U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
BUFALOLAKE
WRIGKT COUNTY
MINNESOTA
EPA REGION V
UORKING PAPER No,
PACIFIC NORTHWEST ENVIRONMENTAL RESEARCH LABORATORY
An Associate Laboratory of the
NATIONAL ENVIRONMENTAL RESEARCH CENTER - CORVALLIS, OREGON
and
NATIONAL ENVIRONMENTAL RESEARCH CENTER - LAS VEGAS, NEVADA
•fr GPO 697-O32
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REPORT
ON
BUFFALO LAKE
WRIGHT COUNTY
MINNESOTA
EPA REGION V
WORKING PAPER No,
WITH THE COOPERATION OF THE
MINNESOTA POLLUTION CONTROL AGENCY
AND THE
MINNESOTA NATIONAL GUARD
DECEMBER, 1974
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1
CONTENTS
Page
Foreword ii
List of Minnesota Study Lakes iv, v
Lake and Drainage Area Map
Sections
1. Conclusions 1
II. Lake and Drainage Basin Characteristics 3
III. Lake Water Quality Summary 4
IV. Nutrient Loadings 9
V. Literature Reviewed 14
\!I. ppendices 15
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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 fresh water 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 [ 3O3(e)], water
quality criteria/standards review [ 3O3(c)], clean lakes [ 5314(a,b)],
and water quality monitoring [ 1O6 and §305(b)] activities mandated
by the Federal Water Pollution Control Act Amendments of 1972.
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111
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
fresh water 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 Minnesota Pollution Control
Agency for professional involven’rent and to the New York National
Guard for conducting the tributary sampling phase of the Survey.
Grant J. Merritt, Director of the Minnesota Pollution Control
Agency, John F. McGuire, Chief, and Joel G. Schilling, Biologist,
of the Section of Surface and Groundwater, Division of Water Quality,
provided invaluable lake documentation and counsel during the course
of the Survey; and the staff of the Section of Municipal Works, Divi-
sion of Water Quality, were most helpful in identifying point sources
and soliciting municipal participation in the Survey.
Major General Chester J. Moeglein, the Adjutant General of
Minnesota, and Project Officer Major Adrian Beltrand, who directed
the volunteer efforts of the Minnesota National Guardsmen, are also
gratefully acknowledged for their assistance to the Survey.
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iv
NATIONAL EUTROPHICATION SURVEY
STUDY LAKES
STATE OF MINNESOTA
LAKE NAME COUNTY
Albert Lea Freeborn
Andrusia Beltrami
Badger Polk
Bartlett Koochiching
Bear Freeborn
Bemidji Beltrami
Big Stearns
Big Stone Big Stone, MN; Roberts,
Grant, SD
Birch Cass
Blackduck Beltranii
Blackhoof Crow Wing
Budd Martin
Buffalo Wright
Calhoun Hennepin
Carlos Douglas
Carrigan Wright
Cass Beltrami, Cass
Clearwater Wright, Stearns
Cokato Wright
Cranberry Crow Wing
Darling Douglas
Elbow St. Louis
Embarass St. Louis
Fall Lake
Forest Washington
Green Kandiyohi
Gull Cass
Heron Jackson
Leech Cass
Le Homme Dieu Douglas
Lily Blue Earth
Little Grant
Lost St. Louis
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V
LAKE NAME COUNTY
Madison Blue Earth
Malmedal Pope
Mashkenode St. Louis
McQuade St. Louis
Minnetonka Hennepin
Minnewaska Pope
Mud Itasca
Nest Kandiyohi
Pelican St. Louis
Pepin Goodhue, Wabasha, MN;
Pierce, Pepin, WI
Rabbit Crow Wing
Sakatah Le Sueur
Shagawa St. Louis
Silver McLeod
Six Mile St. Louis
Spring Washington, Dakota
St. Croix Washington, MN; St. Croix,
Pierce, WI
St. Louis Bay St. Louis, MN; Douglas, WI
Superior Bay St. Louis, MN; Douglas, WI
Swan Itasca
Trace Todd
Trout Itasca
Wagonga Kandiyohi
Wallmark Chisago
White Bear Washington
Winona Douglas
Wolf Beltrami, Hubbard
Woodcock Kandiyohi
Zurnbro Olmstead, Wabasha
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I Ia Locati
c d
(
BUFFALO LAKE
Tribu ry Sampling Site
Lake Sampling Site
Sewage Treatment Facility
Direct Drainage Area Limits
‘ii le
930 491
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BUFFALO LAKE
STORET NO. 2713
I. CONCLUSIONS
A. Trophic Condition:
Survey data and the data of others show that Buffalo Lake
is eutrophic. Of the 60 Minnesota lakes sampled in the fall
of 1972 when essentially all were well-mixed, 43 had less mean
total phosphorus, 46 had less mean dissolved phosphorus, and
47 had less mean inorganic nitrogen. Of the 80 Minnesota lakes
sampled, 47 lakes had less mean chlorophyll a, and 37 had greater
mean Secchi disc transparency.
