U.S. ENVIRONMENTAL PROTECTION AGENCY
               NATIONAL EUTROPHICATION SURVEY
                        WORKING PAPER SERIES
                                             REPORT
                                              ON
                                       BIG CREK RESERVOIR
                                          POLXCOUMY
                                              IOWA
                                          EPA REGION VII
                                       WORKING PAPER No, 495
    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
                           BIG CREK RESERVOIR
                               POLK COUNTY
                                   IOWA
                              EPA REGION VII
                          WORKING PAPER No, 495
      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                     3
III.   Lake Water Quality Summary                                 4
 IV.   Nutrient Loadings                                          8
  V.   Literature Reviewed                                       12
 VI.   Appendices                                                13

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                                 11
                          FOREWORD
    The National Eutrophication Survey was initiated in 1972  in
response to an Administration commitment to investigate the nation-
wide threat of accelerated eutrophication to freshwater lakes and
reservoirs.

OBJECTIVES

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

                               STUDY LAKES

                              STATE OF IOWA

LAKE NAME                                         COUNTY

Ahquabi                                           Warren
Big Creek Reservoir                               Polk
Black Hawk                                        Sac
Clear                                             Cerro Gordo
Darling                                           Washington
Lost Island                                       Clay, Palo Alto
MacBride                                          Johnson
Prairie Rose                                      Shelby
Rathbun Reservoir                                 Appanoose, Wayne
Red Rock Reservoir                                Marion
Rock Creek                                        Jasper
Silver                                            Worth
Spirit                                            Dickinson
Viking                                            Montgomery
West Okoboji                                      Dickinson

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   Iowa
Map Location
  BIG CREEK  RESERVOIR
   ®  Tributary Sampling Site
   X  Lake Sampling Site
 -^~? Drainage Area Boundary
                                                                    4200-
               2     3
             Scale
                           JKm.
Mi.
                                          4150-
                     9350
                    	I
             Spillway  to
             Saylorville
             Reservoir
                    I
93 40

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                           BIG CREEK RESERVOIR
                             STORE! NO. 1902

I.  CONCLUSIONS
    A.  Trophic Condition:
            Survey data indicate that Big Creek Reservoir is  eutrophic.
        It ranked ninth in  overall  trophic quality when the 15 Iowa
        lakes and reservoirs sampled in 1974 were compared using a com-
        bination of six lake parameters*.  One of the water bodies had
        less and one had the same median total phosphorus, seven had less
        median orthophosphorus, all of the others had less median inorganic
        nitrogen, six had less mean chlorophyll a., and three  had greater
        mean Secchi disc transparency.  Depression of dissolved oxygen
        with depth occurred at both stations in July.
            Macrophytes reportedly occur in the shallower upper portion  of
        the reservoir but not in the lower part (Paragamian,  1974).
    B.  Rate-Limiting Nutrient:
            The algal assay results indicate that Big Creek Reservoir
        was limited by phosphorus at the time the sample was  collected
        (09/25/74).  The reservoir data indicate phosphorus limitation
        in April as well.
    C.  Nutrient Controllability:
            1.  Point sources—No known point sources impacted Big
* See Appendix A.

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                             2
Creek Reservoir during the sampling year.  All  sewage from
the surrounding Big Creek State Recreation Area is diverted
from the reservoir (Ossian, 1976).
    The reservoir phosphorus loading of 2.27 g/m2 measured during
the sampling year is almost four times that proposed by Vollen-
weider (Vollenweider and Dillon, 1974) as a eutrophic loading (see
page 11).  Most of this probably resulted from agricultural activi-
ties.
    2.  Non-point sources—All of the phosphorus entering the
reservoir during the sampling year came from non-point sources.
Nearly 45% of the load was contributed by Big Creek, about 37%
by Little Creek, and about 18% by minor tributaries and immedi-
ate drainage.

