💧 Hazen-Williams (C = 140-150 for C900 PVC / Ductile Iron, Headloss PSI/1000 ft)

Hazen-Williams Water Main Calculator

Size underground pressurized potable and fire water distribution mains under AWWA C900 & C151 using the Hazen-Williams empirical formula: calculate friction headloss (PSI per 1,000 ft based on flow GPM, roughness coefficient C = 150 for PVC or C = 140 for cement-mortar lined ductile iron), verify residual terminal pressure (>35 PSI), and civil water utility margins.

1. Project & Operating Inputs

Pressurized Water Main Length (Linear Feet e.g. 3,500 Linear Feet)

Peak Demand Water Flow (GPM e.g. 1,500 GPM Fire / Domestic Flow)

Customer Bid Price for Supplied & Pressure Tested Water Main ($ / Lin Ft)

AWWA C900 DR18 PVC Pipe, Gate Valves, Fire Hydrants & Pipe Crew ($ / Ft)

2. Financial Breakdown & Yield

HAZEN-WILLIAMS WATER MAINS

Turnkey Water Main Installation Profit

Municipal Water Contractor Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost