U.S. ENVIRONMENTAL PROTECTION AGENCY
               NATIONAL EUTROPHICATION SURVEY
                        WORKING PAPER SERIES

                                               REPORT
                                                 ON
                                             mm LAKE
                                       BANDERA AND MEDINA COUNTIES
                                                TEXAS
                                             EPA REGION VI
                                          WORKING PAPER No, 652
     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
                           MEDINA LAKE
                   BANDERA AND MEDINA COUNTIES
                              TD(AS
                          EPA REGION VI
                      WORKING PAPER No, 652
WITH THE COOPERATION OF THE
 TEXAS WATER QUALITY BOARD
          AND THE
    TEXAS NATIONAL GUARD
       FEBRUARY/ 1977

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                               CONTENTS
                                                           Page
  Foreward                                                   ii
  List of Texas  Study Reservoirs                              iv
  Lake and Drainage Area  Map                                  vi

  Sections
  I.  Conclusions                                              1
 II.  Lake and Drainage Basin  Characteristics                  3
III.  Lake Water Quality  Summary                               4
 IV.  Nutrient Loadings                                      10
  V.  Literature Reviewed                                    15
•VI.  Appendices                                             16

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                                 n
                          FOREWORD
    The National Eutrophication Survey was initiated in 1972 in
response to an Administration commitment to investigate the nation-
wide threat of accelerated eutrophication to freshwater lakes and
reservoirs.

OBJECTIVES

    The .Survey was designed to develop, in conjunction with state
environmental agencies, information on nutrient sources, concentrations,
and impact on selected freshwater lakes as a basis for formulating
comprehensive and coordinated national, regional, and state management
practices relating to point-source discharge reduction and non-point
source pollution abatement in lake watersheds.

ANALYTIC APPROACH

    The mathematical and statistical procedures selected for the
Survey's eutrophication analysis are based on related concepts that:

        a.  A generalized representation or model relating
    sources, concentrations, and impacts can be constructed.

        b.  By applying measurements of relevant parameters
    associated with  lake degradation, the generalized model
    can be transformed into an operational representation of
    a lake, its drainage basin, and related nutrients.

        c.  With such a transformation, an assessment of the
    potential for eutrophication control can be made.

LAKE ANALYSIS

    In this report,  the first stage of evaluation of lake and water-
shed data collected  from the study lake and its drainage basin is
documented.  The report is. formatted to provide state environmental
agencies with specific information for basin planning [§303(e)], water
quality criteria/standards review [§303(c)], clean lakes [§314(a,b)j,
and water quality monitoring [§106 and §305(b)] activities mandated
by the Federal Water Pollution Control Act Amendments of 1972.

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                                Ill
     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.

ACKNOWLEDGEMENT

     The staff of the National Eutrophication Survey (Office of
Research & Development, U. S. Environmental  Protection Agency)
expresses sincere appreciation to the Texas  Water Quality Board
for professional involvement, to the Texas National  Guard for
conducting the tributary sampling phase of the Survey, and to
those Texas wastewater treatment plant operators who voluntarily
provided effluent samples.

     Hugh C.  Yantis, Jr., Executive Director of the Texas Water
Quality Board, and John B. Latchford, Jr., Director, and the staff
of the Field Operations Division provided invaluable lake documen-
tation and counsel during the Survey, reviewed the preliminary
reports, and provided critiques most useful  in the preparation of
this Working Paper series.

     Major General Thomas Bishop, the Adjutant General of Texas,
and Project Officer Colonel William L. Seals, who directed the
volunteer efforts of the Texas National Guardsmen, are also grate-
fully acknowledged for their assistance to the Survey.

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                                 iv
                  NATIONAL EUTROPHICATION SURVEY
                         STUDY RESERVOIRS
                          State of Texas
NAME
Amistad
Bastrop
Bel ton
Braunig
Brownwood
Buchanan
Caddo
              •
Calaveras
Canyon
Colorado City
Corpus Christi
Diversion
Eagle Mountain
Fort Phantom Hill
Houston
Kemp
Lake O'The Pines

Lavon
Lewisvilie (Garza-Little Elm)
Livingston
COUNTY
Val Verde
Bastrop
Bell, Coryell
Bexar
Brown
Burnet, Llano
Harrison, Marion, TX;
Caddo Parish, LA
Bexar
Comal
Mitchell
Jim Wells, Live Oak, San
Patricio
Archer, Baylor
Tarrant, Wise
Jones
Harris
Baylor
Camp, Marion, Morris,
Upshur
Coll in
Denton
Polk, San Jacinto, Trinity,
Walker

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Lyndon B. Johnson

Medi na

Meredith


0. C. Fisher (San Angelo)

Palestine


Possum Kingdom


Sam Rayburn



Somerville

E. V. Spence

Stamford

Still house Hollow

Tawakoni

Texoma


Travis

Trinidad

Twin Buttes

White River

Whitney

Wright Patman (Texarkana)
Burnet, Llano

Bandera, Medina

Hutchinson, Moore,
Potter

Tom Green

Anderson, Cherokee,
Henderson, Smith

Palo Pinto, Stephens,
Young

Angelina, Jasper
Nacogdoches, Sabine, San
Augustine

Burleson, Lee, Washington

Coke

Haskell

Bell

Hunt, Rains, Van Zandt

Cooke, Grayson TX; Bryan,
Johnston, Love, Marshall, OK

Burnet, Travis

Henderson

Tom Green

Crosby

Bosque, Hill

Bowie, Cass

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                       MEDINA LAKE
                     ^ Tributary Sampling Site
                     X Lake  Sampling Site
                     J  Sewage Treatment Facility
                     ^> Drainage  Area  Boundary

                     0        5	K>  Km.
                     4           ~~5     Mi.
                             Scale
K30
 I

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                                MEDINA LAKE
                              STORET NO. 4822

I.  CONCLUSIONS
    A.  Trophic Condition:
            Survey data indicate that Medina Lake is meso-eutrophic; i.e.,
        moderately well supplied with nutrients and productive.  Whether
        nutrient enrichment is beneficial or deleterious depends on the
        actual or potential effect on the uses of the lake.  In this
        regard, no nuisance conditions are known to personnel of the
        Texas Water Quality Board and there is little or no known impair-
        ment of the designated beneficial uses of the lake.
            Although it ranked sixteenth in overall trophic quality when
        the 39 Texas reservoirs sampled in 1974 were compared using a com-
        bination of six water quality parameters*, the lower ranking of
        this water body is largely due to the high median inorganic nitro-
        gen which does not necessarily indicate trophic quality in this
        case because the lake is phosphorus limited.  None of the other
        reservoirs had less but one had the same median total phosphorus,
        none of the others had less median dissolved orthophosphorus, all
        of the other reservoirs had less median inorganic nitrogen, 24 had
        less mean chlorophyll £, and four had greater mean Secchi disc
        transparency.  Marked depression or depletion of hypolimnetic
        dissolved oxygen occurred at all sampling stations in May and
        August and at three of the four stations in November.
            Survey limnologists did not observe macrophytes or surface con-
        centrations of algae.
* See Appendix A.

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B.  Rate-Limiting Nutrient:
        The algal assay results indicate Medina Lake was phosphorus
    limited at the time the sample was collected (11/05/74).  The
    lake data indicate phosphorus limitation at all sampling stations
    and times.
C.  Nutrient Controllability:
        1.  Point sources—During the sampling year, known point
    sources contributed 43.6% of the total phosphorus load to Medina
    Lake.  The wastewater treatment plant at Bandera accounted for an
    estimated 39.3% of the total, and septic tanks serving lakeshore
    dwellings accounted for an estimated 4.3%.
        The present phosphorus loading of 0.13 g/m2/year is less than
    that proposed by Vollenweider (Vollenweider and Dillon, 1974) as
    an oligotrophic loading (see page 14).  However, the lake is phos-
    phorus limited, and any reduction in point-source loads could be
    considered a means of maintaining the present quality of the lake.
        2.  Non-point sources—Non-point sources accounted for 56.4%
    of the total phosphorus load.  The Medina River contributed 29.7%
    and Red Bluff Creek contributed 3.5%.  The ungaged minor tribu-
    taries and immediate drainage contributed an estimated 9.5%.
        The phosphorus export rates of the Medina River and Red Bluff
    Creek were quite low during the sampling year (<1 kg/km2).

