Question

The direct runoff hydrograph in response to a 5 cm rainfall excess in a catchment is shown in the figure. The area of the catchment (expressed in hectares) is _______

• A. 21.6

Answer 1

The correct option is A 21.6
$\frac{1}{2}\times 6\times 3600=0.05\times A$

$\Rightarrow A=21.6\times {10}^4{m}^2\Rightarrow A=21.6ha$