| Hydrographic Region | Observed (m3/s)a | MGB-IPH/Eta-HadGEM2-ES | MGB-IPH/Eta-MIROC5 | ||||
| Baseline (m3/s) | RDR (%) | R2 | Baseline (m3/s) | RDR (%) | R2 | ||
| Solimões | 101,916.2 | 83,292.6 | 81.7 | 0.41 | 78,409.7 | 76.9 | 0.46 |
| Negro | 43,349.3 | 31,981.8 | 73.8 | 0.98 | 31,618.6 | 72.9 | 0.99 |
| Madeira | 28,452.0 | 28,368.5 | 99.7 | 0.78 | 29,589.4 | 104.0 | 0.80 |
| Xingu | 9130.8 | 15293.7 | 167.5 | 0.98 | 16,346.3 | 179.0 | 0.98 |
| Tapajós | 13167.4 | 13,246.8 | 100.6 | 0.96 | 14,708.7 | 111.7 | 0.96 |
| Northern Amazon | 21,092.6 | 29,212.0 | 138.5 | 0.92 | 30,650.5 | 145.3 | 0.94 |
| Tocantins | 13,040.5 | 10,471.0 | 80.3 | 0.97 | 13,636.6 | 104.6 | 0.96 |
| Maranhão | 3561.5 | 3627.3 | 101.8 | 0.49 | 4400.3 | 123.5 | 0.52 |
| Parnaíba | 894.2 | 707.1 | 79.1 | 0.65 | 848.7 | 94.9 | 0.61 |
| Northeast Atlantic | 671.8 | 826.7 | 123.0 | 0.49 | 842.5 | 125.4 | 0.45 |
| São Francisco | 2892.9 | 2726.1 | 94.2 | 0.99 | 2971.9 | 102.7 | 0.99 |
| East Atlantic | 1343.9 | 1571.1 | 116.9 | 0.84 | 1666.1 | 123.9 | 0.78 |
| Southeast Atlantic | 2747.4 | 2449.1 | 89.1 | 0.99 | 2728.0 | 99.3 | 0.98 |
| South Atlantic | 6194.4 | 4885.4 | 78.9 | 0.91 | 4416.6 | 71.3 | 0.92 |
| Uruguay | 8749.6 | 7790.8 | 89.0 | 0.88 | 7481.2 | 85.5 | 0.76 |
| Parana | 12,013.2 | 11,913.5 | 99.2 | 0.92 | 13,442.6 | 111.9 | 0.96 |
| Paraguay | 3242.3 | 4527.7 | 139.6 | −0.65 | 4614.6 | 142.3 | −0.55 |