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Watershed Impact Assessment in Chesapeake Bay: Isolating Geographic Influence

This study aims to understand which basins affect specific areas of Chesapeake Bay and by how much through isolation scenarios. Set criteria levels for Susquehanna and other watersheds, record changes in attainment, and analyze results. Results are provisional due to varying basin characteristics and size differences. Some rules apply for presentation and considerations for final model applications are noted.

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Watershed Impact Assessment in Chesapeake Bay: Isolating Geographic Influence

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Presentation Transcript

  1. Geographic Isolation Scenarios

  2. Purpose • Understand which basins affect which areas of the bay and by how much

  3. Procedure • Set the Susquehanna at Tier 3 loads and all other watersheds at 2000 levels • Record the relative change in attainment for each criterion and designated use area • Repeat for each basin

  4. Progress • All basins completed • Incorporated improvements in process • Results are provisional

  5. Why Still Provisional • Small changes difficult to compare to large changes • Different basins have different N:P:Sed ratios

  6. Presentation Rules • Do not show normalized results for Patuxent or ESVA. • Do not consider changes below a particular threshold to be significant • CL spring = 0.0011 • CL summer = 0.005 • KE = 0.0006

  7. Other Considerations • Final criteria curves not implemented • Final model applications areas not decided • Final designated use boundaries and clarity depths not decided

  8. Results • Problems (red areas) • Who has biggest impact • Who has biggest relative effectiveness

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