U.S. ENVIRONMENTAL PROTECTION AGENCY
               NATIONAL EUTROPHICATION SURVEY
                        WORKING PAPER SERIES
                                              REPORT
                                               ON
                                           LAKE mCBRIDE
                                           JOHNSON COUNTY
                                               IOWA
                                           EPA REGION VII
                                        WORKING PAPER No, 500
     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 mCBRIDE
                              JOHNSON CQUNIY
                                   IOWA
                              ERft REGION VII
                          WORKING PAPER No, 500
      WITH THE COOPERATION OF THE
IOWA DEPARTMENT OF  ENVIRONMENTAL QUALITY
                AND THE
          IOWA NATIONAL GUARD
              AUGUST,  1976

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                                   CONTENTS
                                                               Page
  Foreword                                                      ii
  List of Iowa 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 Reviewed                                      14
 VI.   Appendices                                               15

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

OBJECTIVES

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

ANALYTIC APPROACH

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

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

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

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

LAKE ANALYSIS

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

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                                 m
    Beyond the single lake analysis, broader based correlations
between nutrient concentrations (and loading) and trophic condi-
tion are being made to advance the rationale and data base for
refinement of nutrient water quality criteria for the Nation's
freshwater lakes.  Likewise, multivariate evaluations for the
relationships between land use, nutrient export, and trophic
condition, by lake class or use, are being developed to assist
in the formulation of planning guidelines and policies by EPA
and to augment plans implementation by the states.

ACKNOWLEDGMENT

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

    The staff of the Water Quality Division of the Department of
Environmental Quality provided invaluable lake documentation and
counsel during the Survey, reviewed the preliminary reports, and
provided critiques most useful in the preparation of this Working
Paper series.

    Major General Joseph G.  May, the Adjutant General of Iowa,
and Project Officer Colonel  Cleadeth P.  Woods, who directed the
volunteer efforts of the Iowa National Guardsmen, are also grate-
fully acknowledged for their assistance to the Survey.

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                                    IV
LAKE NAME

Ahquabi
Big Creek Reservoir
Black Hawk
Clear
Darl ing
Lost Island
MacBride
Prairie Rose
Rathbun Reservoir
Red Rock Reservoir
Rock Creek
Silver
Spirit
Viking
West Okoboji
NATIONAL EUTROPHICATION  SURVEY

         STUDY LAKES

        STATE OF IOWA

                            COUNTY
                            Warren
                            Polk
                            Sac
                            Cerro Gordo
                            Washington
                            Clay, Palo Alto
                            Johnson
                            Shelby
                            Appanoose, Wayne
                            Marion
                            Jasper
                            Worth
                            Dickinson
                            Montgomery
                            Dickinson

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91'34'
91' 30'
                                          91'26
               LAKE MACBRIDE

          <8> Tributary Sampling  Site
          X Lake Sampling Site
          ^f Sewage Treatment  Facility
         J^3 Drainage Area Boundary
                 1     ?    ?     f     ?Km.
                                      3Mi.
                        Scale
                                                                                                  41'50—
                                                                                Iowa
                                                                            Map Location
                                                                                                  4148—

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                              LAKE MACBRIDE
                             STORE! NO. 1907

I.  CONCLUSIONS
    A.  Trophic Condition:
            Survey data indicate that Lake MacBride is eutrophic.   It
        ranked tenth in overall trophic quality when the 15 Iowa lakes
        and reservoirs sampled in 1974 were compared using a combination
        of six lake parameters*.  Five of the water bodies had less median
        total phosphorus, four had less and two had the same median ortho-
        phosphorus, 13 had less median inorganic nitrogen, seven had less
        mean chlorophyll  a_, and four had greater mean Secchi disc  trans-
        parency.  Marked depression of dissolved oxygen with depth occurred
        at sampling station 1 in July and September and at station 2 in
        July.
            Survey limnologists noted areas of high turbidity in the
        south arm of the lake and observed beds of macrophytes in  the
        vicinity of station 1.  An algal  bloom was in progress through-
        out the lake in September.
    B.  Rate-Limiting Nutrient:
            Due to significant changes in nutrient levels in the samples,
        the algal assay results are not representative of conditions in
        the lake at the times the samples were collected (04/18/74 and
        09/24/74).
            The lake data indicate phosphorus limitation in April  and
        September.
* See Appendix A.

