The duty of water in irrigation refers to
- AThe area irrigated per unit volume of waterCorrect
- BThe amount of rainfall in a season
- CThe efficiency of a canal system
- DThe number of crops grown
Solution
Concept
Definition of duty
Formula
Duty = area irrigated per cumec of water (hectares/cumec)
Step-by-step solution
1. Duty is the area that can be irrigated by a unit discharge (1 cumec) running for the crop base period.
Explanation
Duty relates the irrigated area to the quantity of water. A higher duty means each unit of water irrigates more land. Delta (depth of water) is related by Δ = 8.64 B / D.
Shortcut
Duty = area per cumec; Δ = 8.64 B/D.
Common mistake
Confusing duty with delta.
Correct answer: A) The area irrigated per unit volume of water