Procceding Estimation Erosion Based Geographic Information System for Rating Characteristics Watershed Tabunio in the District of Tanah Laut

Abstract

Watershed Tabunio is one of the watershed in Tanah Laut District which has an important role to support the environmental aspects and socio-economic aspects, it is caused by the upstream part of the watershed there are different types of land use can increase the rate of erosion, the flow surface , Also on the middle and downstream utilized by the Tanah Laut for agriculture, plantation and fisheries. This study aims to determine the level of erosion, which is useful as a reference for determining the direction of land use for watershed restoration efforts Tabunio. This research method using a regional approach ecological watershed analysis process and presentation done spatially through Geographic Information Systems. The results showed that: a) Amount highest erosion 219,08ton / ha / yr on land unit (LU) 3B (mining land use with a gradient of 3-8%), while the lowest amount of erosion 11,44ton / ha / yr on UL 8 (use of secondary dry forest with slopes 25-40%); b) The level of erosion is very light danger land unit (LU) 8 on the use of secondary dry forest on the slope of 25 40%), while other land units at the rate of moderate to severe erosion hazard.