(appendix d is divided into 4 parts) part 4 · 2018. 4. 5. · appendix d . water quality program...

Appendix D

Water Quality Program

(Appendix D is divided into 4 parts)

Part 4 Long Lake, McDonald Lake, Lake Olson, Rest Area Pond, Silver Lake,

Sunfish Lake, Sunnybrook Lake (Lake graphs and map of survey results)

Part 1 2012 VBWD Water Quality Data Collection Program

(Narration, Tables D-1 through D-6, Figure D-1 [Avg. water clarity depths], and Figures D-2 and D-3 [Biotic Index Values])

Part 2

Bay Lake, Cloverdale Lake, Lake DeMontreville, Downs Lake, Eagle Point Lake, Echo Lake, Lake Edith

(Lake graphs and map of survey results)

Part 3

Lake Elmo, Goose Lake (North), Goose Lake (South), Horseshoe Lake, Lake Jane, Klawitter Pond, Kramer Pond

(Lake graphs and map of survey results)

Part 4 Long Lake, McDonald Lake, Lake Olson, Rest Area Pond, Silver Lake,

Sunfish Lake, Sunnybrook Lake

(Lake graphs and map of survey results)

LONG LAKESUMMER AVERAGE WATER CLARITY

Valley Branch Watershed District

0

2

4

6

8

10

12

14

16

18

0

1

2

3

4

5

6

1970

1975

1980

1985

1990

1995

2000

2005

2010

2015

Secc

hi D

isc

Tran

spar

ency

Dep

th (f

eet)

Secc

hi D

isc

Tran

spar

ency

Dep

th (m

eter

s)

Year

POOR

EXCELLENT

FAIR

GOOD

LONG LAKE HISTORIC WATER QUALITY DATA Valley Branch Watershed District

LONG LAKE HISTORIC WATER QUALITY DATA Valley Branch Watershed District

Mann-Kendall/Sen’s Slope Trend Test (Test Period – 2003 to 2012)

Confidence

Level Test Statistic = 16

Test Significance 99% 16 < 25 Not Significant 95% 16 < 20 Not Significant 90% 16 < 17 Not Significant 80% 16 > 14 Significant (Increasing)

Sen’s Slope 0.279 meters/year

Notes: 1. Points shown in the graph are the summer average (June-August) Secchi disc transparency depths. Only years with a calculated summer average based on at least 4 measured values are plotted. At least 5 data points were required to complete the trend test.

LONG LAKE

MANN-KENDALL TREND ANALYSIS OF SECCHI DISC TRANSPARENCY Valley Branch Watershed District

MC DONALD LAKESUMMER AVERAGE WATER CLARITY

Valley Branch Watershed District

0

1

2

3

4

5

6

7

8

9

0

1

2

3

1990

1995

2000

2005

2010

2015

Secc

hi D

isc

Tran

spar

ency

Dep

th (f

eet)

Secc

hi D

isc

Tran

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ency

Dep

th (m

eter

s)

Year

POOR

EXCELLENT

FAIR

GOOD

MC DONALD LAKE HISTORIC WATER QUALITY DATA Valley Branch Watershed District

MC DONALD LAKE HISTORIC WATER QUALITY DATA Valley Branch Watershed District

Mann-Kendall/Sen’s Slope Trend Test (Test Period – 2003 to 2012)

Confidence

Level Test Statistic = -8

Test Significance 99% -8 > -25 Not Significant 95% -8 > -20 Not Significant 90% -8 > -17 Not Significant 80% -8 > -14 Not Significant

Sen’s Slope -0.032 meters/year

Notes: 1. Points shown in the graph are the summer average (June-August) Secchi disc transparency depths. Only years with a calculated summer average based on at least 4 measured values are plotted. At least 5 data points were required to complete the trend test.

