U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
U\KE TARPON
FINELY COUNTY
FLORIDA
EPA REGION IV
WORKING PAPER No, 275
CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
699-440
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REPORT
ON
LAKE TARPON
PINELLAS COUNIY
FLORIDA
t«»
£ EPA REGION IV
WORKING PAPER No, 275
3
WITH THE COOPERATION OF THE
RDRIDA DEPARTMENT OF ENVIRONMENTAL REGULATION
AND THE
FLORIDA (NATIONAL GUARD
DECEMBER, 1977
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CONTENTS
Page
Foreword i i
List of Florida Lakes iv
Lake and Drainage Area Map v
Sections
I. Conclusions 1
II. Lake and Drainage Basin Characteristics 3
III. Lake Water Quality Summary 4
IV. Nutrient Loadings 8
V. Literature Reviewed 13
VI. Appendices 14
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ii
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.
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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, li. 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
LAKE NAME
Alligator
Apopka
Banana
Crescent
Doctors
Dora
East Tohopekaliga
Effie
Eloise
George
Gibson
Glenada
Griffin
Hair.es
Hancock
Horseshoe
Howel1
Istokpoga
Jessie
Jessup
Ktssimmee
Lawne
Lulu
Marion
Minnehaha
Mfnneola
Monroe
Munson
Okeechobee
Poinsett
Reedy
Seminole
Semi nole
South
Talquin
Tarpon
Thonotosassa
Tohopekaliga
Trout
Weohyakapka
Yale
NATIONAL EUTROPHICATION SURVEY
STUDY LAKES
STATE OF FLORIDA
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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Salt
Lake
TARPON
SPRINGS
Salm,
Bay
Lake Tarpon
Sink
Map Location
LAKE TARPON
® Tributary Sampling Site
X Lake Sampling Site
* Sewage Treatment Facility
i 2 Km.
Scale 1 M1"
28*09'—J
28VH
28'OSH
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LAKE TARPON
STORE! NO. 1250
I. CONCLUSIONS
A. Trophic Condition:
Survey data indicate that Lake Tarpon is mesotrophic.
However, primary productivity in the lake may be inhibited
by the relatively high levels of chlorides resulting from the
previous inflows of saline water through the sinkhole on the
west side of the lake (see map, page v); the mean chloride
concentration in April of 1972 was 310 mg/1 (Hunn, 1974).
This lake ranked fifth in overall trophic quality when
the 41 Florida lakes sampled in 1973 were compared using a
combination of six parameters*. Seven of the lakes had less
median total phosphorus, 16 had less median dissolved phos-
phorus, none had less and two had the same median inorganic
nitrogen, four had less mean chlorophyll a_, and none had greater
mean Secchi disc transparency.
Survey limnologists noted that the lake was moderately clear
and slightly hurnic in color, and that emergent macrophytes were
growing along most of the shoreline.
B. Rate-Limiting Nutrient:
The algal assay results are not considered representative of
conditions in the lake at the time the sample was collected (03/
08/73). However, the lake data indicate nitrogen limitation at
all sampling stations and times.
* See Appendix A.
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2
C. Nutrient Controllability:
1. Point sources—The point-source phosphorus load is esti-
mated to have accounted for 15.3% of the total phosphorus load
reaching Lake Tarpon during the sampling year.
The sampling year phosphorus loading of 0.45 g/m2 is only
slightly greater than that proposed by Vollenweider (Vollenweider
and Dillon, 1974) as a eutrophic loading (see page 12). Phosphorus
control at the Lake Tarpon Mobile Home Village most likely would
help to maintain the present Lake Tarpon water quality.
2. Non-point sources—The gaged and ungaged tributaries con-
tributed an estimated 75.0% of the total phosphorus and 92.5% of
the total nitrogen inputs. South Creek contributed 4.5% of the
phosphorus and 5.6% of the nitrogen.
The ungaged area includes Brooker Creek that accounts for
most of the inflow (Hunn, 1974); and, therefore, the nutrient
loads contributed by this tributary may be greater than those
estimated for ungaged tributaries and immediate drainage.