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II.   LAKE AND DRAINAGE BASIN CHARACTERISTICS1"
     A.   Lake Morphometry  :
         1.   Surface area:   3.44  kilometers2.
         2.   Mean  depth:  6.7 meters.
         3.   Maximum depth:   15.5 meters.
         4.   Volume:  23.048 x 106  m3.
         5.   Mean  hydraulic  retention  time:  269  days.
     B.   Tributary and Outlet:
         (See Appendix C  for flow data)
         1.   Tributaries  -
                                               Drainage       Mean  flow
             Name                               area  (km2)*    (m3/sec)*
             Big Creek                            104.6          0.51
             Little Creek                           53.9          0.26
             Minor tributaries &
              immediate drainage  -                   41.7          0.22
                            Totals                 200.2          0.99
         2.   Outlets -
             Big Creek and Spillway to             203.6**        .0.99
              Saylorville Reservoir,^combined.
     C.   Precipitation***:
         1.   Year  of sampling: 73.0 centimeters.
         2.   Mean  annual:  78.4 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 reservoir.
 *** See Working Paper No.  175.

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                                       4
III.   LAKE WATER QUALITY SUMMARY
      Big Creek Reservoir 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 two stations  on the reservoir (see map,
  page v).   During each visit, a single depth-integrated  (4.6 m to sur-
  face)  sample was composited from the stations for phytoplankton  identi-
  fication 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
  15.2 meters at station 1 and 7.6 meters  at station 2.
      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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                             A. SUMMARY OF PHYSICAL AND
                                                        CHEMICAL CHARACTERISTICS FOR  BIG  CREEK  RESERVOIR
                                                         STORET CODE  1902
PARAMETER

TEMP (C)

DISS OXY (MG/L>

CNOCTVV (MCROMO)

PH (STAND UNITS)

TOT ALK (MG/L)

TOT P (MG/LI

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)
1ST

RANGE
7.8 -
9.8 -
252. -
8.3 -
290. ~
0.059 - 0
0.013 - 0
5.740 ~ 7
0.020 - 0
0.500 - 1
5.860 - 7
6.340 - 8
26.0 -
0.8 -
SAMPLING ( 4/18/74)
2

11.8
16.4
439.
8.5
380.
.105
.049
.590
.170
.100
.610
.090
42.0
1.1
SITES
MEAN
9.8
12.8
352.
8.4
328.
0.075
0.029
6.739
0.071
0.71?
6.810
7.451
34.0
0.9

MEDIAN
9.8
11.4
381.
8.5
328.
0 .075
0.027
6.745
0.060
0.700
6.830
7.480
34.0
0.9
2ND SAMPLING ( 7/ 9/74)
2 SITES
RANGE MEAN MEDIAN
13.2 - 26.7 22.5 24.3
0.2 - 8.0 6.0 7.4
507. - 630. 582. 590.
7.8 - 8.4 8.1 8.3




*«*«** _*****»•*••**•**••>****
*««»*« _««**•«***»*****»*•****
*»**«« -»«»«*»<>•*«»«•»**•«***«
2.7 - 12.8 7.7 7.7
1.2 - 1.2 1.2 1.2
3RD

RANGE
16.9 -
6.6 -
440. -
7.7 -
226. ~
0.024 •• 0
0.006 • 0
5.320 ~ 7
0.070 ~ 0
0.400 - 0
5.430 - 7
5.720 - 7
8.4 -
2.4 -
SAMPLING ( 9/25/74)
2

18.1
9.2
450.
7.9
3CQ
258.
All
.033
A 1 A
• 01O
• 440
.120
.600
.510
.840
9.3
2.6
SITES
MEAN
17.4
7.8
446.
7.8
242.
0.028
OA AT
.007
6.031
0.095
0.450
6.126
6.481
8.8
2.5

MEDIAN
17.4
7.7
448.
7.8
241.
0.029
OA A f
.00 7
5.755
0.095
0.400
5.855
6.235
8.8
2.5

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B.  Biological characteristics:

