Project Name: Powerline/Vineyard Road/Rittenhouse FRS Rehab
Project is in Supervisor District:
- District 1: True
- District 2: False
- District 3: False
- District 4: False
- District 5: False
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Project Type: Engineering/Design
The Powerline, Vineyard Road and Rittenhouse (PVR) Flood Retarding Structures (FRS) are located in northwest Pinal County (south of Apache Junction and parallel to the Central Arizona Project canal between Baseline Road and Ocotillo Road). The District operates and maintains the structures by agreement with the Natural Resources Conservation Service. The FRS protects approximately 72 square miles of residential, commercia, and agricultural land in Maricopa and Pinal counties from being flooded. Protection is also provided to structures such as the Central Arizona Project canal, Phoenix-Mesa Gateway Airport and the Loop 202 Santan Freeway.
The Arizona Department of Water Resources reclassified the PVR FRS as "high hazard potential structures” to indicate that they protect substantial amounts of infrastructure and a large population. In July 2002, the District prepared a Final Failure Mode Analysis Report, Structures Assessment Program Phase I (FFMA) that identified defects in the structures due to the age of the structures, proximity to earth fissures, land subsidence of the area, and cracking caused by drying shrinkage. The FFMA recommended rehabilitation of the structures which could include structural improvements to the dam or replacement of the dams with channels, basins or other flood control facilities.
A planning study was started in 2009 to evaluate alternatives for the rehabilitation of the structures. During the planning study, the alternative selected was to replace the Powerline FRS with a channel that flows into the Vineyard Road FRS floodpool, convert Rittenhouse FRS to a levee that discharges into Vineyard Road FRS floodpool, and then to raise and rehabilitate Vineyard Road FRS. However during the design phase, it was determined that the Rittenhouse Levee would not function properly so Rittenhouse FRS will remain a dam. Therefore, the selected design project is for the Powerline FRS to be replaced with a channel and the Vineyard Road and Rittenhouse FRSs raised and rehabilitated.
Last Updated: 2/24/2021 11:30:50 AM
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