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?