Perencanaan Penggunaan Lahan Di Daerah Tangkapan Air (DTA) Waduk Batutegi Untuk Mengurangi Sedimentasi

Abstract

. Reservoir has various functions such as water sources for irrigation and domestic, hydro electrical power plant and a tourism. Given the importance of reservoir function, management of catchment areas of reservoirs should be done properly. Land use changes will greatly affect the condition of the reservoir. Common problems that often occur when land use is not based on land capability and suitability, and there is no soil and water conservation efforts, were increased surface erosion resulting the high sedimentation in the reservoir. This paper presented an overview of land use planning in Way Jantan Sub Watershed as a reservoir Batutegi catchment area.The results showed that land use is a major factor that determine the transported sediment into rivers and reservoirs. The increase of precipitation and rainfall erosivity (EI30) can increase the amount of runoff and sediment in the Batutegi reservoir. While the land use change of shrubs, mix garden, and coffee plantations into forests can reduce sediment in reservoirs. To reduce reservoir sedimentation of Batutegi, the proposed land use planning that is 13-16% of the total area of Way Jantan sub watershed such as 79% of annual crops (coffee), 5% of rice field, 8% of shrubs, 4% of forest and settlements respectively. Prediction models to assess surface runoff, sediment, and erosion attributed by land use changes can be used as basis for land use planning in the catchment area of reservoir