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FEMA Coastal Studies: What Will And Will NOT Be Included

FEMA maps the 1%-annual chance flood event for existing flood hazards.  Detailed engineering for the California Coastal Analysis and Mapping Projects (CCAMP) in Region IX will analyze the effects of storm surge, wave run-up, overtopping, and overland wave propagation for coastal communities.  Definitions and approaches for these terms can be found in Section D.4.5 of FEMA’s Final Draft Guidelines for Coastal Flood Hazard Analysis and Mapping for the Pacific Coast of the United States.

The coastal mapping efforts benefit from new coastal data, including detailed topographic and bathymetric data.  The studies will identify coastal high hazard areas within Special Flood Hazard Areas that are at the highest risk of damage caused by the combined effects of flooding and high wave action.  The engineering analysis will be used to determine revised Base Flood Elevations (BFEs) and update the Flood Insurance Study (FIS) reports and Flood Insurance Rate Maps (FIRMs) for the fifteen coastal counties that are part of the Open Pacific Coast Study, and the nine counties that are part of the San Francisco Bay Area Coastal Study. 

The CCAMP Open Pacific Coast and the San Francisco Bay Area Coastal studies will NOT include analysis of the following:

  • Tsunamis – Tsunami recurrence intervals are being investigated by FEMA in a pilot study for the City of Crescent City, Del Norte County.  FEMA is also collaborating with the California Geological Survey and the California Emergency Management Agency to assess hazards from tsunami impacts.  Neither of these efforts is tied to flood insurance requirements under the National Flood Insurance Program (NFIP) and the outcomes will not be included in the regulatory products, i.e. FIS reports or FIRMs.
  • Sea-Level Rise - FEMA does not map predictive long-term changes onto FIRMs, but rather depicts the existing conditions and current coastal flood hazards at the time of publication.  The current sea level rise that is measurable from 50-year hindcast data will be applied in the analysis for the CCAMP studies; however, future looking estimates and impacts of sea-level rise will not be part of the CCAMP studies.
  • Long-term Bluff Erosion As previously noted, FIRMs can only depict flood hazards based on existing conditions.  FEMA will analyze episodic erosion of dunes to determine revised BFEs, but the inland limit of flooding will generally extend only to base of a bluff whose elevation exceeds the BFE.  The OPC study will analyze how wave run-up interacts with bluffs, but will not include long-term shoreline change.   
  • Sand Transport – Sediment transport alongshore is not considered in FEMA studies.  The U.S. Army Corps of Engineers models longshore sediment transport using the same wave model that FEMA is using from Scripps Institution of Oceanography.

 Coastal Beat Story Archive

collapse Year : 2012 ‎(7)
<a href=''>Risk Map Local</a>
<a href=''>FEMA Leverages LiDAR</a>
<a href=''>FEMA’s CCAMP Studies and Our Coast, Our Future</a>
<a href=''>Region IX to Conduct First Flood Risk Review Meeting for CCAMP</a>
collapse Year : 2013 ‎(19)
<a href=''>FEMA Partners with Oceanweather and Scripps Institution of Oceanography to Bring Modeling Expertise to CCAMP OPC Study</a>
<a href=''>FEMA Region IX Holds Meetings for the California Coastal Analysis and Mapping Project / Open Pacific Coast Study</a>
<a href=''>Primary Frontal Dune Coastal High Hazard Area Mapping Requirements</a>
<a href=''>FEMA Holds South Bay Workshop to Kick-off Detailed Analysis in the South Bay Counties</a>
<a href=''>Translating Coastal Flood Hazard Modeling Results into Floodplain Mapping</a>
<a href=''>Terrain Modeling in FEMA’s California Coastal Flood Studies</a>
<a href=''>Join FEMA’s Community Rating System Program Using California’s Statewide Floodplain Management Activities</a>
<a href=''>Coastal Flood Processes Along the California Coast</a>
<a href=''>FEMA’s Annual Risk Awareness Survey: Findings from Previous Surveys and the Focus for the 2013 Survey</a>
collapse Year : 2014 ‎(9)
<a href=''>E386 Residential Coastal Construction</a>
<a href=''>Engaging Stakeholders to Help Communicate Impacts of BW-12</a>
<a href=''></a>
<a href=''>California Coastal Storm History Part Two – Ventura County</a>
<a href=''>Redelineation: What does it mean for me?</a>
collapse Year : 2015 ‎(2)
<a href=''>FEMA increases community access to draft floodplain mapping data </a>
collapse Year : 2016 ‎(6)
<a href=''></a>
1 - 40Next

 Other Stories

expand Arizona
Educating Maricopa County on the Power of Water,
Discovery Process, Thursday, February 23, 2012
expand California
Discovery Process, Thursday, March 1, 2012
NFIP Substantial Improvement and Substantial Damage Course, Wednesday, August 29, 2012
Santa Barbara County and Incorporated Areas Countywide Flood Insurance Rate Map,
Join FEMA’s Community Rating System Program Using California’s Statewide Floodplain Management Activities,
expand Coastal Studies
Discovery Process, Tuesday, January 10, 2012
Betty the Prepared Dog, Saturday, April 28, 2012
expand Hawaii
Tsunami: Learning from Experience in Hawaii,
Public Outreach Meeting for FEMA Flood Insurance Rate Map, Wednesday, August 8, 2012
expand Nevada
Clark County Flood Facts,
expand Region Wide
Be Prepared for a Flooding Event in your Community Today!,
Watershed University , Friday, June 1, 2012
Know Your Line: Be Flood Aware, Thursday, May 2, 2013
1 - 30 Next
  • The Summary of Map Actions (SOMA) Report: SOMAs Deciphered

    Many community officials and floodplain managers are called upon to review a Summary of Map Actions (SOMA) report, but how familiar are you with this document, and the process of developing it? Did you know that the ability to revise or amend effective Flood Insurance Rate Map (FIRM) panels is always available? Revisions and amendments to flood hazard information may be accomplished through FEMA’s Letter of Map Change (LOMC) process, without having to re-publish the FIRM. When a Flood Insurance Study (FIS) update or restudy requires a revised FIRM panel to be re-published, the existing LOMCs that applied to the old effective FIRM panels are superseded by the newly effective FIRM panels, and LOMCs that have remained valid are revalidated. As part of a map revision, FEMA publishes a Preliminary and Final SOMA report. The SOMA records a complete list of all previously issued LOMCs, and their valid or superseded status, for each community affected by revised FIRM panels. The SOMA assists community officials in maintaining the most up-to-date information on their community’s FIRMs. (Read more…)

  • Flood Insurance Rate Maps and Flood Insurance Studies: From Preliminary to Effective

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    From July 2015 through November 2015, FEMA distributed preliminary data to ten coastal counties as part of the Open Pacific Coast Study and three counties as part of the San Francisco Bay Area Coastal Study. For more information about what goes into a flood map, go to this infographic on FEMA’s website. (Read more…)

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