Irrigation Engineering
For a unique design of a channel by Kennedy's theory

All of these
Its breadth must only be known
Its breadth and depth ratio must only be known
Its depth must only be known

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Irrigation Engineering
If A is the area of the surface, x̅ is the depth of its C.G. from the surface of the water and ω is the density of water, then

Depth of the centre of pressure is 2/3H vertically below the surface
Depth of the point at which total pressure acts is equal to its moment of inertia divided by Ax̅
All listed here
Total pressure on the surface is equal to ωx̅

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