Its primary function is to reduce the velocity of discharged water to minimize the loss of kinetic energy at the outlet.
2.
From the equation of continuity it is evident that for area of cross section being constant, discharge is maximum when the velocity of discharge is maximum . and from Ch�zy formula and Manning formula for a certain value of slope and surface roughness velocity is maximum when the hydraulic radius is maximum . and if we take area as constant hydraulic radius is maximum if the wetted perimeter is minimum.
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