    1.   Phytoplankton -
        Sampling
        Date

        04/18/74
        07/09/74
        09/25/74
    2.   Chlorophyll  a_ -

        Sampling
        Date

        04/18/74
        07/09/74


        09/25/74
Dominant
Genera
1.
2.
3.
4.
5.
1.
2.
3.
1.
2.
3.
4.
5.
Stephanodiscus sp.
Flagellates
Ankistrodesmus s£.
Chlamydomonas sp.
Gymnodinium sp.
Other genera
Total
Asterionella sp.
Stephanodiscus SJK
Flagellates
Total
Melosira sp.
Fragilaria sp.
Stephanodiscus sp.
Aphanizomenon SJD.
Aphanothece sp.
Other genera
Algal Units
per ml
14,887
665
250
208
166
416
16,592
595
457
46
1 ,098
1,167
257
40
40
40
117
                                          Total
Station
Number

  1
  2

  1
  2

  1
  2
                             1,661
Chlorophyll  a_
(ug/D

    42.0
    26.0

    12.8
     2.7

     8.4
     9.3

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                                 7
C.  Limiting Nutrient Study:
    1.  Autoclaved, filtered, and nutrient spiked -
                         Ortho P          Inorganic N    Maximum yield
        Spike (mg/1)     Cone, (mg/1)     Cone,  (mg/1)    (mg/1-dry wt.)
        Control              0.005             5.070          0.1
        0.050 P             0.055             5.070          3.3
        0.050 P + 1.0 N     0.055             6.070          3.5
        1.0 N               0.005             6.070          0.1
    2.  Discussion -
            The control yield of the assay alga,  Selenastrum capri-
        cornutum, indicates that the potential  primary  productivity
        of Big Creek Reservoir was low at the time the  assay sample
        was collected (09/25/74).  Also, a significant  increase in
        yield with the addition of phosphorus alone indicates that
        the lake was limited by phosphorus at that time.   Note that
        the addition of nitrogen alone resulted  in a yield identical
        to that of the control.
            The reservoir data indicate phosphorus limitation in
        April as well as in September (the mean  inorganic nitrogen
        to orthophosphorus ratios were 235 to 1  and 875 to 1, respec-
        tively).

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                                      8
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 period from May through July when samples were collected
 approximately every two weeks.  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 reservoir.
     In this report, nutrient loads for sampled  streams were  determined
 using a modification of a U.S. Geological Survey computer program
 for calculating stream loadings*.   The combined  outlet loads are
 based on nutrient concentrations measured at the Big Creek outlet (A-l),
 but nutrient data for both outlets are included  in Appendix  E.   Nutrient
 loads shown are those measured minus point-source loads, if  any.
     Nutrient loads for unsampled "minor tributaries and immediate
 drainage" ("ZZ" of U.S.G.S.) were estimated using the nutrient loads
 at station A-2, in kg/km2/year, and multiplying  by the ZZ area in km2.
     No known point sources impacted Big Creek Reservoir during the
 sampling year.
 * See Working Paper No. 175.

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                                     9
    A.  Waste Sources:
        1.  Known municipal - None
        2.  Known industrial - None
    B.  Annual Total Phosphorus Loading - Average Year:
        1.  Inputs -
                                              kg P/          % of
            Source                            y_r	          total
            a.  Tributaries (non-point load) -
                Big Creek                     3,485           44.7
                Little Creek                  2,880           36.9
            b.  Minor tributaries & immediate
                 drainage (non-point load) -  1,375           17.6
            c.  Known municipal STP's - None
            d.  Septic tanks - None
            e.  Known industrial - None
            f.  Direct precipitation* -       	60_            0.8
                        Total                 7,800          100.0
        2.  Outputs -
            Lake outlets - Big Creek and      2,055
                            Spillway
        3.  Net annual P accumulation - 5,745 kg.
* See Working Paper No. 175.

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                                    10
        Annual Total Nitrogen Loading - Average Year:
        1.  Inputs -
                                              kg N/
            Source                            yj;	
            a.  Tributaries (non-point load) -
                Big Creek                     186,220
                Little Creek                  105,050
            b.  Minor tributaries & immediate
                 drainage (non-point load) -   74,225
            c.  Known municipal STP's - None
            d.  Septic tanks - None
            e.  Known industrial - None
            f.  Direct precipitation* -
                        Total
        2.  Outputs -
            Lake outlets - Big Creek and
                            Spillway
  3.715
369,210
201,830
        3.  Net annual N accumulation - 167,380 kg.
        Non-point Nutrient Export by Subdrainage Area:
        Tributary                             kg P/km2/yr
        Big Creek
        Little Creek
    33
    53
               % of
               total
                50.4
                28.5
                20.1
  1.0
100.0
kg N/km2/yr
    1,780
    1,949
* See Working Paper No. 175.

