Question

An outlet irrigates an area of 20 ha. Discharge (L/s) required at this outlet to meet the evapotranspiration requirement of 20 mm occurring uniformly in 20 days neglecting other field losses

• A. 2.52
• B. 2.31
• C. 2.01
• D. 1.52

Answer 1

The correct option is B 2.31

The volume of water required for evapotranspiration
= Area × depth

$=(20\times {10}^4)(20\times {10}^{-3})$

$=4000m^3$

$V=4\times {10}^{6}l$

This volume has to be supplied in 20 days
$\therefore \text{Discharge}=\frac{V}{t}=\frac{4\times {10}^6}{20\times 86400}$

$=2.315l/s$