Subway anti-flood construction

Subway systems are built underground and are therefore prone to flooding. They should be designed to resist major flooding and channel water out of the system away from sensitive equipment.

Bulkheads
Subways should have sealable bulkheads throughput. The bulkheads should be able to not only close off the subway from the surface but also separate the stations from one another. This would prevent flooding of one station from damaging another.

Under Channel
A man-sized or larger tunnel should flow below the subway level. It would provide a place for water to drain and speed recovery after a flooding incident. Water in a subway would be designed to flow to the Under Channel.

Pumping Stations
Pumping Stations and generators should be located on the second floor level of the subway. The location would keep flooding from interfering with pump operation.

Electric systems
It should be possible to isolate a damaged station. Loss of one station shouldn't prevent operation of others.