revised noaa flood zone maps post hurricane sandy
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7/29/2019 Revised NOAA Flood Zone Maps Post Hurricane Sandy
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Luke P Fetten
Geography 176A
Forum Posting
Revised NOAA Flood Zone Maps Post Hurricane Sandy
On October 29, 2012, Hurricane Sandy made landfall as a Category 1
hurricane just north of Atlantic City, New Jersey after an interesting week of
unpredictability. The storm became the second costliest storm bringing over 68
billion dollars in damage to 24 states. In the hours leading up to landfall GIS analysts
crunched numbers and applied models to accurately depict flood zones as a result of
storm surges and rainfall. Several months after, these same GIS professionals are
working with FEMA, NOAA, and the New Jersey Department of Environmental
Protection to revise old flood maps to more accurately depict the true flood zones.
Immediately after the storm, Advisory Base Flood Evaluations (ABFEs) were
released to give the most up to date flood hazard data that was available for
communities and individuals to properly rebuild damaged properties. On June 17,
2013, preliminary work maps were released to show changes in the ABFEs with
more accurate data. These maps show in layers the old ABFE and the new
preliminary ABFE and what flood zone the polygon enclosed areas are apart of. Zone
V/VE is an area of high flood risk subject to inundation by the 1% annual-chance
flood event with additional hazards due to storm-induced velocity wave action, a 3
foot or higher breaking wave. Zone A/AE is an area of high flood risk subject to
inundation by the 1% annual-chance flood event determined by detailed methods.
Zone AO is an area of high flood risk subject to inundation by 1% annual-chance
shallow flooding where average depths are between one and three feet. Average
flood depths derived from detailed hydraulic analyses are shown in this zone.
Shaded Zone X is an area of moderate coastal flood risk outside the regulatory 1%annual chance flood up to the 0.2% annual chance flood level. Based on the new
preliminary ABFE maps many changes have been made. A few screenshots are
shown below of the Sea Bright Police Department and the flood zone maps for that
location before and after re-evaluation as well as a few photos of the damage there.
These maps will dictate how people are allowed to build in flood zone areas. Some
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7/29/2019 Revised NOAA Flood Zone Maps Post Hurricane Sandy
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areas have lost flood zone status are have a decreased risk much like the examples
below, but many places have a much higher risk associated with them.
New Preliminary ABFE Work Map from Region2Coast.com:
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Preliminary ABFE from FEMA ArcGIS:
Original ABFE from FEMA ArcGIS:
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Damage Post Sandy at Sea Bright:
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Sources:
http://www.region2coastal.com/coastal-mapping-basics
http://www.region2coastal.com/sandy/table
http://www.region2coastal.com/coastal-mapping-basicshttp://www.region2coastal.com/coastal-mapping-basicshttp://www.region2coastal.com/sandy/tablehttp://www.region2coastal.com/sandy/tablehttp://www.region2coastal.com/sandy/tablehttp://www.region2coastal.com/coastal-mapping-basics -
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http://fema.maps.arcgis.com/home/webmap/viewer.html?webmap=2f0a884bfb43
4d76af8c15c26541a545
http://www.state.nj.us/dep/gis/gisemerresp.html
http://gcn.com/Articles/2013/02/27/FEMA-emergency-data-available-real-
time.aspx?Page=1
http://www.nj.com/news/index.ssf/2013/06/new_flood_maps_shrink_riskiest_are
as_in_4_nj_counties_by_at_least_45_percent.html
http://fema.maps.arcgis.com/home/webmap/viewer.html?webmap=2f0a884bfb434d76af8c15c26541a545http://fema.maps.arcgis.com/home/webmap/viewer.html?webmap=2f0a884bfb434d76af8c15c26541a545http://fema.maps.arcgis.com/home/webmap/viewer.html?webmap=2f0a884bfb434d76af8c15c26541a545http://www.state.nj.us/dep/gis/gisemerresp.htmlhttp://www.state.nj.us/dep/gis/gisemerresp.htmlhttp://gcn.com/Articles/2013/02/27/FEMA-emergency-data-available-real-time.aspx?Page=1http://gcn.com/Articles/2013/02/27/FEMA-emergency-data-available-real-time.aspx?Page=1http://gcn.com/Articles/2013/02/27/FEMA-emergency-data-available-real-time.aspx?Page=1http://www.nj.com/news/index.ssf/2013/06/new_flood_maps_shrink_riskiest_areas_in_4_nj_counties_by_at_least_45_percent.htmlhttp://www.nj.com/news/index.ssf/2013/06/new_flood_maps_shrink_riskiest_areas_in_4_nj_counties_by_at_least_45_percent.htmlhttp://www.nj.com/news/index.ssf/2013/06/new_flood_maps_shrink_riskiest_areas_in_4_nj_counties_by_at_least_45_percent.htmlhttp://www.nj.com/news/index.ssf/2013/06/new_flood_maps_shrink_riskiest_areas_in_4_nj_counties_by_at_least_45_percent.htmlhttp://www.nj.com/news/index.ssf/2013/06/new_flood_maps_shrink_riskiest_areas_in_4_nj_counties_by_at_least_45_percent.htmlhttp://gcn.com/Articles/2013/02/27/FEMA-emergency-data-available-real-time.aspx?Page=1http://gcn.com/Articles/2013/02/27/FEMA-emergency-data-available-real-time.aspx?Page=1http://www.state.nj.us/dep/gis/gisemerresp.htmlhttp://fema.maps.arcgis.com/home/webmap/viewer.html?webmap=2f0a884bfb434d76af8c15c26541a545http://fema.maps.arcgis.com/home/webmap/viewer.html?webmap=2f0a884bfb434d76af8c15c26541a545
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