U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
LAKE MINNEHAHA
ORANGE OOUf-flY
FLORIDA
EPA REGION IV
WORKING PAPER No, 2b5
CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
T^G.P.O. 699-440
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- REPORT
O
ON
LAKE MINNEHAHA
§ ORANGE COUNTY
£ FLORIDA
§ EPA REGION IV
^ WORKING PAPER No,
UlTH THE COOPERATION OF THE
FLORIDA DEPARTMENT OF ENVIRONMENTAL REGULATION
AND THE
FLORIDA NATIONAL GUARD
DECEMBER,, 1977
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CONTENTS
Page
Foreword ii
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 12
VI. Appendices 13
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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 v/atersheds.
j'
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)"j, 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, U. 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
Haines
Hancock
Horseshoe
Howe!1
Istokpoga
Jessie
Jessup
Kissimmee
Lawne
Lulu
Marion
Minnehaha
Minneola
Monroe
Munson
Okeechobee
Poinsett
Reedy
Seminole
Seminole
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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LAKE MINNEHAHA
Tributary Sampling Site
X Lake Sampling Site
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LAKE MINNEHAHA
STORE! NO.1229
I. CONCLUSIONS
A. Trophic Condition:
Survey data indicate that Lake Minnehaha is rnesotrophic.
It ranked third in overall trophic quality when the 41 Florida
lakes sampled in 1973 were compared using a combination of six
parameters*. Five of the lakes had less median total phosphorus,
eight had less median dissolved phosphorus, four had less and one
had the same median inorganic nitrogen, six had less mean chloro-
phyll aj, and only two had greater mean Secchi disc transparency.
Survey limnologists observed submerged and emergent macro-
phytes, and blue-green algae were prominent in all of the phyto-
plankton samples.
B. Rate-Limiting Nutrient:
There was a significant change in nutrient concentrations
in the algal assay sample during shipment from the field to
the laboratory, and the assay results are not representative
of conditions in the lake at sampling time. The lake data
indicate nitrogen limitation; i.e., the mean inorganic nitro-
gen to orthophosphorus ratios were 10 to 1 or less at all
sampling times.
C. Nutrient Controllability:
1. Point sources—No known municipal or industrial point
sources impacted Lake Minnehaha during the sampling year. Septic
* See Appendix A.
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2
tanks serving lakeshore dwellings were estimated to have con-
tributed about 6% of the total phosphorus and 14% of the total
nitrogen inputs to the lake, but a shoreline survey would be
necessary to determine the significance of those sources.
The sampling year phosphorus loading of 0.63 g/m2 is only
slightly less than that proposed by Vollenweider (Vollenweider
and Dillon, 1974) as a eutrophic loading, and although Florida
lakes may assimilate phosphorus at somewhat higher levels than
those suggested by Vollenweider (see page 11), because of the
increasing urbanization in the drainage area (see below), it is
likely that Lake Minnehaha eventually will become eutrophic.
2. Non-point sources--The estimated non-point contributions
accounted for essentially all of the phosphorus load during the
sampling year, although the quantities of the inputs were rela-
tively low.
The 1970 photorevised U.S.G.S. Casselberry quadrangle map
shows a considerable increase in urban areas in the drainage in
the eight years since the map originally was prepared. If urban-
ization continues as in the past, the eutrophic loading will be
exceeded.
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II. LAKE AND DRAINAGE BASIN CHARACTERISTICS*
A. Morphometry ':
1. Surface area: 0.39 kilometers2.
2. Mean depth: 3.0 meters.
3. Maximum depth: 4.0 meters.
4. Volume: 1.170 x 106 m3.
5. Mean hydraulic retention time: 97 days.
B. Tributary and Outlet:
(See Appendix C for flow data)
1. Tributaries -
Drainage Mean flow
Name area (km2)* (m3/sec)*
Unnamed Creek B-l 2.1 0.06
Minor tributaries &
immediate drainage - 1.8 0.08
Totals 3.9 0.14
2. Outlet -
Unnamed Creek A-l 4.3** 0.14
C. Precipitation***:
1. Year of sampling: 123.5 centimeters.
2. Mean annual: 130.5 centimeters.
r Table of metric conversions—Appendix B.
l-t Wegner, 1967.
