| Catchment area | Flood flow | Base flow | Total |
| Yarmouk (at Adasiya) | 182 | 218 | 400 |
| El-Arab | 6.48 | 24.90 | 31.38 |
| Ziqlab | 2.2 | 8.3 | 10.5 |
| Yabis | 1.63 | 6.2 | 7.83 |
| El-Jurm | 0.23 | 11.5 | 11.73 |
| Rajib | 1.31 | 3.0 | 4.31 |
| Kufranja | 1.02 | 5.8 | 6.82 |
| Shueib | 1.77 | 8.0 | 9.77 |
| Kafrain | 1.35 | 12.0 | 13.35 |
| Hisban | 0,34 | 6.3 | 6.64 |
| Zerka | 46.52 | 48.3 | 94.82 |
| Inter-catchment areas |
|
|
|
| Arab & Ziqlab (AB21) | 5 | 1 | 6 |
| Ziqlab & Jurm (AB22) | 3 | 1.5 | 4.8 |
| Jurm & Yabis (AB23) | 1.5 | 0.0 | 1.5 |
| Yabis & Kufranja (AB24) | 0.1 | 1.3 | 1.4 |
| Kufranja & Rajib (AB) | 0.2 | 1.2 | 1.4 |
| Rajib & Zerka (AB10) | 0.1 | 0.3 | 0.4 |
| Zerka & Shueib (AB25) | 3.5 | 0.0 | 3.8 |
| Shueib & Kafrain | 2 | 0.4 | 2.4 |
| Kafrain & Hisban (AB26) | 0.0 | 1.3 | 1.3 |
| Hisban & Udheimi (AP2) | 0.34 | 0.3 | 0.64 |