1 / 10

Modeling Copper Runoff in San Francisco Bay Area Watersheds

Modeling Copper Runoff in San Francisco Bay Area Watersheds. Jim Carleton US EPA. BPP Technical Studies. Air Deposition Monitoring (SFEI). Representative Sample of Brake Pad Wear Debris (BMC/Link Test Labs). Air Deposition Modeling (AER). Physical & Chemical Characterization of

zubin
Download Presentation

Modeling Copper Runoff in San Francisco Bay Area Watersheds

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Modeling Copper Runoff in San Francisco Bay Area Watersheds Jim Carleton US EPA

  2. BPP Technical Studies Air Deposition Monitoring (SFEI) Representative Sample of Brake Pad Wear Debris (BMC/Link Test Labs) Air Deposition Modeling (AER) Physical& Chemical Characterization of Wear Debris (Clemson University) Copper Source Loading Estimates (Process Profiles) Watershed Modeling(U.S. EPA) Water Quality Monitoring (ACCWP) Bay Modeling (URS) Final Report Data Assessment Conclusions Steering Committee, Scientific Advisory Team, and Stakeholder Involvement Process (Sustainable Conservation)

  3. Copper Build-up on Impervious Surfaces

  4. Geometric mean 140 mg/kg Soil background 25 mg/kg Copper on Suspended Sediment in Bay Area Streams

  5. Key Questions for Watershed Modeling • What are deposition rates of copper on pervious and impervious surfaces in the San Francisco Bay area? • How much of the deposited copper comes from brake pads? • How much of the copper that is deposited on pervious surfaces ends up transported to streams (and the bay) in runoff?

  6. Watershed Modeling with HSPF • Castro Valley watershed model used to estimate build-up and washoff parameters. • First calibrate stream flow using local precipitation data as input. • Next calibrate suspended sediment and copper against monitoring data. • Using build-up/washoff parameters from Castro model, run simulation of greater Bay area (multi-watershed) to estimate total loads to Bay.

  7. Bay Area Watersheds Castro Valley watershed Guadalupe River watershed

  8. Castro Valley HSPF Initial Calibration Using annualized loadings from initial air deposition monitoring

  9. Guadalupe River HSPF Initial Validation Using annualized loadings from initial air deposition monitoring

  10. Future Activities • Incorporation of modeled source loadings, and will need to look at: • Importance of suspended sediment (which is hard to model) • Uncertainties in apportioning pervious and impervious land loadings to copper in stream water column • Sensitivity of model results to choice of model parameters • Approaches • Calibration using current data • Checking against historical data • Staying within literature ranges of parameters • Best professional judgment

More Related