U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
ROCK CREK LAKE
JASPER COUNTY
IOWA
EPA REGION VII
WORKING PAPER No, 504
CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
699-440
-------
REPORT
ON
ROCK CREK LAKE
JASPER COUNTY
IOWA
EPA REGION VII
WORKING PAPER No,
WITH THE COOPERATION OF THE
IOWA DEPARTMENT OF ENVIRONMENTAL QUALITY
AND THE
IOWA NATIONAL GUARD
AUGUST, 1376
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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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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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ROCK CREEK
LAKE
(^Tributary Sampling Site
XLake Sampling Site
3 Drainage Area Boundary
i
Scale
2 Mi.
4150H
92*54
-------
ROCK CREEK LAKE
STORE! NO. 1911
I. CONCLUSIONS
A. Trophic Condition:
Survey data indicate Rock Creek Lake is eutrophic. It
ranked eighth in overall trophic quality when the 15 Iowa
water bodies sampled in 1974 were compared using a com-
bination of six parameters*. Seven of the water bodies
had less median total phosphorus, none of the others had
less but one had the same median dissolved phosphorus, ten
had less median inorganic nitrogen and mean chlorophyll a_,
and 11 had greater mean Secchi disc transparency.
Survey limnologists noted beds of aquatic macrophytes
along the shore near station 1 in July and an algal bloom
at station 1 in September.
B. Rate-Limiting Nutrient:
The algal assay results show that Rock Creek Lake was
phosphorus limited in April and September. The lake data
indicate phosphorus limitation at all sampling stations
and times.
C. Nutrient Controllability:
1. Point sourcesThere were no known point sources
impacting Rock Creek Lake during the sampling year. None-
theless, the present phosphorus loading of 3.12 g/m2/yr is
* See Appendix A.
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2
six times that proposed by Vollenweider (Vollenweider and
Dillon, 1974) as a eutrophic loading (see page 11).
2. Non-point sourcesThe primary source of phosphorus
was Rock Creek which contributed an estimated 64.7% of the
total phosphorus load to the lake during the sampling year.
The minor tributaries and immediate drainage area contributed
an estimated 34.8% of the total load.
The phosphorus export rate of Rock Creek was a high
77 kg/km2 during the sampling year. Since no point sources
impact the stream, land-use practices must be the cause of
the high export rate.
In a study of the Iowa Great Lakes, Bachmann and Jones
(1973) found the variability in the phosphorus loads in
the tributaries was highly correlated with the numbers of
animal units (one animal unit = one beef animal) in the
respective watersheds, and the 1969 Census of Agriculture
(Anonymous, 1973) shows an animal density in the Rock Creek
Lake area similar to that in the Iowa Great Lakes area.
This suggests that a significant reduction in the Rock Creek
phosphorus input may require control of animal wastes.
Reportedly, many ducks utilize the main portion of Rock
Creek Lake during spring and fall migrations (Anonymous, 1972).
However, waterfowl counts are not made routinely (Harrison, 1976),
and the significance of nutrient contributions of migrating ducks
cannot be determined.
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II. LAKE AND DRAINAGE BASIN CHARACTERISTICS1"
A. Lake Morphometry :
1. Surface area: 2.60 kilometers2.
2. Mean depth: 2.7 meters.
3. Maximum depth: 6.7 meters.
4. Volume: 7.020 x 106 m3.
5. Mean hydraulic retention time: 143 days.
B. Tributary and Outlet:
(See Appendix C for flow data)
1. Tributaries -
Drainage Mean flow
Name area (km2)* (m3/sec)*
Rock Creek 67.9 0.36
Minor tributaries &
immediate drainage - 36.7 0.21
Totals 104.6 0.57
2. Outlet -
Rock Creek 107.2** 0.57
C. Precipitation***:
1. Year of sampling: 88.6 centimeters.
2. Mean annual: 87.6 centimeters.
t Table of metric conversionsAppendix 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
Rock Creek Lake 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 two or more depths at two stations on the lake (see map, page
v). During each visit, a single depth-integrated (near bottom to
surface) sample was composited from the stations for phytoplankton
identification and enumeration; and during the March and September
visits, a single 18.9-liter depth-integrated sample was composited
for algal assays. Also each time, a depth-integrated sample was col-
lected from each of the stations for chlorophyll a_ analysis. The
maximum depths sampled were 4.6 meters at station 1 and 1.5 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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PARAMETER
TEMP (C)
OISS OXY (MG/U
CNDCTVY (HCROMO)
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 ( 4/19/74)
2 SITES
RANGE MEAN MEDIAN
11.5 - 12.7 12.0 11.7
10.4 - 13.8 11.9 11.4
83. - 225. 146. 161.
