U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
LAKE AHQUABI
WRREN COUNTY
IOWA
EPA REGION VII
WORKING PAPER No,
CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
•&G.P.O. 699-440
-------
REPORT
ON
LAKEAHQUABI
WRREN COUNTY
IOWA
EPA REGION VII
WORKING PAPER No,
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.
-------
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
Darling
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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9336
Iowa
Map Location
Social Plains /
School
^ •
LAKE AHOUABI
<8> Tributary Sampling Site
X Lake Sampling Site
i
41 17—1
41 16H
?Km.
Scale
iMi.
41 15—I
93'35'
1
9334'
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LAKE AHQUABI
STORE! NO. 1901
I. CONCLUSIONS
A. Trophic Condition:
Survey data indicate that Lake Ahquabi is eutrophic. It ranked
third in overall trophic quality when the 15 Iowa lakes and reser-
voirs sampled in 1974 were compared using a combination of six param-
eters*. Six of the water bodies had less median total phosphorus,
three had less dissolved orthophosphorus, seven had less median inor-
ganic nitrogen, none had less mean chlorophyll a_, and eight had
greater mean Secchi disc transparency. Significant depression of
dissolved oxygen with depth was not detected at any sampling time.
B. Rate-Limiting Nutrient:
The algal assay results indicate that the primary productivity
of Lake Ahquabi was limited by phosphorus at the time the sample
was collected (04/17/74). The lake data indicate phosphorus limi-
tation in September as well.
C. Nutrient Controllability:
1. Point sources—No municipal or industrial point-sources
contributed phosphorus to Lake Ahquabi during the sampling year.
Septic tanks were estimated to have contributed 1.8% of the total
phosphorus load, but a shoreline survey would be necessary to
determine the actual significance of those sources.
The present phosphorus loading of 1.02 g/m2/yr is over 2^ times
See Appendix A.
-------
2
that proposed by Vollenweider (Vollenweider and Dillon, 1974)
as a eutrophic loading (see page 11). If the present phosphorus
loading is not reduced, it is likely that the existing trophic
quality of the lake will deteriorate.
2. Non-point sources—Approximately 98% of the total phos-
phorus input to Lake Ahquabi during the sampling year came from
non-point sources. Unnamed Stream B-l contributed 45.4% of the
total, and the contribution of unsampled tributaries was esti-
mated to have been 51.0%.
The phosphorus export rate of Unnamed Stream B-l was 42 kg/km2/yr
(see page 10). This rate is higher than the rate of a tributary
of Rathbun Lake* (36 kg/km2/yr) but lower than the rates of two
of the tributaries of nearby Red Rock Reservoir** (68 and 78 kg/
km2/yr).
The watershed of Lake Ahquabi is intensively farmed, and agri-
cultural runoff probably contributes a large part of the total
non-point phosphorus load to the lake. In view of the apparent
minimal impact of point sources, it appears that any significant
improvement in the trophic condition of the lake will depend on
control of agricultural phosphorus contributions.
* Working Paper No. 502.
** Working Paper No. 503.
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II. LAKE AND DRAINAGE BASIN CHARACTERISTICS1"
A. Lake Morphometry :
1. Surface area: 0.53 kilometers2.
2. Mean depth: 3.0 meters.
3. Maximum depth: 6.6 meters.
4. Volume: 1.590 x 106 m3.
5. Mean hydraulic retention time: 263 days.
B. Tributary and Outlet:
(See Appendix C for flow data)
1. Tributaries -
Drainage Mean flow
Name area (km2)* (m3/sec)*
Unnamed Stream B-l 5.8 0.03
Minor tributaries &
immediate drainage - 6.5 0.04
Totals 12.3 0.07
2. Outlet -
Unnamed Stream A-l 12.8** 0.07
C. Precipitation***:
1. Year of sampling: 75.8 centimeters.
2. Mean annual: 83.2 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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4
III. LAKE WATER QUALITY SUMMARY
Lake Ahquabi 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 three
depths at one station on the lake (see map, page v). During each visit,
a single depth-integrated (near bottom to surface) sample was collected
for phytoplankton identification and enumeration, and a similar sample
was collected for chlorophyll ^analysis. During the first visit, a
single 18.9-liter depth-integrated sample was taken for algal assays.
