<p>The Combined Hazard Present grid is created by building
the union of the 10% annual chance storm flood surface, the 1% annual chance
storm flood surface and the Category 5 Maximum of Maximums (MOM) Hurricane
flood surface into a single raster surface. Raster elements are assigned a
numeric value <span style='font-family:&quot;Cambria Math&quot;,serif'>(REV) </span><span style='mso-spacerun:yes'> </span>by applying a qualitative <i>“orness”</i> measure for any annual chance flood event. that yields the
maximum of the given data each raster element location.</p>

<p> </p>

<p><span style='font-size:11.0pt;line-height:107%;font-family:&quot;Calibri&quot;,sans-serif;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:Calibri;mso-fareast-theme-font:
minor-latin;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:&quot;Times New Roman&quot;;
mso-bidi-theme-font:minor-bidi;mso-ansi-language:EN-US;mso-fareast-language:
EN-US;mso-bidi-language:AR-SA'>
 
 
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 

 
</span></p>

<p>The 10% annual chance storm flood elevation is derived
through statistical analyses of tide gauges within the SACS study area,
utilizing a methodology developed by the USACE Engineering and Research
Development Center (<a href='http://hdl.handle.net/11681/7353' rel='nofollow ugc'><span style='mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'>http://hdl.handle.net/11681/7353</span></a><span style='mso-bidi-font-family:Calibri;mso-bidi-theme-font:minor-latin'> or </span><a href='https://www.jcronline.org/doi/abs/10.2112/JCOASTRES-D-15-00031.1' rel='nofollow ugc'><span style='mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri'>https://www.jcronline.org/doi/abs/10.2112/JCOASTRES-D-15-00031.1</span></a><span><span style='mso-ascii-font-family:Calibri;mso-hansi-font-family:
Calibri'>). </span></span>The 10% annual chance storm flood surface hazard is
derived by slicing the topographic DEM sourced from the NOAA Sea Level Rise
Viewer across the SACS Study Area: <a href='https://coast.noaa.gov/slrdata/' rel='nofollow ugc'><span style='mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri'>https://coast.noaa.gov/slrdata/</span></a><span><span style='mso-ascii-font-family:Calibri;mso-hansi-font-family:
Calibri'> </span></span>with the 10% annual chance storm flood elevation.<span style='mso-spacerun:yes'>  </span>Each raster element of the 10% annual chance
storm flood surface hazard is assigned a value of 0.1. The 1% annual chance
storm flood surface hazard<span style='mso-spacerun:yes'>  </span>is aggregated
from FEMA’s National Flood Hazard Layer (<a href='https://www.fema.gov/national-flood-hazard-layer-nfhl' rel='nofollow ugc'><span style='mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri'>https://www.fema.gov/national-flood-hazard-layer-nfhl</span></a>)
and assigned a value of 0.01. </p>

<p>The Category 5 Maximum of Maximums Hurricane flood hazard
are sourced from NOAA’s storm surge SLOSH inundation data (<a href='https://www.nhc.noaa.gov/nationalsurge/#data' rel='nofollow ugc'><span style='mso-ascii-font-family:
Calibri;mso-hansi-font-family:Calibri'>https://www.nhc.noaa.gov/nationalsurge/#data</span></a><span><span style='mso-ascii-font-family:Calibri;mso-hansi-font-family:
Calibri'>)</span></span>. These data were assigned a value of 0.001 to reflect
the low probability of a Category 5 hurricane event.</p>

<p>The SACS Combined Hazard Present grid resolution is 30
meters.</p>
None
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