View Full Version : Professional opinion needed
06-13-2004, 03:08 PM
I have a couple of areas that I need some help in. I am new to the irrigation field this will be my first install.(my own house).I have an area that is 8' wide and 150' long can any one tell me how many heads I will need in this area and how much should I space them apart.I am running Rain Bird pop ups 1800's.My second area is 8' wide and 45 ' long. I will be using county water if that helps.I plan on making these two areas one seperate zone. any information will be helpful. Thanks.:o
06-20-2004, 12:06 AM
GPM? Static pressure? line size? meter? backflow, and size? lateral line size?
more than just throughing them in the ground......
06-20-2004, 01:14 AM
Figure out how many Galllons Per Min you can get from the main. How far do those heads spray at your gpm all on one zone?
Be sure to run 3/4" inch from the valve most of the way through that zone, and then maybe at the end you can run half inch.
Use 1 1/4" line as your main, and then the 3/4" and 1/2" as your lateral.
06-20-2004, 12:58 PM
In the 45’ – calculate it to 48’ - long strip, you will need 14 heads placed in a square pattern. Each corner of the rectangle will have an 8’ 90-degree head and nozzle, and then you will need 10 more 180-degree heads/nozzles (five on each side). You space these heads (head-to-head spacing) 8’ apart.
Four 8’ 90-degree nozzles @ 30 psi will draw 1.04 gpm, and10 180-degree nozzles @ 30 psi will draw 15.8 gpm. The total demand for that area would then be close to 17 gallons per minute… too much flow for ¾ “ class 200 pvc pipe.
The 150’ strip – calculate on 152’ - would also take the four 90-degree heads in each corner, plus 36 in between (18 180-degree nozzles per side). Total gpm for that area: 58. Better make that three or four zones, depending upon how much water (gpm) you have available. Don’t use it all up – leave a bit for flushing toilets, etc.
Most of these fixed spray nozzles will work fine with lower pressure, but don’t figure that you can draw 58 gallons per minute from an 18 gpm source. It ain't gonna work.
06-20-2004, 06:22 PM
Thanks to all that reply all your info is great help.
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