8.6 - 8.7 8.7 8.7
136. - 146. 140. 138.
0.061 - 0.071 0.065 0.06S
0.004 - 0.007 0.005 0.005
2.210 - 2.390 2.314 2.320
0.030 - 0.050 0.038 0.040
0.600 - 1.000 O.U40 0.900
2.250 - 2.420 2.352 2.370
2.980 - 3.320 3.154 3.170
24.4 - 34.9 29.6 29.6
0.5 - 0.6 0.5 0.5
CHEMICAL CHARACTERISTICS FOR ROCK CREEK LAKE
STORET CODE 1911
2ND SAMPLING ( 7/ 3/74)
2 SITES
RANGE
23.6 - 24.8
6.6 - 7.4
368. - 455.
7.8 - 8.0
MEAN MEDIAN
24.1 23.7
6.9 6.8
402. 369.
7.9 7.8
**** _***»**»»***
o _********
****** _
****** -»*«»*»«»****
** .<***»»»****»**
»**«* -»
<>* _»**»****»**»
»» -*******
4.2 - 18.7 11.4 11.4
0.2 - 0.3 0.3 0.3
3RD SAMPLING ( 9/24/74)
2 SITES
RANGE MEAN MEDIAN
15.5 - 16.4 16.0 16.3
7.0 - 8.2 7.7 8.0
265. - 337. 321. 333.
7.8 - 8.0 7.9 7.9
192. - 194. 193. 194.
0.056 - 0.073 0.067 0.069
0.008 - 0.013 0.010 0.010
0.280 - 0.310 0.294 0.290
0.240 - 0.260 0.246 0.240
1.000 - 1.600 1.300 1.400
0.520 - 0.550 0.540 0.550
1.310 - 1.880 1.594 1.680
13.5 - 14.5 14.0 14.0
0.4 - 1.0 0.7 0.7
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B. Biological characteristics:
1. Phytoplankton -
Sampling
Date
04/19/74
07/03/74
09/24/74
2. Chlorophyll a_ -
Sampling
Date
04/19/74
07/03/74
09/24/74
Dominant
Genera
1. Cyclotella sp.
2. Flagellates
3. Cryptomonas sp.
4. Chlamydomonas sp.
5. Aphanizomenon sp_.
Other genera
Total
1. Cryptomonas sp.
2. Centric diatoms
3. Nitzschia sp.
4. Melosira'sp.
5. Lepocinclis sp.
Other genera
Total
1. Aphanizomenon sp.
2. Cryptomonas sp.
3. Flagellates
4. Chlamydomonas sp.
5. Cruci gem'a sp.
Other genera
Total
Station
Number
1
2
1
2
1
2
Algal Units
per ml
16,387
712
574
122
52
243
18,090
502
413
325
59
59
118
1,476
4,451
Chlorophyll
(ug/D
24.4
34.9
4.2
18.7
14.5
13.5
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C. Limiting Nutrient Study:
1. Autoclaved, filtered, and nutrient spiked -
a. April sample -
Spike (mg/1)
Control
0.050 P
0.050 P + 1.0 N
1.0 N
b. September sample -
Ortho P
Cone, (mg/1)
Inorganic N Maximum yield
Cone, (mg/1) (mg/1-dry wt.)
0.010
0.060
0.060
0.010
2.220
2.220
3.220
3.220
0.2
18.7
16.3
0.2
Spike (mg/1)
Control
0.050 P
0.050 P + 1.0 N
1.0 N
Ortho P
Cone, (mg/1)
0.015
0.065
0.065
0.015
Inorganic N Maximum yield
Cone, (mg/1) (mg/1-dry wt.)
0.532
0.532
1.532
1.532
5.0
17.5
30.0
4.9
2. Discussion -
The control yield of the assay alga, Selenastrum capri-
cornutum, indicates that the potential primary productivity
of Rock Creek Lake was low in April but was moderately high
in September.
The results also indicate that Rock Creek Lake was
phosphorus limited at those times. Note that the addition
of only phosphorus resulted in a significant increase in
yield but no increase in yield occurred with the addition
of nitrogen only.
The mean lake inorganic nitrogen/orthophosphorus ratios
also indicate phosphorus limitation; i. e,. the N/P ratios
were 54/1 or greater at all sampling stations and times.
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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 months of April and May when two samples were collected.
Sampling was begun in August, 1974, and was completed in May, 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" ("ZZ" of U.S.G.S.) were esti-
mated 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 Rock Creek Lake during the sampling
year.
