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Soil Erosion is a universal problem as it poses great risk to cultivable land. Erosion of soil is more prominent along the regions adjacent to water bodies and in hilly areas. Present study is carried out in Noyyal River Basin, Tamil Nadu which covers 3,514 square kilometers of land. The study area lies between 10° 54’ 04” N to 11° 20’ 13” N and longitude of 76 ° 36’ 08” E to 77°56’ 16’’ E latitude. Average annual soil loss for the study area is calculated using 5 parameters of Rainfall Erosivity Factor (R), Soil Erodibility Factor (K), Slope Length and Steepness Factor (LS), Cover Management Factor (C) and Conservation Practice Factor (P) using Revised Universal Soil Loss Equation (RUSLE) Model. The soil erosion risk factor was classified into 4 risk classes of slight (0-0.5 ton/ha/year), Moderate (0.5-10 ton/ha/year), High (10-80 ton/ha/year) and Very High (>80 ton/ha/year). It was found that majority of the study area falls under the category of slight erosion and moderate erosion. The result of Annual Soil Loss obtained through GIS platform is further analyzed for prioritization of watersheds. The entire river basin was divided in 18 Sub-Watersheds. These watersheds are classified into Low (0-80 ton/ha/year), Moderate (80-180 ton/ha/year) and High (>180 ton/ha/year) Priorities based on the mean annual soil loss of the particular watershed.

PRIORITIZATION OF WATERSHED BASED ON SOIL EROSION MODEL: A CASE STUDY OF NOYYAL RIVER BASIN, TAMIL NADU