U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
LAKE GIBSON
POLK COUNTY
FLORIDA
EPA REGION IV
WORKING PAPER No, 252
CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
•&G.P.O. 699-440
-------
REPORT
ON
LAKE GIBSON
POLK COUNTY
FLORIDA
EPA REGION IV
WORKING PAPER No, 252
•o
^
O
WITH THE COOPERATION OF THE
FLDRIDA DEPARTMENT OF ENVIRONMENTAL REGULATION
AND THE
FLORIDA NATIONAL GUARD
DECEMBER, 1977
-------
CONTFNTS
Page
Forev/ord ii
List of Florida Lakes iv
Lake and Drainage Area Map v
Sections
I. Conclusions 1
II. Lake and Drainage Basin Characteristics 4
III. Lake Water Quality Summary 5
IV. Nutrient Loadings 9
V. Literature Reviewed 14
VI. Appendices 15
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11
FOREWORD
The National Eutrophication Survey was initiated in 1972 in
response to an Administration commitment to investigate the nation-
wide threat of accelerated eutrophication to freshwater lakes and
reservoirs.
OBJECTIVES
The Survey was designed to develop, in conjunction with state
environmental agencies, information on nutrient sources, concentrations,
and impact on selected freshwater lakes as a basis for formulating
comprehensive and coordinated national, regional, and state management
practices relating to point-source discharge reduction and non-point
source pollution abatement in lake watersheds.
ANALYTIC APPROACH
The mathematical and statistical procedures selected for the
Survey's eutrophication analysis are based on related concepts that:
a. A generalized representation or model relating
sources, concentrations, and impacts can be constructed.
b. By applying measurements of relevant parameters
associated with lake degradation, the generalized model
can be transformed into an operational representation of
a lake, its drainage basin, and related nutrients.
c. With such a transformation, an assessment of the
potential for eutrophication control can be made.
LAKE ANALYSIS
In this report, the first stage of evaluation of lake and water-
shed data collected from the study lake and its drainage basin is
documented. The report is formatted to provide state environmental
agencies with specific information for basin planning [§303(e)], water
quality criteria/standards review [§303(c)], clean lakes [§314(a,b)]»
and water quality monitoring [§106 and §305(b)] activities mandated
by the Federal Water Pollution Control Act Amendments of 1972.
-------
m
Beyond the single lake analysis, broader based correlations
between nutrient concentrations (and loading) and trophic condi-
tion are being made to advance the rationale and data base for
refinement of nutrient water quality criteria for the Nation's
fresh water lakes. Likewise, multivariate evaluations for the
relationships between land use, nutrient export, and trophic
condition, by lake class or use, are being developed to assist
in the formulation of planning guidelines and policies by EPA
and to augment plans implementation by the states.
ACKNOWLEDGMENT
The staff of the National Eutrophication Survey (Office of
Research & Development, I). S. Environmental Protection Agency)
expresses sincere appreciation to the Florida Department of Environ-
mental Regulation for professional involvement and to the Florida
National Guard for conducting the tributary sampling phase of the
Survey.
Joseph W. Landers, Jr., Secretary of the Department of Environ-
mental Regulation; John A Redmond, former Director of the Division
of Planning, Technical Assistance, and Grants; and Dr. Tim S. Stuart,
Chief of the Bureau of Water Quality, provided invaluable lake docu-
mentation and counsel during the survey, reviewed the preliminary
reports, and provided critiques most useful in the preparation of this
Working Paper series.
Major General Henry W. McMillan (Retired), then the Adjutant
General of Florida, and Project Officer Colonel Hugo F. Windham,
who directed the volunteer efforts of the Florida National Guard,
are also gratefully acknowledged for their assistance to the Survey.
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iv
NATIONAL EUTROPHICATION SURVEY
STUDY LAKES
STATE OF FLORIDA
LAKE NAME
Alligator
Apopka
Banana
Crescent
Doctors
Dora
East Tohopekaliga
Effie
Eloise
George
Gibson
Glenada
Griffin
Haines
Hancock
Horseshoe
Howel1
Istokpoga
Jessie
Jessup
Kissinmee
Lawne
Lulu
Marion
Minnehaha
Minneola
Monroe
Munson
Okeechobee
Poinsett
Reedy
Seminole
Seminole
South
Talquin
Tarpon
Thonotosassa
Tohopekaliga
Trout
Weohyakapka
Yale
COUNTY
Columbia
Lake, Orange
Polk
Flagler, Putnam
Clay
Lake
Osceola
Polk
Polk
Putnam, Volusia
Polk
Highlands
Lake
Polk
Polk
Seminole
Orange, Seminole
Highlands
Polk
Seminole
Osceola
Orange
Polk
Polk
Orange
Lake
Seminole, Volusia
Leon
Glades, Hendry, Martin,
Okeechobee, Palm Beach
Brevard, Orange, Osceola
Polk
Jackson, FL; Decatur,
Seminole, GA
Pinellas
Brevard
Gadsden, Leon
Pinellas
Hillsborough
Osceola
Lake
Polk
Lake
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Tributary Sampling Site
X Lake Sampling Site
Sewage Treatment Facility
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LAKE GIBSON
STORE! NO. 1211
I. CONCLUSIONS
A. Trophic Condition:
Survey data indicate that Lake Gibson is eutrophic. Based
on a comparison of six parameters, it ranked nineteenth in over-
all trophic quality among the 41 Florida lakes sampled in 1973*.
Twenty-four of the lakes had less median total phosphorus and
median orthophosphorus, seven had less and one had the same
median inorganic nitrogen, 12 had less mean chlorophyll a_, and
22 had greater mean Secchi disc transparency.
