Enter the pipe diameter, pipe material, pipe length, and total elevation change to calculate the flow velocity and mass flow rate of a gravity-fed pipe flow.

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## Pipe Flow Formula

The following formula is used to calculate the volumetric flow of water through a pipe of a certain diameter length and height.

v = k * C * R^{0.63} * S^{0.54}

- Where k is a constant (.849)
- C is the roughness coefficient (dependent on the material of pipe)
- R is the hydraulic radius
- S is the slope of the pipe
- v is the velocity of water (m/s)

From this, the mass flow rate can be determined by multiplying the volume flow rate times the density.

m= p * v

- Where p is the density of the fluid
- v is the volumetric flow rate

## Pipe Flow Definition

The pipe flow is defined as either the total mass or total volume of fluid moving through a pipe section at any point.

## How to calculate pipe flow velocity?

How to calculate pipe flow velocity.

**First, determine the roughness coefficient.**This should be available based on the material used.

**Next, determine the hydraulic radius.**Calculate the hydraulic radius.

**Next, determine the slope of the pipe.**Calculate the slope of the pipe.

**Finally, calculate the flow velocity.**Using the formula above, calculate the flow velocity.

## FAQ

**What is pipe flow?**

Pipe flow is defined as either the total mass or total volume of fluid moving through a pipe section at any point.