* See Working Paper No. 175.
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Waste Sources:
1. Known domestic -
Name
Rock Creek
State Park
Pop.
Served
Mean Flow
Treatment (m3/d)
stab, ponds ?
2. Known industrial - None
Annual Total Phosphorus Loading - Average Year:
1. Inputs -
Source
kg P/
yr
a. Tributaries (non-point load) -
Rock Creek 5,255
b. Minor tributaries & immediate
drainage (non-point load) - 2,825
c. Known municipal STP's -
d. Septic tanks -
e. Known industrial -
f. Direct precipitation** - 45
Total 8,125
2. Outputs -
Lake outlet - Rock Creek 1,450
3. Net annual P accumulation - 6,675 kg.
Receiving
Water
no discharge*
% of
total
64.7
34.8
0.5
100.0
* Ruchti, 1976.
** See Working Paper No. 175.
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10
Annual Total Nitrogen Loading - Average Year:
1. Inputs -
Source
kg N/
yr
a. Tributaries (non-point load) -
Rock Creek 58,165
b. Minor tributaries & immediate
drainage (non-point load) - 31,450
c. Known municipal STP's - None
d. Septic tanks - None
e. Known industrial - None
f. Direct precipitation* - 2.805
Total 92,420
2. Outputs -
Lake outlet - Rock Creek 70,375
3. Net annual N accumulation - 22,045 kg.
Non-point Nutrient Export by Subdrainage Area:
Tributary kg P/km2/yr
Rock Creek 77
% of
total
62.9
34.0
3.1
100.0
kg N/kiti2/yr
857
* 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/mVyr 3.12 2.57 35.5 8.5
Vollenweider phosphorus loadings
(g/m2/yr) based on mean depth and mean
hydraulic retention time of Rock Creek Lake.
"Dangerous" (eutrophic loading) 0.52
"Permissible" (oligotrophic loading) 0.26
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12
LITERATURE REVIEWED
Anonymous, 1972. Rock Creek State Park brochure. IA Cons. Comm.,
Des Moines.
Anonymous, 1973. 1969 Census of Agriculture, vol. 5, part 15.
U.S. Dept of Commerce, Wash., DC.
Bachmann, R. W., and J. R. Jones, 1973. Relationship between
livestock and phosphorus inputs to the Iowa Great Lakes in
1971 and 1972. MS, Dept. Zoo. & Ent., IA St. U., Ames.
Harrison, Harry M., 1975. Personal communication (lake morphometry).
IA Cons. Comm., Des Moines.
, 1976. Personal communication (waterfowl numbers
at Rock Creek Lake). IA Cons. Comm., Des Moines.
Ruchti, Roger (Park Officer), 1976. Personal communication (waste
treatment facilities at Rock Creek State Park). Kellogg.
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 RANMNGS
LAKE
CODE LAKE NAME
1901 LAKE ACGUAdI
1902 BIG CREEK RESERVOIR
1903 BLACK HAWK LAKE
1904 CLEAR LAKE
1905 LAKE DARLING
1906 LOST ISLAND LAKE
1907 LAKE MACBRIOE
1908 PRAIRIE ROSE LAKE
1909 RATHBUN RESERVOIR
1910 RED ROCK LAKE
1911 ROCK CREEK LAKE
1912 SILVER LAKE
1913 SPIRIT LAKE
1914 VIKING LAKE
19J5 WEST LAKE OKOBOJI
MEOIAN
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
MEOIAN
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
CMLOP.A
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
MEOIAN
OISS OKThO 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 ACOUABI
190? BIG CREEK RESERVOIR
1903 BLACK HAWK LAKE
1904 CLEAR LAKE
1905 LAKE DARLING
1906 LOST ISLAND LAKE
1907 LAKE M4C8RIDE
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
57 (
89 (
7 (
71 (
29 (
21 (
64 <
79 (
43 (
1* «
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 (
14 (
50 <
43 <
86 (
64 (
29 t
0 (
79 (
21 (
100 (
13)
8)
1)
5)
10)
2)
7)
6)
12)
9)
4)
0)
11)
3)
14)
15-
MIN DO
100 (
21 I
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 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
32*.
263
375
319
167
314
107
504
250
428
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LAKES RANKED BY INDEX NOS.
RANK LAKE CODE LAKE NAME INDEX NC
1 1913 SPIRIT LAKE 504
2 1915 WEST LAKE OK080JI 428
3 1901 LAKE ACOUABI 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
-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 FOR IOWA
12/23/75
LAKE CODE 1911
ROCK CREEK RES.
