Arch Shape

The cross sectional shape of an Arch link is loosely defined by its Span and Rise. When computing using the Implicit or Explicit (SWMM) engine in CivilStorm or SewerGEMS only these two parameters are required. The remaining attributes are derived based upon internal look-up tables native to the EPA-SWMM computations, and therefore, differs slightly from the "Pipe-Arch"-306 conduit shape. The GVF-Rational and GVF-Convex solvers also support the Arch conduit shape selection.