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.
2023 Central Valley Project supply allocations increased
Based on current hydrology and forecasting, Reclamation is announcing the following increases to CVP water supply allocations:
North-of-Delta Contractors
Irrigation water service and repayment contractors north-of-Delta are increased to 80% from 35% of their contract total.
Municipal and industrial water service and repayment contractors north-of-Delta are increased to 100% from 75% of their historic use.
South-of-Delta Contractors
Irrigation water service and repayment contractors south-of-Delta are increased to 80% from 35% of their contract total.
M&I water service and repayment contractors south-of-Delta are increased to 100% from 75% of their historical use.
Friant Division Contractors
Friant Division contractors’ water supply is delivered from Millerton Reservoir on the upper San Joaquin River and categorized by Class 1 and Class 2. The first 800,000 acre-feet of available water supply is considered Class 1; Class 2 is considered the next amount of available water supply up to 1.4 million acre-feet. Class 1 remains at 100% and Class 2 was previously increased from 20% to 70% on March 7.
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.
https://www.waternewsnetwork.com/wp-content/uploads/2023/03/PJH_Delta-Mendota-0129-Bureau-of-Reclamation-Primary.jpg450845Mike Leehttps://www.waternewsnetwork.com/wp-content/uploads/2018/02/water-news-network.pngMike Lee2023-03-28 12:16:032023-03-28 12:16:03Reclamation Increases Central Valley Project 2023 Water Supply Allocations
Snowpack reached a new high after Thursday night’s storms. The snow water equivalent in Utah, or the amount of water the snow will release when its melts, sits at 26 inches as of Friday morning. That ties with the previous known record of 26 inches set on April 13, 1983, according to Utah Snow Survey data. And with the snow still falling, Friday is likely a new snowpack record.
NOAA’s U.S. Spring Outlook indicates the abnormally wet winter will further improve drought across much of the western U.S. as the snowpack melts in the coming months. Winter precipitation, combined with recent storms, wiped out exceptional and extreme drought in California for the first time since 2020, and is expected to further improve drought conditions this spring.
Significant flooding in the western U.S., especially in California, followed another series of strong Pacific storms that battered the region in March, and piled on to an already historic snowpack.
https://www.waternewsnetwork.com/wp-content/uploads/2018/02/water-news-network.png00Mike Leehttps://www.waternewsnetwork.com/wp-content/uploads/2018/02/water-news-network.pngMike Lee2023-03-20 10:55:372023-03-20 11:00:13NOAA Spring Outlook: California Drought Cut by Half with More Relief to Come
NOAA’s U.S. Spring Outlook indicates the abnormally wet winter will further improve drought across much of the western U.S. as the snowpack melts in the coming months. Winter precipitation, combined with recent storms, wiped out exceptional and extreme drought in California for the first time since 2020, and is expected to further improve drought conditions this spring.
Significant flooding in the western U.S., especially in California, followed another series of strong Pacific storms that battered the region in March, and piled on to an already historic snowpack.
NOAA’s U.S. Spring Outlook highlights temperature, precipitation, drought and flood predictions for April through June to help the nation prepare for potential weather and climate threats to lives and livelihoods.
Climate change – wet and dry extremes
“Climate change is driving both wet and dry extremes, as illustrated by NOAA’s observations and data that inform this seasonal outlook,” said NOAA Administrator Rick Spinrad, Ph.D. “Under the Bipartisan Infrastructure Law and Inflation Reduction Act, and in support of the Biden Administration’s priority to tackle the climate crisis, NOAA will invest significant resources to build a Climate-Ready Nation that gives communities tailored information about changing conditions so that residents and economies are protected.”
March Snow Drought Update
While the Snow Piles Up Across California and the Great Basin, Snow Drought Concerns Have Popped Up in Parts of the Northwest and Southern Colorado
Spring Outlook for drought, temperature and precipitation
On March 9, NOAA forecasters declared La Niña over. The El Niño-Southern Oscillation (ENSO) is a climate pattern, based on changes in rainfall and sea surface temperatures across the equatorial Pacific Ocean, that influences temperature and precipitation around the world. La Niña occurs when ocean temperatures are cooler than normal and rainfall is reduced in the eastern to central Pacific Ocean.
El Niño and La Niña
“La Niña has finally ended after being in place nearly continuously for more than two years,” said Jon Gottschalck, chief of the operational prediction branch at NOAA’s Climate Prediction Center, a division of the National Weather Service. “ENSO-neutral — the transition period between El Niño and La Niña — is likely to continue into the early summer with elevated chances of El Niño developing thereafter. ENSO-neutral is factored into NOAA’s Spring Outlook.”
Moderate to exceptional drought coverage across the U.S. is at its lowest since August 2020 and is likely to continue improving, or end entirely, across much of California and the Great Basin. The spring wet season is expected to improve drought conditions across parts of the northern and central Plains. Current drought conditions in Florida are expected to improve or go away during the next three months.
