Irrigation Engineering
The useful storage is the volume of water stored in the reservoir between

minimum pool level and maximum pool level
minimum pool level and normal pool level
normal pool level and maximum pool level
river bed and minimum pool level

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

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

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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

All listed here
Depth of the centre of pressure is 2/3H vertically below the surface
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

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