Page - 304 - in Book of Full Papers - Symposium Hydro Engineering

Location hydraulically, and 4) dredged material disposal site (riverine disposal into the river below the dam or off-stream disposal/spoil bank). Sengguruh dam located in Brantas River watershed, East Java, Indonesia was completed in 1988. The location of Sengguruh dam is shown in Figure 1. Sengguruh dam is one of the oldest dams were constructed in accordance with the Brantas River Basin Master Plan for Water Resources Development of the Brantas River Region. The objectives is for generating hydroelectric power plant with installed capacity 2 x 14,5 mW produce of 91 million kWH per year. Figure 1. Location map of Sengguruh dam Carte de localisation du barrage de Sengguruh Located at uppermost of the series dams in Brantas River Basin and therefore is utmost suffered of sedimentation. On the other hands, it prevents sediment comes to the Sutami which is the biggest reservoir and located at down stream part. The inflow come from two main rivers, namely Brantas River and Lesti River has a catchment area of 1.659 km2. Condition and sustainability functions of the reservoir currently declining due to the high rate of sedimentation. Based on the echosounding result conducted in 2016, is known that effective capacity has been reduced to 0,6 million m3, or approximately 24% of the initial conditions of 2,5 million m3 and electric generation has been reduced to 68,8 x 106 kWH. 304