Survey limnologists noted algal blooms during the June and
August sampling dates. Also, rooted aquatic vegetation was
present in the shallow areas of the lake.
B. Rate-Limiting Nutrient:
The algal assay results show that nitrogen was the limiting
nutrient at the time the sample was collected. Also, the lake
data show that N/P ratios were less than 14/1 on all sampling oc-
casions, and nitrogen limitation would be expected.
C. Nutrient Controllability:
1. Point sources--During the sampling year, Buffalo Lake
received a total phosphorus load at a rate over three times the
rate proposed by Vollenweider (in press) as “dangerous”; i.e.,
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2
a eutrophic rate (see page 13). It is calculated that the
City of Buffalo contributed about 56% of the total phosphorus
load.
Complete removal of phosphorus at the point source would
reduce the loading rate to 0.61 g/m 2 /yr. This rate is still
in excess of the eutrophic rate; and, while at least some im-
provement of the trophic condition of the lake would be expected,
it appears that non-point source phosphorus control (see below)
would be necessary to bring about a substantial improvement in
the trophic condition of Buffalo Lake.
2. Non-point sources (see page 13)--The phosphorus exports
of the Buffalo Lake tributaries were very high as compared to
the mean phosphorus export of the three tributaries of nearby
Clearwater Lake* (53 lbs/mi 2 /yr). The high export rates and the
low N/P export ratios indicate unknown point sources in the drain-
age that may be amenable to control. A need for further study
of the high phosphorus export rates is indicated.
In all, it is estimated that non-point (7) sources contributed
about 43% of the total phosphorus load to Buffalo Lake during the
sampling year.
* Working Paper No. 93.
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3
II. LAKE AND DRAINAGE BASIN CHARACTERISTICS
A. Lake Morphometry :
1. Surface area: 1,510 acres.
2. Mean depth: 14.5 feet.
3. Maximum depth: 30 feet.
4. Volume: 21,895 acre/feet.
5. Mean hydraulic retention time: 1.4 years.
B. Tributary and Outlet:
(See Appendix A for flow data)
1. Tributaries —
Name Drainage area* Mean flow*
Mill Creek 30.2 nh 2 15.3 cfs
Unnamed Creek (C-l) 2.8 mi 2 1.6 cfs
Minor tributaries & 2
immediate drainage - 8.6 mi 5.2 cfs
Totals 41.6 mi 2 22.1 cfs
2. Outlet -
Mill Creek 44.0 mi 2 ** 22.1 cfs
C. Precipitatiori***:
1. Year of sampling: 26.9 inches.
2. Mean annual: 25.6 inches.
t DNR lake survey map (1964); mean depth by random-dot method.
* Drainage areas are accurate within ±5%; mean daily flows are accurate
within ±10%; and ungaged flows are accurate within ±10 to 25% for
drainage areas greater than 10 mi 2 .
** Includes area of lake.
See Working Paper No. 1, “Survey Methods”.
UBRAB? / EPA
Nat onaI Environmental Rese&rch Ceut
200 S W 35th Street
Corvallis, Oregon 97330
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4
III. LAKE WATER QUALITY SUMMARY
Buffalo Lake was sampled three times during the open-water season of
1972 by means of a pontoon-equipped Huey helicopter. Each time, samples
for physical and chemical parameters were collected from two stations on
the lake and from two or more depths at each station (see map, page vi).
During each visit, a single depth-integrated (near bottom to surface)
sample was composited for phytoplankton identification and enumeration;
and during the last visit, a single five-gallon depth-integrated sample
was composited for algal assays. Also each time, a depth-integrated sam-
ple was collected for chlorophyll a analysis. The maximum depths sampled
were 15 feet at station 1 and 15 feet at station 2.
