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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.
But you can turn the system on slower if you do it manually at the individual sprinkler valves. 1  Take your time and go through each of the sprinkler stations because if a line is broken in the ground it may take some time to bubble up. 2  Dig up and repair any leaks and replace sprinkler heads that are broken.he following steps will guide you through the process to start a sprinkler system after winterizing. 1  To turn a sprinkler system on located the sprinkler shut off valves. 2  In my area there are stop and waste valves in the ground and then pressure vacuum breakers above ground.