What term describes the total irrigation water needed to satisfy crop evapotranspiration throughout its growing season________________?
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Answer: C. consumptive irrigation requirement
Explanation
Consumptive irrigation requirement represents total crop evapotranspiration minus effective precipitation contributions. Crops require specific amounts of water that must be supplied through irrigation when rainfall is insufficient. This standard hydrological term quantifies the net irrigation water volume needed during growing seasons. Consumptive use includes water transpired by plants and evaporated from adjacent soil surfaces. Effective rainfall is the portion of total precipitation directly utilized by growing crops. Irrigation project planning relies on accurate consumptive irrigation requirement calculations.
Agricultural engineers use consumptive irrigation requirements to size farm delivery canals and pumps. Efficient irrigation scheduling matches water applications closely to net crop consumptive needs. Maximizing effective rainfall utilization reduces the demand for costly pumped irrigation water supplies. Option A effective rainfall measures usable precipitation rather than total irrigation water needed. Option B consumptive use measures total evapotranspiration without subtracting effective precipitation. Option D net irrigation requirement includes additional allowances for field application losses and leaching.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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