The results obtained are presented in full in Appendix B, and the
data for the fall sampling period, when the lake essentially was well-
mixed, are summarized below. Note, however, the Secchi disc summary
is based on all values.
For differences in the various parameters at the other sampling
times, refer to Appendix B.
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5
A. Physical and chemical characteristics:
FALL VALUES
(10/26/72)
Parameter Minimum Mean Median Maximum
Temperature (Cent.) 5.8 6.0 6.0 6.3
Dissolved oxygen (mg/i) 11.8 11.9 11.9 12.0
Conductivity (jirnhos) 400 410 410 420
pH (units) 8.8 8.8 8.8 8.9
Alkalinity (mg/i) 171 175 175 181
Total P (mg/i) 0.197 0.214 0.211 0.232
Dissolved P (mg/l) 0.147 0.162 0.161 0.179
NO + NO (mg/i) 0.100 0.193 0.200 0.240
Ani onia mg/1) 0.300 0.570 0.620 0.630
ALL VALUES
Secchi disc (inches)
22 41
22 78
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6
B. Biological characteristics:
1. Phytoplankton -
Sampling Dominant Number
Date Genera per ml
06/30/72 1. Anabaena 14,318
2. Dinobryon 758
3. Synedra 454
4. Mallomonas 303
5. Asterionella 76
Other genera 0
Total 15,909
08/29/72 1. Anabaena 470
2. Cyclotella 398
3. Fragilaria 320
4. Dinobryon 181
5. Stephanodiscus 96
Other genera 182
Total 1 ,647
10/26/72 1 . Anabaena 2,085
2. Flagellates 1,281
3. Stephanodiscus 528
4. Dinobryon 452
5. Melosira 301
Other genera 1 ,459
Total 6,106
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7
01
02
01
02
0.4
3.8
98.4
40.3
Maximum yield
( mg/i-dry wt. )
16.2
15.3
15.1
16.4
16.3
68.9
40.7
2. Chlorophyll a -
(Because of instrumentation problems during the 1972 sampling,
the following values may be in error by plus or minus 20 percent.)
Sampling Station Chlorophyll a
Date Number ( pg/i )
06/30/72 01 39.7
02 45.9
08/29/72
10/26/72
C. Limiting Nutrient Study:
1. Autoclaved, filtered, and nutrient spiked —
Ortho P Inorganic N
Spike (mg/i) Conc. (mg/l) Conc. (mg/l ) _____________
Control 0.062 0.595
0.005 P 0.067 0.595
0.010 P 0.072 0.595
0.020 p 0.082 0.595
0.050 P 0.112 0.595
0.050 P + 10.0 N 0.112 10.595
10.0 N 0.062 10.595
2. Discussion -
The control yield of the assay alga, Selenastrum capri-
cornutum , indicates that the potential primary productivity
of Buffalo Lake was high at the time the sample was taken.
Also, the lack of significant increase in yield with incre-
asing levels of orthophosphate, and the significant increase
in yield with nitrogen alone or in combination with phos-
phorus, indicates the lake was nitrogen limited at the time
of sampling.
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8
The lake data indicate nitrogen limitation for all
sampling periods; nitrogen to phosphorus ratios were
6 to 1 or less, and nitrogen limitation would be expected.
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9
IV. NUTRIENT LOADINGS
(See Appendix C for data)
For the determination of nutrient loadings, the Minnesota National
Guard collected monthly near-surface grab samples from each of the tribu-
tary sites indicated on the map (page vi), exceptfor the high runoff
months of April and May when two samples were collected. Sampling was
begun in October, 1972, and was completed in September, 1973.
Through an interagency agreement, stream flow estimates for the year
of sampling and a “normalized” or average year were provided by the
Minnesota District Office of the U.S. Geological Survey for the tributary
sites nearest the lake.
In this report, nutrient loads for sampled tributaries were deter-
mined by using a modification of a U.S. Geological Survey computer
program for calculating stream loadings*. Nutrient loadings for unsam-
pled “minor tributaries and immediate drainage” (“ZZ” of U.S.G.S.) were
estimated by using the nutrient loads, in lbs/mi 2 /year, in Mill Creek,
at station A-i and multiplying by the ZZ area in mi 2 .
The operator of the Buffalo wastewater treatment plant provided monthly
effluent samples and corresponding flow data.
