1 2013 Shell Creek Watershed Research Group Advisors: Mark Seier, Kylie Sweeter, and Danielle Amen Researchers: Demi Edgell, Jacob Haase, John O’Brien, Billy O’Brien, Megan Nelson, Brooke Pieke, Brett Weinman, Alex Wiese, Mariely Estrada, Garrett Flamme, Parker Wallin, Sadie Wallin, Esmeralda Arreguin, Celine Dunlap, Destiny Johnson, Joe O’Brien, and Nolan Wondercheck
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2013 Shell Creek Watershed Research Group
Advisors: Mark Seier, Kylie Sweeter, and Danielle Amen
Researchers: Demi Edgell, Jacob Haase, John O’Brien, Billy O’Brien, Megan Nelson, Brooke Pieke, Brett Weinman, Alex
• The Water Quality Index was developed by the National Sanitation Foundation as a standard system to compare different bodies of water.
• To determine the WQI, a series of nine tests were performed. These tests were: dissolved oxygen, fecal coliform, pH, Biological Oxygen Demand (BOD), temperature, total phosphate, nitrates, turbidity, and total solids. We also did a water discharge test which we use to measure the flow of the creek in cubic feet per second.
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• After the tests are completed, the WQI for each section of the creek can be computed.
• To formulate the WQI, we first computed Q-values.
• We multiply this number by a weighting factor, which provides a measure of the relative importance of each test to overall water quality.
• The water quality index ranges from zero to 100.
- 0 - 25 is very bad - 25 - 50 is bad - 50 - 70 is medium - 70 - 90 is good- 90 - 100 is excellent
• The bio-indicator tests are not part of the W.Q.I., but do give us a water quality rating.
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Sample W.Q.I. Curve Chart
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Sample W.Q.I. Form
Test Results Q-valueWeighting
FactorT o t a l
DO % sat. 0.17 Fecal Coliform col/100 mL 0.16
pH units 0.11 BOD mg/L 0.11
Temperature change in C 0.1 Total Phosphate mg/L 0.1
Nitrates mg/L 0.1 Turbidity JTU 0.08
Total Solids mg/L 0.07
Overall Water Quality Index ___
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May June July August0
0.5
1
1.5
2
2.5
3
3.5
2013 PrecipitationIn
ch
es
Date
10
May 24 June 26/27 July 16/17 August 26.3
6.6
6.9
7.2
7.5
7.8
8.1
8.4
pH
Site 1
Site 2
Site 3
Date
pH
Level
11
May 24 June 26 July 16/17 August 2-3
-2.5
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
Change in Water Temperature
Site 1
Site 2
Site 3
Site 4
Site 6
Site 5
Date
Deg
rees C
elc
ius
The higher the change, the worse the water quality.
12May 24 June 26/27 July 16/17 August 2
0
200
400
600
800
1000
1200
1400
1600
Total Solids
Site 1
Site 2
Site 3
Site 4
Site 6
Site 5
Date
mg
/LThe higher the concentration, the worse the water