It is Important when installing an irrigation system that the property have 100 percent coverage. Try to avoid making too many 90 degree turns because this reduces water pressure. You also want to create several zones if you are irrigating a large property because long extensions of pipes will further reduce water pressure. Sprinkler size and heads selected depends on trees and shrubs, while taking into consideration non-living objects such as driveway and sidewalks. It is best to used pop-up sprinkler heads for lawn because these are installed below ground level and not damaged by movers.