| 流域分区 | 丰枯水年频数/% | ||||
| 丰水年 | 偏丰水年 | 平水年 | 偏枯水年 | 枯水年 | |
| MIRA | 12.5 | 20.0 | 22.5 | 35.0 | 10.0 |
| ESMERALDAS | 15.0 | 22.5 | 22.5 | 27.5 | 12.5 |
| MANABI | 12.5 | 25.0 | 17.5 | 30.0 | 15.0 |
| GUAYAS | 15.0 | 10.0 | 32.5 | 35.0 | 7.5 |
| JUBONES | 15.0 | 20.0 | 27.5 | 30.0 | 7.5 |
| PUYANGO-CATAMAYO | 12.5 | 25.0 | 17.5 | 40.0 | 5.0 |
| Pacific Ocean | 12.5 | 22.5 | 25.0 | 30.0 | 10.0 |
| NAPO | 12.5 | 15.0 | 37.5 | 25.0 | 10.0 |
| PASTAZA | 15.0 | 15.0 | 27.5 | 35.0 | 7.5 |
| SANTIAGO | 10.0 | 15.0 | 45.0 | 17.5 | 12.5 |
| Amazon River | 12.5 | 12.5 | 40.0 | 25.0 | 10.0 |
| 全国 | 15.0 | 22.5 | 12.5 | 40.0 | 10.0 |