Survey limnologists noted moderate to heavy growths of
macrophytes along the shoreline.
B. Rate-Limiting Nutrient:
The algal assay indicates that primary productivity in the
lake was limited by nitrogen at the time the assay sample was
collected (03/08/73). The lake data indicate nitrogen limitation
at the other sampling times as well.
C. Nutrient Controllability:
1. Point sources—During the sampling year, Gibson Lake
received a total phosphorus loading of 0.87 g/m2. This is
nearly four times that proposed by Vollenweider (Vollenweider
and Dillon, 1974) as a eutrophic loading.
It is calculated that about 34% of the total phosphorus
* See Appendix A.
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2
and 22% of the total nitrogen inputs to Lake Gibson were con-
tributed by the Lake Gibson Estates wastewater treatment plant.
However, even complete removal of phosphorus at this source
would only reduce the loading to 0.57 g/m2/yr (over 2% times
the eutrophic loading), and even though the critical level for
Florida lakes may be higher than that suggested by Vollenweider
(see page 13), it does not seem likely that point-source phos-
phorus control would result in a significant improvement in lake
condition.
The persistent nitrogen limitation during Survey sampling,
resulting from a combination of relatively low inorganic nitrogen
concentrations (median = 0.115 mg/1) and rather high orthophos-
phorus levels (median = 0.069 mg/1), indicates nitrogen control
might reduce the rate of eutrophication of the lake. However,
emphasis during the Survey was on the controllability of phos-
phorus, and a more intensive study of the nitrogen budget of
Lake Gibson is needed to determine the probable effects of point-
source nitrogen control.
2. Non-point sources—It is estimated that about 65% of the
phosphorus and 78% of the nitrogen inputs to Lake Gibson were
contributed by non-point sources. The largest contributions
were from the immediate watershed and small tributaries which
provided an estimated 48% of the phosphorus and 51% of the
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3
nitrogen. The 1944 U.S.G.S. Lakeland quadrangle map shows that
at that time land use in the immediate watershed was about evenly
divided between citrus groves and agricultural land. However,
it is probable that in the more than 30 years since the map was
published, expansion of the towns of Lakeland and Gibsonia has
shifted the land use to predominantly urban in the immediate
watershed.
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II. LAKE AND DRAINAGE BASIN CHARACTERISTICS1"
r tr, I,
A. Morphometry :
1. Surface area: 1.92 kilometers2.
2. Mean depth: 2.0 meters.
3. Maximum depth: 2.7 meters.
4. Volume: 3.840 x 106 m3.
5. Mean hydraulic retention time: 1.7 years (based on outflow).
B. Tributary and Outlet:
(See Appendix C for flow data)
1. Tributaries -
Drainage Mean flow
Name area (km2)* (m3/sec)*
Unnamed Creek B-l 1.9 0.02
Minor tributaries &
immediate drainage - 7.4 0.06
Totals 9.3 0.08
2. Outlet -
Unnamed Creek A-l 11.2** 0.07
C. Precipitation***:
1. Year of sampling: 103.6 centimeters.
2. Mean annual: 130.5 centimeters.
t Table of metric conversions—Appendix B.
tt No bathymetric map available. Surface area from FL Game & Fresh Water
Fish Comm. (Anonymous, 1972); depths estimated from soundings reported
in Appendix D.
* For limits of accuracy, see Working Paper No. 175, "...Survey Methods,
1973-1976".
** Includes area of lake.
*** See Working Paper No. 175.
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5
III. WATER QUALITY SUMMARY
Lake Gibson was sampled three times in 1973 by means of a pon-
toon-equipped Huey helicopter. Samples for physical and chemical
parameters were collected from four stations on the lake and from
one or more depths at each station (see map, page v). During each
visit, a single depth-integrated (near bottom to surface) sample was
composited from the stations for phytoplankton identification and
enumeration; and during the first visit, a single 18.9-liter depth-
integrated sample was composited for algal assays. Also each time,
a depth-integrated sample was collected from each of the stations for
chlorophyll a_ analysis. The maximum depths sampled were 1.5 meters
at stations 1, 2, and 3 and 1.8 meters at station 4.
The sampling results are presented in full in Appendix D and are
summarized in the following table.
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A. SUMMAKY OF PHYSICAL AND
CHEMICAL CHARACTERISTICS FOR LAKE GIBSON
STORET CODE 1211
PARAMETER
TEMP (C)
OISS OXY (MG/L)
CNDCTVY
PH (STAND UNITS)
TOT ALK (MG/L)
TOT P (MG/L)
ORTHO P (MG/L)
N02+N03 (MG/L)
AMMONIA (MG/L)
KJEL N (MG/L)
INORG N (MG/L)
TOTAL N (MG/L)
CHLRPYL A (UG/L)
SECCHI (METERS)
RANGE
21.5 - 25.3
4.8 - 8.7
150. - 170.
7.1 - 7.8
16. - 18.
0.072 - 0.165
0.055 - 0.070
0.050 - 0.070
0.030 - 0.070
0.800 - 1.200
0.100 - 0.140
0.860 - 1.270
11.1 - 18.7
0.6 - 0.8
NG ( 3/
TES
MEAN
23.6
7.3
159.
7.5
17.
0.134
0.061
0.063
0.053
1.033
0.117
1.097
14.3
0.7
8/73)
MEDIAN
24.2
8.3
160.
7.5
17.
0.143
0.060
0.065
0.055
1.050
0.115
1.115
13.0
0.6
2ND SAMPLING <11/
24.0
8.4
134.
8.0
18.
0.169
0.076
O.OtO
0.060
0.900
0.110
0.950
13.6
0.9
3
RAwGE
- 24. <+
8.6
- 135.