* 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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4
III. WATER QUALITY SUMMARY
Lake Minnehaha 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 one or more depths at
a single station on the lake (see map, page v). During each visit,
a single depth-integrated (near bottom to surface) sample was collected
for phytoplankton identification and enumeration, and a similar sample
was taken for chlorophyll a_ analysis. During the first visit, a single
18.9-liter depth-integrated sample was taken for algal assays. The
maximum depth sampled was 2.1 meters.
The 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)
CNDCTVY (MCROMO)
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)
INOPG N (MG/L)
TOTAL N (MG/L)
CHLR°YL A (UG/L)
SECCHI (METERS)
A. SUMMARY OF PHYSICAL AND
1ST SAMPLING ( 3/14/73)
1 SITEb
CHEMICAL CHARACTERISTICS FOR LAKE MINNEHAHA
STORET CODE 1229
2ND SAMPLING ( 9/ 5/73)
1 SITES
RANGE
23.4 - 25.9
7.3 - 9.1
180. - 180.
8.3 - 9.0
42. - 42.
0.034 - 0.048
0.006 - 0.012
0.030 - 0.040
0.030 - 0.050
0.500 - 0.700
0.060 - 0.090
0.530 - 0.740
6.8 - 6.8
2.5 - 2.5
3RD SAMPLING 111/ 5/73)
1 SITES
MEAN
24. b
8.2
IbO.
8.7
42.
0.039
0.008
0.037
0.040
O.S67
0.077
0.603
6.6
2.5
MEUIAN
25.1
8.2
180.
8.9
42.
0.035
O.OOb
0.04U
0.040
0.500
0.080
0.540
6.8
2.b
RANGE
30.2
7.8
192.
8.0
39.
0.022
0.013
0.050
0.050
1.200
0.100
1.250
11.9
1.4
- 30.2
7.8
- 192.
8.0
39.
- 0.022
- 0.013
- 0.050
- 0.050
- 1.200
- 0.100
- 1.250
- 11.9
1.4
MEAN
30.2
7.8
192.
8.0
39.
0.022
0.013
0.050
0.050
1.200
0.100
1.250
11.9
1.4
MEDIAN
30.2
7.8
192.
a.o
39.
0.022
0.013
0.050
0.050
1.200
0.100
1.250
11.9
1.4
RANGE
23.5
8.8
US.
7.4
40.
0.041
0.025
0.030
0.040
0.500
0.070
0.530
7.5
1.0
- 24.2
8.8
- 177.
7.7
44.
- 0.146
- 0.117
- 0.040
- 0.040
- 0.600
- 0.080
- 0.640
7.5
1.0
MEAN
23.8
8.8
176.
7.5
42.
0.093
0.071
0.035
0.040
0.550
0.075
0.585
7.5
1.0
MEDIAN
23.8
8.8
176.
7.5
42.
0.093
0.071
0.035
0.040
0.550
0.075
0.585
7.5
1.0
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B. Biological characteristics:
1. Phytoplankton -
Sampling
Date
03/14/73
09/05/73
11/05/73
2. Chlorophyll a^ -
Sampling
Date
03/14/73
09/05/73
11/05/73
Dominant
Genera
1. Raphidiopsis sp.
2. Golenkinia sp.
3. Kirchneriella sp.
4. Tetraedron sp.
5. Flagellates
Other genera
Total
1.
2.
3.
4.
5.
6.
Oscillatoria sp.
Dactylococcopsis sp.
Lyngbya S£.
Tetraedron sp.
Flagellates
Scenedesmus sp.
