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Nontidal Indicators for the Chesapeake Bay

Nontidal Indicators for the Chesapeake Bay. Steve Preston Troy A. Keller Chesapeake Bay Program May 11, 2005. Indicators for Nontidal Number of different indicators metrics have been created to track nontidal systems: Flow Trend estimates (N, P, and Sediment)

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Nontidal Indicators for the Chesapeake Bay

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  1. Nontidal Indicators for the Chesapeake Bay Steve Preston Troy A. Keller Chesapeake Bay Program May 11, 2005

  2. Indicators for Nontidal • Number of different indicators metrics have been created to track nontidal systems: • Flow • Trend estimates (N, P, and Sediment) • • Loads (N, P, Sediment) • Others?

  3. Flow Indicator

  4. N Trend Indicator

  5. P Trend Indicator

  6. Sediment Trend Indicator

  7. N Load Indicator

  8. P Load Indicator

  9. Sediment Load Indicator

  10. Proposed Alternative • Estimate total load to the Chesapeake Bay using a combined modeling and measured approach: • River Input Monitoring Program (RIMP) estimates • • Hydrologic Simulation Program Fortran (HSPF)

  11. Approach • Idealized watershed model to indicate major loading categories: Fall Line Above Fall Line Bay Below Fall Line

  12. External Load Sources Atm on Bay Measured Modeled AFL point source BFL point source RIMP Bay AFL nonpoint source BFL nonpoint source

  13. Load Estimate

  14. Below Fall Line - NPS • Estimate below fall line loads from nonpoint sources using a ratio approach:

  15. Variables

  16. N Load Estimates

  17. P Load Estimates

  18. Sediment Load Estimates

  19. Mock Indicator Data

  20. Discussion Topics • Questions arising about data • Is this load estimate method acceptable? • How should we estimate loads for years without HSPF model runs? • What is the best way to estimate point source loads for non model years?

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