We plan to do this for one of the barns/sheds we have. During the wet we've had was my trial run. I left it to accumulate for 3 weeks and it was a nice base for them. Yesterday it just flooded with 2 inches of water in parts of it but they stayed dry on their hill of hay. I just cleaned it out today to get some of the water out of there and it's quite the awful job so I imagine spring will be fun. But winter won't have so much flooding (please no) so I think it could totally work.