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II.   LAKE AND DRAINAGE BASIN  CHARACTERISTICS1"
     A.   Lake Morphometry  :
         1.   Surface area:  22.56 kilometers2.
         2.   Mean depth:   13.9  meters.
         3.   Maximum depth:   >36.3 meters.
         4.   Volume:  313.306 x 106 m3.
         5.   Mean hydraulic retention  time:   2.7  years  (based  on  outflow).
     B.   Tributary and Outlet:
         (See Appendix C  for  flow data)
         1.   Tributaries  -
                                               Drainage         Mean  flow
             Name                              area  (km2)ttt    (m3/sec)ttt
             Medina River                        1,227.7           3.510
             Red  Bluff Creek                        145.8           0.310
             Minor tributaries  &
              immediate drainage -                 246.0           0.670
                           Totals               1,619.5           4.490
         2.   Outlet -
             Medina River                        1,642.1*          3.671**
     C.   Precipitation***:
         1.   Year of sampling:   94.0 centimeters.
         2.   Mean annual:  70.0 centimeters.
 t  Table  of metric  conversions—Appendix  B.
 tt LiJtchford,  1974.
 ttt For  limits of  accuracy,  see Working  Paper  No.  175,  "...Survey Methods,
     1973-1976".
 *  Includes area of lake.
 ** Outlet flow adjusted to equal sum of  inlet  flows minus evaporation  (see
    page  10).
 *** See  Working Paper No. 175.

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III.  LAKE WATER QUALITY SUMMARY
      Medina Lake was sampled four times in 1974 by means of a pontoon-
  equipped Huey helicopter.  Each time, samples for physical and chemical
  parameters were collected from a number of depths at four stations on
  the lake (see map, page vi).  During each visit, a single depth-integrated
  (4.6 m to surface) sample was composited from the stations for phytoplank-
  ton identification and enumeration; and during the last 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
  36.3 meters at station 1, 30.2 meters at station 2, 26.8 meters at station
  3, and 14.6 meters at station 4.
      The sampling results are presented in full in Appendix D and are
  summarized in the following table (the August nutrient samples were
  not properly preserved and were not analyzed).

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PARAMETER

TEMP (C)

DISS OXY (MG/L)

CNDCTVY (MCHOMO)

PH (STAND UNITS)

TOT ALK (MG/L)

TOT P  (MG/L)

ORTHO P (MG/L)

N02*N03 (MG/D

AMMONIA (MG/L)

KJEL N  (MG/L)

INORG N (MG/L)

TOTAL N (MG/L)

CHLRPYL A  (UO./D

SECCHI  (METERS)
       A. SUMMftHY OF HTIYSICAL AND


       1ST SAMPLING (  3/12/74)

             4 SITES

     RANGE

 10.8  -  19.5

  4.2  -   9.6

 345.  -  420.

  7.6  -   8.1

 175.  -  197.

0.006  - 0.021
 MEAN   MEDIAN

 15.1    15.8

  8.0     8.8

 374.    373.

  7.9     8.0

 186.    187.

0.008   0.007
0.003  - 0.008

0.610  - 0.720

0.020  - 0.120
                 0.004   0.004

                 0.660   0.660

                 0.048   0.045

0.200  - 0.400   0.242   0.200

0.640  - 0.750   0.701   0.710
0.840  - 1.100

  1.7  -   2.9

  2.4  -   3.4
0.902   0.885

  2.4     2.5

  2.7     2.b
                 CHEMICAL CHAKACTEMISTICS FOK MEDINA LAKE
                  STORET COOE 4822

                            2ND SAMPLING ( 5/22/74)

                                  4 SITES

                          RANGE

                      12.3  -  27.4

                       0.1  -   8.0

                      365.  -  455.

                       7.3  -   8.3

                      149.  -  192.

                     0.006  - 0.162

                     0.002  - 0.008
                                                        MEAN   MEDIAN

                                                        21.9    25.2

                                                                 5.0

                                                                425.

                                                                 7.5
                   4.6

                  416.

                   7.7

                  165.    155.

                 0.020   0.009

                 0.003   0.003

                 0.585   0.570

0.020  - 0.070   0.037   0.035

0.200  - 0.500   0.229   0.200

                 0.621   0.605

                 0.814   0.790

                  42.3    51.7
                                      0.520  - 0.690
                                      0.560  - 0.710

                                      0.740  - 1.040

                                        3.3  -  62.6

                                        1.1  -   2.4
        3RD SAMPLING ( 8/15/74)

              4 SITES

      KANGE

  12.4  -  29.0

   0.0  -   7.8

  367.  -  473.

   7.5  -   8.4

OOOOOO  _«»«»«»*O«««««O«««ft««»»
MEAN
23.0
4.1
416.
8.0
MEDIAN
26.5
5.0
417.
8.0
                                        1.9
                                                                 2.0
                                                          O»0OO0


                                                          OOOOOO


                                                          OOOOOO


                                                          OOOOOO


                                                          o«00o0


                                                          OOOOOO


                                                             2.4


                                                             1.4
        ..OOO0O0OOOO000O00OOOOOO


        - tHHHHJO O OO1> OO O O O OOOO O O O


        -O0OO0OOO00O0OOO0O0OO0O


        -OOOOOOOOOOOOOOOOOOOOOO


        -0OOOOOO000O00OOO o 00000


        -.0000000000000000000000


        -   7.3     4.9     4.9


        -   3.7     2.6     2.7

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                             A.  SUMMAKY  OF  PHYSICAL  AND CHEMICAL CHARACTER 1ST ICS FUK MEDINA LAKE
                                                          STORET CODE
PARAMETER

TEMP  (C)

DISS OXY (MG/L)

CNOCTVY  (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 (U(VL>

SECCHI  (METERS)
4TH SAMPLING
                                                5/74)
4 SITES
RANGE MEAN
13.3
0.0
366.
7.3
146.
0.008
0.002
0.020
0.020
0.200
0.280
0.440
1.6
1.2
- 21.1
8.0
- 395.
8.1
- 201.
- 0.043
- 0.015
- 0.400
- 0.690
- 0.900
- 0.710
- 0.920
2.7
3.4
19.4
5.5
37b.
7.9
161.
0.015
0.007
0.223
0.119
0.326
0.342
0.549
2.1
2.5
MEDIAN
20.7
7.4
375.
8.0
151.
0.012
0.005
0.260
0.040
0.200
0.300
0.490
2.1
2.7

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B.  Biological characteristics:

    1.  Phytoplankton -
        Sampling
        Date

        03/12/74
        05/22/74
        08/15/74
        11/05/74
Dominant
Genera
1.
2.
3.
4.
5.
1.
2.
3.
4,
5.
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
Dinobryon SJD.
Chroomonas sp.
Coelastrum sp.
Fragilaria sp.
Cyclotella sp.
Other genera
Total
Microcystis (?) sp.
Fragilaria sp.
Coelastrum sp.
Cyclotella sp.
Cnlorophytan filaments
Other genera
Total
Microcystis s£.
Chlorophytan filaments
Scenedesmus s£.
Chroomonas SJD.
Cyclotella sp.
Other genera
Total
Cryptumonas sp.
Apnanothece s£.
Closterium sp.
Dactyl ococcops is sp.
Flagellates
Algal Units
per ml

   1,320
     543
     31
     272
     233
     427

   3,106

     607
     580
     359
     193
     166
     663
   2,5(-.8

     590
     461
     264
     19
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    2.  Chlorophyll a -
Sampling
Date
03/12/74
05/22/74
08/15/74
11/05/74
Station
Number
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
C.  Limiting Nutrient Study:

    1.  Autoclaved, filtered, and nutrient spiked -
                         Ortho P
                         Cone, (mg/1)
                                  Inorganic N
                                  Cone,  (mg/1)
    2.
                                                          Chlorophyll  a
                                                          (yg/D

                                                              2.8
                                                              2.2
                                                              2.9
                                                              1.7

                                                              3.3
                                                             62.6
                                                             62.6
                                                             40.9

                                                              6.6
                                                              7.3
                                                              2.4
                                                              3.3

                                                              2.5
                                                              1.6
                                                              1.7
                                                              2.7
Maximum yield
(mg/1-dry wt.)
Spike (mg/1)

Control
0.050 P
0.050 P + 1.0 N
1.0 N
Discussion -

    The control yield of the assay alga, Selenastrum capri-

cornutum, indicates that the potential  primary productivity
0.005
0.055 .
0.055
0.005
0.313
0.313
1.313
1.313
0.1
8.3
16.8
0.1

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of Medina Lake was low at the time the sample was collected
(11/05/74).  Also, the significant increase in yield with
the addition of phosphorus alone indicates that the lake
was phosphorus limited at that time.  Note that the addition
of nitrogen alone resulted in a yield no greater than that of
the control.                            s
    The lake data indicate phosphorus limitation as well.  The
mean inorganic nitrogen/orthophosphorus ratios were 40/1 or
greater at all sampling stations and times, and phosphorus
limitation would be expected.

