There is a section of Rock were if we cast a concrete bulkhead it will dam off a sizable amount of water
and allow entry by walking down a smooth Rock surface.
What I am looking for is any concrete formulas which will tell me the thickness we need to use told hold back (X) height of water. I can Eyeball and make what I think would be a safe cast but since the Wall will contain filter lines and electrical conduits I want to know what the minimum should be. The concrete guys are balking as it seems to be something they haven't actually done without back filling behind the wall or using Gunite. They mostly pour cast foundations. I have text books with formulas on how to calculate water pressure as a function of height. It seems to me there should be a simple formula for the Thickness of concrete needed but I can not come across one. The only Bulkheads I have seen cast were for seawalls and back filled with tamped soil. Not quite the same. Any body come across this problem ?
Thanks in advance for any help.