Aquaculture Engineering

Water control structures or Gates - Pond inlet gates 2

Unit 11 - Water distribution and control structures

Water control structures or Gates

Pond inlet gates
A typical design of open type pond inlet gate is shown in Fig. It is generally made of R.C.C. or wood. Usually two rows of grooves are made vertically in the side walls, one for mounting wooden planks or cast iron plate shutter and the other facing towards feeder canal for mounting screen shutter. Flow of water into the pond is regulated by sliding the wooden planks or cast iron plate shutter vertically up or down. The free fall discharge through open type of pond inlet gate can be computed by using the following equation.

Where,
Q = Discharge through the open type inlet gate m³/sec
b= breadth of the inlet gate or width of flow (m)
H₂=Height of pond water above the bottom or floor of the gate (m)
H₁ =Height of pond water above the top of the shutter or vent opening (m)
C_d = Discharge co-efficient value of which may be taken equal to 0.62