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II. LAKE AND DRAINAGE BASIN CHARACTERISTICS1"
A. Morphometry :
1. Surface area: 10.25 kilometers2.
2. Mean depth: 2.5 meters.
3. Maximum depth: 4.6 meters.
4. Volume: 25.625 x 106 m3.
5. Mean hydraulic retention time: 189 days.
B. Tributary and Outlet:
(See Appendix C for flow data)
1. Tributaries -
Drainage Mean flow
Name area (km2)* (m3/sec)*
South Creek 8.8 0.08
Minor tributaries &
immediate drainage - 136.4 1.49
Totals 145.2 1.57
2. Outlet -
Irregular surface and ground 155.4 1.57
water flow** -
C. Precipitation***:
1. Year of sampling: 118.5 centimeters.
2. Mean annual: 138.6 centimeters.
t Table of metric equivalents...Appendix B.
tf Hunn, 1974.
* For limits of accuracy, see Working Paper No. 175, "...Survey Methods,
1973-1976".
** See page 8.
*** See Working Paper No. 175.
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4
III. LAKE WATER QUALITY SUMMARY
Lake Tarpon was sampled three times in 1973 by means of a pontoon-
equipped Huey helicopter. Each time, samples for physical and chemical
parameters were collected from three stations on the lake and from two
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 ^analysis. The
maximum depths sampled were 2.7 meters at station 1, 2.7 meters at station
2, and 2.1 meters at station 3.
\
The lake sampling results are presented in full in Appendix D and are
summarized in the following table.
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PARAMETER
TEMP (C)
DISS OXY (MG/L)
CN'DCTVY
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)
A. SUMMARY OF PHYSICAL AND
1ST SAMPLING ( 3/ 9/73)
3 SITES
CHEMICAL CHARACTERISTICS FOR LAKE TARPON
STORET CODE 1250
2ND SAMPLING ( 9/ 4/73)
3 SITES
RANGE
21.2 - 22.6
8.1 - 10.1
l^OO. - 1500.
6.9 - 7.9
10. - 10.
0.042 - 0.052
0.027 - 0.033
0.020 - 0.040
0.030 - 0.050
0.600 - 0.800
0.050 - 0.09o
0.620 - 0.830
0.8 - 28.7
2.1 - 2.5
3RO SAMPLING Ul/ 6/73)
3 SITES
MEAN
22.2
8.7
1425.
7.2
10.
0.046
0.029
0.025
0.039
0.65U
0.064
0.675
10.9
2.3
MEDIAN
22.4
8.4
1400.
7.1
10.
0.047
0.02d
0.020
0.04U
0.600
0.060
0.63b
3.2
2.1
RANGE
27.9
6.0
1768.
5.5
10.
0.020
0.010
0.040
0.050
0.600
0.090
0.650
3.5
2.8
- 28.2
7.0
- 1796.
6.0
12.
- 0.045
- 0.029
- 0.050
- 0.070
- 1.300
- 0.120
- 1.350
7.7
3.3
MEAN
28.0
6.6
1782.
5.7
10.
0.026
0.016
0.047
0.058
0.967
0.105
1.013
5.4
3.0
MEDIAN
27.9
6.6
1782.
5.7
10.
0.022
0.014
0.050
0.060
0.950
0.105
0.995
5.1
2.8
RANGE
22.9
7.2
1580.
5.9
10.
0.030
0.010
0.020
0.040
0.500
0.060
0.520
3.5
2.1
- 23.4
7.8
- 1586.
6.2
10.
- 0.046
- 0.045
- 0.030
- 0.050
- 0.800
- 0.070
- 0.820
4.7
2.7
MEAN
23.2
7.5
1584.
6.1
10.
0.034
0.021
0.023
0.043
0.671
0.066
0.694
4.3
2.3
MEDIAN
23.2
7.5
1585.
6.1
10.