Other genera
Total
1. Oscillatoria sp.
2. Dactylococcopsis sp_.
3. Flagellates
4. Kirchneriella sp.
5. Chroococcus sp_.
6. Microcystis sp_.
Other genera
Total
Station
Number
1
1
1
Algal units
per ml __
1,899
669
524
307
271
1,285
4,955
15,977
10,107
1,251
1,059
866
673
3,851
33,784
9,529
7,123
1,925
1,251
963
963
6.352
28,106
Chlorophyll
(ug/D
6.8
11.9
7.5
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7
C. Limiting Nutrient Study:
There was a significant change in nutrient concentrations
in the algal assay sample between the time of collection and
the beginning of the assay, and the results are not representa-
tive of conditions in the lake at the time the sample was col-
lected (03/14/73). The lake data indicate nitrogen limitation;
i.e., the mean inorganic nitrogen to orthophosphorus ratios were
10 to 1 or less each sampling time.
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8
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" ("ZZ" 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 ZZ area in km2.
No known point sources impacted Lake Minnehaha during the Survey
sampling year.
A. Waste Sources**:
1. Known municipal - None
2. Known industrial - None
* See Working Paper No. 175.
** Stuart, 1976.
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9
B. Annual Total Phosphorus Loading - Average Year:
1. Inputs -
kg P/ % of
Source yr total
a. Tributaries (non-point load) -
Unnamed Creek B-l 115 46.9
b. Minor tributaries & immediate
drainage (non-point load) - 100 40.9
c. Known municipal STP's - None
d. Septic tanks* - 15 6.1
e. Known industrial - None
f. Direct precipitation** - 15 6.1
Total 245 100.0
2. Outputs -
Lake outlet - Unnamed Creek A-l 185
3. Net annual P accumulation - 60 kg.
* Estimate based on 51 lakeshore dwellings; see Working Paper No. 175.
** Brezonik and Shannon, 1971.
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10
C. Annual Total Nitrogen Loading - Average Year:
1. Inputs -
kg N/ % of
Source yr total
a. Tributaries (non-point load) -
Unnamed Creek B-l 1,750 43.5
b. Minor tributaries & immediate
drainage (non-point load) - 1,500 37.3
c. Known municipal STP's - None
d. Septic tanks* - 545 13.6
e. Known industrial - None
f. Direct precipitation** - 225 5.6
Total 4,020 100.0
2. Outputs -
Lake outlet - Unnamed Creek A-l 3,855
3. Net annual N accumulation - 165 kg.
D. Non-point Nutrient Export by Subdrainage Area:
Tributary kg P/km2/yr . kg N/km2/yr
Unnamed Creek B-l 55 833
* Estimate based on 51 lakeshore dwellings; see Working Paper No. 175.
** Brezonik and Shannon, 1971.
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11
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 meso-
trophic 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 0.63 0.15 10.3 0.4
Vollenweider phosphorus loadings
(g/m.2/yr) based on estimated mean depth and
hydraulic retention time of Lake Minnehaha:
"Dangerous" (eutrophic loading) 0.64
"Permissible" (oligotrophic loading) 0.32
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12
V. LITERATURE REVIEWED
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.
Stuart, Tim S., 1976. Personal communication (no known point sources
impact Lake Minnehaha). FL Dept. of Env. Reg., Tallahassee.
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.
Wegner, William, 1967. Clermont chain of lakes. Central Florida
Region Fish Management Area. Progress report submitted to the
Florida Game & Fresh Water Fish Commission, Tallahassee.
