Vol. 11, Special Issue 11 (2022)

Author(s):
Ajit Kumar Singh and Vikram Singh

Abstract:
Since most of the Indian watersheds are ungauged, estimation of runoff depth is one of the key parameter not only for designing engineering structures in watershed but also for prioritization of sub watersheds within the watershed. Present study was undertaken to determine the runoff depth using the USDA Soil Conservation Service curve number (SCS-CN) method in Gandak river basin in 3 stations, namely Gopalganj, Hajipur, Walminagar and Saran. The nearest stations Muzffarpur from study area also take for study. 30 years data were collected from 5 stations nearest study area for runoff calculation from NASA. Soil map were collected from National Bureau of soil Survey (NBSS), Nagpur. Satellite data for Land Use/Land Cover Map was prepared with the assist of ArcGIS. Satellite images for photographs of observed places were used, Landsat 8 data were used. From this study has been found that the maximum rainfall 151.385 mm occurred on 29th July, 1990 giving highest runoff value of 107.43 mm and the peak runoff calculated 1954.66 MCM from Gandak river outlet in year 2008-09 in last 30 years (1987-2017).