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Derek Johns

Derek D. Johns, PE

Principal | Group Manager, Stormwater

Employee since 2000

Shareholder since 2005

Derek helps lead Muller’s Stormwater group. In this role, he guides teams responsible for design, management, and construction oversight for a wide variety of stormwater and stream restoration projects.

His professional experience includes stream restoration and natural channel design, stormwater detention and water quality facilities design, hydraulic structures, bioengineering, vegetative swales, sediment transport, bridge scour, culvert and storm sewer design, hydrologic studies, floodplain studies and map revisions, master planning, and construction management. Derek has been involved in advancing regional techniques for natural stream restoration design and stormwater management. He was the co-developer of void-filled riprap that emulates natural rock riffle material and developed standard approaches for sizing rock in riffle and cascade structures that have been adopted by Mile High Flood District in their standard criteria. He is a professional engineer in Colorado and a member of the Colorado Association of Stormwater and Floodplain Managers. Derek has authored or co-authored multiple publications for professional associations and journals, including Land and Water Magazine and the Journal of Hydraulic Engineering.

Areas of Expertise

  • Stream Restoration 
  • Bridge Scour and Stream Stability
  • Sediment Transport
  • Hydrologic Studies
  • Stormwater Detention Basins
  • Water Quality Facilities
  • Open Channels 
  • Construction Oversight
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