>That begs the next question: Then where does the water go?
They dump it into the Ocean.
"Despite California’s long drought, trillions of gallons of rainwater wastefully flowing into sea"
3-8-2019
https://www.foxnews.com/science/despite-californias-long-drought-trillions-of-gallons-of-rainwater-wastefully-flowing-into-sea
"Billions of gallons needlessly flushed out to sea"
3-4-2016
https://www.ocregister.com/2016/03/04/billions-of-gallons-needlessly-flushed-out-to-sea/
Not to mention the Oroville Dam thing.