flooding

Powerful El Niño puts California in the bull’s-eye for soaking winter

Anthony Edwards, SAN FRANCISCO CHRONICLE

One of the world’s top climate models puts a bull’s-eye on the California coast as El Niño strengthens, with a greater than 90% chance of above-normal precipitation from December through February. There’s at least a 70% chance of well-above-normal precipitation.

That outlook is from the European Center for Medium-Range Forecasts, which on Wednesday released its first full supercomputer forecast that includes 51 model simulations of winter.

The California coast could receive 40% to 70% more precipitation than normal from December through February, according to the model. That would put San Francisco at more than 20 inches of rain in that time, which historically happens about once every five years.

Read more at https://www.sfchronicle.com/weather/article/el-nino-california-rain-22375495.php

Climate Change & Energy, , , ,

Tools tweak beaver dams

Mark DeGraff, KNEEDEEP TIMES

CDFW Beaver Restoration Program

The town of El Dorado Hills, California was facing a problem. A beaver dam had inundated a popular walking trail. The community wanted to reverse the flooding without harming their buck-toothed neighbors.

Beaver experts visited the area and proposed a simple solution: a flood-control pipe threaded through the mass of sticks and mud that formed the dam. Once installed, the pipe quickly lowered the water level. Today, the trail remains dry, and beavers still call El Dorado Hills home.

Projects that help beavers and humans coexist have only grown easier since 2018, when El Dorado Hills began its beaver friendly project. Last October, Occidental Arts & Ecology Center launched the Beaver Help Desk, a state-funded resource that matches beaver-beleaguered landowners like the ones in El Dorado Hills with certified beaver coexistence professionals. It’s just one of a flood of new efforts to restore the water-storing rodent to its former habitats across California.

Beaver habitat restoration has become a priority among landowners, legislators, and environmentalists alike as climate change threatens the state’s ecosystems and water supply. A growing body of evidence has found that beavers were once abundant throughout California, and bringing them back will foster climate resilience. They build ponds where salmon can weather dry summers and create wet meadows that serve as firebreaks. One study calculated that repopulating the Sierra Nevada with beavers would create enough dams to store 32 billion gallons of water, making an area three-quarters as large as Yosemite wet enough to resist wildfires.

Read more at https://www.kneedeeptimes.org/tools-tweak-beaver-dams/

Water, Wildlife, , , ,

King tides and winter runoff push Petaluma River to highest recorded level in decades

Don Frances, BAY AREA NEWS GROUP

An extraordinarily strong bout of seasonal king tides and runoff from the latest rainstorm combined Friday to push the crest of the Petaluma River to the highest point in nearly the last three decades even as bay tides unleashed flooding in Marin County and other parts of the Bay Area before a weekend of rain and high winds.

The Petaluma River, one of Sonoma County’s largest tidal sloughs, had not topped its banks, but water levels surged to 8.33 feet by 1 p.m. Friday, according to a National Weather Service gauge at the D Street Bridge, where the previous recorded high was 6.4 feet in 1998.

The new record was likely to be broken again by late morning Saturday as the king tides were expected to peak amid the incoming rainstorm, said National Weather Service meteorologist Rachel Kennedy.

Read more at https://www.pressdemocrat.com/2026/01/02/king-tides-and-winter-runoff-push-petaluma-river-to-highest-recorded-level-in-decades/

Water, , ,

Sonoma County emergency preparedness falls short, grand jury says, warning of ‘chaotic, life-threatening’ evacuations

Emma Murphy, PRESS DEMOCRAT

The report comes weeks after local fire officials warned the region is likely to experience a long peak fire season.

Despite years of work and extensive investments to bolster its disaster planning and response, Sonoma County remains ill-prepared for emergency evacuations in the event of another regional firestorm, flood or other major disaster, the county’s civil grand jury has concluded in a new report.

The stinging assessment comes even after the strides the county, local cities and grassroots groups have taken after the 2017 firestorm and subsequent disasters to improve planning for the type of large emergencies that can displace thousands of people at a time.

The tools and protocols now in place, the grand jury found, function only as a foundation for evacuation plans — and those plans, covering much of the region, lack the detailed, proactive steps to ensure they can work, especially along the county’s sprawling rural road network, the new report says.

The panel faulted the county for its lack of modern modeling technology to evaluate evacuation routes and plan around known traffic choke points. The county also depends too heavily on cellphone networks and the internet to communicate alerts — an unreliable method for rural residents, according to the 20-page report.

“Without accelerated investment in planning, communications, and road improvements — and full compliance with California’s legal standards — the risk of chaotic, life-threatening evacuations remains high,” the report states.