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                                11
E.  Yearly Loads:
        In the following table,  the existing phosphorus loadings
    are compared to those proposed  by Vollenweider (Vollenweider
    and Dillon, 1974).   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    Accumulate?    Total    Accumulated
    grams/m2/yr             2.27       1.67        107.3      48.7
    Vollenweider phosphorus loadings
     (g/m2/yr) based on mean depth  and  mean
     hydraulic retention time of Big Creek Reservoir:
        "Dangerous"  (eutrophic  loading)                0.58
        "Permissible"  (oligotrophic loading)            0.29

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                                    12

V.  LITERATURE REVIEWED

    Ossian, Roger (Recreation Area Officer), 1976.  Personal communication
        (State Recreation Area sewage disposal  system).  Big Creek Reser-
        voir State Recreation Area, Polk City.

    Harrison, Harry M., 1975.  Personal communication (reservoir mor-
        pheme try) .  IA Cons. Comm., Des Moines.

    Paragamian, Vaughn L., 1974.  Man-made lake investigations.  Fed. Aid
        to Fish Rest. Proj. No. F-88-R-1, IA Cons. Comm., Des Moines.

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

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VI.  APPENDICES
                                  APPENDIX A
                                 LAKE RANKINGS

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LAKE DATA TO BE USED IN RANKINGS

LAKE
CODE  LAKE NAME

1901  LAKE ACOUAdI

1902  BIG 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 i3
0.062
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
INORG 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
46V. 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
CHLOKA
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
DISS OKTnO P
0.009
0.011
0.020
0.010
0.012
0.021
0.010
0.010
0.008
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
1903  BIG CREEK RESERVOIR
1903  BLACK HAWK LAKE
1904  CLEAR LAKE
1905  LAKE DARLING
1906  LOST ISLAND LAKE
1907  LAKE M4CBRIDE
1908  PRAIRIE ROSE LAKE
1909  RATHBUN RESERVOIR
1910  RED POCK LAKE
1911  ROCK CREEK LAKE
1912  SILVER LAKE
1913  SPIRIT LAKE
1914  VIKING LAKE
1915  WEST LAKE OKOBOJI
MEDIAN
TOTAL P
57 (
89 (
7 (
71 (
29 (
21 (
64 (
79 <
43 (
14 <
50 (
0 (
100 (
36 (
89 (
8)
12)
1)
10)
4)
3)
9)
11)
6)
2)
7)
0)
14)
5)
12)
MEDIAN
INO*G N
50 (
0 (
68 (
86 (
21 (
93 (
7 (
57 (
36 (
14 (
29 (
43 (
79 (
68 (
100 (
7)
0)
9)
12)
3)
13)
1)
8)
5)
2)
4)
6)
11)
9)
14)
500-
MEAN SEC
43 I
79 (
0 <
50 (
14 (
93 (
71 (
57 (
29 (
36 (
21 <
7 (
66 (
64 (
100 (
6)
11)
0)
7)
2)
13)
10)
8)
4)
5)
3)
1)
12)
9)
14)
MEAN
CHLORA
93 (
57 (
7 <
36 (
71 (
1* (
50 <
43 <
86 (
64 (
2* (
0 (
79 (
21 (
100 (
13)
8)
1)
5)
10)
2)
7)
6)
12)
9)
4)
0)
11)
3)
14)
15-
MIN DO
100 I
21 <
7 (
75 (
57 (
89 (
7 (
75 (
39 (
39 t
89 (
50 (
64 (
29 (
7 (
14)
3)
0)
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 OK080JI          428



   3  1901       LAKE ACOUABI               422



   4  1904       CLEAR LAKE                 382




   5  1908       PRAIRIt 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 HACBRIDE              263




  11  1914       VIKING LAKE                250



  12  1905       LAKE DARLING               235



  13  1910       RED ROCK LAKE              167



  14  1903       BLACK HAWK LAKE            HO



  15  1912       SILVER LAKE                107

-------
    APPENDIX B
CONVERSION FACTORS

-------
                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

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

-------
                                   TRIBUTARY FLOW INFORMATION FUR IOWA

LAKE CODE 1902     BIG CREEK RES.