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                                     2
    C.  Nutrient Controllability:
            1.  Point sources—The only known point source of phos-
        phorus to Lake MacBride is the Solon wastewater treatment plant
        which contributed nearly 42% of the total load reaching the
        reservoir during the sampling year.  Most of the sewage from
        the MacBride State Park facilities is transported out of the
        drainage basin for treatment and disposal with the remainder
        being treated in septic tanks situated well away from the lake*.
            During the sampling year, the lake received a total
        phosphorus loading over one and a half times that proposed
        by Vollenweider (Vollenweider and Dillon, 1974) as a eutrophic
        loading (see page 13).  It is calculated that 90% phosphorus
        removal at the Solon wastewater treatment plant would reduce
        the total phosphorus loading to 0.42 g/m2/year.  This loading
        would still exceed Vollenweider's eutrophic loading, and it is
        questionable whether the reduction would result in a significant
        improvement in the trophic condition of the lake.
            2.  Non-point sources--It is estimated that non-point sources
        contributed about 52% of the total phosphorus load to Lake
        MacBride during the sampling year.  Mill Creek, the major
        tributary, contributed about 16% of the total phosphorus load.
            Reportedly, many ducks utilize Lake MacBride during spring and
        fall migrations (Anonymous, 1974).  However, waterfowl counts are
* Kenyon, 1976.

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                             3
not made routinely at the lake (Harrison,  1976), and the sig-
nificance of the nutrient contributions of migrating ducks can-
not be assessed.

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                                      4
II.   LAKE AND DRAINAGE BASIN CHARACTERISTICS1"
     A.  Lake Morphemetry  :
         1.  Surface area:   3.84 kilometers2.
         2.  Mean depth:  7.3 meters.
         3.  Maximum depth:   14.2 meters.
         4.  Volume:  28.032 x 106 m3.
         5.  Mean hydraulic  retention  time:   2.2 years.
     B.  Tributary and Outlet:
         (See Appendix C for flow data)
         1.  Tributaries -
                                               Drainage       Mean flow
             Name                              area  (km2)*    (m3/s_ec)*
             Mill Creek (B-l)                     21.5           0.13
             Minor tributaries &
              immediate drainage -                44.6           0.28
                            Totals                66.1           0.41
         2.  Outlet -
             MacBride Dam spillway                69.9**         0.41
     C.  Precipitation***:
         1.  Year of sampling:  74.5 centimeters.
         2.  Mean annual:  85.3 centimeters.
 t Table of metric conversions—Appendix B.
 tt Harrison, 1975.
 * For limits of accuracy, see Working Paper No.  175,  "...Survey  Methods,
   1973-1976".
 ** Includes area of lake.
 *** See Working Paper No. 175.

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                                       5
III.   LAKE WATER QUALITY SUMMARY
      Lake MacBride was sampled three times  during the open-water  season
  of 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 three stations on the  lake (see map,  page  v).
  During each visit, a single depth-integrated (4.6 m or near  bottom
  to surface) sample was composited  from the stations for phytoplankton
  identification and enumeration;  and during the first and  last  visits,
  18.9-liter depth-integrated samples were composited for algal  assays.
  Also each time, a depth-integrated sample  was collected from each
  of the stations for chlorophyll  ^analysis.  The maximum depths  sam-
  pled were 12.5 meters at station 1, 4.0 meters at station 2, and 3.4
  meters at station 3.
      The sampling results are presented in  full in Appendix D and are
  summarized in the following table  (the July nutrient samples were
  not preserved properly and were  not analyzed).

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PARAMETER

TEMP (C)

DISS OXY (MG/L)

CNDCTVY (MCROMOI

PH (STAND UNITS)

TOT ALK (MG/L)

TOT P (MG/L)

ORTHO P (MG/L)

N02*N03 (MG/L)

AMMONIA (MG/L)

KJEL N  (MG/L)

INORG N (MG/L)

TOTAL N (MG/L)

CHLRPYL A (UG/L)

SECCHI  (METERS)
                             A. SUMMARY OF PHYSICAL AND


                             1ST SAMPLING ( 4/18/74)

                                   3 SITES
RANGE
7.8
8.0
233.
7.7
122.
0.029
0.006
1.510
0.060
0.900
2.030
2.580
7.1
0.6
- 12.0
- 10.6
- 293.
8.5
- 148.
- 0.106
- 0.036
- 3.500
- 0.520
- 1.100
- 3.930
- 4.600
- 14.7
1.7
MEAN
10.2
9.3
258.
8.1
130.
0.061
0.012
2.235
0.293
1.000
2.528
3.235
10.7
1.0
MEDIAN
10.2
9.6
252.
8.1
125.
0.058
0.009
2.100
0.290
1.000
2.390
3.095
10.4
0.8
CHEMICAL CHARACTERISTICS FOR LAKE MACBRIDE
 STORET COOE 1907

           2ND SAMPLING ( 7/ 3/74)

                 3 SITES

         RANGE        MEAN   MEDIAN

     11.6  -  25.5    21.5    23.5

      0.6  -   8.2     5.3     7.2

     173.  -  365.    298.    315.

