Characterizing Baseline Water Body Conditions. What? Confirm impairments and identify problems...
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Transcript of Characterizing Baseline Water Body Conditions. What? Confirm impairments and identify problems...
![Page 1: Characterizing Baseline Water Body Conditions. What? Confirm impairments and identify problems Statistical summary Spatial analysis Temporal analysis.](https://reader030.fdocuments.in/reader030/viewer/2022032704/56649d575503460f94a36207/html5/thumbnails/1.jpg)
Characterizing Baseline Water Body Conditions
![Page 2: Characterizing Baseline Water Body Conditions. What? Confirm impairments and identify problems Statistical summary Spatial analysis Temporal analysis.](https://reader030.fdocuments.in/reader030/viewer/2022032704/56649d575503460f94a36207/html5/thumbnails/2.jpg)
What?
• Confirm impairments and identify problems• Statistical summary• Spatial analysis• Temporal analysis• Stressor identification
![Page 3: Characterizing Baseline Water Body Conditions. What? Confirm impairments and identify problems Statistical summary Spatial analysis Temporal analysis.](https://reader030.fdocuments.in/reader030/viewer/2022032704/56649d575503460f94a36207/html5/thumbnails/3.jpg)
Why?
• Lay groundwork for identification of causes and sources
• Document “before” conditions• Select and target BMPs• Support design of monitoring and evaluation
program
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Confirm impairments and identify problemsCompare available monitoring data to wqs, but
go beyond 305(b) or 303(d) assessments:• Assess magnitude of the impairment
– % exceedance
• When do impairments occur?– Seasonally?– Associated with rainfall or high flows?
• Where do impairments occur?
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![Page 6: Characterizing Baseline Water Body Conditions. What? Confirm impairments and identify problems Statistical summary Spatial analysis Temporal analysis.](https://reader030.fdocuments.in/reader030/viewer/2022032704/56649d575503460f94a36207/html5/thumbnails/6.jpg)
04-Jan-9512-Apr-95
19-Jul-9530-Oct-95
07-Feb-9615-May-96
19-Aug-9616-Dec-96
31-Mar-9702-Jul-97
06-Oct-9721-Jan-98
29-Apr-9829-Jul-98
09-Nov-98
1
10
100
1000
10000
100000
1000000
E C
oli
Co
un
ts (
#/10
0 m
l)
WS 1
WS 2
WS 3
E. Coli Counts 1995 - 1998Lake Champlain Basin Ag Watersheds NMP Project
![Page 7: Characterizing Baseline Water Body Conditions. What? Confirm impairments and identify problems Statistical summary Spatial analysis Temporal analysis.](https://reader030.fdocuments.in/reader030/viewer/2022032704/56649d575503460f94a36207/html5/thumbnails/7.jpg)
Statistical summary
Basic descriptive statistics:• Number of observations• Minimum, maximum, range• Mean, median• Variance• Skewness• Distribution
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Statistical summary
Always plot your data!
26-May-9408-Sep-94
22-Dec-9406-Apr-95
20-Jul-9502-Nov-95
15-Feb-9630-May-96
12-Sep-9626-Dec-96
10-Apr-97
Time
0
0.2
0.4
0.6
0.8
1
1.2
1.4
Mea
n W
eekl
y To
tal P
Con
cent
ratio
n (m
g/L)
WS 2
WS 3
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Statistical summary
Support design of monitoring program:Use observed variance in WQ data to establish effective sampling frequencies
n = t2 s2
d2
where:n = the calculated sample sizet = Student’s t at (n-1) degrees of freedom and
a specified confidence levels = estimate of the population standard deviation
d = acceptable difference of the estimate from the true mean
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Spatial Analysis
• Determine general distribution of water quality conditions, impairments
• Identify locations of critical areas, likely pollutant sources
• Determine impacts of a specific source
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![Page 12: Characterizing Baseline Water Body Conditions. What? Confirm impairments and identify problems Statistical summary Spatial analysis Temporal analysis.](https://reader030.fdocuments.in/reader030/viewer/2022032704/56649d575503460f94a36207/html5/thumbnails/12.jpg)
Temporal Analysis
Seasonality
04-Jan-9512-Apr-95
19-Jul-9530-Oct-95
07-Feb-9615-May-96
19-Aug-9616-Dec-96
31-Mar-9702-Jul-97
06-Oct-9721-Jan-98
29-Apr-9829-Jul-98
09-Nov-98
1
10
100
1000
10000
100000
1000000
E C
oli
Co
un
ts (
#/10
0 m
l) WS 1
WS 2
WS 3
E. Coli Counts 1995 - 1998Lake Champlain Basin Ag Watersheds NMP Project
![Page 13: Characterizing Baseline Water Body Conditions. What? Confirm impairments and identify problems Statistical summary Spatial analysis Temporal analysis.](https://reader030.fdocuments.in/reader030/viewer/2022032704/56649d575503460f94a36207/html5/thumbnails/13.jpg)
Temporal Analysis
Trends
0.00
0.10
0.20
0.30
0.40
0.50
0 12 24 36 48 60 72 84 96
Time (months)
Tota
l P C
once
ntra
tion
(mg/
L)
1
10
100
1000
10000
100000
1000000
Time E
. col
i (#/
100
ml)
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Temporal Analysis
Flow-concentration relationships
0.01
0.1
1
10
0.01 0.1 1 10
Discharge (L/s)
To
tal
P (
mg
/L)
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Temporal Analysis
Relationships among constituents
0
100
200
300
400
500
0 100 200 300 400
Turbidity (NTU)
To
tal S
usp
end
ed S
olid
s (m
g/L
)
.
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Identification of causes/sources
• Combine watershed observations + local knowledge + characterization analysis to identify causes and sources of impairment