0.030
0.017
0.020
0.040
0.700
0.070
0.720
4.6
2.1
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B. Biological characteristics:
1. Phytoplankton -
Sampling
Date
03/09/73
09/04/73
11/06/73
2. Chlorophyll a_ -
Sampling
Date
03/09/73
09/04/73
11/06/73
Dominant
Genera
1. Cryptomonas sp.
2. Dinobryon sp.
3. Flagellates
4. Cyclotella sp.
5. Kirchneriella sp.
Other genera
Total
1. Flagellates
2. Spermatozoopsis sp.
3. Closterium sp.
4. Dactylococcopsis s_p_.
5. Oscillatoria sp.
Other genera
Total
1. Flagellates
2. Chlamydomonas sp.
3. Dinoflagellates
4. Closterium sp.
5. Spermatozoopsis sp.
Other genera
Total
Station
Number
1
2
3
1
2
3
1
2
3
Algal Units
per ml
104
59
37
24
11
33
268
2,017
1,008
800
146
123
92_
4,186
7,315
481
289
289
241
288
8,903
Chlorophyll a
(yg/1)
3.2
0.8
28.7
7.7
5.1
3.5
4.6
3.5
4.7
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7
C. Limiting Nutrient Study:
Algal assay results are not considered representative of
conditions in the lake at the time the sample was collected
(03/08/73) because the growth of the alga appeared to be inhib-
ited, possibly by chlorides.
The lake data indicate nitrogen limitation at all sampling
stations and times; i.e., the mean inorganic nitrogen/orthophos-
phorus ratios were 9/1 or less, and nitrogen limitation would
be expected.
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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.
The Tarpon Lake basin is in a depression of the underlying limestone,
and the only known outlet was a shoreline sinkhole just south of Salmons
Bay (see map, page v). The sinkhole was encircled with an earthen dike
in May, 1969, to minimize lake-level fluctuations, and an outlet canal
leading south to Tampa Bay was completed in July, 1967 (Hunn, 1974).
However, the control gates have remained closed, and no drainage through
this outlet has been permitted (Anderson, 1975).
On a long-term basis, the outflow should equal the inflow (Anderson,
op. cit.), so in this report, the nutrient loads leaving the lake were
estimated using the sum of the inflows and the mean nutrient concentrations
in the lake. The average annual evaporation in this area is approximately
equal to rainfall, and little change in lake volume would be expected from
precipitation (Mann, 1971).
In this report, nutrient loads for sampled tributaries were determined
by using a modification of a U.S. Geological Survey computer program for
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9
calculating stream loadings*. Nutrient loads for unsampled "minor
tributaries and immediate drainage" ("ZZ" of U.S.G.S.) were estimated
using the nutrient loads, in kg/km2/year, at station A-l and multiplying
by the ZZ area in km2.
The operator of the Lake Tarpon Mobile Home Village wastewater treat-
ment plant did not participate; nutrient loads were estimated at 1.134 kg
P and 3.401 kg N/capita/year, and flow was estimated at 0.3785 mVcapita/
day.
See Working Paper No. 175.
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10
A. Waste Sources:
1. Known municipal* -
Name
Lake Tarpon
Mobile Home
village
Pop.
Served
620
Treatment
act. sludge
+ pond
Mean Flow
(m3/d)
234.7
2. Known industrial - None
Annual Total Phosphorus Loading - Average Year:
1. Inputs -
Source
a. Tributaries (non-point load) -
South Creek
kg P/
yr
210
b. Minor tributaries & immediate
drainage (non-point load) - 3,275
c. Known municipal STP's -
Lake Tarpon MHV
d. Septic tanks** -
e. Known industrial - none
f. Direct precipitation*** -
Total
Outputs -
Lake outlet**** -
705
5
450
4,645
1,830
Net annual P accumulation - 2,815 kg.
Receiving
Water
Lake Tarpon
% of
total
4.5
70.5
15.2
0.1
9.7
100.0
* Treatment plant questionnaire.