Read more at https://www.pressdemocrat.com/article/news/sonoma-county-grand-jury-emergency-evacuations/

Climate Change & Energy, Transportation, , ,

Staffing cuts to National Weather Service river forecast center could leave Sonoma, Napa counties ‘flying blind’ ahead of storms

Austin Murphy, PRESS DEMOCRAT

The short-staffed California Nevada River Forecast Center, a small Sacramento field office of the National Weather Service, has outsized importance to North Bay residents. Its operations are imperiled by downsizing and proposed cuts.

The closer you live to the Russian River, the likelier it is you’ve spent time on this no-frills website, whose wavy, colored lines alert users when the river is approaching flood levels, and when it will recede.

The site is maintained by the California Nevada River Forecast Center, or CNRFC, under the umbrella of the National Weather Service. It’s one of 13 forecast centers preparing “timely river and flood forecasts” for some 4,000 river locations across the nation.

The California Nevada forecast center is a small field office, based in Sacramento. But its work has outsized importance to North Bay residents.

The data it collects during heavy rains helps emergency service officials figure out who needs to be evacuated as the region’s largest rivers rise, none packing a more destructive, dangerous punch than the Russian.

The CNRFC also provides information vital to Sonoma Water, the Army Corps of Engineers and other agencies, as they make decisions on when to release water from reservoirs, and how much.

But now, in the face of cuts and attrition engineered by the Trump administration, that office is operating with a little over two-thirds of its usual workforce. Under Trump, staff shortages have become endemic in offices throughout the National Weather Service.

Read more at https://www.pressdemocrat.com/article/news/flooding-forecasts-trump-cuts/?ref=sf-rail-2

Water, , , ,

Russian River communities feel blindsided by recent changes to flood zones

Marisa Endicott, PRESS DEMOCRAT

☛ Permit Sonoma webpage with FEMA Flood Hazard & Zoning Update Map

A change to federal flood zones could affect insurance rates, property values and building, especially along the lower Russian River.

Nick Schwanz went to a Sonoma County Board of Supervisors meeting in November to weigh in on a particular agenda item.

He was surprised to learn, however, that another item, which appeared to be a routine and technical set of zoning adjustments, actually carried huge implications for his community.

Schwanz, a board member of the Russian River Chamber of Commerce, quickly pivoted and became one of the few to comment on an apparent change to the federal flood zones that could affect insurance rates, property values and building especially along the lower Russian River.

“As far I know this isn’t on anybody’s map,” Schwanz said.

Supervisors, too, seemed taken by surprise.

“This was sort of framed to me as technical corrections, and honestly the way the data was presented made it impossible to see the bigger picture,” said Fifth District Supervisor Lynda Hopkins, who represents much of the affected area. “When we have constituents coming to us who received a notice in the mail yesterday and have no idea what it means, that’s a failure of community engagement. That’s a failure of communication, and we need to do better. I can’t in good conscience vote on this.”

At issue was a new study by the Federal Emergency Management Agency of flood hazards in the Russian River Watershed, the first update in 30 years. The maps are used to determine flood risks and insurance requirements and must be adopted by counties to participate in the National Flood Insurance Program.

Read more at https://www.pressdemocrat.com/article/news/russian-river-fema-flood-zones/

Land Use, Water, , , , ,

Op-Ed: Saving rainwater for sunny days to come

Grant Davis, PRESS DEMOCRAT

The current water year, which began Oct. 1, has been wetter than usual, with the Russian River watershed accumulating 119% of the yearly average rainfall, totaling 49.38 inches since October.

In the past, we might have celebrated our good fortune and watched lake levels rise only to watch much of it sent downriver to the Pacific Ocean as reservoirs reached an inflexible upper threshold. Today, we get to continue enjoying that ample rainfall long after summer sunshine arrives.
Empty
Grant Davis

With almost a decade of data under its belt, the Russian River Forecast-Informed Reservoir Operations program has been making great strides by demonstrating the viability of this strategy to operate reservoirs more effectively using modern technology and forecasting.

This year, we expect the new method to ensure an additional 19,000 acre-feet of water in the Lake Sonoma reservoir heading into the summer, just as it did last year, thanks to our ability to leverage weather forecasting techniques and adapt how we manage our reservoirs. Add to that another 9,000 acre-feet stored in Lake Mendocino. An acre-foot equates to 325,851 gallons.

That 28,000 acre-feet represents a substantial savings, or almost 65% of Sonoma Water’s annual demand, given that the agency is projecting its three-year average annual water sales to be just under 43,000 acre-feet.

Read more at https://www.pressdemocrat.com/article/opinion/sonoma-drought-water-dam-storage/

Water, , , , , ,
Scroll to Top