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Sea levels rise will make high tides spill into communities far more often

A new study has suggested that daily flooding caused by high tides will occur in the District and Annapolis in less than thirty years due to the rise in sea levels as a result of global warming.

The study by the Union of Concerned Scientists says that by 2045 Washington and Maryland will experience about 400 floods per year, sometimes twice in a single day and some other cities and towns on the Atlantic coast will have tidal flooding almost as bad.

The study predicts that Miami, Atlantic City, Cape May, N.J., and Lewisetta and Windmill Point, both on the Chesapeake Bay in Virginia, can expect at least 240 days of flooding by 2045.

According to the study released Wednesday, the high-tide floods along the Atlantic coast in Baltimore, Norfolk, Philadelphia, Charleston, SC, Key West, Fla., and Sandy Hook, N.J., will happen less frequently, with about 180 events or more per year.

Tidal flooding is also called nuisance flooding and is not considered major when it is the result of the gravitational pull of the moon and sun. It's considered moderate when heavy rains increase its size, and major when storms supersize it. The rise in sea-level is considered an X-factor that could make each factor irreversibly worse.

Nuisance flooding is dangerous as it can overwhelm utility pumping stations and spill water onto roads and into homes.

The study, "Encroaching Tides: How sea level rise and tidal flooding threaten U.S. East Coast and Gulf Coast communities over the next 30 years," relied on data from the National Weather Service and the National Oceanic and Atmospheric Administration.

"We found places that are all flooding right now, and we think they have resonant stories," said Melanie Fitzpatrick, a climate scientist for the Union of Concerned Scientists and one of the study's three authors.