U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
DOCTORS LAKE
CLAY COUNT/
FLORim
EPA REGION IV
WORKING PAPER No, 247
CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
•&G.P.O. 699-440
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c
• •-*-.»
V< '
REPORT
ON
v- DOCTORS LAKE
£ CLAY COUNTY
^ FLORIDA
EPA EGION IV
WORKING PAPER No, 247
WITH THE COOPERATION OF THE
FLORIDA DEPARTMENT OF ENVIRONMENTAL REGULATION
AND THE
FLORIDA NATIONAL GUARD
OCTOBER, 1977
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CONTENTS
Page
l~o reward ii
List of Florida Study 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
F 0 R F: V! 0 R U
The National F.utrophi cation Survey w&s initiated in 1972 in
response to an Administration commitment to investigate the nation-
wide threat of accelerated eutrophication to fresh water 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 arid 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 [§3H(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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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
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
Howe!1
Istokpoga
Jessie
Jessup
Kissimmee
Lawne
Lulu
Marion
Minnehaha
Minneola
Monroe
Munson
Okeechobee
Poinsett
Reedy
Seminole
Semi nole
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
Semi no!e
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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DOCTORS LAKE
<8> Tributary Sampling Site
X Lake Sampling Site
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DOCTORS LAKE
STORE! NO. 1207
I. CONCLUSIONS
A. Trophic Condition:
Survey data indicate that Doctors Lake is eutrophic. It
ranked seventeenth in overall trophic quality when the 41 Florida
lakes sampled in 1973 were compared using a combination of six
lake parameters*. Sixteen of the lakes had less median total
phosphorus, 16 had less and one had the same median dissolved
phosphorus, nine had less and one had the same median inorganic
nitrogen, 17 had less mean chlorophyll a_, and 16 had greater
mean Secchi disc transparency.
Survey limnologists noted extensive beds of floating and
emergent macrophytes near each of the three sampling stations
during one or more visits and observed a bloom of filamentous
algae along the shoreline near station 3 in November.
B. Rate-Limi ting Nutrient:
The algal assay results indicate Doctors Lake was nitrogen
limited at the time the sample was collected (03/07/73). The
lake data indicate nitrogen limitation each sampling time at
stations 1 and 3 and at the second and last sampling times at
station 2.
* See Appendix A.
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C. Nutrient Controllability:
1. Point sources—During the sampling year, Doctors Lake
received a total phosphorus loading nearly three times
that proposed by Vollenweider (Vollenweider and Dillon, 1974)
as a eutrophic loading (see page 13). Approximately 89% of this
load came from three Orange Park sewage treatment plants.
However, these plants were closed in March and April of 1975,
and the wastewater was diverted to larger plants which dis-
charge to St. Johns River downstream from Doctors Lake (Dutton,
1975). Based on the sampling year data, this reduced the total
phosphorus loading rate to 0.08 g/m2/yr which is less than
Vollenweider's proposed oligotrophic loading. It is likely
that the trophic condition of the lake will improve significantly
once a new phosphorus equilibrium is established, and phosphorus
more frequently becomes the limiting nutrient.
2. Non-point sources—Direct precipitation was the major
non-point source of phosphorus during the sampling year,
contributing about 6% of the total phosphorus load. Minor
tributaries and immediate drainage and Swimming Creek con-
tributed about 4% and 1% of the total phosphorus load respec-
tively.
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II. LAKE AND DRAINAGE BASIN CHARACTERISTICS1"
A. Lake Morphometry .
1. Surface area: 12.96 kilometers2.
2. Mean depth: 3.0 meters.
3. Maximum depth: 4.0 meters.
4. Volume: 38.880 x 106 m3.
5. Mean hydraulic retention time: 1.7 years.
B. Tributary and Outlet:
(See Appendix C for flow data)
1. Tributaries -
Drainage Mean flow
Name area (km2)* (m3/sec)*
Swimming Creek 7.8 0.13
Minor tributaries &
immediate drainage - 37.2 0.59
Totals 45.0 0.72
2. Outlet -
Doctors Inlet 58.0** 0.72
C. Precipitation***:
1. Year of sampling: 158.7 centimeters.
2. Mean annual: 135.5 centimeters.
t Table of metric equivalents - Appendix B.
tt Morphometry calculated from depth contours on U.S.G.S. Fleming Island,
Orange Park, Jacksonville Heights, and Middleburg quad maps.
