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Posted by RicodJour on September 3, 2006, 1:32 am
J.A. Michel wrote:
> I'm designing a sprinkler system for my yard. This will be a fairly complex
> system, as the area to be watered is fairly large. I'm going to DIY install
> the system. I have a good handle on most everything that needs to done,
> however, I need help determining my available flow in GPM.
>
> I checked pressure at an outside faucet, and have a static 62 PSI. I checked
> flow at the same location and have 8 GPM. I was doubtful of the 8 GPM
> reading, because that sillcock is supplied by a 1/2" pipe. So I opened up
> the shower and bathtub, and ticked off 14 GPM by using a timer and watching
> the gallons go by on my watermeter in the basement.
>
> So, which reading is correct? Is there a better, more accurate way to
> determine GPM? I really want to get this right. I have a 1" watermeter,
> which has a full 1" ID poly supply pipe. The supply pipe is 50 ft. long,
> from the street to my house.
>
> Second question:
> The spot where I plan to tap for the system is about 4ft after the
> watermeter. The pipe is 3/4" copper. To maximize flow, should I replace the
> 3/4" with 1"? Or will such a short length of pipe matter? I plan to use 1
> 1/4" PVC going to the zone valves as well. Is this OK?
http://www.irrigationtutorials.com/sprinkler00.htm Very complete
workup.
R
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