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VI. APPENDICES
13
APPENDIX A
LAKE RANKINGS
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LAKE DATA TO BE USED IN RANKINGS
LAKE
CODE LAKE NAME
1301 ALLIGATOR LAKE
1202 LAKE APOPKA
1203 LAKE BANANA
1206 LAKE CRESCENT
1207 DOCTORS LAKE
1208 LAKE DORA
1209 LAKE EFFIE
1210 LAKE 3EORGE
1211 LAKE GIBSON
1212 GLENAOA 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 MINNEOLA
1231 LAKE MONROE
1232 LAKE OKEECH08EE
1234 LAKE POINSETT
1236 LAKE REEDV
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
K260
0.039
0.492
0.034
1.490
0.044
0.038
0.018
0.188
0.063
0.085
0.033
0.074
o.oas
MEDIAN
INOWG 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
0.2.90
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
474.000
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 00
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 OHTHO 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 TO BE USED IN RANKINGS
LAKE
CODE LAKE NAME
!2<>o 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
12S2 LAKE ELOISE
1258 LAKE JESSIE
1261 EAST LAKE TOHOPEKALIGA
PAYNE'S PRAIRIE LAKE (NO
MEDIAN
TOTAL P
0.695
0.246
1.110
0.047
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
0.1*0
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
SB. 200
15-
MIN 00
10.200
10.500
12.900
a. 200
7.600
12.200
8.600
10.400
9.000
12.200
10.800
9.400
7.400
MEDIAN
DISS ORTHO P
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 WITH HIGHER VALUES (NUMBER OF LAKES NlTH HIGHER VALUES)
LAKE
CODE LAKE NAME
1201 ALLIGATOR LAKE
1202 LAKE APOPKA
1203 LAKE BANANA
1206 LAKE CRESCENT
1207 DOCTORS LAKE
1208 LAKE DORA
1209 LAKE EFFIE
1210 LAKE GEORGE
1211 LAKE GIBSON
1212 GLENAOA LAKE
121* LAKE GRIFFIN
1215 LAKE HAINES
1217 LAKE HANCOCK
1219 LAKE HORSESHOE
1220 LAKE HOWELL
1221 LAKE ISTOKPOGA
1223 LAKE JESSUP
122<> LAKE KISSIHHEE
1227 LAKE LULU
1228 LAKE MARION
1229 LAKt MINNEHAHA
1230 LAKE MINNEOLA
1231 LAKE MONROE
1232 LAKE OKEECHOBEE
1234 LAKE POINSETT
1236 LAKE REEOV
1238 LAKE SOUTH
1239 LAKE TALOUIN
MEDIAN
TOTAL P
25 (
50 (
23 (
65 (
60 (
53 (
5 (
45 <
40 (
43 (
48 (
70 (
18 <
93 (
11 (
85 (
28 '(
90 (
3 (
78 (
88 (
100 I
38 (
68 (
58 (
95 (
63 (
55 (
10)
20)
9)
26)
24)
21)
2)
18)
16)
17)
19)
28)
7)
37)
4)
34)
in
36)
1)
3D
35)
40)
15)
27)
23)
38)
25)
22)
MEDIAN
INORG N
29 1
38 (
29 1
