waterfall
Home centers (Home Depot - Lowes- and such) sell molded plastic
climbing walls for children's play sets. They look like a gray rock
wall with flat spots molded in (ideal for plants) and are about the
height you are looking for. They have them buy the swing sets and
slides. I think once it weathered and algae built up it would look
good and it is all one piece(no leaks).
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