The maximum depth sampled was 4.3 meters.
The sampling results are presented in full in Appendix D and are
summarized in the following table (the July nutrient samples were not
properly preserved and were not analyzed).
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A. SUMMARY OF PHYSICAL AND CHEMICAL CHARACTERISTICS TOR LAKE ACQUABI
STORET COOE 1901
PARAMETER
TEMP (C)
OISS OXY (MG/L)
CNDCTVY (MCROMO)
PH (STAND UNITS)
TOT ALK (MG/L)
TOT P (MG/L)
ORTHO P (MG/L)
N02«N03 (MG/L)
AMMONIA 1MG/L)
KJEL N (MG/L)
INORG N (MG/L)
TOTAL N (MG/L)
CHLRPYL A (UG/L>
SECCHI (METEWS)
1ST SAMPLING ( 4/17/74)
1 SITES
2ND SAMPLING ( 7/ 2/74)
1 SITES
3RD SAMPLING ( 9/25/74)
1 SITES
RANGE
10.2 - 12.3
9.6 - 10.0
37. - 145.
104.
Ort TO
.0 Jo
0 .009
0 .470
0.040
0.700
0.510
1 .220
6.8
0.8
~ 104.
~ 0.060
- 0.011
~ 0.520
• 0.060
- 1.100
- 0.580
- 1.620
6.8
0.8
MEAN MEDIAN RANGE MEAN MEDIAN
11.3 11.4 25.5 - 26.3 25.9 25.9
9.8 9.8 7.0 - 7.8 7.5 7.7
86. 77. 271. - 271. 271. 271.
104.
0.048
0.010
0.503
0.053
0.867
0.557
1.370
6.8
0.8
0.800 «•«•«« .«*«»»«««»«*««»*»»**«»«
0.580 «««*•« .»*«»*«««••««»*»««»««•*
6.8 6.7 - 6.7 6.7 6.7
0.8 0.3 - 0.3 0.3 0.3
RANGE '
17.0 - 17.1
6.8 - 7.2
187. - 188.
7.4 "" '
100.
0.064
0.009
0.020
0.120
0.800
0.140
0.820
12.3
1.2
i ••»
• 103.
rt A 1J
- 0.074
- 0.010
— 0.020
- 0.140
- 1.000
- 0.160
- 1.020
- 12.3
1.2
MEAN
17.0
7.1
187.
7.4
101.
0/\tn
.069
0 .009
0.020
0.130
0.867
0.150
0.887
12.3
1.2
MEDIAN
17.0
7.2
187.
7.4
.
On JLQ
. 06tt
0. 009
0.020
0. 130
0.800
0.150
0.820
12.3
1.2
-------
B. Biological characteristics:
1. Phytoplankton -
Sampling
Date
04/17/74
07/02/74
09/25/74
2. Chlorophyll
Sampling
Date
04/17/74
07/02/74
09/25/74
Domi nant
Genera
1 .
2.
3.
4.
5.
1 .
2.
3.
4.
5.
1 .
2.
3.
4.
5.
Synedra sp.
Centric diatoms
Asterionella sp.
Apham'zomenon sp.
Nitzschia sp.
Other genera
Total
Trachelomonas sp.
Anabaena sp.
Centric diatoms
Microcystis sp.
Schroederia sp.
Other genera
Total
Oscillatoria sp.
Melosira sp.
Aphanizomenon sp.
Trachelomonas sp.
Anabaena sp.
Other genera
Total
Algal Units
per ml
475
277
198
158
119
118
Station
Number
1
1
1
1,345
627
575
314
105
105
208
1,934
768
384
154
115
77
153
1,651
Chlorophyll a
(ug/1)
6.8
6.7
12.3
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7
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 0.015 0.540 9.0
0.050 P 0.065 0.540 22.0
0.050P+1.0N 0.065 1.540 37.0
1.0 N 0.015 1.540 10.3
2. Discussion -
The control yield of the assay alga, Selenastrum capri-
cornutum, indicates that the potential primary productivity
of Lake Ahquabi was high at the time the sample was taken
(04/17/74). Also, the addition of orthophosphorus alone
resulted in a significant increase in yield indicating that
the lake was phosphorus limited at that time. Note that the
addition of only nitrogen resulted in a yield not significantly
greater than that of the control.
