Transcript No Slide Title

Does this picture look familiar? Anyone who has been to
Lake Eau Claire knows exactly the feeling that the person
who took this picture shared, yuck. Phosphorus is one the
of the main reason for algae growth. Phosphorus is
brought into lakes through tributaries and turnover from
sedimentation on the bottom of the lake.
By: Dan Carey
How can I convert the data to useable
figures regarding total lake area or volume?
What ways can I represent the result?
How can I measure and calculate
the amount of water leaving the basin?
How can I measure and calculate
the amount of water leaving the basin?
What factors needed to be measured and
taken into account to know about the
volume of the lake?
Where is the most phosphorus coming
from, the sediment or the tributaries?
The lake has water quality
problems and it has to do
mainly with chlorophyll and
phosphorus.
Lake Eau Claire annually has a very
large abundance of algae growth
every year.
This can be because of the pollutants
that are introduced by the following
tributaries: Hay Creek, Muskrat Creek,
and the Eau Claire River.
Lake Eau Claire is a basin, so it has a
faster than normal turnover rates when
it come to lakes.
When the water is entering and leaving
the basin, that turnover/flow causes
sediment to be kicked up, introducing
“old” pollutants back into the lake.
The most common habitat that the
tributaries wind through is mostly
agricultural areas and county forest.
Also, two out of the three tributaries
have quite poor water quality at the
mouth: Muskrat creek the North Fork
of the Eau Claire River.
The next mission I had was to find the
volume of the lake so that I could use it to
calculate the loading and “unloading”
of Phosphorus and sediment. So I took a
map of Lake Eau Claire and cut out each
depth of the lake. Then I set up proportions
that had to deal with the known size and
the weight out of a whole of the sections of
the lake.
After this, it was time to start getting
tests done for phosphorus and
inflow/outflow. So I went to four
designated sites, which will be specified
later, and I took bottles filled them up
and I took the flow with the flow meter
at each site.
After I finish all of the outdoor testing,
then it was time for a the long, drawn out
indoor testing for phosphorus. The
directions for the procedures came from
the “HACH Test ‘N Tube procedures”
packet. I went out to test, then came back
to finish it 7 times.
Field methods
were quite simple.
The first of the two, the flow meter, was
turned on and the propeller end was stuck
in the water and I waited till the ft/sec speed
stopped going up, and then I would mark it
down. The second thing I would do would
be to fill up two bottles per site, with water,
and mark down the number on the bottle.
This object is a
flow meter which
measures how fast the water is moving in
feet per second. It is hooked up to a
graphing calculator which displays the
speed.
Sample bottles were
used to hold samples
of water from each of
the four sites so that
they could be taken
back to the lab to be
tested for phosphorus.
The labs methods
weren’t quite as simple.
I had to follow the
Hach Test n’ Tube P Testing step by step.
This process, in a whole, took about 2 hours
to complete. Sediment testing took a couple
of days to complete.
The Hach Analytical
Procedures
Test n’ Tube
Phosphorus Testing
Manuel was used for
the procedures for
testing for phosphorus when the samples
were taken back to the lab.
This is the
Spectrophotometer
and it is used
for measuring
how “turbid”
or how much
phosphorus is
present in a
solution by shooting light waves through it
and seeing how able the waves are to get
through.
The Hach test tubes
where used in holding the samples and the
chemicals needed to test phosphorus. I
used 12 test tubes, 3 for each site, to get
a better average of phosphorus for each
site.
These Hach
Test n’ Tube
chemicals were used
in the testing
process. The
following chemicals
were used:
Potassium Persulfate, PhosVer Phosphate
Reagent, Sulfuric Acid, and Sodium
Hydroxide.