     TOTAL DRAINAGE AREA OF LAKE(SO KM)     203.6
                                                                             02/05/76
          SUB-DRAINAGE
TRIBUTARY  AREA(SO KM)
                                                   NORMALIZED FLOWS(CMS)
             JAN     FEB     MAR     APR     MAY     JUN     JUL     AUG
                                       SEP
                             OCT
                   NOV
DEC
                                                                                                            MEAN
1902A1
1902A2
1902B1
1902ZZ
203.6
104.6
 53.9
 45.1
0
0
0
0
.31 0.75 1.58 1.38
.16 0.39 0.81 0.71
.08 0.20 0.42 0.37
.07 0.17 0.35 0.31
1.22
0.63
0.32
0.27
1.23
0.63
0.33
0.27
0.88
0.45
0.23
0.18
0.49
0.25
0.13
0.11
1.61
0.83
0.43
0.36
1
0
0
0
.06
.55
.28
.24
0.88
0.45
0.23
0.20
0.43
0.22
0.11
0.10
0.99
0.51
0.26
0.22
SUMMARY
0
iu
TAL DRAINAGE AREA OF LAKE =
M OF SUB-DRAINAGE AREAS =
203.6
203.6




TOTAL FLOW
TOTAL FLOW
IN *
OUT »


11.82
11.84






MOTE *«« Cl NORMALIZED FLOWS INCLUDED IN Al

     MEAN MONTHLY FLOWS AND DAILY FLOWS(CMS)
TRIBUTARY   MONTH   YEAR
1902A1
               MEAN FLOW  DAY
1902A2
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
0.03
0.05
0.04
0.04
0.03
0.03
0.03
0.04
0.06
0.06
0.04
0.03
0.07
0.06
0.05
0.12
0.11
0.10
0.07
0.91
1.22
0.62
2.07
0.42
17
24
24
23
23
27
20

28
10
20
18
17
24
24
23
23
27
20

28
10
20
18
FLOW  DAY

0.03
0.05
0.04
0.04
0.03
0.03
0.03
FLOW  DAY
FLOW
                                      0.06
                                      0.06
                                      0.04
                                      0.03
                                      0.08
                                      0.03
                                      0.02
                                      0.07
                                      0.10
                                      0.07
                                      0.07

                                      2.21
                                      0.59
                                      1.64
                                      0.20
                                                          19
                  0.06   31
                  0.06
                                                          19
0.42
                         31
                  1.08

-------
                                   TRIBUTARY FLOtel INFORMATION FOR IOWA
                                                                                          03/05/76
LAKE CODE 1902
BIG CREEK RESc
     MEAN MONTHLY FLOWS AND DAILY FLOWS(CMS)

TRIBUTARY   MONTH   YEAR    MEAN FLOW  DAY

190281
1902C1
19022Z
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
0.04
Oo03
®o@2
@986
9.®5
0,05
0.®4
Oo48
0.62
0.34
1.08
0.22
0.0
0.0
0.0
0.0
0.0
0.0
0.0
1.73
2.29
1.19
3.57
0.71
0.03
0.03
0.02
0.05
0.05
0.04
0.03
0.40
0.51
0.27
0.91
0.18
17
24
24
23
23
27
20

28
10
20
18
17
24
24
23
23
27
20

28
10
20
18












                                FLOH  DAY

                                0.06
                                0.01
                                OoOl
                                0003
                                0.05
                                0.04
                                0.03
                                1.13
                                0.31
                                0.85
                                0.10
                                0.0
                                0.0
                                0.0
                                0.0
                                0.0
                                0.0
                                0.0

                                4.22
                                1.10
                                2.83
                                0.34
FLOW  DAY
FLOtel
                                                          19
0.23   31
                                                                                       0.54
                                                          19
0.79
                                                                            31
                  2.®!

