Aquaculture Engineering

Computation of discharge through sluices - Submerged flow condition

Unit 11 - Water distribution and control structures

Water control structures or Gates
Computation of discharge through sluices

Submerged flow condition
Discharge through a monk sluice whose outlet pipe is under water can be computed by using the equation.

Discharge under submerged condition taking place through an open sluice can be computed by using the equation.

Value of co-efficient of discharge C_d for a submerged flow condition may be taken one percent less than its value for the same sluice under the same effective head when discharging freely into the air (i.e., free flow condition). For sluice opening provided with cut waters and wing walls value of C_d is taken between 0.9 and 0.95. For head sluice this value is usually taken as 0.80.