Title
Intergovernmental Agreements with Flood Control District of Maricopa County for Paradise Ridge Flood Control Project Under Capital Improvement Projects Prioritization Process (Ordinance S-46461)
Description
Request City Council approval to authorize the City Manager, or his designee, to apply for, accept funds, and enter into Intergovernmental Agreements (IGAs) with the Flood Control District of Maricopa County (FCDMC) for the Paradise Ridge Flood Control project under the Capital Improvement Projects Prioritization Process (CIPPP). Further request authorization for the City Treasurer to accept, and the City Controller to disburse, all funds related to this item. The preliminary estimate for the overall project is estimated at $32 million, which will be split 50/50 between the City ($16 million) and FCDMC ($16 million) for project design development, right-of-way acquisition, utility coordination/relocation, and construction implementation.
Report
Summary
The FCDMC's CIPPP identifies potential capital projects for FCDMC participation. Flood control projects recommended through this procedure may become eligible to receive future FCDMC funding, subject to budgetary constraints and contingent upon approval by the FCDMC's Board of Directors.
Currently under separate project development and implementation is the upstream Rawhide Wash Flood Hazard Mitigation project in the City of Scottsdale. The project improvements include construction of new floodwalls and levees, augmentation of existing floodwalls and levees, and containment facilities and would reduce the existing floodplain. After completion of the proposed project, approximately 960 acres of developable land within City of Phoenix jurisdiction (Paradise Ridge Area) would no longer be designated in a Federal Emergency Management Agency (FEMA) special flood hazard delineated floodplain and approximately 1,710 acres of floodplain would remain.
Floodplain Management staff, in collaboration with the Planning and Development Department, recommends submission of the Paradise Ridge Flood Control project for consideration for future funding under the FCDMC's CIPPP. This project would be the continuation of the upstream Rawhide Wash Flood Hazard Mitigation project in the City of Scottsdale that would extend into the City of Phoenix. The northern limit of the project is at the Scottsdale Road bridge outlet and the project extends approximately 3.5 miles downstream with a southern limit at the impoundment of the U.S. Bureau of Reclamation Dike No. 2 just north of the Central Arizona Project canal. The project would consist of an engineered natural desert trapezoidal channel with pertinent facilities and engineered structural elements to provide the conveyance and contain the existing floodplain within a new proposed channel. This project would ultimately remove the remaining 1,710 acres in Phoenix’s Paradise Ridge Area from the floodplain. FCDMC will be the lead agency for the development of the project.
Financial Impact
Paradise Ridge Flood Control Project: The total estimated project cost is approximately $32 million dollars with a proposed FCDMC / City of Phoenix 50/50 cost share. It is anticipated that funding for the City portion will come entirely from the new Paradise Ridge Drainage Impact Fee recently adopted by Council.
Concurrence/Previous Council Action
This item was recommended for approval at the Transportation, Infrastructure and Innovation Subcommittee meeting on March 4, 2020 by a vote of 4-0.
Location
The northern limit of the project is at the Scottsdale Road bridge outlet and the project extends approximately 3.5 miles downstream with a southern limit at the impoundment of the U.S. Bureau of Reclamation Dike No. 2 just north of the Central Arizona Project canal.
Council District: 2
Department
Responsible Department
This item is submitted by Deputy City Managers Mario Paniagua and Karen Peters, and the Public Works, Street Transportation and Planning and Development departments.