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

2R (θ + cos θ)
R (θ + tan θ)
R (θ + cos θ)
2R (θ + tan θ)

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Irrigation Engineering
Bligh's theory of seepage assumes

Equal weightage to the horizontal and vertical creep
Less weightage to horizontal creep than vertical creep
More weightage to horizontal creep than vertical creep
Loss of head follows the sine curve

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