      7.3  -   8.9     8.0     8.1
   »«««»«  _»««**««**»*»««*>•*«»««

   «*«***  .»*>•*••»«««««*««»<•*««

   «*>«•«  .«*»»*««*<>»*«***««««*«»

   «<«*»«  _o««»»«»*«e»«*««»«*««o«

      4.7  -  11.2     8.9    10.9

      0.9  -   1.8     1.3     1.2
3RD SAMPLING ( 9/24/74)

      3 SITES
RANGE
12.0
0.0
113.
6.8
114.
0.021
0.006
0.040
0.030
0.700
0.470
1.120
13.7
0.5
- 17.7
- 11.6
- 259.
8.6
- 173.
- 0.347
- 0.016
- 0.850
- 4.160
- 4.600
- 4.200
- 4.640
- 46.4
1.3
MEAN
16.3
6.4
233.
7.8
133.
0.090
0.011
0.555
0.711
1.475
1.266
2.030
31.5
0.8
MEDIAN
16.8
7.6
245.
8.0
127.
0.063
0.010
0.625
0.160
1.100
0.955
1.850
34.5
0.7

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B.  Biological characteristics:

    1.   Phytoplankton -
        Sampli ng
        Date

        04/18/74
        07/03/74
        09/24/74
    2.   Chlorophyll  a_ -

        Sampling
        Date

        04/18/74
        07/03/74
       09/24/74
Dominant
Genera
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
Centric diatoms
Flagellates
Cryptomonas sj).
Aphanizomenon sp.
Stephanodiscus sj>,
Other genera
Total
Melosira sp.
Oocystis sp.
Flagellates
Cryptomonas sp.
Lepocinclis sjj.
Other genera
Total
Melosira sp.
Flagellates
Pennate diatoms
Cryptomonas sp.
Synedra sp.
Other genera
                                          Total
Station
Number

  1
  2
  3

  1
  2
  3

  1
  2
  3
                           Algal Units
                           per ml	

                             8,889
                             3,081
                               652
                               593
                               474
                               118
                            13,807

                             4,275
                               792
                               317
                               198
                               119
                               315

                             6,016

                             5,076
                             1,232
                               859
                               672
                               635
                             1,268

                             9,742
Chlorophyll  a
(yg/D

     7.1
    14.7
    10.4

    11.2
     4.7
    10.9
    13,
    34.
                                                            46.4

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                                 8
C.  Limiting Nutrient Study:
        Significant changes in nutrient levels occurred in the assay
    samples prior to the beginning of the assays,  and the results
    are not indicative of conditions in the lake at the times  the
    samples were taken (04/18/74 and 09/24/74).
        The lake data indicate phosphorus limitation in April  and
    September (the mean inorganic nitrogen/orthophosphorus ratios
    were 211/1 and 115/1, respectively).

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IV.   NUTRIENT LOADINGS
     (See Appendix E for data)
     For the determination of nutrient loadings,  the  Iowa  National
 Guard collected monthly near-surface  grab samples  from  each of the
 tributary sites indicated on the map  (page v), except for the high
 runoff months of April, May, and June when two samples  were collected.
 Sampling was begun in August,  1974, and  was completed in  July, 1975.
     Through an interagency agreement,  stream flow  estimates for the
 year of sampling and a "normalized" or average year  were  provided by
 the Iowa District Office of the U.S.  Geological  Survey  for the
 tributary sites nearest the lake.
     In this report, nutrient loads for the lake  outlet  were calculated
 using mean concentrations and  the mean flow at station  A-l.  Nutrient
 loads for Mill  Creek were calculated  using the mean  concentrations at
 sampling station B-2 and the mean flow at station  B-l (nutrient concen-
 trations at station B-l were not used  because of incomplete mixing of
 the Solon wastewater treatment plant  effluent in the creek at the sam-
 pling point; however,  B-l  data are included in Appendix E).  Nutrient
 loads shown for Mill  Creek do  not include loads  contributed by the
 wastewater treatment plant.
     Nutrient loads for unsampled "minor  tributaries  and immediate drain-
 age" ("II" of U.S.G.S.) were estimated using the nutrient loads in Mill
 Creek,  in kg/km2/year,  and multiplying by the II area in  km2.

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                                     10
    The operator of the Solon wastewater treatment plant provided
monthly effluent samples but could not provide corresponding flow
data, and nutrient loads were estimated at 1.134 kg P and 3.401  kg
N/capita/year.  Results of analyses of the Solon samples are included
in Appendix E.
    A.  Waste Sources:
        1.  Known municipal* -
                        Pop.                  Mean Flow      Receiving
        Name            Served    Treatment   (m3/d)         Water
        Solon           950       trickling     359.6**      Mill Creek
                                   filter
        2.  Known industrial - None
* Treatment plant questionnaire.
** Estimated at 0.3785 m3/capita/day.

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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) -
                Mill Creek                      465           18.0
            b.  Minor tributaries & immediate
                 drainage (non-point load) -    980           37.9
            c.  Known municipal STP's -
                Solon                         1,075           41.6
            d.  Septic tanks - None
            e.  Known industrial - None
            f.  Direct precipitation* -           65            2.5
                        Total                  2,585          100.0
        2.  Outputs -
            Lake outlet - MacBride Dam          725
                           spillway
        3.  Net annual P accumulation -  1,860 kg.
* See Working Paper No. 175.

