Delta is defined as
- AGross depth of waterCorrect
- BDuty × base period
- CNet depth of water
- DArea served per unit flow
Solution
Concept
Delta is the total depth of irrigation water applied to a crop over its base period, commonly expressed in centimeters or meters.
Formula
Δ= (8.64 × B) / D
Step-by-step solution
1. Understand the definition of Delta as the total depth of water required by a crop during the base period. 2. Recognize that it refers to the gross depth of water supplied to the field. 3. Match with the given options to find the correct choice.
Explanation
Delta (Δ) is defined as the total depth of water required by a crop during its entire period of growth in the field. It represents the gross depth of water applied to the crop from sowing to harvest.
Why the other options are wrong
B: Duty × base period has no dimensional sense for depth. C: Net depth can be a component, but Delta by definition is the gross depth of water required. D: Area served per unit flow defines Duty, not Delta.
Shortcut
Remember the relation: Δ = 8.64 × Base Period / Duty.
Common mistake
Confusing Delta with Duty or Base Period.
Correct answer: A) Gross depth of water