After Last Week’s Storm, April is Already 3rd Wettest Month on Record
Although a mere 13 days old, this is the third-wettest April on record in San Diego, the National Weather Service reported Monday.
Tag Archive for: Water Year
California’s water year starts with a large increase in reservoir storage. Here’s why
California is enjoying an increase in average water reserves due to increases in snowfall and precipitation, according to the Department of Water Resources.
Statewide, the reservoir is at 128 percent of average, which is about 29.7 million acre-feet. Some of the biggest increases include Lake Oroville, which is currently at 102 percent of its average, compared to 62 percent this time last year; Shasta Lake is at 126 percent (88 percent in 2018) and San Luis Reservoir is at 132 percent (117 percent last year).
A Wet Winter Will Likely Lead To A Whale Of A Year For Hydro In California
Plenty of snow in the Sierra and lots of rain just about everywhere else in California have helped alleviate drought conditions across the state. But there’s also another positive byproduct of the wet winter — a likely boost in the amount of hydroelectricity in California’s energy mix. “I’m looking at the reservoirs in the state and I see almost all of them at the historical average in terms of storage,” said Ghassan Alqaser, chief of the State Water Project Power and Risk Office at the California Department of Water Resources. “With that, we expect an above average hydro year.”
A Recap Of California’s Water Year So Far
When the skies clear and the weather gets calmer, it’s a good time to take stock of our storms and see where we are with water in California. Starting with snowpack, Sierra storms have been strong lately, with many adding feet of fresh, new snow. As of Monday, the snow is above average at 111 percent, and that number is expected to grow with additional snow from the last storm. About 30 percent of California’s water comes from snowpack, so when that metric is in good shape, it tends to set the tone for other indicators.
2018 Another Dry Year for California
As the Golden State moves into 2019, it will close the book on an abnormally dry year with hopes that a few rain storms can stave off the prospect of another drought. Two consecutive years of devastating wildfires killing dozens of residents, causing billions in property damage and reducing millions of acres to ash has demonstrated the effects of the prolonged drought stretching from 2012 until 2017. Storms finally brought much-needed precipitation in 2017, replenishing reservoirs and aquifers, but the moisture content in the forest vegetation and the swathes of dead trees in the Sierra Nevada attest to the consequences of the sustained dry weather.
Water Supplies Sufficient for 2019 Demands Despite Hot, Dry Weather
At the start of the 2019 water year, the combination of diversified water supplies and water-use efficiency means the San Diego region has enough water for 2019 and the foreseeable future despite historically low rainfall over the past 12 months.
“It has been very hot and dry, but we have invested wisely in infrastructure and regional water-use remains well below where it was at the start of the last drought,” said Jeff Stephenson, a principal water resources specialist with the Water Authority. “In fact, potable water use over the past three-plus years was 17 percent below 2013, which shows that San Diego continues to live WaterSmart.”
Still, said Stephenson, “we are looking for a wet winter locally, and in the Sierra and Rocky Mountains, to help replenish reserves for future years.”
Water managers use “water years” that run from October 1 through September 30 to track rain and snow. Local rainfall during water year 2018 totaled just over 3 inches at Lindbergh Field – 67 percent below normal and the second-lowest in San Diego history dating back to 1850.
In addition, local temperatures have been significantly above normal for most of the past five years. In many of those months, the average daily maximum temperatures were more than 4 degrees above long-term averages.
Forecasts predict continued warm weather conditions through December
The National Weather Service’s Climate Prediction Center forecasts continued warm conditions for California through December, with a 33 percent probability of above-normal precipitation locally. The U.S. Drought Monitor’s classification of San Diego County as an area of “Severe Drought” is based on weather factors – but it does not reflect water supply conditions.
More than $3.5 billion in regional water investments by San Diego County ratepayers over the past three decades mean water supplies will meet demands regardless of the weather.
New supplies and infrastructure upgrades include the Claude “Bud” Lewis Carlsbad Desalination Plant, which delivers approximately 50 million gallons of potable water per day for regional use, along with a ramp-up of water delivered to San Diego County as part of a long-term water conservation and transfer deal signed in 2003.
Other regional assets include the storage of 100,000 acre-feet of water behind the raised San Vicente Dam due to conservation efforts during the last drought. In addition, many key reservoirs statewide, including Diamond Valley Lake in Riverside County, remain near average levels for this time of year. Significantly, no shortages are expected on the Colorado River system in 2019, though long-term drought conditions continue to be a concern across the Southwestern U.S.
The Water Authority offers several programs, including a Landscape Transformation program rebate, to promote water-use efficiency. Residents and business can also attend free sustainable landscaping classes, and access online videos and tips. To learn more about those resources and others, go to WaterSmartSD.org.
