Analysis of land use changes effect on erosion and sedimentation potential in Progo watershed

Abstract

Abstract Progo Watershed is an ecosystem consists with Progo Rriver as the main river. One of the problems in the Progo River is the formation of sediment deposits in the downstream. The purpose of this study is to analyze the effect of land use on the erosion and sedimentation potential. Erosion prediction are based on Wischmeier and Smith’s research which presents the Universal Soil Loss Equation (USLE). In this research, the erosion and sedimentation potential has different land uses; from 1990, 2000, and then 2011. Generally, there has been an increase in the average erosion rate at Progo watershed, from 165 tons/ha/year in 1999 to 184 tons/ha/in 2011,;or if classified based on the erosion hazard level, it continues to become heavier. Sub-watersheds that have experienced a significant increase in erosion rates are Blongkeng Sub-watershed, Gemurung Sub-watershed, and Progo Hulu Sub-watershed, where the status differed from medium to heavy category. Some locations that were silting due to sediment became prone to floods.