* For limits of accuracy, see Working Paper No. 175, "...Survey Methods,
1973 - 1975".
** Includes area of lake.
*** See Working Paper No. 175.
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4
III. LAKE WATER QUALITY SUMMARY
Doctors Lake 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 one or more depths at each station (see map, page v).
During each visit, a single depth-integrated (4.6 m or 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 4.9 meters at station 1, 2.7 meters at station 2, and 1.5 meters
at station 3.
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
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B.
Biological characteristics:
1. Phytoplankton -
Sampling
Date
03/07/73
09/07/73
11/08/73
2. Chlorophyll .a -
Sampling
Date
03/02/73
09/07/73
11/08/73
Dominant
Genera
1. Melosira sp.
2. Microcystis sp.
3. Kirchneriella sp.
4. Merismopedia sp.
5. Scenedesmus sp.
Other genera
Total
1. Oscillatoria sp.
2. Dactylococcopsis sp.
Centric diatoms
Lyngbya sp.
Merismopedia sp.
Other genera
1.
2.
3.
4.
5.
Total
Oscillatoria sp.
Dactylococcopsis sp.
Flagellates
Scenedesmus sp.
Microcystis sp.
Other genera
Total
Number
per ml
Station
Number
1
2
3
1
2
3
1
2
3
4,132
15,708
11,396
5,544
5,236
1,694
13.860
53,438
11,678
11,293
3,337
2,695
2,566
11,291
42,860
Chlorophyll
(ug/D
6.6
43.5
31.6
28.0
39,
41.
3.1
26.6
24.0
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7
C. Limiting Nutrient Study:
1. Autoclaved, filtered, and nutrient spiked -
Ortho P Inorganic N Maximum Yield
Spike (mg/1) Cone, (mg/1) Cone, (mg/1) (mg/1-dry wt.)
Control 0.036 0.156 4.7
0.050 P 0.086 0.156 4.4
0.050 P + 1.0 N 0.086 1.156 20.0
1.0 N 0.036 1.156 9.8
2. Discussion -
The control yield of the assay alga, Selenastrum capri-
cornutum, indicates that the potential primary productivity
of Doctors Lake was moderately high at the time the assay
sample was collected (03/07/73). Also, the increased yield
when only nitrogen was added and the lack of response when
orthophosphorus alone was added indicate that the lake
was nitrogen limited when at that time.
With the exception of sampling station 2 during the
first visit (mean N/P ratio = 20/1), the lake data indicate
nitrogen limitation at all sampling times (i.e., the mean
inorganic nitrogen to orthophosphorus ratios were less than
9 to 1).
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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
determined by using a modification of a U.S. Geological Survey com-
puter program for 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
B-l and multiplying by the ZZ area in km2.
The operators of the Orange Park sewage treatment plants did not
participate; nutrient loads from these sources were estimated at 1.134
kg P and 3.401 kg N/capita/year, and flows were estimated at 0.3785
m3/capita/day.
* See Working Paper No. 175.
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A. Waste Sources:
1. Known municipal* -
Name
Pop.
Served
Orange Park -
Robinette 203
SD
Grove 5,554
Park SD
Lakeside 2,040
Estates SD
Treatment
Mean Flow
(m3/d)**
act. sludge 76.8
act. sludge 2,102.2
act. sludge 772.1
Receiving
Water
Doctors Lake
Spring Branch
Lucy Branch
2. Known industrial - None
* Avery, 1975; Dutton, 1975.
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10
B. Annual Total Phosphorus Loading - Average Year:
1. Inputs -
kg P/ % of
Source r total
a. Tributaries (non-point load) -
Swimming Creek 80 0.8
b. Minor tributaries & immediate
drainage (non-point load) - 380 3.9
c. Known municipal STP's
Orange Park -
Robinette SD 230 2.3
Grove Park SD 6,300 63.5
Lakeside Estates SD 2,315 23.3
d. Septic tanks* - 40 0.4
e. Known industrial - None
f. Direct precipitation** - 570 5.8
Total 9,915 100.0
2. Outputs -
Lake outlet - Doctors Inlet 2,295
3. Net annual P accumulation - 7,620 kg.
* Estimate based on 137 lakeshore dwellings; see Working Paper No. 175.
