Head To Head Coverage in Irrigation Design (sprinkler system design)

Spacing your sprinkler heads in a head to head coverage pattern is common practice in irrigation system design. Learn why in this video. This video is part of our online video training course, Irrigation 101: All About Sprinkler Heads.
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Para subtítulos en español, asegúrese de que los subtítulos CC estén activados, luego haga clic en Configuración (la rueda dentada) y luego haga clic en Subtítulos y luego en Español.

[@MJ-yo8rn]

Thanks so much for this video! I 've learned a lot in two minutes, you are a great teacher! Thanks!

[@Proirrigationtraining]

Thank you so much for saying that! And thanks for watching!

[@mvlouman]

Love your videos. My backyard is exactly that shape and will need tbe same number of heads. I'll split them in two zones. What's the most efficient way to run the lines? Should i do it in series in a closed loop or should I run the main line in the middle and then tee off from it for each head?

[@Proirrigationtraining]

It's better to have a main line down the middle and branch off to each head instead of in series. Thanks for watching!

[@nicko5566]

If you want to reduce friction loss over a one hundred foot run, could I go from the 1” pipe already installed into 1 1/2” pipe for the hundred foot run as a way to prevent the friction loss that would occur with 1” pipe?

[@Proirrigationtraining]

Yes. It would reduce the friction loss in that line. Thanks for watching!

[@Anthonyvelez13]

I have a perfect square backyard that has 16 sprinklers. How do I know if I need a 90 180 or 360 sprinkler??? I just had them installed n the people did a terrible job. Also do you recommend the mp rotators with the pro series pressure regulated heads at 40 psi? Also it’s the same setup as this but there’s 4 rows with 4 sprinklers down each row. so going off this I would need 4 90’s 8 180’s and 4 360’s is that correct? Mines perfectly square just this example

[@Proirrigationtraining]

Yes you're correct. It sounds like you would need 4 x 90's - one in each corner. All along the sides you would use 180 degree patterns, and in the interior of the space you would use 360 degree patterns. I definitely like the MP rotators on Pro Series 40PSI spray bodies, but rotors such as the Hunter PGP Ultra and the Rain Bird 5000+ Series would work as well.

[@eddiemarano9998]

In my quest to get head-to-head coverage in my previously installed sprinkler system, I notice that there is a valve box in a corner of the yard where a 90* rotor would be perfect. Is it okay to place a rotor near that valve box? The valve box is for 2 different zones. Thanks

[@Proirrigationtraining]

It shouldn't be a problem. Just be careful digging around the box since you know there's wires going into the box. Good luck and thanks for watching!

[@Los714]

Right now I have the rainbird 1800 sprinklers. Do you recommend rainbird or hunter nozzles? I been using the hunter radius adjustable heads but I don’t like the spray pattern, it’s not even. I seen my local box store has rainbird U series nozzles been thinking of trying those.

[@Proirrigationtraining]

To be honest, I like them both. Make sure that you use the screens on every nozzle, it helps with debris in the water clogging up the nozzles. The U Series is a Matched Precipitation Rate nozzle family and does a fine job.

[@destinyhart7532]

Can I email a picture of my front lawn layout for sprinkler placement advice?

[@Proirrigationtraining]

sure. allgreenmedia at gmail dot com. Be sure to include measurements of the area.

[@ashleshalad6077]

Hello Sir, What sprinkler will you recommend for 3’ small portion.

[@Proirrigationtraining]

A spray body with a Rain Bird 4" VAN nozzle, and you can use the screw in the middle top to dial down the flow and radius. Or, you can use a couple micro-sprays to cover that area. Thanks for watching!

[@maimahmoud7370]

Can I install 7 and 9 meter rotors in the same zone for irregular lawn space?

[@Proirrigationtraining]

Yes, as long as the Precipitation Rate is the same for both rotors. Otherwise, you'll get uneven results.

[@maimahmoud7370]

Thank you very much 🙏🏻

[@Los714]

So as long as they do the reach around everyone’s happy?

[@Proirrigationtraining]

Lol, pretty much.

[@NotSoLiberal]

So how do you fix the obviously underwater spots that don't get enough coverage (the light shaded areas). Seems complicated, especially with sprinklers not very precise

[@Proirrigationtraining]

As long as you stick to a square pattern, head to head, there will be 3 sprinklers that are hitting almost all areas. That's pretty good. Generally the best uniformity that you can expect is 85%-ish with rotor or spray zones, so do the best you can to lay out and install the system precisely and know it won't be absolutely perfect. If you're designing oddly shaped areas, start with a square grid, then add "kicker heads" to compensate for the weak areas. It's ok to slightly overdesign a zone, you can always nozzle down your kicker heads if its too much water.

[@NotSoLiberal]

@@Proirrigationtraining Thanks for you answer. I have the sprinklers (mp rotators) only on the perimeter of a rectangular area. A couple sprinklers are closer to the right/left edge than they are to the opposite edge. So either head to head to the right/left sprinkler which means there will be areas in the middle not getting enough or do head-to-head to the opposite edge which means I’m going way beyond the right/left edge of the lawn as the stream rotates to the sides!

[@Proirrigationtraining]

@@NotSoLiberal Always start with your exterior edges and work in, especially if the edge is a sidewalk or street. If there is a deficiency or weakness in the middle, put a head there. It's easy to adjust nozzle sizes or cut the flow down as needed in the middle. And It's easy to put extra heads in during the installation versus adding it later.

[@darrentribble1891]

Does head to head coverage double your precipitation rate?

[@carloscruz-qb4xk]

You have to choose the correct nozzles to make them even. Trying to Giving the same amount of water.

[@sayidehsanmubashir9765]

Nice

[@Proirrigationtraining]

Thank you for watching!

[@KaliBlaz]

except that realistically most people don't have enough pressure or water flow to put 20 sprinklers on a single line to have any of the above.

[@Proirrigationtraining]

Oh for sure. This is just for illustration of the concept. I probably should have said that. Even with larger commercial or sports field systems that do have the capacity, it wouldn't be like this. They would use larger and fewer rotors.

[@massivekilla121]

The point of this comment? The information given illustrated head to head coverage. Not 20 heads on one valve