ESTIMATION OF DIRECT RUNOFF FOR PURNA RIVER SUB-BASIN, USING SCS-CN METHOD, DANGS DISTRICT, GUJARAT

Abstract

In this paper, direct surface runoff for Purna river sub-basin in the Dangs district of Gujarat, was estimated by
using Soil-Conservation Service-Curve Number (SCS-CN) method. Daily rainfall data of four rain gauge stations of study
area was analyzed. Average rainfall of sub-basin was estimated by Thiessen polygon method. Thematic maps such as Soil,
land use, geology, topography have been prepared from Liss-III and Google earth images Weighted curve number and
Antecedent Moisture Conditions have been determined using thematic maps and rainfall data in GIS environment. Runoff
depth of study area was determined by SCS-CN method.