A landmark report from the United Nations’ scientific panel on climate change paints a far more dire picture of the immediate consequences of climate change than previously thought and says that avoiding the damage requires transforming the world economy at a speed and scale that has “no documented historic precedent.”
Snowmelt is shrinking and runoff is coming earlier on the Upper Colorado River, the source of 90 percent of water for 40 million people in the West. This is leading to vegetation changes, water quality issues and other concerns. But it may be possible to operate reservoirs differently to ease some of these effects. In September’s episode of Deeply Talks, we spoke with two experts about the consequences and opportunities of these changes on the river.
The biggest ticket item on California’s November ballot, tucked between the governor’s race and local elections, is $8.9 billion in bonds to help modernize California’s sprawling waterworks. The measure, which was authored by a former state water director, would fund scores of projects, from shiny new desalination plants to upgrades of old dams and aqueducts to restoration of tainted watersheds, including San Francisco Bay. The initiative, Proposition 3, comes as a historic drought has exposed the vulnerabilities of California’s water infrastructure, and it has become apparent that hotter, drier times ahead will test the adequacy of state supplies.
Barely a week past summer, some Sierra Nevada peaks have received a dusting of snow — and a bigger accumulation is possible this weekend. The unsettled weather and brisker-than-normal temperatures that have lingered in the Bay Area this week brought hail and snow to the higher elevations of the Lake Tahoe area. The National Weather Service’s Reno office said that another wave of precipitation Friday night and Saturday could see an accumulation of 1 to 2 inches of snow at the higher passes, such as Tioga and Sonora. The greatest chance of snow showers at Yosemite’s Tuolumne Meadows is after 11 p.m. Saturday, the weather service said.
Water saving in urban California continued to slide in August, but Butte County agencies generally conserved twice as much water as the rest of the state. The State Water Resources Control Board reported Tuesday that statewide, water use was down 12.6 percent in August, compared to August 2013. That’s a decline from 13.6 percent in July, 16.8 percent in June, and 20.2 percent in May. The numbers have been dropping fairly steadily since April 2017, when Gov. Jerry Brown declared the drought over, and mandatory conservation targets were dropped. The state actually used more water this February than in 2017, then conservation jumped to 24.8 percent in March, but has been declining since.
Sites Reservoir, the largest new water storage proposal in California, recently won a commitment of $816 million in state funds to help with construction. It promises to deliver enough water every year, on average, to serve one million homes. But regulatory realities looming in the background may mean the project has substantially less water at its disposal.
State law does not currently allow surface water to be used for groundwater recharge if the goal is managing pollution, reversing subsidence or controlling salinity. That could be a problem as local agencies begin trying to make their groundwater use more sustainable. Groundwater depletion is a big problem in parts of California. But it is not the only groundwater problem. The state also has many areas of polluted groundwater, and some places where groundwater overdraft has caused the land to subside, damaging roads, canals and other infrastructure. Near the coast, heavy groundwater pumping has caused contamination by pulling seawater underground from the ocean.
The Lake Oroville spillway’s 400-acre construction site is an intense flurry of activity. In one corner, an excavator driver uses an old tire as a squeegee to clean away loose rock and prep a foundation. In the steeply sloping spillway chute, a crane operator flies in a rebar cage to workers who tie it into neighboring chute wall segments. Everywhere, dump trucks buzz around the circuitous roadways while rock crushers and batch plants keep pace with dozens of dozers and excavators. Drones hover in the sky photographing and surveying the site, while inspectors pour over every detail of the finished assets.
Rep. Jeff Denham, one of the nation’s most vulnerable Republicans, is trying desperately to shut down a state water plan that’s widely disliked in his district. But nothing has worked so far. One thing could: Yet another lawsuit between the Department of Justice and the state of California over the issue. Denham first tried to include a provision in a congressional budget bill in July that would prevent a federal reservoir, called New Melones, from using federal dollars to participate in the plan, which would direct greater amounts of water out of his district’s water resources and into the ocean, purportedly to help salmon populations.
Monday marked the beginning of the 2019 water year. Experts say it’s hard to know what this year will bring – considering the state’s significant weather variability on a year-to-year basis – but steps are being taken to prepare in spite of the uncertainty. “It’s been relatively dry so far this past water year, but it’s no indication of what kind of year we are going to have in Water Year 2018-19,” said Mike Inamine, executive director of the Sutter Butte Flood Control Agency.
