Green lawns only need one inch (2.5 cm) of water per week including rainfall, even in the driest conditions. Deep, infrequent watering encourages strong root systems. Using too much water causes nutrient runoff, promotes shallow rooting and contributes to the buildup of thatch. After a day of heavy rain, consider skipping watering until the following week or install a rain shut-off device onto your irrigation system that will automatically turn your system off when it is raining.
To reduce evaporation and scorching of leaves from the sun, water in the early morning from 4 - 10am or the evening from 7 - 10pm according to the Stage 1 Watering Schedule. Make sure your sprinkler or irrigation system is watering the lawn and not hard surfaces such as driveways and sidewalks. Fix leaks and broken or clogged sprinkler heads. Check out this video for more efficient irrigation tips.