Maryland Coastal Bays...Department of the Environment Maryland Coastal Bays: TMDL Development Update...
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Department of the Environment Maryland Coastal Bays: TMDL Development Update Timothy C. Rule Maryland Department of the Environment January 5, 2011
Transcript of Maryland Coastal Bays...Department of the Environment Maryland Coastal Bays: TMDL Development Update...
Department of the Environment
Maryland Coastal Bays: TMDL Development Update
Timothy C. Rule
Maryland Department of the Environment
January 5, 2011
Presentation Outline
•
Schedule and Status of TMDL Development
•
Modeling Approach—Brief Review
•
Accomplishments During 2010
•
Impairments and TMDLs
in Coastal Bays—Recap
•
Water Quality Standards and TMDL Modeling Endpoints for Coastal Bays TMDLs
•
Scenario Runs
•
Q&A and Discussion
TMDL Development Schedule and Status
•
Watershed Model: Baseline Loads Delivered to VIMS: January
•
Water Quality Model:–
Final Calibration: February 2011
–
Scenario Runs: March –
April 2011
•
TMDL Documentation: January –
April 2011
•
TMDL Review: May –
August 2011–
Includes Public Review and Meeting (late July)
•
Submittal to EPA: September 2011
MDE’s
Modeling Approach•
Linked modeling system –
Watershed Model (HSPF)
•
University of Maryland•
Complete; transferred to MDE
–
Major updates/improvements in last year
–
Hydrodynamic Model/Water Quality Model (UnTRIM/CE-
QUAL-ICM) •
Virginia Institute of Marine Sciences
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Includes sediment process component
Land Use
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Delaware (Inland Bays model)••
Delaware Department of Planning Land Use Database.Delaware Department of Planning Land Use Database.
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Maryland••
Worcester County Land Use databaseWorcester County Land Use database
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Virginia••
National Land Cover Data (USGS, 1999)National Land Cover Data (USGS, 1999)
••
CBPO land use classification used for agricultural CBPO land use classification used for agricultural categoriescategories
Presenter
Presentation Notes
Methodology to process Worcester County Land Use Data into HSPF model categories file Lndcvr04_DRAFT_1_29_09.gdb was converted into a shape file using Arc-Map 9.3 a field called “HSPF_ID” was added to the attribute table The shape file Lndcvr04_DRAFT_1_29_09.shp was intersected with the watershed model segmentation The proportions of the HSPF land use categories in the Maryland Coastal Bays were calculated; note that the category of water has not been included in the calculation of proportions and the areas corresponding to “chicken houses” has been added to the LIDI category. The percentage of impervious areas is the sum of HIDI plus LIDI (5%) while the proportion of urban pervious areas is the sum of HIDP plus LIDP (11%)
Watershed Model Segmentation
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Calibration of Model Parameters (Birch Branch)
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Validation (Bassett Creek)
•
Transfer of Model Parameters to Uncalibrated
Segments
Presenter
Presentation Notes
Correct typo in Birch Branch WATERSHED Add a box in power point…. To show the cut out Remove name on the right
Improvements to WSM over the last year:
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Full Review and QA/QC of Land Use/Acreages
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Review and Refinement of Automated Calibration Methods
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Refinement of Parameter Transfer Methodology •
Verification of Consistency with Literature Values
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Improvement of Barren Land Unit Loads
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Addition of Shoreline Erosion
Presenter
Presentation Notes
Initial conditions
Impairments Under Investigation•
1996: All Coastal Bays listed as impaired by nutrients.
•
Existing TMDLs
(2002):–
(1) Newport Bay–
(2) Areas of Isle of Wight Bay (aka “Northern Coastal Bays”)
•
Current project addresses entire system:–
Areas addressed by previous TMDLs–
Assawoman
Bay (including Greys
Creek and Open Water)–
Isle of Wight Bay (Manklin
Creek and Open Water)–
Sinepuxent
Bay –
Newport Bay (Marshall Creek)–
Chincoteague Bay
Presenter
Presentation Notes
In your opening, establish the relevancy of the topic to the audience. Give a brief preview of the presentation and establish value for the listeners. Take into account your audience’s interest and expertise in the topic when choosing your vocabulary, examples, and illustrations. Focus on the importance of the topic to your audience, and you will have more attentive listeners.
Location of Existing TMDLs
Designated Uses, Criteria, and
TMDL Endpoints
Designated Uses in Coastal Bays
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Use I: Water Contact Recreation/Protection of Aquatic Life
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Use II: Support of Estuarine and Marine Aquatic Life and Shellfish Harvesting
Water Quality Criteria in Coastal Bays
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Dissolved Oxygen:–
Numeric
Criteria
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MD: ≥
5 mg/l DO at any time
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VA: 5mg/L min/ 6mg/L daily average DO
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DE: 5mg/L daily average DO
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Chlorophyll a:–
Narrative
Criteria
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In MD: Chlorophyll a concentrations in free-floating microscopic plants (i.e., algae) must not exceed levels that result in ecologically undesirable consequences
TMDL/Modeling Endpoints•
Must be protective of Designated Uses per Code of Maryland Regulations
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Seek to protect SAV grow zones
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Discussions w/MCBP staff led to consideration of chlorophyll a endpoints in context of salinity regimes
Salinity Regimes in Coastal Bays
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Proposed Chlorophyll a endpoints:–
Polyhaline
areas: 90th
%ile
not to exceed 15 μg/L
–
Oligohaline: Not to exceed 50 μg/L
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Will consider results of Natural Conditions modeling scenario
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Mesohaline: Will depend on results of Natural Conditions modeling scenario
Modeling Scenarios:•
20 budgeted for; ≥
13 already dedicated
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Current (Baseline) Conditions
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Natural Conditions•
Natural land use, no anthropogenic inputs
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Includes shoreline erosion
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Incremental Loading Scenarios (4)
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Geographic Isolation and Existing TMDL Scenarios (6)
Geographic Isolation/Existing TMDL Scenarios
Modeling Scenarios (Cont’d)•
TMDL Scenarios (Several)
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Stakeholder-suggested scenarios (many encompassed above):–
Geographic Isolation of Chincoteague Island–
‘All or Nothing’
of the following:•
N-removing septic systems•
CAFOs•
Atmospheric Deposition•
OC WWTP Outfall•
Impervious Surfaces•
Cover Crops
•
Post-TMDL Development Scenarios Also Possible
TMDL Development Schedule—Recap
•
Modeling: January –
April 2011
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TMDL Documentation: January –
April 2011
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TMDL Review: May –
August 2011•
Mark your calendars: Public meeting mid-late July
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Submittal to EPA: September 2011
Discussion/Questions?
Contact InformationMelissa Chatham
TMDL Technical Development Program, MDE/SSA
1800 Washington Blvd., Ste. 540
Baltimore, MD 21230
(410) 537-3937
Tim Rule
TMDL Technical Development Program, MDE/SSA
1800 Washington Blvd., Ste. 540
Baltimore, MD 21230
(410) 537-3688
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