The Colorado River system supplies water to tens of millions of people
and millions of acres of farmland, and has never experienced a delivery
shortage. But if human-caused climate change continues to make the region
drier, scheduled deliveries will be missed 60-90 percent of the time by
the middle of this century, according to a pair of climate researchers at
Scripps Institution of Oceanography, UC San Diego.
"All water-use planning is based on the idea that the next 100 years
will be like the last 100," said Scripps research marine physicist Tim
Barnett, a co-author of the report. "We considered the question: Can the
river deliver water at the levels currently scheduled if the climate
changes as we expect it to. The answer is no."
Even under conservative climate change scenarios, Barnett and Scripps
climate researcher David Pierce found that reductions in the runoff that
feeds the Colorado River mean that it could short the Southwest of a
half-billion cubic meters (400,000 acre feet) of water per year 40 percent
of the time by 2025. (An acre foot of water is typically considered
adequate to meet the annual water needs of two households.) By the later
part of this century, those numbers double.
The paper, "Sustainable water deliveries from the Colorado River in a
changing climate," appears in the April 20 edition of the journal
Proceedings of the National Academy of Sciences.
The analysis follows a 2008 study in which Barnett and Pierce found
that Lake Mead, the reservoir on the Colorado River created by Hoover Dam,
stood a 50-percent chance of going dry in the next 20 years if the climate
changed and no effort was made to preserve a minimum amount of water in
the reservoir. The new study assumes instead that enough water would be
retained in the reservoir to supply the city of Las Vegas, and examines
what delivery cuts would be required to maintain that level.
"People have talked for at least 30 years about the Colorado being
oversubscribed but no one ever put a date on it or an amount. That's what
we've done," said Barnett. "Without numbers like this, it's pretty hard
for resource managers to know what to do."
Barnett and Pierce also point out that lakes Mead and Powell were built
during and calibrated to the 20th century, which was one of the wettest in
the last 1,200 years. Tree ring records show that typical Colorado River
flows are substantially lower, yet 20th Century values are used in most
long-term planning of the River. If the Colorado River flow reverts to its
long-term average indicated by the tree rings, then currently scheduled
water deliveries are even less sustainable.
Barnett and Pierce show that the biggest effects of human-induced
climate change will probably be seen during dry, low-delivery years. In
most years, delivery shortfalls will be small enough to be manageable
through conservation and water transfers, they estimate. But during dry
years there is an increasing chance of substantial shortages.
"Fortunately, we can avoid such big shortfalls if the river's users
agree on a way to reduce their average water use," said Pierce. "If we
could do that, the system could stay sustainable further into the future
than we estimate currently, even if the climate changes."
SOURCE: Scripps Institution of Oceanography