U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
WILSON ESERVOIR
ELM COUNTY
NEVADA
EPA REGION IX
WORKING PAPER No, 816
CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
-------
REPORT
ON
WILSON RESERVOIR
ELM3COIMTY
NEVADA
EPA REGION IX
WORKING PAPER No, 816
WITH THE COOPERATION OF THE
NEVADA ENVIRONMENTAL PROTECTION SERVICE
AND THE
NEVADA NATIONAL GUARD
SEPTEMBER., 1977
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REPORT ON WILSON RESERVOIR
ELKO COUNTY, NEVADA
EPA REGION IX
by
National Eutrophication Survey
Water and Land Quality Branch
Monitoring Operations Division
Environmental Monitoring & Support Laboratory
Las Vegas, Nevada
and
Special Studies Branch
Con/all is Environmental Research Laboratory
Corvallis, Oregon
Working Paper No. 816
OFFICE OF RESEARCH AND DEVELOPMENT
U.S. ENVIRONMENTAL PROTECTION AGENCY
September 1977
-------
CONTENTS
Page
Foreword ii
List of Nevada Study Lakes iv
Lake and Drainage Area Map v
Sections
I. Conclusions 1
II. Lake and Drainage Basin Characteristics 4
III. Lake Water Quality Summary 6
IV. Nutrient Loadings 12
V. Literature Reviewed 17
VI. Appendices 18
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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, concen-
trations, 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 nonpoint source pollution abatement in lake water-
sheds.
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
watershed data collected from the study lake and its drainage
basin is documented. The report is formatted to provide state
environmental agencies with specific information for basin
planning [§303(e)], water quality criteria/standards review
[§303(c)], clean lakes [§314(a,b)], and water quality monitoring
[§106 and §305(b)] activities mandated by the Federal Water
Pollution Control Act Amendments of 1972.
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111
Beyond the single lake analysis, broader based correlations
between nutrient concentrations (and loading) and trophic
condition 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 the U.S. Environmental Protection Agency and to augment
plans implementation by the States.
ACKNOWLEDGMENTS
The staff of the National Eutrophication Survey (Office
of Research and Development, U.S. Environmental Protection
Agency) expresses sincere appreciation to the Nevada State
Environmental Protection Service for professional involvement,
to the Nevada National Guard for conducting the tributary
sampling phase of the Survey, and to those Nevada wastewater
treatment plant operators who provided effluent samples and
flow data.
The staff of the Department of Conservation and Natural
Resources, Division of Environmental Protection, State Environmental
Protection Service 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 Floyd L. Edsall, the Adjutant General of
Nevada, and Project Officer Major Harold E. Roberts, who directed
the volunteer efforts of the Nevada National Guardsmen, are
also gratefully acknowledged for their assistance to the Survey.
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IV
NATIONAL EUTROPHICATION SURVEY
STUDY LAKES
STATE OF NEVADA
LAKE NAME
Lake Mead
Lahontan Reservoir
Rye Patch Reservoir
Lake Tahoe
Topaz Reservoir
Upper Pahranagat Lake
Washoe Lake
Wildhorse Reservoir
Wilson Reservoir
Walker Lake
COUNTY
Clark (Mohave in Arizona)
Lyon, Churchill
Pershing
Washoe, Carson City,
Douglas (Placer,
El Dorado in CA)
Douglas (Mono in CA)
Lincoln
Washoe
Elko
Elko
Mineral
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WILSON RESERVOIR!
0 Tributary Sampling Site!
X Lake Sampling Site!
5 10 Km.'
WILSON
RESERVOIR
41'45'-
41*40'
41'35'—
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REPORT ON WILSON RESERVOIR, NEVADA
STORE! NO. 3210
I. CONCLUSIONS
A. Trophic Condition:*
Survey data indicate that Wilson Reservoir is eutrophic,
i.e., nutrient rich and highly productive. Whether such nutrient
enrichment is to be considered beneficial or deleterious is
determined by its actual or potential impact upon designated
beneficial water uses of the lake.
Chlorophyll a^ values in the lake ranged from 1.6 yg/1 to
42.6 ug/1 with a mean of 10.0 yg/1. The potential for primary
productivity as measured by algal assay control yields was high.
Secchi disc visibility was reported to be the entire depth of
the lake in summer and fall, but spring runoff and snow melt
resulted in high sediment-related turbidity during June sampling.
Of the 10 Nevada lakes sampled in 1975, 7 had higher median
total phosphorus levels (0.049 mg/1), 6 had higher median inor-
ganic nitrogen values (0.120 mg/1), and 7 had higher median
orthophosphorus levels (0.016 mg/1) than Wilson Reservoir.
Survey limnologists reported algal blooms during June
sampling, and that the lake was filled with water hyacinths
during July.
*See Appendix E.
