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This multi-faceted project provided infrastructure solutions for an open space and Transit Oriented Development (TOD) at the Metro Center light rail station. The site resides on a 1600-acre regional drainage basin, and the purpose of the stormwater design was to convey excess flow from the City Center basin to the City Center Pond. The Transit Oriented Development will include multi-family housing, mixed-use retail, walkable pedestrian access to the RTD Light Rail, open space and park facilities, and other TOD elements.


Stormwater planning and solutions for the project included 2300 LF of 84” – 108” RCP, detention facilities, pipe hydraulics, Hydrology & Hydraulics (H&H), FLO-2D analysis, SWMM analysis, CUHP analysis, StormCAD calculations, UD-Sewer Calculations, outfall analysis, drainage studies, and watershed analysis.


During the analysis, it was discovered that 1200 cfs of stormwater were not captured by the existing storm sewer, and two type-R inlets were added to help capture the flow. In addition, the pipe system connects to a regional detention facility with large bubbler structure that doubles as an aesthetic pond and trail system. The pedestrian crossing will experience flooding during the 100-year event, and a warning light system will keep pedestrians out of the underpass during storms.


The project required two large water line relocations. In addition, we designed the lowering of 36” potable waterline, considered the various forces acting on the pipe and bends to design restraints and thrust blocks, and added a blow off and air vac. We designed the rerouting of an 8” waterline, adding various bends to the line. Finally, Calibre analyzed sewer lines for capacity, and the resulting alternative lowered two existing sanitary sewer mains and added manholes and drop manholes to the existing system.


From a recreation perspective, Calibre provided designs for a multimodal trail system to connect the RTD light rail station to the Highline Canal, including a pedestrian box culvert under Alameda (136-foot Conspan Arch pedestrian box culvert). The pedestrian element was added to meet the project goal of maximizing recreational potential and pedestrian amenities. The pedestrian crossing will experience flooding during the 100-year event, and a warning light system will keep pedestrians out of the underpass during storms. Trail system was designed in conjunction with Stream Landscape Architecture. 


The Sable City Center project bordered park property that was slated for future improvement. Although the park was not specifically part of the project, the parcel is highly influenced by the work. Calibre worked closely with Aurora PROS to place the pedestrian crossing, develop grading, set pipe alignments, develop preliminary landscape plans, and contemplate future park uses.

An aesthetically pleasing detention pond, bubbler, stadium seating, bicycle racks, and open space are prominent features of the trail system and park space.


For roadway infrastructure and reconstruction, a shoofly roadway design raised east bound lanes of Alameda one-foot, moved the lanes over to allow room for construction, and moved cars back after construction.

Sable Basin, Utility Design, Alameda Rd, Underpass, Park, and Trail System, Auro

  • Services Project Type 

    •    Water
    •    Storm 
    •    Sanitary Sewer

    •    Infrastructure
    •    Public Sector (Municipal)
    •    IDIQ and On-Call


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