💧 Hazen-Williams (C=150), 2"-4" Class 200 PVC Mainline Pressure Drop & Velocity

Commercial Irrigation Mainline Friction Calculator

Size commercial landscape irrigation supply mainlines using the Hazen-Williams friction equation: calculate pressure drop (PSI per 100 ft in 2", 2-1/2", 3", and 4" Class 200 / SDR-21 PVC pipe at water velocities <5.0 FPS preventing water hammer surges), total dynamic head, and irrigation contractor margins.

1. Project & Operating Inputs

Mainline Pipe Length (Linear Feet e.g. 2,400 Linear Feet)

Design Peak Flow Rate (Gallons / Minute - GPM e.g. 120 GPM)

Customer Bid Price for Mainline Trenching & Pipe ($ / Lin Ft)

Class 200 PVC, Ductile Iron Fittings, Thrust Blocks, Trenching Crew ($ / Ft)

2. Financial Breakdown & Yield

HAZEN-WILLIAMS IRRIGATION MAINLINE

Turnkey Mainline Package Profit

Commercial Irrigation Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost