most 11x16 ponds are only 2' deep and that supports fish. it would be excessive for a small residential pond to be deeper than that. http://www.aquascapeinc.com/myths this site will give you a lot of info!! I'm a certified aquascape contractor, and Aquascape it an industry leader. Great resource if you want to diy, or hire a certified contractor to install it.
Robert Bulger with ServiScape, LLC
Spallina Interiors
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