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HOW DO TIDAL CYCLES AFFECT COASTAL FLOODING?

The NJFloodMapper uses mean Higher High Water (MHHW) as a baseline for sea level. MHHW is the average of the higher high water height recorded each tidal day. Each month at the time of the new and full moon, especially strong tides (called spring tides) occur resulting in higher highs and lower low waters. A king tide is an especially high tide that occurs when the gravitational pull of the sun and moon reinforce one another. This extra-high tide happens twice a year at the times when the moon is closest to the earth. King tides can be 2-3 feet above normal MHHW and further exacerbate coastal flooding.

Cedar Run Dock Flooding: Before and During October 2011 king tide (source: Seslee Ganss)

Cedar Run Dock Road in Little Egg Harbor Bay flooding during the October 2011 king tide. Photo Credit: Leslee Ganss To learn more about king tides and see pictures go to http://bbp.ocean.edu/pages/357.asp .

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Funding for the developement of this website was provided by NOAA's Cooperative Institute for Coastal and Estuarine Environmental Technologies (CICEET), New Jersey Recovery Fund, New Jersey SeaGrant, New Jersey Department of Environmental Protection, and the New Jersey Agriculture Experiment Station.

 
 

Website composed by the Grant F. Walton Center for Remote Sensing and Spatial Analysis (CRSSA), Rutgers University, in partnership with the Jacques Cousteau National Estuarine Research Reserve (JCNERR), and in collaboration with the NOAA Office for Coastal Management (OCM), © 2017.