There are no drains in the floor. I thought about it after I poured the slab(a little late I think). However, I water, and will continue to do so, with 3 gallon buckets. I thought of hooking a water line strsight to the racks, but decided that I didn't like the potential for a flood to keep flooding because of a continuous flow of water. With the 3 gallon buckets, after a tub is full, there is very little water left to run on the floor, if any. As far as flooring goes, I will use the same thing that I put in my other rodent room and snake room, solid roll vinyl flooring. I like it because it is cheap, easy to install, and therefore easily replacable every few years if necessary. Let me know if you all have any more questions. And Chris, I'll be using the same design for my rat racks that I have been using. (By the way, the DIY Rat Rack page should be coming to my website shortly after the room is finished, as I'll be building about 5 more) Also, we are probably going to be adding one of the ARS Rodent racks in March. I'll post pics of it when we get it, and let you know what we think of it.