Hydraulic Calculator

Calculate Head Losses and Velocity

Length (L) in meters: Flow Rate (Q) in Liters per second: Pipe Material: Pipe Inside Diameter (D) in mm:

Note:

Pipe should be sized so the flow velocity within the pipe is less than 2.0 m/s for the Mainline and 1.5m/s for lateral lines. Excessive velocity can damage system and causes excessive friction loss.
The maximum allowable system losses (hf + hL) are 12.5% of nominal operating pressure.
Pipe should be sized so there is no more than a 20% drop in water pressure from the beginning to the end of the lateral as uniform pressure improves emission uniformity.