** Estimate based on 23 lakeshore dwellings; see Working Paper No. 175.
*** Brezonik and Shannon, 1971.
**** Estimated (see page 8).
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11
C. Annual Total Nitrogen Loading - Average Year:
1. Inputs -
kg N/ % of
Source y_r total
a. Tributaries (non-point load) -
South Creek 6,215 5.6
b. Minor tributaries & immediate
drainage (non-point load) - 96,300 86.9
c. Known municipal STP's -
Lake Tarpon MHV 2,110 1.9
d. Septic tanks* - 245 0.2
e. Known industrial - none
f. Direct precipitation** - 5.950 5.4
Total 110,820 100.0
2. Outputs -
Lake outlet*** - 38,520
3. Net annual N accumulation - 72,300 kg.
D. Non-point Nutrient Export by Subdrainage Area:
Tributary kg P/km2/yr kg N/km2/yr
South Creek 24 706
* Estimate based on 23 lakeshore dwellings; see Working Paper No. 175.
** Brezonik and Shannon, 1971.
*** Estimated (see page 8).
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12
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 oligo-
trophic 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 0.45 0.27 10.8 7.1
Vollenweider phosphorus loadings
(g/m2/yr) based on mean depth and mean
hydraulic retention time of Lake Tarpon:
"Dangerous" (eutrophic loading) 0.44
"Permissible" (oligotrophic loading) 0.22
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13
LITERATURE REVIEWED
Anderson, Warren, 1974. Personal communication (hydraulic char-
acteristics of Lake Tarpon). U.S. Geol. Surv., Winter Park.
Brezonik, Patrick L., and Earl E. Shannon, 1971. Trophic state of
lakes in north central Florida. Publ. No. 13, Water Resources
Res. Ctr., U. of FL, Gainesville.
Hunn, J. D., 1974. Hydrology of Lake Tarpon near Tarpon Springs,
Florida. Map Series 60, U.S. Geol. Surv., Tallahassee.
Mann, J. A., 1971. Hydrologic aspects of freshening upper Old Tampa
Bay, Florida. Information Circ. 76, FL Dept. of Nat. Resources,
Tallahassee.
Shannon, Earl E., and Patrick L. Brezonik, 1972. Relationships
between lake trophic state and nitrogen and phosphorus loading
rates. Env. Sci. & Techn. i (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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14
VI. APPENDICES
APPENDIX A
LAKE RANKINGS
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LAKE DATA TO BE USED IN RANKINGS
LAKE
CODE LAKc NAME
1201 ALLIGATOR LAKE
1202 LAKE APOPKA
1203 LAKE BANANA
1206 LAKE CRESCENT
120T DOCTORS LAKE
1208 LAKE DORA
1209 LAKE EFFIE
1210 LAKE GEORGE
1211 LAKE GIBSON
1212 GLENADA LAKE
1214 LAKE GRIFFIN
1215 LAKE HAINES
1217 LAKE HANCOCK
1219 LAKE HORSESHOE
1220 LAKE HOWELL
1221 LAKE ISTOKPOGA
1223 LAKE JESSUP
1224 LAKE KISSIMMEE
1227 LAKE LULU
1228 LAKE MARION
1229 LAKE MINNEHAHA
1230 LAKE HINNEOLA
1231 LAKE MONROE
1232 LAKE OKEECHOBEE
1234 LAKE POINSETT
1236 LAKE REEDY
1238 LAKE SOUTH
1239 LAKE TALOUIN
MEDIAN
TOTAL P
0.620
0.102
0.660
0.065
0.084
0.102
1.480
0.129
0.167
0.134
0.119
0.063
0.772
0.034
1.260
0.039
0.492
0.034
1.490
0.044
0.038
0.018
0.188
