Pipe-Arch Shape

The Pipe-Arch shape originates from FHWA publications, and differs slightly from the more generically defined "Arch"-305 shape from SWMM. Currently, a conduit may given a Pipe-Arch conduit shape only when the conduit type is a conduit catalog reference. Pipe-Arch shape is supported by the GVF-Rational and GVF-Convex solvers. In addition to Rise and Span, the cross sectional characteristics of a Pipe-Arch include:

Rc = Corner Radius

Rb = Bottom Radius

Rt = Top Radius

B = Bottom Distance

Full Area = cross sectional full flow area of the pipe