Question

During a 6-hour storm the rainfall intensity was 0.8 cm/hr on a catchment of area $8.6k{m}^2$. The measured runoff volume during this period was $2,56,000m^3$. The total rainfall last due to infiltration, evaporation and transpiration in cm/hr is

• A. 0.80
• B. 0.304
• C. 0.496
• D. Sufficient information not available

Answer 1

The correct option is B 0.304

$\text{Rainfall depth}=0.8\times 6$
$=4.8cm$
$\text{Rainfall volume}=\frac{4.8}{100}\times 8.6\times {10}^6$
$=412800m^3$

Total volume loss in infiltration, evaporation & transpiration
$=412800-256000$
$=156800m^3$

Total rainfall loss in cm/hr
$=\frac{156800\times 100}{8.6\times {10}^6\times 6}$
$=0.304cm/hr$