0.063
0.085
0.033
0.074
0.085
MEDIAN
INO«G N
0.260
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
0.150
0.330
0.130
0.290
500-
MEAN SEC
47s. 000
484.176
482.667
473.889
465.555
482.889
489.000
469.308
470.000
454.167
481.333
462.667
483.500
459.000
464.000
464.222
487.000
463.667
483.000
468.833
435.000
406.333
474.555
472.366
469.000
468.500
464.000
462.167
MEAN
CHLORA
87.733
46.611
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
10.600
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 ORTHO P
0.386
0.019
0.293
0.033
0.028
0.022
0.950
0.063
0.069
0.072
0.038
0.014
0.158
0.023
1.175
0.010
0.288
0.007
1.030
0.016
0.012
0.009
0.128
0.010
0.051
0.008
0.028
0.031
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LAKE DATA VO BE USED IN RANKINGS
LAKE
CODE LAKE NAME
1240 LAKE THONOTOSASSA
1241 LAKE TOHOPEKALIGA
1242 TROUT LAKE
1243 LAKE WEOHYAKAPKA
1246 LAKE YALE
1247 LAKE MUNSON
1248 LAKE SEMINOLE
1249 LAKE LAWNE
1250 LAKE TARPON
1252 LAKE ELOISE
1258 LAKE JESSIE
1261 EAST LAKE TOHOPEKALIGA
1264 PAYNE'S PRAIRIE LAKE (NO
MEDIAN
TOTAL P
0.695
0.246
1.110
0.041
0.027
1.475
0.234
2.560
0.041
0«486
0.051
0.042
1.260
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
466.167
472.917
472.000
458.667
441.000
486.667
473.833
494.667
400.889
465.333
452.667
440.833
476.000
MEAN
CHLORA
37.700
30.633
76.967
7.767
25.367
140.317
102.000
84.900
6.867
70.233
26.300
5.167
88.200
15-
HIN DO
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
MEDU
OISS ORTt
0.565
0.152
0.970
0.011
0.014
0.852
0.026
0.117
0.027
0.339
0.011
0.007
1.210
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PERCENT OF LAKES KITH HIGHER VALUES
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PERCENT OF LAKES WITH HIGHER VALUES (NUMBER OF LAKES WITH HIGHER VALUES)
LAKE
CODE LAKE NAME
12^0 LAKE THONOTOSASSA
1241 LAKE TOHOPEKALIGA
1242 TROUT LAKE
1243 LAKE WEOHYAKAPKA
1246 LAKE VALE
1247 LAKE HUNSON
1248 LAKE SEMINOLE
1249 LAKE LAWNE
1250 LAKE TARPON
1252 LAKE ELOISE
1258 LAKE JESSIE
1261 EAST LAKE TOHOPEKALIGA
1264 PAYNE'S PRAIRIE LAKE (NO
MEDIAN
TOTAL P
20 (
33 1
IS I
75 «
98 I
8 (
35 <
0 <
63 (
30 (
73 <
80 (
11 <
8)
13)
6)
30)
39)
3)
14)
0)
33)
12)
29)
32)
4)
MEDIAN
INORG N
85 1
40 I
8 1
91 1
58 1
5 (
48 (
0 I
98 '
50 i
68 i
98 I
65 <
1 34)
> 16)
I 3)
! 36)
! 23)
1 2)
1 19)
! 0)
I 38)
I 20)
t 35)
1 38)
1 26)
500-
MEAN SEC
58 1
38 1
43 1
83 1
90 <
8 1
35 I
0 I
100 i
63 1
88 i
93 1
25 i
1 23)
! 15)
1 17)
! 33)
I 36)
1 3)
! 14)
t 0)
1 40)
1 25)
1 35)
1 37)
1 10)
MEAN
CHLOHA
40
48
23
88
63
8
10
20
90
28
60
98
15
( 16)
( 19)
( 9)
< 35)
4 25)
( 3)
( 4)
< 8)
( 36)
( 11)
< 24)
t 39)
I 6)
15-
MIN DO
48
40
13
74
83
16
69
43
60
16
26
55
90
( 18)
( 16)
( 5)
( 29)
( 32)
( 6)
( 27)
( 17)
1 23)
( 6)
( 10)
< 22)
( 35)
MEDIAN
DISS OUT HO P
15 (
30 (
8 (
84 (
75 «
13 (
63 (
35 <
60 (
20 (
84 (
99 (
0 (
6)
12)
3)
33)
30)
5)
25)
14)
24)
8)
33)
39)
0)
INDEX
NO
266
229
110
495
467
58
260
98
491
207
419
523
206
-------
LAKES RANKED BY INDEX NOS.
