<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by GCRoberts</i>
<br />I'm trying to be as scientific as possible on my design. I've spent time over at irrigationtutorials. com. Obviously the guy that runs that site seems to have a plethora of knowledge. Hey....I think that's the first time I've ever used plethora in a sentence!!! Anyways, for my 3/4" copper supply line going to a 5/8" water meter, irrigationtutorial.com claims my MAXIMUM flowrate will be 10 GPM. Note: our static water pressure level is 70psi. This info comes from the town AND my direct measurement. BUT the town water department also gives me the following information. They didn't have 70psi on their chart, but they gave me the numbers for 60 and 80 psi going through 3/4" copper AND 1" copper ( an upgrade that would cost me $1000). Here's what their charts show: 60psi, 100ft, 3/4" copper = 20gpm: 80psi, 100ft, 3/4" copper = 24gpm: 60psi, 100ft, 1" copper = 38gpm: 80psi, 100ft, 1" copper = 44gpm. He said for my house (splitting the difference between 60 and 80psi) it would be about 22gpm. Why the big discrepency? I realize irrigationtutorials.com is probably considering other issues....but they say 10gpm is the MAX flowrate under ideal conditions. I would think that 22gpm would be the MAX flowrate....but my actual flow would be lower....maybe as low as 10gpm. But is 10gpm REALLY the number that I have to start with....and go down from there? What am I missing??? Thanks.
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