Flow−normalized concentration

10

0

20

30

40

50

60

70

Number of samples in

excess of 20 per year

1985 1990 1995 2000 2005 2010

40,000

30,000

20,000

10,000

0

Flow−normalized flux

1.2

1.0

0.8

0.6

0.4

0.2

0

Concentration, in milligrams per liter

Flux, in kilograms per day

01646580 − Potomac River at Chain Bridge, MD (POTC) − Dissolved inorganic nitrogen

Water year

Trend estimated using baseline data

Trend estimated using “design guideline” subsamples (median)

Trend estimated using “design guideline” subsamples (range)

Excess annual sample counts

EXPLANATION
Flow−normalized concentration

10

0

20

30

40

50

60

70

Number of samples in

excess of 20 per year

1985 1990 1995 2000 2005 2010

8,000

6,000

4,000

2,000

0

Flow−normalized flux

1.2

1.0

0.8

0.6

0.4

0.2

0

Concentration, in milligrams per liter

Flux, in kilograms per day

01646580 − Potomac River at Chain Bridge, MD (POTC) − Total phosphorus

Water year

Trend estimated using baseline data

Trend estimated using “design guideline” subsamples (median)

Trend estimated using “design guideline” subsamples (range)

Excess annual sample counts

EXPLANATION
Flow−normalized concentration

2

0

4

6

8

10

12

14

Number of samples in

excess of 20 per year

1985 1990 1995 2000 2005 2010

7,000,000

6,000,000

5,000,000

4,000,000

3,000,000

2,000,000

1,000,000

0

Flow−normalized flux

70

60

50

40

30

20

10

0

Concentration, in milligrams per liter

Flux, in kilograms per day

01646580 − Potomac River at Chain Bridge, MD (POTC) − Sediment

Water year

Trend estimated using baseline data

Trend estimated using “design guideline” subsamples (median)

Trend estimated using “design guideline” subsamples (range)

Excess annual sample counts

EXPLANATION
Flow−normalized concentration

1985 1990 1995 2000 2005 2010

35,000

30,000

25,000

20,000

15,000

10,000

5,000

0

Flow−normalized flux

0.6

0.4

0.2

0

10

0

20

30

40

50

60

Number of samples in

excess of 20 per year

Concentration, in milligrams per liter

Flux, in kilograms per day

01540500 − Susquehanna River at Danville, PA (SRDA) − Dissolved inorganic oxygen

Water year

Trend estimated using baseline data

Trend estimated using “design guideline” subsamples (median)

Trend estimated using “design guideline” subsamples (range)

Excess annual sample counts

EXPLANATION
Flow−normalized concentration

1985 1990 1995 2000 2005 2010

6,000

4,000

2,000

0

Flow−normalized flux

0.12

0.10

0.08

0.06

0.04

0.02

0

10

0

20

30

40

50

60

Number of samples in

excess of 20 per year

Concentration, in milligrams per liter

Flux, in kilograms per day

01540500 − Susquehanna River at Danville, PA (SRDA) − Total phosphorus

Water year

Trend estimated using baseline data

Trend estimated using “design guideline” subsamples (median)

Trend estimated using “design guideline” subsamples (range)

Excess annual sample counts

EXPLANATION
Flow−normalized concentration

10

0

20

30

40

50

60

Number of samples in

excess of 20 per year

1985 1990 1995 2000 2005 2010

6,000,000

4,000,000

2,000,000

0

Flow−normalized flux

50

40

30

20

10

0

Concentration, in milligrams per liter

Flux, in kilograms per day

01540500 − Susquehanna River at Danville, PA (SRDA) − Sediment

Water year

Trend estimated using baseline data

Trend estimated using “design guideline” subsamples (median)

Trend estimated using “design guideline” subsamples (range)

Excess annual sample counts

EXPLANATION
Flow−normalized concentration

10

0

20

30

40

50

60

Number of samples in

excess of 20 per year

1990 1995 2000 2005 2010

120,000

100,000

80,000

60,000

40,000

20,000

0

Flow−normalized flux

1.0

0.8

0.6

0.4

0.2

0

Concentration, in milligrams per liter

Flux, in kilograms per day

01576000 − Susquehanna River at Marietta, PA (SRMA) − Dissolved inorganic nitrogen

Water year

Trend estimated using baseline data

Trend estimated using “design guideline” subsamples (median)

Trend estimated using “design guideline” subsamples (range)

Excess annual sample counts

EXPLANATION
Flow−normalized concentration

10

0

20

30

40

50

60

Number of samples in

excess of 20 per year

1990 1995 2000 2005 2010

14,000

12,000

10,000

8,000

6,000

4,000

2,000

0

Flow−normalized flux

0.08

0.06

0.04

0.02

0

Concentration, in milligrams per liter

Flux, in kilograms per day

01576000 − Susquehanna River at Marietta, PA (SRMA) − Total phosphorus

Water year

Trend estimated using baseline data

Trend estimated using “design guideline” subsamples (median)

