Bay Water Quality Responses to Simulated Nutrient and Sediment Load Reductions:
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Bay Water Quality Responses to Simulated Nutrient and Sediment Load Reductions: Findings and Recommendations Presentation VIII-A. CBP Principals’ Staff Committee Meeting Lancaster, Pa. April 30, 2010. Bob Koroncai Lewis Linker USEPA. Presentation Preview.

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Bay Water Quality Responses to Simulated Nutrient and Sediment Load Reductions: Findings and RecommendationsPresentation VIII-A

CBP Principals’ Staff Committee Meeting

Lancaster, Pa.

April 30, 2010

Bob Koroncai

Lewis Linker

USEPA


Presentation preview
Presentation Preview Sediment Load Reductions:

  • Nutrients: Dissolved Oxygen and Chlorophyll ‘a’ Criteria Attainment

    • Past decisions

    • Current model results

    • Next steps toward full attainment: decision

  • Sediment: Clarity and SAV Attainment

    • Current model results

    • Next steps towards full attainment: decision


Remember in october 2009 the psc agreed to a basin wide target loads of
Remember, in October 2009 the PSC agreed to a basin-wide target loads of…

15 mpy

Phosphorus

200 mpy

Nitrogen


PSC Told in October The Recommended Basinwide Loads Will Change Due to…

  • Updated critical period

  • Upgraded watershed model (Phase 5.2 to 5.3)

  • Filter feeder inclusion in the WQ model

  • Atmospheric deposition allocation and impact on ocean load

  • Modified assessment procedures for Bay criteria

  • SAV/clarity target load analysis

  • Trade-offs between N and P

  • Loading reductions needed to meet local Bay segments


DO Stoplight Plot Summary Information Change Due to…

Violation Count >1% for the ’93-’95 Critical Period


DO Non-attainment – All Scenarios Change Due to…

Violation counts based on >1% for the ’93-’95 critical period


Deep-Channel Use Dissolved Oxygen at Current Target Loads Change Due to…

(200 TN, 15 TP+ 15.7 air allocation)

  • Non-attainment in 3 segments (>1%)

    • CB4 (2%)

    • Lower Chester (14%)

    • Eastern Bay (4%)

  • 1 segment at <1%

  • Reaching attainment will require further reductions in nutrient loads from larger Bay watershed


Deep-Water Use Dissolved Oxygen at Current Target Loads Change Due to…

(200 TN, 15 TP+ 15.7 air allocation)

  • Non-attainment in 2 segments (>1%)

    • Lower Chester River (3%)

    • Magothy (16%)

  • 4 segments at <1%

  • Reaching attainment will require further reductions in nutrient loads from basinwide and local watershed scales


Open-Water Use Dissolved Oxygen at Current Target Loads Change Due to…

(200 TN, 15 TP+ 15.7 air allocation)

  • Non-attainment in 15 segments (>1%), ex:

    • Pocomoke (25%)

    • Anacostia (16%)

    • Wicomico (15%)

    • Severn (6%)

    • Lower York (3%)

  • 8 segments at <1%

  • Reaching attainment will require further reductions in nutrient loads from local watershed scales


Dissolved oxygen chlorophyll where do we go from here
Dissolved oxygen/chlorophyll: Change Due to…where do we go from here?

  • Identify loads to achieve full attainment

    • Identify non-attaining segments

    • For each non-attaining segment:

      • Identify watershed(s) having the most influence on tidal water quality

      • Identify loadings needed to fully attain

      • Understand any other factors contributing to sustained non-attainment (beyond E3)

  • PSC agreement with this approach?


What about sediment
What about sediment? Change Due to…


Clarity/SAV Non-attainment Change Due to…

Violation counts based on >1% for the ’93-’95 critical period


Clarity sav where do we go from here
Clarity/SAV: Change Due to…where do we go from here?

  • Confirm assessment procedures fully consistent with states’ WQ standards regulations

  • Identify loads to achieve full attainment

    • Identify non-attaining segments

    • For each non-attaining segment:

      • Diagnosis major contributor(s) to reduce water clarity: nutrient, sediments

      • Identify watershed(s) having the most influence on tidal water quality

      • Identify loadings needed to fully attain

      • Understand any other factors contributing to sustained non-attainment (beyond E3)

  • PSC agreement with this approach?


When? Change Due to…

  • State/basin nutrient allocations by July 1

  • State/basin sediment allocations by August 15


Nutrient and sediment summary
Nutrient and Sediment Summary Change Due to…

  • Need to refine state/basin nutrient allocations by meeting WQS in ‘local’ segments

  • Much sediment attainment achieved with P controls planned

  • Need to commit to extensive review in June (N/P) and July/August (S)


Questions
Questions? Change Due to…


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