Statistical criterion | Equations | Values | Classification of Performance | References |
NSE |
| 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 | [53] |
R2 |
| R2>0.5 | R2 values > 0.5 are regarded as acceptable for model simulation | [54] |
PBIAS |
| PBIAS < ±10 ±10 ≤ PBIAS < ±15 ±15 ≤ PBIAS < ±25 PBIAS ≥ ±25 | Very good Good Satisfactory Unsatisfactory | [55] |
RMSE |
| Value below half the standard deviation | Satisfactory | [56] |
RSR |
| 0.00 ≤ RSR ≤ 0.50 0.50 < RSR ≤ 0.60 0.60 < RSR ≤ 0.70 RSR > 0.70 | Very good Good Satisfactory Unsatisfactory | [57] |