8.7
19.
- 0.207
- 0.102
- 0.050
- 0.070
- 1.300
- 0.110
- 1.340
- 17.0
0.9
SITES
MEAN
24.1
8.5
134.
8.3
19.
0.188
0.087
0.047
0.062
1.125
0.110
1.172
15.8
0.9
' 6/73)
MEDIAN
24.0
8.5
134.
8.2
19.
0.188
0.085
0.050
0.060
1.150
0.110
1.200
16.8
0.9
3RD SAMPLING ( 9/
28.1
5.8
152.
7.4
16.
0.144
0.026
0.100
0.090
1.600
0.190
1.720
33.0
0.6
2
RANGE
- 29.2
8.0
- 157.
8.5
32.
- 0.253
- 0.083
- 0.150
- 0.110
- 1.800
- 0.260
- 1.950
- 34.2
0.8
SITES
MEAN
28.6
7.0
155.
7.9
21.
0.204
0.062
0.117
0.100
1.750
0.217
1.867
33.6
0.7
4/73)
MEDIAN
28.5
7.2
155.
7.9
18.
0.210
0.069
0.110
0.100
1.800
0.210
1.900
33.6
0.7
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B. Biological characteristics:
1. Phytoplankton -
Sampling
Date
03/08/73
09/04/73
11/06/73
2. Chlorophyll a_ -
Sampli ng
Date
03/08/73
09/04/73
Dominant
Genera
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
Melosira sjj.
Dinobryon SJD.
Scenedesmus sjj.
Microcystis sp.
Flagellates
Other genera
Total
Lyngbya sp.
Microcystis sp.
Flagellates
Scenedesmus sp.
Centric diatoms
Other genera
Total
Flagellates
Microcystis sp.
Melosira sj).
Chroococcus sj).
Lyngbya sp.
Other genera
Total
Station
Number
1
2
3
4
1
2
3
4
Algal Units
per ml
.2,645
2,210
2,065
1,232
870
2.391
11,413
5,
2,
1,
1,
1
228
091
901
331
046
7.030
18,627
11,037
5,390
3,978
2,823
2,310
9,620
35,158
Chlorophyll a
(ug/D
13.0
11.1
18.7
33.0
34.2
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8
Sampli ng
Date
11/06/73
Station
Number
1
2
3
4
Chlorophyll a^
(yg/1)
13.6
16.8
17.0
C. Limiting Nutrient Study:
1. Autoclaved, filtered, and nutrient spiked -
Ortho P
Cone, (mg/1)
Inorganic N Maximum yield
Cone, (mg/1) (mg/1-dry wt.)
0.084
0.134
0.134
0.084
0.320
0.320
1.320
1.320
6.5
7.9
27.4
27.0
Spike (mg/1)
Control
0.050 P
0.050 P + 1.0
1.0 N
2. Discussion -
The control yield of the assay algal, Selenastrum capri-
cornutum, indicates that the potential primary productivity
of Lake Gibson was high at the time the composite sample was
collected. Also, the lack of significant change in yield with
an increased level of orthophosphorus, until nitrogen was
also added, shows that the lake was nitrogen limited at that
time. Note that the addition of only nitrogen resulted in a
yield far greater than that of the control.
Nitrogen limitation is also indicated by the lake data;
i.e., the mean inorganic nitrogen to orthophosphorus ratios
were less than 4 to 1 at all sampling stations and times.
-------
IV. NUTRIENT LOADINGS
(See Appendix E for data)
For the determination of nutrient loadings, the Florida National
Guard collected monthly near-surface grab samples from each of the
tributary sites indicated on the map (page v). Sampling was begun
in March, 1973, and was completed in February, 1974.
Through an interagency agreement, stream flow estimates for the
year of sampling and a "normalized" or average year were provided by
the Florida District Office of the U.S. Geological Survey for the
tributary sites nearest the lake.
In this report, nutrient loads for sampled tributaries were deter-
mined by using a modification of a U.S. Geological Survey computer
program for calculating stream loadings*. Nutrient loads for unsampled
"minor tributaries and immediate drainage" ("II" of U.S.G.S.) were esti-
mated using the nutrient loads, in kg/km2/yr, at station B-l and multi-
plying by the II area in km2.
The operator of the Lake Gibson Estates wastewater treatment plant
did not participate in the Survey, and nutrient loads were estimated
at 1.134 kg P and 3.401 kg N/capita/year.
* See Working Paper No. 175.
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10
A. Waste Sources:
1. Known municipal* -
Pop. Mean Flow Receiving
Name Served Treatment (m3/d) Water
Lake Gibson 508** act. sludge 189.2 Lake Gibson
Estates
2. Known industrial - None
* Treatment plant questionnaire.
** Population estimate based on 127 connections and 4 people per house.
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11
B. Annual Total Phosphorus Loading - Average Year:
1. Inputs -
kg P/ % of
Source yr total
a. Tributaries (non-point load) -
Unnamed Creek B-l 205 12.3
b. Minor tributaries & immediate
drainage (non-point load) - 800 48.0
c. Known municipal STP's -
Lake Gibson Estates 575 34.5
d. Septic tanks* - < 5 0.1
e. Known industrial - None
f. Direct precipitation** - 85_ 5.1
Total 1,665 100.0
2. Outputs -
Lake outlet - Unnamed Creek A-l 420
3. Net annual P accumulation - 1,245 kg.
* Estimate based on 7 lakeshore dwellings; see Working Paper No. 175.