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                                    12
    C.  Annual Total Nitrogen Loading - Average Year:
        1.  Inputs -
                                              kg N/          % of
            Source                            yjr	          total
            a.  Tributaries (non-point load) -
                Mill Creek                    18,705          28.8
            b.  Minor tributaries & immediate
                 drainage (non-point load) -  38,800          59.8
            c.  Known municipal STP's -
                Solon                          3,230           5.0
            d.  Septic tanks - None
            e.  Known industrial - None
            f.  Direct precipitation* -        4,145           6.4
                        Total                 64,880         100.0
        2.  Outputs -
            Lake outlet - MacBride Dam        28,590
                           spillway
        3.  Net annual N accumulation - 36,290 kg.
    D.  Mean Annual Non-point Nutrient Export by Subdrainage Area:
        Tributary                             kg P/km2/yr    kg N/km2/yr
        Mill Creek                                22             870
* See Working Paper No. 175.

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                                13
E.  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             0.67       0.48        16.9       9.5
    Vollenweider phosphorus loadings
     (g/m2/yr)  based on mean depth and mean
     hydraulic  retention time of Lake MacBride:
        "Dangerous"  (eutrophic loading)               0.36
        "Permissible"  (oligotrophic loading)          0.18

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                                14

LITERATURE REVIEWED

Anonymous, 1974.  Lake MacBride State Park brochure.  IA Cons.
    Comm., Des Moines.

Harrison, Harry M., 1975.  Personal communication (lake morphemetry).
    IA Cons. Comm., Des Moines.

                  , 1976.  Personal communication (numbers of waterfowl
    at Lake MacBride).  IA Cons. Comm., Des Moines.

Kenyon, Lawrence (Park Ranger), 1976.  Personal communication (State
    Park sewage disposal system).  MacBride State Park, Solon.

Vollenweider, R. A., and P. J. Dillon, 1974.  The application of
    the phosphorus loading concept to eutrophication research.
    Natl. Res. Council of Canada Pub!. No. 13690, Canada Centre
    for Inland Waters, Burlington, Ontario.

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VI.  APPENDICES
                                  APPENDIX A
                                 LAKE RANKINGS

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LAKE DATA TO BE USED IN RANMNGS

LAKE
CODE  LAKE NAME

1901  LAKE ACQUABI

1903  8IG CREEK RESERVOIR

1903  BLACK HAWK LAKE

1904  CLEAR LAKE

1905  LAKE DARLING

1906  LOST ISLAND LAKE

1907  LAKE MACBRIDE

1908  PRAIRIE ROSE LAKE

1909  RATHBUN RESERVOIR

1910  RED ROCK LAKE

1911  ROCK CREEK LAKE

1912  SILVER LAKE

1913  SPIRIT LAKE

1914  VIKING LAKE

1915  WEST LAKE OKOBOJI
MEDIAN
TOTAL P
0.06?
0.046
0.185
0.059
0.077
0.146
0.061
0.056
0.071
0.180
0.065
0.193
0.041
0.075
0.046
MEDIAN
INO«G N
0.335
6.465
0.130
0.070
1.475
0.065
2.035
0.210
1.170
1.880
1.400
0.565
0.090
0.130
0.060
500-
MEAN SEC
469.333
438.500
488.167
465.125
482.500
421.167
458.444
463.667
475.889
473.400
480.500
482.667
422.667
459.000
380.444
MEAN
CHLOrtA
8.600
16.867
49.740
17.400
13.817
36.100
17.067
17.350
12.039
14.730
18.367
95.300
12.622
26.033
7.722
15-
MIN 00
8.200
14.800
15.000
8.600
9.200
8.400
15.000
8.600
14.000
14.000
8.400
10.000
9.000
14.200
15.000
MEDIAN
OISS OKTHO P
0.009
0.011
0.020
0.010
'0.012
0.021
0.010
0.010
o.ooa
0.104
0.007
0.034
0.007
0.017
0.017

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PERCENT OF LAKES WITH HIGHER VALUES (NUMBER OF LAKES WITH HIGHER VALUES)
LAKE
CODE  LAKE NAME
1901  LAKE ACOUA6I
1902  BIG CREEK RESERVOIR
1903  BLACK HAWK LAKE
1904  CLEAR LAKE
1905  LAKE OASLING
1906  LOST ISLAND LAKE
1907  LAKE MACBRIDE
1908  PRAIRIE ROSE LAKE
1909  RATHBUN RESERVOIR
1910  RED ROCK LAKE
1911  ROCK CREEK LAKE
1912  SILVER LAKE
1913  SPIRIT LAKE
191
10)
8)
12)
0)
10)
5)
5)
12)
7)
9)
4)
0)
MEDIAN
DISS ORTHO P
79 (
50 (
21 (
64 (
43 (
14 (
64 (
64 (
86 (
0 (
96 (
7 (
96 (
32 (
32 (
11)
7)
3)
8)
6)
2)
8)
8)
12)
0)
13)
1)
13)
4)
4)
INDEX
NO
422
296
110
382
235
324
263
375
319
167
314
107
504
250
428

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LAKES RANKED BY INDEX NOS.




