Better Way to Set times
One reponse was correct, it depends on the head types. It also depends on what soil is under the sod; each lot is a bit different. I went to clemson Univ's ag site and read zoysia grass here needs 1 and 1/2 inches of water a week. Take the time to set out a plastic container and run your sprinklers to see how much depth you get in the time you run. Then buy a $4 rain gauge and check what Mother nature gives us, and add more if needed. Since I did this I have cut my irrigation water tremendously. It's definitely worth the time.
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