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COUNTYoi SAN MATEO <br />DEPARTMENT OF PUBLIC WORKS <br />FLOOD RESILIENCE PROGRAM <br />Exhibit A <br />Bayfront Canal and Atherton Channel Flood Management and Restoration Project <br />Prepared by County of San Mateo <br />October 24, 2017 <br />Purpose: <br />The purpose of this MOU is to complete the planning, design, environmental permitting, and secure <br />property access rights for the Bayfront Canal and Atherton Channel Flood Management and Restoration <br />Project (Project) on behalf of the Cities of Redwood City and Menlo Park, the Town of Atherton (Cities), <br />and the County of San Mateo (the County) also referred to as the Bayfront Canal/Atherton Channel <br />Collaborative (Collaborative). This MOU is for design only, does not include construction and operation <br />and maintenance activities, and does not bind any member agency's participation in construction or <br />operations and maintenance activities. This is the first in a series of anticipated future projects that will <br />provide flooding relief to this cross jurisdictional region. <br />Project Background: <br />The Bayfront Canal is located just north of Highway 101 in the City of Redwood City. The Bayfront Canal <br />extends from west to east, from Douglas Court to Marsh Road and is bounded to the north by Cargill's <br />salt ponds and to the south by residential and industrial properties. The Atherton Channel has <br />approximately 6.5 square miles of tributary drainage area and discharges into the Bayfront Canal near <br />Marsh Road. The Bayfront Canal has an additional 3 square miles of tributary drainage area, most of <br />which is located on the south side of Highway 101. The combined flow from the Atherton Channel and <br />Bayfront Canal, a total of 9.5 square miles of contributing area, discharges into Flood Slough through a <br />tide gate control structure. The watershed area, Project location, and planned future projects within the <br />watershed are summarized in Figure 1. <br />Hydrology: <br />The peak flow rates from the Bayfront Canal Hydrology and Hydraulic Evaluation, prepared for Stanford <br />Hospital & Clinic in June 2017 by BKF, was used to calculate the proportional jurisdictional flow based on <br />watershed areas. The flow contribution percentages presented in Table 1 will provide a baseline funding <br />strategy. These contributions will be expanded upon based on participation and for funding of the <br />construction and operation and maintenance phases of the Project. A reduction of flow contributions per <br />jurisdiction will be evaluated if upstream detention and storm water capture projects are implemented <br />within the watershed. <br />Table 1. Jurisdictional Contributions <br />Jurisdiction <br />Watershed <br />Flow <br />Financial <br />Financial <br />Area <br />Contribution <br />Contribution <br />Contribution <br />1 Town of Atherton <br />1 44 <br />38.0 <br />16.5 <br />165,000 <br />1 City of Redwood City <br />1 13 <br />26.0 1 <br />36.2 <br />1 362,000 <br />1 San Mateo County <br />20 <br />22.0 1 <br />31.3 <br />313,000 <br />1 City of Menlo Park <br />1 <br />17 <br />10.5 1 <br />16.0 <br />160,000 <br />1 Town of Woodside <br />6 <br />3.5 1 <br />0.0 <br />0 <br />This Project is the first step towards providing capacity for future projects within the watershed to reduce <br />flooding. The most recent proposed solution that recommends the installation of 4 — 63" HDPE siphon <br />pipes is shown in Figure 2. The alignment passes under Marsh Road to the north of Highway 101 and <br />201 71024Boyfront_ExhibitA <br />