Question

The field water efficiency is determined by:

(a) Water transpired by crop – water applied to a field

(b) (Water absorbed by crop ÷ water applied to a field) x 100%

(c) Water absorbed by crop – water applied to a field

(d) (Water transpired by crop ÷ water applied to a field) x 100%

This question was posed to me in an international level competition.

This intriguing question comes from Types of Irrigation in chapter Other Major Topics in Civil Engineering of Basic Civil Engineering

Answer 1

Correct choice is (d) (Water transpired by crop ÷ water applied to a field) x 100%

To explain: The field water efficiency is the way to determine if the method of irrigation is efficient. It is determined by using the formula (water transpired by crop ÷ water applied to a field) x 100%.  It is expressed in %.