I am looking for some (free) advice in my DIY koi pond project. I am building a formal pond approximately 16' X 22' with a max. depth of 5'. The excavation will be 3' deep so 3' will be backfilled and 2' will be above grade all around. I am interested in ICFs, insulated concrete forms intended for basement wall construction. The one I am looking at (Super-Forms) has 6 7/8" thick internal cavity and there are provisions for re-bar to clip in. They recommend 3500 psi concrete be pumped in these forms and claim a 30% strength increase due to slower cure times. My "idea" is to dig and pour a footing below the frost line, pour 5' high walls using the ICFs, and drop in an EDPM (rubber sheet) pond liner and fill with water. My "question" is how can I figure if this type of construction will stand up to the hydraulic pressures of 5' of water? Suggested re-bar size/placement. Other reinforcements? Is this even advisable? The use of these forms will save me considerable $ as I can do most of the work myself. Any thoughts???
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