The #ColoradoRiver: Strategies from lower and upper basin states to reduce water consumption — The Deseret News #COriver #aridification

“New plot using the nClimGrid data, which is a better source than PRISM for long-term trends. Of course, the combined reservoir contents increase from last year, but the increase is less than 2011 and looks puny compared to the ‘hole’ in the reservoirs. The blue Loess lines subtly change. Last year those lines ended pointing downwards. This year they end flat-ish. 2023 temps were still above the 20th century average, although close. Another interesting aspect is that the 20C Mean and 21C Mean lines on the individual plots really don’t change much. Finally, the 2023 Natural Flows are almost exactly equal to 2019. (17.678 maf vs 17.672 maf). For all the hoopla about how this was record-setting year, the fact is that this year was significantly less than 2011 (20.159 maf) and no different than 2019” — Brad Udall

Click the link to read the article on The Deseret News website (Emma Pitts). Here’s an excerpt:

July 9, 2024

In 2022, Lake Powell was at its lowest since it was originally filled in the 1960s. [Amy] Haas noted an ongoing concern that there is currently no mechanism to ensure the conserved water from the upper basin states is flowing down to Lake Powell and staying there.

The relationship between the upper and lower basin states is not always pleasant, but [Gene] Shawcroft noted that recently, agreements and understandings have been made between the entities…In their post-2026 operations proposal, the lower basin states said they would cut water use by 1.5 million acre-feet per year as long as Lake Powell and Lake Mead’s combined storage remains at a certain level. Shawcroft added that the question now is, at what point, do these cuts in water use begin?

“The upper division states feel very strongly that we need to improve our storage (and) that we need additional storage. And so our concept would be that we would have that one-and-a-half reduction occur at an elevation that was higher than what they would propose. Their position, or their thought process is, if there’s water in the system, we ought to put it to use,” he said.

Haas added, “The lower basin is proposing actions based on total system contents as they define it, which includes not only Lake Powell and Lake Mead but also the upstream initial units, right? So this would be Flaming Gorge, the Aspinall unit in Colorado and Navajo.”

Map credit: AGU

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