City of Brighton

Services

Hydrologic Modeling · Drainage Design · Channel Design · Hydraulic Analysis · Detention Design

The City of Brighton contacted JR Engineering to design the Sable Boulevard widening from E 120th Avenue to Bromley Lane, approximately four miles.  A critical component of the design of the roadway corridor was regional drainage, including master-planned concepts that had not yet been designed. After preparing alternatives and conceptual designs for the several regional drainage components, JR was contracted to complete the final design of the Sable Boulevard Regional Outfall from 140th Avenue to the existing South Brighton Regional Outfall channel.

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Watershed Planning & Hydrologic Modeling

JR updated the Outfall Systems Plan hydrologic modeling and mapping with new development-specific information.  Of the roughly 1,450-acre Sable Boulevard Regional Outfall watershed, 510 acres were development in progress to be detained and treated for water quality in multiple in-series detention facilities, and 935 acres were future development areas with no formal drainage plan. JR prepared watershed master-planning and developed an over-detention scheme to optimize the peak flows in the Sable Boulevard Regional Outfall to work with the shallow road culvert crossings and limited right-of-way width.

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Regional Outfall Design & Construction

JR Engineering designed a one-mile long open channel system that included crossings of the Fulton Ditch and three City roadways.  The project involved Mile High Flood District (MHFD) funding and maintenance eligibility, and MHFD contributed a geomorphologist (ERO Resources) to the project team.  Sediment transport and deposition was a primary concern, based on maintenance records of similar drainage facilities in the area.  JR and the project stakeholders developed a concept for the channel involving a contiguous concrete trickle channel along the channel bottom for ease of maintenance, due to the significant runoff contribution from adjacent agricultural areas as well as irrigation return discharges. At culvert crossings, recessed concrete sediment basins were created at the culvert entrances to encourage localized sediment deposition for ease of collection and maintenance. Channel hydraulics were carefully considered to ensure that sediment transport occurred in the channel reaches, and to ensure that sediment deposits in the basins would not be dislodged during higher flow events. JR Engineering performed survey and SUE services, managed right-of-way acquisition as part of the Sable Boulevard widening project, and managed relocation of private utilities.

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Construction of the Sable Boulevard Regional Outfall was awarded to Naranjo Civil Constructors.  MHFD and JR Engineering managed construction of the Sable Boulevard Regional Outfall.