U.S. ENVIRONMENTAL PROTECTION AGENCY
               NATIONAL EUTROPHICATION SURVEY
                        WORKING PAPER SERIES
                                              REPORT
                                               ON
                                            LAKE DORA
                                            LAKEOMIY
                                             FLORim
                                           EPA REGION IV
                                        WORKING PAPER No, 248
     CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
                                 and
    ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
•&G.P.O. 699-440

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                                      REPORT
                                        ON
                                    LAKE DORA
                                   LAKE COUNTY
                                     FLORIEA
                                  EPA REGION IV
                              WORKING PAPER No,  248
          WITH THE COOPERATION OF THE
FLORIDA DEPARTMENT OF ENVIRONMENTAL REGULATION
                   AND THE
            FLORIDA NATIONAL GUARD
                OCTOBER, 1977

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                                   CONTENTS
  Foreword                                                ii
  List of Florida Study 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 Pxcviewed                                14
 VI.   Appendices                                         15

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                          F  0  \\  E  V  0  R  D
    The  Matlonol  CutrGpiii cation Survey was  initiated in 1972 in
response to an Administration  commitment  to  investigate the nation--
wide  threat of accelerated  eutrophication to fresh water lakes arid
reservoirs.

OWIDCTIVRS.

    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 eutrophicaticn 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 general i>:c-d 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)j,
and v/ater 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 loke 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 waler lakes.  Likewise, milltivariate 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 Eutrcph'Ication 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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                                    1v
                      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
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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                                                                                     Map Location
                                                    Oakland
                                                        Park
  LAKE  DORA
<8>Tributary Sampling Site
X Lake Sampling Site
 F Sewage Treatment Facility
   0        1        2  Km.
                      Mi.

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                               LAKE DORA
                            STORE! NO. 1208
    CONCLUSIONS
    A.  Trophic Condition:
            Survey data and a report by others (Shannon and Brezonik, 1972)
        indicate that Lake Dora is hypereutrophic.  Based on a comparison
        of six water quality parameters, this lake ranked twentieth in over-
        all trophic quality among the 41 Florida lakes sampled in 1973*.
        Nineteen of the lakes had less and one had the same median total
        phosphorus, 13 had less median dissolved phosphorus, 25 had less
        median inorganic nitrogen, 18 had less mean chlorophyll a^, and 33
        had greater mean Secchi disc transparency.  Depression of dissolved
        oxygen was not evident at any of the Survey sampling times; however,
        it is reported that Lake Dora has had summer fish kills (Ketelle
        and Uttormark, 1971).
            High numbers of blue-green algae (page 7), chlorophyll ^con-
        centrations of up to 100 yg/1, and Secchi disc transparencies of
        0.5 meter or less indicate the enriched condition of the lake.
    B.  Rate-Limiting Nutrient:
            There was a significant loss of inorganic nitrogen in
        the sample, and the algal  assay results are not representative
        of conditions in the lake at the time the sample was collected
        (03/12/73).
            The lake data indicate phosphorus limitation in March and
        nitrogen limitation in September and November.
* See Appendix A.

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                                     2
                                         *
    C.  Nutrient Controllability:
            1.  Point sources—During the sampling year, Lake Dora
        received an estimated total phosphorus loading of 1.83 g/m2,
        or more than four times that proposed by Vollenweider (Vollenweider
        and Dillon, 1974) as a eutrophic loading.   However,  over 87%  of
        the estimated load is attributed to the Apopka-Beauclair Canal,
        but because of expected but unquantified phosphorus  retention in
        intervening Lake Beauclair (see map, page v), the phosphorus
        contribution of the Canal must have been less than indicated.
        Therefore, the overall Lake Dora phosphorus loading  also must
        have been less than shown above (e. g., if 40% phosphorus entrap-
        ment had occurred in Lake Beauclair, the Lake Dora loading would
        have been 1.19 g/m2/yr or 2.7 times the eutrophic level).
            It is estimated that 5.5% of the total phosphorus load was
        contributed by the Mount Dora wastewater treatment plant during
        the sampling year.  Phosphorus removal or effluent diversion  at
        this source probably would not result in an appreciable improve-
        ment in the trophic condition of the lake unless phosphorus can be
        controlled elsewhere in the drainage.
            The municipal, industrial, and agricultural sources in the
        upstream Lake Apopka* drainage contributed an estimated 60,990 kg
        of phosphorus to that lake during the sampling year.  Allowing for
        retention in Lake Apopka (54.4%), it is calculated the above  sources
Working Paper No. 244.

