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There are some fancy sprinklers that do smaller flower beds and corners. Draw out your yard, measure each 'box' and find sprinklers that fit the patterns of the yard. Try to have little over spray, the spray that hits the car, sidewalks, walls. Make sure that the spray from one sprinkler reaches the next sprinkler or you'll have dry spots.

Ok, now count your sprinkler heads in the 'plan'.  How many gallons per minute do you need?

Add up the heads and you'll have your gallons per minute.

Approximate gallons per head(I prefer the microsprinklers or the mp series sprinklers)

Rainbird 1800 or A17-F full circle 2.4 gallons/m quarter circle .6 gallon/minute 15 feet radius

Toro 570 full circle, 3.7 gallons/minute;  half circle, 1.8 gallons/minute;  quarter circle, 1 gallon/minute 15 feet radius

Rainbird MaxiBird 2.4 gallons/min (doesn't matter if it's a qurter of full circle) 36 foot radius

Mp-1000 full circle .8 gallons/minute; quarter circle .2 gallon/minute 14 feet radius

Mp-2000 full cycle 1.7 gallons/min; quarter circle .45 gallon/minute 20 feet radius

MP-3000 full cycle 4 gallons/min ;quarter circle 1 gallon/minute 30 feet radius

Microsprinklers are about .5 gallons/min 6-8 foot radius quarter circle .5 gallon/minute


Connecting your valves and sprinklers

Ok, say you have 6 mp-2000's in half circle, and 4 in quarter circle. So, 6X.9+4X.45= 7.2 gallons/min.

On the next chart you can see that one valve and ¾ pipe should be able to run 8-10 gallons per minute. If your 'plan' calls for 24 gallons a minute you'll need three valves. If you have a shady area and sunny areas try to break the valves up so the shade plants are on one valve. Likewise if some plants 9a lawn) need more water give them a different valve than your cactus garden.

Basic pipes

Pipe size(sch 40 pvc or polyeth)

My recommended maximum*

Possible with no problems

1/2

5 gal/min

5 gal/min

3/4

8 gal/min

10 gal/min

1

12 gal/min

16 gal/min

1 1/4

22 gal/min

28 gal/min

1 1/2

30 gallon/min

40 gallon/min

2

50 gallon/min

60 gallon/min

2 1/2

75 gallon/min

80 gallon/min


*If you use the lower number you generally do not need to count the fittings.

A ¾ inch antisiphon valve can deliver about 15 gallons/minute. If your pressure is low(you can stop the hose with your thumb) you may only be able to get 6-8 gallons/minute out of the valve.

You can use poly, sch 40 or class 200 for your pipes. I prefer sch 40 pvc. Use fresh glue, primer is not needed(may make the joints weaker). Bury your pipes at least a foot deep or you'll be repairing them later. Bury them at three foot and you'll hate yourself before you finish. If your stomach isn't flat before the job, with three foot ditches, it will be flat.

All that really matters in a sprinkler system is that you are covering the ground(or plant foliage) evenly and you do not try to get more out of the pipe than it can deliver. If there is a question of what the pipe you are plumbing into can deliver, turn off the water, put your ball valve on, turn water back on. Turn on ball valve with bucket under it, time it. That's not perfect, but it will give an idea of what is in the pipe.

If you can't figure out how to put the ball valve in, call a professional. Before or after.

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Edited on Jan 14, 2013. Authors:
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