No specific info about version 7.4. Please visit the main page of HY-8 Culvert on Software Informer.
CulvertMaster is the best tool available for solving culvert hydraulics problems
Design concrete box culverts, wingwalls, headwalls, and cutoff wall.
Program for detention ponds, storm sewers, culvert design, and channel modeling.
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CulvertMaster allows you to effectively analyze existing culverts.