Irrigation Water Conveyance and Application Methods
Subtopic: Irrigation efficiencies
Question Statement:
A stream of 200 L s⁻¹ is diverted from a canal to irrigate a wheat field in 8 hours. If the runoff from the field is 500 m³ and the conveyance efficiency is 75%, the application efficiency in per cent is ________. [round off to two decimal places]
Official Answer Key:
88.40 to 88.50
Step-by-Step Solution & Explanation
• Volume diverted = 200 L/s × 8×3600 s = 5,760,000 L = 5760 m³
• Volume delivered to field = 5760 × 0.75 (conveyance efficiency) = 4320 m³
• Volume stored in root zone = delivered − runoff = 4320 − 500 = 3820 m³
• Application efficiency = 3820/4320 × 100 = 88.43%
Computed value: 88.43% (within official range 88.40–88.50)
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