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Curb Inlet in sag with local depression and long opening returns weird results for depth and spread.
Download and install the latest patch set (1/28/16 or later).
Note: This is only relevant to gutters with atypical lengths (>12ft).
Calculations are based on section 22.214.171.124 of FHWA HEC-22 Urban Drainage Design Manual (3rd Edition).
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