Discussion
The difference between advance curve and recession curve for a given surface irrigation event is known as __________.
Answer: D
The difference is the intake opportunity time.
In surface irrigation the advance curve records when water first reaches each point along the field, and the recession curve records when water disappears from it. The time between the two at any point is how long water stands there and can infiltrate: the intake (infiltration) opportunity time. Its variation along the field governs how uniformly the water is applied.
Time of concentration, lag time and time to peak are watershed runoff terms describing a hydrograph, not the wetting interval in an irrigation event.
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