** Brezonik and Shannon, 1971.
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12
C. Annual Total Nitrogen Loading - Average Year:
1. Inputs -
kg N/ % of
Source yr total
a. Tributaries (non-point load) -
Unnamed Creek B-l 1,045 13.0
b. Minor tributaries & immediate
drainage (non-point load) - 4,075 50.7
c. Known municipal STP's -
Lake Gibson Estates 1,730 21.5
d. Septic tanks* - 75 0.9
e. Known industrial - None
f. Direct precipitation** - 1,115 13.9
Total 8,040 100.0
2. Outputs -
Lake outlet - Unnamed Creek A-l 3,970
3. Net annual N accumulation - 4,070 kg.
D. Non-point Nutrient Export by Subdrainage Area:
Tri butary kg P/km2/yr kg N/km2/yr
Unnamed Creek B-l 108 550
* Estimate based on 7 lakeshore dwellings; see Working Paper No. 175.
** Brezonik and Shannon, 1971.
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13
E. Yearly Loads:
In the following table, the existing phosphorus loadings
are compared to those proposed by Vollenweider (Vollenweider
and Dillon, 1974). Note, however, that Florida lakes may be
able to assimilate phosphorus at a somewhat higher level than
that suggested by Vollenweider (Shannon and Brezonik, 1972).
Essentially, Vollenweider's "dangerous" loading is one
at which the receiving water would become eutrophic or remain
eutrophic; his "permissible" loading is that which would result
in the receiving water remaining oligotrophic or becoming
oligotrophic if morphometry permitted. A mesotrophic loading
would be considered one between "dangerous" and "permissible".
Vollenweider's model may not be applicable to water bodies
with short hydraulic retention times.
Total Phosphorus Total Nitrogen
Total Accumulated Total Accumulated
grams/m2/yr 0.87 0.65 4.2 2.1
Vollenweider phosphorus loadings
(g/m2/yr) based on estimated mean depth and
hydraulic retention time of Lake Gibson:
"Dangerous" (eutrophic loading) 0.22
"Permissible" (oligotrophic loading) 0.11
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14
V. LITERATURE REVIEWED
Anonymous, 1972. Annual progress report, water quality investigations.
Federal Aid in Fish Restoration, Dingell-Johnson Proj. No. F-21-6.
FL Game & Fresh Water Fish Commission, Tallahassee.
Brezonik, Patrick L., and Earl E. Shannon, 1971. Trophic state of
lakes in north central Florida. Publ. No. 13, FL Water Resources
Res. Ctr., U. of FL, Gainesville.
Shannon, Earl E., and Patrick L. Brezonik, 1972. Relationships
between lake trophic state and nitrogen and phosphorus loading
rates. Env. Sci. & Techn. 6^ (8): 719-725.
Vollenweider, R. A., and P. J. Dillon, 1974. The application of
the phosphorus loading concept to eutrophication research.
Natl. Res. Council of Canada Publ. No. 13690, Canada Centre
for Inland Waters, Burlington, Ontario.
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VI. APPENDICES
15
APPENDIX A
LAKE RANKINGS
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LAKE DATA TO 8E USED IN WANK INGS
LAKE
CODE
1201
1202
1303
1206
1207
1208
1209
1210
1211
1212
1214
1215
1217
1219
1220
1221
1223
1224
1227
1228
1229
1230
1231
1232
123-.
1236
1238
1239
LAKE
NAME
ALLIGATOR LAKE
LAKE
LAKE
LAKE
APOPKA
flANANA
CRESCENT
DOCTORS LAKE
LAKE
LAKE
LAKE
LAKE
DORA
EFFIE
GEORGE
GIBSON
GLENADA LAKE
LAKE
LAKE
LAKE
LAKE
LAKE
LAKE
LAKE
LAKE
LAKE
LAKE
LAKE
LAKE
LAKE
LAKE
LAKE
LAKE
LAKE
LAKE
GRIFFIN
HAINES
HANCOCK
HORSESHOE
MOHELL
ISTOKPOGA
JESSUP
KISSIMME.E
LULU
MARION
MINNErlAHA
MINNEOLA
MONROE
OKEECHOdEE
POINSETT
PEEOY
SOUTH
TALOUIN
MEDIAN
TOTAL P
0
0
0
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
1
0
0
0
0
0
0
0
0
0
.620
.102
.660
.065
.08<>
.102
.480
.129
.167
.134
.119
.063
.772
.034
.260
.039
.49?
.034
.490
.044
.038
.018
.138
.063
.065
.033
.074
.085
MEDIAN
INOriG N
O.?60
0.230
0.260
0.130
0.120
0.240
0.410
0.165
0.115
0.165
0.260
0.115
0.195
0.130
0.285
0.120
0.390
0.145
1.065
0.260
0.080
0.070
0.300
0.185
O.JSO
0.330
0.130
0.290
500-
MEAN StC
474.
484.
482.
473.
465.
4B2.
489.
469.
470.
454.
481.
462.
483.
459.
464.
464.
487.
463.
483.
468.
435.
406.
474.
472.
469.
468.
464.
462.
000
176
667
889
555
889
000
308
000
167
333
667
SOO
000
000
222
000
667
000
833
000
333
555
366
000
500
000
,167
MEAN
ClLOSA
87.733
4b.611
208.600
10.211
27.100
59.978
261.433
35.000
19.675
27.667
66.855
26.567
97.900
12.067
54.117
6.594
76.550
24.142
276.566
29.967
8.733
3.333
14.225
14.524
6.500
34.837
23.167
9.483
15-
MIN DO
13.100
8.200
3.600
10.200
10.600
7.400
15.000
11.000
10.200
14.700
6.600
lO.bOO
5.600
11.500
9.000
8.600
7.600
8.800
14.300
7.600
7.700
7.400
10.800
9.800
10.600
10. 600
9.000
14.. 400
MEDIAN
DISS OriTHO P
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
0
0
0
0
0
0
0
.386
.019
,293
.033
.028
.022
.950
.063
.069
.072
.038
.014
.158
.023
.175
.010
.288
.007
.030
.016
.012
.009
.12M
.010
.051
.008
.028
.031
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LAKE DATA TO BE USED IN RANKINGS
LAKE
CODE
1240
1241
121.2
1243
12*6
1247
121.8
121.9
1250
12S2
1258
1261
1261.
