Everybody has their own idea about what makes a good stall floor. From a horse's perspective on achieving maximum comfort in a stall, I believe the flooring needs to provide a surface that's clean, dry and soft. There are a whole buncha real good ways of achieving this; additonally we were looking for solutions that were more labour efficient and economical than forking out ten inches of shavings from every wet spot in every stall each day, which is more or less what we do now. Rather than detail everything in writing, I've included a schematic that (I think) is pretty easy to follow.
If anybody has any questions, please feel free to shout 'em out. Obviously, my schematic is not done to scale. The top of the tile drain is roughly 15 inches below the bedding surface in the middle of the stall. The bedding is 6 inches deep all across the stall with the 3/4 stone making up the difference. If I had to guess, I'd say there is roughly 2 inches of 3/4 stone at the walls and (obviously) roughly 9 inches in the middle of the stall.
So far, these stalls have only been used intermittently but I can say with certainty that they drain like nobody's business ! :)
Hope this helps !