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                                     3
        contributed 67.8% of the 35,925 kg phosphorus  load measured at
        the Apopka-Beauclair Canal  outlet station (1202 A-l);  i.e., 27,810
        kg.  Because of the uncertainty as to the degree of phosphorus
        retention in Lake Beauclair noted above,  the impact of the indirect
        phosphorus sources cannot be quantified;  however, again assuming
        40% retention in Lake Beauclair, those sources could have contributed
        nearly 17,000 kg of phosphorus to Lake Dora and thus could have been
        significant sources.
            Although a critical  assessment of the effects of phosphorus
        control on the trophic condition of Lake Dora  is dependent on a
        determination of phosphorus retention in Lake  Beauclair, it seems
        likely that a high degree of phosphorus removal at all  of the
        sources in the drainage would result in an appreciable improvement,
        particularly since Florida  lakes may be able to assimilate phos-
        phorus at a higher level than that suggested by Vollenweider (see
        page 13).
            2.  Non-point sources—With municipal, industrial,  and agri-
        cultural  nutrient loads subtracted, the phosphorus and nitrogen
        exports of the Apopka-Beauclair Canal were 17  and 465 kg/km2,
        respectively, during the sampling year (page 13).  These rates are
        comparable to the means of the rates of two tributaries of nearby
        Lake Griffin* (16 kg P and  412 kg N/km2/yr).
** Working Paper No.  254.

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                                       5
III.   LAKE WATER QUALITY SUMMARY
      Lake Dora was sampled three times during 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 (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  1.8
  meters at station 1, 2.4 meters at station 2, and 2.7 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 (o
DISS OXY (MG/L)
CNUCTVY (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)
INORG N (MG/L)
TOTAL N (MG/L)
CHLRPYL A 
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B.   Biological characteristics:

    1.   Phytoplankton -
        Sampling
        Date

        03/12/73
        09/06/73
        11/05/73
        Sampli ng
        Date

        03/12/73
        09/06/73
        11/05/73
Dominant
Genera

1.  Lyngbya S£.
2.  Microcystis sp.
3.  Aphanocapsa sp.
4.  Merismopedia sp.
5.  Scenedesmus sp.
    Other genera

            Total

1.  Lyngbya sp.
2.  Aphanocapsa sja.
3.  Microcystis sp.
4.  Chroococcus sp.
5.  Melosira sp.
    Other genera

            Total

1.  Lyngbya sp.
2.  Microcystis sp.
3.  Chroococcus sp.
4.  Merismopedia sp.
5.  Anabaena sp.
    Other genera
                                          Total
Station
Number

   1
   2
   3

   1
   2
   3

   1
   2
   3
 Algal Units
 per ml	

 17,816
  3,857
  3,061
  2,939
    979
  8,939

 37,591

 42,201
  3,389
  3,081
  2,464
  2,310
  7,700

 61,145

 64,102
 13,090
  6,352
  5,005
  1,732
 10.391
100,672

 Chlorophyll
 (yg/1)

    36.7
    44.8
    66.5

    69.0
    71.8
    99.8

    31.3
    63.9
    56.0

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                                 8
C.  Limiting Nutrient Study:
        There was a 60% loss of inorganic nitrogen in the sample
    between the time of collection and the beginning of the algal
    assay, and the results are not representative of conditions in
    the lake at the time the sample was taken (03/12/73).
        The lake data indicate phosphorus limitation in March at
    all stations but nitrogen limitation at all  stations in September
    and November.
        Following is a tabulation of the mean inorganic nitrogen/
    orthophosphorus ratios for each of the stations and sampling
    times with the indicated limiting nutrient in parentheses.
    Station          03/12/73          09/06/73          11/05/73
        1            22/1 (P)          11/1 (N)            6/1 (N)
        2            21/1 (P)           8/1 (N)            5/1 (N)
        3            20/1 (P)           7/1 (N)            5/1 (N)