LAKE
LAKE
LAKE
TROUT
LAKE
LAKE
LAKE
LAKE
LAKE
LAKE
LAKE
LAKE
EAST
NAME
THONOTOSASSA
TOHOPEKALIGA
LAKE
HEOHYAKAPKA
TALE
MUNSON
SEMINOLE
LAWNE
TARPON
ELOISE
JESSIE
LAKE TOHOPEKALIGA
PAYNE'S PRAIRIE LAKE (NO
MEDIAN
TOTAL P
0
0
1
0
0
1
. 0
?
0
0
0
0
1
.6*5
.246
.110
.0*7
.027
.475
.234
.560
.041
.486
.OSl
.042
.260
MEDIAN
INORG N
0.095
0.200
0.650
0.080
0.160
0.925
0.175
1.350
0.070
0.170
0.090
0.070
0.140
500-
MEAN SEC
466
472
47?
458
441
486
473
494
400
465
452
440
476
.167
.917
.000
.667
.000
.667
.833
.667
.889
.333
.667
.833
.000
MEAN
CHLORA
37
30
76
7
25
140
102
84
6
70
26
5
88
.700
.63J
.967
.767
.367
.317
.000
.900
.867
.233
.300
.167
.200
15-
MIN 00
10.200
10.500
12.900
8.200
7.600
12.200
8.600
10.400
9.000
12.200
10.800
9.400
7.400
MEDIAN
OISS ORTHO P
0.565
0.152
0.970
0.011
0.014
0.852
0.026
0.117
O.U27
0.339
0.011
0.007
1.210
-------
PERCENT or LAKES *ITH HIGHER VALUES (NUMBER OF LAKES »ITH HIGHER VALUES)
LAKE
CODE
1201
1202
1203
1206
1207
1208
1209
1210
1211
1212
121*
1215
1217
1219
1220
1221
1223
122*
1227
1228
1229
1230
1231
1232
123*
1236
1238
1239
LAKE NAME
ALLIGATOR LAKE
LAKE APOPKA
LAKE BANANA
LAKE CRESCENT
DOCTORS LAKE
LAKE DORA
LAKE EFFIE
LAKE GEORGE
LAKE GIBSON
GLENADA LAKE
LAKE GrtlFFIN
LAKE HAINES
LAKE HANCOCK
LAKE HORSESHOE
LAKE HOWELL
LAKE ISTOKPOGA
LAKE JF.SSUP
LAKE KISS1MMEE
LAKE LULU
LAKE MARION
LAKE MINNE^AHA
LAKE MINNEOLA
LAKE MONROE
LAKE OKEECHOdEE
LAKE POINSETT
LAKE WEEOr
LAKE SOUTH
LAKE TALOUIN
MEDIAN
TOTAL P
25
50
23
65
60
53
5
45
40
43
4P
70
18
93
11
85
?8
90
3
78
ait
100
38
68
58
95
63
55
( 10)
( 20)
( 9)
( 26)
( 24)
( 21)
( 2>
( 18)
( 16)
< 17)
( 19)
( 28)
( 71
( 371
( 4)
( 34)
( 11)
( 36)
( 1)
( 3D
( 35)
I 40)
( 15)
( 27)
( 23)
( 36)
( H5)
( 22)
MEDIAN
INORG N
29
38
29
70
76
35
10
54
81
54
29
81
43
/O
23
76
1*
63
3
29
91
98
15
45
60
13
70
20
( 10)
( IS)
( 10)
( 27)
( 30)
( 14)
( 4)
( 21)
( 32)
( 211
( 10)
( 32)
( 17)
I 27)
( 9)
( 30)
( 7)
( 25)
( 1)
( 10)
( 36)
( 38)
( 6)
( 18)
( 24)
( 5)
( 27)
( 8)
500-
MEAN SEC
30 (
10 I
20 (
33 (
60 (
18 (
3 <
4K (
45 1
85 <
23 (
75 <
13 (
00 (
69 <
65 (
5' (
73 <
15 (
53 (
95 (
98 (
2s (
40 (
50 (
55 (
69 (
78 (
12)
4)
81
13)
24)
7)
1)
19)
13)
34)
•i>
30)
5)
32)
27)
26)
21
29)
6)
21)
38)
39)
11)
16)
20)
221
27)
311
MEAN
CHLORA
18
38
5
80
55
33
3
43
70
53
30
58
13
78
35
93
25
OS
0
bO
85
100
/S
73
95
4b
68
83
( 71
( 151
( 2)
( 321-
( 22)
( 13)
I 1)
( 1?)