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

-------
STORET RETRIEVAL DATE 75/13/23
                                                                  190201
                                                                 42  05  24.0  094  02  54.0
                                                                 BIG CREEK RESERVOIR
                                                                 19015    IOWA
11EPALES


DATE
FROM
TO
74/04/18




74/07/09




74/09/25




DATE
FROM
TO
74/04/18




74/07/09
74/09/25






TIME DEPTH
OF
DAY FE£T
15 40 0000
15 40 0005
15 40 0015
15 40 0025
15 40 0050
10 10 0000
10 10 0005
10 10 0015
10 10 0025
10 10 0050
13 35 0000
13 35 0005
13 35 0019
13 35 0038

TIME DEPTH
OF
DAY FEET
15 40 0000
15 40 0005
15 40 0015
15 40 0025
15 40 0050
10 10 0000
13 35 0000
13 35 0002
13 35 0005
13 35 0019
13 35 0038

00010
WATER
TEMP
CENT
11.8
11.1
9.8
8.7
7.8
25.1
24.9
24.3
19.5
13.2
17.6
17.4
17.4
17.3
00665
PHOS-TOT

MG/L P
0.059
0.072
0.065
0.059
0.105

0.029

0.026
0.029
0.033

00300
00

MG/L

16.4
14.2
11.4
9.8
7.8
7.8
7.4
4.8
0.2
8.0
7.4
7.2
7.2
32217
CHLRPHYL
A
UG/L
42.0




12.8
8.4





00077
TRANSP
SECCHI
INCHES
43




48




96



00031
INCDT LT
REMNING
PERCENT







50.0

1.0


00094
CNDUCTVY
FIELD
MICROMHO
252
319
381
406
439
610
600
590
507
560
448
448
448
447















3
00400
PH

SU
8.50
8.40
8.30
8.30
8.40
8.40
8.40
8.30
7.80
7.80
7.74
7.7<»
7.72
7.73
















00410
T ALK
CAC03
MG/L
290
290
325
330
320





232
242
240
226















2111202
0055
00610
NH3-N
TOTAL -
MG/L
0.030
0.050
0.080
0.170
0.030





0.120
0.120
0.120
0.110















FEET
00
TOT 1
N
MG,
0
0
0
0
1





0
0
0
0















                                                                                                DEPTH
                                                                                             0.800
                                                                                             0.700
                                                                                             0.600
                                                                                             0.700
                                                                                               100
                                                                                              600
                                                                                              400
                                                                                            0.500
                                                                                              400
  00630
N02&N03
N-TOTAL
  MG/L

   6.980
   6.590
   7.270
   6.900
   6.260
   5.950
   5.730
   5.690
   5.320
  00671
PHOS-DIS
 ORTHO
 MG/L P

   0.013
   0.020
   0.035
   0.049
   0.014
   0.007
   0.007
   0.010
   0.008

-------
STORE? RETRIEVAL DATE 75/12/33
                                                                  190203
                                                                 42 05 24.0  094 02 54.0
                                                                 BIG CREEK RESERVOIR
                                                                 19015   IOWA
DATE
FROM
TO
74/04/18



74/07/09



74/09/25




DATE
FROM
TO
74/04/18



74/07/09
74/09/25




TIME DEPTH
OF
DAY FEET
16 05 0000
16 05 0005
16 05 0015
16 05 0025
10 45 0000
10 45 0005
10 45 0015
10 45 0025
14 10 0000
14 10 0005
14 10 0017
14 10 0025

TIME DEPTH
OF
DAY FEET
16 05 0000
16 05 0005
16 05 0015
16 05 0025
10 45 0000
14 10 0000
14 10 0003
14 10 0005
14 10 0017
14 10 0025
00010
WATER
TEMP
CENT
11.2
10.3
9.2
8.0
26.7
26.4
23.3
19.5
18.1
17.6
17.1
16.9
00665
PHOS-TOT