** Brezonic and Shannon, 1971.
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11
C. Annual Total Nitrogen Loading - Average Year:
1. Inputs -
kg N/ % of
Source yr total
a. Tributaries (non-point load) -
Swimming Creek 8,075 9.8
b. Minor tributaries & immediate
drainage (non-point load) - 38,510 46.9
c. Known municipal STP's -
Orange Park -
Robinette SD 690 0.8
Grove Park SD 18,890 23.0
Lakeside Estates SD 6,940 8.5
d. Septic tanks* - 1,460 1.8
e. Known industrial
f. Direct precipitation** - 7,520 9.2
Total 82,085 100.0
2. Outputs -
Lake outlet - Doctors Inlet 70,110
3. Net annual N accumulation - 11,975 kg.
* Estimate based on 137 lakeshore dwellings; see Working Paper No. 175.
** Brezonic and Shannon, 1971.
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12
D. Non-point Nutrient Export by Subdrainage Area:
Tributary kg P/km2/yr kg N/km2/yr
Swimming Creek 10 1,035
E. Yearly Loading Rates:
In the following table, the existing phosphorus loading
rates are compared to those proposed by Vollenweider (Vollen-
weider 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" rate is the rate at
which the receiving water would become eutrophic or remain
eutrophic; his "permissible" rate is that which would result
in the receiving water remaining oligotrophic if morphometry
permitted. A mesotrophic rate 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 0.77 0.59 6.3 0.9
Vollenweider loading rates for phosphorus
(g/m2/yr) based on mean depth and mean
hydraulic retention time of Doctors Lake:
"Dangerous" (eutrophic rate) 0.26
"Permissible" (oligotrophic rate) 0.13
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13
V. LITERATURE REVIEWED
Avery, Raymond, 1975. Personal communication (Orange Park waste-
water treatment plants). Kingsley Utility Serv., Orange Park.
Brezonik, Patrick L., and Earl R. Shannon, 1971. Trophic state
of lakes in north central Florida. Publ. No. 13, Water Res.
Research Ctr., U. of FL, Gainesville.
Dutton, G. Doug, 1975. Personal communication (Orange Park
wastewater treatment plants). FL Dept of Env. Reg., Lower St.
Johns River Subd., Jacksonville.
Shannon, Earl E., and Patrick L. Brezonik, 1972. Relationships
between lake trophic state and nitrogen and phosphorus loading
rates. Env. Sci. & Techn. ([ (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
14
APPENDIX A
LAKE RANKINGS
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LAKES RANKED BY INDEX
RANK LAKE CODE LAKE NAME INOEX NO
29 1231 LAKE MONROE 215
30 1217 LAKE HANCOCK 213
31 1252 LAKE ELOISE 207
32 1264 PAYNE'S PRAIRIE LAKE
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LAKES RANKED 8Y INDEX NOS.
RANK LAKE CODE LAKE NAME INDEX NO
1 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 OKEECHOBEE 368
14 1228 LAKE MARION 366
15 1206 LAKE CRESCtNT 346
16 1234 LAKE POINSETT 342
17 1207 DOCTORS LAKE 341
18 1236 LAKE REEDT 337
19 1211 LAKE GIBSON 324
20 1208 LAKE DORA 297
21 12J9 LAKE TALOUIN 294
