Runoff Modelling for the Watershed Using Hydrological Model Swat Under Changing Environment

Climate change has a significant impact on water resource availability, by which the rainfall patterns also change. In the present study, a hydrological model called Soil and Water Assessment Tool (SWAT) has been used to produce a Rainfall-Runoff modeling for the study area, the Doni River, with a catchment area of 3,399.42 km2. Discharge data from 1995 to 2014 was used for calibration and validation. The calibration period was considered from 2000 to 2004 and the validation period from 2005 to 2007. The observed and simulated data results showed good model agreement with statistical performance indicators R2 and Nash Sutcliffe efficiency (NSE) values of 0.87 and 0.85 respectively. Thus, Surface runoff was influenced by sensitive parameters such as CN and ESCO, which in turn affect the subsurface parameters. It was observed that the simulated model values were well correlated with the observed values and hence effective use of the SWAT model can be achieved by its proper calibration and validation.