WEIR PLANNING AND EQUIPMENT STEM RIVER LUMPO II KECAMATAN IV JURAI KABUPATEN PESISIR SELATAN

Abstract

Weir is transverse building river serves to elevate water to be taken down and streamed to a channel through the building retrieval. Planning stem river weir Lumpo II is planned to use the summit to the conditions of Geology Ogee type of irrigation area is relatively young or can not be said to be stable. In making this Final Task performed the calculations such as hydrological analysis, calculation hidrolis weir, calculation dimensions weir and calculation stability weir. Supporting data is 1:50,000 scale topographic maps and rainfall data based on 15 years of observations. Weir is planned for the age of the planned 100 years. From the calculation results obtained: wide catchment area of 84 km2, 100 annual discharge (Q100) = 775.3776 m3/sec. Width weir 38,4 m, weir 4.5 m high summit and high-energy (H1) = 4.815 m, so as to irrigate an area of 779.00 hectares of agricultural area. In the calculation of dam stability in normal water conditions obtained safety factor against sliding bolsters 2.117 and 1.711. Water during flood conditions obtained safety factor against sliding bolsters 2,817 and 1,957. The importance of the construction of the dam is stable.
Keywords: Weir, High Energy, Type Mercu, Catchment Area.