ANALISA PERENCANAAN BENDUNG TETAP SUNGAI LUBUK SARIK KAMBANG KECAMATAN LENGAYANG 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. The analysis planning weir river Lubuk Sarik is planned by using mercu type Ogee while in the condition of actual use mercu type Round. The difference lies on the verge of mercu and the form of type runoff. Structure weir planned in Kecamatan Lengayang. 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 topographic maps 1:50.000 scale and rainfall data based on 10 years of observations. Weir is planned for the age of the planned 100 years. From the calculation results obtained : catchment area of 257,4 km2, discharge 100 annual (Q100) = 1921,886 m3/dt and high energy (H1) = 7,02m, so can irrigate agricultural areas covering an area of 1000 Ha. To control the stability of the water around in normal circumstances obtained = 8.94 ≥ 1.2 (secure), shear = 2.12 ≥ 1.2 (secure), eccentricity = 0.036 ≥ 3.05 (safe) and soil bearing capacity = 17.011 t/m2. To control the stability of the state around in the flood water obtained = 9.66 ≥ 1.2 (secure), shear = 1.81 ≥ 1.2 (secure), eccentricity 0.937 ≥ 3.05 (safe) and soil bearing capacity = 17.011 t/m2.
Keywords: Weir, High Energy, Type Mercu, Catchment Area.