Trend estimated using “design guideline” subsamples (range)

Excess annual sample counts

EXPLANATION
Flow−normalized concentration

10

0

20

30

40

50

60

Number of samples in

excess of 20 per year

1990 1995 2000 2005 2010

14,000,000

12,000,000

10,000,000

8,000,000

6,000,000

4,000,000

2,000,000

0

Flow−normalized flux

50

40

30

20

10

0

Concentration, in milligrams per liter

Flux, in kilograms per day

01576000 − Susquehanna River at Marietta, PA (SRMA) − Sediment

Water year

Trend estimated using baseline data

Trend estimated using “design guideline” subsamples (median)

Trend estimated using “design guideline” subsamples (range)

Excess annual sample counts

EXPLANATION
Flow−normalized concentration

10

0

20

30

40

50

60

Number of samples in

excess of 20 per year

1985 1990 1995 2000 2005 2010

20,000

15,000

10,000

5,000

0

Flow−normalized flux

0.6

0.4

0.2

0

Concentration, in milligrams per liter

Flux, in kilograms per day 01553500 − West Branch Susquehanna River at Lewisburg, PA (WBSL) − Dissolved inorganic nitrogen

Water year

Trend estimated using baseline data

Trend estimated using “design guideline” subsamples (median)

Trend estimated using “design guideline” subsamples (range)

Excess annual sample counts

EXPLANATION
Flow−normalized concentration

10

0

20

30

40

50

60

Number of samples in

excess of 20 per year

1985 1990 1995 2000 2005 2010

2,500

2,000

1,500

1,000

500

0

Flow−normalized flux

0.08

0.06

0.04

0.02

0

Concentration, in milligrams per liter

Flux, in kilograms per day

01553500 − West Branch Susquehanna River at Lewisburg, PA (WBSL) − Total phoshorus

Water year

Trend estimated using baseline data

Trend estimated using “design guideline” subsamples (median)

Trend estimated using “design guideline” subsamples (range)

Excess annual sample counts

EXPLANATION
Flow−normalized concentration

10

0

20

30

40

50

60

Number of samples in

excess of 20 per year

1985 1990 1995 2000 2005 2010

2,500,000

2,000,000

1,500,000

1,000,000

500,000

0

Flow−normalized flux

25

20

15

10

5

0

Concentration, in milligrams per liter

Flux, in kilograms per day

01553500 − West Branch Susquehanna River at Lewisburg, PA (WBSL) − Sediment

Water year

Trend estimated using baseline data

Trend estimated using “design guideline” subsamples (median)

Trend estimated using “design guideline” subsamples (range)

Excess annual sample counts

EXPLANATION
Flow−normalized concentration

10

0

20

30

40

50

60

Number of samples in

excess of 20 per year

1985 1990 1995 2000 2005 2010

12,000

10,000

8,000

6,000

4,000

2,000

0

Flow−normalized flux

8

6

4

2

0

Concentration, in milligrams per liter

Flux, in kilograms per day

01576754 − Conestoga River at Conestoga, PA (CONE) − Dissolved inorganic nitrogen

Water year

Trend estimated using baseline data

Trend estimated using “design guideline” subsamples (median)

Trend estimated using “design guideline” subsamples (range)

Excess annual sample counts

EXPLANATION
Flow−normalized concentration

1985 1990 1995 2000 2005 2010

1,500

1,000

500

0

Flow−normalized flux

0.6

0.5

0.4

0.3

0.2

0.1

0

Concentration, in milligrams per liter Flux, in kilograms per day

01576754 − Conestoga River at Conestoga, PA (CONE) − Total phosphorus

Water year

Trend estimated using baseline data

Trend estimated using “design guideline” subsamples (median)

Trend estimated using “design guideline” subsamples (range)

Excess annual sample counts

EXPLANATION

10

0

20

30

40

50

60

Number of samples in

excess of 20 per year
Flow−normalized concentration

10

0

20

30

40

50

Number of samples in

excess of 20 per year

1985 1990 1995 2000 2005 2010

1,000,000

800,000

600,000

400,000

200,000

0

Flow−normalized flux

100

80

60

40

20

0

Concentration, in milligrams per liter

Flux, in kilograms per day

01576754 − Conestoga River at Conestoga, PA (CONE) − Sediment

Water year

Trend estimated using baseline data

Trend estimated using “design guideline” subsamples (median)

Trend estimated using “design guideline” subsamples (range)

Excess annual sample counts

EXPLANATION
Flow−normalized concentration

10

0

20

30

40

50

Number of samples in

excess of 20 per year

1985 1990 1995 2000 2005 2010

140,000

120,000

100,000

80,000

60,000

40,000

20,000

0

Flow−normalized flux

1.2

1.0

0.8

0.6

0.4

0.2

0

Concentration, in milligrams per liter

Flux, in kilograms per day

01578310 − Susquehanna River at Conowingo, MD (SRCW) − Dissolved inorganic nitrogen