RANK  LAKE CODE  LAKE NAME               INDEX NO






   1  1913       SPIRIT LAKE                504




   2  1915       WEST LAKE OKOBOJI          428



   3  1901       LAKE ACOUA8I               432



   4  1904       CLEAR LAKE                 382




   5  1908       PRAIRIE ROSE LAKE          375




   6  1906       LOST ISLAND LAKE           324




   7  1909       RATHBUN RESERVOIR          319



   8  1911       ROCK CREEK LAKE            314



   9  1902       BIG CREEK RESERVOIR        296



  10  1907       LAKE MACBRJDE              263




  11  1914       VIKING LAKE                250



  12  1905       LAKE DARLING               235



  13  1910       RED ROCK LAKE              167




  14  1903       BLACK HAWK LAKE            110



  15  1912       SILVER LAKE                107

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    APPENDIX B
CONVERSION FACTORS

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                CONVERSION FACTORS

Hectares x 2.471 = acres
Kilometers x 0.6214 = miles
Meters x 3.281 = feet
                         -4
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

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    APPENDIX C
TRIBUTARY FLOW DATA

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                                   TRIBUTARY FLOW INFORMATION FOR IOWA
                                                                                          12/23/75
LAKE CODE 1907
                   MACBRIDE
          SUB-DRAINAGE
TRIBUTARY  AREAIS8 KM)
1907A1
1907B1
190722
69.9
21.5
48.4
OF LAKE (SO KM) 69.
JAN
0.31
0.09
0.21
FE8
0.73
0.23
0.51
MAR
0.89
0.27
0.62
.9

APR
0.
0.
0.
57
17
39

MAY
0.63
0.19
0.44



NORMALI2ED FLOWS (CMS)
JUN JUL AUG
0.59
0.18
0.41
0.36
0.11
0.25
0.18
0.06
0.13

SEP
0.17
0.05
0.12

OCT NOV
0.13 0.23
0.04 0.07
0.09 0.16

DEC MEAN
0.13 0.41
0.04 0.13
0.09 0.28
SUMMARY
OTAL
IUM OF
DRAINAGE AREA OF LAKE =
SUB-DRAINAGE AREAS =
69.9
70.0


TOTAL FLOW
TOTAL FLOW
IN =
OUT *
4.92
4.92

     MEAN MONTHLY FLOWS AND DAILY FLOWS(CMS)

TRIBUTARY   MONTH   YEAR    MEAN FLOW  DAY

1907A1
190781
19072Z
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
3
4
5
6
7
74
74
74
74
74
75
75
75
75
75
75
75
74
74
74
74
74
75
75
75
75
75
75
75
74
74
74
74
74
75
75
75
75
75
75
75
0.13
0.14
0.09
0.12
0.57
0.45
0.27
0.68
0.65
0.27
0.15
0.03
0.04
0.05
0.03
0.04
0.20
0.14
0.08
0.21
0.20
0.08
0.05
0.01
0.10
0.11
0.07
0.10
0.42
0.31
0.18
0.45
0.45
0.19
0.11
0.02
18
8
20
19
19
18
9
15
7
5
3
6
18
8
20
19
19
18
9
15
7
5
3
6












                                     FLOW  DAY
0.10
0.15
0.08
0.14
1.08
0.28
0.17
1.84
0.82
0.31
0.20
0.06
0.03
0.05
0.03
0.05
0.37
0.09
0.05
0.57
0.25
0.09
0.07
0.02








21
19
19









21
19
19

                                                       FLOW  DAY
                                                                         FLOW
                                                                     0.45
                                                                     0.23
                                                                     0.15
                                                                     0.14
                                                                     0.07
                                                                     0.05

-------
        APPENDIX D





PHYSICAL and CHEMICAL DATA

-------
STORE! RETRIEVAL DATE 75/13/33
                                                                  190701
                                                                 41 47 35.0 091 34 23.0
                                                                 LAKE MACBR10E
                                                                 19103   IOWA
                                                                 HEP ALES
                                                                 3
                                                        3111202
                                                       0045 FEET
                                                                                                DEPTH

