Calibration and Validation of model WEAP21 for Zarrineh Rud and Simineh Rud Basins

Planning, designing and managing water resources systems today unavoidably include impact prediction. Impact prediction includes modelling. In the present study the hydrological model WEAP21 was calibrated and validated on the Zarrineh Rud and Simineh Rud Basins. Zarrineh Rud and Simineh Rud rivers with a discharge potential of 3 billion m3 per year have a 50% portion in Urmia Lake Basin. In the present study the soil moisture method was used for the hydrological simulation of model WEAP21. An 11-year statistical period (from 1994-95 to 2004-05) was planned for calibrating the model. The analysis of results of model simulation using the statistical indices showed that coefficient of determination, Nash-Sutcliffe coefficient and index of agreement for different stations were as follows, respectively: Inflow to Boukan dam hydrometry station: 0.9, 0.83, and 0.95; Nezam Abad hydrometry station: 0.75, 0.74, and 0.92; Dashband hydrometry station: 0.82, 0.81, and 0.95 and Miyandoab bridge hydrometry station: 0.75, 0.75, and 0.92. A nine-year period (from 2005-06 to 2013-14) was planned for validating the model. The analysis of results showed that coefficient of determination, Nash-Sutcliffe coefficient and index of agreement for different stations were as follows, respectively: Inflow to Boukan dam hydrometry station: 0.88, 0.85, and 0.96; Nezam Abad hydrometry station: 0.72, 0.7, and 0.91; Dashband hydrometry station: 0.86, 0.85, and 0.96; Miyandoab Bridge hydrometry station: 0.8, 0.78, and 0.93. Generally speaking, the results of simulation showed that the model had a good performance.