I'm trying to create a water obstacle to walk horses through - maybe even deep enough for them to swim through.
I'm having trouble coming up with an idea for what to use to keep water in and have good footing (without mud) at the same time, but something that's a lot easier on the pocket-book than cement.
Any suggestions for what I should use for the walls and the floor? they can be different if necessary. I figure since sailing ships and canoes were created long before concrete, I should be able to make something that holds water. I could probably even spray on a water-proof liner that has traction for the footing.