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New Member

Posts: 14

Location: Seattle, Washington


Monday, May 24th 2021, 11:19am

Mainline Size?

I'm trying to determine the best size mainline piping for my residential irrigation system. My goal is to use a mainline size that will provide my system with sufficient and safe pressure and GPM now and for possible future expansion.

Total area to be irrigated is 7,700 SF (70% grass, 20% shrubs and 10% garden).

I'll be connecting the mainline at the 5/8" city water meter. The City reports the average pressure range at the meter (psi): Min. 77, Max 86.

The distance between meter and valves will be less than 5 feet. The City requires either a RPBA, DCVA, or PVBA.

Thank you for time and expertise.

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