THE LAND CONSERVATION EFFORTS FOR WATERSHED’S HYDROLOGICAL FUNCTION

The conversion of land-use gives a dominant influence to the watershed’s hyodrological functions. The relationship between land-cover and hydrological function can be seen by the watershed’s total produced water and resistance against the peak debit at various timescales. The aims of this study was to simulate the peak discharge in some scenarios of land conservation in Awo Watershed, South Sulawesi. This study was done by rainfall frequency analysis and peak discharge predict by using the Watershed Modelling System TR 55. Input data of the model consists of: watershed area, time consentration and SCS Curve Number of land hydrological group data, land cover specification and soil moisture condition. Simulation of land use and land conservation scenarios are done on this model. The peak-disharge simulation result with 2, 5 and 10 years return period rainfall were 240.72, 804.41, and 1387.68 m3/sec. Conservation efforts by contour and terraced planting can reduce the Awo watershed’s peak discharge up to 13.50%.