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Estimation of Surface Runoff using NRCS Curve number procedure in Buriganga Watershed, Assam, India - A Geospatial Approach

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Author Affiliations

  • 1ASTEC, Guwahati, INDIA
  • 2 Geography Department, Cotton College, Guwahati, INDIA

Int. Res. J. Earth Sci., Volume 2, Issue (5), Pages 1-7, June,25 (2014)

Abstract

Estimation of surface runoff using Natural Resources Conservation Service - Curve Number (NRCS-CN) is one of the most widely used method. The GIS and remote sensing techniques facilitate accurate estimation of surface runoff from watershed. In the present study an attempted has been made to evaluate the applicability off Natural Resources Service Curve Number method using GIS and Remote sensing technique in a micro watershed Buriganga, Assam. In the study, hydrologic soil groups, land use and slope map bas been generated using GIS tools. Further, hydrological modeling in GIS with the aid of Remote Sensing technology is a powerful tool for system investigation of runoff generation in geo-hydrologic environment. To generate CN values map, the CN values from NRCS Standard Tables were allotted to intersected hydrologic soil groups and land use maps and then to estimate runoff depth for selected storm events in the micro watershed. The results of NRCS-CN method in runoff estimate can be used in humid watersheds management and conservation purposes.

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