How to design irrigation for a rectangular garden
A practical guide to designing an efficient irrigation system for a rectangular garden, from measurements to sprinkler layout and material list.
Why rectangular gardens are trickier than they look
Rectangular lawns look simple, but corners are the weakest points and are often left dry when spacing is guessed. Uniform irrigation needs a deliberate layout, not just a few sprinklers on the perimeter.
Apply the head-to-head rule
Each sprinkler should reach the next sprinkler head. With a 4 m radius, spacing should stay around 4 m. On a 10x8 m lawn this commonly means corner heads plus mid-side heads.
Choose arcs and radius correctly
Use 90° nozzles on corners, 180° on edges, and full-circle where needed in inner areas. Radius selection must follow real pressure, not only catalog values.
Zone sizing and flow limits
Keep each zone below about 80% of available flow so pressure remains stable. Oversized zones reduce throw distance for every sprinkler.
Typical material list
For an 80 sqm rectangle, a common setup includes about 6 pop-up sprinklers, PE pipe, fittings, one solenoid valve and a controller. Exact quantities should be generated from the actual map.