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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.
     In  this report, nutrient loads for sampled tributaries were
 determined by using a modification of a U.S.  Geological Survey  computer
 program for calculating stream loadings*.   Nutrient  loads  shown are
 those measured minus point-source loads,  if any.
     The flows given for site 1202A-1  (Lake Apopka  outlet)  were  added to
 the Lake Dora B-l  and II flows to determine the  total  inflow to the lake
 (Anderson, 1974).   Also, nutrient loads at the Lake  Apopka outlet
 station are reported as inlet  loads  to Lake Dora.
     Nutrient loads for station B-l and the unsampled "minor  tributaries
 and immediate drainage" ("ZZ"  of U.S.G.S.) were  estimated  using the
 means of the nutrient loads,  in kg/km2/yr, at stations A-l and  B-l  of
 nearby  Lake Griffin** and multiplying  the means  by the ZZ  area  in km2.
 * See  Working  Paper No.  175.
 ** Working  Paper No.  254.

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                                     10
    The operator of the Mount Dora wastewater treatment plant provided
only two effluent samples; therefore, nutrient loads were estimated
at 1.134 kg P and 3.401 kg N/capita/year, and the mean flow was esti-
mated at 0.3785 m3/capita/day.
    A.   Waste Sources:
        1.  Known municipal -
                        Pop.                  Mean Flow      Receiving
        Name            Served    Treatment   (m3/d)         Water
        Mount Dora      2,000*    trickling       757.0      Unnamed Creek B-l
                                   filter
        2.  Known industrial - None
* Treatment plant questionnaire.

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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                  20         <0.1
                Apopka-Beauclair Canal         35,925         87.6
            b.  Minor tributaries & immediate
                 drainage (non-point load) -    1,760          4.3
            c.  Known municipal STP's -
                Mount Dora                      2,270          5.5
            d.  Indirect municipal -              ?
            e.  Septic tanks* -                    55          0.1
            f.  Indirect industrial &
                 agricultural                     ?
            g.  Direct precipitation** -          985          2.4
                           Total               41,015        100.0
        2.  Outputs -
            Lake outlet - Dora Canal           12,450
        3.  Net annual P accumulation - 28,565 kg.
* Estimate based on 202 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                 445         0.1
                Apopka-Beauclair Canal        354,670        83.7
            b.  Minor tributaries & immediate
                 drainage (non-point load) -   46,845        11.0
            c.  Known municipal STP's -
                Mount Dora                      6,800         1.6
            d.  Indirect municipal -              ?            -
            e.  Septic tanks* -                 2,155         0.5
            f.  Indirect industrial &
                 agricultural                     ?
            g.  Direct precipitation** -      . 12,975         3.1
                           Total              423,890       100.0
        2.  Outputs -
            Lake outlet - Dora Canal          312,365
        3.  Net annual N accumulation - 111,525 kg.
* Estimate based on 202 lakeshore dwellings; see Working Paper No. 175.
** Brezonik and Shannon, 1971.

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                                     13
    D.  Non-point Nutrient Export by Subdrainage Area:
        Tributary                             kg P/km2/yr    kg N/km2/yr
        Apopka-Beauclair Canal*                   17            465
    E.  Yearly Loading Rates:
            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/mVyr               1.83       1.28            18.9       5.0

        Vollenweider phosphorus loadings
         (g/m2/yr) based on mean depth and mean
         hydraulic retention time of Lake Dora:
            "Dangerous"  (eutrophic loading)             0.44
            "Permissible"  (oligotrophic loading)        0.22
* Municipal, industrial, and agricultural  loads subtracted.

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                                     14

V.   LITERATURE REVIEWED

    Anderson, Warren, 1974.  Personal communication (flow data).  U.S.
        Geol. Surv., 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.

    Ketelle, Martha J., and Paul D. Uttormark, 1971.  Problem lakes
        in the United States.  EPA Water Poll. Contr. Res. Ser.,
        Proj. #16010 EHR, Wash., DC.

