Transcription of CHAPTER 5 CULVERTS - Michigan
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CHAPTER 5 CULVERTS - Michigan
CHAPTER 5 CULVERTS NOTE: All questions and comments should be directed to the Drainage Specialist, Design Support Area. Revised September 2009 CULVERTS 5-2 MDOT Drainage Manual CHAPTER Table of Contents Introduction/Purpose 5-5 Definitions 5-6 Policy and Design Criteria 5-9 Introduction 5-9 culvert Policy 5-11 culvert Pipe Class Designation 5-12 culvert Usage Guidelines 5-12 culvert Environmental Permit Requirements 5-13 culvert Design Considerations 5-13 End Treatment (Inlet or Outlet) 5-17 Pipe End Treatments 5-20 Boxes/Slab End Treatments 5-21 Weep Holes 5-23 culvert Extensions and Replacements 5-23 Bedding and Filling Around Pipe CULVERTS 5-25 Related Designs 5-25 Design Guidance and Procedure 5-26 Approach 5-26 Inlet Control 5-26 Outlet Control 5-29 Outlet Velocity 5-35 Roadway Overtopping 5-36
the inlet will accept. The control section of a culvert operating under inlet control is located just inside the entrance. Critical depth occurs at or near this location, and the flow regime immediately downstream is supercritical. Hydraulic characteristics downstream of the inlet control section do not affect the culvert capacity. The upstream
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