How to Install a Sprinkler System (with Pictures) – wikiHow

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Divide the areas into rectangles (if possible) of about 1200 square feet each. These will be your "zones", or areas which will be watered as a unit. Larger areas will require special heads and a higher volume of water than you can normally get from a residential water system.

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Chose the appropriate sprinkler heads to cover your zone, using pop-up impulse or gear driven heads for wide grassy areas, shrub heads or bubblers for shrubs and flowers, and fixed pop-up heads for locations adjoining buildings or paved areas like driveways and streets.

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Mark the location of each head in accordance with the spraying distance of the heads you choose. Rain Bird R-50's, a common good quality head, will spray an arc, semicircle, or full circle about 2530 feet (7.69.1m) in diameter, so heads can be placed about 45 feet (13.7m) apart to allow some overlap.

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Count the number of heads you use on a zone, and add the gallon per minute volume for each one. You should find the typical gear drive head can be rated from 1.5 gpm to 4 gpm, depending on the nozzle diameter. Fixed pop-ups generally run about 1 gpm. Add the total of gpm of the zone's heads, and use this number to size your pipe. As a rule of thumb, a zone with 5-7 heads should require about 12-15 gpm, with the water pressure supplied at a minimum of 20 psi (pounds per square inch). To supply this zone you will need a one inch main pipe (line), with 34 or 12 inch (1.9 or 1.3cm) branch lines from your main.

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How to Install a Sprinkler System (with Pictures) - wikiHow