Computation of discharge through sluices - Under free flow condition

Unit 11 - Water distribution and control structures

Computation of discharge under free flow condition
Free discharge taking place through a monk sluice as shown in fig. can be computed by using the equation.
Fig1
g = Acceleration due to gravity 9.81m/sec2
H = Height of water (on u/s) above the central axis of the pipe (m)
D = Internal diameter of the pipe (m)
Cd = Co-efficient of discharge.

The value of Cd for the corresponding length of the pipe in terms of its diameter (D) has been given below.
Fig2

Fig3

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