Question

A field measures 40 hectares. When 8 cumecs of water was supplied for 6 hours, 30 cm of water was stored in the root zone. The field application efficiency is nearly.

• A. 70%
• B. 80%
• C. 85%
• D. 90%

Answer 1

The correct option is A 70%

Total water applied

$=8\times 3600\times 6$

$=172800m^3$

Height of water applied

$=\frac{Volumeofwater}{Area}$

$=\frac{172800}{40\times {10}^4}=0.432$

= 43.2 cm

$\therefore$ Field application efficiency

$=\frac{30}{43.2}\times 100=70\%$