70 (
76 1
35 1
10 1
54 1
81 1
54 1
29 1
81 1
43 \
70 1
23 1
76 (
18 1
63 1
3 (
29 1
91 I
98 (
15 I
45 i
60 i
13 I
70 <
20 i
( 10)
I 15)
! 10)
1 27)
: 3o>
; 14)
[ 4)
1 21)
[ 32)
! 21)
; io>
1 32)
I 17)
I 27)
1 9)
1 30)
1 7)
! 25)
1 1)
1 10)
1 36)
! 38)
I 6)
1 18)
1 24)
I 5)
( 27)
I 8)
500-
MEAN SEC
30
10
20
33
60
IB
3
48
45
85
23
75
13
80
69
65
5
73
15
53
95
98
28
40
50
55
69
78
( 12)
( 4)
( 8)
( 13)
( 24)
( 7)
( 1)
( 19)
( 18)
( 34)
( 9)
( 30)
( 5)
( 32)
( 27)
( 26)
( 2)
( 29)
( 6)
( 21)
(38)
( 39)
( 11)
( 16)
( 20)
( 22)
( 27)
( 31)
MEAN
CHLORA
18 I
38 I
5 1
80 1
55 1
33 1
3 1
43 1
70 1
53 1
30 1
58 1
13 I
78 (
35 I
93 I
25 i
65 i
0 i
50
85
100
75
73
95
45
68
83
1 7)
1 15)
! 2)
I 32)
1 22)
I 13)
I 1)
1 17)
1 28)
1 21)
I 12)
[ 23)
I 5)
1 31)
1 14)
I 37)
1 10)
I 26)
1 0)
I 20)
( 34)
I 40)
I 30)
( 29)
I 38)
( 18)
( 27)
I 33)
15-
MIN 00
10 (
74 <
100 (
48 (
34 (
90 (
0 (
23 I
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)
0)
9)
18)
1)
38)
12)
39)
8)
23)
27)
32)
26)
3)
32)
31)
35)
10)
21)
12)
12)
23)
2)
MEDIAN INDEX
OISS OftTHO P NO
18
70
23
50
56
68
10
43
40
38
48
78
28
65
3
89
25
99
5
73
80
93
33
89
45
95
56
S3
( 7)
( 28)
( 9)
( 20)
( 22)
( 27)
( 4)
( 17)
( 16)
( 15)
( 19)
( 31)
< ID
( 26)
( 1)
( 35)
( 10)
( 3.9)
( 2)
( 29)
( 32)
( 37)
( 13)
( 35)
( 18)
( 38)
I 22)
( 21)
1JO
280
200
346
341
297
31
256
324
276
273
396
213
406
201
477
184
4a5
34
366
517
579
215
368
342
337
386
294
-------
PERCENT Or LAKES WITH HIGHER VALUES (NUMBER OF LAKES WITH HIGHER VALUES)
LAKE
CODE LAKE NAME
1240 LAKE THONOTOSASSA
1241 LAKE TOHOPEKALIGA
12*2 TROUT LAKE
1243 LAKE WEOHYAKAPKA
1246 LAKE TALE
1247 LAKE MUNSON
1248 LAKE SEHINOLE
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 ( 8)
33 < 13>
IS ( 6)
T5 ( 30)
98 ( 39)
8 ( 3)
35 ( 14)
0 ( 0)
83 ( 33)
30 ( 12)
73 ( 29)
80 ( 32)
11 < 4)
MEDIAN
INORG N
85 (
40 <
8 (
91 (
58 (
5 (
48 (
0 (
98 (
SO (
ae (
98 (
65 (
34)
16)
3)
36)
23)
2)
19)
0)
38)
20)
35)
38)
26)
SCO-
MEAN SEC
58 I
38 (
43 (
83 (
90 (
8 (
35 (
0 (
100 (
63 (
88 (
93 (
25 (
23)
15)
17)
33)
36)
3)
14)
0)
40)
25)
35)
37)
10)
MEAN
CHLORA
40 (
48 (
23 (
88 (
63 (
a (
10 I
20 (
90 (
28 (
60 (
98 (
IS (
16)
19)
9)
35)
25)
3)
4)
8)
36)
11)
24)
39)
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)
23)
6)
10)
22)
35)
MEDIAN
OISS ORTHO 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 BT INDEX NOS.