The lake data substantiate phosphorus limitation. The
mean inorganic nitrogen to orthophosphorus ratios were 56
to 1 and 17 to 1 in April and September, respectively, and
phosphorus limitation would be expected.
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8
IV. NUTRIENT LOADINGS
(See Appendix £ 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). Sampling was begun
in December, 1974, and was completed in June, 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 sampled tributaries were
determined by using a modification of a U.S. Geological Survey computer
program for calculating stream loadings*.
Nutrient loads for unsampled "minor tributaries and immediate
drainage" ("II" of U.S.G.S.) were estimated using the nutrient loads
at station B-l, in kg/km2/year, and multiplying by the II area in km2.
No wastewater treatment plants impacted Lake Ahquabi 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 ^r total
a. Tributaries (non-point load) -
Unnamed Stream B-l 245 45.4
b. Minor tributaries & immediate
drainage (non-point load) - 275 51.0
c. Known municipal STP's - None
d. Septic tanks* - 10 1.8
e. Known industrial - None
f. Direct precipitation** - 10 1.8
Total 540 100.0
2. Outputs -
Lake outlet - Unnamed Stream A-l 180
3. Net annual P accumulation - 360 kg.
* Estimate based on four parks, two campgrounds, and one resort; see Working
Paper No. 175.
** See Working Paper No. 175.
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10
C. Annual Total Nitrogen Loading - Average Year:
1. Inputs -
kg N/ % of
Source yr total
a. Tributaries (non-point load) -
Unnamed Stream B-l 4,900 43.2
b. Minor tributaries & immediate
drainage (non-point load) - 5,495 48.4
c. Known municipal STP's - None
d. Septic tanks* - 390 3.4
e. Known industrial - None
f. Direct precipitation** - 570 5.0
Total 11,355 100.0
2. Outputs -
Lake outlet - Unnamed Stream A-l 4,290
3. Net annual N accumulation - 7,065 kg.
D. Non-point Nutrient Export by Subdrainage Area:
Tributary kg P/km2/yr kg N/km2/yr
Unnamed Stream B-l 42 845
* Estimate based on four parks, two campgrounds and one resort; see Working
Paper No. 175.
** 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 Accumulated' Total Accumulated
grams/m2/yr 1.02 0.68 21.4 13.3
Vollenweider phosphorus loadings
(g/m2/yr) based on mean depth and mean
hydraulic retention time of Lake Ahquabi:
"Dangerous" (eutrophic loading) 0.40
"Permissible" (oligotrophic loading) 0.20
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12
LITERATURE REVIEWED
Anonymous, 1970. Lake Ahquabi brochure (camping and picnic facil-
ities). IA Cons. Comm., Des Moines.
Harrison, Harry M., 1975. Personal communication (lake morphometry).
IA Cons. Comm., Des Moines.
Mayhew, James, 1975. Personal communication (general information on
Lake Ahquabi and watershed). IA Cons. Comm., Chariton.
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 ACQUABI
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 ?
