October 1 marked the beginning of the new Water Year in California. Water years here run from October 1 until September 30 of the next calendar year, and are named for the calendar year of the bulk of the water year (January-October). It is a good time to reflect on the last year and make largely futile predictions of precipitation for the coming 12 months.
The Bureau of Reclamation March 28, announced an increase in Central Valley Project 2023 water supply allocations. After below average precipitation in February, Reclamation announced a conservative initial water supply allocation for the CVP on Feb. 22. Additional atmospheric river systems have since boosted hydrological conditions and storage volumes, allowing for a more robust water supply allocation.
Since making initial allocations last month, Shasta Reservoir, the cornerstone of the Central Valley Project, has increased from 59% to 81%, and San Luis Reservoir, the largest reservoir south-of-Delta, from 64% to 97%. Record-breaking snowpack conditions currently exist in the Southern Sierra coupled with significant snowpack in the Central Sierra and Northern Sierra/Trinity.
Based on current hydrology and forecasting, Reclamation is announcing the following increases to CVP water supply allocations:
North-of-Delta Contractors
South-of-Delta Contractors
Friant Division Contractors
Friant Dam is currently being operated for flood control purposes; as long as these conditions exist contractors are able to take delivery of all available water from Friant Dam to the maximum extent of their respective contracts.
All other CVP water supply allocations remain the same as noted in the Feb. 22 announcement.
As the water year progresses, changes in hydrology, actions that impact operations, and opportunities to deliver additional water will influence future allocations. Reclamation will continue to monitor hydrology and may adjust basin-specific allocations if conditions warrant an update. Water supply updates and past year’s allocations are posted on Reclamation California-Great Basin Region’s website.
The U.S. national drought early-warning information system, called NIDIS, gave a rundown Thursday on when much of the Southwest will experience conditions that heighten the potential for wildfire.
Drought is one of the main drivers because less water means drier soils, drier plants and drier air, all conditions that fuel wildfire.
Segal’s Law: “Someone with one watch knows what time it is. Someone with two watches is never sure.” Time is certain, but its estimation and measurement are uncertain, yet we are not in total ignorance. Many water management and regulation decisions require an understanding of current and future hydrology.
The current ongoing two-year dry period in California, punctuated by the third-driest water year on record for the Central Sierra, is part of California’s overall arid fate so far in the 21st century, according to the state Department of Water Resources.
The Golden State’s hydrology now increasingly resembles conditions in the Colorado River Basin this century, where multiple, consecutive, drier-than-average years are mixed with an occasional wet year. California’s last wet water year was 2016-2017, the second-wettest on record.
As California’s seasons become warmer and drier, state officials are pondering whether the water rights permitting system needs revising to better reflect the reality of climate change’s effect on the timing and volume of the state’s water supply. A report for the State Water Resources Control Board recommends tailoring new water rights permits to California’s increasingly volatile hydrology. And it warns that the increasingly whiplash nature of California’s changing climate could require existing rights holders to curtail diversions more often and in more watersheds — or open opportunities to grab more water in climate-induced floods.
Valley farmers had low expectations heading into the spring. Federal water authorities likely met them, to say the least.
Tuesday, the U.S. Bureau of Reclamation announced its first water allocations for farmers and water users along the Central Valley Project.
Light snowpack is, once again, the culprit, Federal officials said.
“Although we had a couple of precipitation-packed storms in January and early February, we are still well below normal for precipitation and snowfall this year,” said Bureau region director Ernest Conant. “We will monitor the hydrology as the water year progresses and continue to look for opportunities for operational flexibility.”
Yes, California will have another multi-year drought. California has immense hydrologic variability, with more droughts and floods per average year than any other part of the country. California’s water users, managers, and regulators should always be prepared for droughts (and floods). Eventually, California will have a multi-year drought worse than any we have ever seen.
Historic wildfires raging from California to Colorado are weakening watersheds and setting the stage for deadly mudslides and flooding and, in some places, threatening to poison critical water supplies.
Arizona, Nevada and Mexico will again receive less water from the Colorado River next year under a set of agreements intended to help boost the level of Lake Mead, which now stands at just 40% of its full capacity.
The federal Bureau of Reclamation released projections on Friday showing that Lake Mead, the nation’s largest reservoir, will be at levels next year that continue to trigger moderate cutbacks in the two U.S. states and Mexico.
The Water News Network is San Diego County’s source for water news and information.
