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San Lorenzo Valley Water District Gets Information on Groundwater Levels and Goals



2020-06-05 11:58:33 News & Society

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With the rainy season behind us, the focus of San Lorenzo Valley Water District is now on future groundwater levels as we head into the drier summer months.

Boulder Creek, CA, May 19, 2020 — With the rainy season behind us, the focus of San Lorenzo Valley Water District is now on future groundwater levels as we head into the drier summer months.

For the District groundwater is the primary source of drinking water for residents from June through October when surface water flow is low during drier months. Rainfall is the main source of recharge to the basin and surface water flows. The groundwater basin is shared by users, including the District, Scotts Valley Water District (SVWD), and Mount Hermon Association, as well as local businesses and residents using private wells.

The Santa Margarita Groundwater Agency (SMGWA) at its Board of Directors meeting in April held an informational session that centered on groundwater levels and the agency’s goals for future groundwater levels. The District is one of three member-agencies that make up the SMGWA, along with the SVWD and the County of Santa Cruz.

The session examined the Santa Margarita Basin and its four primary aquifers: Santa Margarita aquifer, Monterey formation, Lompico aquifer and Butano aquifer. The session identified the unique characteristics of each aquifer and its particular set of users.

• The aquifer closest to the surface is the Santa Margarita. It is about 100 feet thick, on average, and is the most vulnerable to fluctuations in climate conditions. That means it recharges the fastest during periods of rainfall, but also depletes the most quickly during dry times or when lots of pumping occurs. The District and most private well owners draw water from this aquifer.

•The next aquifer down is the Monterey formation, which is not a true aquifer and a very few wells pump from it. It is a clay layer found in limited areas of the basin.

•The third layer down, the Lompico aquifer, is a main source of supply for local water districts. It is generally found around depths of 500-700 feet below the surface.

•Finally, the Butano aquifer is deepest and occurs at around 1,000 feet below the surface of the valley floor. Currently, only the Scotts Valley Water District extracts water from this aquifer.

The aquifers aren’t evenly deposited throughout the basin, according to Georgina King of Montgomery & Associates, who gave the presentation to the SMGWA. Rather, the underground bowl-shaped basin supports varying levels and depths of each aquifer in different areas. The deeper layers are exposed to the land surface in the upgradient of hillsides, which are the principal recharge zone for these aquifers.

Evaluating groundwater levels is one of the state-required elements of the Sustainable Management Criteria (SMC) in the Groundwater Sustainability Plan (GSP). As a required element of the GSP, the SMGWA board must set minimum thresholds for groundwater levels in the basin as well as measurable objectives to ensure the basin’s sustainability. The board provided input on the significant and unreasonable conditions that will be used to develop a draft qualitative statement for board review.

The SMGWA’s board meeting was held April 23, included time for public comment and participation on each agenda item, and was conducted via all-remote, web- and phone-based access due to the Santa Cruz County Shelter-in-Place Order response to the coronavirus outbreak.

If you are interested in learning more about the SMGWA or the District’s involvement visit www.https://smgwa.org/. The next SMGWA Board of Directors meeting will be held on May 28th at 5:30 p.m. The meeting Agenda and any supplementary materials will be made available www.https://smgwa.org/ as they are generated by staff. Due to the circumstances regarding the ongoing shelter-in-place orders all Agency meetings will be held in an exclusively remote-access format until further notice.


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Salinas, CA 93901
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