Here in south Louisiana flooding and standing water is a real threat to tortoises in outdoor enclosures. We had some yard renovations done earlier this year and included a French drain in my Hermann's tortoise outdoor enclosure. it's working GREAT!!!! As you can see from the photo below, there is standing water OUTSIDE the cinderblocks of her enclosure, but NO standing water INSIDE!!!!! It cost a pretty penny but is well worth the peace of mind to know my tort will be safe. (She's in her indoor enclosure for the winter)