I'm reviewing new developments for sanitary sewers. Usually I've seen sanitary sewer analyzed by capacity, using mannings (pretty simple). But I have a developer providing computation for an existing over capacity pipe section. They are providing inlet water surface and max water surface elevation and stating "while under capacity per mannings equation, HGL computation shows that HGL stays below the crown of the pipe, there fore the section of existing pipe is adequate. How can it be adequate if the pipe section is under capacity per mannings? I'm new to pipe design review. Any help is appreciated
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