Question about structural integrity of concrete blocks and mortar
My present plan is to build a rectangular pond with a liner that is partly below ground level and partly above ground level. The pond will be made of concrete block (8" x 8" x 16") and mortar. The pond will be approximately 8 feet wide and 24 feet long.
Due to the location I think that I may only be able to go about 20-24 inches deep. As such I expect to have 16 inches of pond wall below ground (about 2 concrete blocks) and about 24 inches of pond wall above ground (about 3 concrete blocks). My concern is the sheer weight of water on the 24 inches above ground that pushes outward. Will it need some type of extra reinforcement to contain this amount of water and prevent the mortar joints of the pond wall from cracking/breaking?
If I can manage to get 3 concrete blocks below ground then there would be 16 inches of pond wall (2 blocks) above ground. Would this be able to hold this weight of water or would it also need reinforcement? In both cases this is a LOT of water.
I would prefer to not fill the hollow concrete blocks with concrete and rebar ($$$$) to reinforce them, but will if anyone has experience in this area with the materials. If anyone has any suggestions for a lower cost means to reinforce the wall IÂd love to hear it. NOTE: For aesthetic reasons due to location, between 16" to 24" must be above ground.
Your thoughts on this are welcome.