Water year

Trend estimated using baseline data

Trend estimated using “design guideline” subsamples (median)

Trend estimated using “design guideline” subsamples (range)

Excess annual sample counts

EXPLANATION
Flow−normalized concentration

10

0

20

30

40

50

Number of samples in

excess of 20 per year

1985 1990 1995 2000 2005 2010

10,000

8,000

6,000

4,000

2,000

0

Flow−normalized flux

0.06

0.05

0.04

0.03

0.02

0.01

0

Concentration, in milligrams per liter

Flux, in kilograms per day

01578310 − Susquehanna River at Conowingo, MD (SRCW) − Total phosphorus

Water year

Trend estimated using baseline data

Trend estimated using “design guideline” subsamples (median)

Trend estimated using “design guideline” subsamples (range)

Excess annual sample counts

EXPLANATION
Flow−normalized concentration

10

0

20

30

40

50

Number of samples in

excess of 20 per year

1985 1990 1995 2000 2005 2010

8,000,000

6,000,000

4,000,000

2,000,000

0

Flow−normalized flux

20

15

10

5

0

Concentration, in milligrams per liter

Flux, in kilograms per day

01578310 − Susquehanna River at Conowingo, MD (SRCW) − Sediment

Water year

Trend estimated using baseline data

Trend estimated using “design guideline” subsamples (median)

Trend estimated using “design guideline” subsamples (range)

Excess annual sample counts

EXPLANATION
Flow−normalized concentration

10

0

20

30

Number of samples in

excess of 20 per year

1985 1990 1995 2000 2005 2010

600

500

400

300

200

100

0

Flow−normalized flux

0.20

0.15

0.10

0.5

0

Concentration, in milligrams per liter Flux, in kilograms per day

02041650 − Appomattox River at Matoaca, VA (APPM) − Dissolved inorganic nitrogen

Water year

Trend estimated using baseline data

Trend estimated using “design guideline” subsamples (median)

Trend estimated using “design guideline” subsamples (range)

Excess annual sample counts

EXPLANATION
Flow−normalized concentration

10

0

20

30

Number of samples in

excess of 20 per year

1985 1990 1995 2000 2005 2010

150

100

50

0

Flow−normalized flux

0.05

0.04

0.03

0.02

0.01

0

Concentration, in milligrams per liter

Flux, in kilograms per day

02041650 − Appomattox River at Matoaca, VA (APPM) − Total phosphorus

Water year

Trend estimated using baseline data

Trend estimated using “design guideline” subsamples (median)

Trend estimated using “design guideline” subsamples (range)

Excess annual sample counts

EXPLANATION
Flow−normalized concentration

1985 1990 1995 2000 2005 2010

50,000

40,000

30,000

20,000

10,000

0

Flow−normalized flux

10

8

6

4

2

0

10

0

20

30

Number of samples in

excess of 20 per year

Concentration, in milligrams per liter

Flux, in kilograms per day

02041650 − Appomattox River at Matoaca, VA (APPM) − Sediment

Water year

Trend estimated using baseline data

Trend estimated using “design guideline” subsamples (median)

Trend estimated using “design guideline” subsamples (range)

Excess annual sample counts

EXPLANATION
Flow−normalized concentration

10

0

20

30

40

Number of samples in

excess of 20 per year

1985 1990 1995 2000 2005 2010

Flow−normalized flux

0.15

0.10

0.05

0

Concentration, in milligrams per liter Flux, in kilograms per day 01674500 − Mattaponi River near Beulahville, VA (MABU) − Dissolved inorganic nitrogen

Water year

Trend estimated using baseline data

Trend estimated using “design guideline” subsamples (median)

Trend estimated using “design guideline” subsamples (range)

Excess annual sample counts

EXPLANATION

200

150

100

50

0
Flow−normalized concentration

10

0

20

30

40

Number of samples in

excess of 20 per year

1985 1990 1995 2000 2005 2010

Flow−normalized flux

0.06

0.05

0.04

0.03

0.02

0.01

0

Concentration, in milligrams per liter Flux, in kilograms per day

01674500 − Mattaponi River near Beulahville, VA (MABU) − Total phosphorus

Water year

Trend estimated using baseline data

Trend estimated using “design guideline” subsamples (median)

Trend estimated using “design guideline” subsamples (range)

Excess annual sample counts

EXPLANATION

80

60

40

20

0
Flow−normalized concentration

1985 1990 1995 2000 2005 2010

Flow−normalized flux

12

10

8

6

4

2

0

Concentration, in milligrams per liter

Flux, in kilograms per day

01674500 − Mattaponi River near Beulahville, VA (MABU) − Sediment

Water year

Trend estimated using baseline data

Trend estimated using “design guideline” subsamples (median)

Trend estimated using “design guideline” subsamples (range)

Excess annual sample counts

EXPLANATION

25,000

20,000

15,000

10,000

5,000

0

10

0

20

30

40

Number of samples in

excess of 20 per year