    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 BE USED IN RANKINGS
LAKE
CODE  LAKE NAME
1201  ALLIGATOR LAKE
1202  LAKE APOPKA
1203  LAKE BANANA
1206  LAKE CRESCENT
1207  DOCTORS LAKE
1208  LAKE DORA
1209  LAKE EFF1E
1210  LAKE GEORGE
1211  LAKE GIBSON
1212  GLENAOA LAKE
1214  LAKE GRIFFIN
1215  LAKE HAINES
1217  LAKE HANCOCK
1219  LAKH. HORSESHOE
1220  LAKE HOWELL
1221  LAI'S iMOKPUdA
1223  LAKE JESSUP
1224  LAKE KISSIHMEE
1227  LAKE LULU
1226  LAKE MARION
1229  LAKE MINNEHAHA
1230  LAKE MINNEOLA
1231  LAKE MONROE
1232  LAKE OKEECHObEE
123*  LAKE POINSETT
1236  LAKE REEDY
1238  LAKE SOUTH
1239  LAKE TALQUIN
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
0.442
0.034
1.490
0.044
0.038
0.018
0.188
0.063
0.08?
0.033
0.074
0.085
MEDIAN
INORG N
0.260
0.230
0.260
0.130
0.120
0.240
0.410
0.16S
0.115
0.165
0.260
0.115
0.195
0.130
0.285
0.120
0.290
0.145
1.065
0.260
0.380
0.070
0.300
0.1HS
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
4S4.000
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
12.06?
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
23.100
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
7.4QO
10.800
9.600
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
0.2B8
0.007
1.030
0.016
0.012
C.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
!2<»i  LAKE TQHOPEKALIGA
12*2  TROUT LAKE
1243  LAKE NEOHTAKAPKA
1206  LAKE YALE
12<»7  LAKE MUNSON
12*8  LAKE SEMINOLE
1249  LAKE LAWNE
1250  LAKE TARPON
1252  LAKE ELOISE
1250  LAKE JESSIE
1261  EAST LAKE TOHOPEKALICA
1264  PAYNE'S PHAIRIE 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
INOR6 K
0.095
0.200
0.650
0.080
0.160
0.925
0.17S
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
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 30
10.200
10.500
12.90:
8.200
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
O.U27
0.339
0.011
0.007
1.210

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PERCENT OF LAKES MITH HIGHER VALUES (NUMBER OF LAKES MITH HIGHER VALUES)
LAKE
CODE  LAKE NAME
1201  ALLIGATOR LAKE
1202  LAKE APOPKA
1203  LAKE BANANA
1206  LAKE CRESCENT
1207  DOCTORS LAKE
1203  LAKE DORA
1209  LAKE EFF1E
1210  LAKE GEORGE
1211  LAKE GIBSON
1212  GLENADA LAKE
121*  LAKE GRIFFIN
1215  LAKE HAINES
1217  LAKE HANCOCK
1219  LAKt HORSESHOE
1220  LAKE HOtfELL
1P31  LAKE ISTOKPOGA
l?23  LAKE J6SSUP
1224  LAKE KISSIMMEE
1227  LAKE LULU
1228  LAKE MARION
1224  LAKt MINNEHAHA
1230  LAKE MINNEOLA
1231  LAKE MONROE
1232  LAKE OKEECHOaEE
123*  LAKE POINSETT
1236  LAKE NEEDY
123d  LAKE SOUTH
1239  LAKE TALOUIN
MEDIAN
TOTAL P
25 <
50 (
?3 <
65 (
60 (
53 C
5 (
45 <
40 (
43 (
46 (
70 (
16 (
93 I
11 (
M (
26 (
90 (
3 1
76 (
88 (
100 (
36 (
68 (
58 (
95 1
63 (
55 (
10)
20)
9)
26)
24)
21)
2)
18)
16)
17)
19)
26)
7)
37)
4)
J*»
HI
36)
1)
3D
35)
40)
15)
27)
23)
38)
25)
22)
MEDIAN
INORG N
29 (
30 (
29 (
70 (
76 (
35 (
10 <
54 (
81 (
54 (
29 (
81 (
43 C
70 (
23 (
76 C
16 (,
63 1
3 (
29 <
91 <
96 (
15 <
45 (
60 (
13 (
70 <
20 <
10)
IS)
10)
27)
301
14)
4)
21)
32)
21)
10)
32)
17)
27)
9)
30)
/7>
25)
D
10)
36)
38)
6)
18)
24)
5)
27)
8)
500-
MEAN SEC
30 (
10 <
20 (
33 (
60 (
18 <
3 (
48 I
45 (
85 1
23 (
75 (
13 1
80 (
69 (
6» <
5 (
73 1
IS (
53 (
95 (
98 <
2B <
40 (
50 (
55 t
69 (
78 (
12)
4)
8)
13)
24)
7)
D
19)
18)
34)
9)
30)
5)
32)
27)
26)
21
29)
6)
21)
38)
J9)
ID
16)
20)
22)
27)
3D
MEAN
CHLORA
18
38
5
60
55
33
3
43
70
S3
30
58
13
70
35
93
25
65
0
50
85
100
75
73
95
45
68
«3
1 7)
« 15)
( 2)
( 32)
< 22)
t 13)
( D
« 17)
( 28)
< 21)
I 12)
( 23)
1 5)
( 3D
( 14)
1 37)
( 101
( 26)
I 0)
1 20)
1 34)
1 40)
< 30)
( ?9)
( 38)
( 18)
( 27)
« 33)
15-
MIN 00
10 (
74 (
100 (
48 (
34 1
90 (
0 (
23 (
48 (
3 (
95 (
34 (
98 <
20 (
60 1
69 <
83 (
65 (
8 (
83 1
78 (
90 1
26 (
S3 (
34 (
34 (
60 1
5 I
4)
29)
40)
18)
12)
35)
0)
9)
18)
1)
38)
12)
39)
8)
23)
27)
32)
26)
3)
32)
3D
35)
10)
21)
12)
12)
23)
2)
MEDIAN
OISS ORTHO P
18
70
23
50
56
68
10
43
40
38
48
78
28
65
3
69
25
99
5
73
80
93
33
89
45
95
56
• i
INUE/1
NO
1JO
2BO
200
346
341
2*7
31
256
324
276
273
396
213
006
201
477
16,
435
34
366
517
579
215
368
342
33 /
386
,.. ,

