| Catchment | Rainfall (mm) | Runoff Volume (106 L) | Change in runoff volume | |||
| NBS Scenario 1 | NBS Scenario 2 | NBS Scenario 3 | NBS Scenario 4 | |||
| Subarea 1 | 10.69 | 10.67 | −6.4% | −47.9% | −31.6% | −15.6% |
| Subarea 2 | 10.69 | 9.21 | −6.5% | −47.8% | −31.5% | −15.5% |
| Subarea 3 | 10.69 | 13.92 | −6.1% | −52.2% | −36.3% | −20.5% |
| Subarea 4 | 10.69 | 18.57 | −6.1% | −49.5% | −33.0% | −16.4% |
| Subarea 5 | 10.69 | 6.09 | −6.2% | −49.9% | −33.2% | −16.6% |
| Subarea 6 | 10.69 | 4.64 | −9.4% | −49.7% | −33.0% | −16.5% |
| System area | 10.69 | 54.87 | −5.3% | −46.0% | −30.6% | −15.3% |