Assessment of Surface Runoff using ArcSWAT for Rela Watershed, Rajasthan, India

Abstract

The current study based on SWAT (Soil and Water Assessment Tool) Model which coordinates the GIS data with attribute database set to assess the runoff of Rela Watershed. Soil and Water Assessment Tool (SWAT) is based on distributed parameter model which has been created to forecast runoff, sediment, erosion and nutrient transport from agrarian watersheds under various management practices. The SWAT Model works related to Arc GIS. In the current study the catchment region has been delineated utilizing the DEM (Digital Elevation Model) and afterward partitioned into 29 sub-watersheds or sub-basins. For planning of landuse map, the LANDSAT images are downloaded from earth explorer and the soil mapis obtained from NBSS (National Bureau of Soil Survey, Udaipur). The sub basins are partitioned into 29 HRUs which represents Hydrological Response Unit. At that point by utilizing 30 years of every day precipitation information and daily minimum and maximum temperature information SWAT simulation is accomplished for consistent schedule to estimate Runoff. The insights indicated diverse runoff framework esteem during the time 19.5 mm being the most minimal and 527.3 mm being the maximum runoff for Rela Watershed. The average annual runoff is 162.6 mm i.e. 28% of total rainfall in Rela Watershed.