New long water main help

[volscrazy65]

I have to run a water main that's 1500' long with 250' in elevation gain with 180 psi at the meter. I was told by a septic tank guy wanting to run the water line that I'll need a 1" meter and 1" pipe with 3 pumps to have any pressure. I'm not wanting to deal with pumps at all. My local water co. said a 3/4" meter with 1" pipe and no pumps will be plenty. My options for meters are 3/4" $1800, 1" $3100 and 2" $5000. I'm planning on doing myself with HDPE. Also can I run two HDPE lines touching in the same trench or with they wear on each other?

 

[gerard143]

Water Co is on crack. Huge distance and rise. Boy they are pricey on meters too. 1.5” just to offset friction loss alone.

 

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[GReynolds929]

250' elevation will use up 109 psi, 1.5" HDPE at 1500' is 7 psi friction loss at 10 gpm, leaving you with 64 psi at the house which is usually adequate. I would use a 1" meter with 1.5" pipe. If you use more than 10 gpm pressure will be lower due to friction loss in pipe. I would not have pipes touching in the trench as they will rub on each other with expansion and contraction. Two trenches or one big trench with enough separation between pipes.

 

[Reach4]

For just a house, I would go with the 3/4 inch meter. Maybe a bigger meter could be worthwhile if you are trying allow for a big fire fighting gpm. Is the price difference only a one-time thing, or is there an additional monthly charge for the bigger meter? The price method varies. https://www.waltoncountyga.gov/263/Rates is one example.

HDPE pipe can be CTS, which is smaller than nominal size, and can be SIDR, which is bigger than nominal size.

For 20 gpm, which would give more firefighting gpm, you could upgrade to 2 inch

Since you cannot be sure the 180 psi will be reliable, maybe leave space/provision for a booster pump. If you actually get 180 that space can stay unused.