RANK LAKE CODE LAKE NAME INDEX NO
I 1330 LAKE MINNEOLA . 579
2 1261 EAST LAKE TOHOPEKALIGA 523
3 1229 LAKE MINNEHAHA 517
4 1243 LAKE WEOHYAKAPKA 495
5 1250 LAKE TARPON 491
C 1221 LAKE ISTOKPOGA 477
7 1246 LAKE YALE 467
8 1224 LAKE KISSIMHEE 455
9 1258 LAKE JESSIE 419
10 1219 LAKE HORSESHOE 406
11 1215 LAKE HAINES 396
12 1238 LAKE SOUTH 386
13 1232 LAKE OKEECH08EE 368
14 1228 LAKE MARION 366
15 1206 LAKE CRESCENT 346
16 1234 LAKE POINSETT 342
17 1207 DOCTORS LAKE 341
18 1236 LAKE REEDY 337
19 1211 LAKE GIBSON 324
20 1208 LAKE DORA 297
21 1239 LAKE TALQUIN 294
22 1202 LAKE APOPKA 260
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 TOHOPEKALIGA 229
-------
LAKES RANKED BY INDEX NOS.
RANK LAKE CODE LAKE NAME INDEX NO
29 1231 LAKE MONROE . 215
30 1217 LAKE HANCOCK 213
31 1252 LAKE ELOISE 207
32 1264 PAYNE'S PRAIRIE LAKE (NO 206
33 1220 LAKE HOWELL 201
3* 1203 LAKE BANANA 200
35 1223 LAKE JESSUP 184
36 1201 ALLIGATOR LAKE 130
37 1242 TROUT LAKE 110
38 1249 LAKE LAWNE 98
39 1247 LAKE MUNSON 58
40 1227 LAKE LULU 34
41 1209 LAKE EFFIE 31
-------
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
-------
TRIBUTARY FLOW INFORMATION FOR FLGKlOA
8/35/75
LAKE CODE 1250
LAKE TARPON
TOTAL DRAINAGE AREA OF LAKE(SC) KM)
155.4
SUB-DKAINAGE
TRIBUTARY AREAfSQ KM)
1250A1
1250ZZ
8.8
136.2
JAN
0.04
0.79
FEB
0.06
1.02
MAR
0.12
2.27
APR
0.05
0.93
TOTAL DRAINAGE AREA OF LAKE =
SUM OF SUB-DRAINAGE AREAS =
MEAN MONTHLY FLOWS AND OAILY FLOWS(CMS)
TRIBUTARY MONTH YEAR Mf
1250A1
1250ZZ
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
1?