MG/L P

0.083
0.078
0.081

0.024

0.029
0.026
0.030
00300
DO

MG/L

15.4
11.4
10.8
8.0
8.0
6.0
3.6
9.2
6.6
8.4
8.6
32217
CHLRPHYL
A
UG/L
26.0



2.7
9.3




00077 00094
TRANSP CNDUCTVY
SECCHI FIELD
INCHES MICROMHO
30 255
310
391
414
48 630
623
586
531
104 450
444
441
440
00031
INCDT LT
REMNING
PERCENT






50.0

1.0

11EPALES 2111202
3 0030 FEET DEPTH
00400 00410 00610 00625 00630 00671
PH T ALK NH3-N TOT KJEL N02&N03 PHOS-DIS
CAC03 TOTAL N
SU MG/L MG/L MG/L
8.50
8.50 340 0.070 0.700
8.50 380 0.120 0.600
8.50 350 0.020 0.500
8.40
8.30
8.10
7.80
7.91 258 0.080 0.500
7.90 248 0.070 0.400
7.90 252 0.070 0.400
7.89 234 0.070 0.400














N-TOTAL ORTHO
MG/L MG/L P

6.580 0.039
5.740 0.045
7.590 0.020


.

5.780 0.006
7.440 0.007
5.650 0.006
6.690 0.009















-------
  APPENDIX E
TRIBUTARY DATA

-------
STORE! RETRIEVAL DATE 76/01/27
                                                                  1902A1
                                                                 41  47  40.0  093 43  00.0
                                                                 BIG CREEK
                                                                 19       7.5 SLATER
                                                                 0/BIG  CREEK RESERVOIR
                                                                 BELO DAM SPLLWAY  1.5 MI  N OF  POLK  CITY
                                                                 11EPALES            2111204
                                                                 4                   0000 FEET  DEPTH

DATE
FROM
TO
74/09/24
74/11/25
74/12/23
75/01/27
75/02/20
75/04/28
75/05/10
75/05/19
75/05/31
75/06/20
75/07/18
75/07/31

TIME DEPTH
OF
DAY FEET
15 40
14 30
11 05
15 25
15 30
11 35
19 40
10 55
17 20
09 50
10 05
10 40
00630
N02&N03
N-TOTAL
MG/L
3.400
4.100
4.600
5.040
5.280
4.600
4.730
4.400
4.300
4.300
4.400
4.000
00625
TOT KJEL
N
MG/L
0.900
0.600
0.600
0.700
0.600
0.700
1.200
1.250
0.500
1.500
1.500
1.600
00610
NH3-N
TOTAL
MG/L
0.010
0.100
0.095
0.144
0.144
0.035
0.140
0.195
0.210
0.360
0.590
0.710
00671
PHOS-DIS
ORTHO
MG/L P
0.025
0.010
0.050
0.040
0.088
0.020
0.035
0.020
0.010
0.045
0.120
0.140
00665
PHOS-TOT

MG/L P
0.070
0.030
0.060
0.050
0.100
0.050
0.050
0.030
0.120
0.110
0.130
0.180

-------
STORET RETRIEVAL DATE 76/02/09
                                                                  1902A2
                                                                 41 50 55.0 093 46 00.0
                                                                 BIG CREEK
                                                                 19153   7.5 GRANGER
                                                                 T/BIG CREEK RESERVOIR
                                                                 LGHT DTY RD BRDG 2.75 MI SE OP MADRID
                                                                 11EPALES             2111204
                                                                 4                   0000 FEET  DEPTH

00630
DATE TIME DEPTH N02&N03
FROM OF
TO DAY FEET
74/08/17 15 05
74/09/24 10 55
74/10/24 12 50
74/11/23 14 30
74/12/23 10 20
75/04/28 11 05
75/05/10 19 15
75/05/19 10 25
75/05/31 16 45
75/06/20 09 25
75/07/18 09 40
75/07/31 10 15
N-TOTAL
MG/L
4.400
0.128
0.024
6.750
6.780
7.200
10.000
9.600
11.500
10.500
11.000
4.900
00625
TOT KJEL
N
MG/L
1.300
0.700
0.700
0.400
0.700
0.550
1.400
1.350
1.600
1.900
0.550
0.750
00610
NH3-N
TOTAL
MG/L
0.115
0.015
0.025
0.035
0.030
0.045
0.065
0.060
0.035
0.035
0.015
0.030
00671
PHOS-DIS
ORTHO
MG/L P
0.120
0.010
0.005
0.035
0.045
0.130
0.060
0.025
0.080
0.108
0.020
0.015
00665
PHOS-TOT

