Simulation of runoff in Baitarani basin using composite and distributed curve number approaches in HEC-HMS model

The present study was conducted in Baitarani basin up to Anandapur gauging station of Odisha covering an area 8603.7 km2. Pre-processing from digital elevation model (DEM) done using HEC-Geo-HMS extension and spatial analyst tool ArcGIS. These pre-processed files were then imported HEC-HMS for simulating runoff. In this study, runoff simulation two methods, viz., composite distributed curve number (CN) approaches. SCS method used computation volume, UH direct runoff, constant- monthly varying base flow Muskingum routing. calibrated validated both CN Data 1st January, 2007 31st December, 2013 calibration 2014 2016 validation. During the period approach, statistical parameters like Nash-Sutcliffe efficiency (NSE), Coefficient determination (R2), Percent bias (PBIAS) RMSE-observations standard deviation ratio (RSR) found be 0.51, 0.63, 12.82 0.7, respectively during validation they 0.53, 0.54, -19.73 respectively. case NSE, R2, PBIAS RSR 0.62, -8.64 0.6, 0.67, 0.66, -2.25 period. indicated that approach is more accurate than model.