Water Pipe Sizing Calculator

* Required field

Livestock type Select the livestock you are sizing the water system for. Number of animals Animals using this watering point Water-line distance Feet of pipe from source to trough Maximum livestock travel to water Feet the farthest animals are expected to walk to water Elevation change Feet. Positive = uphill; negative = downhill. Available pressure PSI at the water source while flowing Flow method Choose estimate if you are unsure what flow to enter Desired flow at trough What this means: The amount of water you want arriving at the trough each minute. For example, 8 GPM means the trough receives about 8 gallons every minute while the valve is open. If you do not know your GPM, choose Help me estimate GPM above.

Advanced assumptions

Daily water target per head Gallons/head/day. The calculator loads a starting value by species; adjust for weather, size, lactation, diet, and your operation.

Calculator method

Uses elevation pressure change plus Hazen-Williams friction loss at the desired flow.

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Plan your pasture water line

Enter your system information to compare the HDPE pipe sizes available from USA Grazing Systems.

This calculator provides planning estimates only. Actual performance depends on the exact pipe dimensions, fittings, valves, water source, temperature and field conditions. Confirm final system design and product specifications with USA Grazing Systems before installation.