SUB-DRAINAGE
TRIBUTARY AREA(SO KM)
1911A1
1911A2
1911ZZ
107.2
67.9
39.4
OF LAKE (SO KH) 107,
JAN
0.28
0.17
0.10
FEB
0.87
0.55
0.32
MAR
1.40
0.89
0.52
.2
APR
0.78
0.50
0.29
MAY
0.91
0.57
0.33
NORMALIZED FLOWS(CMS)
JUN JUL AUG
1.07
0.68
0.39
0.62
0.39
0.23
0.
0.
0.
21
13
08
SEP
0.20
0.13
0.07
OCT NOV
0.21 0.22
0.13 0.14
0.08 0.08
DEC MEAN
0.15 0.57
0.09 0.36
0.05 0.21
SUMMARY
OTAL
;UM OF
DRAINAGE AREA OF LAKE '
SUB-DRAINAGE AREAS =
107.2
107.2
TOTAL
TOTAL
FLOW
FLOW
IN «
OUT =>
6.93
6.93
MEAN MONTHLY FLOWS AND DAILY FLOWS(CMS)
TRIBUTARY MONTH YEAR MEAN FLOW DAY
1911A1
1911A2
1911ZZ
8
9
10
11
12
1
2
3
4
S
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
0.23
0.07
0.08
0.28
0.34
0.22
0.16
1.22
0.85
0.48
1.02
0.40
0.16
0.05
0.05
0.21
0.22
0.14
0.10
0.76
0.54
0.31
0.71
0.27
0.09
0.03
0.03
0.12
0.13
0.08
0.06
0.45
0.31
0.18
0.42
0.16
17
14
19
16
13
11
22
16
5
18
17
14
19
16
13
11
22
16
5
18
FLOW DAY
FLOW DAY
FLOW
0.18
0.07
0.06
0.27
0.34
.20
.18
.31
.65
.42
0.13
0.05
0.04
0.19
0.22
0.12
0.11
0.20
0.40
0.26
19
25
19
25
0.68
0.37
0.42
0.23
-------
APPENDIX D
PHYSICAL and CHEMICAL DATA
-------
STORET RETRIEVAL DATE 75/13/23
191101
41 44 27.0 092 51 20.0
ROCK CREEK LAKE
19 IOWA
11EPALES
4
2111202
0020 FEET
DEPTH
DATE
FROM
TO
74/04/19
74/07/03
74/09/24
DATE
FROM
TO
74/04/19
74/07/03
74/09/24
TIME DEPTH
OF
DAY FEET
16 00 0000
16 00 0005
16 00 0015
09 30 0000
09 30 0005
09 30 0012
09 30 0000
09 30 0005
09 30 0014
TIME DEPTH
OF
DAY FEET
16 00 0000
16 00 0005
16 00 0015
09 30 0000
09 30 0004
09 30 0000
09 30 0001
09 30 0005
09 30 0006
09 30 0014
00010
WATER
TEMP
CENT
11.7
11.5
11.5
23.7
23.7
23.6
16.4
16.4
16.3
00665
PHOS-TOT
MG/L P
0.064
0.061
0.071
0.056
0.064
0.072
00300
DO
MG/L
11.4
10.4
6.B
6.6
6.6
7.4
7.0
6.0
32217
CHLRPHYL
A
UG/L
24.4
4.2
14.5
00077
TRANSP
SECCHI
INCHES
25
12
40
00031
INCDT LT
REMNING
PERCENT
1.0
50.0
1.0
FIELD
194
:TVY
i
IMHO
83
161
225
369
369
368
337
265
337
00400
PH
su
8.70
8.65
8.60
7.80
7.80
7.80
7.85
7.89
7.87
00410
T ALK
CAC03
MG/L
138
137
136
194
194
192
00610
NH3-N
TOTAL
MG/L
0.050
0.040
0.040
0.260
0.240
0.240
00625
TOT KJEL
N
MG/L
1.000
0.800
0.600
1.400
1.000
1.100
00630
N021N03
N- TOTAL
MG/L
2.320
2.210
2.360
0.290
0.310
0.310
00671
PHOS-DIS
ORTHO
MG/L P
0.007
0.005
0.007
0.012
0.009
0.010
-------
STORET RETRIEVAL DATE 75/13/23
191102
41 46 30.0 092 50
ROCK CREEK LAKE
19 IOMA
15.0
DATE
FROM
TO
74/04/19
74/07/03
74/09/24
TIME DEPTH
OF
DAY FEET
16 15 0000
16 15 0005
09 55 0000
09 55 0003
10 00 0000
10 00 0005
00010
WATER
TEMP
CENT
12.7
12.6
24.8
24.7
15.6
15.5
00300 00077 00094
