Another sign of a dry lawn is grass that turns a dull gray-green. If only certain areas along sidewalks or driveways, for example are gray and the rest of the lawn is green, only water the dry areas. In good soil, less frequent, but heavier watering encourages a deeper root system and helps the lawn better tolerate hot weather. Clay soil absorbs approximately one half inch of water per hour. When the water starts to run off, turn off or move the sprinkler.
Sandy soil needs watering more often and for shorter periods of time.
Grassy areas on the sunny southern sides of buildings, on slopes, and areas near sidewalks and driveways need to be watered more often. Shady areas and northern exposures need to be watered less frequently. If you have an automatic sprinkler system, make sure it is not watering too long or too often. Automatic sprinklers should be used when the water demand is at its lowest - 4 a.m. to 6 a.m. With or without an automatic sprinkler system, it is wise to water during the evening or early morning hours.