Matrix was retained by the Urban Drainage & Flood Control District to complete the Cherry Creek Stabilization Plan Update. An HEC-RAS model version 4.1.0 was developed for the entire 12.2 mile reach between the confluence with the South Platte River and the outlet of the Cherry Creek Dam. The hydraulic model included a total of 73 bridges and 39 drop structures. The study was cosponsored by the City & County of Denver, the Southeast Metro Stormwater Authority (SEMSWA), and Arapahoe County. A detailed hydraulic model was prepared to delineate existing channel hydraulics, floodplain impacts, and channel shear stress. The hydraulic model allowed the team to test proposed stabilization measures for impacts to the 100-year floodplain.

The hydraulic model analysis of Cherry Creek also examined shear stress as it varied along the channel corridor. Incised areas, where the Creek’s energy is concentrated on a narrow area, generally have a higher shear stress and are expected to be erosional areas. Shallow and wide areas of the channel, where energy is dispersed, tend to have low shear stress resulting in deposition.

These values were analyzed for the two flow events: (1.) during the Cherry Creek Reservoir Dam outlet flushing release of 1,500 cfs, and (2.) during a 100-year flood. The lower flow rate shear stress analysis examines a typical flood event, whereas the 100-year event is generally the highest shear stress anticipated for the channel. Other hydraulic parameters were also evaluated using the model such as flood depth and velocity. 

Services included:

  • Floodplain Mapping
  • Hydraulic Modeling and Analysis
  • Watershed Planning
  • Infrastructure Assessment and  Master Planning
  • Channel River Restoration and Channel Design
  • Channel Stability Analysis
  • Hydrologic Modeling and Analysis