From late spring well into fall, San Diego can go months without a meaningful rain, and in Tierrasanta the canyon slopes behind the houses fade to the tawny color of a lion's coat. Out there, chaparral survives on its own terms; in the yards above it, green grass survives because someone thought carefully about water. Rain Bird Sprinkler Design works on the layout itself: where each head sits, how far each spray reaches, how the zones divide a yard so every part gets what it needs and nothing runs off into the street. Good sprinkler design is invisible when it works, with no dry corners and no soggy patches, just a lawn uniformly green from the curb. In the evening, when the timers click over and the first arcs of water catch the last light above the canyon, it looks almost like rain arriving on schedule.