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. 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.
Study Area Study area is Bajaj Sagar sub catchment of Mahi basin. The Mahi river rises from the Northern slope of Vindhyan ranges in Madhya Pradesh and after flowing for about 120 km in the North-Westedy direction enters Banswara district of Rajasthan state. Total study area is 6233 sq km. Figure 1 shows the watersheds of study area. Form factor for the watersheds was also calculated.