MG/L P
0.260
0.055
0.025
0.060
0.080
0.180
0.210
0.170
0.320
0.500
0.040
0.050
50051 50053
FLOW CONDUIT
RATE FLOW-MOD
INST MGD MONTHLY













-------
STORET RETRIEVAL DATE 76/01/27
                                                                  1902B1
                                                                 41  49  40.0  093 46 20.0
                                                                 LITTLE CREEK
                                                                 19       7.5 GRANGER
                                                                 T/8IG  CREEK RESERVOIR
                                                                 LGHT OTY RD BRUG  4.5 MI  SE  OF  MADRID
                                                                 11EPALES            2111204
                                                                 4                  0000 FEET   DEPTH
DATE
FROM
TO
74/08/17
74/09/24
74/10/24
74/11/23
74/12/23
75/01/27
75/02/20
75/04/28
75/05/10
75/05/19
75/05/31
75/06/20
75/07/18
75/07/31
00630 00625
TIME DEPTH N02&N03 TOT KJEL
OF N-TOTAL N
DAY FEET
14
15
12
14
10
15
15
11
19
10
17
09
09
10
33
15
45
20
45
10
10
20
30
35
05
40
50
20
MG/L
3.800
0.024
0.008
5.680
7.130
6.900
6.300
9.200
11.000
10.500
12.600
10.500
12.000
6.000
MG/L
1.
1.
1.
0.
0.
1.
1.
000
900
000
900
600
300
300
4.500
0.
1.
1.
1.
0.
1.
925
400
600
850
750
100
00610 00671 00665
NH3-N PHOS-DIS PHOS-TOT
TOTAL ORTHO
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
075
025
030
050
060
400
352
103
050
025
050
030
030
065
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
P
055
030
050
210
100
180
184
133
080
030
085
115
055
025
MG/L P
0
0
0
0
0
0
0
1
0
0
0
0
0
0
.155
.210
.115
.290
.150
.230
.230
.50®
.140
.170
.290
.440
.100
.110

-------
STORET RETRIEVAL DATE 76/01/27
                                                                  1902C1
                                                                 41  47 10.0 093 43 15.0
                                                                 BIG CREEK
                                                                 19153   15 SLATER
                                                                 0/BIG CREEK RESERVOIR
                                                                 20  FT BELOW BIG CREEK DAM SPILLWAY
                                                                 11EPALES             2111204
                                                                 4                   0000 FEET  DEPTH

DATE
FROM
TO
74/08/17
74/09/24
74/11/23
74/12/23
75/01/27
75/02/20
75/04/28
75/05/10
75/05/19
75/05/31
75/06/20
75/07/18
75/07/31

TIME DEPTH
OF
DAY FEET
16 00
14 55
14 15
11 20
15 40
15 50
11 50
19 50
11 10
17 30
11 20
10 25
11 00
00630
N02&N03
N-TOTAL
MG/L
6.200
0.439
3.830
4.270
3.800
3.900
4.900
5.400
5.200
5.200
6.900
7.600
4.950
00625
TOT KJEL
N
MG/L
0.800
1.800
0.700
0.500
0.800
0.900
0.750
0.900
1.750
1.100
1.100
0.900
1.300
00610
NH3-N
TOTAL
MG/L
0.060
0.162
0.128
0.070
0.088
0.056
0.025
0.020
0.045
0.060
0.135
0.090
0.250
00671
PHOS-DIS
ORTHO
MG/L P
0.015
0.020
0.010
0.020
0.015
0.024
0.025
0.005
0.010
0.015
0.030
0.005
0.005
00665
PHOS-TOT

MG/L P
0.035
0.120
0.030
0.020
0.030
0.050
0.160
0.020
0.150
0.070
0.115
0.030
0.070

-------