Tag Archive for: Climate Change

Lake Tahoe Water Level Hits Four-Year Low as Drought Pummels Tourist Spot

/in , /by /The Guardianby Dani Anguiano

Lake Tahoe’s water level dropped to a four-year low on Tuesday as gusty winds and the impacts of California’s devastating drought hit the popular tourist destination.

After days of high winds increased evaporation rates, water levels fell to the basin’s natural rim for the first time since 2017, the end of the state’s last drought. The lake normally sits above the rim, which allows for water to flow into the Truckee River. Levels will probably continue to drop, receding below the rim this week, sooner than expected.

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Atmospheric Rivers-Water Year 2021-drought-climate

Atmospheric Rivers Left California Mostly Dry in Water Year 2021

/in , /by

The Center for Western Weather and Water Extremes, or CW3E, at Scripps Institution of Oceanography, released its report October 11 on atmospheric rivers during Water Year 2021.

The report, “Distribution of Landfalling Atmospheric Rivers over the U.S. West Coast During Water Year 2021: End of Water Year Summary” shows that more atmospheric rivers landed on the U.S. West Coast in Water Year 2021 than in Water Year 2020. But the majority of those storms reached the Pacific Northwest, not California, where drought conditions have impacted water supply.

“The report on atmospheric rivers shows the variability in weather across the state from year to year,” said Jeff Stephenson, Water Resources Manager with the San Diego County Water Authority. “Through our partnership with CW3E and the AR forecasting tools they’ve developed, it better prepares us in management of our water resources using regional storage. This storage, in conjunction with developing multiple water supply sources in the San Diego region, has prepared us for years when rainfall levels are below normal in the region.”

The summary report from CW3E

Water Year 2021 experienced a total of 69 landfalling ARs over the U.S. West Coast, 4 more than Water Year 2020.
• While WY 2021 experienced more ARs, a much larger majority of the ARs only impacted the Pacific Northwest.
• California only experienced AR conditions (IVT >250 kg m–1 s–1) from 36 separate ARs during WY 2021, compared to 43
during WY 2020.

Atmospheric Rivers-Water Year 2021-drought-climate

Distribution of Landfalling Atmospheric Rivers over the U.S. West Coast During Water Year 2021: End of Water Year Summary. Graphic: Center for Western Weather and Water Extremes

Fewer Atmospheric Rivers in California

The lack of AR activity over California for two consecutive water years has resulted in a substantial lack of precipitation.
• A large portion of California received <30% of the normal precipitation for both Water Year 2020 and 2021.
• Coastal Washington and Oregon was the only location in the Western U.S. to receive near or above normal precipitation
during both water years, which is also the region that received a majority of the AR activity.

California experienced strong or greater magnitude AR conditions only three times during WY 2020 and 2021 combined

Atmospheric Rivers-CW3E-drought-climate

Atmospheric Rivers-CW3E-drought

The San Diego County Water Authority partnered with the Scripps Institution of Oceanography, Center for Western Weather and Water Extremes, at UC San Diego in 2020 to better predict atmospheric rivers and improve water management before, during, and after those seasonal storms. The Center and its partners share best practices in forecast-informed reservoir operations, increased research around atmospheric rivers and droughts, and develop strategies for mitigating flood risk and increasing water supply reliability.

For additional details and graphics go to: https://bit.ly/3mKhkcR

Lake Tahoe Falls to Alarmingly Low Level – Environmental Impacts Could Result

/in , , /by /San Francisco Chronicleby Gregory Thomas

This week, a historically dry period in California will come to bear at Lake Tahoe, where the water level is expected to sink below the basin’s natural rim. That’s the point at which the lake pours into its only outflow, the Truckee River.

It’s not a crisis, researchers and conservationists say, but it marks another extreme swing for Tahoe amid historic drought, wildfires and erratic weather, all intertwined with climate change and becoming more prominent aspects of the alpine environment.

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Southwest Conditions Historically Dry Since 2020, Report Finds

/in , , /by /Las Vegas Review-Journalby Blake Apgar

People who live in the Southwest know it’s been especially hot and dry the past couple of years, but a new government report shows those conditions are actually historic.

Precipitation across multiple basins in six states from January 2020 through August 2021 was the lowest recorded since researchers started tracking with gauges in the late 1800s.

