Post on 22-Mar-2016
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2011 – 2012 Fall CreekPond Study
By: Esau Casetta, Austin Denzine, and Brett
Lewallen
Purposes and Ideas Behind the Project
• Esau – I have a interest in a career that involves natural resources.
• Austin – I am a new student at Wildlands this year. This project sounded like a great way to start the year.
• Brett – I also have an interest in a career in natural resources.
The Issues
• Sedimentation Issues and Mapping• Water Quality Issues and Trophic
State• Flushing Rate
Sedimentation/Mapping…
• Background/Problem• How has the pond changed over
the last 5 years?
2006 Fall Creek Pond Depth Map
2011 Fall Creek Pond Depth Map
Trophic State…
• What is it?• Why is it important?• How is it calculated?
These are the three main Trophic States...
• Oligotrophic• Mesotrophic• Eutrophic
Oligotrophic
Mesotrophic
Eutrophic
How We Converted Our Data Trophic State Index
Fall Creek Pond 2011-12
Site 1 Site 2 Site 3
Secchi in m Chl - a ppb Total P ppb Secchi in m Chl - a ppb Total P ppb Secchi in m Chl - a ppb Total P ppb
9/15/2011 0.69 309 300 9/15/2011 1.524 91 189 9/15/2011 0.762 10 166
9/26/2011 1.1 100 264 9/26/2011 1.1 46 238 9/26/2011 1.37 86 212
10/4/2011 1.2 35 241 10/4/2011 1.5 17 388 10/4/2011 1.7 38 365
10/25/2011 0.61 123 254 10/25/2011 0.76 87 218 10/25/2011 0.76 90 395
11/7/2011 0.76 76 232 11/7/2011 0.69 68 551 11/7/2011 1.37 234 805
Trophic State numbers derived visually from Carlson’s Trophic State Index graphic from EPA’s Lake and Reservoir Restoration Guidance Manual.
Secchi in m Secchi TSI Chl - a ppb Chl TSI Total P ppb P TSI9/15/2011 1.0 60 136.7 78 218.3 809/26/2011 1.2 58 77.3 74 238.0 8010/4/2011 1.5 55 30.0 65 331.3 80
25-Oct 0.7 65 100.0 75 289.0 8011/7/2011 0.9 62 126.0 77 529.3 80
Raw Data
Data averages converted to Trophic State Index values
Carlson’s Trophic State Index
Where is the Fall Creek Pond on this scale?
9/4/2011 9/14/2011 9/24/2011 10/4/2011 10/14/2011 10/24/2011 11/3/2011 11/13/20110
10
20
30
40
50
60
70
80
90
Trophic State Index, Fall Creek Pond 2011-12
Secchi TSIChl TSIP TSI
Date
Trop
hic S
tate
Inde
x N
umbe
r
Oligotrophic
Mesotrophic
Eutrophic
Flushing Rate…
• What is it?• Why is it important?• How is it calculated?
Flushing Rate Calculations…
• To Determine Flow Rate– Inflow and Outflow• Inflow = .2562 meters cubed/second = 22,135.68 meters
cubed/day • Outflow = .2246 meters cubed/second = 19,405.44 meters
cubed/day• Averaged = .2404 meters cubed/second = 20,770.56 meters
cubed/day– Volume of the pond = 95,780 meters cubed– 95,780 meters cubed/20,770.56 meters cubed/day = 4.6 days of
hydraulic residence time
Conclusion… Tying it all together
• New Map• Flushing Rate• Sedimentation Rate • Trophic State
Questions or
Comments?