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The flow hydrograph for a catchment is as shown in the table below and the total rainfall is 15 mm from a storm of one hour duration. If the continuing loss is 5 mm/hr, what is the catchment area (km2)?
| Time (hrs) | Flow (m3/s) |
| 0 | 0 |
| 0.5 | 10 |
| 1 | 20 |
| 1.5 | 10 |
| 2 | 0 |
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