22 1202 LAKE APOPKA 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. TOHOPEKALIGA 229
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PERCENT OF LAKES XITH HIGHER VALUES (NUMBED or LAKES WITH HIGHEW VALUES)
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
126<» PAYNE'S PRAIRIE LAKE (NO
MEDIAN
TOTAL P
20 (
33 (
15 (
75 (
9P (
6 (
35 (
0 (
83 (
30 (
73 (
80 (
11 <
8)
13)
6)
30)
39)
3)
14)
0)
33)
12)
29)
32)
4)
MEDIAN
INOSG N
85
40
8
91
58
5
48
0
98
50
88
98
65
( 34)
( 16)
( 3)
( 36)
< 23)
< 2)
( 19)
( 0)
( 38)
( 20)
( 35>
( 38)
( 26)
500-
MEAN SEC
58
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
CHLOKA
40
48
23
68
63
8
10
20
90
28
60
98
15
( 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)
3b)
MEDIAN
oiss OKTHO 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
26b
229
110
495
467
58
260
98
*91
207
419
523
206
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PERCENT OF LAKES
LAKE
CODE LAKE NAME
1201 ALLIGATOR LAKE
1202 LAKE APOPKA
1203 LAKE BANANA
1206 LAKE CRESCENT
1207 DOCTORS LAKE
1208 LAKE OOWA
1209 LAKE EFFIE
1213 LAKE GEORGE
1211 LAKE GIBSON
1212 GLENADA LAKE
1214 LAKE GPIFFIN
1215 LAKE HAINES
1217 LAKE HANCOCK
1219 LAKE HORSESHOE
1220 LAKE HOWELL
1221 LAKE ISTOKPOGA
122.3 LAKE JESSUP
1224 LAKE KISSIMMEE
1227 LAKE LULU
1228 LAKE MARION
1229 LAKL MINNE^AHA
1230 LAKE MINNEOLA
1231 LAKE MONROE
1232 LAKE OKEECH06EE
123* LAKE POINSETT
1236 LAKE KEEDY
1238 LAKE SOUTH
1239 LAKE TALOUIN
HIGHER VALUES (NUMBER OF LAKES WITH HIGHER VALUES)
MEDIAN
TOTAL P
25
50
23
65
60
53
5
45
40
43
4P
70
18
93
11
85
28
90
3
78
88
100
38
68
58
95
63
55
( 10)
( 20)
( 9)
( 26)
( ?4)
( 21)
( 2)
( 18)
( 16)
( 17)
( 19)
( 28)
( 7)
( 37)
( 4)
( 34)
< 11)
< 36)
( 1>
< 31)
( 35)
( 40)
( 15)
( 27)
( ?3>
< 3S)
( 25)
( 22)
MEDIAN
INOPG N
29 <
38 <
29 (
70 (
76 <
35 (
10 (
54 (
81 (
54 (
29 <
81 (
43 (
70 <
23 (
76 (
IK (
63 (
3 <
29 (
91 (
98 (
15 (
45 <
60 <
13 (
70 <
20 (
10)
15)
10)
27)
30)
14)
4)
21)
32)
21)
10)
32)
17)
27)
9)
30)
7)
25)
1)
10)
36)
38)
6)
18)
24)
5)
27)
8)
500-
MEAN SEC
30
10
20
33
60
18
3
48
45
85
23
75
13
80
69
65
5
7 3.
15
53
95
98
2tt
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
38
5
80
55
33
3
43
7C
53
30
58
13
78
35
93
2b
05
0
bO
85
100
<<*
73
95
4b
68
83
( 7)
< 15)
( 2)
< 32)
( 22)
( 13)
( 1)
( 17)
( 28)
( 21)
( 12)
( 23)
( 5)
( 3D
( 14)
( 37)
( 10)
( 26)
( 0)
( 20)
{ 34)
( 40)
( 30)
( 29)
( 38)
( 18)
( 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)
( 0)
( 9)
( 18)
( 1)
( 38)
( 12)
( 39)
( 8)
( 23)
( 27)
( 32)
( 26)
( 3)
( 32»
( 31)
( 35)
( 10)
( 21)
( 12)
( 12)
( 23)
( 2)
MEDIAN
OISS ORTHO P
18 <
70 (
23 1
50 1
56 1
68 1
10 1
43 1
40 1
38 1
48 1
78 1
28 1
65 1
3 1
89 i
25 i
99 i
5 i
73 (
80 i
93 '
33 i
89 i
45 >
95
56
53
7)
; 28)
; 9)
: 20)
: 22)
; 27»
: 4)
I 17)
[ 16)
; is)
; 19)
: 3D
: ID
[ 26)
I 1)
1 35)
! 10)
I 39)
! 2)
( 29)
1 32)
( 37)
t 13)
( 35)
I 18)
( 38)
t 22) ,
( 21)
INDEX
NO
130
280
200
346
341
297
31
256
324
276
273
396
213
«06
201
477
184
4=5
34
366
517
579
215
368
3*2.
