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Message: [QUOTE="Sheetmetalman, post: 120628, member: 3550"] No they arnt cemented in, and as I recall I had some form of support every 2 foot--mostly treated 2x4s but also some steel pipe--pipe was driven in to help hold the 2x6 from buckleing outward but looking back I dont think I needed it because I put a 2x6 cap board on top as a place to sit or place rock and that cap board wont allow the water weight to push out the 2x6 edge board--Look in water garden photography under Pond in Southern Illinois to see what I mean by a cap board. Also the waterfall side has all the dirt piled up in a sort of mini-mountain all the way across that side--the liner just climbs that hill and my waterfall support which is in the middle of this hill then the granite slabs were placed on top of this liner and the large rock was stacked on both sides of the waterfall on that liner and right up the hill--all 3 other sides were the wooden collar method I described in other post, Tim [/QUOTE]