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Study a step toward managing Santa Rosa Plain water

  • Sonoma County Water Agency employees George Howard, left and John Mendoza monitor a water well Wednesday off Todd Road in Santa Rosa. (Kent Porter / The Press Democrat)

Tackling one of the American West's most contentious issues, a new government report assesses the demands on Sonoma County's largest underground water source against a future that includes population growth, agricultural needs and the wild card of climate change.

The report by the U.S. Geological Survey provides a detailed profile of the groundwater beneath the 261-square-mile Santa Rosa Plain watershed, home to about half the county's population, including the cities of Santa Rosa, Windsor, Sebastopol, Cotati and Rohnert Park.

About 12,000 wells operated by the five cities, the county water agency and private homes and ranches on the Santa Rosa Plain pump about 53,000 acre-feet of water per year from the ground, matching the amount of water the agency draws from the Russian River.

“We are planning for an uncertain future,” said Marcus Trotta, a Sonoma County Water Agency hydrogeologist.

The 199-page report, packed with hydrologic and geochemical data, is the first study of the underground watershed in 30 years and part of the cornerstone for an ambitious effort to establish a groundwater management plan for the Santa Rosa Plain.

A 30-member Basin Advisory Panel representing cities, water customers, agriculture, industry and environmentalists intends to develop, by late this year or early 2014, a plan to “manage, protect and sustain groundwater resources” in the plain.

It's a chore that will require balancing competing interests, such as urban growth versus agricultural demand, and accounting for a future fraught with more volatile weather — droughts alternating with floods — brought on by climate change.

“Future growth in population and demand for water coupled with a changing climate ... are likely to increase stresses on the region's groundwater resources,” said a groundwater primer prepared by the Water Agency.

“We have to maintain it,” Sonoma County Supervisor Shirlee Zane said, noting that “we can't build new houses or have new farms without water.”

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