I hate to do it, but I have sent many to lala land. They will dig and destroy anything. My front and back porch, my garage, my privacy fence, my gardens, and much more.
The problem is that the whole area backs up to wetlands (we're zoned as Agricultural). 
. Grew up in the country, up north, and we called them woodchucks. The holes are dangerous for cows and horses, so we always had the .22 rifle ready.
I've had electric wire on top of that fence for around 15 years now. I've tried putting it up along the bottom, but the grass and weeds quickly grow up to it and short it out. We also have two kinds of fencing (Utility and Chicken Wire). Along the back (which drops off about 2 feet directly behind the fence), the fence is tied down to 2" water pipe. On the sides and front, I have metal stakes into the ground every 2". Did I mention that we've always had a critter problem around here?
For removal, I average 3 groundhogs, a couple of dozen squirrels and around 150 chipmunks a year. My neighbors have similar stories. Still, I wouldn't DREAM of trading where I live for city living. Knock on wood, there are NO people problems around here!
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) one or two of them. One year I had to off three of them. So far, and the year is young, I have seven confirmed (confirmed means that I've removed their carcasses by hand), one probable (it fell back into it's hole and you don't go reaching into a groundhog's hole unless you really REALLY don't like your fingers), and one that I shot at from about 16 feet away (I can't imagine I missed him) but he made it to a thick planted area so I'll have to wait for the smell to confirm and remove him. I hope this is it. Hopefully all the neighbors have been removing their share, eh? 
