Qgallala Aquifer lies beneath mid-western states |
Longmont, Colo. Imagine you are a farmer in the center of the country, where it seldom rains enough.
Now imagine that a well driller came to your farm and told you that he could
bore a hole deep into the ground, and that forever after you could pump out as
much water as you needed to grow your crops. That is exactly what happened on
the Great Plains in the mid-20th century. The wondrous resource containing all
that water was the Ogallala Aquifer.
The Ogallala underlies portions of eight large states — 174,000 square
miles of crop and range land all the way from South Dakota to Texas. Over the
last several months, it became about as famous as a geologic formation can get.
With the nation’s environmentalists at their side, Nebraska landowners battled
ferociously against the Keystone XL pipeline, which would have carried oil
extracted from Canadian tar sands through the environmentally sensitive
Nebraska Sand Hills. If the pipeline leaked, they argued, chemicals and oil
would seep down into the aquifer, contaminating a precious resource responsible
for 27 percent of the nation’s irrigated
agriculture.
They won — for now. President Obama agreed last month to reconsider
the pipeline’s route. So is the Ogallala now safe? Not quite. Regardless of
whether the pipeline was a good or bad idea, it was never the real danger. The
true threat is posed by agriculture as it’s currently practiced on the Great
Plains by the farmers themselves, many of whom opposed the pipeline vehemently.
The aquifer is being wasted and polluted. Wasted, that is, on corn, a thirsty
crop that requires over 20 inches of irrigation water in parts of the Plains.
And polluted with pesticides and nitrogen fertilizers.
It’s not that I don’t empathize with the Nebraska farmers. I grew up
on a Kansas farm. Like them, we called our Ogallala water “precious” and
bragged that it was the best in the world. But the aquifer’s only natural
recharge comes from rain and snow. In our Kansas district, less than half an
inch of that reached the aquifer in a given year. We were allowed to pump out
over 30 times that amount.
When I expressed concern, my father assured me that the government
would step in to stop us someday. Until then, he liked to tease, “I got mine!”
But the government has not stepped in. Controls imposed by local water
districts — run by irrigators themselves — and by state legislators dependent
on the farm vote have been minimal at best.
As a result, in some areas of Kansas and Texas, farmers can no longer
pump enough to water their crops. If current withdrawal rates continue, usable
water in most areas will be gone by the end of this century.
The aquifer in the Nebraska Sand Hills gets more recharge than
elsewhere, because rain and snowmelt seep quickly through sand. Opponents of
the Keystone XL pipeline argued that this characteristic made that part of the
aquifer particularly susceptible to contamination. They were right. But
contaminants are already there. According to a report by the United States
Geological Survey in 2009, 90 percent of samples taken from shallow groundwater
in Nebraska portions of the Ogallala contained nitrate from fertilizers.
The Ogallala is a geologic formation, not an underground lake that can
be widely contaminated by a localized spill. Water fills the spaces between
sandstone, gravel, clay and other sediments, which slow the water’s lateral
travel. A pipeline leak would have been minor compared to the damage that
chemically dependent agriculture causes.
Chemicals trickle inexorably downward with each rainfall or
application of irrigation water, creating a situation that the Geological
Survey has referred to as “creeping normalcy.” Over the coming decades, it
warned, contaminants will continue to creep down into the aquifer, and more
wells will exceed federal safety levels.
Already, 14 percent of all Ogallala irrigation wells tested contained
one pesticide or more. Most common was Atrazine. This herbicide, used
ubiquitously in cornfields, is a known hormone disruptor and is suspected of,
among other things, retarding fetal development. Five percent of the irrigation
wells contained nitrate levels equal to or in excess of safety standards set by
the Environmental Protection Agency. Excess nitrate levels in drinking water
can impair the blood’s ability to deliver oxygen in infants, causing “blue baby
syndrome.”
Why haven’t viable environmental groups formed to protect the
Ogallala? Because corn contributes so much to the economy that its reign is
seldom questioned. Federal subsidy payments to corn growers and the federal
mandate to produce ethanol underwrite the waste and pollution.
These subsidies should end. When the farm bill comes up for
reauthorization next year, Congress should instead pay farmers to reduce their
dependence on irrigation and chemicals. The eastern Nebraska climate is moist
enough to grow corn without irrigation. That is how the University of Nebraska
football team came to be the Cornhuskers. And the more arid High Plains to the
west are known as the nation’s breadbasket because wheat, a drought-tolerant
crop, thrives there.
The Keystone XL pipeline posed a potential threat to a limited region.
But agricultural waste and pollution are damaging the entire Ogallala Aquifer
right now. In an era of growing population and advancing drought, we cannot
afford complacency in the face of “creeping normalcy.”
Julene Bair,
the author of “One Degree West: Reflections of a Plainsdaughter,” is at work on
a memoir.
No comments:
Post a Comment