"Many people close their eyes to it and don't believe in [subsidence]." Subsidence is even worse in the Central Valley, where certain areas have sunk at a rate of 2 inches per month. California's ...

The old canal, built in the 1940s, was a disaster in slow motion, sinking with the valley floor since the time it was built. It was actually raised in the 70s, but the subsidence has continued.