Direction: The drainage area of a watershed is 50 km². The φ index is 0.5 cm/hour and the base flow at the outlet is 10 m³/s. One hour unit hydrograph (unit depth = 1 cm) of the watershed is triangular in shape with a time base of 15 hours. The peak ordinate occurs at 5 hours.
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For a storm of depth of 5.5 cm and duration of 1 hour, the peak ordinate (in m³/s) of the hydrograph is
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- 55.00
- 82.60
- 92.60
- 102.60
Correct Option: C
For 1 cm depth, peak ordinate, Q0 = 18.52 m³/s
∴ For sum, Q = 18.52 × 5 = 92.6 m³/s.
