Relating Water Quality to Catchment Characteristics in the Tahoe … · 2019-07-24 · Relating...

36
Relating Water Quality to Catchment Characteristics in the Tahoe Basin: A TMDL Progress Report

Transcript of Relating Water Quality to Catchment Characteristics in the Tahoe … · 2019-07-24 · Relating...

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Relating Water Quality to Catchment Characteristics in the

Tahoe Basin:A TMDL Progress Report

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Relationships between turbidity and TP, 1999-2001 snowmelt periods. Open circles for Ward Cr.; filled circles for Blackwood Cr. (Stubblefield

et al. 2004)

0

50

100

150

200

250

300

0 10 20 30 40 50

Tota

l Pho

spho

rus

(ppb

)

Turbidity (ntu)

R2=0.62

R2=0.83

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Average Annual Nitrogen Yield by Watershed, 1990-2001

0.0

0.5

1.0

1.5

2.0

2.5

BlackwoodEdgewood

GeneralGlenbro

okInclin

eLoganhouse

Trout

ThirdU. T

ruckeeWardN

itro

gen

Yie

ld, k

g/h

a/yr

NH4-N

NO3-N

TKN

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Average Annual Phosphorus Yield, 1990-2001

0.00.20.40.60.81.01.2

Blackwood

EdgewoodGen

eralGlenbro

okIncli

neLogan

houseTro

utThird

U. Tru

ckee

Ward

P Y

ield

, kg/

ha/

yr

TPSRP

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Mean Annual Suspended Sediment Yield, 1990-2001

0.00.20.40.60.81.01.21.41.61.8

Blackwood

EdgewoodGen

eralGlenbro

okIncli

neLogan

houseTro

utThird

U. Tru

ckee

WardS

us.

Sed

., T/

ha/

yr

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Nitrogen Yield from LTIMP Watersheds

0

0.5

1

1.5

2

2.5

3

1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001

N Y

ield

, kg

/ha/

yr NH4-N

NO3-NTKN

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Phosphorus Yield from LTIMP Watersheds

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001

P Y

ield

, kg

/ha/

yr

TPSRP

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Suspended Sediment Yield from LTIMP Watersheds

0

0.5

1

1.5

2

2.5

1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001Su

spen

de

Sed

imen

t, T

/ha/

yr

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WATER QUALITY CONSTITUENT NH4-N NO3-N TKN SRP TP SS

Basis MR PCA/MR MR MR PCA/MR PCA/MR

R2 0.70 0.61 0.88 0.60 0.65 0.40 Area - + + Mean Ann. Precip. + + - + River Density + + Riparian Rivers + + - + Alluvial Rivers + + - - Pct. Volcanic - - - Pct. Granitic + - - - Wtd. Slope + + Soil Index - - - - - Turf - - Pct. Imp., C/I + Pct. Imp., non-Hiwy + + + + + Pct. Imp., Hiway + Dirt Roads - + Dirt Roads X Precip + +

Regression of Constituent Loads (kg/ha/yr) vs.Watershed Characteristics

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5>���1� 2$?�5>���1� 2$?�

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45$5��!�(2$5� 4�1� 45$5��!�(2$5� 4�1�

215�!2�B �21215�!2�B �21

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=25!�12 �=25!�12 �

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Total Kjedahl N Loads, SWM Sites, 2003 WY

0.0

0.5

1.0

1.5

AD BB CI DC DD IR MD NW O3 RB SB SQ SY

Site

Mea

sure

d L

oad

, kg

/ha

Wet SeasonThunderstorms

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Total P Loads, SWM Sites, 2003 WY

0.000.100.200.300.400.500.600.70

AD BB CI DC DD IR MD NW O3 RB SB SQ SY

Site

Mea

sure

d L

oad

, kg

/ha

Wet SeasonThunderstorms

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010203040506070

Snowmelt:Rising Limb

Snowmelt:Falling Limb

Snowmelt:Falling Limb

Tail

Tot

al N

itrat

e L

oadi

ng (k

g N

)

Incline CreekSki Area

0

10

20

30

40

50

60

Snowmelt:Rising Limb

Snowmelt:Falling Limb

Snowmelt:Falling Limb

TailTot

al P

hos

pho

rus

Loa

ding

(kg

P)

Nitrate

Total Phosphorus

2004 Snowmelt SeasonRising Limb: 4/22-5/6Falling Limb: 5/7-5/19

Falling Limb Tail: 5/20-6/14

Incline Creek Watershed:Contribution of Ski Creek

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Total Phosphorus

02468

1012

Snowmelt:Rising Limb

Snowmelt:Falling Limb

Snowmelt:Falling Limb

Tail

Tot

al N

itrat

e Lo

adin

g (k

g N

)

01020304050607080

Snowmelt:Rising Limb

Snowmelt:Falling Limb

Snowmelt:Falling Limb

Tail

Tota

l Pho

sphr

ous

Loa

ding

(kg

P)

Above Golf CourseBelow Golf Course

Nitrate

2004 Snowmelt SeasonRising Limb: 4/22-5/6Falling Limb: 5/7-5/19

Falling Limb Tail: 5/20-6/14

Third Creek Watershed:Above and Below Golf Course

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Ave. Ann. NO3-N Conc (unwtd.)

R2 = 0.3095

R2 = 0.03350

20406080

100

1970 1980 1990 2000 2010

Water Year

Nitr

ate-

N, u

g/l

Ward Cr. Blackwood Cr.

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Ratio of Ann. Ave. NO3-N Conc., Blackwood:Ward Same-day Samples

R2 = 0.279

01234

1970 1975 1980 1985 1990 1995 2000 2005 2010

Water Year

BC

/WC

Ave

. N

itrat

e

p < .001, by Kendall test w ith Trend-free Prew hitening

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TKN, Eagle Rock Cr.

0

5000

10000

15000

20000

25000

30000

2/8/90 11/4/92 8/1/95 4/27/98 1/21/01 10/18/03

Co

nce

ntr

atio

n, u

g/l

1.0

10.0

100.0

1000.0

Mea

n D

aily

Q, l

/sec

TKN MDQ

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Total Phosphorus, Eagle Rock Cr.

0

2000

4000

6000

8000

10000

2/8/90 11/4/92 8/1/95 4/27/98 1/21/01 10/18/03

Co

nce

ntr

atio

n, u

g/l

1.0

10.0

100.0

1000.0

Mea

n D

aily

Q, l

/secTP MDQ

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Nitrate-N, Eagle Rock Cr.

0100200300400500600700

2/8/90 11/4/92 8/1/95 4/27/98 1/21/01 10/18/03

Co

nce

ntr

atio

n, u

g/l

1.0

10.0

100.0

1000.0

Mea

n D

aily

Q, l

/secNitrate-N

MDQ

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Soluble Reactive Phosphorus, Eagle Rock Cr.

0200400600800

1000120014001600

2/8/90 11/4/92 8/1/95 4/27/98 1/21/01 10/18/03

Con

cent

ratio

n, u

g/l

1.0

10.0

100.0

1000.0

Mea

n D

aily

Q, l

/sec

SRPMDQ

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Soluble Reactive Phosphorus, Eagle Rock Cr.

0

50

100

150

200

250

7/8/02 10/16/02 1/24/03 5/4/03 8/12/03 11/20/03 2/28/04 6/7/04

Co

nce

ntr

atio

n, u

g/l

1.0

10.0

100.0

1000.0

Mea

n D

aily

Q, l

/sec

SRPMDQ

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