Brainstorming Ways To Protect NYC From Real Storms

SternisheFan writes with this excerpt from NBC News: "The killer storm that hit the East Coast last month and left the nation's largest city with a crippled transit system, widespread power outages and severe flooding has resurfaced the debate about how best to protect a city like New York against rising storm surges. In a 2011 report called 'Vision 2020: New York City Comprehensive Waterfront Plan,' NYC's Department of City Planning listed restoring degraded natural waterfront areas, protecting wetlands and building seawalls as some of the strategies to increase the city's resilience to climate change and sea level rise. 'Hurricane Sandy is a wake-up call to all of us in this city and on Long Island,' Malcolm Bowman, professor of physical oceanography at State University of New York at Stony Brook, told NBC News' Richard Engel. 'That means designing and building storm-surge barriers like many cities in Europe already have.' Some of the projects showcased at Rising Currents include: Ways to make the surfaces of the city more absorptive (through porous sidewalks) and more able to deal with water, whether coming from the sea or sky; Parks and freshwater and saltwater wetlands in Lower Manhattan; Artificial islands or reefs (including ones made of recycled glass) to make the shoreline more absorptive and break the waves."

Comments

Just buy lots of Shamwow cloths.

[Anonymous Coward]

They can absorb like a barrel of water.

Not all that hard

[Animats]

Protecting Manhattan isn't that difficult. It's clear that the Con Ed station on 14th St needs to be raised; that's too important to be flooded out again. The subway system needs flood gates at several points. The London and Singapore systems have flood gates. The old Pennsylvania Railroad North Tunnels have flood gates, which Amtrak didn't maintain and were supposed to be fixed after 2001 as an anti-terrorism measure.

Some of the subway stations need extra protection, especially South Ferry. They need strong emergency flood barriers. Sandbags didn't work because a big piece of wood (about 1' x 1' by 15') from a construction site crashed through them and ended up in the booking hall. They need steel barriers that are raised out of the ground when necessary. Extra pumping capacity with backup power is indicated, too.

Those are no-brainers. After major hurricanes two years in a row, there's no question that those basic fixes are needed. Beyond that, it might be worthwhile to raise the ground level of the parks in the Battery Park area by a few meters. FDR Drive may need a flood wall south of the Brooklyn Bridge. Those are less urgent.

Barrier islands like Fire Island and the Rockaways, and the Jersey shore, are too low to fix. Just make sure everybody evacuates in time. (About 140 people refused to evacuate Fire Island, and getting them off after the island had been cut in two by the storm risked the lives of emergency personnel. The first group of rescuers had to be rescued.) Require Florida-level hurricane protection in house construction. Require paid-up private insurance for anyone who wants to build in the flood zone. Put in hurricane-resistant solar panel powered street lights (a commercially available product), so there's some light no matter what happens. A strict "no tall trees near power lines" policy may be necessary in the coastal zone.

New York State has a valuable resource - big rocks. Where roads and railroad tracks need to be protected against washouts, big rocks, too big for a storm to move (granite boulders the size of a SUV) should be used extensively.

(Forget the "balloon tunnel plug" idea. Something like that was used at the Penn Station yards, and it burst when hit by something.)

Re:my idea

[icebike]

So much of the infrastructure in NYC (and the rest of the East Coast) is so ancient that it is a wonder it functions from day to day in perfect weather, let alone a storm.

Where newer cities have buried virtually all electrical distribution, huge segments of it are hanging from polls, bridges, buildings, etc.
The push to get this stuff buried in waterproof pipe and tunnels has largely gone un-heeded, due to the sheer volume of the work to be done.

The local distribution systems are old, exposed, and vulnerable. Power lines run through trees, right-of-ways are unmaintained, and faults are fixed as fast as possible with little thought toward prevention.

Residential systems are deemed not critical. But when they short out, they trip other systems off line. When storms hit wide areas it is precisely these so called "non critical" residential feeders that cause the most problems. Large high-voltage lines are designed to handle severe weather, and their breaks or failures are easy to spot, quick to fix. But thousands of downed power lines in neighborhoods take excessive manpower, and a long time to fix.

I suspect that a cost-benefit analysis would not support a wholesale project to bury everything everywhere. After all, the humongous cost numbers of the lack of power are merely bean-counters adding up payroll numbers, speculating about lost business, and guessing.

Still, if every neighborhood that needed a major repair had its power system immediately trenched and buried the most vulnerable segments would be taken care of. Its a lot harder to trench in power in a populated place than it is when building a new subdivision, but its far from impossible. The convoys of mutual-aid power company vehicles rushing into the teeth of Sandy that I passes while I was driving west out of the path are testimony to the fact that the power companies do have a plan. But its the wrong plan. Its still focused on tacking the patchwork quilt back together AFTER the storm. Those trucks should each be pulling a Ditch Witch in fine weather, BEFORE of the storm.