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Re: Contraction and Expansion Reach Lengths for Bridges
i can understand part of your problem.
ignoring the second bridge in the expansion reach is not a good options but in fact you may treat it separately by considering dual bridge effect . you can get all those paper in hydraulic bulletin or journals and it is not mentioned in any Hec manual
under the bridge you may define n values as 0.045 and the reach downstream as 0.075. the algoritm of the model take charge of that. there is no necessity to average it out.
Just some thoughts. hope it help
cheers
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