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                                     10
IV.  NUTRIENT LOADINGS
     (See Appendix E for data)
     For the determination of nutrient loadings, the Texas National
 Guard collected monthly near-surface grab samples from each of the
 tributary sites indicated on the map (page vi), except for the high
 runoff months of April and May when two samples were collected.
 Sampling was begun in September, 1974, and was completed in August,
 1975.
     Through an interagency agreement, stream flow estimates for the
 year of sampling and a "normalized" or average year were provided by
 the Texas District Office of the U.S. Geological Survey for the
 tributary sites nearest the lake.  Outlet flow was adjusted to equal
 the sum of the inlet flows minus the yearly evaporation rate (an
 undetermined amount of water flows from the lake into the Edwards and
 Balconnes fault zone, part of which is above and part is below the
 lake; Yost, 1976).
     In this report, nutrient loads for sampled tributaries were
 calculated using mean annual concentrations and mean annual flows.
 Nutrient loads shown are those measured minus point-source loads, if any.
     Nutrient loads for unsampled "minor tributaries and immediate
 drainage" ("II" of U.S.G.S.) were estimated using the mean concentrations
 in the West Prong, Medina River at station D-l and the mean annual  II
 flow.
     The operator of the wastewater treatment plant at Bandera did not

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                                    11
participate; therefore, nutrient loads were estimated at 1.134 kg P and
3.401 kg N/capita/year, and flows were estimated at 0.3785 m3/capita/day.
    A.  Waste Sources:
        1.  Known municipal* -
                        Pop.                  Mean Flow       Receiving
        Name            Served    Treatment   (m3/d_)          Water
        Bandera         1,000     contact aer.    378.5       Medina River
        2.  Known industrial - None
* Anonymous, 1971.

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                                    12
    B.  Annual Total Phosphorus Loading - Average Year:
        1.  Inputs -
                                              kg P/           % of
            Source                            yr              total
            a.  Tributaries (non-point load) -
                Medina River                      855          29.7
                Red Bluff Creek                   100           3.5
            b.  Minor tributaries & immediate
                 drainage (non-point load) -      275           9.5
            c.  Known municipal STP's -
                Bandera                         1,135          39.3
            d.  Septic tanks* -                   125           4.3
            e.  Known industrial - None
            f.  Direct precipitation** -          395          13.7
                        Total                   2,885         100.0
        2.  Outputs -
            Lake outlet - Medina River          1,160
        3.  Net annual P accumulation - 1,725 kg.
* Estimate based on 445 lakeshore dwellings, see Working Paper No.  175.
** See Working Paper No. 175.

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                                    13
    C.  Annual Total Nitrogen Loading - Average Year:
        1.  Inputs -
                                              kg N/           % of
            Source                            y_r	           total
            a.  Tributaries (non-point load) -
                Medina River                  141,940          67.5
                Red Bluff Creek                19,160           9.1
            b.  Minor tributaries & immediate
                 drainage (non-point load) -   16,820           8.0
            c.  Known municipal STP's -
                Bandera                         3,400           1.6
            d.  Septic tanks* -                 4,745           2.2
            e.  Known industrial - None
            f.  Direct precipitation** -       24,355          11.6
                        Total                 210,420         100.0
        2.  Outputs -
            Lake outlet - Medina River         87,290
        3.  Net annual N accumulation - 123,130 kg.
    D.  Non-point Nutrient Export by Subdrainage Area:
        Tributary                             kg P/km2/yr     kg N/km2/yr
        Medina River                              <1             116
        Red Bluff Creek                           <1             131
* Estimate based on 445 lakeshore dwellings, see Working Paper No. 175.
** See Working Paper No. 175.

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                               14
E.  Mean Nutrient Concentrations in Ungaged Streams:
                                          Mean Total P    Mean Total N
    Tributary                             Cone, (mg/1)    Cone, (mg/1)
    Elm Creek                                 O.O'IO          3.444
    West Prong, Medina River                  0.013          0.796
F.  Yearly Loads:
        In the following table, the existing phosphorus loadings
    are compared to those proposed by Vollenweider (Vollenweider
    and Dillon, 1974).  Essentially, his "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".
        Note that 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             0.13       0.08        9.3        5.5

    Vollenweider phosphorus loadings
     (g/mVyr) based on mean depth and mean
     hydraulic retention time of Medina Lake:
        "Dangerous"  (eutrophic loading)            0.44
        "Permissible"  (oligotrophic loading)       0.22

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                                    15
V.  LITERATURE REVIEWED

    Anonymous, 1971.  Inventory of municipal waste facilities.  EPA
        Publ. OWP-1, vol. 6, Wash., DC.

    Latchford, John B., Jr., 1974.  Personal communication (lake mor-
        phometry).  TX Water Qual. Bd., Austin.

    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.

    Yost, I. D., 1976.  Personal communication (hydrologic budgets of
        Texas reservoirs).  U.S. Geol. Surv., Austin.

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                                  16
VI.   APPENDICES
                                   APPENDIX  A
                                  LAKE RANKINGS

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LAKE
CODE  LAKE NAME
4801  AMISTAD LAKE
4802  BASTROP LAKE
4803  BELTON RESERVOIR
4804  BRAUNIG LAKE
4805  BROWNWOOD LAKE
4806  LAKE BUCHANAN
4807  CAODO LAKE
4808  CALAVERAS LAKE
4809  CANYON RESERVOIR
4810  LAKE COLORADO CITY
4811  CORPUS CRISTI LAKE
4812  DIVERSION LAKE
4813  EAGLE MOUNTAIN LAKE
4814  FT PHANTOM HILL LAKE
4815  GARZA LITTLE ELM RESERVO
4816  KEMP LAKE
4817  HOUSTON LAKE
4818  LAKE OF THE PINES
4819  LAVON RESERVOIR
4820  LIVINGSTON LAKE
4821  LYNDON B JOHNSON LAKE
4822  MEDINA LAKE
4823  LAKE MEREDITH
4824  PALESTINE LAKE
4825  POSSUM KINGDOM RESERVOIR
4826  SAN ANGELO RESERVOIR
4827  SAM RAYBURN RESERVOIR
4828  E V SPENCE RESERVOIR
MEDIAN
TOTAL P
0.013
0.02?
0.016
0.134
0.027
0.036
0.055
0.038
0.010
0.042
0.113
0.025
0.024
0.060
0.045
0.023
0.097
0.031
0.063
0.196
0.042
0.010
0.021
0.031
0.023
0.098
0.029
0.036
MEDIAN
INOWG N
0.500
0.090
0.185
0.150
0.100
0.250
0.070
0.060
0.450
0.090
0.130
0.060
0.070
0.105
0.380
0.110
0.260
0.090
0.180
0.555
0.420
0.600
0.070
0.180
0,070
0.140
0.150
0.080
500-
MEAN SEC
371.474
419.917
378.312
461.625
470.375
437.625
463.333
461.667
384.812
473.625
475.187
470.111
469.625
474.909
475.782
455.000
486.187
440.000
485.333
465.469
456.500
403.562
439.312
442.625
419.045
481.000
439.458
462.583
MEAN
CHLORA
2.0^2
12.392
8.025
22.762
4.887
8.606
14.808
22.500
2.500
12.675
19.756
15.867
5.662
6.317
14.156
10.217
16.650
12.919
5.400
16.112
8.100
12.944
3.037
10.619
9.495
24.675
6.267
11.775
15-
MIN DO
14.900
15.000
15.000
14.800
14.400
15.000
11.400
13.000
14.800
10.200
14.000
9.000
11.000
9.800
14.600
10.400
12.400
15.000
8.800
15.000
14.900
15.000
14.400
14.800
15.000
10.200
15.000
15.000
MEDIAN
DISS ORTHO H>
0.009
0.007
0.007
0.062
0.007
0.012
0.013
0.007
0.006
0.012
0.050
0.009
0.008
0.022
0.018
0.007
0.036
0.011
0.018
0.128
0.013
0.004
0.009
0.010
0.009
0.011
0.009
0.008

