Water Info

Formulas and Conversions for Water Main Design

This calculator is to find the losses in a sudden contraction or expansion. It uses the diameter of each pipe, velocity, and flow to find friciton of headloss in feet.


Find Headloss in a Sudden Contractor or Expansion

Enter a Flow through Pipe System in Gallons per Minute:

Enter a Small Diameter in Inches:

Enter a Large Diamter in Inches:

Click this button to calculate the V in feet per second:

Sudden Contraction Headloss in ft:

Sudden Enlargement Headloss in ft:

Conversion between CFM to GPM = 7.481

Conversion between Liters/min to GPM = 0.2642

Conversion between GPD to GPM = 0.0006944


Conversion between meters and feet = 3.2808

Conversion between inches and feet = 12

Conversion between mm to inches = 0.03937


C of PVC = 120

C of DI = 100