* See Working Paper No. 1.
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10
A. Waste Sources:
1. Known municipar -
Pop. Mean Receiving
Name Served Treatment Flow (mgd) Water
Buffalo 2,950 trickling 0.413 Buffalo Lake
filter
2. Known industrial - None
* Anonymous, 1974.
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11
B. Annual Total Phosphorus Loading - Average Year:
1. Inputs -
lbsP/ %of
Source yr total
a. Tributaries (non-point load) -
Mill Creek 5,740 30.4
Unnamed Creek (C-i) 620 3.3
b. Minor tributaries & immediate
drainage (non-point load) - 1,630 8.6
c. Known municipal STP’s -
Buffalo 10,630 56.2
d. Septic tanks* - 50 0.3
e. Known industrial - None -
f. Direct precipitation** - 240 1.2
Total 18,910 100.0
2. Outputs -
Lake outlet - Mill Creek 8,710
3. Net annual P accumulation - 10,200 pounds
* Estimate based on3O permanent and 2 seasonal shoreline dwellings and
3 resorts; see Working Paper No. 1.
** See Working Paper No. 1.
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12
C. Annual Total Nitrogen Loading - Average Year:
1. Inputs -
lbs N I %of
Source yr total
a. Tributaries (non-point load) -
Mill Creek 63,970 50.1
Unnamed Creek (C-i) 6,930 5.4
b. Minor tributaries & immediate
drainage (non-point load) - 18,210 14.2
c. Known municipal STP’s -
Buffalo 22,240 17.4
d. Septic tanks* - 1,880 1.5
e. Known industrial - None - -
f. Direct precipitation** - 14,550 11.4
Total 127,780 100.0
2. Outputs -
Lake outlet - Mill Creek 113,400
3. Net annual N accumulation - 14,380 pounds
* Estimate based on 30 permanent and 2 seasonal shoreline dwellings and
3 resorts; see Working Paper No. 1.
** See Working Paper No. 1.
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13
D. Mean Annual Non-point Nutrient Export by Subdrainage Area:
Tributary lbs P/mi 2 /yr lbs N/mi 2 /yr N/P Ratio
Mill Creek 190 2,118 11/1
Unnamed Creek (C-i) 221 2,475 11/1
E. Yearly Loading Rates:
In the following table, the existing phosphorus loading
rates are compared to those proposed by Vollenweider (in press).
Essentially, his “dangerous” rate is the rate at which the
receiving water would become eutrophic or remain eutrophic; his
“permissible” rate is that which would result in the receiving
water remaining oligotrophic or becoming oligotrophic if mor-
phometry permitted. A mesotrophic rate would be considered one
between “dangerous” and “permissible”.
Total Phosphorus Total Nitrogen
Units Total Accumulated* Total Accumulated
1bs/acr /yr 12.5 6.8 84.6 9.5
grams/me/yr 1.40 0.76 95 1.1
Volle weider loading rates for phosphorus
(g/m /yr) based on mean depth and mean
hydraulic retention time of Buffalo Lake:
“Dangerous” (eutrophic rate) 0.38
“Permissible” (oligotrophic rate) 0.19
* The outlet station sampled is separated from Buffalo Lake by Deer Lake,
and some sedimentation and/or biological assimilation of phosphorus in
Deer Lake may have occurred. However, the hydraulic retention time of
Deer Lake probably is short, and phosphorus accumulation there would be
expected to be minimal.
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14
V. LITERATURE REVIEWED
Anonymous, 1974. Wastewater disposal facilities inventory. MPCA,
Minneapolis.
Anderson, Dennis, 1970. Report on investigation of the water quality
and sources of pollution of Buffalo Lake, Wright County,
Minnesota. MPCA, Minneapolis.
Ketelle, Martha J., and Paul D. Uttormark, 1971. Problem lakes
in the United States. EPA Water Poll. Contr. Res. Ser.,
Proj. #16010 EHR.
