text:  and he referred to the San Joaquin Valley as moving up and down, I guess, dozens of feet. I worked there with the Bureau of Reclamation for about three years, and there's two kinds of subsidence going on. A shallow subsidence caused by dry soils getting saturated, and they just collapse. And that causes up to 20 or 30 feet of subsidence, along with pulling out the deep water table from the farmers and ranchers