Need Advise Selecting 1" or 2" Domestic Water Connection

[306ARayT]

County is installing new water lines and I have the option of 1" or 2" connection. I'm concerned about pressure loss due to distance and elevation change. The water line will be sch 40 PVC approximately 300lf, with approximately 5' elevation rise, and two each 90degree fittings. Inlet pressure will be 60-65psig. My maximum flow rate will be no more than 10 GPM. I'm concerned 1" will not be sufficient . They want 4 times as much to go from 1" to 2", both being my only options. Any advise would be appreciated.
Thanks, Ray

 

[bimr]

You don't mention the size of the residence, but a 5/8-Inch water connection is typical for the average residence. If residential fire sprinklers are required, you will typically need a 1-Inch water service. A 1-Inch water service will have a 10 psi headloss over the 300 feet.

Your water service should be constructed of copper or PEX. Use of Sch 40 PVC is questionable.

 

[306ARayT]

Thanks bmir. The resident is 3 bath, 3200 sqft, 2 story. Have one bath with high flow (duel head) shower.
What's the issue with PVC?
Appreciate the advise.

 

[LittleInch]

According to this excellent website https://www.engineeringtoolbox.com/pvc-pipes-friction-loss-d_802.html

At 10 GPM your 1" sch 40 PVC pipe will lose 2.6*3 = 7.8 psi plus your 5' rise so another 2 psi so maybe 10 psi drop in total.

A 2" supply would reduce that total pressure drop to maybe 2.5 psi.

But starting at 60-65 will give you 50 psi or about 110 ft head at the connection point. Should be more than sufficient for a domestic dwelling.

I can't see the benefit of a 2" supply myself, but even a 1/1/4 " would help hugely.

Or double up your 1" supply line for presumably double the cost? But the trench cost should be the same so it should be even less. Two off 1" supplies is basically the same as a 1.4" supply.

If it all goes pear shaped you can always stick in a booster pump at your end.

 

[XR250]

They might decide to charge more for the 2" service in the future.
I know they do here.
1" @ 50 psi seems fine.

 

[bimr]

Where I reside, the water meter monthly base fee for just the meter not the water is $15 for a 1-Inch meter and $75 for a 2-Inch meter.

Piping with glued joints is rigid and subject to breaks as the ground moves. In the midwest, most of the water services are copper or PEX with brass fittings. Underground water mains are generally installed with flexible joints.