Question

The average surface area of a lake in the month of June was 240 ha. The volume of water evaporated from this lake during this month was found to be 42.6 ha-m. Assuming calibrated pan coefficient to be 0.8, the pan evaporation during this month would be_____mm/day (round off to 1 decimal place).

• A. 7.4

Answer 1

The correct option is A 7.4
$V_E=A\times C_P\times E_P$

$42.6\times {10}^4=240\times {10}^4\times 0.8\times E_P$

$E_P=0.221875m/month$

$E_P=\frac{0.221875\times {10}^3}{30}$

$E_P=7.4mm/day$