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State Highway Administration

Highway Drainage Manual

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This manual provides the design criteria for highway drainage. Hydrologic data for use with the Rational Method and SCS TR55 is included. Design charts and nomographs are included to assist in design computations.

Available from:
Cashier Office
211 E. Madison Street
Baltimore, Maryland 21202
  • A partially downloadable version is available below.
    • Part I - Division of Highway Development (PDF 4.3 Mb)
    • Part II - Division of Bridge Development has been superceeded by the "Manual for Hydrologic and Hydraulic Design" which is generally applicable where drainage areas exceed 1 square mile and for all bridge openings.
    • Part III - Environment Criteria and Procedures Bureau of Landscape Architecture
    • Part IV - Appendicies
      1. Glossary (PDF 939 Kb)
      2. References (PDF 0.4 Mb)
      3. Design Charts - Have been mostly superceeded by the various software programs
        1. Open Drainage Systems
          1. Conveyance Ditches and Channels - use FHWA Hydraulic Toolbox v4.10
          2. Headwater - use Culvert Headwater Calculator (HDS-5) or FHWA HY-8 v7.2
        2. Storm Drainage Systems
          1. Inlets and Gutters - use FHWA Hydraulic Toolbox v4.10
          2. Pipes - use approved software
        3. TR-20 Input Forms - use WinTR-20
        4. Design Forms (PDF 2 Mb)
      4. Design of Corrugated Metal and Aluminum Pipes (PDF 1.7 Mb)

Highway Drainage Manual Design Guidelines

The Design Guidelines supplement the Highway Drainage Manual and supercede any and all previously issued manuals, directives and guidelines.

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Maryland Department of Transportation


707 North Calvert Street Baltimore, Maryland 21202