LAKE MCDONALD MANN-KENDALL TREND ANALYSIS OF SECCHI DISC TRANSPARENCY Valley Branch Watershed District

LAKE OLSONSUMMER AVERAGE WATER CLARITY

Valley Branch Watershed District

0

2

4

6

8

10

12

0

1

2

3

4

1970

1975

1980

1985

1990

1995

2000

2005

2010

2015

Secc

hi D

isc

Tran

spar

ency

Dep

th (f

eet)

Secc

hi D

isc

Tran

spar

ency

Dep

th (m

eter

s)

Year

POOR

EXCELLENT

FAIR

GOOD

LAKE OLSON HISTORIC WATER QUALITY DATA Valley Branch Watershed District

LAKE OLSON

HISTORIC WATER QUALITY DATA Valley Branch Watershed District

Mann-Kendall/Sen’s Slope Trend Test (Test Period = 2004 to 2012)

Confidence

Level Test Statistic = 3

Test Significance 99% 3 < 21 Not Significant 95% 3 < 17 Not Significant90% 3 < 15 Not Significant80% 3 < 12 Not Significant

Sen’s Slope 0.013 meters/year

Notes: 1. Points shown in the graph are the summer average (June-August) Secchi disc transparency depths. Only years with a calculated summer average based on at least 4 measured values are plotted. At least 5 data points were required to complete the trend test.

LAKE OLSON

MANN-KENDALL TREND ANALYSIS OF SECCHI DISC TRANSPARENCY Valley Branch Watershed District

REST AREA PONDSUMMER AVERAGE WATER CLARITY

Valley Branch Watershed District

0

1

2

3

4

5

6

7

8

9

0

1

2

3

1985

1990

1995

2000

2005

2010

2015

Secc

hi D

isc

Tran

spar

ency

Dep

th (f

eet)

Secc

hi D

isc

Tran

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ency

Dep

th (m

eter

s)

Year

POOR

EXCELLENT

FAIR

GOOD

REST AREA POND HISTORIC WATER QUALITY DATA Valley Branch Watershed District

REST AREA POND HISTORIC WATER QUALITY DATA Valley Branch Watershed District

Mann-Kendall/Sen’s Slope Trend Test (Test Period – 2003 to 2012)

Confidence

Level Test Statistic = -9

Test Significance 99% -9 > -21 Not Significant 95% -9 > -17 Not Significant 90% -9 > -15 Not Significant 80% -9 > -12 Not Significant

Sen’s Slope -0.039 meters/year

Notes: 1. Points shown in the graph are the summer average (June-August) Secchi disc transparency depths. Only years with a calculated summer average based on at least 4 measured values are plotted. At least 5 data points were required to complete the trend test.

REST AREA POND

MANN-KENDALL TREND ANALYSIS OF SECCHI DISC TRANSPARENCY Valley Branch Watershed District

SILVER LAKESUMMER AVERAGE WATER CLARITY

Valley Branch Watershed District

0

2

4

6

8

10

12

0

1

2

3

4

1970

1975

1980

1985

1990

1995

2000

2005

2010

2015

Secc

hi D

isc

Tran

spar

ency

Dep

th (f

eet)

Secc

hi D

isc

Tran

spar

ency

Dep

th (m

eter

s)

Year

POOR

EXCELLENT

FAIR

GOOD

Significant Trend 2003-2012 -0.191 meters (-0.63 feet) / year

SILVER LAKE HISTORIC WATER QUALITY DATA Valley Branch Watershed District

SILVER LAKE HISTORIC WATER QUALITY DATA Valley Branch Watershed District

Mann-Kendall/Sen’s Slope Trend Test (Test Period – 2003 to 2012)

Confidence

Level Test Statistic = -31

Test Significance 99% -31 < -30 Significant (Declining) 95% -31 < -23 Significant (Declining) 90% -31 < -20 Significant (Declining) 80% -31 < -16 Significant (Declining)

Sen’s Slope -0.191 meters/year

Notes: 1. Points shown in the graph are the summer average (June-August) Secchi disc transparency depths. Only years with a calculated summer average based on at least 4 measured values are plotted. At least 5 data points were required to complete the trend test.

