Studi Tingkat Bahaya Erosi dan Pengaruhnya terhadap Kualitas Air (Tss dan TDS) DAS Sejorong, Kecamatan Sekongkang Kabupaten Sumbawa Barat Provinsi Nusa Tenggara Barat

The purposes of this research are to study the degree of erosion hazard and its influence on water quality in Sejorong watershed. Survey method was used in this research. The locations of soil sampling were divided into two locations that are native and disturbed areas. Soil samples were taken on 4 locations. Water samples were taken on 2 locations which lying from upstream and downstream. The degree of erosion hazard known by combining the surface erosion estimated using USLE from Wischmeier and Smith (1978) and the depth of the soil. The result of this research had shown that the surface erosion ranging from 0.21 to 6.916.3 t/a/year. The most of surface erosion and the degree of erosion hazard occurred in Jalit I. The analyze of water quality showed that Jalit WI, that located near Jalit I and Jalit II, has the highest TDS, that is 2500 mg/l