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Chapter 3 Culvert Design - Washington State Department of ...
www.wsdot.wa.govHydraulics Manual M 23-03.06 Page 3-1 April 2019 Chapter 3 Culvert Design 3-1 Introduction A culvert is a closed conduit under a roadway or embankment used to maintain flow from a natural channel or drainage ditch. A culvert shall convey flow without causing damaging . backwater, excessive flow constriction, or excessive outlet velocities.