Answers to Run Times
Here is some information that I have preacticed and it works well.
How do you know if you are putting the correct amount of water down with your automatic or manual sprinkler system? The most effective method is to place a rain gauge in the yard and measure how much water goes down in a certain time. During the heat of the summer, typically you will find that 1 hour in each area 3 days a week will provide the necessary moisture. During spring and fall, 15-30 minutes of water in each area, 3 times a week, may be all you need. Keep in mind that wide open areas exposed to all day sun will need more water than shaded areas and adjust water amounts accordingly. If the grass does not spring back up after walking on it or begins to show a gray appearance it's time to water.
Is it possible to over water? Absolutely! Not only is over watering wasteful it too can have detrimental effects on grass such as creating the ideal environment for the development of fungus and other turf grass diseases. A general rule of thumb is 1 to 1.5 inches per week in two to three waterings.
Water 1-1.5 inches per week.
Avoid watering every day or even every other day.
Water deep to increase root development.
Allow the soil to dry out between waterings.