Global warming has already left its mark on the backbone of California’s water supply, and represents a growing threat to its first developed agricultural region, state experts have warned in a new study.
The Sacramento-San Joaquin Delta fuels California’s $3 trillion economy, including its $50 billion agricultural industry, sustains more than 750 plant and animal species and supplies 27 million people with drinking water.
Thousands of Central California farmers were warned Tuesday that they could face water cutoffs this summer as the state deals with a drought that already has curtailed federal and state irrigation supplies.
The State Water Resources Control Board notified about 6,600 farmers in the Sacramento-San Joaquin Delta watershed who have rights to use water from the Central Valley estuary of “impending water unavailability” that may continue until winter rains come.
In a sign of worsening drought, the state on Tuesday warned about 4,300 users to stop diverting water from the San Joaquin-Sacramento Delta watershed, stretching from Fresno to the Oregon border.
The notifications, which indicate that demand from farmers and cities is exceeding supply, are the widest-ranging move by state regulators since 2015 to restrict the use of water rights in a major watershed.
With very little water to spare this drought year, water districts struggling with limited or no supplies look to their counterparts in other districts to negotiate water transfers to add whatever flexibility they can.
Districts on the west side of the Central Valley, both north and south of the Sacramento-San Joaquin Delta, face the prospect of receiving no water from the Central Valley Project.
“Water transfers are absolutely critical to preventing a disaster on the west side of the Sacramento Valley this year. Other than groundwater, it’s the only water many of our folks have,” said Jeffrey Sutton, general manager of the Tehama-Colusa Canal Authority; the TCCA, a joint powers authority, serves 17 water districts in Tehama, Glenn, Colusa and Yolo counties.
More than a month after announcing it was suspending water deliveries to farmers on the west side of the San Joaquin Valley, the Bureau of Reclamation delivered equally bad news to farmers north of the Sacramento-San Joaquin Delta.
Their water supplies, tabbed at 5 percent of their contracted amount, were not available for delivery via the Central Valley Project due to limited supply.
With California in the throes of a second year of drought conditions, the mega-water agency of Southern California served notice Tuesday that it’s prepared to spend up to $44 million to buy water from Northern California to shore up its supplies.
The board of the Metropolitan Water District of Southern California, which serves 19 million urban residents, authorized its staff to begin negotiating deals with water agencies north of the Sacramento-San Joaquin Delta, where supplies are generally more plentiful.
On the tail end of the second dry winter in a row, with water almost certain to be in short supply this summer, California water officials are apparently planning to largely drain the equivalent of the state’s two largest reservoirs to satisfy the thirst of water-wasting farmers. Gov. Gavin Newsom must stop this irresponsible plan, which threatens the environmental health of the Sacramento-San Joaquin Delta and the water supply for about one-third of the Bay Area residents. We should be saving water, not wasting it. Employing conservation measures now will lessen mandatory water restrictions in the event of a long-term drought.
The Department of Justice can proceed with its claims that California violated state law when it changed its water quality control plan for the San Francisco Bay and Sacramento-San Joaquin Delta system in federal court, the Ninth Circuit ruled.
West Side farmers using the federal Central Valley Project can expect 5% to 75% of their contracted supply this year.
Two straight dry winters brought that announcement Tuesday from the U.S. Bureau of Reclamation. It involves water pumped from the Sacramento-San Joaquin Delta to as far south as Kern County.
Deltas globally adjust with changes and fluctuations in external conditions, internal dynamics, and human management. This is a short history of big changes to California’s Sacramento-San Joaquin Delta in the past and present, and its anticipated future. This history is important for understanding how many of the Delta’s problems have developed, changed, and continue to change.
The Water News Network is San Diego County’s source for water news and information.
