I guess I am missing something, I placed around 40 concrete donuts around the sprinklers around 10 years ago. Three were cracked by either the lawn mower or the landscaping trucks, I have never cleaned out the center and the sprinklers work just fine. I have had 2 sprinkler heads damaged when the concrete donuts were damaged. I replaced the damaged heads (ACE hardware was very helpful) and then the concrete donut.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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