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Where can I find documentation on the computation scheme StormCAD (GVF-Rational solver) profile calculations?
StormCAD (GVF Rational solver) uses the Direct Step Method for flow profile calculations, and does not use the Bernoulli equation. The Direct Step Method is discussed in the textbook Stormwater Conveyance (section 7.8, page 275).
Textbook: "Stormwater Conveyance Modeling and Design"