00 TRANSP CNDUCTVY
SECCHI FIELD
MG/L INCHES MICROMHO
13.8
7.2
7.4
8.2
8.0
18
8
14
91
168
455
450
333
333
11EPALES
4
00400
PH
SU
8.70
8.70
8.00
7.90
8.02
8.03
00410
T ALK
CAC03
MG/L
146
145
193
194
2111202
0007
00610
NH3-N
TOTAL
MG/L
0.030
0.030
0.250
0.240
FEET DEPTH
00625
TOT KJEL
N
MG/L
0.900
0.900
1.600
1.400
00630
N02&N03
N-TOTAL
MG/L
2.270
2.390
0.280
0.280
00671
PHOS-DIS
ORTHO
MG/L P
0.004
0.004
0.006
0.013
0066S
DATE TIME DEPTH PHOS-TOT
FROM OF
TO DAY FEET MG/L P
74/04/19 16 15 0000 0.065
16 15 0005 0.066
74/07/03 09 55 0000
74/09/24 10 00 0000 0.073
10 00 0001
10 00 0005 0.069
10 00 0006
32217 00031
CHLRPHYL INCDT LT
A REMNING
UG/L PERCENT
34.9
18.7
13.5
SO.O
1.0
-------
APPENDIX E
TRIBUTARY DATA
-------
STORET RETRIEVAL DATE 76/01/37
1911A1
41 43 20.0 092 51 00.0
HOCK CREEK
19125 JASPER CO HWY MP
0/ROCK CREEK RESERVOIR
BRDG JUST S OF ROCK CREEK STATE PARK
HEP ALES 2111204
4 0000 FEET DEPTH
DATE
FROM
TO
74/08/17
74/09/14
74/10/19
74/11/16
74/12/13
75/01/11
75/02/22
75/03/16
75/04/05
75/04/19
75/05/05
75/05/25
TIME DEPTH
OF
DAY FEET
15 20
14 10
14 00
13 30
12 50
10 15
14 00
14 00
14 30
13 15
13 30
00630
N02&N03
N-TOTAL
MG/L
1.680
0.490
0.240
0.480
0.768
1.160
2.760
1.500
1.570
1.570
1.600
1.500
00625
TOT KJEL
N
MG/L
1.100
1.000
0.600
1.500
1.200
1.700
0.100
1.050
1.850
2.000
1.150
0.700
00610
NH3-N
TOTAL
MG/L
0.095
0.050
0.060
0.270
0.348
0.352
0.085
0.270
0.825
0.720
0.085
0.100
00671
PHOS-DIS
ORTHO
MG/L P
0.010
0.015
0.015
0.015
0.015
0.020
0.023
0.010
0.030
0.030
0.075
0.005
00665
PHOS-TOT
MG/L P
0.045
0.055
0.030
0.070
0.040
0.050
0.040
0.060
0.090
0.100
0.075
0.040
-------
STORET RETRIEVAL DATE 76/01/27
1911A2
41 49 00.0 092 50 00.0
ROCK CREEK
19 JASPER CO HWY MP
T/ROCK CHEEK RESERVOIR
BRDG JUST N OF ROCK CREEK STATE PARK
11EPALES 2111204
4 0000 FEET DEPTH
DATE
FROM
TO
74/08/17
74/09/14
74/10/19
74/11/16
74/12/13
75/01/11
75/02/22
75/03/16
75/04/05
75/04/19
75/05/16
75/05/25
TIME DEPTH
OF
DAY FEET
15 50
13 45
13 47
13 50
13 15
10 35
14 15
14 25
14 55
13 25
13 40
00630
N02&N03
N-TOTAL
MG/L
4.700
2.880
2.640
4.700
4.700
3.680
2.610
2.300
1.600
4.800
4.200
4.200
00625
TOT KJEL
N
MG/L
0.600
0.900
0.700
0.600
0.900
1.900
0.100K
1.180
1.650
3.750
1.050
1.250
00610
NH3-N
TOTAL
MG/L
0.035
0.045
0.090
0.075
0.100
0.432
0.024
0.175
0.780
0.150
0.070
0.030
00671
PHOS-DIS
ORTHO
MG/L P
0.055
0.040
0.035
0.040
0.035
0.065
0.044
0.040
0.030
0.070
0.050
0.045
00665
PHOS-TOT
MG/L P
0.110
0.110
0.080
0.180
0.140
0.300
0.046
0.140
0.310
0.800
0.440
0.260
K VALUE KNOWN TO BE
LESS THAN INDICATED
------- |