( 28)
( 21)
1 12)
( 231
( 5)
( 3D
( 14)
( 37)
( 10)
< 26)
( 0)
( 20)
( 34)
( 40)
( 30)
( 29)
( 38)
I 16)
( 27)
( 33)
15-
MIN DO
10
74
100
48
34
90
0
23
48
3
95
34
98
20
60
69
83
65
8
83
78
90
26
53
34
34
60
5
( 4)
( 29)
( 40)
( 18)
( 12)
( 35)
I 0)
( 9)
( 18)
( 1)
( 38)
( 12)
( 39)
( 8)
( 23)
( 27)
( 32)
< 26)
( 3)
( 32)
( 31)
< 351
< 10)
< 21)
( 12)
( 12)
( 23)
( 21
MEDIAN
OISS OhifHO P
ia
70
23
SO
56
68
10
43
40
38
48
78
2d
65
3
89
25
99
5
73
80
93
33
89
45
95
56
53
( 7)
( 26)
( 91
( 20)
( 22)
( 271
( 4>
( 17)
( 16)
( 15)
( 19)
( 31)
( 11)
( 26)
( 1)
( 35)
1 10)
1 391
( 21
( 29)
( 321
( 37)
( 13)
( 3b)
I 18)
( 38)
( 22)
( 21)
INJE*
NO
130
260
200
346
341
297
31
256
324
276
273
396
213
406
201
477
Ib4
43S
34
366
517
579
21b
368
3*2
33 1
3d6
294
-------
PERCENT OF LAKES dITH HIGHER VALUES (NUMBED OK LAKES BlTH HIGHEH VALUES)
LAKE
CODE
13*0
1241
12*2
12*3
12*6
12*7
12*8
12*9
1250
1252
1258
1261
126-.
LAKE
LAKE
LAKE
TROUT
LAKE
LAKE
LAKE
LAKE
LAKE
LAKE
LAKE
LAKE
EAST
NAME
THONOTOSASSA
TOHOPEKALIGA
LAKE
MEOHYAKAPKA
YALE
MUNSON
SEMINOLE
LAWNE
TARPON
ELOISE
JESSIE
LAKE TOHOPEKALIGA
PAYNE'S PRAIRIE LAKE (MO
MEDIAN
TOTAL P
20 (
33 <
15 (
75 (
9B (
8 (
35 (
0 <
83 (
30 I
73 (
80 (
11 (
8)
13)
6)
30)
39)
31
1*1
0)
33)
12)
29)
32)
*)
MEDIAN
INORG N
85
*0
B
91
58
5
*e
0
98
50
dB
98
65
( 3*)
I 16)
( 3)
I 36)
< 23)
( 2)
( 19)
( 0)
< 38)
( 20)
( 35)
( 38)
( 26)
500-
MEAN
58
38
*3
83
90
8
35
0
100
63
88
93
25
SEC
( 23)
( 15)
( 17)
( 33)
( 36)
( 3)
( 14)
( 0)
( *0)
( 25)
( 35)
< 37)
( 10)
MEAN
CHLUWA
*0
*8
23
•dH
63
8
10
20
90
2el
60
98
15
I 16)
( 19)
I 9)
( 35)
( 25)
< 3)
( *)
( 8)
( 36)
( 11)
( 2*)
I 39)
1 6)
15-
MIN DO
*B
*0
13
7*
83
16
69
*3
60
16
26
55
90
( 18)
( 16)
( 5)
( 29)
< 32)
( 6)
( 27)
1 17>
( 23)
( 6)
I 10)
I 22)
( 3b>
MEDIAN
OISS OHTHO P
IS
30
B
a*
75
13
63
35
60
20
8*
99
0
( 6)
< 121
( 3)
) 33)
( 30)
< 5)
( 25)
I 1*1
( 2*)
( B)
( 33)
( 39)
( 0)
INDEX
NO
266
229
110
*9S
*67
58
260
VB
*91
207
*!•»
523
206
-------
LAKES RANKED BY INDEX NOS.
RANK LAKE CODE LAKE NAME INDEX NO
i 1230 LAKE MINNEOLA 579
2 1261 EAST LAKE TOriOPEKALIGA 523
3 1229 LAKE MINNEHAHA 517
4 1243 LAKE WEOHYAKAPKA 495
5 1250 LAKE TARPON 491
6 1221 LAKE ISTOKPOGA 477
7 1246 LAKE YALE 467
8 1224 LAKE KISSIMMEE 455
9 1258 LAKE JESSIE 419
10 1219 LAKE HORSESHOE 406
11 1215 LAKE HAINES 396
12 1238 LAKE SOUTH 386
13 1232 LAKE OKEECHUBEE 368
14 1228 LAKE MARION 366
15 1206 LAKE CRESCENT 346
16 1234 LAKE POINSETT 342
17 1207 DOCTORS LAKE 341
18 1236 LAKE REEOt 337
19 1211 LAKE GIbSON 324
20 1208 LAKE DORA 297
21 1239 LAKE TALOUIN 294
22 1202 LAKE APOPHA 280
23 1212 GLENADA LAKE 276
24 1214 LAKE GRIFFIN 273
25 1240 LAKE THONOTOSASSA 266
26 1248 LAKE SEMINOLE 260
27 1210 LAKE GEORGE 256
28 1241 LAKE TOHOPEKAL1GA 229
-------
LAKES RANKED BY INOE* NOS.
RANK LAKE CODE LAKE NAME INOEX NO
29
30
31
32
33
3-.
35
36
37
38
3")
-------
APPENDIX B
CONVERSION FACTORS
-------
CONVERSION FACTORS
.Hectares x 2.471 = acres
Kilometers x 0.6214 = miles
Meters x 3.281 = feet
Cubic meters x 8.107 x 10 "4 = acre/feet
Square kilometers x 0.3861 = square miles
Cubic meters/sec x 35.315 - cubic feet/sec
Centimeters x 0.3937 = inches
Kilograms x 2.205 = pounds
Kilograms/square kilometer x 5.711 = Ibs/square mile
-------
APPENDIX C
TRIBUTARY FLOW DATA
-------
.RIBiriARY FLOW INFORMATION FOR FLORIDA
8/25/75
LAKE CODE 1211
GIBSON LAKE
TOTAL
TRIBUTARY
1211A1
1211B1
1211ZZ
DRAINAGE AREA OF LAKE (SO KM)
SUB-DRAINAGE
AREA (SO KM) JAN
11.2
1.9
7.3
0.05
0.01
0.04
FEB
0.05
0.01
0.03
11.
