He writes: "I was convinced my backyard was level until a laid down my plastic and started to fill it up with water.  I was 2 boards high all the way
around and one end of the rink was full and the other end had no water!  I
ran out and got another 8 2x6x6' boards and added them to the one end. I
then continued filling and filling and filling ....  I am approx. 12" to 13" thick at one end , and maybe 2" to 3" on the other end."

Take note of the "net" behind the "net" ... it is a soccer net . Good idea.

Thanks for the picture Brian.