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North Creek Water Quality Prepared by Jon Rogers and Carie McCoy.
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Transcript of North Creek Water Quality Prepared by Jon Rogers and Carie McCoy.
North Creek Water Quality
Prepared by Jon Rogers and Carie McCoy
Dr. Jaffe’s Environmental Chemistry Lab Class
January 21st – February 3rd, 2005
North Creek• Adjacent to the
UWB/CCC Campus in the Sammamish Valley of King County, WA
• Approximate latitude and longitude: 47o 45’ 21” N 122o 11’ 20”W
• Upstream Site: East of exit number 24 off I-405
• Downstream Site: Past the Boardwalk in the UWB/CCC Wetlands
Goals
• Determine if the wetland helps contribute to improved water quality.
• To determine if North Creek complies with state standards.
Study Parameters• pH: effects chemical and biological processes which occur in an
aquatic environment• Conductivity: measures ionic potential of the waterway• Temperature: influences rates of chemical and biological processes • Dissolved Oxygen (DO): concentration of oxygen which is in a
dissolved form in the water• Stream Flow: volume of water moving over a designated point at a
fixed period of time• Turbidity: measured amount of suspended sediments in the water• Nitrates: measure of nitrogen as nitrate (N03-N) in the water
• Phosphates: measure of phosphorous as phosphate (PO4-P) in the water
Effects of Parameters• pH: if pH is too acidic or alkaline than the water becomes
inhabitable by aquatic life (desired pH range 6.5-8.0)• Conductivity: effects the buffering capacity of the water• Temperature: influences amount of DO (optimal <20o)• DO: form of oxygen available for aquatic life• Stream Flow: help determine amount of impervious surface area in
the watershed• Turbidity: increased turbidity may cause damage to fish gills,
suffocating them• Nitrates: can determine amount of fertilizer runoff entering the
stream (septic runoff is also a source)• Phosphates: corallites with the amount of soaps and detergents in
the water
Profiling a stream
• Measure the width of the stream channel
• At equal intervals of width (0.5 m) measure stream death
• Post a reference point for future depth measurements
Significant Results• Flow
– Statistically significant difference (P=.01) in flow from the two sites
– Greater stream flow at the upstream site than downstream
– Possible reason is the water absorbing quality of the wetland
– Rain event prior to data collection and approximately 0.03 cm of precipitation during our survey
Upstream Site
-60.0
-50.0
-40.0
-30.0
-20.0
-10.0
0.00.0 100.0 200.0 300.0 400.0 500.0 600.0 700.0
width (cm)
dept
h (c
m)
profile 1-21profile 1-24profile 1-27profile 1-28profile 1-31profile 2-3
Downstream Site
-45.0
-40.0
-35.0
-30.0
-25.0
-20.0
-15.0
-10.0
-5.0
0.00.0 100.0 200.0 300.0 400.0 500.0 600.0 700.0
width (cm)
dept
h (c
m)
profile 1-21profile 1-24profile 1-27profile 1-28profile 1-31profile 2-3
Statistical Runner Up
• Conductivity– Using a paired T-test
we verified a P value of P=0.065
– Almost a significant difference. Desire P<0.05
– What if the study had a longer duration?
– Is there an outlier?
Comparison of Conductivity on an Upstreamand Downstream site
90
100
110
120
130
140
150
160
170
180
0 2 4 6 8
Collection number
Con
duct
ivity
(µs)
Upstream
Dow nstream
Conductivity
0.00
20.00
40.00
60.00
80.00
100.00
120.00
140.00
160.00
180.00
200.00
Mea
n va
lue
(µs)
Upstream
Dow nstream
Conclusions
• We found the wetland does help absorb runoff during rain events
• At the time of our study, the area of North Creek we evaluated does comply with Washington State Department of Ecology Standards for a class A stream
• Stream quality may change during other seasons
Questions?