- Posted July 12, 2014 by
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California Drought Deepens as Voluntary Cutbacks Fall Short
Californians fall short of 20% water reduction called for by Governor Brown as extreme drought covers 80 percent of the state. El Nino unlikely savior as water supplies shrink and state heads for driest year on record.
California’s water woes are not going away. Recent reports issued by the National Oceanic and Atmospheric Administration say a possible El Nino year may not be enough to break the drought. Even though there is an 80% chance of the next winter being an El Nino, only 1 El Nino in 7 has the power to alleviate California’s current water shortage.
Replenishing California’s water is not just a matter of refilling the drying lakes and reservoirs which are now at 20% capacity. To make up for the reduced water supplies at the state level, local agencies and farmers are pumping additional ground water for irrigation.
In a January message, Gov. Jerry Brown asked residents to cut their water use by 20%. However, California's most recent drought report shows residents have only achieved a five percent reduction.
Doug Parker, director at University of California Institute for Water Resources says, “We really need to be prepared for more drought.”
Because of the mechanics of warming water and air affecting global air circulation, the El Nino condition does not guarantee a wet year. Mr. Parker says, "There's a pattern of dry years happening so there's a higher probability that next year will be a dry one."
During dry years when water supplies are restricted, ground water is pumped from aquifers to make up water needed for both domestic and agricultural needs. Pumping out more ground water than is available to recharge the aquifers leads to salt water intrusions. The salt contaminates the remaining ground water, often making it unfit for drinking or irrigation.
El Nino conditions bring heavier precipitation just 1/3 of the time. Recent El Nino storms in 1982-83 and 1997-98 brought torrential rains, flooding and heavy destruction but still did not restore the ground water. Parker’s concerns are echoed by Mike Dettinger, USGS Hydrologist and research associate at Scripps Institution of Oceanography.
The wet / dry El Nino / La Nina cycle is thrown out of balance in already droughted years. Mike Dettinger warns, “In a major drought situation like the past two years, it is more important to think about the range of El Nino outcomes than to depend on an average.”
"We've gotten our driest years and our wettest years from El Niño," said Mr. Dettinger. His recent published report suggests it would take one of the strongest El Ninos for the last 80 years to make up for the previous deficits years that have drained the ground water and reservoirs.
Formation of the El Nino condition requires the trade winds die down long enough for the condition to grow and strengthen and push heated moist air into California. Climate change has already upset the trade winds and heating cooling patterns. NOAA's Climate Prediction Center won't declare an official El Niño until the increase in sea surface temperature, measured by buoys in the eastern Pacific, averages more than 0.5 degrees Celsius for five consecutive three-month periods.