Erosion response model for watershed prioritisation in Kundapallam watershed in Nilgiris, Tamilnadu P.Rajesh Prasanna Asst Professor Jerusalem College Of Engineering, India Email: Prasanna_17@yahoo.com G.Vijay Shanker Student, B.E. (Pre Final Year) Department Of Civil Engineering, Jerusalem College Of Engineering Email: vijayshanker2020@yahoo.com Abstract The natural hydrologic processes like erosion of soil, movement of soil and its deposition in various parts of reservoir are very crucial phenomena occurring in any watershed. Erosion of soil is a very complex process which is affected by many factors and the loss caused is irreversible. Soil erosion starts from the upper reaches of watersheds and then slowly gets transported to the downstream reservoir causing the reduction in useful storage capacity of reservoir. Land and water management on watershed basis has a scientific proven base, which helps in reducing soil erosion, increasing the productivity along with proper and sustainable utilisation of resources. For larger watersheds, where the detailed soil maps are not available and preparation is costly and time consuming, a method which uses the layers derived from satellite data is most convenient. Priority of watershed depends upon various parameters. The present paper analyses the response from a watershed using Erosion Response Model (ERM). In this method vegetation density, soil brightness, slope and morphometric parameters are used for watershed prioritisation. ERM utilises drainage and slope characteristics of watershed for prioritisabon. ERM model adds the weights of each affecting parameter and calculates the response of watershed