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Development of a Bay Health Index (BHI) for Chesapeake Bay, 2005

Development of a Bay Health Index (BHI) for Chesapeake Bay, 2005. Presented to TMAW by Michael Williams UMCES/CBPO 2 nd March, 2006. Chlorophyll-a. <50% segment area compliant. >50% segment area compliant. NOTE: Scale is 10x real Secchi depth to enhance interpolation. Non-compliant.

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Development of a Bay Health Index (BHI) for Chesapeake Bay, 2005

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  1. Development of a Bay Health Index (BHI) for Chesapeake Bay, 2005 Presented to TMAW by Michael Williams UMCES/CBPO 2nd March, 2006

  2. Chlorophyll-a

  3. <50% segment area compliant >50% segment area compliant

  4. NOTE: Scale is 10x real Secchi depth to enhance interpolation

  5. Non-compliant Compliant

  6. Dissolved Oxygen

  7. TENTATIVE REPRESENTATION Non-compliant Compliant

  8. Degraded Healthy

  9. Fixed (MD & VA) plus random samplings (MD only) in 2004 Degraded Healthy

  10. BHI based on Chl-a, DO, and Secchi Degraded Healthy

  11. BHI computed using BIBI and PIBI when available Degraded Healthy

  12. BHI including SAV EHI scale Degraded Healthy

  13. Bay Health Index(BHI) Regions Chesapeake Bay

  14. Regional BHI Summary

  15. Coastal Bays

  16. Ranked Regional BHI Summary

  17. Comments • Figure and summary table indicate that BHI in the mainstem is lowest in the mid and highest in the lower Bay • BHI for the major tributaries ranges from 24 to 69%. Generally, the ranking makes sense, although the Potomac seems anomalously high (reason: artifact of chl-a criteria?) • Recognize that SAV is the cumulative area of the single best year (02-04) expressed as a percent of the cumulative goal area

  18. Method’s Limitations • Not done on a percent area of the Bay • Combination of DO (depth integrated) with surface parameters • PIBI and BIBI have limited coverage; combination reduces method’s rigor • SAV coverage in excess of goal in some segments artificially bolsters success • Combination of years used to create index

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