2024-01-02 13:58:18
The Parker Dam straddles the Arizona-California border and backs up the Colorado River to form Lake Havasu. The dam also generates electricity. ©Ted Wood Usage rights are granted for editorial and nonprofit purposes only. No commercial or re-sale rights are granted without permission of the photographer.
Click the link to read the article on The Los Angeles Times website (Ian James). Here’s an excerpt:
California’s Colorado River Board said Wednesday [December 13, 2023] that several water agencies and one tribal nation signed the first in a series of agreements that will conserve up to 1.6 million acre-feet of water. The agreements build on previous commitments by California, Arizona and Nevada to reduce water use by 3 million acre-feet over three years, cutting usage by regarding 14% across the Southwest. Much of the reductions are occurring in exchange for payments funded through the Inflation Reduction Act. The deals to reduce water use are aimed at boosting the levels of Lake Mead, the nation’s largest reservoir near Las Vegas, which now stands at 34% of capacity.
The latest agreements “represent another critical step in our collective efforts to address the water management challenges the Colorado River Basin faces due to drought and climate change,” said federal Reclamation Commissioner Camille Calimlim Touton. “Addressing the drought crisis requires an all-hands-on-deck approach, and close collaboration.”
[…]
A boat is shown on the Colorado River near Willow Beach Saturday, April 15, 2023. Willow Beach is located approximately 20 miles south of the Hoover Dam. Photo by Ronda Churchill/The Nevada Independent
Scientists have found that roughly half the decline in the river’s flow this century has been caused by rising temperatures, and that for each additional 1.8 degrees of warming, the river’s average flow is likely to decrease regarding 9%…Interior Department officials said the newly signed agreements secure conservation pledges of up to 643,000 acre-feet of water through 2025. The agreements, which were announced in Las Vegas, include $295 million in federal funds for conservation, water efficiency and protection of environmental resources. An acre-foot of water is enough to supply regarding three average homes for a year. The Coachella Valley Water District has agreed to save up to 105,000 acre-feet of water through 2025, roughly 10% of its supply from the river. The district’s proposal was approved earlier this year, and involves curtailing the use of Colorado River water for replenishing groundwater. In exchange, the federal government is paying $400 per acre-foot of water…
Coachella Valley. Graphic credit USGS.
In another agreement, the Quechan Tribe of the Fort Yuma Indian Reservation agreed to save up to 39,000 acre-feet of water in the next two years…Leaders of California’s Imperial Irrigation District, which delivers the single largest share of Colorado River water to farmland in the Imperial Valley, this month approved another agreement to conserve up to 100,000 acre-feet of water…That deal secured reductions in water use through an existing agricultural conservation program in the Imperial Valley and negotiations among several agencies. About half of the water had previously been earmarked to be sent to the San Diego County Water Authority under a water transfer agreement, but will instead remain in Lake Mead. The conserved water is enough to raise the reservoir’s level 1.5 feet…
The All American Canal diverts water from the Lower Colorado River to irrigate crops in California’s Imperial Valley and supply 9 cities. Graphic credit: USGS
Jack Schmidt, a professor who leads Utah State University’s Center for Colorado River Studies, recently analyzed reservoir levels and said in a blog post that “the rate of loss this year is much lower” than in all but one of the previous 10 years, “suggesting that current policies of reducing consumptive use may be working.”
Figure 4. Graph showing reservoir storage in the 21st century in three parts of the watershed, as well as the total storage. Note that conditions on 30 November 2023, at the far right hand side of the graph, are similar to conditions in early May 2021 and less than during most of the 21st century. Credit: Jack Schmidt
He noted that while this year’s ample snowpack in the Rocky Mountains brought an increase in reservoir levels, a portion of those gains have been used. He said the amount stored in the river’s reservoirs is now the same as it was in May 2021.
“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 regarding 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
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