1. SUJAY K - Department of Civil Engineering, KLE Institute of Technology, Hubballi, Vishveshvaraya Technological
University, Belagavi, Karnataka, India.
2. V. S. HEGDE - Department of Civil Engineering, Karnataka Law Society’s Vishvanathrao Deshpande Institute of
Technology, Haliyal, Visvesvaraya Technological University, Belagavi, Karnataka, India.
Department of Civil Engineering, Sri Dharmasthala Manjunatheshwara College of Engineering and
Technology, Dharwad, Visvesvaraya Technological University, Belagavi, Karnataka, India.
Department of Civil Engineering, National Institute of Advanced Studies, II.Sc, Bangalore, Karnataka, India.
Understanding the risks associated with soil erosion and drainage patterns is essential for agricultural output. In the research 9 sub-watersheds of the Bennihalla catchment located in semi-arid regions is studied to priorities for soil erosion-threat through morphometric investigation with the help of Geospatial methods and weighted sum approaches (WSA). ArcGIS was used to build drainage networks; SRTM DEM to delineate sub-watersheds and morphometric parameters (linear, relief and area) following standard formulas. The said parameters used to rank and prioritize sub-watersheds. A weighted sum approach (WSA) and cross-correlation of 18 morphometric parameters were used to approximate the compound factor. The compound factors for various sub-watersheds ranged from 0.0052 to 4.412. Lowest compound factor was given the highest priority. Sub-watersheds were classified as very good, good, moderate, low, and very low according to their compound factor value. The results indicated that, SW1 and SW 9 are influenced by respectively lowest and highest soil erosion threats, the other sub watershed that also need. Soil conservation measures include .SW7, and SW5 (1980.67 km2 area).
Drainage Basin Analysis. Bennihalla Watershed. Soil Conservation, Erosion; Prioritization of Sub Watersheds.