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Assessment of Small Tributaries in San Francisco Estuary: Pathways and Loadings Study

This study by the San Francisco Estuary Institute investigates small tributaries, focusing on their pathways and loadings in Zone 4, line A. The findings reveal key insights into flow-sediment relationships, turbidity, and contaminant levels. It highlights the short-duration hydrographs' response to rainfall and explores sediment characteristics during storm events. Essential data on mercury and PCB levels indicate significant variability. Acknowledgments include contributions from various labs and agencies. This report is vital for understanding tributary impacts on estuarine ecology.

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Assessment of Small Tributaries in San Francisco Estuary: Pathways and Loadings Study

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  1. Item #3c San Francisco Estuary Institute Small Tributaries Loading Study Zone 4 Line A Sources Pathways and Loadings Workgroup May 6th 2010 Alicia Gilbreath SFEI Rand Eads RiverMetrics LLC www.rivermetrics.com rivermetrics@gmail.com 503-435-7516

  2. Item #3c San Francisco Estuary Institute

  3. San Francisco Estuary Institute Item #3c Years sampled so far

  4. San Francisco Estuary Institute Item #3c Flow-Sediment Summary

  5. San Francisco Estuary Institute Item #3c

  6. San Francisco Estuary Institute Item #3c

  7. San Francisco Estuary Institute Item #3c Flow -Turbidity - SedimentCharacteristics • Rapid response to rainfall • Duration of hydrograph is short • Poor relation between flow and sediment • Phase and amplitude of flow and turbidity peaks often different • Turbidity-SSC relation is good to excellent • Storm-wise SSC loads slight improvement over annual loads • Storms with multiple flow peaks often have declining turbidity peaks

  8. Sample Inventory Item #3c San Francisco Estuary Institute

  9. San Francisco Estuary Institute Item #3c • HgT range (n=76*): 1.4 – 113 ng/L • * only samples during times the turbidity was recorded are reported.

  10. San Francisco Estuary Institute Item #3c • t-PCB range (n=43*): 332 – 52,375 pg/L • * only samples during times turbidity was recorded are reported.

  11. San Francisco Estuary Institute Item #3c Rainfall data downloaded from Western Regional Climate Center (www.wrcc.dri.edu)

  12. San Francisco Estuary Institute Loads Item #3c Long-term Avg 2007 Long-term Avg Long-term Avg 2009 2007 2007 2009 2009 HgT (g) t-PCBs (g) Cu (kg)

  13. San Francisco Estuary Institute Item #3c

  14. San Francisco Estuary Institute Item #3c

  15. Side-by-side Automated Hg Sampling San Francisco Estuary Institute Item #3c RPD = 54% 11.6% 0.8% 3.8% 3.3%

  16. Automated PCB Sampling San Francisco Estuary Institute Item #3c RPD = 54% 11.6% 0.8% 3.8% 3.3%

  17. Item #3c What We Don’t Know • Upper end of discharge rating only 1 measurement above 135 cfs • Low flow discharge & turbidity spikes unrelated to rainfall • Contaminant-turbidity relationship at higher turbidity • Not sampled a wet year with high intensity rainfall

  18. Item #3c Acknowledgements Labs: MLML Axys Analytical Brooks Rand Romberg-Tiburon Center for Environmental Studies Site Access and Rainfall Data: Alameda County Flood Control and Water Conservation District

  19. San Francisco Estuary Institute Loads: Area-normalized Item #3c

  20. San Francisco Estuary Institute FWMC Item #3c

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