-------
PERCENT or LAKES WITH HIGHER VALUES (NUMBER OF LAKES MITH HIGHER VALUES)
LAKE
CODE  LAKE NAME
1240  LAKE THONOTOSASSA
1241  LAKE TOHOPEKALIGA
1242  TROUT LAKE  '
1243  LAKE WEOHYAKAPKA
1246  LAKE VALE
12*.7  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
98
a
35
0
83
30
73
BO
11
( 8)
4 13)
< 6)
< 30)
( 39)
( 3)
( 14)
( 0)
( 33)
( 12)
( 29)
( 32)
( 4)
MEDIAN
INORG 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
86
93
25
( 23)
( 15)
( 17)
( 33)
( 36)
( 3)
( 14)
( 0)
( 40)
( 25)
( 35)
( 37)
( 10)
MEAN
CHLORA
40
48
23
88
63
8
10
20
90
28
60
98
15
( 16)
( 19)
( 9)
( 35)
( 25)
( 3)
( 4)
( 8)
( 36)
C 11)
( 24)
( 39)
( 61
15-
MIN DO
48
40
13
74
83
16
69
43
60
16
26
55
90
< let
( 16)
< S>
( 29)
( 32)
( 6)
( 27)
( 17)
( 23)
( 6)
( 10)
( 22)
( 35)
MEDIAN
OISS OUT HO P
15
30
a
84
75
13
63
35
60
20
84
99
0
( 6)
( 121
( 3)
1 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  1230       LAKE MINNEOLA              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 KISSIMHEE             455
   9  1258       LAKE JESSIE                419
  10  1219       LAKE HORSESHOE             406
  II  1215       LAKE HA1NES                396
  12  1238       LAKE SOUTH                 366
  13  1232       LAKE OKEECHOBEE            368
  14  1220       LAKE MARION                366
  15  1206       LAKE CRESCENT              346
  t&  tgj*       LAKE POlNSeiT              342
  17  1207       DOCTORS LAKE               341
  18  1236       LAKE REEDY                 337
  19  1211       LAKE GIBSON                324
  20  120(4       LAKE DORA                  297
  21  1239       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
  '8  ' fit',       I  «KF irriHl"iPFK,»f "fin          •>'<)

