San Francisco Estuary Institute Small Tributaries Loading Study Zone 4 Line A Sources Pathways and Loadings Workgroup May 6 th 2010 Rand Eads RiverMetrics.

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Presentation transcript:

San Francisco Estuary Institute Small Tributaries Loading Study Zone 4 Line A Sources Pathways and Loadings Workgroup May 6 th 2010 Rand Eads RiverMetrics LLC Item #3c Alicia Gilbreath SFEI

San Francisco Estuary Institute Item #3c

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

Flow-Sediment Summary UnitsHY07HY08HY09HY10 Seasondays Q peak > 50cfs Q peak > 100cfs52216 Q peak > 150cfs2117 Q totcfs44,56911,83161,29299,204 Q maxcfs Turbidity maxNTU Rainfallin SSC samplescount SSC maxmg/L2,7441,050478NA SS loadkg84,96233,61443,726NA San Francisco Estuary Institute Item #3c

San Francisco Estuary Institute Item #3c

San Francisco Estuary Institute Item #3c

Flow -Turbidity - Sediment Characteristics 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 San Francisco Estuary Institute Item #3c

Sample Inventory Item #3c San Francisco Estuary Institute HgT HgD, MeHgT, MeHgD HgR910 PCBs PBDEs20858 OC Pesticides, PAHs788 Pyrethroids8 Se – T,D,(IV),(VI),Me10 Trace Elements (Cu) Fe1610 SSC Nutrients12 DOC, POC161314

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

Item #3c Rainfall data downloaded from Western Regional Climate Center ( San Francisco Estuary Institute

Item #3c Loads HgT (g) Cu (kg) t-PCBs (g) Long-term Avg Long-term Avg Long-term Avg

San Francisco Estuary Institute Item #3c

San Francisco Estuary Institute Item #3c

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

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

What We Don’t Know Item #3c 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

Acknowledgements Item #3c 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

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

San Francisco Estuary Institute Item #3c FWMC