Miami Is Flooding

Elizabeth Kolbert, writing for The New Yorker on south Florida’s battle against rising sea levels:

According to the Intergovernmental Panel on Climate Change, sea levels could rise by more than three feet by the end of this century. The United States Army Corps of Engineers projects that they could rise by as much as five feet; the National Oceanic and Atmospheric Administration predicts up to six and a half feet. According to Wanless, all these projections are probably low. In his office, Wanless keeps a jar of meltwater he collected from the Greenland ice sheet. He likes to point out that there is plenty more where that came from.

“Many geologists, we’re looking at the possibility of a ten-to-thirty-foot range by the end of the century,” he told me.

We got back into the car. Driving with one hand, Wanless shot pictures out the window with the other. “Look at that,” he said. “Oh, my gosh!” We’d come to a neighborhood of multimillion-dollar homes where the water was creeping under the security gates and up the driveways. Porsches and Mercedeses sat flooded up to their chassis. […]

In Miami-Dade County, the average elevation is just six feet above sea level. The county’s highest point, aside from man-made structures, is only about twenty-five feet, and no one seems entirely sure where it is. (The humorist Dave Barry once set out to climb Miami-Dade’s tallest mountain, and ended up atop a local garbage dump nicknamed Mt. Trashmore.) Broward County, which includes Fort Lauderdale, is equally flat and low, and Monroe County, which includes the Florida Keys, is even more so.

But South Florida’s problems also run deeper. The whole region — indeed, most of the state — consists of limestone that was laid down over the millions of years Florida sat at the bottom of a shallow sea. The limestone is filled with holes, and the holes are, for the most part, filled with water.

It’s like trying to protect a sand castle against the tide, just with a longer time scale.

★ Saturday, 26 December 2015