Irrigation Water Conveyance and Application Methods
Subtopic: Irrigation scheduling
Question Statement:
Pan evaporation data recorded at a certain location over a period of one week are 4.0, 4.3, 4.6, 4.9, 5.12, 5.18, and 6.21 mm. If irrigation scheduling based on ratio of irrigation water (IW) to cumulative pan evaporation (CPE) is practiced, the depth of irrigation at an interval of a week for IW/CPE = 0.9 is
Options:
(A) 3.60
(B) 4.41
(C) 5.59
(D) 30.88
Official Answer Key:
D
Step-by-Step Solution & Explanation
Cumulative pan evaporation over the week, CPE = 4.0+4.3+4.6+4.9+5.12+5.18+6.21 = 34.31 mm.
Depth of irrigation, IW = (IW/CPE) × CPE = 0.9 × 34.31 = 30.88 mm. Answer: (D).
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