DATE
FROM
TO
74/04/18



74/07/03




74/09/24






TIME
OF
DAY
10 10
10 10
10 10
10 10
10 40
10 40
10 40
10 40
10 40
11 00
11 00
11 00
11 00
11 00
11 00

DEPTH

FEET
0000
0005
0015
0040
0000
0005
0015
0025
0040
0000
0005
0015
0025
0030
0041
00010
WATER
TEMP
CENT
9.4
9.4
8.8
7.8
23.5
23.1
19.0
14.7
11.6
17.7
17.6
17.6
17.0
13.9
12.0
                                00300     00077
                                 DO      TRANSP   C
                                         SECCHI   FIELD
                                M6/L     INCHES   M
                                  10.0
                                   9.6
                                   8.8
                                   7.8
                                   5.8
                                   2.2
                                   0.6
                                   0.8
                                   6.2
                                   6.0
                                   6.0
                                   0.6
                                   0.0
                                   0.0
                                              66
                72
                52
194
:TVY
i
IMHO
239
240
237
233
304
299
273
233
173
243
113
235
245
223
223
00400
PH

SU
8.35
8.10
8.00
7.90
8.30
8.10
7.50
7.60
7.30
7.51
7.57
7.37
6.95
6.83
6.77
00410
T ALK
CAC03
MG/L
125
124
125
127





117
114
116
132
144
173
00610
NH3-N
TOTAL
MG/L
0.270
0.320
0.360
0.520





0.260
0.250
0.360
0.910
2.320
4.160
00625
TOT KJEL
N
MG/L
1.000
1.000
0.900
1.100





1.100
0.800
0.800
1.500
2.600
4.600
00630
N02&N03
N-TOTAL
MG/L
1.830
1.760
1.680
1.510





0.840
0.850
0.820
0.520
0.060
0.040
00671
PHOS-OIS
ORTHO
MG/L P
0.008
6.007
0.006
0.007





0.009
0.010
0.009
0.012
0.016
0.016
                      00665
  DATE   TIME DEPTH PHOS-TOT
  FROM    OF
   TO    DAY  FEET   MG/L P

74/04/18 10 10 0000    0.042
         10 10 0005    0.036
         10 10 0015    0.030
         10 10 0040    0.029
74/07/03 10 40 0000
         10 40 0012
74/09/24 11 00 0000    0.021
         11 00 0001
         11 00 0005    0.034
         11 00 0009
         11 00 0015    0.027
         11 00 0025    0.054
         11 00 0030    0.071
         11 00 0041    0.347
  32217     00031
CHLRPHYL  INCDT LT
   A      REMNING
  UG/L    PERCENT

     7.1
    11.2

    13.7
 1.0

50.0

 1.0

-------
STORET RETRIEVAL DATE 75/13/23
                                                                  190702
                                                                 41 47 36.0 091 32 41.0
                                                                 LAKE MACBRIOE
                                                                 19103   IOWA
DATE
FROM
TO
74/04/18


74/07/03


74/09/24


TIME DEPTH
OF

DAY FEET
10 35
10 35
10 35
11 00
11 00
11 00
11 40
11 40
11 40
0000
0005
0013
0000
0005
0010
0000
0005
0011
WATER
TEMP
CENT
12oO
11 o5
9ol
25oO
24.3
19.3
16.6
16.5
16.4
                                00300     00077
                                 DO      TRANSP   O
                                         SECCHI   FIELD
                                MG/L     INCHES   M]
                                   8.6
                                   708
                                   702
                                   Io6
                                   9.6
                                   9*0
                                   9.0
                24


                36


                28
                                                                 11EPALES
                                                                 3
                                                        2111202
                                                       0017 FEET
                                                   DEPTH
i94
:TVV
i
IMHO
293
292
287
365
365
315
259
259
259
0040®
PH

SU
8.50
8.20
7.70
8.20
7.90
7.30
8.39
8.37
8.39
00410
T ALK
CAC03
MG/L
140
ua
148



145
147
143
06610
NH3"N
TOTAL
MG/L
Oo©60
OolSO
Oo430



0.070
0.050
0.050
00625
TOT KJEL
N
MG/L
1.100
®s>9©0
UIOO



0.900
0.800
0.700
00630
N02&N03
N-TOTAL
MG/L
2o700
2o360
3.500



0.420
0.420
0.420
906H
PKOS"=D JS
ORTMO
MG/L P
OoO©9
0.010
0.036



Oo006
0.009
0.010
                      00665
  DATE   TIME DEPTH PHOS-TOT
  FROM    OF
   TO    DAY  FEET   MG/L P

74/04/18 10 35 0000    0.095
         10 35 0005    0.095
         10 35 0013    0.106
74/07/03 11 00 0000
         11 00 0007
74/09/24 11 40 0000    0.062
         11 40 0005    0.055
         11 40 0011    0.065
  32217     00031
CHLRPHYL  INCDT LT
   A      REMNING
  UG/L    PERCENT

    14.7
     4.7

    34.5
1.0

-------
STORE! RETRIEVAL DATE 75/12/23
                                                                  190703
                                                                 41 48 25.0 091 32 40.0
                                                                 LAKE MACBRIOE
                                                                 19103   IOWA

