Irrigation Engineering
If straight sides of a triangular section of a lined canal with circular bottom of radius R, make an angle θ with horizontal, the area of its cross-section, is

R (θ + cot θ)
R2 (θ + cot θ)
R (θ + tan θ)
R2 (θ + tan θ)

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Irrigation Engineering
For a standing crop, the consumptive use of water is equal to the depth of water

Used by the crop in transpiration, evaporation and also the quantity of water evaporated from adjacent soil
Transpired by the crop
Transpired and evaporated by the crop
Evaporated by the crop

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