Question

In constructing a 4 hour synthetic unit hydrograph for a basin, the lag time is estimated to be 40 hours. When will the peak discharge in the Synthetic Unit Hydrograph occur from the start of the storm?

• A. 36 hours
• B. 40 hours
• C. 42 hours
• D. 44 hours

Answer 1

The correct option is C 42 hours

The time when the peak discharge occurs from the start of the storm may be given as
$t_{pk}=\frac{t_R}{2}+t_p=\frac{4}{2}+40=42hours$