Irrigation Water Conveyance and Application Methods
Subtopic: Design and evaluation of irrigation methods
Question Statement:
The difference between advance curve and recession curve for a given surface irrigation event is known as __________.
Options:
(A) time of concentration
(B) lag time
(C) time to peak
(D) intake opportunity time
Official Answer Key:
D
Step-by-Step Solution & Explanation
In surface irrigation evaluation, two curves are plotted against distance along the field:
The advance curve — the time at which the water front reaches each point.
The recession curve — the time at which water disappears from that point.
The vertical difference between them at any station is the duration for which water actually stands on the soil surface there, i.e. the time available for infiltration. This is the intake opportunity time, and it directly governs the depth infiltrated and hence the distribution uniformity along the run.
Options (A), (B) and (C) — time of concentration, lag time and time to peak — are all hydrograph/runoff terms belonging to catchment hydrology, not to surface irrigation evaluation.
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