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F-2. SUPPLEMENTAL WATERSHED AGREEMENT FOR THE POWERLINE FLOOD RETARDING STRUCTURE Approve the Supplemental Watershed Agreement FCD 2013A005 for the Supplemental Watershed Plan / Environmental Assessment for the Powerline Flood Retarding Structure. A Supplemental Watershed Agreement is required by the Natural Resources Conservation Service (NRCS) project authorization process at the end of the planning phase of dam rehabilitation projects. The Supplemental Watershed Agreement is an agreement between NRCS and the local sponsors, which are the Flood Control District (District) and the East Maricopa Natural Resources Conservation District. This Supplemental Watershed Agreement allows for the specific dam rehabilitation alternative that has been selected to move forward to final design and construction. In addition, the Supplemental Watershed Agreement outlines the intended project cost share participation by NRCS and the District, authorizes NRCS to seek federal funding for the project and provides formal notification that the District is ready, willing, and able to proceed with the project. The Supplemental Watershed Agreement is not, however, a cost share agreement. This term of this agreement is for the installation period and evaluated life of the project (103 years). The Powerline Flood Retarding Structure (FRS) is one of three earthen flood retarding structures (Vineyard Road FRS and Rittenhouse FRS are the other two) located in northwestern Pinal County, east of the Central Arizona Project (CAP) canal and south of Baseline Road. The Powerline, Vineyard Road, and Rittenhouse FRSs Rehabilitation or Replacement Project (Project) was a District sponsored planning study which analyzed alternatives and selected a preferred alternative that would; correct the dam deficiencies, maintain the flood control benefits to downstream properties, and comply with state dam safety requirements. The selected alternative for Powerline FRS involves replacing Powerline FRS with a channel system that discharges into the Vineyard Road FRS flood pool. The Powerline FRS is a structural plan element of the Apache Junction-Gilbert Watershed Work Plan. Therefore a Supplemental Watershed Plan and Environmental Assessment (Plan/EA) was prepared that presents the alternatives evaluated and the preferred alternative for Powerline FRS. A separate Supplemental Watershed Plan/EA and Supplemental Watershed Agreement have also been prepared for the Vineyard Road FRS and Rittenhouse FRS as these two dams are structural elements of the Williams-Chandler Watershed Work Plan. The District has also coordinated with and obtained input on the PROJECT from the Arizona State Land Department (ASLD), local stakeholders and the public. This item impacts Supervisorial Districts 1 and 2. (C-69-14-003-3-00)