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:*EntryC_or_WSa: the entry loss coefficients (default = 0.5).
:*ExitC_or_WSb: the exit loss coefficients (default = 1.0).
TheseThe attributes (entry/exit loss coefficients) are determinedadjusted based byon the equations in the figure below, which consider the extent of flow contraction/expansion. For example, a clear spanning bridge over a stormwater channel does not cause any contraction/expansion. Therefore, the change in approach velocity, structure velocity and the departure velocity are effectively the same, and the loss coefficients can be automatically reduced based on the following equations:
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[[File:Structure_Contraction_Expantion_Losses.png|600px]]
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