ASSESSING THE FEASIBILITY OF A CONCEPTUAL RAINFALL RUNOFF MODEL FOR DIFFERENT FLOW CONDITIONS OVER TEL RIVER BASIN, INDIABrijesh Kumar, Wagari Ejigu Chali and Duba Chena DeroAbstract Estimation of monthly maximum and average discharge is very important for structural design and maintaining the environmental flow in the regulated rivers. In this paper an attempt has been made to apply a conceptual rainfall runoff model NAM (NedbørAffstrømnings Model) to investigate the peak and average monthly flow for flood prone Tel River basin, Odisha, India. The model was calibrated and validated based on the five years of daily data, out of which 70% of the data was used for calibration and rest 30% for validation. The model has attained very good Nash and Sutcliffe Efficiency (NSE) 0.82, Correlation Coefficient (R2) 0.84 values during calibration and also NSE 0.76, R2 0.80 during validation period. Calculation of flood peak is important in early warning at the downstream areas and thus its calculation should be very quick, realistic and with limited input data. The study has found that model is good enough in simulating the monthly peaks and monthly average discharge (R2>0.0.9) with only two input forcing. Therefore, model results can be used for structural design and management of minimum environmental flow (in case of upstream regulating reservoir) on a data deficit large catchment. |