-------
LAKE DATA TO BE USED IN RANKINGS

LAKE
CODE  LAKE NAME

4829  SOMEHVILLE LAKE

4830  STAMFORD LAKE

4631  STILLHOUSE HOLLOW RESEKV

4832  TAWAKONI LAKE

4833  TEXARKANA LAKE

4834  TEXOHA LAKE

4835  TRAVIS LAKE

4836  TRINIDAD

4837  TWIN BUTTES RESERVOIR

4838  WHITE RIVER RESERVOIR

4839  WHITNEY LAKE
MEDIAN
TOTAL P
0.053
0.073
0.018
0.046
0.106
0.042
0.018
0.389
0.029
0.020
0.028
MEDIAN
1NORG N
0.115
O.C60
0.160
0.100
0.120
0.160
0.250
0.110
0.250
0.110
0.120
500-
MEAN 5EC
473.833
482.714
406.250
466.417
478.500
451.321
389.913
479.500
454.917
434.500
430.500
ML. AN
CHLORA
24.491
18.457
3.917
18.246
19.119
12.493
5.595
24.300
8.708
4.333
6.912
lb-
MIN DO
13.000
10.600
15.000
13.200
12.400
15.000
15.000
10.000
14.800
15.000
15.000
MEDIAN
DISS 0*TnO P
0.013
0.012
0.010
0.013
0.030
0.018
0.007
0.240
0.009
0.009
0.008

-------
PERCENT OF LAKES WITH HIGHER VALUES (NUMBER OF LAKES aim
LAKE
CODE  LAKE NAME
4801  AMISTAO LAKE
4802  BASTROP LAKE
4803  8ELTON RESERVOIR
4804  BRAUNIG LAKE
4805  BROrfNWOOD LAKE
4806  LAKE BUCHANAN
4807  CADDO LAKE
4808  CALAVERAS LAKE
4809  CANYON RESERVOIR
4810  LAKE COLORADO CITY
4811  CORPUS CRIST I LAKE
4812  DIVERSION LAKE
4813  EAGLE MOUNTAIN LAKE
4814  FT PHANTOM HILL LAKE
4815  GARZA LITTLE ELM RESERVO
4816  KEMP LAKE
4817  HOUSTON LAKE
4818  LAKE OF THE PINES
4819  LAVON RESERVOIR
4820  LIVINGSTON LAKE
4831  LYNDON B JOHNSON LAKE
4832  MEDINA LAKE
4833  LAKE MEREDITH
4834  PALESTINE LAKE
4835  POSSUM KINGDOM RESERVOIR
4836  SAN ANGELO RESERVOIR
4837  SAM RAYBURN RESERVOIR
4fl38  E V SPENCE RESERVOIR
MEDIAN
TOTAL P
95
79
92
5
66
47
26
45
99
39
8
68
71
34
34
76
16
54
21
3
39
99
82
54
74
13
59
50
( 36)
( 30)
< 35)
( 2)
( 25)
( 18)
( 10)
( 17)
( 37)
( 14)
( 3)
< 26)
( 27)
( 9)
( 13)
< 29)
( 6)
( 20)
( 8)
( 1>
( 14)
< 37)
( 31)
( 20)
( 28)
< 5)
( 22)
( 19)
MEDIAN
INORG N
5
76
26
42
70
21
91
100
8
76
47
83
91
66
13
61
16
76
29
3
11
0
91
32
91
45
39
83
( 2)
( 28)
( 10)
( 16)
( 26)
( 7)
( 33)
( 38)
< 3)
( 28)
( 18)
( 31)
( 33)
( 25)
( 5)
(22)
( 6)
( 28)
( 11)
( 1)
( 4)
( 0)
( 33)
I 12)
( 33)
( 17)
( 15)
(31)
500-
MEAN SEC
100
82
97
50
29
74
42
47
95
26
18
32
34
21
16
55
0
66
3
39
53
89
71
63
84
8
68
45
( 38)
( 3D
( 37)
( 19)
( 11)
( 28)
( 16)
( 18)
( 36)
( 10)
( 7)
( 12)
( 13)
( 8)
( 6)
< 21)
( 0)
( 35)
( 1)
( 15)
( 20)
( 34)
< 37)
( 24)
( 32)
( 3)
( 26)
( 17)
MEAN
CHLOHA
100
47
68
8
87
63
32
11
97
42
13
29
79
74
34
55
24
39
84
26
66
37
95
53
58
0
76
50
( 38)
( 18)
( 26)
( 3)
( 33)
( 24)
( 12)
( 4)
( 37)
I 16)
( 5)
( 11)
( 30)
( 28)
( 13)
( 21)
( 9)
< 15)
( 32)
( 10)
( 25)
( 14)
( 36)
( 20)
( 22)
< 0)
( 29)
( 19)
15-
MIN DO
39
17
17
49
58
17
76
67
49
88
61
97
79
95
55
84
72
17
100
17
39
17
39
49
17
88
17
17
( 14)
( 0)
( 0)
( 17)
( 22)
( 0)
( 29)
( 25)
( 17)
( 33)
( 23)
( 37)
( 30)
( 36)
( 21)
( 32)
( 27)
( 0)
( 38)
( 0)
( 14)
( 0)
( 14)
( 17)
( 0)
( 33)
( 0)
( 0)
MEDIAN
OISS OHTHO P
63
92
84
5
84
39
30
92
97
39
8
63
76
16
21
92
11
46
21
3
30
100
63
51
63
46
63
76
( 21)
( 34)
( 31)
( 2)
( 31)
( 14)
( 10)
( 34)
( 37)
( 14)
( 3)
( 21)
( 28)
( 6)
( 7)
( 34)
( 4)
( 17)
( 7)
( 1)
( 10)
( 38)
( 21)
( 19)
( 21)
( 17)
( 21)
( 28)
INDEX
NO
40
-------
PERCENT OF LAKES WITH HIGHER VALUES (NUMBER OF LAKES WITH HIGHER  VALUES)

LAKE
CODE  LAKE NAME

4829  SOMERVILLE LAKE

4830  STAMFORD LAKE

4831  STILLHOUSE HOLLOW RESEHV

4832  TAWAKONI LAKE

4833  TEXARKANA LAKE

4834  TEXOMA LAKE

4835  TRAVIS LAKE

4836  TRINIDAD

4837  TWIN BUTTES RESERVOIR

4838  WHITE RIVER RESERVOIR

4839  WHITNEY LAKE
MEDIAN
TOTAL P
29
18
88
32
11
39
88
0
59
84
63
( 11)
( 7)
( 33)
( 12)
( 4>
( 14)
( 33)
( 0)
( 22)
( 32)
( 24)
MEDIAN
INORG N
55
97
37
70
51
34
21
61
21
61
51
( 21)
( 37)
( 14)
( 26)
( 19)
( 13)
( 7)
( 22)
( 7)
< 22)
( 19)
500-
MEAN SEC
24
5
87
37
13
61
92
11
58
76
79
( 9)
( 2)
( 33)
( 14)
( 5)
( 23)
< 35)
( 4)
( 22)
( 29)
( 30)
MEAN
CHLORA
3
18
92
21
16
45
82
5
61
89
71
( 1)
( 7)
( 35)
( 8)
( 6)
( 17)
( 3D
( 2)
( 23)
( 34)
( 27)
15-
MIN DO
67
82
17
63
72
17
17
92
49
17
17
.< 25)
( 31)
( 0)
( 24)
( 27)
( 0)
( 0)
( 35)
< 17)
( 0)
< 0)
MEDIAN
DISS 0*THO P
30 (
39 (
51 (
30 (
13 f
21 (
84 (
0 (
63 (
63 (
76 (
10)
14)
19)
10)
5)
7)
31)
0)
21)
21)
28)
INDEX
NO
200
259
372
2b3
176
217
384
169
311
390
357

-------
   CS RANKED BY INOEX NOSr




RANK  LAKE CODE  LAKE NAME                INDEX NO






   i  4809       CANYON RESERVOIR           445




   ?  4333       LAKE MEREDITH              <»41




   3  4813       EAGLE MOUNTAIN LAKE        430




   4  4816       KEMP LAKE                   423




   5  4801       AMISTAO LAKE               402



   6  4805       BROrfNWOOD  LAKE             394




   7  4802       BASTRUP LAKE               393




   8  4838       WHITE RIVEH RESERVOIR      390



   9  4825       POSSUM KINGDOM RESERVOIR   387



  10  4835       TRAVIS LAKE                384




  11  4803       BELTON RESERVOIR           384




  12  4831       STILLHOUSE HOLLOW RESERV   372



  13  4812       DIVERSION  LAKE             372



  14  4808       CALAVERAS  LAKE             362



  15  4839       WHITNEY LAKE               357




  16  4822       MEDINA LAKE                342



  17  4827       SAM RAYBURN RESERVOIR      322



  18  482B       E V SPENCE RESERVOIR       321



  19  4837       TWIN BUTTES RESERVOIR      311




  20  4810       LAKE COLORADO CITY         310



  21  4824       PALESTINE  LAKE             302



  22  4818       LAKE OF THE PINES          298




  23  4807       CADOO LAKE                 297



  24  4814       FT PHANTOM HILL LAKE       296



  25  4806       LAKE BUCHANAN             ' 261




  26  4830       STAMFORD LAKE              259



  27  4819       LAVON RESERVOIR            258




  28  4832       TAWAKONI LAKE              253

-------
LAKES RANKED BY INDEX NOS.



