Statistical criterion | Value | Classification of performance | Reference |
Nash-Sutcliffe coefficient
| 0.75 < NSE ≤ 1.00 0.65 < NSE ≤ 0.75 0.50 < NSE ≤ 0.65 0.4 < NSE ≤ 0.50 NSE ≤ 0.4 0.4 ≤ NSE ≤ 0.70 | Very good Good Satisfactory Acceptable Unsatisfactory Acceptable | [34] [41] |
Percent bias
| PBIAS < ±10 ±10 ≤ PBIAS < ±15 ±15 ≤ PBIAS < ±25 PBIAS ≥ ±25 | Very good Good Satisfactory Unsatisfactory | [41] |
Root mean square error
| Value below half the standard deviation | Satisfactory | [45] |
Ratio of the RMSE to the standard deviation of the observations
| 0.00 ≤ RSR ≤ 0.50 0.50 < RSR ≤ 0.60 0.60 < RSR ≤ 0.70 RSR > 0.70 | Very good Good Satisfactory Unsatisfactory | [41] |