Comparison and Extraction of Watershed Using Arc Swat and Arc Hydro from High Resolution Digital Elevation Model

摘要

The watershed modelling is carried out using two different modelling modules for extraction of streams and associated watershed area. Arc swat tool from SWAT and Arc hydro tool are used for watershed modelling. High resolution Cartosat-1 DEM with 10mresolution is used to delineate the accurate watershed. The study aims in modelling two different watersheds using two different modules with same dataset provided for modelling. Both modules provide different way of processing the DEM and extraction ofwatershed. The performance of both Arcswat and Archydro differs in watershed extraction. The Arcswat module allows to integrate information such as land use and soil type and optimal for small watershed studies. Arcswat automatically performs operationswhile Archydro provides manual options for extraction of watershed. Archydro tools are optimal for large watershed studies and easy for managing datasets for modelling. The study also includes three dimensional watershed analysis by deriving contours, TIN model and draping of stream networks over the terrain surface using satellite imagery as base layers.