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To determine how long to run your sprinklers, place several empty, straight-sided cans or cups at different distances within one zone. (Uniform coffee mugs work well.) Run the sprinklers for 15 minutes and measure the amount of water collected in each can. Calculate an average water depth and determine how long it will take to apply a Â½ to Â¾ inch of water. Example: Â· Â¼â average depth of water after 15 minutes â water 35-50 minutes in that zone. Â· Â½â average depth of water after 15 minutes â water 20-30 minutes in that zone.
Therefore, water before the heat of the day so that the lawn has time to dry before nightfall. You can put the sprinkler on anytime from 4am to early afternoon on most days even sunny ones. If the temperature gets above 240C/750F turn the water off. If you have disease in the lawn watering can make it worse.