From Bay Area News Group:
Emergency crews shut down a valve from a huge water main 3 1/2 hours after a pipe broke and sent a torrent of water and mud into the San Francisco neighborhood.
Crews shut off the valve about 1 p.m., but the 15 foot deep by 35-to -40 foot long groove is left behind where the pipe broke. Pieces of the torn pipe are visible in the crevice. Rocks, soil and mud were running down the road where the water flowed.
Police blocked off several streets in the area off Magnolia Avenue to redirect traffic after the break, which happened about 9:45 a.m. The burst quickly flooded streets and sent cars scrambling to get around the torrent of water pouring down.
It it is unclear what caused the break, which originated on Elm Court. Full article