SILVER LAKE

MANN-KENDALL TREND ANALYSIS OF SECCHI DISC TRANSPARENCY Valley Branch Watershed District

SUNFISH LAKESUMMER AVERAGE WATER CLARITY

Valley Branch Watershed District

0

1

2

3

4

5

6

7

8

9

0

1

2

3

1975

1980

1985

1990

1995

2000

2005

2010

2015

Secc

hi D

isc

Tran

spar

ency

Dep

th (f

eet)

Secc

hi D

isc

Tran

spar

ency

Dep

th (m

eter

s)

Year

POOR

EXCELLENT

FAIR

GOOD

SUNFISH LAKE HISTORIC WATER QUALITY DATA Valley Branch Watershed District

SUNFISH LAKE HISTORIC WATER QUALITY DATA Valley Branch Watershed District

Mann-Kendall/Sen’s Slope Trend Test (Test Period – 2005 to 2012)

Confidence

Level Test Statistic = 9

Test Significance 99% 9 < 18 Not Significant 95% 9 < 15 Not Significant 90% 9 < 13 Not Significant 80% 9 < 10 Not Significant

Sen’s Slope 0.01 meters/year

Notes: 1. Points shown in the graph are the summer average (June-August) Secchi disc transparency depths. Only years with a calculated summer average based on at least 4 measured values are plotted. At least 5 data points were required to complete the trend test.

SUNFISH LAKE

MANN-KENDALL TREND ANALYSIS OF SECCHI DISC TRANSPARENCY Valley Branch Watershed District

!?

!?

Typha sp.

Sagittaria sp.

Nymphaea odorata

Nymphaea odorata

Phragmites australis

Carex sp.

Sagittaria sp.

Sagittaria sp.

Schoenoplectus tabernaemontani

Schoenoplectus fluviatilis

Typha sp.

Chara sp. - 3+

Ceratophyllum demersum - 1

Stuckenia pectinatus - 1-3

Potamogeton zosteriformis - 1-2

Potamogeton crispus - 1

Potamogeton sp. - 2-3

Chara sp. - 2+

Potamogeton zosteriformis - 3+

Stuckenia pectinatus - 1-2

Ceratophyllum demersum - 1

Myriophyllum sibiricum - 1-2

Najas sp. - 1

Eriocaulon sp. - 1

Sagittaria sp. - 1-2

Stuckenia pectinatus - 1-3

Potamogeton zosteriformis - 3+

Ceratophyllum demersum - 1

Myriophyllum sibiricum - 1-2

Chara sp. - 2-3+

Potamogeton sp. - 2-3

Potamogeton crispus - 1-2

Elodea canadensis - 1

Potamogeton crispus - 1-2

Chara sp. - 1-2

Ceratophyllum demersum - 1

Stuckenia pectinatus - 1

Potamogeton zosteriformis - 2-3+

Myriophyllum sibiricum - 1-3

Potamogeton sp. - 2-3

Potamogeton crispus - 1

Chara sp. - 3+

Stuckenia pectinatus - 2-3

Potamogeton zosteriformis - 2-3

Myriophyllum sibiricum - 1

Potamogeton sp. - 2-3

Potamogeton zosteriformis - 3+

Potamogeton crispus - 2-3+

Elodea canadensis - 1

Potamogeton sp. - 3+

Potamogeton

zosteriformis - 3

Typha sp.

Scirpus sp.

South Basin

North Basin

Water QualityMonitoring Location

Typha sp.

Chara sp. - 2-3+

Schoenoplectus tabernaemontani

Schoenoplectus

tabernaemontani

Typha sp.