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Hydropower Decline Adds to the Strain on Power Grids in Drought

/in , /by /NBC 4

After water levels at a California dam fell to historic lows this summer, the main hydropower plant it feeds was shut down. At the Hoover Dam in Nevada — one of the country’s biggest hydropower generators — production is down by 25%. If extreme drought persists, federal officials say a dam in Arizona could stop producing electricity in coming years.

Severe drought across the West drained reservoirs this year, slashing hydropower production and further stressing the region’s power grids. And as extreme weather becomes more common with climate change, grid operators are adapting to swings in hydropower generation.

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Colorado River Drought Conditions Spur Calls for Better Water Infrastructure

/in , , /by /Tucson Sentinelby Ariana Figueroa

Experts in government, agriculture, water management and the environment stressed during a U.S. Senate hearing on Wednesday the danger that droughts fueled by climate change pose in the West, including the Colorado River Basin.

During a hearing before an Energy and Natural Resources Committee panel, witnesses said long-term solutions and an investment in water infrastructure are needed to combat the effects of climate change.

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Un Agency Warns of Looming Global Water Crisis

/in , , /by /The Hillby Zack Budryk

Climate change is poised to result in a worldwide water crisis, and international institutions and governments have not done enough to prepare, according to a report released Tuesday by the World Meteorological Organization (WMO).

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Corps of Engineers Considers Nature-Based Flood Control

/in , /by /U.S. Newsby Travis Loller, Associated Press

The U.S. Army Corps of Engineers is known for damming rivers and building levees to keep waterways at bay. But a new initiative seeks natural flood control solutions as climate change brings increasingly frequent and severe weather events that test the limits of concrete and steel.

It only makes sense to use Mother Nature’s flood defenses as one of the tools to combat destruction from intense rains in the middle of the country and storms and sea level rise on the coasts, says Todd Bridges, who heads the Corps Engineering with Nature initiative.

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Opinion: Happy New Water Year — Californians Have to Face Some Difficult Wet Season Truths

/in , /by /Los Angeles Times by Peter Gleick

Happy New Water Year. For those of us who work on California water challenges, the start of the new year isn’t Jan. 1; it’s Oct. 1, the official beginning of the state’s wet season. This is the time of year we start to look out over the Pacific for the storms we hope will bring life-giving precipitation, replenishing our rivers and streams, coating our mountains with snow, refilling our reservoirs and recharging our soils, forests, wetlands and groundwater.

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Inspect your sprinkler heads regularly to make sure they are not obstructed or watering onto pavement or other hardscapes. Photo: Irrigation Association

Give Your Irrigation System a Fall Checkup

/in , /by

Staying on top of your irrigation system – especially in the midst of a drought – can mean the difference between maximizing your water efficiency and unknowingly wasting water running down sidewalks unused into the storm drain. Follow these tips for a thorough checkup.

Turn on each valve of your irrigation system and observe how quickly water begins to run off your landscaping. Note the time when each runoff occurs. For some systems, this could be immediate. For others, it may take as long as five minutes.

Make sure spray irrigation is never running for longer than eight minutes at any one time.

Take notes on your irrigation plan, and turn off your irrigation until you can fix the following issues:

  • Do you have broken sprinkler heads?
  • Are there heads that are blocked by plants or objects such as planters or lights?
  • When the system turns off, does water come out of the lowest heads in the landscape?
  • Are any heads in need of adjustment, so they don’t directly spay onto the hardscape, such as sidewalks or patios?

Adjust your sprinklers to eliminate runoff

Don't allow your spriinklers to overspray your landscaping and waste water. Photo: Wikimedia irrigation tips

Don’t allow your sprinklers to overspray your landscaping and waste water. Photo: Wikimedia

Several things can be done to minimize runoff due to irrigation. This is among the most important factors in using irrigation efficiently.

  • Tune up spray irrigation systems, so there is no overspray on hard surfaces
  • Do not install spray irrigation in areas that are too narrow (generally eight feet wide or narrower)
  • Move spray heads 24 inches away from buildings or impermeable surfaces
  • Convent spray systems to micro or drip irrigation with pressure regulation and a filter
  • In lawn areas, be sure to follow the organic maintenance practices to keep your soil ‘spongy’ (link to soil post)
  • Replace standard overhead sprayers with high-efficiency rotator nozzles, or other types of low precipitation rate nozzles

This article is part of a year-long series inspired by the 71-page Sustainable Landscapes Program guidebook. The Water Authority and its partners also offer other great resources for landscaping upgrades, including free WaterSmart classes at WaterSmartSD.org.