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well water pressure loss over distance

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well water pressure loss over distance bodega 10-27-2006
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Posted by James on October 28, 2006, 10:26 am
On my spring which produces 1gpm, I have a two inch plastic pipe that
goes 1200 feet to our cabin, and has a total rise of 300 feet.


I have a 1 hp pump, that pumps water pefectly fine to the cabin, and I set
my pressure tank at 50 psi, and it works just great !

The spring site has a 300 gal storage reservoir, so our 4 member family
never runs out, even at this very very low water rate of 1 gpm.

If you have as much as 3 or 4 gpm, you can simply quit worrying about
running a pipe 600 feet. You can do all the calculations you want, but
what you really want to know is will you have plenty of water and good
pressure, and I can tell you that you will !!


--James--



Tankless Water Heaters 468x60
Posted by Mike on October 28, 2006, 12:43 pm

> On my spring which produces 1gpm, I have a two inch plastic pipe that
> goes 1200 feet to our cabin, and has a total rise of 300 feet.
>
>
> I have a 1 hp pump, that pumps water pefectly fine to the cabin, and I
> set
> my pressure tank at 50 psi, and it works just great !
>
> The spring site has a 300 gal storage reservoir, so our 4 member family
> never runs out, even at this very very low water rate of 1 gpm.
>
> If you have as much as 3 or 4 gpm, you can simply quit worrying about
> running a pipe 600 feet. You can do all the calculations you want, but
> what you really want to know is will you have plenty of water and good
> pressure, and I can tell you that you will !!
3-4gpm??? A water saving shower head uses 3 gpm.



Posted by Bobk207 on October 28, 2006, 1:11 pm

Mike wrote:
> > On my spring which produces 1gpm, I have a two inch plastic pipe that
> > goes 1200 feet to our cabin, and has a total rise of 300 feet.
> >
> >
> > I have a 1 hp pump, that pumps water pefectly fine to the cabin, and I
> > set
> > my pressure tank at 50 psi, and it works just great !
> >
> > The spring site has a 300 gal storage reservoir, so our 4 member family
> > never runs out, even at this very very low water rate of 1 gpm.
> >
> > If you have as much as 3 or 4 gpm, you can simply quit worrying about
> > running a pipe 600 feet. You can do all the calculations you want, but
> > what you really want to know is will you have plenty of water and good
> > pressure, and I can tell you that you will !!
> 3-4gpm??? A water saving shower head uses 3 gpm.


Mike-

Maybe he's talking about the well / spring flow capacity not usage
demand / supply at the house.

He's using the 300 gal storage reservoir at the spring site as a means
of supplying the drawn down demand of the cabin use?

A 1 hp pump would run dry in a heart beat if only supplied w/ 1
gpm.......

he needs ~140psi just to over come the rise.


Fed law water saving showerheads are 2.5gpm, faucets about the same

so the 3 to 4 gpm house supply would be rather lean

IMO a house / cabin with more than one person needs more like 10 gpm to
give decent performance.

cheers
Bob


Posted by Bob Morrison on October 30, 2006, 10:28 am
In a previous post Bobk207 wrote...
> IMO a house / cabin with more than one person needs more like 10 gpm to
> give decent performance.
>

Bob's estimate sounds about right for the required flow rate available in
the house -- think showers and laundry + toilet flushing all at once.
That's why there should be a pressure/reserve tank at the house. As long
as the tank is big enough you can have a very low volume flow to the tank
from the well or spring.

BTW, this is the classic calculus problem of filling a tank at one rate
and drawing it down at a higher rate. How long before the tank is empty?

--
Bob Morrison, PE, SE
R L Morrison Engineering Co
Structural & Civil Engineering
Poulsbo WA
bob at rlmorrisonengr dot com

Posted by bodega on October 28, 2006, 8:26 pm
Thanks for the info. I suppose a guy could always increase the pump
size if more pressure was need too.
Bobk207 wrote:
> bodega wrote:
> > Can anyone tell me of a simple way to determine pressure loss over
> > distance in Gallons-per Minute of well water? Example: Assuming I have
> > 10 GPM at the well head, if I run a 2" ID water line 100', what loss in
> > GPM will I get? The tables I have been able to find all refer to loss
> > in water pressure (PSI). I need to go about 600' from the well head to
> > the new house and want to know if it is even practical to try to
> > utilize the old well.
>
> bodega -
>
> I hope you don't lose any gpm....cuz all the water going to the pipe
> at the well head better be coming out of the pipe at the
> house....otherwise you've invented a "matter destroyer"
>
> Your pump has certain preformance capability
>
> flow (gpm) at various pressure (head) levels
>
> ranging from.......
>
> lots of flow at very little pressure to very low flow at high
> pressure
>
> the length, material & condition of the pipe & elevation change will
> determinw how much head (pressure) drop will be suffered from well head
> to house
>
>
> here is a pressure loss calcaulator, you can play around with it
>
> http://www.freecalc.com/fricdia.htm
>
> 2" PVC (600ft) with 10gpm flow will lose less than 1 psi
> 1.5" pipe ~ 3psi
> 1" pipe ~ 30psi
>
> 1.5" pipe is probably signifcantly cheaper than 2" & you can probably
> handle ~2psi extra pressure loss
>
> so unless you're pumping a long way uphill in addition to the 600 ft
> AND you have a really wimpy pump you should be fine
>
> cheers
> Bob


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