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Old 09-26-2012, 10:29 AM
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1idejim 1idejim is offline
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Join Date: Jul 2009
Location: State of Jefferson
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Originally Posted by muddywater View Post
If it is a new neighborhood, i usually try not to max out gpms. Also keep in mind you lose/gain a 1/2lb of pressure per foot of rise/decline.

And on a long pipe run to the backyard you are going to have some pressure loss if it is 1" pipe. So if you are running 7 heads with great pressure right at the meter, then try to do the same 200' behind the meter and up an incline you could have a problem. I always try to be conservative... keeps me out of trouble and leaves the option to add a head in the future.
If you are being conservative use 0.433 per ft. instead of .5

6.70 psi per hundred ft. difference
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