Vollenweider, Richard A., (in press). Input -output models. Schweiz
A. Hydrol.
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15
VII. APPENDICES
APPENDIX A
TRIBUTARY FLOW DATA
-------
TPIBUTARY FLOW INFORMATION FOP MINNESOTA
10/30/74
LA’
-------
LA F COPE 2713
IFFALO LAKE
TPTB’JTA Y FLOW INFO MAT!ON FOP MINNESOTA
10/30/74
MEAN MONTHLY FLOWS ANt) DAILY FLOWS
TPI LJTARY MONrH YEA’ ME N FLAW PAY FLOW DAY FLOW DAY
10
77
.7l
14
5.70
11
72
6.39
P4
7.50
12
77
4 .R3
19
4.40
1
71
7.11
20
5.00
73
2. 3
1
2.60
3
73
9.76
10
5.90
4
73
17.00
P
1. ..0fl
S
73
13 . 0
13
13.00
6
73
9..9
17
8.50
7
73
?.PS
73
.6()
16
2.?0
9
73
3•05
25
1.70
FLOW
23
27
8.60
14.00
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APPENDIX B
PHYSICAL and CHEMICAL DATA
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ST3RET RETRIEVAL DATE 74/10/30
27130 1
45 10 15.0 093 52 ‘.3.0
3UFFALO LA’ F
27 MINNESOTA
1 1EPALES
3
OATF
FROM
TO
TTMF DEPTH
0F
DAY FEET
72/06/33 17 10 0000
17 30 0015
72/08/29 14 ‘.‘; 0000
14 45 0004
)4 45 0015
72/10/26 09 00 0000
09 30 0004
09 00 0015
2111202
C019 FEET DFPTI-4
00400 00410
PH T 8(.K
CACO3
SO MG/L
003fl0 00077
DO T4ANSP
SECCHI
INCHES
17.0
c.6
1.4
22
1?.0
12.0
00094
C r4Dhi C T V Y
FI [ L )
M ICROMrIO
380
400
380
380
380
410
410
410
C)1)fl 10
WATEP
TEMP
C F NT
75•f)
71.2
23. 1
19.7
6.3
32717
C .- LDP, lYL
iJ(,/ L
39.7J
0 •
00665 00666
P- os-ToI PHOS—DIS
MG/L P MG/L P
9.30
8.70
8.45
8.50
8.25
8.90
8.90
.4 • 90
00630
NO2 NO I
N—TOTAL
MG/L
0.050
0.050
0.0 30
0 • 070
3.060
U. 100
O • 220
0 • 240
153
158
167
170
167
181
176
176
00610
N P13 N
TOTAL
MGI L
0.060
0.400
0. 2O
0.690
O • 970
0. 620
O • 300
O • 630
DATE
F P OM
TO
77/Oh/IC)
7?/ OR/2Q
7?/ 10/26
T1 E DEPTH
OF
UAY FEET
17 30 0000
14 45 0000
09 1)0 0000
0 .225
0.316
0. 182
0.181
0.186
0.212
0.232
0.222
0.166
0.244
0.162
0.157
0.0P0
0.166
0.171
0. 179
j VALUE KNOWN TO 8E IN FPROR
-------
sTOr?F.T ET )frvA( 1AT’- I-.f h/ n
?7130?
0 24.0 001 63 - 0.0
‘itjcFaLr, LAKE
MINNFSOTA
IJEPALES ?111202
0013 FFFT
1)AT
Ti
T M ,)V .)T-1
OF
flAY FFT
3
72/06/10 17 15 O00
17 15 0015
72/00/70 34 10 fl(’OO
I’ 0 t• 00• .
14 10 0015
72/ 10/7 ” 09 10 Q100
‘ 15 ( 34
00 35
BE , T -4
()I .
0 1.’
l Ou/7
0u0 9 4
00400
00410
0 ”30
00’-.10
00665
00666
,,ATF
flO
Tr ”ANSP
CivPIJCFVY
1-l
T
L’c
N07 NO3
Nr13—NJ
PriOS—TOT
PrIOS—DIS
T’’4
Sr CCH1
FftLt)
(ACO3
N—TOTAL
TOTAL
CF T
“ /L
I Cr1F -
‘11Ckt) 1r-iO
SU
M0/L
M(,/L
4G/L
‘i( /L P
MG/L P
1”.?
185
9.20
140
0.060
0.070
0.352
0.177
?.
410
IHO
9. 20
H.5 0
if ’?
162
0.050
0.060
0.740
0.740
0.336
0.172
0.300
0.152
‘ •
.
190
p.43
163
0.060
0.710
0.167
0.158
1. -
22
390
420
b.3’)
8.80
164
173
0.070
0.200
0.810
0.630
0.180
0.197
0.157
0.147
l1.’
