Thoughts on grade of concrete and drain in Cooler & Washrack concrete

What are your opinion on the appropriate grade of the concrete in the cooler and the type of drain system used in a Cooler and Washrack? I am looking to build a new showbarn and wanted to figure out the best system and grade of concrete to use in cooler that has worked for others. Thanks. 

go at least a 1/4 inch per foot on the pitch of the floor to the drain. i would suggest using a trench drain at least a third as long as your cooler. removeable pipes are also a great thing to have to keep the cattle from swinging where you wash and clip.

How do you keep the bedding out of the through drain?

One suggestion that I would emphasis is to NOT put in a drain tile system.  I had one for a year, it worked great and then would take zero water.  They get way too gummed up.  I now have a 4 inch sewer pipe that drains to a side hill.  Even in the winter I can dump a 5 gallon pail of hot water down to thaw things out and it works awesome.  It is also a ton cheaper than digging a drain.  It is a ton easier to clean as you just go to the end and scoop up hair, manure, dirt, etc.  I wouldn't do it any other way!  For a system in the cooler and washrack I have a 12 inch wide gutter that is 6 inches deep on the drain end and zero on the top end.  It is 20 feet long and drains very well.  Not sure what that makes the pitch.

this  is what i have for washing and clipping in the cooler