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Table 4 Summary of model performance statistics for measured and simulated the Ketar monthly and mean monthly streamflow at Abura gauging station

From: Evaluation of the WEAP model in simulating subbasin hydrology in the Central Rift Valley basin, Ethiopia

Statistics Monthly Mean monthly
Calibration period 1991–2000  
 Drainage area (ha) 327,161  
 Number of months 120  
 Mean measured flow (m3/s) 13 12.52
 Mean simulated flow (m3/s) 12.5 12.98
 Standard deviation (SD) measured 17.8 16
 Standard deviation (SD) simulated 17.2 18.2
 Coefficient of determination (R2) 0.82 0.99
 Nash-Sutcliffe coefficient (NSE) 0.80 0.97
 Index of agreement (IA) 0.95 0.99
 Root mean square error (RMSE) 7.62 6.56
 RMSE-observations standard deviation ratio (RSR) 0.44 0.15
Validation period 2001–2005  
 Number of months 60  
 Mean measured flow (m3/s) 10.4 10.4
 Mean simulated flow (m3/s) 9.6 9.6
 Standard deviation (SD) measured 14.5 13.1
 Standard deviation (SD) simulated 14.4 13.3
 Coefficient of determination (R2) 0.91 0.94
 Nash-Sutcliffe coefficient (NSE) 0.91 0.93
 Index of agreement (IA) 0.98 0.98
 Root mean square error (RMSE) 4.3 3.3
 RMSE-observations standard deviation ratio (RSR) 0.3 0.25