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Estimation of runoff for agricultural watershed using SCS curve number and geographic information system  Ashish Pandey Lecturer, Agricultural Engineering,Soil and Water Conservation Engineering, Watershed Modeling using RS and GIS E-mail: apandey@ nerist.ernet.in, p.ashish@lycos.com  P. P. Dabral Assistant Professor, Agricultural Engineering, Soil and Water Conservation Engineering, Watershed Hydrology E-mail:ppd@nerist.ernet.in Phone: +91-360-257401-5 Ext. 6210 (O), +91-360-257 357 (R) Fax: +91-360-244 307 (O) Department of Agricultural Engineering, NERIST, Nirjuli, Itanagar, Arunachal Pradesh India-791 109, V.M. Chowdary Regional Remote Sensing and Service Centre, Kharagpur B.C.Mal Department of Agricultural and Food Engineering, IIT, Kharagpur, India-721 302 Abstract Soil Conservation Service (SCS) model has been applied in the present study for the estimation of runoff from an agricultural watershed. The Karso watershed is about 2793 ha, is a part of Damodar Barakar catchment, which is situated in Hazaribagh district of Jharkhand State. This method involves various types of information related to Hydrologic soil Group, vegetation and antecedent moisture condition of the watershed. The soil map, land use map have been prepared by the information available at Soil Conservation Department, Damaodar Valley Corporation, Hazaribagh and topographical maps were collected from Survey of India, Calcutta. ERDAS IMAGINE-8.4 software was used for the rectification of reference map, soil map and land use map of the watershed. The vector layers were generated in ARC/INFO and used as input to derive modified Soil Conservation Service (SCS) Curve Number for study area. The SCS model was then applied to estimate the runoff for daily storm and was validated comparing it with the measured runoff of few selected events of monsoon period for the year 1993. |