subway be shut down for 21 days?

A group of researchers from Columbia University has predicted that it will take the New York subway three weeks to get back online.

Klaus Jacob, a geophysicist specializing in disaster management has produced a report that examined the effects on the transport infrastructure of the city after a 100-year storm.
Although there was an investigation into the likely effects of a Superstorm as sand, predicted a small hurricane or tropical storm would be closed for 21 days underground.

Limited bus service began again on Tuesday and is expected to increase throughout the week.
Trains stopped running in 19 hours Sunday as the MTA service preemptively closed for only the second time in its history.

The closure was an effort to ensure the subway system against the impending storm, but the spike came anyway.
Tunnels in the East River between Manhattan and Brooklyn flooded and dozens of stations across the city were flooded by the storm increased water levels of 13 feet.
Dr. Jacob and his researchers used a minor storm as a model for his report - which has only one percent chance of occurring in any given year.

A statement from the MTA, Sandy said Monday was the worst disaster in 108 years of history of the metro.
The report of Mr. Jacob believes a hurricane nearby, can result in billions of gallons of floodwater each of the 14 subway tunnels that run under the East River.

Each tunnel would take at least five days a pump dry.
21 days of the estimated time of the study include Dr. Jacob predicted that workers would metro system of the city back to the function of 90 percent.