Complexities of the carters lake tmdl
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Complexities of the Carters Lake TMDL. 26th Annual Alabama Water Resources Conference September 6, 2012. Presented by: Jeremy Wyss, H.I.T. Tetra Tech. Carters Lake System. Headwaters of Coosa River. ≈520 Square Miles. Tallest Earthen Dam East of Mississippi River. ≈450 feet deep.

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Complexities of the Carters Lake TMDL

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Complexities of the carters lake tmdl

Complexities of the Carters Lake TMDL

  • 26th Annual Alabama Water Resources Conference

  • September 6, 2012

Presented by:

Jeremy Wyss, H.I.T.

Tetra Tech


Carters lake system

Carters Lake System

Headwaters of Coosa River

≈520 Square Miles

Tallest Earthen Dam East of Mississippi River

≈450 feet deep

USACE Peak Power Pump Storage Operation


Watershed standards

Watershed Standards

Coosawattee River at Georgia Highway 5 near Ellijay

  • TP – 151,500 pounds/year

Mountaintown Creek at State Road 282 (US Hwy 76) near Ellijay

  • TP – 8,000 pounds/year


Lake standards

Lake Standards

Whole Lake (Elevation 1072)

  • pH 6.0 – 9.5

  • TN 4.0 mg/L in photic zone

  • TP 172,500 lbs or 0.46 lb/acft

  • DO 5.0 mg/L (daily average) not less than 4 mg/L

Upper Lake - CoosawatteeRiver Embayment Mouth

  • Chlorophyll a 10 µg/L (growing season average)

Mid Lake - Upstream from Woodring Branch

  • Chlorophyll a 5 µg/L (growing season average)


Carters modeling

Carters Modeling

Models

Outputs

Carters

Watershed

Subwatershed Flows

Subwatershed Concentrations

(Chl-a, TN, NH3, NOx, OrgN, TP,

PO4, OrgP, BOD5, DO, Temp, TSS)

LSPC

Flows

Temperatures

Concentrations

Water Surface Elevation

Temperature and Dissolved Oxygen profiles

Lake Concentrations

(Chl-a, TN, NH3, NOx, OrgN, TP, PO4, OrgP, BOD5, DO, Temp)

Carters Lake

EFDC

Re-Reg

Lake

EFDC

Re-Reg Watershed

LSPC


Watershed hydrology calibration

Watershed Hydrology Calibration


Watershed water quality calibration

Watershed Water Quality Calibration


Lake hydrodynamics calibration

Lake Hydrodynamics Calibration


Lake water quality calibration

Lake Water Quality Calibration


Model scenarios

Model Scenarios

Baseline

  • Model Calibration

    Full Permit

  • Point Sources and Water withdrawals at full permit

    No Point Sources

  • Point Sources and Water withdrawals removed

    All Forest (natural)

  • All land use area converted to Forest

    Future Land use

  • Land use processed with GLUT 2040

    Reductions

  • Land use and point source % reductions


Tmdl status

TMDL Status

  • Modeling and scenario runs are completed (GAEPD reviewing)

  • GAEPD/EPA looking into standard modifications

    • Mountaintown Creek Total Phosphorus

    • Lake Total Nitrogen

    • Chlorophyll a

  • GAEPD looking into standard establishment

    • Talking Rock Creek

    • Reregulation Reservoir

  • Georgia Department of Natural Resources Board this fall


Next steps

Next Steps

  • Get TMDL approved

  • Incorporate modeling results into Georgia State Water Plan

  • Link Carters modeling to the GSWP Coosa River Basin model

    • Investigate impacts on Coosa and Lake Weiss TMDL’s


Complexities of the carters lake tmdl1

Complexities of the Carters Lake TMDL

Comments/Questions?

Acknowledgements

Dr. Elizabeth Booth, GAEPD


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