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
MED I AN
INORG N
0.3J5
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
CHLOHA
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 DO
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 OKTnO V>
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 ACOUABI
1902 BIG CREEK RESERVOIR
1903 BLACK HAWK LAKE
1904 CLEAW LAKE
1905 LAKE DARLING
1906 LOST ISLAND LAKE
1907 LAKE M4CBHIDE
1908 PRAIRIE ROSE LAKE
1909 RATHBUN RESERVOIR
1910 RED ROCK LAKE
1911 ROCK CREEK LAKE
1912 SILVER LAKE
1913 SPIRIT LAKE
191<» VIKING LAKE
1915 WEST LAKE OKOdOJI
MEDIAN
TOTAL P
57 <
89 (
7 (
71 (
?9 (
21 (
64 (
79 <
43 (
14 (
50 (
0 (
100 (
36 (
89 (
8)
12)
1)
10)
4)
3)
9)
ID
6)
2)
7)
0)
14)
5)
12)
MEDIAN
INOwG 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 (
79 (
0 (
50 (
14 (
93 (
71 (
57 (
29 (
36 (
21 (
7 (
86 (
64 (
100 (
6)
11)
0)
7)
2)
13)
10)
8)
4)
5)
3)
1)
12)
9)
14)
MEAN
CHLORA
93 (
57 (
7 (
36 (
71 (
It (
50 <
43 (
86 (
64 (
29 (
0 <
79 (
21 (
100 (
13)
8)
1)
5)
10)
2)
7)
6)
12)
9)
4)
0)
11)
3)
14)
15-
HIN DO
100 (
21 (
7 (
75 (
57 (
89 (
7 (
75 (
39 (
39 (
89 (
50 (
64 (
29 (
7 (
14)
3)
0)
10)
8)
12)
0)
10)
5)
5)
12)
7)
9)
4)
0)
MEDIAN
DISS GrtTnO 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
-------
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 422
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 MACBRIDE 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
-------
CONVERSION FACTORS
Hectares x 2.471 = acres
Kilometers x 0.6214 = miles
Meters x 3.281 = feet
Cubic meters x 8.107 x 10 = acre/feet
Square kilometers x 0.3861 = square miles
Cubic meters/sec x 35.315 = cubic feet/sec
Centimeters x 0.3937 = inches
Kilograms x 2.205 = pounds
Kilograms/square kilometer x 5.711 = Ibs/square mile
-------
APPENDIX C
TRIBUTARY FLOW DATA
-------
TRIBUTARY FLO* INFORMATION FOR IOWA
12/33/75
LAKE CODE 1901
AHOUABI LAKE
SUB-DHAINAGE
TRIBUTARY AREA(SO KM)
1901A1
1901B1
1901ZZ
12.8
5.8
7.0
OF LAKE (SO KM) 12,
JAN
0.03
0.02
0.02
FEB
0.07
0.03
0.04
MAR
0.15
0.07
0.08
,8
APR
0.
0.
0.
11
OS
06
MAY
0.13
0.06
0.07
NORMALIZED FLOWS(CMS)
JUN JUL AUG
0.19
0.08
0.10
0.03
0.01
0.02
0.03
0.01
0.01
SEP
0.03
0.01
0.02
OCT NOV
0.02 0.03
0.01 0.01
0.01 0.02
DEC MEAN
0.02 0.07
0.01 0.03
0.01 0.04
SUMMARY
OTAL
;UM OF
DRAINAGE AREA OF LAKE *
SUB-DRAINAGE AREAS =
12.8
12.8
TOTAL FLOW
TOTAL FLOW
IN =
OUT =
0.84
0.84
MEAN MONTHLY FLOWS AND DAILY FLOMS(CMS)
TRIBUTARY MONTH YEAR
1901A1
190IB1
1901ZZ
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
MEAN FLOW DAY
0.0
0.0
0.0
0.01
0.01
0.02
0.02
0.28
0.13
0.06
0.01
0.0
0.0
0.0
0.0
0.0
0.01
0.01
0.01
0.13
0.06
0.03
0.0
0.0
0.0
0.0
0.0
0.01
0.01
0.01
0.01
0.16
0.07
0.03
0.01
0.0
17
7
5
2
