On average, in the summer, most lawns need 1 to 1.5 inches of water per week to stay lush and green. That water can come from rainfall or irrigation. How often your lawn needs a drink depends on a host of factors, including things like soil type, sunlight, grass type and regional climate. The list truly goes on and on. In many municipalities, water restrictions are the norm, and lawn watering is high on the list of wasteful water activities. Most lawn sprinklers that rotate back and forth require about 2 hours of run time to deliver 1” of water. Small fixed spray heads only require about 45 minutes of run time to do the same. Spread this time over 3 or 4 days and your lawn will get the right amount of water. Water less in the spring and fall, and turn the controller to off when there is prolonged rainfall event or it gets cool out to insure your saving water.