AgdaPkt 2008-04-28 - Laserfiche WebLink

Browse Search

6.3A Page 8 I. Purpose of Manual The purpose of the City of Redwood City Levee Operations and Maintenance Manual is to document the procedures for monitoring, inspection, operation, and maintenance of the perimeter levee system protecting the City of Redwood City from potential coastal flooding. The integrity of the levee system must be maintained to prevent potential flooding from the Steinberger Slough and the Belmont Slough from high tides, storm surges, and wave action from San Francisco Bay, and runoff from high intensity precipitation falling within the perimeter levees. The manual serves as a guide for operating procedures before, during, and after a flood emergency, as well as for daily regularly scheduled maintenance. Operations and maintenance activities and responsible parties are identified in the manual for documentation and reference. The manual is intended to be reviewed and updated on a regular basis with the latest revision date provided on the lower right-hand corner. II. History The Redwood Shores development is located on the Redwood Shores Peninsula . along the west shore of the San Francisco Bay in the City of Redwood City, County of San Mateo. The peninsula occupies approximately 1,500 acres and is accessed by Marine Parkway and Redwood Shores Parkway from U.S. 101. The peninsula is bordered by Belmont Slough to the northwest, the San Francisco Bay to the north and northeast, and Steinberger Slough to the south and southeast. Reclamation ofthe Redwood Shores peninsula began in 1910 when pasture land was converted for residential and commercial development. Over the years the old dikes were upgraded into levees as the waterfront was developed. From 1960 to 2002, the City's Levee Improvement projects ensured that the levee systems in Redwood Shores were connected and contiguous. Levees ring the peninsula, since the ground elevations are below the higher tides. These levees surrounding the peninsula are maintained by the City of Redwood City through fee title ownership or easements. For easy reference, the series of levees are designated Levee Segments I through VIII. A map of the levee segments is included in Exhibit A. Most segments of the levee were improved in 1997, with the exception of segments III, VI, and VII. Clean imported soil and dredged bay mud material was placed along the levee segments resulting in a uniform levee elevation of 10 feet National Geodetic Vertical Datum (NGVD), with the exceptions of Levee Segment I, II, and VIII, which are 9.5 feet. The levee top width on most levee 1 April 2008