Sizing a Pump for a Pasture Sprinkler System with a Nelson Big Gun

A user wants to water a pasture using a Nelson Big Gun 75 sprinkler (0.6" nozzle) from a creek 600 feet away, with 5 ft suction lift, 30 ft elevation gain, and 300 ft of additional flat run. Only one sprinkler operates at a time.

Pump Selection Calculation

• Sprinkler demand: 75 GPM at 60 PSI minimum.
• Recommended pump: Berkeley B1WP 7.5 HP – delivers 75 GPM at 90 PSI at discharge.
• Pipe sizing: 3" PVC mainline keeps friction loss under 10 PSI.
• Elevation loss: ~14 PSI for 30 ft rise.
• Total dynamic head: Adequate to deliver 60+ PSI at the farthest outlet.

If a different pump brand is preferred, provide the manufacturer and a similar model can be suggested.