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    San Joaquin Valley

    Going Down: NASA Warns That California is Sinking Into the Ground

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    NASA satellite observations have revealed that large swathes of land in northern California are sinking at an alarming rate.

    Having analyzed and compared multiple satellite and airborne interferometric synthetic aperture radar images of Earth’s surface, scientists at NASA’s Jet Propulsion Laboratory (JPL) have determined that several sections of the ground in California’s San Joaquin Valley are sinking.

    According to the study's authors, this subsidence process has been caused by excessive groundwater pumping, which has continued unabated since 1920s, with some areas sinking by up to 28 feet over the course of the past century.

    It should be noted that California suffers from a historic drought that started several years ago and which further exacerbates the problem, as local farmers depend on excessive groundwater pumping to sustain their crops during droughts.

    Total subsidence in California’s San Joaquin Valley
    © Photo: European Space Agency/NASA-JPL/Caltech/Google Earth
    Total subsidence in California’s San Joaquin Valley

    The scientists have identified two areas, the so called subsidence bowls, in the vicinity of the towns of Chowchilla and Corcoran respectively, each of them covering hundreds of square miles and growing wider and deeper. During the past year, the ground at the Corcoran ‘bowl’ sunk by almost two feet while a subsidence of about 16 inches was detected near Chowchilla.

    Also, a 7-mile area near Tranquility in Fresno County has sunk by 20 inches during the same period of time, and small amounts of land subsidence were also detected in the Sacramento Valley and the Sierra Valley.

    The JPL scientists noted that subsidence in some areas of the San Joaquin Valley has slowed down during the winter of 2015-2016, when rainfall matched crop water needs.

    "While we can see the effect that rain has on subsidence, we know that we've run a groundwater deficit for some time, so it'll take a long time to refill those reservoirs," JPL report co-author Tom Farr said.

    Furthermore, land subsidence is having an adverse effect on water supply routes in California, like the California Aqueduct and Eastside Bypass, as water project operators must reduce flows in the sections that have sunk in order to avoid overtopping the banks.

    "The rates of San Joaquin Valley subsidence documented since 2014 by NASA are troubling and unsustainable. Subsidence has long plagued certain regions of California. But the current rates jeopardize infrastructure serving millions of people. Groundwater pumping now puts at risk the very system that brings water to the San Joaquin Valley. The situation is untenable," California Department of Water Resources Director William Coyle said.

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    Tags:
    satellite, groundwater, sinking, land, NASA's Jet Propulsion Laboratory, California, United States
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    • Jeffrey Spinner
      Whatever it takes to get rid of the Chinese state owned, Hollywood movie/tv industry. Maybe the Fukushima radiation is taking too long...either way, Cali is DOA.
    • siberianhusky
      Is this why so many people are gravitating too California?
      Time for Trump to give it back to Mexico and let them deal the problem and less fence to build. :-)
    • avatar
      sakissel
      "Pejig Mikiziw

      California, as with just about everyone else, still practices the irrigation of crops during daylight- the worst time for the root systems of the plants, during which time the evaporation rate is astounding. Sane agriculturists have been lobbying for night-time irrigation for years, to no avail! We are a nation of fools".

      Very interesting comment ( copied from Facebook ) wouldn't you agree?
    • avatar
      knollburkhard
      should a Little faster disapearing this dimwited lonely bin. Creatures who need weapons are not humenbeing.
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