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
FLOW
0.02
0.02
0.01
0.01
0.01
0.01
0.03
0.01
0.01
0.04
0.02
0.01
0.15
0.18
O.CO
0.0
0.00
0.00
0.37
0.03
0.05
0.51
0.23
0.05
DAY
18
20
14
16
5
16
12
21
16
16
16
18
20
14
16
5
16
12
21
16
16
16
MAY
0.01
0.17
155.4
145.0
NORMALIZED FLOWS(CMS)
JUN JUL AUG
0.02
0.31
0.03
1.47
0.23
4.11
SEP
0.22
4.05
OCT
0.09
1.61
NOV
0.03
0.54
DEC
0.03
0.59
MEAN
0.08
1.49
SUMMARY
TOTAL FLOW IN
TOTAL FLOW OUT
18.85
0.0
FLOW DAY
0.01
0.01
0.01
0.01
0.01
0.05
0.01
0.02
0.02
0.02
0.01
0.07
0.00
0.0
0.0
0.00
0.59
0.01
0.11
0.25
0.13
0.05
FLOW DAY
FLOW
-------
APPENDIX D
PHYSICAL and CHEMICAL DATA
-------
STORE! RETRIEVAL DATE 75/08/25
12b001
28 03 19.0 082 43 23.0
LAKE TARPON
12103 FLORIDA
DATE
FROM
'TO
73/03/09
73/09/04
73/11/06
DATE
FROM
TO
73/03/09
73/09/04
73/11/06
TIME DEPTH
OF
DAY FEET
14 00 0000
14 00 0004
14 00 0007
09 55 0000
09 55 0009
09 11 0000
09 11 0001
09 11 0007
TIME DEPTH
OF
DAY FEET
14 00 0000
14 00 0004
14 00 0007
09 55 0000
09 55 0009
09 11 0000
09 11 0007
00010
WATER
TEMP
CENT
22.6
22.6
22.5
27.9
27.9
22.9
22.9
22.9
00665
PHOS-TOT
MG/L P
0.046
0.052
0.049
0.030
0.023
0.046
0.041
00300
DO
MG/L
10.
8.
8.
6.
6.
7.
7.
32217
1
4
4
6
0
4
2
00077 00094
TRANSP CNDUCTVY
SECCHI FIELD
INCHES MICROMHO
84 1400
1400
1400
110 1768
1768
84 1585
158S
1583
11EPALES 2111202
3 0011 FEET DEPTH
00400 00410 00610 00625 00630
Pri T ALK NH3-N
CAC03 TOTAL
SU MG/L MG/L
7.40 10K 0
7.50 10K 0
7.90 10K 0
5.50 10K 0
6.00 10K 0
6.00 10K 0
6.00 10K . 0
.040
.030
.030
.070
.050
.050
.040
TOT
N
KJEL
MG/L
0
0
0
1
0
0
0
.800
.600
.700
.300
.800
.700
.500
N02&N03
N-TOTAL
MG/L
0.030
0.020
0.020
0.050
0.040
0.020
0.030
00671
PHOS-DIS
ORTHO
MG/L P
0.028
0.028
0.02S
0.029
0.014
0.045
0.035
CHLRPHYL
A
UG/L
3.
7.
4.
2
7
6
K VALUE KNOtfN TO tJE
LESS THAN INDICATED
-------
STORET RETRIEVAL DATE 75/08/25
125002
28 06 31.0 082 43 34.0
LAKE TARPON
12103 FLORIDA
11EPALES
DATE
FROM
TO
73/03/09
73/09/04
73/11/06
DATE
FROM
TO
73/03/09
73/09/04
73/11/06
TIME DEPTH
OF
DAY FEET
14 40 0000
14 40 0004
14 40 0009
10 25 0000
10 25 0009
09 25 0000
09 25 0004
09 25 0009
TIME DEPTH
OF
DAY FEET
14 40 0000
14 40 0004
14 40 0009
10 25 0000
10 25 0009
09 25 0000
09 25 0004
09 25 0009
00010
WATER
TEMP
CENT
22.3
22.1
22.1
28.0
27.9
23.2
23.2
23.1
00665
PHOS-TOT
MG/L P
0.048
0.043
0.042
0.020
0.045
0.030
0.030
0.030
00300
DO
MG/L
8.5
8.5
7.0
6.6
7.6
7.8
32217
CHLRPHYL
A
UG/L
0.8
5.1
3.5
00077 00094
TRANSP CNDUCTVY
SECCHI FIELD