RANK LAKE CODE LAKE NAME INDEX NO
1 1330 LAKE HINNEOLA . 579
2 1261 EAST LAKE TOHOPEKALIGA 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
II 1215 LAKE HAINES 396
12 1238 LAKE SOUTH 366
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 , 280
23 1212 GLENADA LAKE 276
24 1214 LAKE GRIFFIN 273
25 1240 LAKE THONOTOSASSA 266
26 1248 LAKE SEMIMOLE 260
27 1210 LAKE GEORGE 256
28 1241 LAKE TOHOPEKALIGA 229
-------
LAKES RANKED ar INDEX NOS,
RANK LAKE CODE LAKE NAME INDEX NO
29 1231 LAKE MONROE 215
30 1317 LAKE HANCOCK 213
31 1252 LAKE ELOISE 207
32 1264 PAYNE'S PRAIRIE LAKE (NO 206
33 1220 LAKE HQWELL 201
34 1203 LAKE BANANA 200
35 1223 LAKE JESSUP 164
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 FLORIDA
8/25/75
LAKE CODE 1239
LAKE MINNEHAHA
TOTAL ORAINAGE AREA OF LAKE(SO KM)
SUB-DRAINAGE
TRIBUTARY AREAtSQ KM)
4o3
NORMALIZED FLOWS(CMS)
1229A1
1229B1
1229ZZ
2.1
3»9
JAN
0.13
0.05
0.07
FE8
0.14
0.06
0.09
MAR
0.20
0.08
0.12
APR
0.07
0.03
0.03
MAY
0.03
0.02
0.01
JUN
0.09
0.04
0.05
JUL
0=17
0.07
0.11
AUG
0.26
0.10
0.15
SEP
0.33
0.12
Oo21
OCT
0.18
Oo07
0.10
NOV
OoOS
0.04
Oo04
DEC
0.06
0.03
0.03
MEAN
0.14
0.06
0.08
MEAN MONTHLY FLOWS AND OAILY FLOWS(CMS)
TRIBUTARY MONTH YEAR MEAN FLOW DAY
1229A1
1229B1
1229ZZ
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
7*
74
0.12
0.05
0.02
0.05
0.25
0.41
1.38
0.22
0.04
0.04
0.05
0.08
0.05
0.03
0.02
0.03
0.09
0.15
0.47
0.08
0.02
0.02
0.03
0.04
0.07
0.02
0.00
0.02
0.15
0.26
0.91
0.13
0.01
0.01
0.02
0.04
17
7
13
17
7
4
8
3
b
12
15
17
7
13
17
7
4
6
3
8
12
15
17
7
13
17
7
4
8
3
8
12
15
0.04
0.05
0.04
0.03
(1.03
0.02
0.02
0.03
0.23
0.31
0.03
0.02
0.03
0.03
0.02
0.02
0.00
0.01
0.02
U.<*3
0.58
0.02
0.01
0.02
0.02
SUMMARY
TOTAL DRAINAGE AREA OF LAKE = 4.3
SUM OF SUB-DRAINAGE AREAS = 6.0
TOTAL FLO* IN
TOTAL FLOW OUT
1«74
1.74
FLOW DAY
0.05
0.05
0.02
0.03
0.05
0.66
0.89
FLOW DAY
FLOW
15
0.03
15
0.02
15
0.01
-------
APPENDIX D
PHYSICAL and CHEMICAL DATA
-------
STORE! RETRIEVAL DATE 75/08/25
133901
28 37 54.0 081 21 20.0
LAKE MINNEHAHA
12095 FLORIDA
DATE
FROM
TO
73/03/14
73/09/05
73/11/05
TIME DEPTH
OF
DAY FEET
16 00 0000
16 00 0004
16 00 0007
14 55 0000
12 45 0000
12 45 0006
00010
WATER
TEMP
CENT
25.9
25.1
23.4
30.2
24.2
23.5
00300 00077 00094
DO TRANSP CNDUCTVY
SECCHI FIELD
MG/L INCHES MICROMHO
9.1
7.3
7.8
8.8
100
55
40
180
180
180
192
177
175
11EPALES
3
00400
PH
SU
9.00
8.90
8.30
8.00
7.40
7.70
00410
T ALK
CAC03
MG/L
42
42
42
39
44
40
2111202
0013
00610
NH3-N
TOTAL
MG/L
0.050
0.030
0.040
0.050
0.040
0.040
FEET DEPTH
00625
TOT KJEL
N
MG/L
0.700
0.500
0.500
1.200
0.600
0.500
00630
N02&N03
N-TOTAL
MG/L
0.040
0.030
0.040
0.050
0.040
0.030
00671
PHOS-DIS
ORTHO
MG/L P
0.012
0.006
0.006
0.013
0.025
0.117
00665 32217
DATE TIME DEPTH PHOS-TOT CHLRPHYL
FROM OF A
TO DAY FEET MG/L P UG/L
73/03/14
73/09/05
73/11/05
16
16
16
14
12
12
00
00
00
55
45
45
0000
0004
0007
0000
0000
0006
0.
