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If you increase to 3/4" You will most likley enlarge your gpm flow by about 1 or 2, which isnt much really. Is there anything you can do about the 5/8???????? if you can remove and replace with a bigger pipe then that will increase your flow by alot.......if you cant or dont want to tackle that, then go 3/4" and use a smaller nozzle............or put less heads on a line.....what heads are you using.......?????

Thanks
Ray
Rays Above and Beyond Automatic Lawn Sprinklers

Yeah, most towns dont like that stuff, but where i live thats code, that you have to change the meter when installing an irrigation system although most contractors dont do so! 9.2 GPM is fine for a sprinkler system and will produce great results!!!

Hope your system comes out good!

Thanks
Ray
Rays Above and Beyond Automatic Lawn Sprinklers

<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">If you increase to 3/4" You will most likley enlarge your gpm flow by about 1 or 2, which isnt much really.<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

I've got to back this statement up, and for those like me with a 5/8" meter and a 3/4" supply, you most likely will not get even that much of a difference.

I'll admit that I'm only starting to learn this stuff my self, but here's the best way I can think to explain it: Water is a non-compressable fluid, so when you force it through a restriction, the flow is not blocked, it just increases it's speed while it travels through the restriction. However, this restriction will produce a loss of pressure, and the loss of presure is where a loss of potential gpm comes from.
What will make a much bigger difference is the size of the pipe from the meter to the location it is needed because this produces a presure loss as well.
Some numbers that I can find real quick indicate the following:

At 10gpm, a 5/8" meter will lose around 3psi.
At 10gpm, a 3/4" meter will lose around 2psi.

Compare that to presure losses of water running through a 100' of copper pipe:

At 10gpm, a 3/4"x100' copper pipe will lose around 11psi
At 10gpm, a 1"x100' copper pipe will lose around 3psi

So for someone like me with a 5/8" meter and 3/4" mainline, I will get more of a pressure return (and most likely cost less) to replace 3/4" copper with 1" copper than to try to get the city to change my meter from 5/8" to 3/4"

I would tee in 1" copper as close to meter as I could.