Irrigation Engineering
For designing the venturi head,

Width of the throat should not be less than one-third of the bed width of main canal
Minimum throat width should not be less than 60 cm
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Length of the throat should be 2.5 times the depth measured to F.S.L. in the main canal

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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

Total pressure on the surface is equal to ωx̅
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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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