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The average rainfall for a 3 hour duration storm is 2.7 cm and the loss rate is 0.3 cm/hr. The flood hydrograph has a base flow of 20 m³/s and produces a peak flow of 210 m³/s. The peak of a 3-h unit hydrograph is
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- 125.50 m³/s
- 105.50 m³/s
- 77.77 m³/s
- 70.37 m³/s
Correct Option: B
Run off = Rainfall – losses = 2.7 – (0.3 × 3) = 1.8 cm
Peak of DRH = Peak of flood hydrograph – base flow = 210 – 20 = 190 m³/s
| Peak of 3h UH = | ||
| R |
| = | = 105.55 m³/s | |
| 1.8 |
