Water flow is a calculation used for builders when determining the overall fixtures and plumbing for a building. If the building is in an area with lower water flow from the municipal pipes, then use this equation for determining the necessary pipe size for optimal water pressure.

- Skill level:
- Moderate

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### Things you need

- Calculator with pi function
- Velocity-type water meter

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## Instructions

- 1
Multiply pi by 0.25.

- 2
Press the multiply button again and enter the pipe diameter squared.

- 3
Press the multiply button again and enter the velocity of the entering water. The velocity of water is obtained by attaching a velocity-type water meter to the pipe and running the water. Lengths of time necessary for a velocity reading vary depending upon the manufacturer, so review your meter's user manual for testing requirements.

- 4
Press enter. The answer is your water's flow rate.