www.sonomacountywater.org/svgroundwater

2011 Progress

2012 Plans

• Implemented Public Outreach Plan: updated web site (www.sonomacountywater.org/svgroundwater).

• The Basin Advisory Panel met quarterly to implement the groundwater management program.

• The Technical Advisory Committee met monthly to provide technical advice on the groundwater management program.

• Conducted local technical presentations and briefings. • Sponsored public meetings on the Stormwater

Management/Groundwater Recharge Scoping Study.

VOLUNTEER GROUNDWATER LEVEL MONITORING PUBLIC OUTREACH & STAKEHOLDER INVOLVEMENT • Installed two multi-depth wells with a $250K grant. • 8 additional wells were added to the program in 2011,

bringing the total number of voluntary wells to 141. • DWR, VOMWD, the City of Sonoma, SCWA and local

trained volunteers coordinated the semi-annual measurement of water levels from these 141 wells.

• Developed work plan for the California Statewide Groundwater Elevation Monitoring Program.

• Prepared and distributed the 2010 Annual Report.

GROUNDWATER QUALITY PROTECTION

• Distributed and publicized the “Slow It, Spread It, Sink It” guidebook as a resource for property owners to implement stormwater retention and groundwater recharge projects.

• Conducted efforts to pursue funding for additional groundwater monitoring and conservation projects.

RECHARGE A PRIORITY Provided input on two recharge studies: • Stormwater Management/Groundwater Recharge

Scoping Study in Sonoma Valley • Groundwater Banking Program Feasibility Study in

Sonoma Valley IMPROVE GROUNDWATER SUSTAINABILITY CONSERVATION REDUCES GROUNDWATER USE

• Continued the SVGMP Annual Conservation Awards with nominations.

• Completed the report on domestic and agriculture water savings assessments under a grant.

• Continued outreach to distribute Well Owners Guide. • Conducted additional groundwater quality sampling and

analysis in southern Sonoma Valley for salinity. • Assembled and compiled additional Department of Public

Health groundwater data on wells in the valley.

ANNUAL RAINFALL/SURFACE WATER CONDITIONS

PUBLIC OUTREACH & STAKEHOLDER INVOLVEMENT

2011 Progress Continues on the Basin Management Objectives

• Participate in the development of a salt and nutrient management plan for Sonoma Valley.

• Conduct additional water quality sampling to assess source of salinity in southern Sonoma Valley.

GROUNDWATER CONDITIONS

GROUNDWATER MONITORING PROGRAM

GROUNDWATER QUALITY PROTECTION

• Complete the two groundwater recharge studies: o Stormwater Management/Groundwater Recharge

Scoping Study in Sonoma Valley o Groundwater Banking Program Feasibility Study in

Sonoma Valley • Initiate preparation of a stormwater

management/groundwater recharge feasibility study. • Initiate preparation of a groundwater banking pilot study. • Conduct seepage runs in Sonoma Creek and tributaries to

study interaction of surface water and groundwater. • Upgrade existing hydrogeologic conceptual model and

groundwater flow model.

GROUNDWATER SUSTAINABILITY • Continue BAP and TAC meetings, prepare media outreach

materials and conduct stakeholder briefings.

• Annual rainfall was approximately 123% of average in 2010 (36 1/2 inches at the City’s rain gage compared with the 50-year average of 29.5), and represented an improvement in conditions over the previous three straight years of below average rainfall.

• Annual discharge of Sonoma Creek measured at the USGS Agua Caliente gage was approximately 100% of average in 2010 (51,870 acre-feet compared with the average of 51,839 acre-feet).

• 2010 groundwater level trends observed in shallow-zone wells (<200-feet) are generally stable and groundwater level declines are more pervasive and pronounced in deeper-zone wells (> 200 feet).

• Two previously identified, deeper zone groundwater depressions remain evident – southeast of the City of Sonoma and Southwest of El Verano. Groundwater levels are locally below sea level in these areas.

• Expand Voluntary Groundwater-Level Monitoring. • Continue multi-agency coordination on ground water

monitoring and submit CASGEM data annually.

Hydrologic/Groundwater Conditions in Sonoma Valley

2012 Goals and Planned Activities

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