Seven rotors on a single zone looks like it will exceed your gpm even if you use the smallest nozzle 7x1.86=13.02 gpm. I think you should split that into at least 2 more zones to allow for other use in the house, just my opinion but designing at over 100% not a good idea.

 

Thank you. Good point about allowing room for other use in house! Any guidance on pipe size for mainline?

 

Is this drawing to scale? Wondering what the distance between s10 & s11 is. Looks about 20' if scaled. Also, you don't need to segregate the zones to the point where you're creating redundant sprinklers to do the same job. These sprinklers can be combined: s4+s13 & s5+s8.

BTW, Once you determine your pressure & flow limitations the next job when designing is to create good coverage with whatever sprinklers you have in mind. Leave the zoning/grouping of sprinklers for last! Get your spacing as if this was all on one zone (assuming it's all lawn area). Determine the GPM of each sprinkler and add them up to equal to more than 80% of your measured flow (80% of 12gpm= 9.6gpm) per zone. Ideally you have the zones somewhat evened in this regard, but not necessary.

As for pipe size.. 1" main is plenty for your size run (bigger pipe allows for more flow, ie gpm). Laterals at 3/4" is pretty standard.

 

@corneliani thank you very much for your comments. Yes the distance between s10 and s11 is about 20ft. Based on what you said I have decided to redesign. I have a quick question: for a lawn this size should I go with rotors or rotators? What spacing would you recommend for these sprinkler types? From what I have read, spec sheets overestimate radius. It looks like for rotors 30ft is achievable in practice but for rotators (e.g mp 3000 and rvan 24) to be conservative I should stick to 20ft distance between sprinklers. Does this (i.e. 30ft for rotors and 20 ft for rotators) sound about right? I am not going to mix rotors and rotators in a single zone. This is just to plan sprinkler placement options.

 

Funny you mention rotators, I was thinking the same thing mainly because you have irregular shapes. It will be a bit more work to install (meaning more heads) but you’ll get a more efficient & uniform distribution IMO. If your flow readings are right you just may be able to do it all on one zone (using MP1000s spaced at 15’ @ approx 50psi system pressure). That would be something, no? 😬🤷‍♂️

 

Yes, that would be something!
how reliable are the radius information on the spec sheet? If the spec sheet says 15’ radius should I actually plan and place the sprinklers at 15’ distance or some lower number (e.g. 12’)?

 

Those specs are typically best-case scenarios under ideal conditions, so ideally you stay at around 90% of that max. Don't make this a hard rule, just a guide. If you need 15' to evenly space out that 60' section, for ex, I would space them evenly and have other compensating factors make up for that gap as much as possible. This is where the art of design comes in. If that area is shaded, or at the bottom of a hill, for ex, you'll have more flexibility than if you're in full sun in the deep sun, watering a green on sand base. I personally think MP Rotators @ 15' spacing would be your best & most efficient design. You may step up to mp2000s and overshoot each head a bit (you can adjust a bit of that throw from the head too). I'm eyeballing 19-20 heads if you line the perimeter and fill in with 2 to 4 full 360 heads. This would require 2 zones, now that I'm looking at it closer.

 

Thanks for your inputs!