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Curb Inlet in sag with local depression and long opening returns weird results for depth and spread.
For example, there is a sudden jump in gutter depth and spread when the curb opening length is greater than 12 feet.
Download and install the latest patch set for SELECTseries 5 (2016-Jan 28 or later), or upgrade to a newer version when available.
Note: This is only relevant to gutters with atypical lengths (>12ft).
With this fix, calculations now properly conform to section 4.4.5.2 of the FHWA HEC-22 Urban Drainage Design Manual (3rd Edition).
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