| km | Cours d'eau | % Correct |
|---|---|---|
| 192¹ | Meuse | 94%
|
| 200¹ | Escaut | 76%
|
| 92¹ | Sambre | 61%
|
| 50 | Yser | 61%
|
| 190¹ | Lys | 47%
|
| 181² | Ourthe | 45%
|
| 200¹ | Semois | 44%
|
| 103 | Senne | 43%
|
| 89 | Lesse | 40%
|
| 93 | Amblève | 30%
|
| 69 | Dendre | 30%
|
| 86 | Dyle | 30%
|
| 65 | Vesdre | 29%
|
| 117² | Nèthe | 21%
|
| 60 | Haine | 19%
|
| 85 | Démer | 18%
|
| 104² | Gette | 17%
|
| 59 | Mehaigne | 15%
|