International Journal of Civil Engineering

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PREDICTION OF LAND EROSION BY USLE METHOD IN DIBAWAH LAKE CATCHMENT AREAS, SOLOK REGENCY
(Horizon Research Publishing, 2019) Siddiq, Raden Herdian Bayu Ash
The Government of West Sumatra functioned Dibawah Lake as a tourist area. Besides that, it is also used as an irrigation water source. Location of the Dibawah Lake, which is in the highlands with slope levels between 28% - 40% gives rise to the potential for land erosion in the lake catchment area, which is quite high. This study aims to predict the magnitude of land erosion, sediment delivery ratio and sedimentation rate in lake bodies using topographic spatial analysis and the USLE (Universal Soil Loss Equation) method. From the results of the analysis, it was found that the Dibawah Lake Catchment Area reached 2881.7 ha, which was divided into 27 sub-catchments. The rainfall erosivity value (R) of the Dibawah Lake catchment area is 8219.46 mm. The types of soils in the Dibawah Lake catchment area are cambisols and Andosols with soil erodibility values (K) 0.22 and 0.20. The slope average of the Dibawah lake catchment area is 28% - 40%. The total land erosion in the Dibawah Lake catchment area is 1061.36 tons/ year. The Sediment Delivery Ratio (SDR) of the Dibawah Lake catchment area is 31.08%. With an SDR value of 31.08%, the sedimentation rate in the Dibawah Lake body is 329.85 tons/ year.