California could use a good rain, a lot of long, soft rains that gently soak into the soil and refill its aquifers. The aquifers have supported agriculture and industry, even through the drought, but they are running dry. Unfortunately, users have been pumping without knowing how much water was down there. Wells are now running dry. The ground is sinking as aquifers empty, and a few good rains won’t make much of a difference. The estimate is that it took millions of years to fill them, and that was without anyone trying to simultaneously empty them. Even after teh drought, California will continue to have water problems.