Don't water the pavement. Position sprinklers so that water is aimed directly at lawn and garden areas rather than sidewalks, paths, driveways or fences. Along paved areas it might be more efficient to water by hand. Use mulch strips to contain watering areas. Consider laying down an eight-inch buffer of mulch adjacent to sidewalks and curbs to reduce runoff and water waste.
Large drops mean less waste.
Use sprinklers that emit large droplets rather than a fine mist to reduce losses through evaporation. Deep soak each time you water. Many people water lightly and frequently, causing a shallow root system. Watering deeply and infrequently creates a healthy root system that is better equipped to withstand heat and drought. Water without waste.