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Groundwater [ edit ] The Water Agency is involved in a number of programs and initiatives to study the groundwater resources of the region through the Santa Rosa Plain Groundwater Program, the Sonoma Valley Groundwater Program, the Stormwater/Groundwater Recharge Program, and the Salt and Nutrient Management Plans.
As the stream approaches the Santa Rosa Plain immediately east of U.S Highway 101, slopes diminish to a gradient of five to 15 percent and the predominant soil type is Felta very gravelly loam. This Felta soil is characterized by an upper surface grayish-brown color and texture of a fine, sticky and plastic nature.
The Laguna de Santa Rosa is a 22-mile-long (35 km) wetland complex that drains a 254-square-mile (660 km 2) watershed encompassing most of the Santa Rosa Plain in Sonoma County, California, United States.
Pleasant Valley groundwater basin: 4-6 Medium 21,600 1,000 Arroyo Santa Rosa Valley groundwater basin: 4-7 Medium 3,740 1,200 950 Las Posas Valley groundwater basin: 4-8 Medium 42,200 750 Simi Valley groundwater basin: 4-9 12,100 394 Conejo Valley groundwater basin: 4-10 28,900 1,000 100 Coastal Plain of Los Angeles groundwater basin [5] 4-11 High
The upper soil surface above the Santa Rosa Plain is composed of Plio-Pleistocene alluvial fan deposits. Further north, one encounters Quaternary alluvium from the Russian River and its tributaries. North and east of Healdsburg, the Healdsburg fault cuts through Lower Cretaceous marine rocks with stringers of Mesozoic ultrabasic intrusive ...
Santa Rosa (Spanish for "Saint Rose") is a city in and the county seat of Sonoma County, in the North Bay region of the Bay Area in California. [10] Its population as of the 2020 census was 178,127. [8] It is the largest city in California's Wine Country and Redwood Coast.
It stretches from San Pablo Bay in the south to the city of Santa Rosa in the north. Sonoma Creek flows down the valley to the bay. The area includes the incorporated city of Sonoma and part of the city of Santa Rosa, as well as numerous unincorporated communities, including Kenwood and Glen Ellen near Santa Rosa and, near Sonoma, El Verano ...
The Oxnard Plain is a large coastal plain in southwest Ventura County, California, United States surrounded by the mountains of the Transverse Ranges.The cities of Oxnard, Camarillo, Port Hueneme and much of Ventura as well as the unincorporated communities of Hollywood Beach, El Rio, Saticoy, Silver Strand Beach, and Somis lie within the over 200-square-mile alluvial plain (520 km 2).