Sprinklers attached to a 3/4" hose usually apply only small volumes of water to a turfgrass, and need to be left in one location for 2 to 3 hours in order to thoroughly wet the grass rootzone. Automatic irrigation systems usually apply much larger volumes in a given time, so be careful not to overwater!
To determine the amount of water being applied by a sprinkler, place shallow straight-sided cans in a grid pattern around the sprinkler. Turn it on, then after a given time period, measure the depth of water in the cans.
Use this measurement as a guide as to determine how long a sprinkler should remain in a given area. Remember that it is always better to remain on the dryer side of proper irrigation, rather than risk the adverse affects from overwetting the turfgrass.
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