Not only dry periods, CA periodically has extreme wet periods that come once every century or so. In the 1860s the Central Valley turned into a giant lake, 300

Not only dry periods, CA periodically has extreme wet periods that come once every century or so. In the 1860s the Central Valley turned into a giant lake, 300 miles long. Sacramento was completely under water. To this day the original Sacramento is 15 feet underground, the new built on top of the old after the great flood.