The goal of a well-designed system is to simulate a light rainfall. In order to do that there needs to be even irrigation. This is where head-head coverage comes into play.
Warning: Beware of Johnny Low Bid. He'll place two or three sprinkler heads in your front yard and "sling" water everywhere. Oh yes, everything will get wet, but not evenly. This is the key to a good design.
good design, you will have dry spots.
Some areas will be too wet, and others too dry. Our systems come with
a three-year warranty and a guarantee of absolutely no dry spots.