result the simulation yield of ArcSWAT for Ciliwung upperstream watershed is valid with the good category result.