AgdaPkt 2015-01-12 Joint SA Amended

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San N9.A. - Page 15 Study and Mapping Timeline Letter of Final Flood Risk Review Determination Maps Effective * Coastal Analysis Floodplain Prelim. Prelim. Appeal Adoption Period Mapping Production Issuance Period Coastal Flood Zones Regional - scale storm surge and wave The resulting coastal flood hazard models of San Francisco Bay were elevations determine updated Within the coastal SFHA, there are used to produce time - series output 1- percent annual chance flood zones two primary zones: Zone VE and of water levels, open ocean swells, which will be used to produce updated Zone AE. Zone VE, also known as and wind - driven waves at over eight FIRM panels in the form of a Physical the Coastal High Hazard Area, has thousand points along the complex Map Revision and an updated FIS a wave component that is greater San Francisco Bay shoreline. The San report for San Mateo County. than three feet in height. Coastal Mateo County shoreline was separated Zone AE has a wave component of into representative reaches that Next Steps, Stay Informed 0 -3 feet in height. account for variations in topography, and Engaged! nearshore bathymetry, shoreline BFEs will vary in each zone. type, development density, land use, es in flood zone and BFEs After FEMA's onshore coastal flood Changes and incident wave conditions. 1 -D hazard analysis, a Flood Risk Review can have a significant impact on transect -based models oriented building requirements and flood meeting will be conducted with San perpendicular to the shoreline were Mateo County community officials insurance costs. Because waves developed for each shoreline reach. can diminish in size in a short to inform them of proposed SFHA distance, particularly where the Using the regional scale model ouput and BFE changes before the revised ground is steep, BFEs can differ as the boundary conditions, the 1-D FIRM panels are developed. The goal dramatically in adjacent areas of models are used to calculate the of the Flood Risk Review meeting coastal zones. location and height of waves as the is to enhance the communities' coastal floodwaters move inland understanding of the available flood Community Rating System over normally dry land and vegetated datasets, to discuss study methods marshes. Depending on the shoreline and results, and to provide information Communities that participate in the characteristics, the 1 -D models will on increasing risk awareness and National Flood Insurance Program include an analysis of wave runup, stimulating mitigation actions that can Community Rating System (CRS) can wave overtopping, and overland reduce risk. increase flood risk awareness and wave propagation. The result is the preparedness in their communities, identification of coastal flood hazards and also save their residents money associated with a flood event having CCAMP on flood insurance. The Cities of Am a 1-percent annual exceedance e Burlingame, East Palo Alto, and San probability that combines both elevated e," Carlos, are saving their residents coastal water levels and waves. between 5 to 15 percent on their flood insurance premiums. There is potential to save your residents up to To stay up-to-date with the San Francisco Bay Area Coastal Study, 45 percent on their flood insurance _ , premiums. More information on -Jr' # = -- - _ _ and the companion Open Pacific CRS can be found at www.fema.gov/ - . r - _ - Coast Study, sign up for the quarterly national - flood- insurance - program - .- Coastal Beat, that will community- rating- system. include schedule updates, technical - - - — articles and facts of interest, and relevant information as the study progresses. Visit www.r9coastal.org for `„ - additional coastal study information.