Cattle Water System Calculator

This calculator starts from the basics of livestock hydration: herd size times average daily intake per head (12-20 gallons is typical for mature cattle) gives normal daily demand, and that figure is then multiplied by a peak-temperature factor — 1.5x for moderate heat, up to 2x or more on extreme days, since cattle drink substantially more water when temperatures climb. The recommended tank size is set to two full days of that peak demand, giving a buffer against a pump outage, a delayed refill, or an unusually hot stretch without leaving the herd short. Pipe diameter is picked with simple distance thresholds rather than a full hydraulic calculation: 1 inch for runs up to 500 feet, 1.5 inches out to 1,500 feet, and 2 inches beyond that, since friction losses over long pipe runs mean larger diameters are needed to maintain adequate flow. Elevation change independently forces the pipe size up as well — over 100 feet of rise bumps the minimum to 1.5 inches, and over 300 feet it bumps to 2 inches, because pumping water uphill adds pressure demands a narrow pipe can't meet efficiently.

Pump capacity is sized to deliver the full peak-day demand within an 8-hour pumping window, expressed in gallons per minute. These are rule-of-thumb sizings meant for ranch planning, not a substitute for an engineer's hydraulic analysis on a system with unusual layouts, multiple branch lines, or significant static lift. If your actual terrain, pipe material, or well yield differs meaningfully from typical assumptions, treat the pipe and pump numbers as first-pass sizing worth confirming with a water-system installer rather than a final spec.