15
18
22
16
7
3
8
13
17
7
5
2
15
18
22
16
7
3
8
13
FLOnl DAY
FLOW DAY
FLOW
0.0
0.0
0.0
0.04
0.05
0.02
0.02
0.10
0.08
0.05
0.01
0.0
0.0
0.0
0.0
0.0
0.02
0.01
0.01
0.05
0.04
0.02
0.0
0.0
20
17
21
20
17
21
0.08
0.03
0.03
0.03
0.0
0.0
-------
APPENDIX D
PHYSICAL and CHEMICAL DATA
-------
STORE! RETRIEVAL DATE 75/12/23
190101
41 17 30.0 093 35 32.0
LAKE ACOUABI
19151 IOWA
DATE
FROM
TO
74/04/17
74/07/02
74/09/25
TIME DEPTH
OF
DAY FEET
16 05 0000
16 05 0005
16 05 0013
13 50 0000
13 50 0005
13 50 0010
11 30 0000
11 30 0005
11 30 0014
00010
WATER
TEMP
CENT
12.3
11.4
10.2
26.3
25.9
25.5
17.1
17.0
17.0
00300 00077
DO TRANSP CK
SECCHI FIELD
MG/L INCHES M]
10.0
9.6
7.8
7.7
7.0
7.2
6.6
7.2
32
12
48
11EPALES
3
2111202
0016 FEET
DEPTH
94
TVY
I
MHO
37
77
145
271
271
271
188
187
187
00400
PH
SU
7.90
7.80
7.80
7.40
7.41
7.38
00410
T ALK
CAC03
MG/L
104
104
104
100
103
101
00610
NH3-N
TOTAL
MG/L
0.060
0.040
0.060
0.120
0.130
0.140
00625
TOT KJEL
N
MG/L
1.100
0.800
0.700
1.000
0.800
0.800
00630
N02&N03
N-TOTAL
MG/L
0.520
0.470
0.520
V
0.020K
0.020K
0.020K
00671
PHOS-OIS
ORTHO
MG/L P
0.009
0.011
0.009
0.009
0.010
0.009
DATE
FROM
TO
74/04/17
74/07/02
74/09/25
TIME DEPTH
OF
DAY FEET
16 05 0000
16 05 0005
16 05 0013
13 50 0000
11 30 0000
11 30 0005
11 30 0010
00665
PHOS-TOT
MG/L P
0.046
0.060
0.038
0.074
0.064
32217
CHLRPHYL
A
UG/L
6.8
6.7
12.3
00031
INCDT LT
REMNING
PERCENT
1.0
11 30 0014
0.068
K VALUE KNOWN TO 6E
LESS THAN INDICATED
-------
APPENDIX E
TRIBUTARY DATA
-------
STORE! RETRIEVAL DATE 76/01/27
1901A1
41 17 40.0 093 35 45.0
UNNAMED STREAM
19151 15 INDIANOLA
0/AHQUABI LAKE
BANK SAMP BELO DAM IN LK AHQUABI ST PARK
11EPALES 2111204
4 0000 FEET DEPTH
DATE
FROM
TO
74/12/15
75/03/16
75/04/07
75/04/20
75/05/03
75/05/17
75/06/21
TIME DEPTH
OF
DAY FEET
10 12
09 05
09 15
08 45
10 50
11 05
12 10
00630
N02&N03
N-TOTAL
MG/L
0.064
0.260
0.500
0.550
0.430
0.175
0.030
00625
TOT KJEL
N
MG/L
1.100
1.300
1.700
1.600
1.500
2.200
1.800
00610
NH3-N
TOTAL
MG/L
0.220
0.375
0.235
0.240
0.095
0.300
0.810
00671
PHOS-DIS
ORTHO
MG/L P
0.010
0.007
0.015
0.025
0.010
0.075
0.040
00665
PHOS-TOT
MG/L P
0.040
0.040
0.080
0.130
0*050
0.520
0.120
-------
STORE! RETRIEVAL DATE 76/01/27
190161
41 16 40.0 093 35 30.0
UNNAMED STREAM
19 15 INDIANOLA
T/AHQUABI LAKE
BRD6 ON RO AT S EDGE OF LK AHQUABI ST PK
11EPALES 2111204
4 0000 FEET DEPTH
DATE
FROM
TO
74/12/15
75/04/07
75/04/20
75/05/03
75/05/17
TIME DEPTH
OF
DAY FEET
10 42
10 00
09 05
11 05
11 25
00630
N02&N03
N-TOTAL
MG/L
0.240
1.650
1.400
0.960
9.800
00625
TOT KJEL
N
MG/L
1.200
1.550
1.600
2.100
1.950
00610
NH3-N
TOTAL
MG/L
0.230
0.315
0.240
0.230
0.175
00671
PHOS-DIS
ORTHO
MG/L P
0.005
0.040
0.025
0.025
0.145
00665
PHOS-TOT
MG/L P
0.040
0.140
0.110
0.150
0.370
------- |