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The momentum equation (used for unsteady flow calcs) integrates forces acting over the surfaces and end of the control volume and the impacts of flow expansions/contractions are captured in the forces on the upstream and downstream ends of that control volume. Thus, the C/E coefficients are not used.
Unsteady flow calcs at structures are done using the results of the geometry pre-processor. You could run the pre-processor by itself to develop a family of curves for your bridges and culverts.
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