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
-------
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
-------
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.
-------
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.
-------
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.
-------
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
-------
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
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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
------- |