California and Nevada have had extremely heavy rainfall in recent days, during one of the severest droughts the region has ever seen.
So what does that mean for the water levels at Lake Mead?
Californians have suddenly turned their attention from drought to flooding.
The future likelihood of a series of huge atmospheric rivers in California, a so-called ARk storm scenario, seems to be a certainty. Atmospheric rivers channel moist tropical air towards the West Coast, where mountains condense it to rain and snow. Over the last few weeks, California has suffered through a sneak peak of its devastating potential.
As California emerges from a two-week bout of deadly atmospheric rivers, a number of climate researchers say the recent storms appear to be typical of the intense, periodic rains the state has experienced throughout its history and not the result of global warming.
Although scientists are still studying the size and severity of storms that killed 19 people and caused up to $1 billion in damage, initial assessments suggest the destruction had more to do with California’s historic drought-to-deluge cycles, mountainous topography and aging flood infrastructure than it did with climate-altering greenhouse gasses.
A malfunction at a wastewater pumping station spilled 500,000 gallons of raw sewage into San Diego Bay, authorities said.
More than six miles of shoreline were closed or posted with warning signs after the spill Monday afternoon sent untreated wastewater flowing out of manholes and into storm drains downtown and in the Midway area instead of going to a treatment plant, the San Diego Union-Tribune reported Wednesday.
Fast action by the San Diego County Water Authority and its partners is helping maintain water service in Tijuana after problems with the city’s aqueduct emerged in December.
Emergency water deliveries started last week after a coordinated effort between the Water Authority, Otay Water District, and Metropolitan Water District of Southern California (MWD). The typical multi-month approval process was compressed into a few days to avoid additional water supply shortages in Tijuana.
Many years ago, scientists predicted climate change would result in more intense weather swings, the likes of which California is currently experiencing: extended stretches of drought interrupted by periods of hard rains.
Now as before, people raise the same question when atmospheric rivers hit and massive storm runoff flows into the ocean: Why can’t we capture more of that and store it for the dry seasons?
Torrential rain across California in recent weeks has caused plenty of misery, but it could also generate some good news on the energy front: If rain and snow totals hold up, all the precipitation will boost hydroelectric production — and that would help the Golden State’s electric grid, especially in the summertime when the system comes under strain.
“Based on the reservoir levels and what we’re seeing this year, we expect to have more hydroelectricity generated this year than we have for the last several years,” said Lindsay Buckley, director of communications at the California Energy Commission.
Across the sun-cooked flatlands of the Imperial Valley, water flows with uncanny abundance. The valley, which straddles the U.S.-Mexico border, is naturally a desert. Yet canals here are filled with water, lush alfalfa grows from sodden soil and rows of vegetables stretch for miles.
Within this grid of greenery, near the desert town of Brawley, Mark McBroom grows 6,000 acres of hay crops, like alfalfa, and fruit orchards, all irrigated by water imported from the Colorado River.
San Diego’s recent rainstorms was a much-needed boost to 24 reservoirs around the county.
“We talk about often as pennies from the sky and yesterday was millions from the sky,” smiled Carlos Quintero, the General Manager for the Sweetwater Authority.
Quintero said the Sweetwater Reservoir in Spring Valley collected about 1,700 acre-feet of water on Monday alone.
The storms that have been battering California offer a glimpse of the catastrophic floods that scientists warn will come in the future and that the state is unprepared to endure.
Giant floods like those that inundated the Central Valley in 1861 and 1862 are part of California’s natural cycle, but the latest science shows that the coming megafloods, intensified by climate change, will be much bigger and more destructive than anything the state or the country has ever seen.
