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Lesson 10- Culvert and Ditch Sizing

Lesson 10: Culvert and Ditch Design (HM Chpt 3 & 4) Understand the different types of culverts Know the Culvert design process for conveyance Complete a roadway Culvert design using nomographs and determine headwater to diameter ratio (HW/d) Discuss the roadway Ditch design and review the design criteria Objectives .. ~WSDOT Culvert Design A Culvert is a closed conduit under a roadway or embankment used to maintain flow from a natural channel or drainage Ditch . A Culvert should convey flow without causing damaging backwater, excessive flow constriction, or excessive outlet velocities. There are culverts for: conveyance fish passage (HM Chapter and HM Chapter 7) Temporary conditions (HM Chapter ) We will focus on a conveyance Culvert in this Lesson Culvert Design Culvert Design.

longitudinal ditch slope for grass lined ditches • Trapezoidal section is preferred by “V” ditch is OK too • Maximum ditch side slopes of 2:1 • Ditches are not biofiltration swales • Make sure the 10 year water surface elevation is not equal to the critical depth •

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