Asbury Outfall

Denver, Colorado

Tsiouvaras Simmons Holderness is the civil engineering firm responsible for the design of the Asbury Outfall project to help relieve flooding around Broadway and Evans and the neighborhood to the west of this area. The upstream end of the outfall begins just east of South Broadway from Wesley Avenue to Evans Avenue where the runoff from more frequent storms is completely captured and larger storms are brought into compliance with City criteria. The outfall includes a 72-inch storm sewer that will be bored under the BNSF railroad, light rail, and South Santa Fe Drive. Numerous large utilities are present along the alignment for the Asbury Outfall, including a 30-inch Denver Water line, a 48-inch Metro Wastewater line, and various smaller water, sewer, and private utilities. These utilities were largely avoided by using special manhole structures to compensate for needs outside of the typical design.

  • Parallel storm sewer system design to alleviate flooding from 100-year storm events
  • Large diameter storm sewer hydraulic analysis
  • South Platte River outfall hydraulic analysis and structural design