My neighbor, Sandra, did the same thing with a crawl space for her plants, it's great and I have serious envy.
I keep thinking this underground spring has surely dried up in our recent droughts, but I'm not sure.
So glad you have it, Vic. I should have known.
Now if I can borrow Hank for awhile . . .
Of course you could come too and with the 3 of us working, well, it shouldn't take long.
Better wait for spring now, though, the critters are probably already there bedded down for winter.