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

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

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Irrigation Engineering
A river is said to be of

Degrading type if it cuts its bed to a certain slope
Aggrading type if it builds up its bed to a certain slope
All of these
Meandering type if it flows in sinuous curve

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