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New Member


Thursday, May 5th 2016, 8:14am

New install - poor coverage


Static pressure about 60PSI; water via city 1"; all irrigation pipes SCH 40 PVC 1"; 7 heads per zones; 2 zones. Rain Bird 5004s.

My first install - and having low coverage in 1 area, at highest peak. Most heads are 30' apart, but this section ended up 40'. I did not account for the land grade and placed my zone valves at the lowest point, coming from the highest, maybe 10' drop. Running, it drops from 60 to 25psi. I moved everything to 1.5gpm nozzles. Performance charts say 25psi on 1.5gpm = 33ft.

I'm considering moving the zone valve to the highest point and let the water run DOWN, instead of down and back up. Then I figured any pressure lost on the down and back up, would balance the difference when configured just from high to low grade with valve at the high end. I guess it would eliminate some pipe (friction) though (125'?). Another option would be to move 1 or 2 heads from the strong zone, to the weaker one.

Would moving the zone valve to the higher grade help much? Or, removing 1 or 2 heads better option?

Thanks for any input.


Supreme Member

Posts: 5,292

Location: Metro NYC


Thursday, May 5th 2016, 8:52am

Your best bet is to split the zones. If it doesn't work well with 1.5 gpm nozzles, you are painted into a corner. Run only two or three heads in a zone. The watering gets done just about as quickly, since you use larger nozzles, and the coverage and reliability also improve.


New Member


Saturday, May 21st 2016, 6:58am

Wet_Boots: Just wanted to say thank you. I didn't think of it before, and your suggestion was perfect. This is exactly what I did and it is working great!

Thank you.

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