Design and Construction of Bridge Scour Countermeasures on the Salt River, Phoenix, Arizona
Year: 2002
Type: conference-paper
Abstract: The U.S. Army Corps of Engineers, the City of Phoenix, Arizona, and the Maricopa County Flood Control District are working together on a habitat restoration project for a reach of the Salt River within the City of Phoenix. The project includes construction of a low-flow channel that follows the historic alignment of flows of the Salt River channel. The constructed low-flow channel is as much as 61 m (200 ft) wide and up to 3.66 m (12 ft) below the pre-project channel invert. There are five highway bridges that span this reach of the Salt River. One of these bridges is founded on spread footings with the top of the footings 4.6 to 6.1 m (15 to 20 ft) below the pre-project channel invert. Another bridge is founded on steel pile footings, approximately 12.2 m (40 ft) below the pre-project channel invert. Both hydraulic and structural countermeasures were evaluated for the two bridges. Hydraulic countermeasures included a bed armoring alternative and two local scour armoring alternatives. The recommended alternative at both bridges was a roller compacted concrete (RCC) apron located within the low-flow channel with a RCC grade-control structure at the downstream end of the apron. The RCC apron provided a higher level of protection than either of the local armoring alternatives. The paper discusses the alternatives evaluated, factors considered in selecting the RCC apron alternative, and the cost of the selected alternative.
Author: Dennis L. Richards
Language: English
Subfield: Earth-Surface Processes
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W652886873