Navigate Up
Sign In
User Login

IndividualStory

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='http://www.r9map.org/Pages/EbulletinStory.aspx?storyID=8'>Risk Map Local</a>
<a href='http://www.r9map.org/Pages/EbulletinStory.aspx?storyID=6'>FEMA Leverages LiDAR</a>
<a href='http://www.r9map.org/Pages/EbulletinStory.aspx?storyID=14'>FEMA’s CCAMP Studies and Our Coast, Our Future</a>
<a href='http://www.r9map.org/Pages/EbulletinStory.aspx?storyID=18'>Region IX to Conduct First Flood Risk Review Meeting for CCAMP</a>
collapse Year : 2013 ‎(19)
<a href='http://www.r9map.org/Pages/EbulletinStory.aspx?storyID=27'>FEMA Partners with Oceanweather and Scripps Institution of Oceanography to Bring Modeling Expertise to CCAMP OPC Study</a>
<a href='http://www.r9map.org/Pages/EbulletinStory.aspx?storyID=29'>FEMA Region IX Holds Meetings for the California Coastal Analysis and Mapping Project / Open Pacific Coast Study</a>
<a href='http://www.r9map.org/Pages/EbulletinStory.aspx?storyID=33'>Primary Frontal Dune Coastal High Hazard Area Mapping Requirements</a>
<a href='http://www.r9map.org/Pages/EbulletinStory.aspx?storyID=47'>FEMA Holds South Bay Workshop to Kick-off Detailed Analysis in the South Bay Counties</a>
<a href='http://www.r9map.org/Pages/EbulletinStory.aspx?storyID=50'>Translating Coastal Flood Hazard Modeling Results into Floodplain Mapping</a>
<a href='http://www.r9map.org/Pages/EbulletinStory.aspx?storyID=60'>Terrain Modeling in FEMA’s California Coastal Flood Studies</a>
<a href='http://www.r9map.org/Pages/EbulletinStory.aspx?storyID=62'>Join FEMA’s Community Rating System Program Using California’s Statewide Floodplain Management Activities</a>
<a href='http://www.r9map.org/Pages/EbulletinStory.aspx?storyID=54'>Coastal Flood Processes Along the California Coast</a>
<a href='http://www.r9map.org/Pages/EbulletinStory.aspx?storyID=56'>FEMA’s Annual Risk Awareness Survey: Findings from Previous Surveys and the Focus for the 2013 Survey</a>
collapse Year : 2014 ‎(9)
<a href='http://www.r9map.org/Pages/EbulletinStory.aspx?storyID=64'>E386 Residential Coastal Construction</a>
<a href='http://www.r9map.org/Pages/EbulletinStory.aspx?storyID=68'>Engaging Stakeholders to Help Communicate Impacts of BW-12</a>
<a href='http://www.r9map.org/Pages/EbulletinStory.aspx?storyID=70'></a>
<a href='http://www.r9map.org/Pages/EbulletinStory.aspx?storyID=74'>California Coastal Storm History Part Two – Ventura County</a>
<a href='http://www.r9map.org/Pages/EbulletinStory.aspx?storyID=76'>Redelineation: What does it mean for me?</a>
collapse Year : 2015 ‎(2)
<a href='http://www.r9map.org/Pages/EbulletinStory.aspx?storyID=78'>FEMA increases community access to draft floodplain mapping data </a>
collapse Year : 2016 ‎(6)
<a href='http://www.r9map.org/Pages/EbulletinStory.aspx?storyID=85'></a>
1 - 40Next
 

 Other Stories

 
expand 
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,
FEMA RELEASES PRELIMINARY FLOOD MAPS FOR SOLANO COUNTY , Thursday, January 31, 2013
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
  • Local Coastal Programs Help Communities Rise to the Occasion with Successful Mitigation

    For decades, the Local Coastal Programs (LCPs) that govern land use along the California coastline were focused on conservation and recreation, but not mitigation. That’s changing thanks to a state grant program that has made millions of dollars available for local communities to update their LCPs, with priority given to those that address sea-level rise, increasing erosion, and other effects of climate change.

    More...
  • Analyzing and Mapping Wave Overtopping in FEMA Coastal Flood Studies

    Wave overtopping is a common coastal hazard and source of flooding along the Pacific coast. During severe coastal storms, high waves and wave runup can overtop coastal barriers including bluffs, dunes, seawalls, revetments, and beach berms. When this happens, the overtopping water floods the area immediately behind the barrier. In some cases, the overtopping water has enough energy and force to damage structures, including homes. Therefore, analysis of wave overtopping is typically an important part of a detailed coastal flood study. It is also useful for communities to understand the process of wave overtopping so they can identify where it is included on their coastal flood maps. Learn more about some of the physical aspects of wave overtopping, how it was analyzed and why it was mapped in the California Coastal Analysis and Mapping Project (CCAMP) Open Pacific Coast (OPC) Study in this article.

    More...
View RSS feed



Powered by BakerAECOM