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Long-term trends Overall water quality still very high
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Water Quality Assessment Cypress Creek
Adrian L. VoglAquatic Resources
Texas State University
Jason PinchbackRiver System InstituteTexas State University
Outline
• Long-term trends 1973-2007– Cypress Creek at RR-12
• Short-term trends 2003-2007– 4 sites on Cypress Creek– Jacob’s Well, RR-12, Blue Hole, Blanco River
• Conclusions• Decision Support System
Long-term trends
• Overall water quality still very high
Cypress Creek at RR-12Total Suspended Solids and Streamflow, 1973 - 2007
0
5
10
15
20
25
30
35
12/2/1973 5/25/1979 11/14/1984 5/7/1990 10/28/1995 4/19/2001 10/10/2006
TSS
(mg/
L)
0
20
40
60
80
100
120
flow
(cfs
)
TSS (mg/L) Flow (Moving average)
Long-term patternsFecal coliform and Streamflow
Cypress Creek at RR-12Fecal coliform and Stream Flow, 1973 - 2007
0
200
400
600
800
1000
1200
1400
7/20/1972 8/28/1976 10/6/1980 11/14/1984 12/23/1988 1/31/1993 3/11/1997 4/19/2001 5/28/2005 7/6/2009
Feca
l col
iform
(# c
olon
ies/
100m
L)
0
20
40
60
80
100
120
flow
(cfs
)
Fecal coliform Flow (Moving Average)
Cypress Creek at RR-12Total Phosphorus, 1973 - 2007
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
7/20/1972 8/28/1976 10/6/1980 11/14/1984 12/23/1988 1/31/1993 3/11/1997 4/19/2001 5/28/2005 7/6/2009
P (m
g/L)
Cypress Creek at RR-12Total Phosphorus, 1973 - 2007
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
7/20/1972 8/28/1976 10/6/1980 11/14/1984 12/23/1988 1/31/1993 3/11/1997 4/19/2001 5/28/2005 7/6/2009
P (m
g/L)
0
20
40
60
80
100
120
flow
(cfs
)
Cypress Creek at RR-12Nitrite + Nitrate, 1989 - 2007
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
8/11/1987 8/10/1989 8/10/1991 8/9/1993 8/9/1995 8/8/1997 8/8/1999 8/7/2001 8/7/2003 8/6/2005 8/6/2007
TSS
(mg/
L)
Cypress Creek at RR-12Total Suspended Solids and Streamflow, 1973 - 2007
0
5
10
15
20
25
30
35
12/2/1973 5/25/1979 11/14/1984 5/7/1990 10/28/1995 4/19/2001 10/10/2006
TSS
(mg/
L)
0
20
40
60
80
100
120
flow
(cfs
)
TSS (mg/L) Flow (Moving average)
Short-term Trends2003-2007
Short-term trends
• E coli, Nitrogen, and Total Suspended Solids correlate with flow peaks
• Also seeing some peaks at low flows
E coli and Flow at Blue Hole
0.00
500.00
1000.00
1500.00
2000.00
2500.00
3000.00
12/14/2005 3/24/2006 7/2/2006 10/10/2006 1/18/2007 4/28/2007
E. c
oli
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
Flow
(cfs
)
e coli flow
Short-term trends
Cypress Creek at RR-12Total Suspended Solids, 2000 - 2007
0
5
10
15
20
25
30
3/15/2000 7/28/2001 12/10/2002 4/23/2004 9/5/2005 1/18/2007
TSS
(mg/
L)
• Total suspended solids increased since 2000
Upstream to Downstream WQ
• Upstream to downstream trends– pH ↑– SC ↓– TSS ↑
TSS by site, 2003-2007
0
20
40
60
80
100
120
140
1 2 3 4Site
1=Jacob's Well, 2=RR-12, 3=Blue Hole, 4=CC at Blanco
TSS
(mg/
L)
MaximumMeanStd. Dev
E. Coli in Cypress Creek
• E. coli increases downstream, peaks at Blue Hole site
E. coli in Cypress Creek
0
400
800
1200
1600
2000
2400
Jacob's Well RR-12 Blue Hole CC atBlanco
# C
olon
ies/
100m
L
MaximumMean
Conclusions
• Need to have continued monitoring
• Multiple sites useful for – Determining upstream to downstream trends
– Identifying problem areas for NPS
– Observe long-term trends in WQ
Decision Support System(DSS)
Output Module
Database management systemTopographyHydrology
Water qualityLand Use/Land CoverEconomic Indicators
Simulation model(s)User Interface
DSS Purposes
• Better understand cause-and-effect relationships in the watershed
• Objectively compare the effects of possible land management practices
• Aid in reaching agreement regarding specific local areas in need of increased protection and the management strategies to be pursued
• Assist ongoing efforts in public outreach and education concerning the watershed management and water quality issues