New report: 3 of 4 upper #ColoradoRiver basin states overusing Colorado River water — Wild Earth Guardians #COriver #aridification #crwua2021

Here’s the release from Wild Earth Guardians (Jen Pelz):

New research released [December 13, 2021] argues that Utah, Colorado and New Mexico are overusing their rights to the Colorado River and have not reduced their use in the face of a declining water supply. The Report, A Future on Borrowed Time, shows that while Colorado River flows declined 20% over the last two decades, it is likely that water flows will decline more in the future.

If these water deficits continue, the Lower Basin states of Arizona, California, Nevada alongside Mexico have the right to force the Upper Basin states to cut their water use of Colorado River water. The report also demonstrates that Upper Basin water leaders proposing additional water diversions are jeopardizing the water supplies for both cities and farmers in their own states.

“There’s some antiquated leadership in the Upper Basin from proponents of new water diversions who are jeopardizing the water rights of farmers and cities who have been using Colorado River water for decades” said Zach Frankel, executive director of the Utah Rivers Council, which produced the report. “Water leaders need to either stop denying that the Colorado River has dropped 20%, or they need to be replaced with professionals who embrace science and want to protect existing water users, instead of endangering them by proposing new water diversions amidst a declining supply.”

“The water crisis in the Colorado River Basin gets more dire everyday,” said Jen Pelz, Wild Rivers Program Director at WildEarth Guardians. “This report makes plain that additional dams and diversions from the Colorado River are not only irresponsible, but put the entire basin and the communities that benefit from its water at risk of economic, environmental and cultural collapse. We need real and immediate commitments, especially from the Upper Basin states, to live within the river’s means.”

The report showcases the water deficits happening today among Utah, Colorado and New Mexico. These water deficits are based on the 21st Century average of water flows, which are 19% less than the 20th Century average on the Colorado River. Additional reductions in Colorado River water flows of 30% and 40% reductions in water volume demonstrate that serious water cuts may have to be made in the Upper Basin states, including all newly proposed water diversions.

“This report underscores what many officials are reluctant to say: The Upper Basin is already using more water than legally allowed” said Kyle Roerink, executive director of the Great Basin Water Network. “Any new dam or diversion for non-tribal entities would be a conflagration of the law and detrimental to the public interest. It’s time for the Upper Basin to follow the lead of the Lower Basin and begin doing the hard work to get the Colorado River System back in balance.”

As Upper Basin states have sought to increase their water use in the face of a declining water supply, the Lower Basin states and Mexico are cutting 613,000 acre-feet of water from their Colorado River water deliveries starting on January 1, 2022. Arizona, Nevada and California have also announced their intention to cut an additional 500,000 acre-feet on top of these water cuts to adapt to shrinking water supplies.

“The State of Baja California in Mexico depends heavily on Colorado River water and these water cuts mean less water for drinking, hygiene and other essential human needs” said Margarita Diaz, executive director of Proyecto Fronterizo de Educación Ambiental, the Tijuana Waterkeeper. “We need to create a plan to ensure our people have the essential water they need to survive our climate change crisis.”

Brad Udall: Here’s the latest version of my 4-Panel plot thru Water Year (Oct-Sep) of 2021 of the Colorado River big reservoirs, natural flows, precipitation, and temperature. Data (PRISM) goes back or 1906 (or 1935 for reservoirs.) This updates previous work with

“Upper Basin water leaders have refused to accept forty years of science demonstrating that climate change is shrinking the Colorado River” said John Weisheit, Conservation Director Living Rivers, Colorado River Waterkeeper. “It’s time to stop pretending that shortages in the Upper Basin are not coming, they are here now.”

“The lower basin (Arizona, California and Nevada) uses more than 1 million acre-feet/year more than it is supposed to use. The fish representative of the health of the Colorado River have already either disappeared (Colorado Pikeminnow) or are no longer reproducing in the wild and are maintained by hatcheries (Razorback Sucker),” says Center for Biological Diversity Co-founder Robin Silver. “And Arizona’s answer: continue growing at a non-sustainable rate, inadequate conservation efforts, and return to groundwater pumping which is also not sustainable.”

This research was part of a year-long research effort led by the Utah Rivers Council with input from water experts from across the American West. The report was funded in part by a grant from the Cultural Vision Fund.

To download the report, click here.

This map shows the Colorado River Basin and surrounding areas that use Colorado River Water, with four regions delineated, based on the degree to which flow is regulated and the channel physically manipulated. The dividing line for the upper and lower basin is Lee Ferry near Glen Canyon Dam.

From the exectutive summary:

This report quantifies the water shortages in the Upper Colorado River Basin so the public and its decision makers have some clarity about our shared future. The results are shocking. Before we explore these results, a few words on our methodology along- side a basic understanding of what climate change is doing to the Colorado River System water supply are needed.

In regards to methodology, we have estimated how large the Up- per Basin’s water shortage would be for different Colorado River flow scenarios but have not predicted the year in which these shortages will occur. Instead, we tie our quantification to reduced flow levels in the Colorado River which are happening as a func- tion of shrinking snowpacks from climate change.

These reduced flow levels are expected to continue as a function of climate change, meaning that any given shortage would occur
when the Colorado River reaches a projected level. Through this exercise, we were able to determine how much water each Up- per Basin state would be allowed to use if climate change contin- ues to lower the flows of the Colorado River in the future.

To properly understand how the Basin got to this water deficit, it is simply essential that stakeholders understand the impacts of climate change on the Colorado River System.

We recognize the words ‘climate change’ polarize some decision makers, many of whom govern our water supply and water pol- icies. However, we ask audiences who do not believe in climate change or do not believe mankind has caused climate change to suspend their disbelief long enough to learn about the observed impacts in the Colorado River Basin. Even if one doesn’t agree about the cause of the impacts, the impacts themselves are undeniable and must be addressed with intelligence.

The stakes of being wrong about what is happening to our water supply are very high, and having an open mind and hearing di- verse viewpoints is not only one of the responsibilities of elected and appointed officials, it’s an inspiring exercise in learning how our shared interests unite us more than they divide us.

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