DATE
FROM
TO
74/04/18


74/07/03


74/09/24



TIME DEPTH
OF
DAY FEET
11 00 0000
11 00 0005
11 00 0011
11 20 0000
11 20 0005
11 20 0011
14 00 0000
14 00 0005
14 00 0008
00010
WATER
TEMP
CENT
11.6
11.5
11.0
25.5
25.3
25.0
16.8
16.8
16.8
00300
DO

MG/L

8.2
9.8
8.2
7.8
8.2
11.6
9.6
9.6
                                          00077     00094
                                         TRANSP   CNDUCTVY
                                         SECCHI   FIELD
                                         INCHES   HICROMHO
                                              30


                                              48


                                              18
253
255
250
319
320
317
249
245
247
11EPALCS
3
00400
PH

su
8.20
8.10
8.10
8.90
8.70
8.50
8.63
8.53
8.61

00410
T ALK
CAC03
MG/L
122
122
123



122
119
120
2111202
0015
00610
NH3-N
TOTAL
MG/L
0.240
0.280
0.300



0.030
0.040
0.030
FEET DEPTH
00625
TOT KJEL
N
MG/L
0.900
1.000
1.000



1.100
1.100
1.700
00630
N02&N03
N-TOTAL
MG/L
2.310
2.220
1.980



0.730
0.770
0.770
00671
PHOS-OIS
ORTHO
MG/L P
0.015
0.014
0.013



0.010
0.011
0.012
                      00665     32217     00031
  DATE   TIME DEPTH PHOS-TOT  CHLRPHYL  INCDT LT
  FROM    OF                     A      REMNING
   TO    DAY  FEET   MG/L P     UG/L    PERCENT

74/04/18 11 00 0000    0.062      10.4
         11 00 0005    0.061
         11 00 0011    0.056
74/07/03 11 20 0000               10.9
74/09/24 14 00 0000    0.092      46.4
         14 00 0001                         50.0
         14 00 0004                          1.0
         14 00 0005    0.116
         14 00 0008    0.136

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

-------
STORET RETRIEVAL DATE 76/01/27
                                                                  1907A1
                                                                 41  47  35.0  091  34  30.0
                                                                 LK  MACBRIDE DAM OUTLET
                                                                 19183    7.5 ELY
                                                                 0/LAKE MACBRIDE
                                                                 SPILLWAY  OF LAKE MACBRIDE  DAM
                                                                 11EPALES              2111204
                                                                 4                    0000 FEET   DEPTH

DATE
FROM
TO
74/08/18
74/09/08
74/10/20
7^/11/19
74/12/19
75/01/18
75/02/09
75/03/15
75/04/07
75/04/21
75/05/05
75/05/19
75/06/03
75/06/19
75/07/06

TIME DEPTH
OF
DAY FEET
15 37
11 05
11 30
15 15
14 20
09 40
10 08
12 45
16 00
10 00
14 10
19 55
21 00
20 20
17 30
00630
N02&N03
N-TOTAL
MG/L
1.680
1.040
0.600
0.610
0.660
0.850
0.900
1.100
1.350
1.450
0.330
1.400
1.250
0.930
0.340
00625
TOT KJEL
N
MG/L
0.800
0.800
1.300
0.900
1.500
1.200
1.200
0.900
1.625
2.700
2.000
1.150
0.900
0.700
1.000
00610
NH3-N
TOTAL
MG/L
0.050
0.050
0.420
0.430
0.395
0.296
0.320
0.240
0.380
0.400
0.025
0.085
0.045
0.045
0.145
00671
PHOS-DIS
ORTHO
MG/L P
0.017
0.010
0.005
0.010
0.005K
0.005
0.016
0.005K
0.080
0.040
0.015
0.010
0.015
0.005
0.020
00665
PHOS-TOT

MG/L P
0.035
0.025
0.020
0.030
0.020
0.030
0.016
0.020
0.140
0.170
0.060
0.130
0.050
0.040
0.050
 K VALUE KNOWN TO BE
 LESS THAN INDICATED

-------
STORET RETRIEVAL DATE 76/01/27
                                                                  1907B1
                                                                 41 4B 40.0 091 30 15.0
                                                                 MILL CREEK
                                                                 19      7.5 ELY
                                                                 T/LAKE MACBRIDE
                                                                 ST HNY 382 BROG BELOW SOLON STP
                                                                 11EPALES             2111204
                                                                 4                   0000 FEET  DEPTH

DATE TIME DEPTH
FROM OF
TO DAY FEET
74/08/18 14 55
74/09/08 10 40
74/10/20 11 06
74/11/19 15 01
74/12/19 14 00
75/01/18 09 55
75/03/15 12 19
75/04/07 15 45
75/04/21 09 35
75/05/05 13 45
75/05/19 19 32
75/06/03 20 35
75/06/19 20 05
75/07/06 17 05
00630
N02&N03
N-TOTAL
MG/L
5.200
3.360
3.300
4.000
5.290

