ANALISIS KETERSEDIAAN AIR SUNGAI PROGO DENGAN MENGGUNAKAN MODEL SOIL MOISTURE ACCOUNTING PROGRAM HEC-HMS DI OUTLET BENDUNG SAPON (WATER AVAILABILITY ANALYSIS OF RIVER PROGO BY USING SOIL MOISTURE ACCOUNTING MODEL HEC-HMS PROGRAM AT SAPON WEIR OUTLET)

Abstract

Population growth in Progo Basin administrative area caused the changes of land use and increased water demand. To fulfill the water demand, information about Progo River discharge analysis is needed. That water demand analysis could be done in hydrological modelling at basin. One of hydrological modelling at watershed that could be used is modelling with soil moisture accounting (SMA) model in HEC-HMS program.This research aims to get information about Progo Basin condition, to find discharge value at Progo River, and to find SMA model performance in modelling Progo Basin.The modelling period was carried out for three years, that is 2013 to 2015. Data input on the analysis carried out was land data, daily rainfall data, measured discharge data, and climatology data. The optimum parameters of the Progo watershed condition are obtained using a calibration process. Modelling results testing is done by R2 statistic parameter and Nash-Sutcliffe (NS) model efficiency. The modelling generate a comparison of the simulated discharge value and observed discharge value with a fairly good correlation number, and a fairly good value of modelling efficiency. R2 and NS efficiency values of daily water discharge simulation results respectively are 0,92 and 0,414. R2 and NS efficiency values of quarter monthly water discharge simulation results respectively are 0,980 and 0,725. R2 and NS efficiency values of monthly water discharge simulation results respectively are 0,99 and 0,815.