RANK  LAKE CODE  LAKE NAME               INDEX NO






  39  4821       LYNDON B JOHNSON LAKE      338




  30  4834       TEXOMA LAKE                217



  31  4829       SOMEKVILLE LAKE            208



  32  4826       SAN ANGELO HESERVOIR       200




  33  4833       TEXAKKANA LAKE             176



  34  4815       GARZA LITTLE ELM RESERVO   173




  35  4836       TRINIDAD                   169



  36  4804       BRAUNIG LAKE               159



  37  4811       CORPUS CRIST I LAKE         155




  38  4817       HOUSTON LAKE               139



  39  4820       LIVINGSTON LAKE             91

-------
    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 TEXAS
LAKE CODE 48?2     MEDINA RESERVOIR
     TOTAL DRAINAGE A*EA OF LAKE   1542.1
                                                                      OP/11/76
          SUB-DRAINAGE
TRIBUTARY  AREA'SQ KM)    JArg
              Ft3
MAR
APR
                                                          MAT
NORMALIZED FLOWS(CMS)
  JUN     JUL     AUG
                                                                      SEP
                                                        OCT
NOV
                                                                DEC
MEAN
482?A1
4822A2
4822B1
4822ZZ
1642.1
1227.7
145.8
269.4
1.59
2.55
0.22
0.43
1.93
3.06
0.20
0.51
1.78
3.28
0.21
0.54
1.76
3.62
0.31
0.68
2.72
4.76
0.62
1.10
3.54
4.25
0.27
0.71
t>.74
4.81
0.48
0.96
3.37
3.b8
0.40
0.76
2.97
2.97
0.40
0.68
3.40
4.22
0.28
0.71
2.52
2.66
0.22
0.48
1.67
2.24
0.12
0.37
2.84
3.51
0.31
0.67
                        TOTAL DRAINAGE AREA OF LAKE
                        SUM OF SUB-DRAINAGE AREAS

     MEAN MONTHLY FLOWS AND DAILY FLOWS(CMS)
TRIBUTARY   MONTH
4822A1
YEAR
                            MEAN FLOW  DAY
4822A2
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
74
74
74
74
75
75
75
75
75
75
75
75
74
74
74
74
75
75
75
75
75
75
75
75
4.53
1.67
6.63
4.59
7.36
13.14
9.06
4.47
17.92
15.40
8.95
2.15
5.75
3.71
6.80
6.97
6.97
23.11
8.21
5.80
24.01
12.20
7.67
3.57
7
6
7
7
7
7
7
7
9
8
14
2
7
6
7
7
7
7
7
8
9
8
14
2
                                     1642.1
                                     1642.8
                               FLOW  DAY
5.66
2.18
6.14
4.62
9.43
58.90
12.57
4.98
7.25
13.31
12.12
3.11
3.14
3.43
6.74
27.33
7.73
27.33
9.80
b.24
8.89
11.75
7.36
4.64







22
21










22
21



                                                                   SUMMARY
                                    TOTAL FLOW  IN  =     53.82
                                    TOTAL FLO* OUT =     33.98
                           FLOW  DAY
                                                                                       FLOW
                                                                     2.92
                                                                    22.94
                                                                     4.64
                                                                    23.93

-------
                                   TRIBUTARY FLO* INFORMATION FOR TEXAS

LAKE CODE 4822     MEDINA RESERVOIR

     MEAN MONTHLY FLOWS AND DAILY FLOWS(CMS)

TRIBUTARY   MONTH   YE.AR    MEAN FLOW  DAY         FLO*  DAY         KLOW  DAY
                                                         02/11/76
4822H1
4822ZZ
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
74
74
74
74
75
75
75
75
75
75
75
75
74
74
74
74
75
75
75
75
75
75
75
75
0.62
0.05
0.59
0.34
0.40
4.25
0.48
0.10
0.57
0.45
0.45
0.0
1.19
0.59
1.30
1.08
1.13
6.46
1.36
0.74
3.14
1.76
0.91
0.40
 7
 6
 7
 7
 7
 7
 7
 8
 9
 8
14
 2
                                                      FLOW
0.74
0.01
0.71
0.28
0.51
5.49
0.71
0.40
0.0
0.48
0.00
0.0
                                                          22
                                                          21
0.0
0.45

-------
        APPENDIX D





PHYSICAL and CHEMICAL DATA

-------
ET RETRIEVAL DATE 75/02/1 i
                                                               482201
                                                              29 32 27.0 098 56 01.0
                                                              MEu-INA LAKE
                                                              48325   IC.AAS
DATE
FROM
TO
74/03/12






74/05/22





74/08/15






74/11/05







00010
TIME DEPTH WATER
or TEMP
DAf FEET
10
10
10
10
10
10
10
10
10
10
10
10
10
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13
05
05
05
05
05
05
05
00
00
00
00
00
00
40
40
40
40
40
40
40
30
30
30
30
30
30
30
30
0000
0006
0022
0042
0062
0090
0117
0000
0005
0020
0030
0065
0119
0000
0010
0025
0039
0055
0085
0112
0000
0005
0020
0040
0065
0075
0090
0108
CENT
16
16
15
14
12
11
10
26
26
25
23
14
12
27
27
27
24
17
13
12
20
20
20
20
20
IS
13
13

.7
.6
.9
.2
.2
.5
.8
.4
.5
.2
.5
.1
.3
.1
.1
.0
.3
.5
.3
.4
.7
.7
.7
.7
.6
.6
.6
.3
00300
00
MG/L

9
9
9
8
7
4

8
8
8
4
1
7
7
7
1
1
1
0
7
7
7
7
6
0
0
0


.6
.4
.2
.6
.0
.4

.0
.0
.0
.0
.2
.6
.0
.6
.6
.4
.0
.2
.6
.6
.4
.4
.6
.2
.4
.0


00300
00

MG/L

9.6
9.4
9.2
8.6
7.0
4.4

8.0
8.0
8.0
4.0
1.2
7.6
7.0
7.6
1.6
1.4
1.0
0.2
7.6
7.6
7.4
7.4
6.6
0.2
0.4
0.0


00077 00094
TRANSP CNOUCTVY
SECCHI FIEuD
INCHES MICROMHO
132 375
375
370
360
345
345
360
95 442
438
426
416
368
365
144 416
415
415
426
397
369
367
120 370
368
367
366
366
381
371
370
11EK,
3
00400
PH

SU
6.00
8.00
8.00
8.00
8.00
7.75
7.60
8.30
8.25
8.00
7.90
7.50
7.45
8.40
8.40
8.40
7.70
7.80
7.80
7.80
8.06
8.04
8.02
7.99
7.95
7.39
7.43
7.39
iLES

00410
T ALK
CAC03
MG/L
166
188
188
192
192
194
197
149
149
155
155
187
184







151
148
148
147
149
186
195
201
2111202
0121
00610
NH3-N
TOTAL
MG/L
0.040
0.040
0.040
0.050
0.060
0.020K
0.020
0.030
0.020
0.030
0.030
0.020
0.040







0.030
0.030
0.030
0.030
0.030
0.040
0.220
0.450
FEET DEPTH
00625
TOT KJEL
N
MG/L
0.300
0.300
0.200
0.200
0.200
0.200
0.200
0.400
0.200K
0.200K
0.200K
0.200K
0.200K







0.200K
0.200K
0.200K
0.200K
0.200K
0.300
0.400
0.700
00630
N02&N03
N-TOTAL
MG/L
0.640
0.660
0.660
0.660
0.660
0.720
0.700
0.540
0.540
0.500
0.570
0.650
0.630