INCHES M1CROMHO
98 1400
1400
1400
112 1784
1780
108 1581
1580
1580
3
00400
PH
SU
7
7
7
5
5
6
6
5
.10
.10
.20
.50
.70
.20
.10
.90
00410
T ALK
CAC03
MG/L
10K
10K
10K
10K
10K
10K
10K
10K
2111202
0013
00610
NH3-N
TOTAL
MG/L
0.040
0.040
0.040
0.060
0.060
0.050
0.040
0.040
FEET DEPTH
00625
TOT KJEL
N
MG/L
0.700
0.600
0.600
1.200
1.100
0.800
0.5QO
0.600
00630
N02&N03
N-TOTAL
MG/L
0.020
0.020
0.020
0.050
0.040
0.020
0.020
0.030
00671
PHOS-DIS
ORTHO
MG/L P
0.028
0.027
0.028
0.010
0.014
0.017
0.013
0.019
K VALUE KNOWN TO BE
LESS THAN INDICATED
-------
STORE! RETRIEVAL DATE 75/08/2b
125003
28 05 20.0 082 *2 *0.0
LAKE TARPON
12103 FLORIDA
DATE TIME DEPTH
FROM OF
TO DAY FEET
73/03/09 15 05 0000
15 05 0005
73/09/0* 11 00 0000
11 00 0007
73/11/06 09 38 0000
09 38 0001
09 33 0005
DATE TIME DEPTH
FROM OF
TO DAY FEET
73/03/09 15 05 0000
15 05 0005
73/09/0* 11 00 0000
11 00 0007
73/11/06 09 38 0000
09 38 0005
G0010
WATER
TEMP
CENT
22.6
21.2
28.2
28.1
23. *
23.*
23.*
00665
PHOS-TOT
MG/L P
0.0**
0.0*6
0.021
0.020
0.030
0.030
llEPALhS 2111202
3 0009 FEET DEPTH
00300 00077 0009* 00*00 00*10 00610 00625 00630 00671
DO TRANSP CNDUCTVY Ph T ALK NH3-N TOT KJEL N02<*N03 PHOS-OIS
SECCHI FIELD CAC03 TOTAL N N-TOTAL ORTHO
MG/L INCHES MICROMHO SO MG/L MG/L MG/L MG/L MG/L P
e.i
6.8
6.b
7.*
7.6
32217
ChLRPHYL
A
UG/L
28.7
3.5
*.7
6* 1500 6.90
1500 6.90
126 1796 5.70
179* 5.80
8* 1586 6.20
1586
1586 6.20
10K 0.0*0 0.600 0.030 0.031
10K 0.050 0.600 0.0*0 0.033
10 0.060 0.800 0.050 0.015
12 0.050 0.600 0.050 0.01*
10K 0.0*0 0.800 0.020 0.010
10K 0.0*0 0.800 0.020 0.010
K VALUE KNOWN TO BE
LESS THAN INDICATED
-------
APPENDIX E
TRIBUTARY AND WASTEWATER
TREATMENT PLANT DATA
-------
STORET RETRIEVAL DATE 75/08/25
1250A1
28 04 33.0 082 43 00.0
SOUTH CREEK
12095 7.5 OLDSMAR
I/LAKE TARPON
LAKE ttR. AT ST HWY 584 8RDG
11EPALES 2111204
4 0000 FEET DEPTH
DATE TIME DEPTH N02&N03
FROM OF
TO DAY FEET
73/03/18 13 20
73/05/20 14 30
73/06/14 16 30
73/07/16 16 20
73/09/16
73/10/12
73/11/21
73/12/16
74/01/16 18 00
74/02/16
0630
&N03
OTAL
IG/L
0.025
0.029
0.010K
0.020
0.050
0.035
0.016
0.036
0.068
00625
TOT KJEL
N
MG/L
1.380
1.000
1.915
5.000
3.700
2.700
1.500
2.400
1.500
1.700
00610
NH3-N
TOTAL
MG/L
0.140
0.140
0.091
0.315
0.210
0.174
0.096
0.112
0.068
0.085
00671
PHOS-DIS
ORTHO
MG/L P
0.036
0.010
0.019
0.008
0.050
0.052
0.028
0.052
0.035
00665
PHOS-TOT
MG/L P
0.075
0.050
0.040
0.030
0.085
0.085
0.035
0.040
0.250
0.095
K VALUE KNOWN TO BE
LESS THAN INDICATED
------- |