33/
3
-------
LAKE DATA TO BE USED IN RANKINGS
LA*E
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 LArfNE
1250 LAKE TARPON
1252 LAKE ELOISE
1258 LAKE JESSIE
1261 EAST LAKE TOHOPEKALIGA
1264 PAYNE'S PWAIRIE LAKE (NO
MEDIAN
TOTAL P
0.0*5
0.246
1.110
0.047
0.027
1.475
0.234
?.56C
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
CHLO«A
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-
MIN DO
10.200
10.500
12.900
8.200
7.600
12.200
8.600
10.«00
9.000
12.200
10.800
9.400
7.400
MEDIAN
DISS ORTHO P
0.565
0.152
0.^70
0.011
0.014
0.852
0.026
0.117
O.U27
0.339
0.011
0.007
1.210
-------
LAKE OATA TO BE USED IN RANKINGS
LAKE
CUOE 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 LArtNE
1250 LAKE TARPON
12S2 LAKE ELOISE
1258 LAKE JESSIE
1261 EAST LAKE TOMOPEKALIGA
1264 PAYNE'S PKAIRIE LAKE (NO
MEDIAN
TOTAL P
0.6V5
0.246
1.110
0.047
0.027
1.475
0.234
?.56C
0.041
0.486
0.051
0.042
1.260
MtOIAN
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
CHLOWA
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-
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 OKTriO 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
-------
APPENDIX C
TRIBUTARY FLOW DATA
-------
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 = 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
-------
STORE! RETRIEVAL DATE 76/03/10
1207B1
30 05 00.0 OBI 43 30.0
SHIMMING PEN CREEK
12 7.5 FLEMING ISLA
1/OOCTORS LAKE
RO JUST NM OF FLEMING ISLAMD AIRFIELD
11EPALES 2111204
4 0000 FEET DEPTH
DATE
FROM
TO
73/03/17
73/05/20
73/06/14
73/07/16
73/08/18
73/09/15
74/02/17
TIME DEPTH
OF
DAY FEET
10 30
22 30
13 30
11 40
10 07
10 30
15 30
00630
N02&N03
N-TOTAL
MG/L
0.025
0.025
0.033
0.011
0.014
0.012
0.044
00625
TOT KJEL
N
MG/L
3.600
2.300
3.780
0.720
1.600
1.540
0.300
00610
NH3-N
TOTAL
MG/L
0.120
0.096
0.078
0.029
0.084
0.072
0.010
00671
PHOS-DIS
ORTHO
MG/L P
0.017
0.005K
0.013
0.009
0.011
0.010
00665
PHOS-TOT
MG/L P
0.025
0.030
0.030
0.015
0.015
0.011
0.015
-------
STORE! RETRIEVAL DATE 76/02/10
1207A1
30 09 00.0 081 42 00.0
DOCTORS INLET
12 7.5 ORANGE PARK
0/DOCtORS LAKE
US HWY 17 BRDG
11EPALES 2111204
4 0000 FEET DEPTH
DATE
FROM
TO
73/03/17
73/04/13
73/05/20
73/06/14
73/07/16
73/08/18
73/09/15
73/10/14
73/11/16
73/12/14
74/01/19
74/02/17
00630 00625
TIME DEPTH N02&N03 TOT KJEL
OF N-TOTAL N
DAY FEET
10
14
22
13
12
10
11
08
16
11
10
16
00
35
20
50
08
37
10
03
30
30
30
00
MG/L
0
0
0
0
0
0
0
0
0
0
0
0
.168
.120
.023
.042
.110
.010*
.063
.069
.084
.168
.300
.460
MG/L
9.
5.
3.
5.
0.
1.
1.
0.
0.
0.
1.
0.