-------
LAKES RANKED av INDEX NOS.
RANK  LAKE CODE  LAKE NAME               INDEX NO
29
30
31
32
33
3*
35
36
37
38
39
40
41
1231
1217
1252
1264
1220
1203
1223
1201
1242
1249
12*7
1227
1209
LAKE MONROE
LAKE HANCOCK
LAKE ELOISE
PAYNE'S PRAIRIE LAKE 
-------
     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

-------
    APPENDIX C
TRIBUTARY FLOW DATA

-------
                                   TRIBUTARY FLOW INFORMATION FOR FLORIDA
                                                                             8/25/75
LAKE CODE 1208
      DORA LAKE
     TOTAL DRAINAGE AREA OF LAKE(SO KM)
                              b!3.8
          SUB-DRAINAGE
TRIBUTARY  AREA(SQ KM)
1208A1
120881
1208ZZ
613.8
  1.1
118.2
 JAN

3.37
0.02
0.31
 FEB

3.65
0.02
0.40
 MAR

4.70
O.u3
0.65
 APR

4.76
0.03
0.45
                        TOTAL DRAINAGE AREA OF LAKE =
                        SUM UF SUB-DRAINAGE AREAS   =
     MEAN MONTHLY FLOWS AND DAILY FLOWS(CMS)

TRI6UTARY   MONTH   YEAR    MEAN FLOW  DAY

1208A1
120881
1208ZZ
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
3.11
1.19
0.85
0.40
1.36
1.53
1.22
2.97
2.38
0.93
0.34
0.79
0.02
0.02
0.01
0.02
0.02
0.02
0.03
0.02
0.01
0.01
0.02
0.01
0.25
0.34
0.02
0.08
0.07
0.22
0.37
0.28
0.05
0.10
0.12
0.03
17
8
20
18


15

4
9
6
3
17
8
20
18


15

4
9
6
3
17
8
20
18


15

4
9
6
3
 MAY

2.32
0.02
0.11
                                             613.8
                                             119.3
                                                   NORMALIZED FLOWS(CMS)
                                                     JUN     JUL     AUG
2.63
0.02
0.11
2.89
0.02
0.34
4.47
0.03
0.59
 SEP

5.47
0.04
0.85
 OCT

3.37
0.03
0.65
 NOV

2.b5
0.02
0.40
 DEC

1.95
0.02
0.25
MEAN

3.51
0.03
0.43
                                                                   SUMMARY
                                                     TOTAL FLOW  IN
                                                     TOTAL FLOW  OUT
                                                                   5.43
                                                                  42.14
                                      FLOW  DAY

                                      2.01
                                      3.88
                                     •0.54
                                     •1.16
                                      2.92

                                      4.05
                                     -0.51
                                      0.28
                                     •1.13
                                      0.02
                                      0.03
                                      0.01
                                      0.01
                                      0.02

                                      0.01
                                      0.01
                                      0.02
                                      0.01
                                      0.18
                                      0.59
                                      0.01
                                      0.01
                                                   0.28

                                                   0.06
                                                   0.04
                                                   0.18
                                                   0.04
                                            FLOW   DAY
                                                      FLOW

-------
        APPENDIX D
PHYSICAL and CHEMICAL DATA

-------
STORE! RETRIEVAL DATE 75/08/?5
                                                                  120801
                                                                 28 47  20.0  081  42  45.0
                                                                 LAKE DORA
                                                                 12069    FLORIDA

DATE
FROM
TO
73/03/12

73/09/06
73/11/05



DATE
FROM
TO
73/03/12

73/09/06
73/11/05


TIME DEPTH
OF
DAY FEET
15 50 0000
15 50 0006
14 45 0000
16 20 0000
16 20 0001
16 20 0006

TIME DEPTH
OF
DAY FEET
15 50 0000
15 50 0006
14 45 0000
16 20 0000
16 20 0006
00010
WATER
TEMP
CENT
25.8
24.6
29.8
23.3
23.3
23.2
00665
PHOS-TOT

