Hydraulics and Fluid Mechanics in ME
In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by

Some other alterations in the impeller
Trimming the impeller size to the required size by machining
Designing new impeller
Not possible

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Hydraulics and Fluid Mechanics in ME
The discharge over a rectangular weir, considering the velocity of approach, is (whereH1 = H + Ha = Total height of water above the weir, H = Height of water over the crest of the weir, and Ha = Height of water due to velocity of approach)

(2/3) Cd × L. √2g [H13/2 - Ha3/2]
(2/3) Cd × L.√2g [H1 - Ha]
(2/3) Cd × L.√2g [H12 - Ha2]
(2/3) Cd × L. √2g [H15/2 - Ha5/2]

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