Peripheral tunnels won't address subsidence threat to Central Valley
By Dan Bacher | November 24, 2013 | A U.S. Geological Survey report released on Thursday revealed that land subsidence caused by ov...
https://www.elkgrovenews.net/2013/11/peripheral-tunnels-wont-address.html
By Dan Bacher | November 24, 2013 |
A
U.S. Geological Survey report released on Thursday revealed that land
subsidence caused by over drafting of ground water supplies in the San
Joaquin Valley has resulted in a threat to water delivery systems,
including the Delta Mendota-Canal and the California Aqueduct.
Proponents
of the Bay Delta Conservation Plan (BDCP) to build the peripheral
tunnels used the report's release as yet another opportunity to promote
the $54.1 billion project as the "solution" to California's water
problems, while tunnel opponents said the tunnels will do nothing to
address the land subsidence threat.
The
report, "Land Subsidence along the Delta-Mendota Canal in the Northern
Part of the San Joaquin Valley, California, 2003–10," by Michelle Sneed,
Justin Brandt, and Mike Solt, reveals how extensive groundwater pumping
from San Joaquin Valley aquifers is increasing the rate of land
subsidence, or sinking.
"This
large-scale and rapid subsidence has the potential to cause serious
damage to the water delivery infrastructure that brings water from the
north of the valley to the south where it helps feed thirsty cropland
and cities," according to the USGS. "The subsidence is occurring in such
a way that there may be significant operational and structural
challenges that need to be overcome to ensure reliable water delivery."
The
report concentrates on subsidence in an original study area along the
Delta-Mendota Canal in the northern San Joaquin Valley, but also
includes data from a subsequently discovered and much larger subsidence
area that touches the canal on the southwest.
"This
subsidence is reducing the capacity of the Delta-Mendota Canal, the
California Aqueduct, and other canals that transport floodwater and
deliver water to agriculture, cities, industry and wildlife refuges,"
the USGS stated.
"The
USGS report was commissioned by the U.S. Bureau of Reclamation to learn
more about the challenges we face due to subsidence. It will help us
take additional proactive measures to ensure efficient delivery of water
to the San Joaquin Valley," said David Murillo, Mid-Pacific regional
director of the Bureau of Reclamation.
For the complete report, go to: http://pubs.usgs.gov/sir/2013/5142/
Phil
Isenberg, Chair of the Delta Stewardship Council, who also served as
the Chair of the Delta Vision Blue Ribbon Task Force and the Marine Life
Protection Act (MLPA) Initiative Blue Ribbon Task Force to create
alleged "marine protected areas" on the Central Coast, was the first to
respond to the report's release in a statement.
Isenberg
employed the report to promote the California Water Action Plan and the
Delta Stewardship Council’s "Delta Plan," both of which strongly
support the Bay Delta Conservation Plan to build the twin tunnels. There
are currently seven lawsuits by water contractors, environmentalists,
Indian Tribes and fishing groups against the severely-flawed "Delta
Plan" proceeding through the courts.
“This
report reinforces the urgency of understanding and better managing
California’s groundwater basins," said Isenberg. "The amount and
widespread nature of the subsidence found by the USGS is truly alarming
and shows that cutbacks in surface water deliveries because of drought
or environmental concerns cannot sustainably be replaced or exceeded by
continual groundwater extractions."
"The report also underscores the urgency of actions and recommendations included in the draft California Water Action Plan and the Delta Stewardship Council’s recently adopted Delta Plan," said Isenberg.
Restore
the Delta (RTD) responded to the release of the report by saying the
Brown Administration’s massive water export tunnels would "do nothing"
to address this threat to the Central Valley. Restore the Delta
Executive Director Barbara Barrigan-Parrilla said, “San Joaquin Valley’s
land subsidence is the real threat to California’s water delivery
system.”
She
noted that the report shows that the Westlands and Kern Water District
mega-growers are engaged in "unsustainable growing of permanent crops on
arid land, and that the governor’s Peripheral Tunnels don’t address
this root cause of the state’s water problem."
"The
San Joaquin Valley’s complicated system of moving water around depends
on maintaining water levels and flows in the Delta-Mendota Canal and in
irrigation canals," according to Barrigan-Parrilla. "But groundwater
overdraft in parts of the region is causing the land to subside and the
canals to sink. One dam and canal in western Madera County are sinking
six inches a year, so the dam won’t be high enough for gravity to push
water down the canal."
An
engineering geologist with the Department of Water Resources says that
two areas subsided up to a foot a year for the past four to five years. A
USGS hydrologist says the lining of the Delta Mendota Canal is actually
buckling in some places. One canal has lost 50% of its capacity due to
subsidence, according to Barrigan-Parrilla.
"Yet,
water rate payers are being asked to subsidize construction of the
Brown Administration’s peripheral tunnels so that big corporate
agribusinesses in the San Joaquin Valley can prop up its unsustainable
economic and environmental model," she explained.
“How
can California water ratepayers be expected to pay for the construction
of the Peripheral Tunnels when the state’s existing water delivery
infrastructure is breaking down?” said Barrigan-Parrilla. “Exporters
have spent millions of dollars creating a public campaign that they are
the victims, and that the Delta is the weak link, but these water takers
were never supposed to plant permanent crops."
Barrigan-Parrilla
concluded, "They’ve exhausted their own groundwater supply, and now
they are coming after the Delta and upstream rivers to support farms
that are not environmentally and economically sustainable. Sending them
water is like enabling a drug addict. Is the state’s entire water supply
to be sacrificed for almonds to export to China?"
The
construction of the $54.1 billion tunnels would hasten the extinction
of Sacramento River chinook salmon, Central Valley steelhead, Delta
smelt, longfin smelt and green sturgeon, as well as imperiling the
steelhead and salmon populations of the Trinity and Klamath rivers.
However,
the way the state and federal governments are managing Delta water,
many of these fish could become extinct before construction of the
tunnels ever begins. The 2013 Fall Mid Water Trawl (FMWT) abundance
indices recently released by the California Department of Fish and
Wildlife reveal that populations of Delta fish are only a small fraction
of their historical abundance before Delta water exports began.
The
indices for Delta smelt (7), striped bass (23), threadfin shad (70),
and American shad (135) were the second, second, third and second
lowest, respectively, in the 46 years of the survey. The index for
longfin smelt (36) was comparable to the very low indices of recent
years.
Delta
smelt, striped bass, longfin smelt, American shad and threadfin shad
populations in 2013 have plummeted 98.9, 99.6, 99.7, 89.1, 98.1 percent,
respectively, from the average of the initial six years of the survey
(1967-1972), according to Bill Jennings, Executive Director of the
California Sportfishing Protection Alliance (CSPA) and a board member of
the California Water Impact Network (C-WIN) and Restore the Delta. The
Sacramento splittail index was not released, but the 2012
September-October index was zero.
Massive
water exports to corporate agribusiness interests on the west side of
the San Joaquin Valley, combined with increases in toxic chemicals and
invasive species, have resulted in these fish population collapses,
according to state and federal scientists.
Yet
Brown is not only promoting the construction of the twin tunnels, but
on September 20 signed legislation, Senate Bill 4, giving the green
light to the expansion of fracking in California. This will only result
in increasing pollution of already contaminated ground water and surface
water resources with the toxic brew of fracking chemicals that oil
companies refuse to disclose.
For more information, go to: http://www.restorethedelta.org
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