MG/L P
0.138
0.085
0.065
0.072
0.078
00300
DO

MG/L

10.6
9.8

10.4
10.6
32217
CHLRPHYL
A
UG/L
36.7

69.0
31.3

                                          00077      00094
                                         TRANSP    CNDUCTVY
                                         SECCHI    FIELD
                                         INCHES    MICROMHO
                                              25

                                              12
                                              18
310
300
357
310
310
311
11EPALES
3
00400
PH
SU
9.70
9.60
9.10
9.20
00410
T ALK
CAC03
MG/L
105
105
99
103
2111202
0010 FEET DEPTH
00610
NH3-N
TOTAL
MG/L
0.100
0.140
0.090
0.090
00625
TOT KJEL
N
MG/L
2.500
2.500
2.500
3.200
00630
N02&N03
N-TOTAL
MG/L
0.140
0.190
0.130
0.090
00671
PHOS-DIS
ORTHO
MG/L P
0.011
0.014
0.020
0.030
                                                                9.30
104
0.110
3.200
0.130
0.038

-------
STORET RETRIEVAL DATE 75/CB/25
 130802
2B <*7 05.0 081
LAKE DORA
12069   FLORIDA
                                                                                    53.0
DATE
FROM
TO
73/03/12

73/09/06

73/11/05



DATE
FROM
TO
73/03/12

73/09/06

73/11/05

TIME DEPTH
OF
DAY FEET
16 20 0000
16 20 0006
14 55 0000
14 55 0008
16 32 0000
16 32 0001
16 32 0005

TIME DEPTH
OF
DAY FEET
16 20 0000
16 20 0006
14 55 0000
14 55 0008
16 32 0000
16 32 0005
00010
WATER
TEMP
CENT
24.0
23.5
29.2
28.3
22.6
22.6
22.6
00665
PHOS-TOT

MG/L P
0.093
0.100
0.074
0.118
0.099
0.108
11EPALES 2111202
3 0009 FEET DEPTH
00300 00077 00094 00400 00410 00610 00625 00630 00671
DO TRANSP CNDUCTVY PH T ALK NH3-N TOT KJEL N02&N03 PHOS-DIS
SECCHI FIELD CAC03 TOTAL N N-TOTAL ORTrtO
MG/L INCHES MICROMHO SU

11.1 .
9.2
7.6

9.8
9.6
32217
CHLRPHYL
A
UG/L
44.8

71.8

63.9

15 320 9.70
320 9.70
18 358 9.00
515 8.80
18 311 9.30
311
311 9.30










MG/L MG/L MG/L MG/L MG/L P
109 0.130 2.500 0.160 0.012
112 0.150 2.800 0.200 0.018
100 0.090 3.900 0.120 0.022
99 0.120 4.400 0.140 0.034
108 0.110 3.900 0.110 0.038

108 0.180 3.800 0.170 0.076











-------
STORE! RETRIEVAL DATE 75/08/25
                                                                  120803
                                                                 28 47 45.0 081 39 37.0
                                                                 LAKE DORA
                                                                 12069   FLORIDA

DATE
FROM
TO
73/03/12

73/09/06

73/11/05



TIME DEPTH
OF
DAY FEET
16 55 0000
Ib 55 0006
15 10 0000
15 10 0009
16 42 0000
16 42 0001
16 42 0006
00010
MATER
TEMP
CENT
25.0
23.6
29.1
28.4
23.0
23.0
23.0
                                00300     00077
                                 DO      TRANSP   O
                                         SECCHI   FIELD
                                MG/L     INCHES   Ml
                                  10.0
                                  10.2
                                  11.2
                                  11.2
15

16

17
                                                                 11EPALES
                                                                 3
                                        2111202
                                       0010 FEET
                                                                                                DEPTH
194
:TVY
i
IMHO
325
310
363
960
323
323
323
00400
PH

SU
9.70
9.60
9.1U

9.40

9.40
00410
T ALK
CAC03
MG/L
110
115
102



105
00610
NH3-N
TOTAL
MG/L
0.100
0.140
0.080



0.100
00625
TOT KJEL
N
MG/L
2.600
3.000
4.400

3.500

3.800
00630
N02&N03
N-TOTAL
MG/L
0.140
0.190
0.100



0.130
00671
PHOS-DIS
ORTHO
MG/L P
0.011
0.016
0.026



0.045
                      00665     32217
  DATE   TIME DEPTH PHOS-TOT  CHLRPHYL
  FROM    OF                     A
   TO    DAY  FEET   MG/L P     UG/L