3.450
6.900
6.000
5.400
4.200
3.800
3.600
1.600
00625
TOT KJEL
N
MG/L
1.100
2.300
5.300
2.500
1.360
1.300
9.000
1.350
2.700
2.600
3.150
0.800
2.400
2.350
00610
NH3-N
TOTAL
MG/L
0.250
0.975
1.720
0.825
0.097
0.480
1.570
0.300
0.620
0.640
1.150
0.725
0.925
0.950
00671
PHOS-OIS
ORTHO
MG/L P
0.290
0.560
0.975
0.530

0.230
0.975
0.190
0.250
0.360
1.000
0.615
0.840
0.830
00665
PHOS-TOT

MG/L P
0.525
0.710
2.300
0.725
0.205
0.340
2.800
0.360
0.300
0.560
1.150
0.820
1.050
1.080

-------
STORET RETRIEVAL DATE 76/01/37
                                                                  1907B2
                                                                 41  48  40.0  091  30  05.0
                                                                 MILL CREEK
                                                                 19       7.5 ELY
                                                                 T/LAKE MAC8RIOE
                                                                 LGHT DTY RO BRDG ABOVE SOLON  STP
                                                                 11EPALES             2111204
                                                                 4                    0000  FEET  DEPTH
DATE
FROM
TO
74/08/18
74/09/08
74/10/20
74/11/19
74/12/19
75/01/18
75/03/15
75/04/07
75/04/21
75/05/05
75/05/19
75/06/03
75/06/19
75/07/06
00630 00625
TIME DEPTH N02&N03 TOT KJEL
OF N-TOTAL N
DAY FEET
15
10
10
14
13
10
12
15
09
13
19
20
19
16
15
30
55
50
55
05
07
35
25
30
25
30
55
55
MG/L MG/L
5.
2.
2.
4.
5.
0.
3.
7.
6.
0.
4.
4.
3.
1.
300 0.700
640 0.500
640 0.800
000 0.600
240 ]
1.200
025 0.600
670 ]
1.000
200 1.450
300
270
600
000 (
500
100
.100
.150
.600
.650
.000
.050
00610 00671 00665
NH3-N PHOS-DIS PHOS-TOT
TOTAL ORTHO
MG/L
0.060
0.025
0.035
0.060
0.124
0.088
0.190
0.195
0.110
0.035
0.080
0.040
0.110
0.045
MG/L P
0
.090
0.045
0
0
0.
0.
0.
0
0
0
0
0

0
.035
.080
.040
.040
.050
.060
.040
.050
.060
.105

.070
MG/L P
0.160
0.045
0.050
0.090
0.190
0.080
0.115
0.160
0.060
0.050
0.090
0.287
0.100
0.110

-------
STORET RETRIEVAL DATE 76/01/27
DATE
FROM
TO
74/09/27
cpm-
74/09/27
74/10/25
CP(T>-
74/10/25
74/12/27
CP(T>-
74/12/27
75/01/31
CP(T>-
75/01/31
75/02/28
CP(T>-
75/02/28
75/03/31
CP(T>-
75/03/31
75/04/28
CP(T)-
75/04/28
75/05/30
CP < T ) -
75/05/30
75/06/27
75/07/25
CPU)-
75/07/25
75/09/26
CPU)-
75/09/26
75/10/30
CP(T>-
75/10/30
00630
TIME DEPTH N02&N03
OF N-TOTAL
DAY FEET MG/L
08 00
10.100
16 00
06

18
08

16
08

16
08

16
08

16
08

16
08

16

08

16
08

16
08

16
00

00
00

00
00

00
00

00
00

00
00

00
00

00

00

00
00

00
00

00

8.


6.


2.


2.


2.


2.


2.

9.

9.


7.


6.


000


000


880


240


320


200


500

200

000


650


300

00625
TOT KJEL
N
MG/L
17.000

16.


16.


23.


23.


12.


13.


11.

15.

15.


17.


20.


000


000


000


000


000


500


000

000

000


000


000

00610 00671 00665
NH3-N PHOS-OIS PHOS-TOT
TOTAL ORTHO
MG/L MG/L P MG/L P
4.950 4.600 5.100

2.


3.


7.


7.


0.


1.


0.

0.

1.


3.


3.


500


000


750


000


320


550


380

990

350


500


400


6


4


5


3


2


3


3

4

8


7


8


.600


.300


.300


.900


.560


.900


.150

.600

.700


.200


.600


9.400


4.400


8.800


5.400


3.100


4.400


3.400

5.775

9.100


9.000


10.500

                                                                  1907AA          TF1907AA     P0009SO
                                                                 41 34 30.0 093 33 20.0
                                                                 SOLON
                                                                 19183   7.5 SOLON IA
                                                                 T/LAKE MCBRIOE
                                                                 MILL CREEK
                                                                 11EPALES             2141204
                                                                 4                   0000 FEET  DEPTH
                                                                        50051     50053
                                                                        FLOW    CONDUIT
                                                                        RATE    FLOW-MGO
                                                                         0.126
0.128
                                                                         0.082

-------