Thanks LMH. I don't have a drainage problem in the corral area. It's is one of the best places on the property for drainage - and there are some pretty good places. I think I'll use the information about the M-10 for another place, though. On the horse entrance to my barn, there is a place where it can get mudd-though I use a different entrance if it's wet. I'll look into the M-10 for that. I really don't know enough about these gravels.