-------
B. Rate-Limiting Nutrient:
The algal assay results indicate that Wilson Reservoir was
limited by available phosphorus. The reservoir data suggest primary
limitation by nitrogen.
C. Nutrient Controllability:
1. Point sources -
There were no known point sources impacting Wilson Reser-
voir during the sampling year.
The calculated annual phosphorus loading of 0.21 g P/m^/yr
is greater than that proposed by Vollenweider (1975) as "eutrophic"
for a lake with the same mean depth and hydraulic retention time.
Unless nonpoint nutrient loading can be reduced through modified
land management, Wilson Reservoir can be expected to continue
to deteriorate in water quality.
2. Nonpoint sources -
Wilson Creek contributed 79.3% of the total phosphorus
load to Wilson Reservoir during the sampling year and ungaged
tributaries contributed an estimated 12.1%.
It should be noted that estimations of annual nutrient
loadings contributed by septic tanks around Wilson Reservoir
may be substantially underestimated. Those U.S. Geological
Survey (USGS) quadrangles used for determining the number of
shoreline residences located within 100 meters of the lake
were dated in the 1960's. Thus, the present number of septic
-------
tanks in the area is not known; neither has it been ascer-
tained if those outside the 100 meter limit (U.S. EPA, 1975)
do contribute nutrients to the lake as has been suggested
(F. Luchetti, Personal Communication). Additional study to
obtain a more accurate picture of the nutrient budget for
Wilson Reservoir is recommended.
-------
II. LAKE AND DRAINAGE BASIN CHARACTERISTICS
Lake and drainage basin characteristics are itemized below.
Lake morphometry data were provided by James B. Wilson, Jr.
(personal communication). Tributary flow data were provided by
the Nevada District Office of the U.Si Geological Survey. Outlet
drainage area includes the lake surface area. Tributary B-l is an
outlet which does not have regular water flow. The difference
between inflow and outflow to the lake is due to water diversion
for irrigational purposes. Mean hydraulic retention time was
obtained by dividing the lake volume by mean flow of the outlet.
Precipitation values are estimated by methods as outlined in
National Eutrophication Survey (NES) Working Paper No. 175. A
table of metric/English conversions is included as Appendix A.
A. Lake Morphometry:
1. Surface area: 3.35 km2.
2. Mean depth: 3.9 meters.
3. Maximum depth: 7.6 meters.
4. Volume: 12.912 x 10& m3.
5. Mean hydraulic retention time: 1,868 days (5.1 yrs)
-------
B. Tributary and Outlet:
(See Appendix B for flow data)
1 . Tributaries -
Drainage Mean Flow
Name area (km?) (
B-2 Wilson Creek 208.8 0.26
Minor tributaries and
immediate drainage - 28.8 0.01
Total 237.6 0.27
2. Outlets - A- 1 Unnamed Stream 240.9 0.08
C. Precipitation:
1. Year of sampling: 39.1 cm.
2. Mean annual : 37.4 cm.
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III. LAKE WATER QUALITY SUMMARY
Wilson Reservoir was sampled three times during the open-water
season of 1975 by means of a pontoon-equipped Huey helicopter. Each
time, samples for physical and chemical parameters were collected
from three stations on the lake and from a number of depths at each
station (see map, pagev). During the last two sampling dates, depth-
integrated samples were collected from each station for chlorophyll
a_ analysis and phytoplankton identification and enumeration. During
the first and last visits, 18.9-liter depth-integrated samples were
composited for algal assays. Maximum depths sampled were 7.0 meters
at Station 01, 2.4 meters at Station 02, and 8.2 meters at Station 03.
For a more detailed explanation of NES methods, see NES Working Paper
No. 175.
The results obtained are presented in full in Appendix C and
are summarized in III-A for waters at the surface and at the maximum
depth for each site. Results of the phytoplankton counts and chloro-
phyll ^determinations are included in III-B. Results of the limiting
nutrient study are presented in III-C.
-------
STQr?ET CODE 3
PARAMFTF.S
TEMPERATUPE (OEG
O.-l.S w DEPTH
MAX DEPTHso
DISSOLVED OXYGEN ("G/D
O.-l.S » DEPTH
MAX
°-YSICAL
1/75 )
CONDUCTIVITY (I
O.-l. 5 M DEPTH
MAX OEPTH»°
PH (STANDARD UNITS)
O.-l .5 M DEPTH
MAX DEPTH«»
TOTAL ALKALINITY (M(V/L)
O.-l.S M nEPTH
MAX DEPTH**
TOTAL P (MG/L)
O.-l.S M DEPTH
MAX
DISSOLVED ORTHO P
O.-l.S M DEPTH
MAX DEPTHS*
N02+N03 (MG/L)
n.-l.S M OEPTH
MAX DEPTH***
AMMONIA (MQ/L)
O.-l.S M DEPTH
MAX OEPTH»»
KJELDAHL N (MG/L)
O.-l. 5 M OEPTH
MAX OEPTH«*
SECCHI
CHEMICAL CHARACTERISTICS
( ft/ 1/75 )
MAX
( ll/ 6/75 )
MAX
Njc
7
3
)
7
1
7
3
7
3
.)