0.270
0.260
0.260
0.2t>0
0.260
0.400
0.120
0.020K
00671
PnOS-OIS
ORTHO
MG/L P
0.005
0.004
0.004
0.004
0.004
0.004
0.004
0.002
0.003
0.003
0.003
0.002
0.004







0.005
0.004
0.004
0.005
0.011
0.012
0.011
0.015
      K VALUE KNOWN TO BE
      LESS THAN INDICATED

-------
STORET KETRIEVAL DATE 76/02/11
                                                                  482301
                                                                  29  32  27.0  098  56  01.0
                                                                  MEDINA LAKL
                                                                          TE...AS
                      00665
  DATE   TIME DEPTH PHOS-TOT
  FPOM    OF
   TO    DAr  FEET   MG/L f
74/03/12






74/05/22







74/08/15


74/11/05









10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
13
13
13
13
13
13
13
13
13
13
13
13
13
05
05
05
05
05
05
05
00
00
00
00
00
00
00
00
40
40
40
30
30
30
30
30
30
30
30
30
30
0000
OOOb
0022
0042
0062
0090
0117
0000
0001
0005
0015
0020
0030
0065
0119
0000
0006
0039
0000
0001
0005
0020
0022
0040
0065
0075
0090
0108
0.007
0.008
0.007
0.006
0.006
0.006
0.009
0.009

o.ooe

0.008
0.006
0.008
0.009



0.017

0.010
0.010

•J.010
0.010
0.012
0.010
0.027
  32217
CHLRPHYL
   A
  UG/L

     2.8
  00031
INCDT LT
PERCENT
                                   3.3
                                            50.0

                                              1.0
6.6


2.5



50.0
1.0

50.0
1.0
                                                                  UEPALtS
                                                                  3
                                                        21112u2
                                                       0121 FEET
                                                        DEPTH

-------
bTOSET RETRIEVAL DATE 7(3/02'
                                                                  482202
                                                                 29 33 58.0 098 55  25.0
                                                                 MEDINA LAKE
                                                                 48019    rtAAS
DATE
FROM
TO
74/03/12





74/05/23





74/08/15





74/11/05







00010
TIME DEPTH WATER
OF TEMP
OAY FEET
11
11
11
11
11
11
11
11
11
11
11
11
14
14
14
14
14
14
14
14
14
14
14
14
14
14
00
00
00
00
00
00
00
00
00
00
00
00
10
10
10
10
10
10
20
20
20
20
?0
20
?0
20
0000
0006
0020
0045
0065
0096
0000
0005
0020
0050
0075
0099
0000
0010
0033
0050
0070
0092
0000
0005
0020
0035
0040
0060
0075
0096
CENT
18
16
15
13
12
11
26
26
25
17
13
12
28
28
26
17
14
13
20
20
20
20
20
20
15
13

.3
.9
.7
.8
.2
.2
.7
.6
.1
.7
.5
.6
.1
.0
.5
.8
.6
.1
.9
.9
.9
.9
.9
.7
.3
.7
00300
00
MG/L

9
9
9
7
4

6
7
1
3
0
7
7
5
0
0
0
7
7
7

7
6
0
0


*
•
•
•
•

•
•
•
•
•
•
•
•
•
•
•
•
*
•

•
*
•
•


2
2
0
2
2

0
8
8
0
7
8
6
8
<+
0
6
4
2
0

2
4
2
0
IIE^ALES

00300
00

MG/L

9.2
9.2
9,0
7.2
4.2

6.0
7.8
1.8
3.0
0.7
7.8
7.6
5.8
0.4
0.0
0.6
7.4
7.2
7.0

7.2
6.4
0.2
0.0

00077 00094
T«aNSP CNDUCTVY
SECCHI FIELD
INCHES MICWOMHO
108 390
385
375
360
350
350
96 438
433
423
393
368
373
96 423
421
417
403
381
372
132 372
371
371
370
369
369
381
375
3
00400 '
KH

su
8.00
8.00
8.00
7.90
7.85
7.60
8.00
8.00
7.60
7.50
7.4Q
7.40
8.40
8.40
8.10
7.50
7.70
7.75
8.09
8.07
8.05
8.05
8.03
7.92
7.37
7.35

00410
T ALK
CAC03
MG/L
175
179
183
187
188
190
149
149
152
186
189
192






153
153
153

154
153
184
199
211
0100
00610
NH3-N
TOTAL
MG/L
0.030
0.040
0.040
0.060
0.050
0.030
0.040
0.040
0.030
0.020
0.030
0.040






0.040
0.030
0.020

0.040
0.050
0.190
0.690
1202


FEET DEPTH
00625
TOT KJEL
N
MG/L
0.300
0.300
0.300
0.200
0.200K
0.20 OK
0.200
0.200K
0.200K
0.200K
0.200K
0.200K






0.400
0.200
0.200

0.200
0.300
0.400
0.900
00630
N02&N03
N-TOTAL
MG/L
0.610
0.630
0.650
0.640
0.650
0.690
0.580
0.55C
0.550
0.690
0.680
O.MO






0.250
0.260
0.260

0.260
0.260
0.120
0.020K
00671
PriOS-UlS
ORTHO
MG/L P
O.OOJ
0.004
0.004
0.004
0.005
0.008
0.004
0.004
0.007
0.003
0.002
0.002






0.012
0.006
0.013

0.005
0.006
0.010
0.005
           K  VALUE  KNOWN TO BE
           LESS  THAN  INDICATED

-------
STORE! RETRIEVAL DATE 7b/G2/ll
                                                                  482202
                                                                 29 33 58.0  098 55  25.0
                                                                 MEOINA LAKE
                                                                          H'MS
                                                                  11EPALES
                                                                  3
 2111202
0100 FEET
                                                                                                 DEPTH
OATE
FROM
TO
74/03/12





74/05/23





74/08/15

74/11/05







00665 32217 00031
TIME DEPTH PHOS-TOT CHL«PHYL 1NCOT LT
OF A REMNING
DAY FEET
1
1
1
1


1
1
1
1
1
1
14
14
14
14
14
14
14
14
14
14
00
00
00
00
00
00
00
00
no
00
00
00
10
10
20
20
20
20
20
20
20
20
0000
0006
0020
0045
0065
0096
0000
0005
0020
0050
0075
0099
0000
0033
0000
0005
0020
0022
0040
0060
0075
0096
MG/L P JG/L PERCENT
0
0
0
0
0
0
0
0
0
0
0
0


0
0
0

0
0
0
0
.006 2.2
.006
.006
.006
.007
.011
.OU7 62.6
.006
.007
.008
.007
.012
7.3
1.0
.011 1.6
.009
.023
1.0
.008
.008
.010
.013

-------
STORE! RETRIEVAL DATE 76/02/11
                                                                  482203
                                                                 29 32 25.0 098 56 00.0
                                                                 MEDINA LAKF
DATE
FROM
TO
74/03/12




74/05/23





74/08/15




74/11/05






00010
TIME DEPTH WATER
OF TEMP
DAY FEET
14
14
14
14
14
11
11
11
11
11
11
14
14
14
14
14
15
15
15
15
15
15
15
20
20
20
20
20
?5
25
25
25
?5
25
40
40
40
40
40
05
05
05
05
05
05
05
0000
0006
0020
0040
008b
0000
0005
0015
0045
0070
0088
0000
0010
0032
0045
0070
0000
0005
0020
0040
0060
0070
0083
CENT
18.
17.
17.
13.
1 1.
27.
26.
25.
19.
13.
12.
27.
27.
26.
19.
14.
21.
21.
21.
21.
20.
16.
16.

2
5
0
4
y
3
5
9
0
5
d
8
5
5
4
8
1
1
1
0
5
5
9
00300
DO
MG/L

9
9
9
6

8
7
1
1
0
7
7
5
0
0
8
7
7
7
4
0
0


.
.
.
.

.
.
.
.
.
.
•
.
.
.
.
.
.
.
.
.
.


