Seite - 223 - in Book of Full Papers - Symposium Hydro Engineering

In the normally calculation of the PMF discharge can only represent the annual value. If this value is applied to the reservoir operation to maintain CWL it will cause a big losses. Because the volume of water that can be utilized must be wasted to maintain the CWL. Probability of PMF discharge is different for every month. Therefore it is necessary to do research to get the value of PMF discharge for each month to get different CWL for each month. 2. METODOLOGY 2.1. DESCRIPTION OF STUDY AREA Topographic conditions in Malang Regency are dominated by highland or mountainous areas. With such topographical conditions, it is possible to build dams as regulators for water regulator and flood control. There are three dams in the upstream of Brantas River Basin: Sengguruh Dam, Sutami Dam and Lahor Dam, which are interrelated systems. Sengguruh Dam serves as a power plant and sediment controller, so that sediment sediments do not go directly into the Sutami Reservoir. The Sutami and Lahor Reservoirs are interconnected with tunnel, which in the planning of the Lahor Reservoir serves to supply the water needs to the Sutami Reservoir for hydroelectric power plant. Fig. 1 Dam Location and Chatchment Area Scheme LAHOR DAM Flood control, supply for hydroelectric power plant, supply for irrigation, tourism object SUTAMI DAM Flood control, raw water supply, hydroelectric power plant, supply for irrigation, tourism object SENGGURUH DAM Sediment controlled, hydroelectric power plant 1659 km2 393 km2 160 km2 223