Open AccessAssessment of Performance Wonogiri Dam in Service of Water Needs Due to The Impact of Erosion and Sedimentation
Author(s) -
Ari Murdhianti,
B. Sri Wahyu Kusumastuti,
C. Lily Montarcih,
D. Pitojo Tri Juwono,
E. Sisinggih Dian
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/641/1/012003
Subject(s) - sedimentation , watershed , erosion , hydrology (agriculture) , dredging , environmental science , hydroelectricity , flood myth , erosion control , water resource management , sediment , geography , geology , engineering , geotechnical engineering , computer science , paleontology , oceanography , archaeology , machine learning , electrical engineering
Wonogiri Dam administratively located in Wonogiri Regency exactly in the upper reaches of Bengawan Solo Watershed. Wonogiri Dam is a multipurpose dam which is used as irrigation, raw water, hydroelectric power plant and flood control. The high impact of erosion and sedimentation became main issue in Wonogiri Dam caused by changes in land use at upstream area. Within 25 years the capacity of Wonogiri Reservoir was reduced by 65 million m 3 from 440 million m 3 in 1980 to 375 m 3 in 2005 as recorded. One of parameter that used for assessment of the dam performance depends on erosion and sedimentation. This study aims to determine assessment of performance Wonogiri Dam in service of water needs due to erosion and sedimentation. Erosion and sedimentation analysis can be determined by using USLE (Universal Soil Loss Equation) and SRD (Sedimen Delivery Ratio) methods. As the result showed that erosion in Wonogiri Watershed has high erosion potential which gain 3,2 million m 3 /year. The Keduang Sub Watershed shows the highest level of erosion potential, which is between 1.175 million m 3 /year. The sedimentation rate result in Wonogiri Dam considered relatively high with rate value 1,948,000 m 3 /year. There for it is necessary that a comprehensive sedimentation management system is needed in the Wonogiri Watershed from both side, in technical and non technical aspect, such as reforestation or dredging activities. Based on the results of the analysis of the impact of erosion and sedimentation, it can be concluded that the performance evaluation of the Wonogiri Dam is include in the sufficient category because many activities have been carried out to restore the reservoir function to its original condition.