Fluid dynamics whoa. Hope you figured it out right then add a little more for safety factors. I've built some forms for cement before. Didnt use any math,but yeah there were some unexpected pressure forces I underestimated. No major setbacks but I was real nervous for a bit. I little planning goes a long way. Like you were saying, It separates the men from the monkeys. I'm a bit of a clever monkey. Just past dumb, smart enough to know when to ask for help. So I'm beyond dunning Kruger effect at least. It good to have guys like you around. Especially guys with the ability and patience to teach.