The Hayes Creek is very wide and carries thousands of gallons of water each day under San Francisco’s Civic Center and Downtown neighborhoods. This water runs between buildings and threats the safety of infrastructures such as the Bart and the city hall, so it is mostly pumped and sent right into sewers. Most buildings in the area pump water from this watershed, including City Hall, the Opera House, Asian Art Museum, and the BART transit system.
Some buildings pump as much as 100,000 gallons a day. That amount could fill 30 or more street cleaning trucks.
The Powell Street BART Station has a sump room located inside the tunnel near the track platform, 75 feet below street ground surface. This pumps alone over 660 cups of water per minutes, which represent over 150,000 of gallons per day!
As commuters move through Powell and Civic Center BART, few are aware of the underground river constantly at odds with the BART stations. It is a costly process, but necessary to prevent flooding.