complexities of the carters lake tmdl

Complexities of the Carters Lake TMDL

Presented by:

Jeremy Wyss, H.I.T.Tetra Tech

26th Annual Alabama Water Resources ConferenceSeptember 6, 2012

USACE Peak Power Pump Storage Operation

≈450 feet deep

Carters Lake - EFDC Lake Model GridBottom Elevations (feet)

NAD_1983_UTM_Zone_17NMap produced 10-27-2011 - P. Cada

LegendStream/River

Water

County Boundary

EFDC Model Grid

Reregulation Lake Bottom Elev. (ft)

High : 677

Low : 655

Carters Lake Bottom Elev. (ft)

High : 1040

Low : 697

0 1 20.5 Miles

0 1 20.5 Kilometers

CartersReregulationReservoir

CartersLake

CoosawatteeRiver

TalisCreek

TalkingRockCreek

CartersDam

ReregulationDam

Tallest Earthen Dam East of Mississippi River

≈520 Square Miles

Carters Lake WatershedNAD_1983_UTM_Zone_17N

Map produced 10-27-2011 - P. Cada

Gilmer County

Fannin County

Pickens County

Murray County

Dawson County

Gordon County

Bartow CountyCherokee County

LegendStream/River

Water

County Boundary

Carters Lake Watershed

0 6 123 Miles

0 6 123 Kilometers


CartersLake

CoosawatteeRiver

Headwaters of Coosa River

Carters Lake Watershed - Location MapNAD_1983_UTM_Zone_17N


AllatoonaLake

Chattah

oochee

River

Flint R

iver

FL

SC

AL

NCTN

Apal

achi

cola

Rive

r

Oconee River

Altamaha River

SatillaRiver

Ocmulgee River

Savannah River

LakeJackson

LakeSinclair

LakeOconee

Coosa River

LegendMajor WaterwayWaterCarters Lake Watershed

Carters Lake Watershed Elevations (meters)

High : 1232

Low : 206

0 40 8020 Miles

0 40 8020 Kilometers

LakeSidneyLanier

WestPointLake

J. StromThurmond

Lake

Walter F.George

Reservoir

LakeBlackshear

LakeSeminole

LakeHartwell

BrunswickHarbor

Carters Lake System

Carters Lake Watershed - Water Quality Calib. StationsNAD_1983_UTM_Zone_17N


14119901

14119981

14119261

14119251

14116001

14115001

14114301

14114201

1411410114114031

14114001

14109931

14109901

14079011

14075511

14070001

1406490114063901

1405682114056701

14056501

14056401

14056301

14056901

LegendWater Quality Calib. Station

Stream/River

Water

Model Subwatersheds

County Boundary

0 4 82 Miles

0 4 82 Kilometers


CartersLake

Year

Coosawattee River at Georgia

Highway 5 near Ellijay

Mountaintown Creek at State Road

282 (US Hwy 76) near

EllijayRegulatory Limit

(lb/year) 151,500 8,000

2002 93,036 2,734

2003 106,622 10,029

2004 173,748 7,006

2005 248,493 27,383

2006 85,358 5,704

2007 127,577 2,714

2008 127,595 4,698

2009 265,948 19,658

• TP – 8,000 pounds/year

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

• TP – 151,500 pounds/year

Coosawattee River at Georgia Highway 5 near Ellijay

Watershed Standards

2002 2003 2004 2005 2006 2007 2008 2009 20100.0

5.0

10.0

15.0

20.0

25.0

Carters Lake Growing Season Average Chlorophyll a

Carters MidlakeCarters CoosawatteeStandard

Year

Chlo

roph

yll a

(ug/

L)

Carters LakeModel Calibration Stations

NAD_1983_UTM_Zone_17NMap produced 10-27-2011 - P. Cada

14119601

14119401

14119301

Water SurfaceElevation Station(USGS)

Water SurfaceElevation Station(USACE)

LegendWater Surface Elev. Station

GAEPD Compliance Station

Stream/River

Water

County Boundary

EFDC Model Grid

0 1 20.5 Miles

0 1 20.5 Kilometers


CartersLake

CoosawatteeRiver

TalisCreek

TalkingRockCreek

CartersDam

ReregulationDam

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

Mid Lake - Upstream from Woodring Branch

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

Upper Lake - Coosawattee River Embayment Mouth

• 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

Whole Lake (Elevation 1072)

Lake Standards

Carters ModelingModels Outputs

Water Surface ElevationTemperature and Dissolved Oxygen profilesLake Concentrations(Chl-a, TN, NH3, NOx, OrgN, TP, PO4, OrgP, BOD5, DO, Temp)

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

EFDC

FlowsTemperaturesConcentrations

CartersWatershe

d

Carters Lake

LSPC

LSPC

Re-RegLake

Re-Reg Watershe

d

EFDC

Watershed Hydrology Calibration

0

500

1000

1500

J-98 J-99 J-01 J-02 J-04 J-05 J-07 J-08

Month

Flow

(cfs

)

0

2

4

6

8

10

12

14

Mon

thly

Rai

nfal

l (in

.)

