SOIL EROSION PREDICTION USING GIS AND REMOTE SENSING ON MANJUNTO WATERSHED BENGKULU-INDONESIA

The study aimed to assess the rate of erosion that occurred in Manjunto Watershed and financial loss using Geographic Information System and Remote Sensing. Model used to determine the erosion is E30 models. The basis for the development of this model is to integrate the slope between (NDVI). The value of NDVI was obtained from satellite imagery. Slope factor obtained through the (DEM) processing. To determine the amount of economic losses caused by erosion used the shadow prices. The amount of nutrients lost was converted to fertilizer price. The results showed that the eroded catchment area had increased significantly. The rate of average annual erosion in the watershed Manjunto in 2000 was amounted to 3 Mg ha-1 yr-1 . The average of annual erosion rate in the watershed Manjunto increased 27 Mg ha-1 yr-1 in the year 2009. Economic losses due to erosion in 2009 was Rp 200,000,- for one hectare. Total losses due to erosion for the total watershed area was Rp 15,918,213,133, -. The main factor causing the high rate of erosion was high rainfall, slope and how to grow crops that did not pay attention to the rules of conservation.