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

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

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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
Length of the throat should be 2.5 times the depth measured to F.S.L. in the main canal
All listed here

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