Inflow/Outflow
Site
Area In2
1
2
3
4
11/6/03
4128
516
15402
17202
Area ft2
flow ft/sec
flow vol ft3/sec
28.66666667
1.043
29.89933333
3.583333333
4.62
16.555
106.9583333
1.9
203.2208333
119.4583333
0.88
105.1233333
In
151.58 ft3/sec
Out
203.22 ft3/sec
Area ft2
flow ft/sec
flow vol ft3/sec
28.66666667
1.79
51.31333333
3.583333333
5.65
20.24583333
106.9583333
1.79
191.4554167
119.4583333
0.824
98.43366667
In
169.99 ft3/sec
Out
191.46 ft3/sec
Outflow Turnover in Sec. O.T. in Days
14808816.01
171.3983334
12/10/03
Site
Area In2
1
2
3
4
4128
516
15402
17202
Inflow/Outflow
1/13/04
Site
Area In2
Area ft2
flow ft/sec
flow vol ft3/sec
In
4128 28.66666667
2.51
71.95333333 202.975 ft3/sec
516 3.583333333
0.56
2.006666667 Out
15402 106.9583333
1.35
144.39375 144.394 ft3/sec
17202 119.4583333
1.08
129.015
Area In2
Area ft2
flow ft/sec
Flow vol ft3/sec In
4128 28.66666667
2.43
69.66 213.15 ft3/sec
516 3.583333333
5.34
19.135 Out
15402 106.9583333
3.24
346.545 346.55 ft3/sec
17202 119.4583333
1.041
124.356125
1
2
3
4
3/24/04
Site
1
2
3
4
Inflow/Outflow
Site
Area In2
Area ft2
flow ft/sec
flow vol ft3/sec In
4128 28.66666667
3.79
108.6466667 277.56 ft3/sec
516 3.583333333
6.8
24.36666667 Out
15402 106.9583333
2.76
295.205 295.21 ft3/sec
17202 119.4583333
1.21
144.5445833
Area In2
Area ft2
flow ft/sec
flow vol ft3/sec In
4128 28.66666667
2.79
79.98 235.99 ft3/sec
516 3.583333333
5.2
18.63333333 Out
15402 106.9583333
2.51
268.4654167 268.47 ft3/sec
17202 119.4583333
1.15
137.3770833
1
2
3
4
4/14/04
Site
1
2
3
4
Phosphorus Loading
Day 1
Inflow
Loading Estimates
11/6/03
MGD
Mg/L
LBS/Da
97.92068
0.177 144.5485494
Outflow
131.28012
Day 2
0.08 87.59009606
12/10/03
MGD
Inflow
Mg/L
LBS/DA
109.81354
0.1727 158.1664183
Outflow
123.68316
Day 3
0.07 72.20622881
1/13/04
MGD
Inflow
Mg/L
LBS/DA
131.12185
0.456 498.6616404
Outflow
93.278524
0.123 95.68697549
Phosphorus Loading
Day 4
3/24/04
MGD
Inflow
137.69
LBS/DA
0.19 218.183574
Outflow
223.87
0.04
Day 5
Mg/L
74.683032
3/25/04
MGD
Inflow
179.69
LBS/DA
0.15
224.79219
Outflow
190.71
0.06
Day 6
Mg/L
95.431284
4/14/04
MGD
Mg/L
Inflow
152.45
LBS/DA
0.16
203.42928
Outflow
173.43
0.12
173.568744
11
/6
/
11 03
/1
3/
11 03
/2
0/
11 03
/2
7/
0
12 3
/4
/
12 03
/1
1/
12 03
/1
8/
12 03
/2
5/
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1/
1/
04
1/
8/
0
1/ 4
15
/0
1/ 4
22
/0
1/ 4
29
/0
4
2/
5/
0
2/ 4
12
/0
2/ 4
19
/0
2/ 4
26
/0
4
3/
4/
0
3/ 4
11
/0
3/ 4
18
/0
3/ 4
25
/0
4
4/
1/
04
4/
8/
04
LBS/Day
LBS/Day Phosphorus Loading
600
500
400
300
Inflow
Outflow
200
100
0
Dates
I conclude that the inflow of phosphorus
into the lake is much greater than that
leaving the lake. The highest rate of flow
is spring time, and it is more of a gradual
thing during the times of summer, fall,
and winter. Winter is the lowest time.