2019 Drainage Design Manual

The 2019 Drainage Design Manual (DDM) has been removed from the Hydraulics website while it is being updated to comply with Colorado Department of Transportation Procedural Directive 31.1 and the State of Colorado's accessibility requirements. To access the 2019 DDM PDF's please contact either the State Hydraulic Engineer at [email protected] or a Regional Hydraulic Engineer contact found in the table here. Thank you for your patience and understanding while the CDOT Drainage Design Manual is updated to insure accessibility requirements.