Orifice ideal discharge calculator

Calculate orifice discharge and discharge with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use orifice discharge and discharge to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Orifice area (m²)
0.001
Head above orifice (m)
2
Discharge coefficient
0.62
Orifice discharge (m³/s)
0.003883
Discharge (litres/second)
3.883131

Try another scenario

Orifice area (m²)
0.0011
Head above orifice (m)
2
Discharge coefficient
0.62
Orifice discharge (m³/s)
0.004271
Discharge (litres/second)
4.271444
Calculation method

Calculation method

Orifice discharge (m³/s)

Q=Cd A sqrt(2gh), incompressible free discharge.

Discharge (litres/second)

Q=Cd A sqrt(2gh), incompressible free discharge.

Symbols and units
a
Orifice area (m²)
b
Head above orifice (m)
c
Discharge coefficient

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • Calculation uses the entered values and stated mathematical model; quantities must use the labelled units. Supported limits: All required fields must be finite values of the exact declared type and within displayed bounds. Lists contain1–1000 finite numbers. JSON tables are numeric rectangular rows, at most100 rows and30 columns; individual tools have stricter shape/domain constraints. Q=Cd A sqrt(2gh), incompressible free discharge.
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