Areas of extreme to exceptional drought across parts of the southern High Plains are likely to persist through the spring season, with drought also expected to develop into parts of New Mexico. Across parts of the Northwest U.S. and northern Rockies, drought conditions are also expected to continue. Drought may develop into parts of Washington state.
Above-average temperatures are favored for much of the southern and eastern half of the U.S. For April through June, the greatest chance for above-average temperatures exists from the southern High Plains eastward to Florida, and northward along the East Coast. Above-average temperatures are also likely for Hawaii and northern parts of Alaska. Below-average temperatures are predicted for the central Great Basin and the northern Plains.
California endures flooding, landslides, and evacuations
Parts of central and southern California that were still reeling from heavy snowfall earlier this month received yet another powerful atmospheric river which exited the region on March 15. Flooding, landslides, power outages, and evacuations are among the many impacts residents faced from the recent storm. The above graphic depicts most of the state receiving between 300-600% of normal precipitation over the last seven days. — USDA Water and Climate Update
Below-average precipitation like for the Southwest
NOAA forecasters predict above-average precipitation this spring across the Great Lakes, Ohio Valley, and into parts of the mid-Atlantic and Northeast. Below-average precipitation is most likely for the Southwest and parts of the Pacific Northwest.
https://www.waternewsnetwork.com/wp-content/uploads/2023/03/DWR-March-3-2023-snow-survey-Primary-1.jpg450845Mike Leehttps://www.waternewsnetwork.com/wp-content/uploads/2018/02/water-news-network.pngMike Lee2023-03-16 15:00:592023-03-16 17:26:55NOAA Spring Outlook: California Drought Cut by Half with More Relief to Come
Lake Powell is currently close to 180 feet below full pool and coming off a summer last year where several boat ramps were closed and owners were advised to retrieve their houseboats from the docks.
Releases from a couple of upstream reservoirs, including Flaming Gorge, were made last summer to help the nation’s second largest reservoir and its Glen Canyon Dam, which provides power generation to Wyoming, Utah, Colorado, New Mexico, Arizona, Nevada and Nebraska.
https://www.waternewsnetwork.com/wp-content/uploads/2018/02/water-news-network.png00Mike Leehttps://www.waternewsnetwork.com/wp-content/uploads/2018/02/water-news-network.pngMike Lee2023-03-14 09:50:472023-03-14 10:04:46More Moisture is Headed to Utah, the West. Will It Help Lake Powell?
The snow water equivalent of California’s snowpack is 190% of average for March 3, 2023. After three years of drought, the bountiful winter is good news, but a drier future demands more conservation and innovative solutions for water supply in the Southwestern U.S.
The snow water equivalent of California’s snowpack is 190% of average for March 3, 2023. After three years of drought, the bountiful winter is good news, but a drier future demands more conservation and innovative solutions for water supply in the Southwestern U.S.
The Department of Water Resources on March 3, conducted the third snow survey of the season at Phillips Station in the Sierra Nevada. The manual survey recorded 116.5 inches of snow depth and a snow water equivalent of 41.5 inches, which is 177% of average for the location on March 3. Snow water equivalent measures the amount of water contained in the snowpack and is a key component of DWR’s water supply forecast.
California’s Snowpack
DWR’s electronic readings from 130 snow sensors placed throughout the state indicate the statewide snowpack’s snow water equivalent is 44.7 inches, or 190% of average for this date.
Recent Storms
“Thankfully the recent storms combined with the January atmospheric rivers have contributed to an above-average snowpack that will help fill some of the state’s reservoirs and maximize groundwater recharge efforts. But the benefits vary by region, and the Northern Sierra, home to the state’s largest reservoir Lake Shasta, is lagging behind the rest of the Sierra,” DWR Director Karla Nemeth said. “It will also take more than one good year to begin recovery of the state’s groundwater basins.”
It Will Take More than a Single Wet Year to Recover Groundwater Levels in Some Parts of the State
Although the statewide snowpack is currently just behind the record snow year of 1982-83, the snowpack varies considerably by region. The Southern Sierra snowpack is currently 209 percent of its April 1 average and the Central Sierra is at 175 percent of its April 1 average. However, the critical Northern Sierra, where the state’s largest surface water reservoirs are located, is at 136 percent of its April 1 average. With one month of the traditional wet season remaining, DWR is providing updated runoff forecasts to water managers and is closely monitoring spring runoff scenarios and river flows to ensure the most water supply benefits from this year’s snowpack while balancing the need for flood control.
“The recent storms over the past week broke a month-long dry spell in a dramatic way,” said DWR’s Snow Surveys and Water Supply Forecasting Unit Manager Sean de Guzman. “We are hopeful that we will see more cold storms to add to our snowpack for the next month and help set up a long, slow melt period into spring.”
