Analysis of DAM Holder Planning (Gully Plug) for Sediment Control in Catchment Areabrantas River

Catchment Area Konto River is part of the Upper Brantas watershed, which is located in Pujon and Ngantang Regencies with an area of 236 km2. Located on.Kontoriver and many weathered areas on the mountain slopes around the reservoir. The Selorejo Dam was built in 1972 as a multipurpose dam for the supply of irrigation water, power plants, electricity and flood control. The reservoir which is planned to have a technical age reaches 100 years, but the technical life is reduced due to siltation of the reservoir. The gross storage capacity of the Selorejo Reservoir has decreased to 38.25 million m3, or 61.4% of the initial gross storage capacity of 62.30 million m3. The process of reducing capacity, moderate storage reservoirs compared with, other reservoirs in the Brantas watershed based on the results of monitoring sedimentation Selorejo Reservoir sedimentation rate of 0.72 million m3 / yr. According to Karen, action is needed to deal with this matter so that the reservoir can function optimally Measures for sediment management that have been carried out in catchment management through conservation activities, river channel management as a reduction of sediment inflow to reservoirs, through the construction of technical civil structures, namely gully plug. There are also activities that have been carried out by diverting sediment so that it does not pass through the reservoir (by pass). Reservoir sedimentation management by operations and flushing