Page - 987 - in Book of Full Papers - Symposium Hydro Engineering

Indonesia is the country that has huge water availability, it is about 3,909.6 billion m3/year about 2530 km3 (no. 5th water resources in the world). Although Indonesia include 10 water-rich country, but because of the season variations and spatial imbalances in water availability, requires good management of water resources availability specially in dry season such as constructing dam. Beside having many benefits, dams construction also keep potential hazards that can endanger the lives at the downstream. The dams failure can cause major flooding and damage in the downstream area. In accordance with Minister Regulation No. 27 / PRT / M / 2015 on Dams, dam safety role is intended to realize the orderly development and utilization of dams so be worthy of a technical or non-technical aspects from the design, construction, operation, decommissioning stages in order to prevent or reduce the potential failure risk of the dams construction with criterias are as follow: a. Dam with 15 (fifteen) meters height or more, measured from the deepest foundation; b. Dam with 10 (ten) meters height up to 15 (fifteen) meters, measured from the deepest foundation with the following provisions: 1) The length of the dam crest at least 500 (five hundred) meters; 2) The capacity of the reservoir at least 500,000 (five hundred thousand) cubic meters; or 3) Maximum flood discharge at least 1,000 (one thousand) cubic meters per second; or c. Dams with special difficulty on the foundation or dams designed with new technology and / or dams that have high hazard classification. 2. DAM DEVELOPMENT IN INDONESIA Many dams in Indonesia are very old. It was built before Mid 80’s, some dams were even built before 1950, during the colonial time. Based on Minister Regulation No. 27 / PRT / M / 2015 on Dams, Indonesia has 214 dams are categorized as large dam until 2017. The latest dams that are on going in 2017/2018 are: 1. Bener Dam, Yogyakarta 2. Semantok Dam, East Java 3. Temef Dam, East Nusa Tenggara 4. Tigadihaji Dam, South Sumatera 5. Pamukkulu Dam, South Sulawesi 6. Margatiga Dam, Lampung 7. Sidan Dam, Bali 987