Rectangular Submerged Orifices
This calculator determines the flow rate of water through a rectangular submerged orifice. This is underwater rectangular hole that water goes through. The water level on the upstream side is higher than the water level on the downstream side. Learn more about the units.
The Equation
The equation to determine the flow rate .gif){kind=small}
for a Rectangular Submerged Orifice is (U.S. Bureau of Reclamation Water Measurement Manual 1997):
Where:
= Flow Rate through the orifice (cfs).
= The cross sectional area of the open rectangular orifice in square feet (height x width).
= Height (elevation) difference between the upstream and downstream still water surfaces.