I use a type of stall mat that can be bought at Tractor Supply. They don't hold water, and they won't smell like piss if you clean them everyday. I've never had a grown, mature dog start to destroy or eat the ones I have, but I have had some pups gnaw it on from time to time. The matting is thick enough and rugged enough that they're not pulling chunks out of the matting even if they do decide to chew on it.

I don't know if I'd use a matting where water flows through unless there is some particular way that the water flows down on a small gradient.