400
8.80
171
0.2’)O
0.620
0.?OH
0.153
1). ’ ’
410
.80
1’)
0.200
0.620
0.21
0.157
OA T
10
7? / ii f’/ 10
7?/0 / 20
72/1 0/?
I i 1 ’ I
( I
[ ,AY F F T
37 15 )r ir,
It. n
00 15 o1r’
4 5
• 3
J VALIJ P( J0 1 0 ‘—E - - ‘
-------
APPENDIX C
TRIBUTARY and WASTEWATER
TREATMENT PLANT DATA
-------
STO ET PET IEV4L DATE 74/10/30
2713A1 LS2713A1
45 it) 18.0 093 54 30.0
MILL CREEK
27 15 BUFFALO
I/BUFFALO LA’cE
Co HWY 35 rIRDO 1.25
I 1EPALFS
4
P1 W OF BUFFALO
2111204
0000 FEET
DEPTH
( ( I33
)O6?5
0O 10
00671
00665
DATE
TPIF
OF T-’
\IO2 NO3
TOr KJFI
N-li—N
P lOS—flIS
PHOS—TOT
FROM
OF
J—T’)TAL
N
TOTAL
OPTHO
TO
flAY
FEET
M( /L
M/L
N15/L
MG/L P
MG/L i
7?/I0/14
13
20
C.100
1. 15
0.096
0.066
0.150
72/11/1M
15
25
‘i. 10
1.300
3.094
0.06M
0.105
72/1 /1
1?
‘10
fl•74)
1.500
0.105
0.052
0.090
71/01/20
11
30
U.6 0
1. 0fl
0.310
0.126
0.160
73/02/19
1?
?0
0.700
1.440
fl.J91
O.13
0.200
71/01/10
10
30
1.1 U
3.100
u.7d0
0.400
0.5 1 5
71/04/OP
ii
65
0.01 1K
1.P O
(,.0?4
0.050
0.135
73/04/21
Z.)10
1.400
O.00 -
0.037
0.135
71/05/1
10
50
0.0I0
1. 00
0.069
0.04R
0.1 4
73/05/27
16
45
0.940
).10?
0.110
0.220
71/06/17
ii
50
0.150
1.100
0.091
0.120
0.24fl
71/08/If’
09
?0
L .? 3 0
0 .R40
fl .t)44
0.075
0.155
71/09/25
10
0
0.360
fl .1 5
0.039
0.044
0.090
K VALUE KNOWN TO RE LESS
T 1AN INDICATED
-------
ST’)T ETR1 V L i)AT’ 7”/1 /3 j
? 13 1 LS2713R1
45 O i 30.0 093 54 30.0
DEEP LK OUTLET TO N FORK CROW P1
27 15 BUFFALO
OIRI)FFALO LAKE
CO HWY 18 XING r)OWNSTREAM OF DEEP LAKE
11F ALES 2111204
4 0000 FEET DEPTH
‘)O ’10 00F 71 0066S
O TF T I TM F r)FPTI JC ’\ lfl3 T()T rJFL NP-43—’ J PrIOS—I)IS PkOS—ti)T
QQM OF •J—T’)T/ L N TOTAL (JPTHO
TO flay FF r 1 (’/L Mi /L M(/L M’ /L P MG/L
7?/10/ L. 11 0’) .1-’ 7 4.20r’ 0.4 0 0.154 0.310
72/1I/I 15 0 )•73() .‘f fl C. 0 0.126
7?/1?/IQ ? 25 7,L.Ř(I 0.’ 60 0.094 0.132
71/01/20 12 00 i•7 ) .10 C.L61) C.10 ’ 0.135
71/0?/ q }2 45 .3). ‘.300 0.’-80 0.126 0.160
73/03/10 11 U 3.r ’O ?. ‘“j .92c 0.210 0.360
1/04/0 I’ ‘)O 2 7f)n 0.034 0.fl 4 3.230
71/04/?1 (‘.0)u c 7. e’) 0.10 0.032
71/06/li .0l’ ).‘.i0 c.1?i) 0.063 0.145
71/0 /27 16 70 ‘.0 7 ?.1 0 0 u.034 0.170
71 / ’,/I 1? 7 .,.023 0.075 0.160
73/0R/t 1000 ‘ .0 ’6 7. i Ijl ‘.0f’ 0.031 0.160
71/09/25 10 ‘ .6 0.0 4 7•A( ) C. ’H O 0.052 0.220
K V LU KNOWN TO BE LESS
THAN INDICATED
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STOPET RETRIEVAL DATr 7 /J j/3 J
