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Wednesday, October 22, 2014

South Shore Rising
Stopping the ocean in a hurricane –– or not
Drain valves may not be the answer to halting backflow in a major storm
Scott Brinton/Herald
During Hurricane Sandy, a 10-foot tidal surge raced up the canal that leads to Cammans Pond in south Merrick, scattering floating docks, personal watercraft and boats and causing flooding on local streets. Storm-drain flapper valves would have done nothing to stop that surge, said Brian Schneider, deputy commissioner of the Nassau County Department of Public Works.

South Shore residents have returned to their normal lives in the months since Hurricane Sandy, but many people’s thoughts are starting to turn to the potential for another big storm. Is it possible to stop the floodwaters that inundated coastal neighborhoods? they wonder.

The answer, sadly, is no. There are ways to mitigate flooding –– to slow it down and hold it back for a time. But a foolproof way to stop the Atlantic Ocean, when it lashes out in its full fury, does not exist.

“There is not a fail-safe engineering solution” to stopping the ocean, said Brian Schneider, the assistant deputy commissioner of the Nassau County Department of Public Works, who is a hydrogeologist.

During Hurricane Sandy, floodwaters were forced through storm drains that let out into the bays, so, logically, many are wondering whether it is possible to install flapper valves on the storm drains’ outlet pipes that would keep water from the bays from flooding into the drains and onto local streets.

Such flapper valves exist, said Schneider, whose south Merrick home was flooded during Sandy. (He did not return to his water-soaked house for three months after the storm.) If there had been flapper valves on the more than 3,700 drain outlets across Nassau, they may have stopped backflow in the drainpipes. The trouble, however, was that floodwaters not only came through the drains, but also over land.

Flapper valves installed on the outlet pipes, Schneider said, might have impeded the flow of water from the streets into the bays. That, he said, might have caused even deeper street-level flooding.

“The water is going to go where it’s going to go,” he noted.

Schneider spoke of his hometown. In south Merrick, a 10-foot tidal surge raced over the finger-like canals that line the coast and pummeled the community during Sandy. Early in the morning of Oct. 29, before the storm unleashed its full fury, floodwaters had already breached the bulkhead at Cammans Pond, which connects to a canal, and floodwaters spilled into the street. That water needed somewhere to go, and after the high tide subsided, it filtered into the storm drains and back out into the bays, only to return later that evening.

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