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A quarter-century ago, San Diego and its suburbs imported 95% of their water supplies. Thanks to investments in desalination and other efforts to boost supplies, that figure has already dropped to 57% and is projected to fall to just 18% sometime in the next two decades.

San Diego has gone from being one of the most vulnerable areas of California during drought to one of the best prepared — and in so doing has become a model for the future of water use in cities.

Another bout of rainy weather is expected to drench the Southland beginning late Wednesday. According to the National Weather Service, a low pressure system will bring rounds of showers and thunderstorms into Southern California over the next few days.

Weather experts have forecast drizzle on Wednesday growing to a 40-percent chance of showers Thursday evening and increasing through Sunday across the San Bernardino area and the Inland Valley, according to the NWS website. “A few thunderstorms could occur… especially Friday when the system is overhead,” according to an NWS report.

Responding to the statewide drought, San Diego consumers reduced county per-capita residential water use 13 percent last year, dropping the total water use among local agencies by 112,700 acre-feet. The water districts in Rainbow and Valley Center fell 49 percent in use per capita. “We need to create new water supplies but we have to use less water,” said Mark Weston, chairman of the San Diego County Water Authority.

The water crisis in Borrego Springs is as simple to understand as it will be difficult to solve. The elephant in the room is farming.

Citrus and palm ranches in northern Borrego Springs are sucking huge amounts of water from the underground lake beneath their land — far more than the state is likely to allow in the future. The problem: Borrego Springs, home to about 3,000 permanent residents in the desert of northeast San Diego County, has no feasible way to import water.

San Diego County will continue to have a safe and reliable water supply for decades because of the development of drought-resilient water resources and emphasis on water-use efficiency, according to the San Diego County Water Authority’s draft Urban Water Management Plan.

The draft plan was released for public review, starting a public comment period that will include a public hearing on May 26 during the regular meeting of the Water Authority Board of Directors. The board will consider adoption of the plan during its regular meeting on June 23.