2713C1 LS2713C1
45 10 00.0 093 52 30.0
UNNAMED BUFFALO LK TRIB FROM E
27 iS BUFFALO
T/R JFFALO LAKE
sr HWY 25 RING IN BUFFALO LAKE
1 )EPALES 2111204
4 0000 FEET DEPTH
906?S O Of’)O 00671 00665
OAIE 1IMF fl PTr-l iU? NO3 TOT KJ L “J’-13—N r OSDIS PHOSTOT
FPOM OF J—TOTAL N TOTAL OPTHO
TO DAY FE€T MC /L MG/L MG/L P MG/L p
72/10/14 10 45 0.7 5u (1.10 5 0.048 0.138
7?/11/1 I4 45 t l.15(, I. fl0 0.140 0.048 0.101)
72/12/1° 17 iS 9.460 0.561) 0.147 0.019 o.100
73/01/20 13 ‘ 0 0.56’l 1.200 C.132 0. ?7 0
71/02/19 1? 40 1.090 ?.f’0 ) 1. O0 0.110 0.340
73/03/li) 10 45 ( .51’) 3.600 0.995 0.595 0.820
71/04/Ot 11 50 0.060 0.031 0.04? 0.200
73/04/23 J.’? O l. .70 0.044 0.046 0.140
71/05/13 10 5 0.?40 1.5?0 0.050 0.0 1 0.150
71/05/?? 16 35 0.1 0 1. 60u 0.04R 0.190
71/06/17 l 05 0.6-) 1 . 90 lj )3Ř 0.100 0.195
73/OR/16 oq 5 0.560 J.115 0.070 0.170
71/09/25 10 30 ‘ i.360 ) .46tj 0.1)4? 0.595
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STO ET RETRIEVAL DATE 74/IC/30
00610
271351 TF271351 P003275
45 10 30.0 093 53 30.0
BUFFALO
27 15 BUFFALO
D#’BUFFALO LAKE
BUFFALO LAKE
I1EPALES 2141204
4 0000 FEET DEPTH
00671
00665
00630
00625
50051
50053
DATE
TIME
DE TH
NO’ NO3
TOT KJEL
NH3—N
Pi-IOS—DIS
PHOS-TOT
FLOW
CONDUIT
FROM
OF
N—TOTAL
N
TOTAL
ORTHO
RATE
FLOW—MGD
TO
DAY
FEET
M(;/L
lG/L
MG/L
M( /L P
MG/L P
INST ‘.IGD
MONTHLY
73/01/23
10
30
6.500
11. 00
0.700
7.100
7.750
0.373
0.391
73/02/OP
10
30
CP(T)—
6.200
13.000
0.610
4.300
8.100
0.400
0.387
73/02/08
1?
10
73/01/26
15
30
3.10’)
15.400
4.000
7.300
9.100
0.460
0.378
71/04/05
10
30
1.900
.4OO
0.169
6.206
6.900
0.435
0.430
71/05/2w
10
30
1 ’.3 00
1. 00
0.155
5.000
6.000
0.560
0.500
73/ )6/l ’
10
10
CP(T)—
13.000
4.900
1.199
5.800
7.400
0.45?
0.450
73/0 /1?
13
00
71/07/16
08
00
CP(T)—
1 .400
?. 0O
0.220
B.000
10.000
0.376
0.405
73/07/17
08
00
71/0 /L7
14
00
16.40A
3.800
0.520
7.680
10.500
0.397
0.380
7i/)9/1
00
00
CP(T)—
0.640
3.1’)O
0.470
7.830
8.850
0.391
0.410
71/09/1R
74
00
71/10/2?
08
00
CP(T)—
14.600
3.700
0.008
7.400
10.000
0.4 3
0.460
71/10/?3
08
00
73/11/IP
10
00
CP(T)—
10.400
3.900
0.280
6.400
8.300
0.381
0.390
71/11/19
1?
00
71/12/17
11
00
CP(T)—
16.400
5.’OO
O.?55
6.650
8.800
0.420
0.409
73/12/17
14
00
74/01/2?
08
00
CP(T)—
10.100
‘2.000
0.?80
9.500
11.500
0.370
0.382
74/01/23
38
00
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