I used 1.25" stuff for a 700' run. The pressure drop does not appear to
be more than about 10psi at 5gpm. Since the pressure starts at 40-50 psi
I think I still have enough to work with. The 1.25" polyethylene tubing
was a bit more expensive than the 1" stuff, but was still affordable.
1.5" is probably available at HD also. Larger than that gets pricey and
you'll have to go somewhere else to find it.


Bob wrote:
...I used 1" for my whole sprinkler system. For a 250 foot run, I'd certainly
want something bigger. You'd get better pressure.

Bob

5 gpm isn't very much for a sprinkler system. If he's just running one
sprinkler at a time, 1" might do it.

Bob

"dps" wrote in message
...
I used 1.25" stuff for a 700' run. The pressure drop does not appear to
be more than about 10psi at 5gpm. Since the pressure starts at 40-50 psi
I think I still have enough to work with. The 1.25" polyethylene tubing
was a bit more expensive than the 1" stuff, but was still affordable.
1.5" is probably available at HD also. Larger than that gets pricey and
you'll have to go somewhere else to find it.


Bob wrote:
...I used 1" for my whole sprinkler system. For a 250 foot run, I'd
certainly
want something bigger. You'd get better pressure.

Bob

5 gpm is a lot for a home water system. The pipes in the house are
generally 1/2", although 3/4" pipe is sometimes found. Take a gallon jug
and see how much time it takes to fill it from your hose cock. I can get
around 5 gpm through mine (12 seconds/gallon). My kitchen sink will
produce around 2 gpm and the bathtub will do about 4.

Take a garden sprinkler and put it in a 5 gallon bucket. My guess is
that it would take significantly longer than a minute to fill the
bucket. This would be a useful exercise to do anyway, since you need to
know the rate if you want to control the amount of water your garden
gets. A 50 x 50 garden (2500 sq. ft.) needs about 1550 gallons (US) to
approximate 1" of rain. (1" over 2500 sqft = 208 cubic ft, about 7.5
gallons/cubic ft [Handbook of Chemistry and Physics, 37th ed.]). This is
one reason why drip irrigation is so popular with large growers. The
water can be applied to the crop, and not to the weeds between the crop.
You can possibly reduce your water useage by a factor of 10.

A 50 x 50 garden could be covered by one sprinkler moved around on a
regular basis. I've done it on a 75 x 100 garden, but it takes several days.




Bob wrote:
5 gpm isn't very much for a sprinkler system. If he's just running one
sprinkler at a time, 1" might do it.

Bob

"dps" wrote in message
...
5 gpm is a lot for a home water system.

My largest sprinkler "zones" run about 20 gpm.

Bob

Where I live, everyone is on private wells. No public water. It's
possible that a public water system could deliver more pressure/volume
than an individual well (after all, they have to be able to supply fire
hydrants).

Most people will still be limited by the size of the pipe within the
home leading to the hose cock. 1/2" pipe is most common in older homes
with 3/4 used for some of the main runs. I wouldn't know about newer homes.



Bob wrote:
"dps" wrote in message
...

5 gpm is a lot for a home water system.


My largest sprinkler "zones" run about 20 gpm.

Bob

On Tue, 08 Feb 2005 07:51:30 -0500, dps
wrote:

Where I live, everyone is on private wells. No public water. It's
possible that a public water system could deliver more pressure/volume
than an individual well (after all, they have to be able to supply fire
hydrants).

Most people will still be limited by the size of the pipe within the
home leading to the hose cock. 1/2" pipe is most common in older homes
with 3/4 used for some of the main runs. I wouldn't know about newer homes.


I am on a private well and get plenty of water but I designed the
system that way. I run a 1-inch line directly from my pump to the
garden. That is easily sufficient for my needs.

I have not gone through the numbers but I am pretty sure that I can
get more than 20 gpm in the garden 200 feet from the pump.

John


Bob wrote:
"dps" wrote in message
...

5 gpm is a lot for a home water system.


My largest sprinkler "zones" run about 20 gpm.

Bob