water surfaces problem

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Nat
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water surfaces problem

Nat
Hello

I have got a problem with my model.

I have a project that constricted the banks. (This project is a continuation of a  platform which already blocks the flow on the right bank).
When I modelized my additional platform (located upstream of the first), for the same flow, Hec Rac calculates lower water surfaces.(Manning's values are the same)

Is it because the flow area does not change significantly when the wet section greatly increases?

Do you have another suggestion?

Thanks