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Climate: Groundwater another factor in coastal flooding

Coastal and island communities must consider groundwater as a potential multiplier when planning for rising sea levels. Image courtesy NASA.

New study sees groundwater as doubling the amount of flooding in some areas

By Summit Voice

FRISCO — Some coastal communities may face a double whammy when it comes to climate-related flooding during the next few decades. Along with rising sea levels, there’s also the overlooked threat of inundation from groundwater sources, according to a new research done by scientists with the University of Hawaii at Manoa.

The study, published in the journal Nature Climate Change, shows that the flooded area in urban Honolulu, Hawaii, including groundwater inundation, is more than twice the area of marine inundation alone — Specifically, a 1-meter rise in sea level would inundate 10 percent of a 1-kilometer wide urbanized area along the shoreline of southern Oahu; 58 percent of the total flooded area would be due to groundwater inundation. Continue reading

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