Irrigation Water Conveyance and Application Methods
Subtopic: Irrigation efficiencies
Question Statement:
A flow of 150 L s⁻¹ was supplied for 8 hours from a tank to irrigate 2 ha of land. It was found that the actual delivery rate at the farm was less than 150 L s⁻¹. If the conveyance loss was 864 m³ and percolation and runoff losses in the field were 240 and 760 m³ respectively, the water application efficiency of this system is
Options:
(A) 80%
(B) 61%
(C) 77%
(D) 71%
Official Answer Key:
D
Step-by-Step Solution & Explanation
Volume released at source = 0.150 m³/s × 8×3600 s = 4320 m³. Volume reaching the farm (after conveyance loss) = 4320 − 864 = 3456 m³. Water stored in the root zone = 3456 − 240 (percolation) − 760 (runoff) = 2456 m³. Water application efficiency = (water stored in root zone)/(water delivered to the field) × 100 = 2456/3456 × 100 = 71.1%.
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