You can use an expression for Manning’s equation to label pipes, in plan or profile view, in order to display their flow capacity. This process was developed by Jeffrey Old, a licensed P.E., and AEC Solutions Engineer with Hagerman & Company, Inc., based in Mt. Zion, Illinois, USA (http://www.hagerman.com). Jeffrey has provided advice on how to use expressions to design pipes hydraulically, as well as an explanation of how these expressions work.