Irrigation Water Conveyance and Application Methods
Subtopic: Irrigation efficiencies
Question Statement:
In a field test of drip irrigation system having an application efficiency of 90%, the minimum, maximum and average flow rates are found to be 45 L·h⁻¹, 65 L·h⁻¹ and 50 L·h⁻¹, respectively. The manufacturer's coefficient of variation of the emitter is 0.07. If there is one emitter per plant, the drip irrigation efficiency in percent is ______. [round off to 2 decimal places]
Official Answer Key:
73.70 to 73.85
Step-by-Step Solution & Explanation
Emission Uniformity: EU = 100×[1 − 1.27·CV/√N]×(q_min/q_avg), with N=1 emitter/plant: EU = 100×[1 − 1.27×0.07]×(45/50) = 100×0.9111×0.9 = 82.0%. Overall Drip Irrigation Efficiency = EU × Application Efficiency = 0.82×0.90×100 = 73.8%.
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