Hole drilled in back of skimmer

:wave: Welcome to TFP!!!

Looks like a poor mans overflow drain.
Any overflow should be plumbed to pipe that allows it to drain to a location that will not cause problems. Just draining into the soil right by the skimmer seems like a bad idea to me.
Personally my pool's have not had overflows ... so you could just plug up the hole. Although FL gets a bit more rain than AZ ;)
 
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