73/03/12 16 55 0000    0.104      66.5
         16 55 0006    0.137
73/09/06 15 10 0000    U.115      99.8
73/11/05 16 42 0000    0.106      56.0
         16 42 0006    0.117

-------
       APPENDIX E
TRIBUTARY and WASTEWATER
  TREATMENT PLANT DATA

-------
bTORET RETRIEVAL DATE 75/OS/25
                                                                  1208A1
                                                                 26 48 00.0 081 44 30.0
                                                                 DORA CANAL
                                                                 1201V   7.5 EUSTIS
                                                                 T/DORA LAKE
                                                                 DUNCAN LW BrtDG W OF TAVAKtES
                                                                 11EPALES             2111204
                                                                 4                   0000 FEET
DEPTH
DATE
FROM
TO
73/OJ/17
73/04/08
73/05/20
73/06/18
73/09/15
73/11/04
TIME DEPTH
OF
DAY
11
11
10
11
08
13
00630 00625
N02*N03 TOT KJEL
N-TOTAL
FEET
43
10
10
00
30
45
MG/L
0.
0.
0.
0.
0.
0.
010K
010K
016
010K
010*
Olb
N

MG/L
2.
3.
2.
3.
2.
1.
900
200
310
580
720
750
00610
NH3-N
TOTAL
MG/L
0.019
0.042
0.060
0.050
0.015
0.840
00&71
PriOS-DIS
00665
PHOS-TOT
ORTHO
MG/L
0.
C.
C.
0.
0.
0.
p
022
022
030
020
021
012
MG/L
0.
0.
0.
0.
0.
0.
p
130
135
150
030
085
080
               K VALUE KNOWN TO BE
               LESS THAN INDICATED

-------
       *ETf6NOJ
  FHOM    OF
   TO    DAY  FEET

73/03/17 11 ?1
73/04/OH 11 00
73/05/20 09 ?5
73/06/ltJ 11 15
73/09/15 08 15
73/12/0^ 10 ?0
7*/01/06 10 40
74/02/03 13 45
 120841
23 4tt 00.0 081 40 30.0
UNNAMEU CHEEK
12      7.S EOSTIS
T/OORA LAKE
ST H«Y *»52 dROo bELO OAKLAND PARK
HEPALES
                                                                                                    STP
 211120^
0000 FEET
                                                                                                 DEPTH
0630
6N03
OTAL
G/L
0.013
O.Obd
0.084
0.017
0.015
0.012
O.OS2
0.0^8
00625
TOT KJEL
N
MG/L
7.800
3.400
6.300
19.900

4.600
9.500
11.000
00610
NH3-N
TOTAL
MG/L
4.800
1.500
3.000
6.720
o.lSO
3.700
5.600
7.200
00671
PHOS-DIS
OkTHO
MG/L P
0.069
0.220
0.132
0.170
0.550
0.176
0.164
0.120
00665
PHOS-TOT

MG/L P
0.390
0.480
0.560
3.400
1.350
0.470
3.500
0.990

-------
RETRIEVAL DATE 75/08/^5
                                                            1208tJA           TF120Q800
                                                          26 48 30.0 081 40 30.0
                                                          MOUNT DOHA
                                                          12019   7.5 EUSTIS
                                                          D/LAKE DOHA
                                                          LAKE OORA
HEP ALES
DATE
FROM
TO
73/05/02
CP(T)-
73/05/02
73/11/21
TIME DEPTH
OF
DAY FEET
11 00
16 00
15 00
N02&N03
N-TOTAL
MG/L
0.081
0.340
00625
TOT KJEL
N
5.610
12.500
00610
NM3-N
TOTAL
MG/L
2.000
9.500
00671
PHOS-DIS
ORTHO
MG/L P
0.232
0.110
00665
PHOS-TOT
MG/L P
0.620
0.550
50051
FLOW
RATE
INST MGO
0.297
0.450
2141
0000 H
50053
CONDUIT
FLOw-MGO
MONTHLY
0.323
0.412

-------