COMPARISON OF PERFORMANCE OF SWAT AND SIMHYD MODELS IN SIMULATION OF STREAM FLOW FROM HIDKAL DAM CATCHMENT AREA OF INDIA UNDER PRESENT AND FUTURE SCENARIOSI. Bhaskara Rao, K.V. Rao, G.V. Srinivasa Reddy, M. Nemichandrappa, B.S. Polisgowdar and M. Udaya BhanuAbstract A study was conducted to compare the performance of SWAT and SIMHYD models in prediction of stream flow from the catchment of Hidkal dam of Karnataka in India for present and future scenarios. SWAT and SIMHYD models were used for the present study and calibrated with SWAT-CUP and generic algorithm respectively. The performance of models were tested with Nash Sutcliffe Efficiency (NSE), RMSE observations standard deviation ratio (RSR), Coefficient of Determination (R2) and Per cent Bias (PBIAS). The SWAT model performed well and very good agreement between monthly observed and simulated stream flows with R2, NSE, RSR and PBIAS as 0.84, 0.76, 0.49 and 23.8% respectively during calibration periods and 0.93, 0.83, 0.41 and 22.9 % respectively during validation period. SimHYD model also performed well and the NSE and correlation coefficient was found to be 0.77 and 0.93 during calibration period and 0.90 and 0.95 during validation period respectively. This study revealed that both models performed well in simulation of monthly stream flow during calibration and validation periods. The stream flows simulated with SimHYD were compared with stream flows simulated with SWAT model and found that very good agreement between two model outputs. This study concluded that SimHYD model could be used to simulate the stream flow when data limitation. |