Selecting Rotary Heads and Pipe Sizing for a 110' x 100' Front Lawn

Designing a rotor system for a flat 110' x 100' lawn with 70 PSI, 5/8" meter, 3/4" copper supply, and 8 GPM available. Goal: 45-50' radius, minimal zones, 1" mainline.

Reality Check on Rotor Radius

At 8 GPM, 45-50' radius is not achievable with standard residential rotors. Nozzles that throw that far require 6-10 GPM each, limiting you to one head per zone. Realistic radius at 2.5 GPM nozzles is 35-40 feet.

Recommended Rotors

• Rain Bird 5000
• Hunter PGP
• Toro 800 Series
• K-Rain K1
• Orbit Rotor

Select the nozzle closest to 2.5 GPM for each model.

Zone Capacity

With 8 GPM and 1" pipe (max ~15-18 GPM at acceptable velocity), you can run 3-4 rotors per zone. Use larger nozzles on 360° heads (they cover twice the area of 180° heads). 1" mainline is sufficient for the entire system.