Last month, California's water resources control board sent notices to so-called "senior water rights holders" ordering them to stop drawing water from rivers and streams.
While that might not sound surprising four years into a drought, to the growers, irrigation districts and communities that have held the rights to that water for more than a century, it's a very big deal.
Some are continuing to pump water, and others have filed lawsuits that challenge the restrictions—welcome to the arcane world of water rights in the West.
Stanford law professor Buzz Thompson, Director of the Woods Institute for the Environment, joined Take Two to explain why California's water rights system built up the way it did and how it's impacting the state's response to the drought.
To hear the full interview, click the link above.