Avg Monthly Rainfall (in.)Avg Observed Flow (1/1/1998 to 12/31/2009 )Avg Modeled Flow (Same Period)

0100020003000400050006000700080009000

Jan-98 Jul-99 Jan-01 Jul-02 Jan-04 Jul-05 Jan-07 Jul-08

0

2

4

6

8

10

12

14

10

100

1000

10000

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

Percent of Time that Flow is Equaled or Exceeded

Dai

ly A

vera

ge F

low

(cfs

)

Observed Flow Duration (1/1/1998 to 12/31/2009 )

Modeled Flow Duration (1/1/1998 to 12/31/2009 )

J F M A M J J A S O N D

0

200

400

600

800

1 2 3 4 5 6 7 8 9 10 11 12

Month

Flow

(cfs

)

0

1

2

3

4

5

6

Mon

thly

Rai

nfal

l (in

.)

Average Monthly Rainfall (in) Observed (25th, 75th)Median Observed Flow (1/1/1998 to 12/31/2009) Modeled (Median, 25th, 75th)

10

100

1000

10000

0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

Dai

ly A

vera

ge F

low

(cfs

)

Observed Flow Duration (1/1/1998 to 12/31/2009 )

Modeled Flow Duration (1/1/1998 to 12/31/2009 )

0%

20%

40%

60%

80%

100%

120%

Jan-98 Jul-99 Jan-01 Jul-02 Jan-04 Jul-05 Jan-07 Jul-08

Nor

mal

ized

Flo

w V

olum

e (O

bser

ved

as 1

00%

)

Observed Flow Volume (1/1/1998 to 12/31/2009 )

Modeled Flow Volume (1/1/1998 to 12/31/2009 )

Watershed Water Quality Calibration

0

5

10

15

20

25

30

Jan1998

Jan1999

Jan2000

Jan2001

Jan2002

Jan2003

Jan2004

Jan2005

Jan2006

Jan2007

Jan2008

Jan2009

TEM

P (°

C)

0

1

2

3

4

5

6

7

8

9

Pre

cipi

tatio

n (in

/day

)

Modeled (Reach 1001) Observed (14109901) Precipitation

0

2

4

6

8

10

12

14

16

18

Jan1998

Jan1999

Jan2000

Jan2001

Jan2002

Jan2003

Jan2004

Jan2005

Jan2006

Jan2007

Jan2008

Jan2009

DO

(mg/

l)

0

1

2

3

4

5

6

7

8

9

Pre

cipi

tatio

n (in

/day

)


0

1

2

3

4

5

6

7

8

9

Jan1998

Jan1999

Jan2000

Jan2001

Jan2002

Jan2003

Jan2004

Jan2005

Jan2006

Jan2007

Jan2008

Jan2009

Tota

l Nitr

ogen

(mg/

l)

0

1

2

3

4

5

6

7

8

9

Pre

cipi

tatio

n (in

/day

)


0

0.5

1

1.5

2

2.5

Jan1998

Jan1999

Jan2000

Jan2001

Jan2002

Jan2003

Jan2004

Jan2005

Jan2006

Jan2007

Jan2008

Jan2009

Tota

l Pho

spho

rus

(mg/

l)

0

1

2

3

4

5

6

7

8

9

Pre

cipi

tatio

n (in

/day

)


0

1

2

3

4

5

6

7

8

9

Jan1998

Jan1999

Jan2000

Jan2001

Jan2002

Jan2003

Jan2004

Jan2005

Jan2006

Jan2007

Jan2008

Jan2009

Tota

l Nitr

ogen

(mg/

l)

0

1

2

3

4

5

6

7

8

9

Pre

cipi

tatio

n (in

/day

)


