Question

The rainfall on 5 successive days in a catchment was 2, 7, 8, 4 and 3 cm. If the $\varphi -index$ for the storm is 3 cm/day,the total direct run-off volume generated from a $195k{m}^2$ catchment is

• A. $19.5M{m}^3$
• B. $23.4M{m}^3$
• C. $15.6M{m}^3$
• D. $32.5M{m}^3$

Answer 1

The correct option is A $19.5M{m}^3$

Total direct runoff
$=(7-3)+(8-3)+(4-3)$
$=10cm$

So, Volume generated
$=\frac{10}{100}\times 195\times {10}^6{m}^3$

$=19.5\times {10}^6{m}^3=19.5M{m}^3$