450
200
100
300
880
380
540
900
850
800
100
800
00610 00671 00665
NH3-N PHOS-DIS PHOS-TOT
TOTAL ORTHO
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
260
120
132
231
025
071
040
031
024
020
032
030
MG/L P
0
0
0
0
0
0
0
0
0
0
0
0
.042
.040
.035
.056
.063
.066
.068
.046
.060
.076
.072
.060
MG/L P
0.155
0.085
0.110
0.105
0.095
0.100
0.095
0.085
0.100
0.115
0.105
0.110
-------
APPENDIX E
TRIBUTARY DATA
-------
STORET RETRIEVAL DATE 76/02/10
DATE
FROM
TO
73/03/07
73/09/07
73/11/08
TIME DEPTH
OF
DAY FEET
15 50 0000
15 50 0004
12 30 0000
10 00 0000
10 00 0005
00665
PHOS-TOT
MG/L P
0.064
0.069
0.083
0.075
0.082
32217
CHLRPHYL
A
UG/L
31.6
41.3
24.0
120703
30 06 16.0 081 44 59.0
DOCTORS LAKE
12 FLORIDA
11EPALES
3
2111202
0007 FEET
DEPTH
-------
STORET RETRIEVAL DATE 76/02/10
120703
30 06 16.0 081 44 59*0
DOCTORS LAKE
12 FLORIDA
DATE
FROM
TO
73/03/07
73/09/07
73/11/08
TIME DEPTH
OF
DAY FEET
15 50 0000
15 50 0004
12 30 0000
10 00 0000
10 00 0005
00010
WATER
TEMP
CENT
23.2
21.2
29.3
20.7
20.1
00300 00077 00094
DO TRANSP CNDUCTVY
SECCH1 FIELD
MG/L INCHES MICrtOMHO
8.8
5.0
7.4
31
35
26
1300
1600
716
717
704
11EPALES
3
00400
PH
SU
8.80
8.50
7.90
7.90
7.40
00410
T ALK
CAC03
MG/L
40
38
25
57
57
2111202
0007
00610
NH3-N
TOTAL
MG/L
0.050
0.050
0.050
0.040
0.040
FEET DEPTH
00625
TOT KJEL
N
MG/L
1.600
1.400
2.000
1.300
1.200
00630
N02&N03
N-TOTAL
MG/L
0.050
0.040
0.030
0.010
0.020
00671
PHOS-OIS
ORTHO
MG/L P
0.012
0.011
0.022
0.019
0.028
-------
STORE! RETRIEVAL DATE 76/02/10
00665 32217
DATE TIME DEPTH PHOS-TOT CHLRPHYL
FROM OF A
TO DAY FEET MG/L P UG/L
73/03/07 15 10 0000 0.066 43.5
15 10 0004 0.062
15 10 0008 0.065
73/09/07 12 40 0000 0.084 39.2
73/11/08 10 30 0000 0.077 26.6
10 30 0007 0.085
120702
30 07 53.0 081 43 59.0
DOCTORS LAKE
12 FLORIDA
11EPALES
3
2111202
0012 FEET
DEPTH
-------
STORET RETRIEVAL DATE 76/02/10
130702
30 07 53.0 081 43 59.0
DOCTORS LAKE
12 FLORIDA
DATE
FROM
TO
73/03/07
73/09/07
73/11/08
TIME DEPTH
OF
DAY FEET
15 10 0000
15 10 0004
15 10 0008
12 40 0000
12 40 0009
10 30 0000
10 30 0007
00010
WATER
TEMP
CENT
19.5
19.4
17.8
30.1
29.2
21.1
20.6
00300 00077 00094
DO TRANSP CNDUCTVY
SECCHI FIELD
MG/L INCHES MICROMHO
9.2
5.1
7.0
7.2
30
34
30
1700
1650
1800
790
806
740
746
11EPALES
3
00400
PH
SU
8.20
8.20
8.10
8.70
7.30
7.30
00410
T ALK
CAC03
MG/L
42
41
44
48
58
59
2111202
0012 FEET DEPTH
00610
NH3-N
TOTAL
MG/L
0.140
0.060
0.260
0.050
0.030
0.040
00625
TOT KJEL
N
MG/L
1.500
1.200
1.500
2.000
1.200
1.400
00630
N02&N03
N-TOTAL
MG/L
0.060
0.080
0.090
0.030
0.010
0.020
00671
PHOS-DIS
ORTHO
MG/L P
0.011
0.012
0.011
0.021
0.016
0.028
-------
