California

Just like the Colorado River it's likely the rebuilt Friant-Kern canal will never carry the water the canal did historically and that aquifers severely damaged by overdraft will never be recharged.

We broke this bank.

Rather than waiting until the bitter end when farms are abandoned and the topsoil blows away in the wind, we should be preparing for some sort of managed retreat, closing farms having the largest environmental footprints and restoring the land to something resembling a natural state.

In the long run water-intensive farming is only sustainable in places where water is plentiful and inexpensive. The southern end of California's Central Valley is no longer that place.