0,
0.
0.
0.
0.
.035
.034
.048
.022
.041
.146
6.
11.
7.
8
9
5
-------
APPENDIX E
TRIBUTARY DATA
-------
STORE! RETRIEVAL DATE 75/08/25
1229A1
28 37 30.0 081 21 30.0
UNNAMED TRI8
12105 7.5 CASSELBERRY
0/LAKE MINNEHAHA
HORATIO AVE BROG IN MAITLANO
HEPALES 2111204
4 0000 FEET
DEPTH
DATE TIME DEPTH N02&N03
FROM OF
TO DAY FEET
73/03/17
73/04/07
73/05/13
73/06/17
73/07/07
73/08/04
73/09/08
73/11/03
73/12/08
73/12/15
74/01/12
74/02/15
14 05
11 40
10 45
09 45
10 40
10 30
13 45
14 20
09 30
09 15
10 30
14 10
0630
'&N03
OTAL
IG/L
0.010*
0.030
0.010K
0.021
0.040
0.024
0.017
0.038
0.096
0.068
0.028
0.008
00625
TOT KJEL
N
MG/L
0.660
1.570
0.630
0.700
0.720
0.690
0.940
0.600
0.600
0.600
1.100
00610
NH3-N
TOTAL
MG/L
0.025
0.075
0.035
0.072
0.035
0.110
0.110
0.082
0.072
0.064
0.032
0.010
00671
PHOS-DIS
ORTHO
MG/L P
0.007
0.011
0.009
0.021
0.008
0.013
0.021
0.066
0.020
0.020
0.010
0.005K
00665
PHOS-TOT
MG/L •»
0.035
0.055
0.050
0.030
0.040
0.025
0.040
0.055
0.035
0.035
0.035
-------
STORET RETRIEVAL DATE 75/08/35
DATE TIME DEPTH N02&N03
FROM OF
TO DAY FEET
73/03/17
73/04/07
73/05/13
73/06/17
73/07/07
73/08/04
73/09/08
73/11/03
73/12/08
73/12/15
74/01/12
74/02/15
14 20
11 35
10 40
09 40
10 15
11 00
14 00
14 15
09 35
09 20
10 30
14 50
1229B1
28 3d 00.0 081 21 00.0
UNNAMED TR1B
12 7.5 CASSELBERRY
I/LAKE MINNEHAHA
FROM LOT DUTY RD ALONG STREAM
11EPALES 2111204
4 0000 FEET DEPTH
0630
&N03
OTAL
G/L
0.096
0.092
0.095
0.04B
0.064
0.038
0.063
0.132
0.224
0.206
0.224
0.004
00625
TOT KJEL
N
MG/L
0.480
1.890
0.270
0.460
0.600
0.580
0.770
0.700
0.600
1.100
0.700
1.500
00610
NH3-N
TOTAL
MG/L
0.048
0.200
0.025
0.033
0.110
0.070
0.060
0.100
0.036
0.036
0.032
0.010
00671
PHOS-DIS
ORTHO
MG/L P
0.028
0.019
0.018
0.022
0.017
0.015
0.021
0.084
0.088
0.080
0.032
0.005K
00665
PHOS-TOT
MG/L P
0.045
0.030
0.030
0.025
0.035
0.035
0.035
0.115
0.145
0.120
0.065
0.030
------- |