Sediment control analysis due to erosion and sediment in Cipunagara watershed, Indonesia, using SWAT model

Abstract

Erosion and sediment are parameters that describe the critical level of a watershed. Cipunagara watershed is one of the most critical watershed in Indonesia. Therefore, we need a study of sediment control due to erosion and sediment. This study aims to determine the level of erosion in Cipunagara watershed, find out sediments in Cipunagara River, and determine the sediment control structure that can be applied in Cipunagara River. The method used in this research is quantitative descriptive method with modelling on SWAT. The analysis was performed using secondary data in 2005-2014. Modelling in SWAT divides Cipunagara watershed into 33 Sub Watersheds. The highest erosion value during years data occurred in Sub-watershed 18 of 654,402 tons/ha/year with very severe erosion criteria and the lowest in Sub-watershed 5 of 1,075 tons/ha/year with very mild erosion criteria. The highest sediment value is in River 25 which is 1754758.30 tons/year, and the lowest in River 7 which is 7174.40 tons/year. Sediment control in Cipunagara watershed can use check dams that place on River 18 and River 25.