MAR
0.09
0.02
0.07
2
APR
0.07
0.01
0.02
MAY
0.03
0.00
0.01
NORMALIZED FLOWS (CMS)
JUN JUL AUG
0.05
0.01
0.04
0.08
0.03
0.11
0.08
0.04
0.15
SEP
0.14
0.04
0.13
OCT
0.12
0.01
0.04
NOV
0.06
0.01
0.03
DEC
0.05
0.01
0.04
MEAN
0.07
0.02
0.06
MEAN MONTHLY FLOWS AND DAILY FLOWS(CMS)
TRIBUTARY MONTH YEAR
1211A1
121181
1211ZZ
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
1
2
73
73
73
73
73
73
73
73
73
73
74
74
73
73
73
73
73
73
73
73
73
73
74
74
73
73
73
73
73
73
73
73
73
73
74
74
MEAN FLOW DAY
0.05
0.06
0.01
0.01
0.03
0.06
0.25
0.11
0.01
0.01
0.01
0.01
0.01
0.00
0.00
0.00
0.01
0.02
0.04
0.00
0.00
0.01
0.01
0.00
0.03
0.02
0.00
0.01
0.04
0.07
0.14
0.01
0.02
0.03
0.02
0.01
17
13
18
15
13
16
14
12
19
14
18
15
17
13
18
15
13
16
14
12
19
14
18
15
17
13
18
15
13
16
14
12
19
14
18
15
SUMMARY
TOTAL DRAINAGE AREA OF LAKE = 11.2
SUM OF SUB-DRAINAGE AREAS = 9.2
TOTAL FLOW IN
TOTAL FLOW OUT
0.88
0.87
FLOW DAY
0.03
0.09
0.01
0.01
0.03
0.07
0.34
0.20
0.01
0.01
0.01
0.01
0.00
0.00
0.00
0.00
0.00
0.01
0.04
0.00
0.00
0.01
0.01
0.00
0.02
0.02
0.00
0.01
0.02
0.04
0.14
0.01
0.01
0.02
0.02
0.01
FLOW DAY
FLOW
-------
APPENDIX D
PHYSICAL and CHEMICAL DATA
-------
STORET RETRIEVAL DATE 75/08/35
121101
28 06 JO.O 081 57 22.0
LAKE GIBSON
12105 FLORIDA
DATE
FROM
TO
73/03/08
73/11/06
TIME DEPTH
OF
DAY FEET
16 00 0000
16 00 0005
15 40 0000
00010
WATER
TEMP
CENT
24.2
21.5
24.4
00300 00077 00094
DO TRANSP CNDUCTVY
SECCHI FIELD
MG/L INCHES MICROMHO
8.3
8.6
33
36
150
160
135
HEPALES
3
00400
PH
SU
7.80
7.70
8.70
00410
T ALK
CAC03
MG/L
16
18
18
2111202
0009 FEET DEPTH
00610
NH3-N
TOTAL
MG/L
0.050
0.030
0.060
00625
TOT KJEL
N
MG/L
1.200
1.200
1.100
00630
N02&N03
N-TOTAL
MG/L
0.050
0.070
0.050
00671
PHOS-DIS
ORTHO
MG/L P
0.055
0.057
0.076
00665 32217
DATE TIME DEPTH PHOS-TOT CHLRPHYL
FROM OF A
TO DAY FEET MG/L P UG/L
73/03/08 16 00 0000 0.134 13.0
16 00 0005 0.165
73/11/06 15 40 0000 0.174 13.6
-------
STORET RETRIEVAL DATE 75/08/25
131102
28 06 20.0 081 57 42.0
LAKE GIBSON
12 FLORIDA
00010
DATE TIME DEPTH WATER
FROM OF TEMP
TO . QAY FEET CENT
73/03/08 16 25 0000 24.4
16 25 0005 21.8
73/11/06 15 10 0000 24.0
15 10 0001 24.0
15 10 0004 24.0
00300 00077
DO TRANSP CIN
SECCHI FIELD
MG/L INCHES MI
4.8
8.4
8.4
24
34
11EPALES
3
2111202
0009 FEET
DEPTH
94
TVY
MHO
155
160
134
134
135
00400
PH
SU
7.60
7.50
8.20
8.30
00410
T ALK
CAC03
MG/L
18
16
18
19
00610
NH3-N
TOTAL
MG/L
0.050
0.060
0.070
0.060
00625
TOT KJEL
N
MG/L
1.100
1.000
1.300
0.900
00630
N02&N03
N-TOTAL
MG/L
0.060
0.070
0.040
0.050
00671
PHOS-DIS
ORTHO
MG/L P
0.059
0.062
0.102
0.091
00665 32217
DATE TIME DEPTH PHOS-TOT CHLRPHYL
FROM OF A
TO DAY FEET MG/L P UG/L
73/03/08 16 25 0000 0.124 11.1
16 25 0005 0.15S
73/11/06 15 10 0000 0.207 16.8
15 10 0004 0.202
-------
STORET RETRIEVAL DATE 75/03/25
121103
28 06 45.0 081 57 56.0
LAKE GIBSON
12105 FLORIDA
DATE
FROM
TO
73/03/08
73/09/04
73/11/06
TIME DEPTH
OF
DAY FEET
17 00 0000
17 00 0004
14 45 0000
14 45 0005
15 30 0000
15 30 0001
00010
WATER
TEMP
CENT
25.3
24.2
29.2
28.7
24.1
24.1
00300 00077 00094
DO TRANSP CNDUCTVY
SECCHI FIELD
MG/L INCHES MICROMHO
8.7
8.0
7.2