0

0.5

1

1.5

2

2.5

Jan1998

Jan1999

Jan2000

Jan2001

Jan2002

Jan2003

Jan2004

Jan2005

Jan2006

Jan2007

Jan2008

Jan2009

Tota

l Pho

spho

rus

(mg/

l)

0

1

2

3

4

5

6

7

8

9

Pre

cipi

tatio

n (in

/day

)


0

5

10

15

20

25

30

Jan1998

Jan1999

Jan2000

Jan2001

Jan2002

Jan2003

Jan2004

Jan2005

Jan2006

Jan2007

Jan2008

Jan2009

TEM

P (°

C)

0

1

2

3

4

5

6

7

8

9

Pre

cipi

tatio

n (in

/day

)


0

2

4

6

8

10

12

14

16

18

Jan1998

Jan1999

Jan2000

Jan2001

Jan2002

Jan2003

Jan2004

Jan2005

Jan2006

Jan2007

Jan2008

Jan2009

DO

(mg/

l)

0

1

2

3

4

5

6

7

8

9

Pre

cipi

tatio

n (in

/day

)


Lake Hydrodynamics Calibration

GAEPD

2009 Carters Lake

Profiles

Station 14119301

Temperature (°C)

Dep

th(ft

)0 10 20 30

0

20

40

60

80

100

120

140

160

180

200

MeasuredSimulated

4/28/2009

Temperature (°C)

Dep

th(ft

)

0 10 20 30

0

20

40

60

80

100

120

140

160

180

200

MeasuredSimulated

5/6/2009

Temperature (°C)

Dep

th(ft

)

0 10 20 30

0

20

40

60

80

100

120

140

160

180

200

MeasuredSimulated

6/3/2009

Temperature (°C)

Dep

th(ft

)

0 10 20 30

0

20

40

60

80

100

120

140

160

180

200

MeasuredSimulated

7/8/2009

Temperature (°C)

Dep

th(ft

)

0 10 20 30

0

20

40

60

80

100

120

140

160

180

200

MeasuredSimulated

8/5/2009

Temperature (°C)

Dep

th(ft

)

0 10 20 30

0

20

40

60

80

100

120

140

160

180

200

MeasuredSimulated

9/9/2009

Temperature (°C)

Dep

th(ft

)

0 10 20 30

0

20

40

60

80

100

120

140

160

180

200

MeasuredSimulated

10/7/2009

GAEPD

2004 Carters Lake

Profiles

Station 14119301

Temperature (°C)

Dep

th(ft

)

0 10 20 30

0

20

40

60

80

100

120

140

160

180

200

MeasuredSimulated

4/27/2004

Temperature (°C)

Dep

th(ft

)

0 10 20 30

0

20

40

60

80

100

120

140

160

180

200

MeasuredSimulated

5/25/2004

Temperature (°C)

Dep

th(ft

)

0 10 20 30

0

20

40

60

80

100

120

140

160

180

200

MeasuredSimulated

6/23/2004

Temperature (°C)

Dep

th(ft

)

0 10 20 30

0

20

40

60

80

100

120

140

160

180

200

MeasuredSimulated

7/28/2004

Temperature (°C)

Dep

th(ft

)

0 10 20 30

0

20

40

60

80

100

120

140

160

180

200

MeasuredSimulated

8/25/2004

Temperature (°C)

Dep

th(ft

)

0 10 20 30

0

20

40

60

80

100

120

140

160

180

200

MeasuredSimulated

9/24/2004

Temperature (°C)

Dep

th(ft

)

0 10 20 30

0

20

40

60

80

100

120

140

160

180

200

MeasuredSimulated

10/26/2004

Lake Water Quality Calibration

Model ScenariosBaseline 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

0 1 2 3 4 5 6 7 8 9 100.0

2.0

4.0

6.0

8.0

10.0

12.0

14.0

16.0

18.0

20.0

Carters Lake at Upper Lake Station

Baseline Permit PS_Removed Forest 2040 40% Ag Reduction Standard

Year

Chl

orop

hyll-

a (u

g/l)

0 1 2 3 4 5 6 7 8 9 100.0

2.0

4.0

6.0

8.0

10.0

12.0

14.0

16.0

18.0

20.0

Carters Lake at Mid Lake Station

Baseline Permit PS_Removed Forest 2040 40% Ag Reduction Standard

Year

Chl

orop

hyll-

a (u

g/l)

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 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

Comments/Questions?

Complexities of the Carters Lake TMDL

AcknowledgementsDr. Elizabeth Booth, GAEPD

complexities of the carters lake tmdl

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