URBANIZATION IMPACTS ON STREAM NUTRIENT CONCENTRATIONS IN THE SEATTLE REGION hael T. Brett, 1 Sara E. Stanley, 1 Giorgios Arhondit vid M. Hartley, 2 Jonathan D. Frodge, 2 & David E. Fu 1 Department of Civil & Environmental Engineering, Box 352700, University of Washington, Seattle, WA 98195. 2 King County Water & Land Resources, 201 South Jackson St #600, Seattle, WA 98104-3854.
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URBANIZATION IMPACTS ON STREAM NUTRIENT CONCENTRATIONS IN THE SEATTLE REGION
URBANIZATION IMPACTS ON STREAM NUTRIENT CONCENTRATIONS IN THE SEATTLE REGION. Michael T. Brett, 1 Sara E. Stanley, 1 Giorgios Arhonditsis, 1 David M. Hartley, 2 Jonathan D. Frodge, 2 & David E. Funke 2. 1 Department of Civil & Environmental Engineering, - PowerPoint PPT Presentation
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URBANIZATION IMPACTS ON STREAM NUTRIENTCONCENTRATIONS IN THE SEATTLE REGION
Michael T. Brett,1 Sara E. Stanley,1 Giorgios Arhonditsis,1 David M. Hartley,2 Jonathan D. Frodge,2 & David E. Funke2
1Department of Civil & Environmental Engineering, Box 352700, University of Washington,
Seattle, WA 98195.
2King County Water & Land Resources, 201 South Jackson St #600,
Seattle, WA 98104-3854.
Land Cover
• 10 years, 17 streams, sampled monthly • Non-storm and storm samples
• 7 variables analyzed
King County Data
Land Cover Versus Stream Nutrients: Normal Flows
0
20
40
60
80
100
Geo
mea
n TP
(µg/
l)
0% 20%40%60%80%100%
Percent Urban Land Cover
r2 = 0.58
Total Phosphorus
0
10
20
30
40
50
Geo
mea
n SR
P (µ
g/l)
0% 20%40%60%80%100%
Percent Urban Land Cover
r2 = 0.56
Soluble Reactive Phosphorus
0
2
4
6
8
10
Geo
mea
n TS
S (m
g/l)
0% 20%40%60%80%100%
Percent Urban Land Cover
r2 = 0.03
Total suspended solids
0
1
23
4
5
6
Geo
mea
n tu
rbid
ity (N
TUs)
0% 20%40% 60%80%100%
Percent Urban Land Cover
r2 = 0.33
Turbidity
Tibbets
0
10
20
30
40
50
Geo
mea
n N
H 4 (µ
g/l)
0% 20%40%60%80%100%
Percent Urban Land Cover
r2 = 0.36
Ammonium
Tibbets
0
250
500750
1000
1250
1500
Geo
mea
n N
O 3 (µ
g/l)
0% 20%40%60%80%100%
Percent Urban Land Cover
r2 = 0.16
Nitrate
Change in Concentration: Storm/Normal Flow
0
2
4
6
8
10
12
14
TSS
(Sto
rm/N
orm
al F
low
)0% 20% 40% 60% 80% 100%
Percent Urban Land Cover
r2 = 0.09
Total Suspended Solids
Coal
0.0
0.5
1.0
1.5
2.0
2.5
3.0
TP (S
torm
/Nor
mal
Flo
w)
0% 20% 40% 60% 80% 100%
Precent Urban Land Cover
r2 = 0.03
Total Phosphorus
Coal
0.0
0.4
0.8
1.2
1.6
SRP
(Sto
rm/N
orm
al F
low
)
0% 20% 40% 60% 80% 100%
Percent Urban Land Cover
r2 = 0.51
Soluble Reactive Phosphorus
0.0
0.4
0.8
1.2
1.6
2.0
NO
3 (St
orm
/Nor
mal
Flo
w)
0% 20% 40% 60% 80% 100%
Percent Urban Land Cover
r2 = 0.67
Nitrate
0.0
0.5
1.0
1.5
2.0
2.5
NH 4
(Sto
rm/N
orm
al F
low
)
0% 20% 40% 60% 80% 100%
Percent Urban Land Cover
r2 = 0.18
Ammonium
0
2
4
6
8
Turb
idity
(Sto
rm/N
orm
al F
low
)
0% 20% 40% 60% 80% 100%
Percent Urban Land Cover
r2 = 0.11
Turbidity
Coal
55 ± 45%
67 ± 36%
244 ± 116%
184 ± 83%
1.0se
ason
al m
ean/
year
ly m
ean
Sum
mer
Fall
Win
ter
Sprin
g
Sum
mer
Nitrate & Ammonium
NH4
NO3
1.0
seas
onal
mea
n/ye
arly
mea
n
Sum
mer
Fall
Win
ter
Sprin
g
Sum
mer
Total & Soluble Reactive Phosphorus
SRP
TP
1.0
seas
onal
mea
n/ye
arly
mea
n
Sum
mer
Fall
Win
ter
Sprin
g
Sum
mer
TSS and Turbidity
Turbidity
TSS
2.0
0.50.50.5
2.02.0
Seasonal Fluctuations in Stream Constituent Concentrations
Average Average Percent Constituent Units Forested Urban Enrichment