• Bhumika Mistry

For the effective management of water resources, an accurate understanding of hydrological behavior of an area is very important. Runoff is the most basic and important parameter needed for planning of water management strategies. The Soil Conservation Service Curve Number (SCS-CN) method is one of the popular method to determine the depth of surface run-off. The method takes into account the important parameters in the catchment such as rainfall, soil moisture content, land use -land cover, soil type, topography, size and shape of watershed,. etc. The present study focuses on determining the SCS-CN method with the help of MATLAB tool for the Lower Tapi river basin area of study is about 1600 km2 located in the western part of India. The geographical location of the Tapi river basin lies between 72°33’ to 78°17’ east longitudes and latitudes 20°to 22° north latitude approximately .Lower part of the Tapi River Basin is prone to flood hazard due to its location between coast and Ukai dam, metrological conditions, low lying topography, inadequate natural and manmade drainage and sudden occasional heavy release of flood water from Kakrapar weir . Remote Sensing and Geographic Information System (GIS) are emerging very powerful tools for analyzing spatial distributed information. In these study satellite images of IRS-P6 LISS-III images have been used. Various thematic layers such as Soil, land use, slope have been generated in GIS environment. The curve number (CN) polygon wise has been estimated using a combination of land use, soil, and antecedent soil moisture condition (AMC).The original soil map has been converted to a map of Hydrologic Soil Groups (HSG). Weighted area curve number has been determined in order to find a representative curve number by integrating attributes of various thematic layers in Arc GIS 10.5 using the areas of different land cover and soil types as weighting factor. Study reveals that SCS-CN method coupled with Remote Sensing and GIS is capable of simulating runoff pattern and runoff volume successfully for Lower tapi basin.

SCS –CN Method, ArcGIS, MATLAB, Rainfall-Runoff Model , Lower tapi River Basin.

"RAINFALL-RUNOFF MODELLING USING SCS-CN METHOD FOR LOWER TAPI RIVER BASIN", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.10, Issue 1, page no.b312-b326, January-2023, Available :http://www.jetir.org/papers/JETIR2301150.pdf

"RAINFALL-RUNOFF MODELLING USING SCS-CN METHOD FOR LOWER TAPI RIVER BASIN", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.10, Issue 1, page no. ppb312-b326, January-2023, Available at : http://www.jetir.org/papers/JETIR2301150.pdf