Storm Surge Overview:Demographic Effects

&Spatial Analysis

Katie KeiperGeorge Murray

What’s Inside?

• Anatomy of the Surge

• SLOSH, MOMs, and MEOWs

• Spatial Analysis

• Local Impact/ Demographics

Storm Surge vs. Storm Tide

• Storm surge – abnormal rise of water generated by a storm, over and above the predicted astronomical tides• Storm tide – water level rise due to the combination of storm surge

and the astronomical tide

Factors Impacting Surge

SLOSH, MOMs and MEOWs

Katrina2005Cat. 4

Hugo1989Cat. 5

M

1) St. Mary’s River2) Amelia River3) Lofton Creek4) Nassau River5) Trout River, Broward Creek,

Dunn’s Creek6) Arlington River7) Ortega River8) Doctor’s Inlet9) Julington Creek10)Black Creek11)Pablo Creek12)Guana River

Local Impact

• Dora 1964

Local Impact

• Floyd 1999

Katrina 2005

Demographic Info• Nassau County• ~ 60,000 residents displaced• ~ 23,000 homes flooded/ destroyed• Appx. $1.1b USD

• Duval County• ~ 643,000 residents displaced• ~ 283,000 homes flooded/destroyed• Appx. $13b USD

Hurricane Surge LevelsBy CategoryF

0 10 205 Miles