Hart
Lake 2009 Annual Report
Volunteer Collector:
Josh Teigen
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DNR Region: NO |
Waterbody Number: 2903200 |
GEO Region:NW |
Site Name |
Storet # |
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043079 |
Date |
SD (Secchi depth) |
Hit |
TSI (Trophic State Index) |
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Clarity |
Color |
Perception |
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25.5 |
NO |
30 |
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CLEAR |
GREEN |
1 |
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22.5 |
NO |
32 |
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CLEAR |
GREEN |
1 |
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25.5 |
NO |
30 |
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CLEAR |
GREEN |
1 |
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22 |
NO |
33 |
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CLEAR |
GREEN |
1 |
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22.5 |
NO |
32 |
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CLEAR |
GREEN |
1 |
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21.5 |
NO |
33 |
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CLEAR |
GREEN |
1 |
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24.5 |
NO |
31 |
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CLEAR |
GREEN |
1 |
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21.5 |
NO |
33 |
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CLEAR |
GREEN |
1 |
Date |
Collector Comments |
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Partly cloudy
and a nice chop on the lake. |
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Sunny.....no
clouds |
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Sunny.....no
clouds |
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Sunny and a
little chop on the water |
Average Summer (July-August) Secchi Readings by
Year
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DNR Region: NO |
Waterbody Number: 2903200 |
GEO Region:NW |
Avg
July-Aug Secchi Depth (ft) |
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Past secchi averages in feet (July and August only).
Year |
Secchi Mean |
Secchi Min |
Secchi Max |
Secchi Count |
1993 |
19 |
19 |
19 |
2 |
2004 |
20.8 |
19.75 |
22 |
5 |
2007 |
18.5 |
15.7 |
21.3 |
4 |
2009 |
22.8 |
21.5 |
25.5 |
5 |
The average for the
Trophic
State Index Report – 2009
Trophic
state index (TSI) is determined using a mathematical formula (
The overall Trophic State
Index (based on Secchi) for
Past Summer (July-August) Trophic State
Index (TSI) averages.
Trophic
State Index Graph
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TSI(TP) = TSI(Sec) > TSI(Chl) |
Non-algal particulate or color dominate light attenuation |
TSI(Sec) = TSI(Chl) >= TSI(TP) |
The algae biomass in your lake is limited by phosphorus |
TSI(TP) > TSI(Chl) = TSI(Sec) (2007) |
Zooplankton grazing, nitrogen, or some factor other than phosphorus
is limiting algae biomass |
TSI |
TSI Description |
TSI < 30 |
Classical oligotrophy: clear water,
many algal species, oxygen throughout the year in bottom water, cold water,
oxygen-sensitive fish species in deep lakes. Excellent water quality. |
TSI 30-40 |
Deeper lakes still oligotrophic, but bottom water of some
shallower lakes will become oxygen-depleted during the summer. |
Understanding Your
For more information about
understanding your lake data as it relates to water clarity, click on the
following link and go to Page 79.
http://dnr.wi.gov/lakes/CLMN/manuals/0910chem/ChemistryMan76-91.pdf
If you have any questions, please contact Jane Swenson, swensonje@cheqnet.net