Surface Water & Groundwater Interactions Middle Reach of Russian River

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Presentation transcript:

Surface Water & Groundwater Interactions Middle Reach of Russian River Marcus Trotta, PG, CHg Water Agency Hydrogeologist marcus.trotta@scwa.ca.gov

Riverbank Filtration System Russian River Riverbank Filtration System One of the largest riverbank filtration systems in the world Treatment accomplished via natural filtration. Only chlorine added as a disinfectant 6 Collector Wells 7 Vertical Wells 5 Infiltration Ponds Inflatable Dam

Groundwater Movement Between Recharge and Discharge U.S. Geological Survey Circular 1139

Groundwater Basin Characteristics Unconfined alluvial aquifer filled with highly transmissive sands and gravels Hydraulically connected with Russian River Alluvial sediments Up to ~100 feet thick near River Bounded on West by low permeability Franciscan bedrock Bounded on East by older and less transmissive fluvial deposits (correlative with Glen Ellen Fm)

US Geological Survey Circular 1139 Gaining and Losing Streams Stream gains water from groundwater Stream loses water to groundwater Groundwater Mounds beneath the stream US Geological Survey Circular 1139

Assessment Techniques and Methods Temperature based streambed conductance estimates Water-Level measurements & vertical gradient analysis Seepage meters Surface and groundwater quality studies Riverbed sediment sampling program In-situ microsphere studies Geophysical Methods to Evaluate SW-GW Interactions Electrical Resistivity Spontaneous Potential

Measurement of Temperature to Characterize Surface and Groundwater Interactions Since 1998, SCWA/USGS have measured temperature trends of Russian River & shallow groundwater Estimate hydraulic conductivity & streambed conductance using VS2DH (USGS) Able to evaluate seasonal trends Cost-effective method Results compare favorably with seepage meters

Temperature data showing upward gradient Water level data showing upward gradient

Groundwater Flow Models

Questions/Discussion