Abstract
Jatigede Reservoir serves to control floods in Indramayu area. The reservoir irrigate rice fields by 90,000 ha, supply raw water for clean water by approximately 3,500 l/sec, and produce electricity by 110 MW. Yet, the condition of the Cimanuk watershed is reported in a critical situation. It was characterized by high soil erosion and high fluctuations in river discharge. This study aims to evaluate the sedimentation and river flows that entering the Jatigede Reservoir. The rainfall-runoff simulation determined by SWAT (Soil and Water Assessment Tools) on Jatigede Reservoir is based on existing land use. According to SWAT, it showed the possibility of current land use on annual crop and garden land which is carried out some conservative measurements, such as terrace, grass strip, and ditch and also building area that constructed an infiltration well would reduce the sediment yield from around 9.05 to 5.96 million tons per year. Not only that, but also runoff will decline from 99.7 to 75.8 mm per year. If the measurements are based on land use according to the 2011-2030 Spatial Plans of Garut Regency and Sumedang Regency, the sediment yield can be reduced to 4.97 million tons per year and runoff which become 97.6 mm per year. However, if the environmental degradation of the Cimanuk watershed is allowed to continuously increase that is marked by changes in uncontrolled land use, it will raise the sediment yield and runoff by about twice as the current conditions, so that it can threaten the sustainability of the function of Jatigede Reservoir.
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