Abstract:
Hydrological modeling has important role for designing, planning and managing any
water resource developmental project. In developing countries like India, it is more
relevant to model the river basin as discharge measurement at various locations is a
costly affair. Once a hydrologic model is calibrated for a basin, it may be used to
produce the discharge time series at any location of interest. In the present study, an
attempt has been made by using soil and water assessment tool (SWAT) model to
understand different hydrological processes occurring in Andhiyarkhor basin of
Hamp river, which is a tributary of Mahanadi river of western Chhattisgarh. Various
hydro-climatic data and spatial data were used for the study, which were collected from
different global and local databases. After data processing, the Arc-SWAT interface of
Arc-GIS was used to build up the parameters alongwith hydrologic components,
which are required in the SWAT model. The study was conducted for a period of 30
years (1984-2013). During the calibration period of 20 years (1983-2002), the model
resulted into R2, NSE, MSE, RMSE, NMSE and MAE values of 0.65, 0.50, 182.70,
13.52, 0.50 and 0.49, respectively. Similarly, during the validation period of 10 years
(2003-2013), R2, NSE, MSE, RMSE, NMSE and MAE values were calculated as 0.63,
0.40, 169.46, 13.02, 0.60 and 0.50, respectively. Sensitivity analysis of SWAT model
was performed using LH-OAT technique, and out of twelve calibrated parameters, five
parameters were found to be sensitive.
