At “8 Days” we use a vibratory plough machine to pull most of the sprinkler system poly pipes into the ground. This will still cause some scarring to the lawn/turf, but way less damage than hand-digging trenches. Some hand-digging will have to take place in areas where there are underground utilities, installing sprinkler heads, valve boxes, mainlines, pipe connections, and tight areas, etc.
With residential irrigation installations, irrigation pipes are installed generally 4-8 inches (10 to 20 cm) in depth. These pipes need to be deep enough so they can avoid damages such as aeration. Some areas where we may not be able to achieve preferred depths would be large tree rooted sections of a property.