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Geographic Isolation Scenarios

Geographic Isolation Scenarios. Purpose. Understand which basins affect which areas of the bay and by how much. 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

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Geographic Isolation Scenarios

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  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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