There's a massive storm headed to New York, one that may flood the subway. What most people don't know is that we depend on just 700 fragile water pumps to keep the tunnels dry—some a century old. Updated
In fact, if someone powered down all these pumps tomorrow, the entire subway network would be inundated in just a few hours. To give you an idea of how complex and massive this system is, it pulls 13 million gallons of water out of the subway on any sunny day. No rain. Not even a single drop of water from the sky.
On a rainy day, it is absolute madness. To the point where the MTA—NYC's Metropolitan Transportation Authority—lives in permanent panic, fearing events like Nicole, the tropical storm system that is approaching the little town blue right now. "At some point, it would be too much to handle," said the head of the hydraulics team back in 2006, Peter Velasquez Jr., "you've got rain plus wind. It basically would shut down the system. You hope not. You pray that it doesn't."
This means that their hydraulic team—less than two hundred people—are now on full alert, ready to intervene and install additional portable water pumps in whatever stations are needed. This is not an easy task. When the water reaches a certain level it touches the third rail, which carries 625 volts. That makes the water extremely dangerous for these workers.
Back in the 1990s, a water main broke open, completely flooding the station at 125th Street and St. Nicholas Avenue. They had to send scuba divers to fix it, and use a diesel-powered train car to take the water out. It took an entire week to drain the station, extracting 2,700 gallons per minute. That's more than 27 million gallons.
But you don't need to fully inundate the tunnels to take the subway system out. The water flooding could take out entire lines if the pumps fail to keep the levels below their safety limits. In 2004, the subway system stopped after Hurricane Frances spewed two inches of rain per hour over the city. In 2007, things stopped again. Then Governor Eliot Spitzer declared that "the cause of the cascading outages across the mass transportation system this morning was the inability of our drainage system to handle what was, we believe, three inches of rain within a one-hour period."
Not much has changed since then. The MTA's drainage system still can only slurp 1.5 inches of rain per hour, which is much, much less than what Nicole is bringing: More than 7 inches of rain per hour, with sporadic winds up to 60mph. It kind of sounds like Velasquez's You hope not. You pray that it doesn't scenario.
Fortunately, New York City's anti-storm force field seems to be working well enough to deflect most of Nicole. The National Weather Service is keeping its flood watch for the metropolitan region thought the day, however, and the New York Times reports that there have been many problems in the city's subway and commuting trains today. Full service on lines 1, 2 and 3 was suspended from 5:30am to 7am because of flooding. Spokesman Kevin Ortiz says that now "everything is back with residual delays."
A reader gave us this interesting bit of info regarding the MTA's water pumps:
Some of the oldest pumps in the NYCTA system were bought second hand from the builders of the Panama Canal. I worked for the TA many years ago and even then the pumps were considered a serious problem.
The Panama Canal was finished in 1914.