1. The problem statement, all variables and given/known data Calculate the depth h of mud for which the 3m concrete retaining wall is on the verge of tipping about its forward edge A. The density of mud may be taken to be 1760 kg/m3 and that of concrete to be 2400 kg/m3 3. The attempt at a solution So I made A actually at 1.5m down from the top of the concrete wall. I figured Rb=R from the mud because of Sum of Fx. Then I just considered the weight of the wall as well. I assumed for a 1m wide slab.