Pipe Trench with a Road-datum surface and a Rock-surface

Volume calculation for a Pipe Trench can range from easy as pie to complex as a maze. One aspect that complicates matters is that there is infinite (at least it feels like it) number of section layouts, and all of them need to be considered when creating a method for volume calculating. Almost everything is solvable though, and this post will explain what you need when working with multiple surfaces.