‘Good News’ but Conservation Remains Critical
“The results of today’s snow survey is good news for the state’s water supply, especially for those parts of the state that rely on snowmelt as their primary source of water,” said San Diego County Water Authority Water Resources Manager Jeff Stephenson. “The above average snowpack levels come after three consecutive years of drought that resulted in below normal water levels at the state’s major reservoirs. For the San Diego region, the recent local storms allow residents and businesses to turn off sprinklers and irrigation for at least several weeks, if not longer. This allows the region to keep more water in local reservoirs for use later in the year.”
— San Diego County Water Authority (@sdcwa) March 3, 2023
California’s Snowpack and a Hotter, Drier Climate
“Despite the recent wet weather and the region’s diverse water supply portfolio, the long-term forecast of a hotter, drier climate, for the Southwest U.S., means that water use efficiency remains a key part of saving our most precious resource, in wet or dry years,” added Stephenson.
Stephenson said that there are rebates and other free services available to residents and businesses of San Diego County that can help conserve water and save money.
“Recent storms combined with the Jan. atmospheric rivers have contributed to an above-average snowpack. But the benefits vary by region, and… it will also take more than one good year to begin recovery of the state’s groundwater basins.” – DWR Director Karla Nemeth pic.twitter.com/1yhJ4cm6F1
To ensure water supply managers have the most current forecasts of snowpack runoff, DWR is utilizing the best available technology to collect the most accurate snow measurements. DWR’s Snow Surveys and Water Supply Forecasting Unit is utilizing Airborne Snow Observatory (ASO) surveys across 12 of California’s major snow-producing watersheds to collect data on the snowpack’s density, depth, reflectiveness, and other factors down to a 3-meter resolution. These flights, which utilize LiDAR and imaging spectrometer technology, provide DWR with more information on water content than ever before, which is then fed into advanced physically based and spatially explicit models to generate the most accurate water supply runoff forecasts possible. These forecasts are used to develop the Bulletin 120 for forecasted spring run-off to determine water allocation and stream flows for the benefit of the environment.
Groundwater Basins ‘Slower to Recover’ From Drought
While winter storms have helped the snowpack and reservoirs, groundwater basins are much slower to recover. Many rural areas are still experiencing water supply challenges, especially communities that rely on groundwater supplies which have been depleted due to prolonged drought. It will take more than a single wet year for groundwater levels to substantially improve at a statewide scale. Drought impacts also vary by location and drought recovery will need to be evaluated on a regional scale and will depend on local water supply conditions.
On February 13, Governor Newsom issued an Executive Order directing state agencies to review and provide recommendations on the state’s drought response actions by the end of April, including the possibility of terminating specific emergency provisions that are no longer needed, once there is greater clarity about the hydrologic conditions this year.
Save Our Water
Californians should still continue to use water wisely so that we can have a thriving economy, community, and environment. DWR encourages Californians to visit SaveOurWater.com for water saving tips and information as more swings between wet and dry conditions will continue in the future.
DWR conducts five media-oriented snow surveys at Phillips Station each winter near the first of each month, January through April and, if necessary, May. The next survey is tentatively scheduled for April 3.
Fresh snow fell in the California mountains on Wednesday, adding to a staggering total that has blocked roads, stranded visitors for days, and left thousands of homes and businesses in the cold without electricity.
The Sierra Nevada range in the north and Southern California mountains were under blizzard warnings for a storm overnight into early Wednesday that snowed in some areas, dumped rain in others and chilled much of the state.
https://www.waternewsnetwork.com/wp-content/uploads/2018/02/water-news-network.png00Mike Leehttps://www.waternewsnetwork.com/wp-content/uploads/2018/02/water-news-network.pngMike Lee2023-03-01 09:58:112023-03-01 10:01:15To the Rooftops: Staggering Snowfall in California Mountains
With a much improved rainfall season and snowpack — at least for one year — the water allocation outlook for the area appears to be looking much better than in past years.
The federal Bureau of Reclamation has stated it’s requesting a 100 percent water allocation locally for Class 1 Friant contractors. In addition is stated it plans to request a 20 percent allocation for Class 2 contractors.
Lake Oroville, a key component of California’s water supply, looks noticeably fuller after a series of January storms.
The atmospheric rivers dumped trillions of gallons of moisture on the state, spurring widespread flooding and destruction but also providing a healthy boost to snowpack and drought-sapped reservoirs.
https://www.waternewsnetwork.com/wp-content/uploads/2018/02/water-news-network.png00Mike Leehttps://www.waternewsnetwork.com/wp-content/uploads/2018/02/water-news-network.pngMike Lee2023-02-13 10:20:322023-02-13 10:21:46Dramatic Photos Show Lake Oroville’s Rise After Epic Storms
