**Flow through a Venturi
****16-3**

In another paper I gave you the formula for computing the approximate flow through an orifice or nozzle. Here is the formula for an approximate flow through a venturi tube.

For any venturi tube use:

Or you can use:

Q = flow, in gpmd

_{1}= diameter of venturi throat, inchesd

_{2}= diameter of main pipe, inchesH = difference in head between upstream end and throat.

These formulas will work for any liquid with a viscosity similar to water.

- The values given here were for water.
- 32.174 feet/ second/ second was used for the acceleration of gravity
- 7.48 gallons/ cubic foot was used to compute the constants

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