8.6
24
24
35
170
160
156
157
134
134
11EPALES
3
00400
PH
SU
7.10
7.50
8.50
8.00
8.00
00410
T ALK
CAC03
MG/L
17
16
32
18
19
211
0008
00610
NH3-N
TOTAL
MG/L
0.060
0.070
0.100
0.090
0.060
1202
FEET DEPTH
00625
TOT KJEL
N
MG/L
0.800
0.900
1.600
1.800
1.200
00630
N02&N03
N-TOTAL
MG/L
0.060
0.070
0.120
0.100
0.050
00671
PHOS-DIS
ORTHO
MG/L P
0.062
0.070
0.026
0.083
0.080
00665 32217
DATE TIME DEPTH PHOS-TOT CHLRPHYL
FROM OF A
TO DAY FEET MG/L P UG/L
73/03/08 17 00 0000 0.072 18.7
17 00 0004 0.152
73/09/04 14 45 0000 0.182 33.0
14 45 0005 0.239
73/11/06 15 30 0000 0.169 17.0
-------
STORE! RETRIEVAL DATE 75/08/25
121104
28 06 30.0 081 57 30.0
LAKE GIBSON
12105 FLORIDA
00010
DATE TIME DEPTH WATER
FROM OF TEMP
TO DAY FEET CENT
73/09/04 15 10 0000
15 10 0006
28.4
28.1
00300 00077 00094
DO TRANSP CNDUCTVY
SECCHI FIELD
MG/L INCHES MICROMHO
5.8
30
153
152
HEP ALES
4
00400
PH
SU
7.80
7.40
00410
T ALK
CAC03
MG/L
16
17
2111202
0008 FEET DEPTH
00610
NH3-N
TOTAL
MG/L
0.110
0.100
00625
TOT KJEL
N
MG/L
1.800
1.800
00630
N02&N03
N-TOTAL
MG/L
0.150
0.100
00671
PHOS-DIS
ORTHO
MG/L P
0.068
0.070
00665 32217
DATE TIME DEPTH PHOb-TOT CHLRPHYL
FROM OF A
TO DAY FEET MG/L P OG/L
73/09/04 15 10 0000 0.144 34.2
15 10 0006 0.253
-------
APPENDIX E
TRIBUTARY DATA
-------
STORET RETRIEVAL DATE 75/08/25
DATE TIME DEPTH N02&N03
FROM OF
TO DAY FEET
73/03/17
73/04/13
73/05/18
73/06/15
73/07/13
73/08/16
73/09/14
73/10/12
73/11/19
73/12/14
74/01/18
74/02/15
08 20
10 30
10 50
13 47
10 15
13 22
15 25
11 10
14 50
15 20
10 55
14 45
1211A1
28 06 30.0 081 57 00.0
STRM CONN LAKES GIBSON & PARKER
12127 7.5 LAKELAND
0/LAKt GIBSON
MED DUTY RD BROG
11EPALES 2111204
4 0000 FEET DEPTH
10630
I&N03
OTAL
IG/L
0.032
0.032
0.054
0.054
0.072
0.030
0.017
0.010K
0.132
0.044
0.038
0.044
00625
TOT KJEL
N
MG/L
1.680
1.320
1.320
0.950
1.100
2.500
4.000
1.050
2.400
1.100
0.700
1.500
00610
NH3-N
TOTAL
MG/L
0.115
0.176
0.100
0.066
0.180
0.120
0.230
0.029
0.128
0.168
0.076
0.055
00671
PHOS-DIS
ORTHO
MG/L P
0.060
0.063
0.067
0.069
0.048
0.072
0.100
0.081
0.192
0.060
0.058
0.065
00665
PHOS-TOT
MG/L P
0.300
0.155
0.170
0.120
0.108
0.185
0*240
0.165
0.960
0.185
0.160
0.185
K VALUE KNOWN TO BE
LESS THAN INDICATED
-------
STORE! RETRIEVAL DATE 75/08/25
1211B1
28 07 00.0 081 57 00.0
UNNAMED STREAM
12 7.5 LAKELAND
T/LAKE GIBSON
MED DUTY RD 8RDG
11EPALES 2111204
4 0000 FEET
DEPTH
DATE TIME DEPTH N02&N03
FROM OF
TO DAY FEET
73/03/17
73/04/13
73/05/18
73/06/15
73/07/13
73/08/16
73/09/14
73/10/12
73/11/19
73/12/14
74/01/18
74/02/15
08 25
10 35
10 55
13 50
10 25
13 26
15 30
11 15
14 45
15 25
10 50
14 53
0630
&N03
OTAL
G/L
0.066
0.080
0.176
0.126
0.052
0.037
0.071
0.120
0.056
0.080
0.160
00625
TOT KJEL
N
MG/L
1.000
0.720
2.800
2.600
2.400
1.500
0.850
5.800
0.550
0.900
2.900
00610
NH3-N
TOTAL
MG/L
0.058
0.100
0.160
0.140
0.110
0.054
0.069
0.044
0.044
0.060
0.060
00671
PHOS-DIS
ORTHO
MG/L P
0.390
0.252
0.320
0.330
0.450
0.580
0.430
0.480
0.176
0.336
0.315
00665
PHOS-TOT
MG/L P
0.410
0.260
0.345
0.420
0.015
0.460
0.630
0.460
0.940
0.180
0.375
0.500
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