- Arvada Van Bibber Flood Creek Protection
Substantial residential and commercial areas of Arvada, Colo., a Denver suburb, were subject to flooding from Van Bibber Creek. The Van Bibber Creek Flood Protection Project is a Section 235 CAP project locally sponsored by the City of Arvada and the Denver Urban Drainage and Flood Control District. The project was designed to provide the authorized 50-year level of flood protection using conservative hydraulic loss estimates, and a 100-year level of protection using more commonly employed loss parameters. The U.S. Army Corps of Engineers - Omaha District issued task orders to Burns & McDonnell for the detailed hydraulic analysis, final design and construction plans and specifications for the project.
- Urban flood protection
- Hydraulic modeling
- Channel improvements
- Utility systems design and relocation
- Roadway bridge design
- Detailed construction sequence planning using Primavera
- Cost estimation using MCACES Gold
The 6,000-foot project length is divided into three distinct reaches by the nature of adjacent development and topography. The downstream reach consists of 1,600 feet of double 14.5-foot by 8.5-foot reinforced concrete box (RCB) constructed on a curvilinear alignment through two active shopping centers and across Independence Street and 58th Avenue, both urban arterial roadways. Extensive and highly detailed demolition, restoration and traffic control plans were required for this reach of the project, which terminates in a reinforced concrete drop structure at Van Bibber’s confluence with Ralston Creek. The coordination and planning of a wide array of utility relocations was necessary in this reach of the $9 million project.
The central reach of the project, which extends upstream from 58th Avenue approximately 1,400 feet to New Kipling Parkway, was constructed on a former public works department maintenance yard, and consists of a trapezoidal open channel. To provide a stable channel on the steep gradient of this reach, it was necessary to include two grouted stone boulder drop structures with a maximum drop height of 6 feet. This reach also includes a reinforced concrete drop structure with a drop height of 5 feet immediately downstream of existing bridges on New Kipling Parkway, a four-lane divided roadway.
The upstream reach of the project was situated on property owned by the Jefferson County Recreation District, which was in the process of planning a major redevelopment of its existing recreational facilities. Burns & McDonnell and the local sponsors worked closely with the Recreation District to develop a design closely coordinated with those redevelopment plans, and that met the project flood protection requirements. A series of highly differing channel sections were included in this reach, which also included a new roadway bridge for access to the park, two grouted stone boulder drop structures and modifications to an existing roadway bridge at its upstream end.
The Federal Emergency Management Agency (FEMA) has issued a conditional letter of map revision (CLOMR) for this project and was expected to issue a final letter of map revision (LOMR) upon completion of the project, removing substantial areas of Arvada from the regulatory floodplain.
- Dually designed to meet parallel flood protection levels utilizing various hydraulic loss design parameters
- Extensive hydraulic analyses with FESWMS and HEC-RAS
- Coordination with numerous public and private sector stakeholders
- Structural and non-structural solutions
- Grouted stone boulder drop structures
- Extensive maintenance of traffic design for urban arterials
- Complete demolition and restoration design for phased constuction in heavily urbanized area