Question

A unit hydrograph for a watershed is triangular in shape with base period of 20 hours. The area of the watershed is 500 ha. What is the peak discharge in $m^3/hour$?

• A. 7000
• B. 6000
• C. 5000
• D. 4000

Answer 1

The correct option is C 5000

For this Unit Hydrograph
$\frac{Q_P{T}_B}{2}=A\times \left(\frac{1}{100}\right)$

$\Rightarrow \frac{Q_P\times 20}{2}=500\times {10}^4\times \frac{1}{100}$

$\Rightarrow Q_P=5000m^3/hr$