2
0
0
4

0
0
0
0
1
2
0
0
2
6
0
6
6
8
8
2
4
IIE'-'ALES

00300
DO

MG/L

9.2
9.0
9.0
6.4

8.0
7.0
1.0
1.0
0.1
7.2
7.0
5.0
0.2
0.6
a.o
7.6
7.6
7.8
4.8
0.2
0.4

00077 00094
THANSP CNOUCTVY
SECCHI FIELD
INCHES MICROMHO
96 405
395
390
360
350
65 449
440
429
400
372
372
120 424
430
428
410
387
96 376
376
375
374
391
393
395
3
00400
PH

su
8.05
8.00
8.00
8.00
7.80
8.00
7.90
7.50
7.30
7.30
7.30
8.40
8.30
8.00
7.70
7.70
8.09
8.09
8.08
8.07
7.68
7.J4
7.36

00410
T ALK
CAC03
MG/L
182
183
182
186
190
1S3
155
152
182
184
187





148
148
146
148
149
189
199
211
0090
00610
NH3-N
TOTAL
MG/L
0.050
0.040
0.040
0.050
0.060
0.030
0.040
0.060
0.050
0.070
0.060





0.040
0.040
0.050
0.030
0.060
0.320
0.560
1202


FEET DEPTH
00625
TOT KJEL
N
MG/L
0.300
0.200
0.200
0.200
0.200
0.200
0.200
0.200
0.200K
0.200K
0.300





0.400
0.200K
0.200K
0.200K
0.200K
0.500
0.700
00630
M02kN03
N-TOTAL
MG/L
0.670
0.660
0.660
0.650
0.670
0.580
0.600
0.560
0.630
0.580
0.520





0.250
0.260
0.250
0.260
0.240
0.020
0.020K
. 00671
PHOS-DIS
OHTHO
MG/L P
0.005
0.004
0.004
0.004
0.004
0.002K
0.004
0.002
0.003
0.003
0.004





0.011
0.010
0.007
0.004
0.002
0.005
0.002
           K VALUE KNOWN TO BE
           LESS THAN INDICATED

-------
STOREY RETRIEVAL DATE 76/02/11
                                                                  482203
                                                                 29 32 25.0 098 56 00.0
                                                                 MEDINA LAKE
                                                                         TLAAS
                                                                 11EPALE5
                                                                 3
 2111202
0090 FEET
                                                                                                DEPTH
DATE
FROM
TO
74/03/12




7<»/05/23





7>/08/15

74/11/05






00665 32217 00031
TIME DEPTH PHOS-TOT CHLRPHYL INCOT LT
OF A PENNING
DAY FEET
14
14
14
14
14
11
11
11
11
11
11
14
14
15
15
15
15
15
15
15
20
20
?0
20
20
25
?5
25
25
25
25
40
40
05
05
05
05
05
05
05
0000
0006
0020
0040
0086
0000
0005
001S
0045
0070
0088
0000
0032
0000
0005
0020
0040
0060
0070
0083
MG/L P UG/L PERCENT
0
0
0
0
0
0
0
0
0
0
0


0
0
0
u
a
0
0
.003 2.9
.008
.021
.006
.009
.007 62.6
.009
.071
.013
.017
.162
2.4
1.0
.011 1.7
.009
.023
.011
.043
.016
.019

-------
STOSET RETRIEVAL DAT£  76/02/11
                                                                   4*2204
                                                                  29 36 37.0 098 58 26.0
                                                                  MEDINA LAKE
                                                                  <*8019   T'-\AS

DATE
FROM
TO
74/03/12





74/05/23





74/08/15




74/11/05





TIME DEPTH
OP
DAY FEET
13 15 0000
13 IS 0006
13 15 0015
13 15 0020
13 15 0035
13 15 0048
11 45 0000
11 45 0005
11 45 0015
11 45 0025
11 45 0035
11 45 0046
15 05 0000
15 05 0005
15 05 0017
15 05 0030
15 05 0042
15 40 0000
15 40 0005
15 40 0015
15 40 0030
15 40 0046
00010
WATER
TEMP
CENT
19.5
18.8
17.1
16.6
12.9
12.5
27.4
27.3
27.0
25.6
22.6
20.3
28.9
29.0
28.1
27.5
22.3
20.8
20.8
20.8
20.7
20.7
11EPALES

00300
DO

MG/L


-------
STOREf RETRIEVAL DATE 7t,/02/ll
                                                                   4B2204
                                                                  29 36 37.0 098 58 26.0
                                                                  MEDINA LA*F.
                                                                  48019   ThAAS
                                                                  11EPALES
                                                                  3
 2111202
0052 FEET
DEPTH

DATE
FROM
TO
74/03/12





74/05/23





74/08/15

74/11/05





TIME DEPTH
or
OAY FEET
13 15 0000
13 15 0006
13 15 0015
13 15 0020
13 15 0035
13 15 0048
11 45 aooo
11 45 0005
11 45 0015
11 45 0025
11 45 0035
11 45 0046
15 05 0000
15 05 0017
15 40 0000
15 40 0005
15 40 0015
15 40 0030
15 40 0046
00665 32217 00031
PHOS-TOT CHL9PHYL INCDT LT
A REMNING
MG/L P UG/L PERCENT
0.009 1.7
0.014
0.009
0.007
0.009
0.011
0.014 40.9
0.011
0.010
0.010
0.022
0.044
3.3
1.0
0.017 2.7
0.015
0.014
0.016
0.017

-------
  APPENDIX E
TRIBUTARY DATA

-------
STOHET KETRIEV&L DATE 7&/03/10
  DATE   TIME DEPTH N02SN03
  FROM    OF
   TO    DAY  FEET
74/09/07
74/10/06
74/11/07
74/13/07
75/01/07
75/02/07
75/03/07
75/04/07
75/04/22
75/05/09
75/05/21
75/06/08
75/07/14
75/08/02
10 00
09 05
09 37
10 55
11 14
09 40
10 11
11 10
09 45
09 ?5
09 20
10 05
10 15
11 00
                                                                  4S22A1
                                                                 29 31 54.0 098 56 06.0 4
                                                                 MEDINA RIVER
                                                                 48053   7.5 MEDINA LAKE
                                                                 0/MEDINA LAKE
                                                                 SEC HO BRJG .5 MI S OF MEDINA DAM
                                                                 11EPALES             2111204
                                                                  0000 FEET  DEPTH  CLASS 00
10630
JSN03
rOTAL
*G/L
0.252
0.280
0.248
0.232
0.272
0.304
0.380
0.620
0.575
0.575
0.570
0.530
0.410
0.360
00625
TOT KJEL
N
MG/L
0.800
0.100
0.400
0.500
0.300
0.200
0.150
0.650
0.200
0.200
0.500
0.350
0.250
0.350
00610
NH3-N
TOTAL
MG/L
0.030
0.020
0.020
0.048
0.046
0.032
0.050
0.015
0.020
0.025
0.025
0.017
0.020
0.015
00671
PhOS-OIS
ORTHO
MG/L P
0.005K
0.005K
0.005
0.008K
0.005K
0.008K
0.005K
0.005K
0.005K
0.005
0.010
0.005K
0.005
0.005K
00665
PHOS-TOT

MG/L P
0.005
0.010K
0.010K
0.010K
0.010K
0.010*
0.010K

0.010
0.010K
0.010K
0.010K
0.020
0.010K
   K  VALUE  KNOWN  TO BE
   LESS  THAN INDICATED

-------
STORE:T RETRIEVAL DATE ?6/03/io
                                                                  4822A2
                                                                 29 40 52.0 099 56 35.0 4
                                                                 MEDINA RIVCR
                                                                 48      7.5 PIPE CREEK
                                                                 T/MEDINA LAKE
                                                                 ENG XING BftOG 1 MI N* OF JCT W RD 1283
                                                                 11EPALES             2111204
                                                                  0000 FEET  DEPTH  CLASS 00

DATE
FROM
TO
74/09/07
74/10/06
74/11/07
74/12/07
75/01/07
75/02/07
75/03/07
75/04/08
75/04/22
75/05/09
75/05/21
75/06/08
75/07/14
75/08/02

TIME DEPTH
OF
DAY FEET
12 50
10 00
10 30
11 45
11 SO
10 35
11 03
11 28
10 41
10 10
10 10
11 00
11 00
11 50
00630
N02&N03
N-TOTAL
MG/L
1.040
0.940
0.704
0.950
1.060
0.300
1.720
1.250
1.250
0.900
0.560
1.100
0.980
0.860
00625
TOT KJEL
N
MG/L
0.200
0.400
0.200
0.400
0.100K
0.100
0.100
0.350
0.600
0.650
0.600
0.475
0.150
0.450
00610
NH3-N
TOTAL
MG/L
0.015
0.020
0.010
O.OOflK
0.016
0.008K
0.015
0.040
0.025
0.035
0.030
0.015
0.010
0.015
00671
pHos-ms
ORTHO
MG/L P
0.005
0.005K
0.005
0.008K
0.005K
O.OOCK
0.005K
0.005K
0.005K
0.005
0.005
0.005K
0.005K
0.005K
OC665
PHOSrTOT

