I recalled that happened before, at least five years ago when I was a student at City College of San Francisco and I would commute on the Muni metro from Montgomery. On a really bad rainy day, I was riding the subway and at Van Ness, I noticed with the gasp of my fellow passengers, a rush of water going down the stairwell. I soon learned later over the PA system that Muni declared the station "closed," but kept the trains running.
In yesterday's flood, Muni only had to shut-down for 20 minutes. After that period, trains operated, but avoided Van Ness station.
My big question to the city and SFMTA is, this looks like a repeat problem. What went wrong? I've never seen any other Muni metro station flood like how Van Ness did.