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