MG/L P
0.010
0.010K
0.010K
0.010*
0.010
0.010K
0.010K
C.010
0.010
0.060
0.050
0.010
0.020
0.020
   K  VALUE  KNOWN  TO  ee
   LESS  THAN  INDICATED

-------
STORET RETRIEVAL OAft 76/03/10
  DATE   TIME DEPTH N02S.N03
  FROM    OF
   TO    DAY  FEET
74/09/07
74/10/06
74/11/07
74/12/07
75/01/07
75/03/07
75/03/07
75/04/08
75/04/22
75/05/09
75/05/21
75/06/08
75/07/14
75/08/02
13 55
11 10
11 45
14 25
12 45
12 25
12 14
13 16
11 40
11 10
11 10
12 40
12 35
13 20
                                                                   4822A3
                                                                  29  51  15.0  099  17  05.0  4
                                                                  MEDINA RlVCr*
                                                                  46       BANOEhiA  CO MAP
                                                                  T/MEDINA LAKE
                                                                  HWY  tJRDG 16 4 MI NNW  OF MEDINA
                                                                  11EPALES             2111204
                                                                   0000 FEET  DEPTn   CLASS 00
0630
IS.N03
OTAL
IG/L
0.460
0.384
0.448
0.600
0.680
1.B20
0.950
0.575
0.500
0.450
0.410
0.990
0.430
0.630
00625
TOT KJEL
N
MG/L
0.150
0.100
0.600
0.400
0.100K
0.200
0.350
0.400
0.150
0.300
0.150
0.200
0.100
0.200
00610
NH3-N
TOTAL
MG/L
0.025
0.015
0.015
0.024
0.008
0.008K
0.010
0.025
0.020
0.025
0.020
0.020
0.015
0.005
00671
PHOS-DIS
ORTHO
MG/L P
0.005K
0.005K
0.015
0.016
0.005K
0.008K
0.005K
0.005K
0.005K
0.005K
0.005K
0.005K
0.005K
0.020
00665
PMOS-TOT

MG/L P
0.005K
0.010K
0.015
0.016
0.010K
0.010K
0.010K
0.020
0.010K
0.010K
0.010K
0.010K
0.010K
0.020
   K  VALUE  KNOWN  TO BE
   LESS  THAN  INDICATED

-------
STORE! RETRIEVAL DATE 70/03/10
                                                                  4822A4
                                                                 29 51 30.0 093 19 45.0 4
                                                                 N PRONG MECINA RIVER
                                                                 48      BANDERA CO MAP
                                                                 T/MEDINA LAKE
                                                                 FM2107 RU 8WDG 5.5 MI NW OF MEDINA
                                                                 lltPALES             21112CK.
                                                                  0000 FEET  DEPTH  CLASS 00
DATE
FROM
TO
74/09/07
74/10/06
74/11/07
74/12/07
75/01/07
75/02/07
75/03/07
75/04/08
75/04/22
75/05/09
75/05/21
75/06/08
75/07/14
75/08/02
00630 00625
TIME DEPTH N02&N03 TOT KJEL
OF N-TOTAL N
DAY FEET
14
11
12
14
13
14
12
14
11
11
11
13
12
13
10
30
00
45
00
50
36
01
50
20
20
20
50
55
MG/L
0
0
0
0
0
0
0
0
0
0
0
0
0
0
.1*2
i 144
.368
.672
.790
.945
.780
.540
.330
.345
.390
.490
.315
.210
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
400
100
400
400
100
100K
050
100
650
250
450
250
300
700
00610 00671 00665
NH3-N PHOS-DIS PHOS-TOT
TOTAL ORTHO
MG/L
0.
0.
0.
0.
0.
c.
0.
0.
0.
0.
0.
0.
0.
0.
097
015
010
016
006
008K
010
040
030
030
030
015
015
025
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
P
005K
005K
005
008K
005K
008K
005K
005K
005K
005K
005K
005K
005K
005K
MG/L P
0.005K
0.0 ION
0.010K
0.010K
0.010K
0.010K
0.010K
0.010K
0.010K
0.010K
0.010K
0.010K
0.020
0.010K
  K VALUE KNOWN TO 8E
  LESS THAN  INDICATED

-------
STORET RETRIEVAL DATE 76/03/lU
                                                                  4822B1
                                                                 29 40 25.0 098 57 *0.0 4
                                                                 RED MLUFF C
-------
STORET RETRIEVAL .DATE Vb/03/lG
                                                         4822C1
                                                        29 36 12.0 098 55 50.0 4
                                                        ELM CREEK
                                                        48      7.S MEDINA LAKE
                                                        T/MEDINA LAKE
                                                        2NORY RO BRDG 0.2 MI SW JCT RO 1283
                                                        11EPALES             2111204
                                                         0000 FEET  DEPTH  CLASS 00
                                                                                                       37
  DATE   TIME DEPTH N02&N03
  FROM    OF
   TO    DAY  FEET
74/09/07
74/10/06
74/11/07
74/12/07
75/01/07
75/02/07
75/03/07
75/04/OB
75/04/22
75/05/09
75/05/21
75/06/08
75/07/14
75/08/02
10 45
09 35
10 05
11 25
11 30
10 02
10 40
10 15
10 04
09 45
09 35
10 25
10 35
11 19
0630
&N03
OTAL
G/L
4.700
2.880
2.240
1.100L
2.700
1.500
5.000
4.400
4.200
3.800
3.450
3.100
2.800
2.800
00625
TOT KJEL
N
MG/L
0.200
0.100
0.500
0.300
0.100
0.100K
0.250
0.200
0.300
0.450
0.150
0.400
0.100
0.400
00610
NH3-N
TOTAL
MG/L
0.030
0.040
0.015
0.016
0.016
0.016
0.035
0.025
0.015
0.025
0.005
0.020
0.015
0.015
00671
PHOS-DIS
ORTHO
MG/L P
0.005K
0.005K
0.005
0.008K
0.008K
0.008K
O.OOSK
0.005K
O.OOSK
O.OOSK
O.OOSK
O.OOSK
O.OOSK
O.OOSK
00665
PHOS-TOT

MG/L P
O.OOSK
0.010K
0.010K
0.010K
0.010K
0.010K
0.010K
0.010K
0.0 10K
0.010K
0.010K
0.010K
0.010K
0.010
  K  VALUE  KNOWN  TO  BE
  LESS  THAN  INDICATED
  L ACTUAL VALUE 15 KNOrfN TO bt
  GREATER THAN VALUE GIVtN

-------
STORE! RETRIEVAL DATE 76/03/10
                                                                  482201
                                                                 29 47 30.0 099 16 45.0 4
                                                                 W PRONG MEDINA RIVER
                                                                 48      6ANDERA CO MAP
                                                                 T/MEDINA LAKE
                                                                 2NDRY RD 8RDG 0.2 MI S JCT 2NDRY RD 1336
                                                                 11EPALES             2111204
                                                                  0000 FEET  DEPTH  CLASS 00
DATE
FROM
TO
74/09/07
74/10/06
74/11/07
74/12/07
75/01/07
75/02/07
75/03/07
75/04/08
75/04/22
75/05/09
75/05/21
75/06/08
75/07/14
75/08/02
00630 00625
TIME DEPTH N02&N03 TOT KJEL
OF N-TOTAL N
DAY FEET
13
10
11
14
12
13
13
12
11
10
10
13
12
11
30
55
29
10
30
06
07
32
25
55
55
00
15
35
MG/L
0.390
0.416
0.416
0.680
0.660
0.760
0.735
0.450
0.400
0.360
0.410
0.590
0.250
0.300
MG/L
0.100
0.100K
0.900
0.300
0.200
0.100
0.1SO
0.5SO
0.400
0.375
0.400
0.200
0.150
0.400
00610 00671 00665
NH3-N PHOS-DIS PHOS-TOT
TOTAL ORTHO
MG/L
0.020
0.020
0.030
0.016
0.016
0.008K.
0.025
0.055
0.027
0.020
0.030
0.010
0.015
0.015
MG/L P
O.OOSK
O.OOSK
0.010
0.008K
0.005
O.OOSK
O.OOSK
O.OOSK
O.OOSK
O.OOSK
O.OOSK
O.OOSK
O.OOSK
O.OOSK
MG/L P
O.OOSK
0.0 10K
0.010
0.010K
0.010K
0.010K
0.010
0.030
0.020
0.010K
0.015
0.010K
0.020
0.010K
  K  VALUE  KNOWN  TO  BE
  LESS  THAN INDICATED

-------