AG Today

Ag Today July 13, 2018

The Valley floor is sinking, and it’s crippling California’s ability to deliver water

BY DALE KASLER AND PHILLIP REESE, The Sacramento Bee

July 13, 2018 03:55 AM

TERRA BELLA
Completed during Harry Truman’s presidency, the Friant-Kern Canal has been a workhorse in California’s elaborate man-made water-delivery network. It’s a low-tech concrete marvel that operates purely on gravity, capable of efficiently piping billions of gallons of water to cities and farms on a 152-mile journey along the east side of the fertile San Joaquin Valley.

Until now.

The Friant-Kern has been crippled by a phenomenon known as subsidence. The canal is sinking as the Valley floor beneath it slowly caves in, brought down by years of groundwater extraction by the region’s farmers.

Along a 25-mile stretch of Tulare County rich with grapevines and pistachio trees, the canal has fallen so far — a dozen feet since it opened in 1951 — that it has lost more than half of its carrying capacity downstream from the choke point. Water simply can’t get through like it’s supposed to.

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