Potamogeton crispus - 1-2

Schoenoplectus tabernaemontani

Potamogeton crispus - 1-2Chara sp. - 3+

Potamogeton zosteriformis - 2-3

Water QualityMonitoring Location

Potamogeton crispus - 1-3

Elodea canadensis - 1

Chara sp. - 3+

Potamogeton zosteriformis - 2-3

Potamogeton sp. - 1-2

Scirpus sp.

Nymphaea odorata

Ranunculus

longirostris - 1

Phragmites australis

Potamogeton crispus - 2-3+

Elodea canadensis

Scirpus sp.

Potamogeton crispus - 1-3

Potamogeton crispus - 2-3

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Imagery Source: 2009 AE

SUNFISH LAKE MACROPHYTESURVEY RESULTS

June 4, 2012Valley Branch Watershed District

FIELD NOTES:- Macrophyte densities estimated as follows: 1=light; 2=moderate; 3=heavy- Densities generally not noted for emergent and floating leaf plants- No macrophytes found in water >6-7’ - Sporadic areas of Sagitarria sp. growing around entire lake perimeter. Dense in small areas.- Northwest lobe dry. No aquatic vegetation.- Most growth observed in 0-4’ depth- High water level

Emergent Plants

Floating Leaf Plants

Submerged Aquatic Plants

No Aquatic Vegetation

!? Water Quality Monitoring Location

Ke

vin

Av

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Hwy 5

!;N

0 200 400

Meters

0 500 1,000

Feet

*Note: Bold red name indicates extremely aggressive/invasive introduced species.

Common Name Scientific Name

Canada w aterw eed Elodea canadensis

Coontail Ceratophyllum demersum

Curlyleaf pondweed Potamogeton crispus

Flatstem pondw eed Potamogeton zosteriformis

Muskgrass Chara sp.

Northern w atermilfoil Myriophyllum sibiricum

Pipew ort Eriocaulon sp.

Pondw eed Potamogeton sp.

Sago pondw eed Stuckenia pectinatus

Slender naiad Najas sp.

White w ater crow foot Ranunculus longirostris

Common Name Scientific Name

White w aterlily Nymphaea tuberosa

Common Name Scientific Name

Sedge Carex sp.

Giant reed grass Phragmites australis

Water knotw eed Polygonum amphibium

Arrow head Sagittaria sp.

River bulrush Schoenoplectus fluviatilis

Softstem bulrush Schoenoplectus tabernaemontani

Cattail Typha sp.

Bulrush Scirpus sp.

Submerged Aquatic Plants

Floating Leaf Plants

Emergent Plants

SUNNYBROOK LAKESUMMER AVERAGE WATER CLARITY AND TREND

Valley Branch Watershed District

0

1

2

3

4

5

6

7

8

9

0

1

2

3

1985

1990

1995

2000

2005

2010

2015

Secc

hi D

isc

Tran

spar

ency

Dep

th (f

eet)

Secc

hi D

isc

Tran

spar

ency

Dep

th (m

eter

s)

Year

POOR

EXCELLENT

FAIR

GOOD

SUNNYBROOK LAKE HISTORIC WATER QUALITY DATA Valley Branch Watershed District

SUNNYBROOK LAKE HISTORIC WATER QUALITY DATA Valley Branch Watershed District

Mann-Kendall/Sen’s Slope Trend Test (Test Period – 2003 to 2012)

Confidence

Level Test Statistic = 22

Test Significance 99% 22 < 30 Not Significant 95% 22 < 23 Not Significant 90% 22 > 20 Significant (Increasing) 80% 22 > 16 Significant (Increasing)

Sen’s Slope 0.057 meters/year

Notes: 1. Points shown in the graph are the summer average (June-August) Secchi disc transparency depths. Only years with a calculated summer average based on at least 4 measured values are plotted. At least 5 data points were required to complete the trend test.

SUNNYBROOK LAKE

MANN-KENDALL TREND ANALYSIS OF SECCHI DISC TRANSPARENCY Valley Branch Watershed District