Irrigation Engineering
According to Kennedy, the critical velocity (V₀) in meters in a channel is the mean velocity which keeps the channel free from silting or scouring. Its value is given by (where m is critical velocity ratio and D is the depth of the channel).

V₀ = 0.84 mD0.54
V₀ = 0.55 mD0.54
V₀ = 0.55 mD0.64
V₀ = 0.84 mD0.64

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Irrigation Engineering
Bligh's theory of seepage assumes

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

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