STORET RETRIEVAL DATE 76/02/10
DATE
FROM
TO
73/03/07
73/09/07
73/11/08
TIME DEPTH
OF
DAY FEET
14 15 0000
14 15 0004
14 15 0008
12 55 0000
12 55 0008
12 20 0000
12 20 0005
12 20 0010
12 20 0016
00665
PHOS-TOT
MG/L P
0.091
0.089
0.090
0.088
0.097
0.117
0.110
0.105
0.099
32217
CHLRPHYL
A
UG/L
6.6
28.0
3.1
120701
30 09 00.0 061 42
DOCTORS LAKE
12 FLORIDA
15.0
11EPALES
3
2111202
0010 FEET
DEPTH
-------
STORET RETRIEVAL DATE 76/02/10
120701
30 09 00.0 081 42 15.0
DOCTORS LAKE
12 FLORIDA
DATE
FROM
TO
73/03/07
73/09/07
73/11/08
TIME DEPTH
OF
DAY FEET
14 15 0000
14 15 0004
14 15 0008
12 55 0000
12 55 0008
12 20 0000
12 20 0005
12 20 0010
12 20 0016
00010
MATER
TEMP
CENT
18.5
18.4
18.3
30.2
28.9
21.7
21.9
21.6
21.6
00300 00077 00094
00 TRANSP CNDUCTVY
SECCHI FIELD
MG/L INCHES MICROMHO
8.0
8.0
5.8
4.4
6.2
7.0
6.6
30
34
60
810
815
825
791
770
7233
7231
7230
7232
11EPALES
3
00400
PH
SU
7.60
7.70
8.20
8.70
8.20
7.00
7.20
7.20
7.40
00410
T ALK
CAC03
MG/L
43
42
43
47
48
66
64
64
63
2111202
0010
00610
NH3-N
TOTAL
MG/L
0.090
0.050
0.050
0.050
0.040
0.080
0.060
0.060
0.070
FEET DEPTH
00625
TOT KJEL
N
MG/L
1.800
1.200
1.200
.800
.400
.600
.100
.200
1.100
00630
N02&N03
N-TOTAL
MG/L
0.280
0.250
0.250
0.030
0.030
0.240
0.230
0.230
0.230
00671
PHOS-DIS
ORTriO
MG/L P
0.04U
0.046
0.047
0.038
0.038
0.098
0.090
0.086
0.079
-------
APPENDIX D
PHYSICAL and CHEMICAL DATA
-------
TRIBUTARY FLOW INFORMATION FOR FLORIDA
LAKE CODE 1207 DOCTORS LAKE
TOTAL DRAINAGE AREA OF LAKE(SO KM) 58.0
02/10/76
SUB-DRAINAGE
TRIBUTARY AREA(SO KM)
1207AI
1207B1
1207ZZ
58.0
7.8
36.3
JAN
0.57
0.10
0.45
FE8
0.88
0.16
0.74
MAR
0.85
0.15
0.71
APR
0.48
0.08
0.40
TOTAL DRAINAGE AREA OF LAKE
SUM OF SUB-DRAINAGE AREAS
MEAN MONTHLY FLOWS AND DAILY FLOWS(CMS)
TRIBUTARY MONTH YEAR
1207A1
1207B1
1207ZZ
MEAN FLOW DAY
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
2.04
3.03
0.03
0.93
0.40
1.42
1.08
0.31
-0.31
0.99
0.0
0.06
0.22
0.40
0.04
0.21
0.09
0.22
0.12
0.05
0.02
0.10
0.04
0.05
1.02
1.87
0.19
0.96
0.42
1.02
0.57
0.24
0.09
0.48
0.20
0.24
17
13
20
14
16
18
15
14
16
14
19
17
17
13
20
14
16
18
15
14
16
14
19
17
17
13
20
14
16
18
15
14
16
14
19
17
MAY
0.37
0.07
0.31
NORMALIZED FLOWS(CMS)
JUN JUL AUG
0.48
0.08
0.40
0.79
0.14
0.65
1.13
0.20
0.93
SEP
1.22
0.22
0.99
OCT
0.99
0.18
0.82
NOV
0.37
0.07
0.31
DEC
0.51
0.09
0.42
MEAN
0.72
0.13
0.59
SUMMARY
58.0
44.0
TOTAL FLOW IN
TOTAL FLOW OUT
8.66
8.64
FLOW DAY
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.10
0.12
0.02
0.02
0.05
0.10
0.20
0.05
0.02
0.04
0.03
0.03
0.48
0.59
0.10
0.11
0.24
0.45
0.91
0.24
0.07
0.20
0.13
0.08
FLOW DAY
FLOW
------- |