Direction: One hour triangular unit hydrograph of a watershed has the peak discharge of 60 m³/sec.cm at 10 hours and time base of 30 hours. The f index is 0.4 cm per hour and base flow is 15 m³/sec.
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The catchment area of the watershed is
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- 3.24 km²
- 32.4 km²
- 324 km²
- 3240 km²
Correct Option: C
Rainfall depth (excess) = 1 cm (Unit hydrograph)
Total volume = area under hydrograph
| = | × 60 × 30 × 60 × 60 | |
| 2 |
= 3.24 × 10-6 m³
A × 106 × 1 × 10-2 = 3.24 × 106
∴ A = 324 km².
