FEMA’s map of current flood risk - its last preliminary map was released in 2015 - could show that thousands of more residents are in the flood zone, in many cases requiring them to pay for flood insurance. The federal government incorporates the data into two sets of maps currently in development by the Federal Emergency Management Agency and the city, one showing current and the other showing future flood risk for coastal parts of the five boroughs.īoth maps will have a significant impact when released. It is the backbone of scientific efforts to predict flooding and the effects of sea level rise caused by climate change. Today, that enormous data set, comprising more than a century and a half of measurements, serves a purpose never intended for it. In 1856, New York City began monitoring an important weather feature for the benefit of ships coming and going from the harbor: the height of the tide, and its change over the day and through the seasons.
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