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Worked on 35 large culvert designs in the last 2 years.

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Worked in 6 counties and 4 ODOT districts in relation to large culvert designs.

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Performed 10 drainage related studies in the last year.

Drainage Design

Environmental Design Group has in-depth knowledge and understanding of the drainage design prescribed in ODOT’s L & D Manual Vol. 2, particularly Sections 1104-Storm Sewers and 1105-Roadway Culverts. We also have an in-depth knowledge of the requirements for many County Engineers and municipalities. Our team has significant experience using Stream Stats for drainage areas and storm water flows as well as using the Rationale Method, TR-55, Critical Storm Method, and USGS open file report 2432 for urban streams to calculate flows.

We have a wealth of knowledge and experience using various software programs to determine drainage areas and stormwater flows (Stream Stats, TR-55, Rational Method, and others). We have experience with feasibility studies, environmental documentation, permits, construction documents for all levels of site complexity, including deep culverts and complex roadway drainage.

Our staff has the depth of knowledge to handle your infrastructure drainage needs from assessment through design and construction. We regularly assist clients in asset management by assessing and developing maintenance and replacement plans for drainage assets. Our team routinely develops drainage designs for roadway projects including open and closed drainage systems as well as stand alone large culvert designs.

Drainage Design Services

  • Complex Drainage Studies
  • SWPP Design
  • Post Construction BMP Recommendations and Design
  • Culvert Assessments and Reports
  • Rehab/replacement Plans for Drainage Structures
  • Maintenance of Traffic Drainage Design
  • Storm Sewer and Drainage Infrastructure Design
  • Highway, Roadway, and Intersection Drainage Design
  • Stormwater Management Design
  • Drainage Improvement Cost Estimates
  • Open Water Course Design – Ditches
  • Roadway Drainage Design – Enclosed Pipe Flow/Gutter Flow
  • Headwall and End Treatment Design