7
3
7
3
'L>
7
3
7
3
7
3
7
3
T
5000
QANGE
9.0- 14.5
S.I- 11.2
9.6- 11.1
9.4- 10.5
84.- 100.
80.- 100.
7.0- 10.0
8.4- 10.0
65.- 82.
64.- 78.
0.107-0.149
0.115-0.133
0.027-0.043
0.027-0.077
O.?60-0.420
0.260-0.480
0.040-0.060
0.040-0.120
0.200-0.800
0.200-0.300
n . i - n . ?
= -5
MEDIAN
12.5
9.0
10.5
9.8
inn.
Rft.
in.o
10.0
71.
70.
0.1?fc>
0.1?9
0.033
0.040
0.35U
0.4?0
0.0C0
0.060
0.400
0.300
0. 1
OE^TH
QAI'IGE
f^ETE
0.0-
0.9-
n.o-
0.9-
0.0-
0.9-
0.0-
n.9-
0.0-
0.9-
0.0-
0.9-
0.0-
0.9-
0.0-
0.9-
0.0-
0.9-
0.0-
0.9-
*S)
1.2
7.6
1.2
7.6
1.2
7.6
1.2
7.6
1.2
7.6
1.2
7.6
1.2
7.6
1.2
7.6
1.2
7.6
1.2
7.6
N«*
3
3
3
1
3
3
3
1
3
1
3
1
3
1
3
1
3
1
3
1
1
5000
xANGE
22.5- 22.6
14.3- 20.0
7.2- 9.4
3.6- 3.6
10.- 12.
10.- 15.
8.9- 9.6
6.2- 8.2
63.- 79.
84.- 84.
0.018-0.027
0.027-0.027
0.006-0.011
0.008-0.008
0.020-0.020
0.080-0.080
0.020-0.030
0.040-0.040
0.500-0.500
0.400-0.400
is.?- m.?
= 3
MEDIAN
22.5
16.5
9.0
3.6
11.
12.
9.4
8.2
64.
84.
0.020
0.027
0.007
0.008
0.020
0.080
0.030
0.040
0.500
0.400
IS.?
DEPTH
xANGF
(METERS) NS
0.0-
2.4-
0.0-
8.2-
0.0-
2.4-
0.0-
8.2-
0.0-
8.2-
0.0-
8.2-
0.0-
8.2-
0.0-
8.2-
0.0-
8.2-
0.0-
8.2-
0.0
8.2
0.0
8.2
0.0
8.2
0.0
8.2
0.0
8.2
0.0
8.2
0.0
8.2
0.0
8.2
0.0
8.2
0.0
8.2
6
3
5
3
6
3
6
3
6
3
6
3
6
3
6
3
b
3
6
3
n
9000
RANGE
5.7- 6.?
5.7- 6.2
9.0- 10.4
9.0- 9.4
131.- 170.
130.- 137.
7.6- 8.«
8.5- 8.7
68.- 85.
70.- 72.
0.032-0.099
0.031-0.099
0.011-0.064
0.012-0.023
0.020-0.430
0.020-0.030
0.020-0.100
0.020-0.030
0.200-0.900
0.200-0.900
ooooo-ooooo
= 3
MEOI AM
5.7
5.8
9.2
9.2
131.
134.
8.6
8.7
72.
72.
0.047
0.045
0.015
0.014
0.025
0.020
0.030
0.030
0.250
0.200
00000
OEPTH
RANGE
(METERS)
0.0-
1.5-
0.0-
1.5-
0.0-
1.5-
0.0-
1.5-
0.0-
1.5-
0.0-
1.5-
0.0-
1.5-
0.0-
1.5-
0.0-
1.5-
0.0-
1.5-
1.5
7.0
1.5
7.0
1.5
7.0
1.5
7.0
1.5
7.0
1.5
7.0
1.5
7.0
1.5
7.0
1.5
7.0
1.5
7.0
« N = NO. OF SAMPLES
»« MAXIMUM DEPTH SAMPLED AT EACH SITE
»*« s = MO. OF SITES SAMPLED ON THIS
-------
B. Biological Characteristics:
1. Phytoplankton -
Sampling
Date
05/31/75
08/01/75
11/06/75
Dominant
Genera
1. Cryptomonas
2. Chroomonas?
3. Nitzschia
4. Synedra
Other genera
Total
1. Flagellates
2. Gymnodinium
3. Tetraedron
4. Scenedesmus
Other genera
Total
1. Pennate diatom
2. Fragilaria
3. Chroomonas?
4. Aphanizomenon
5. Epithemia
Other genera
Total
Algal
Units
Per ml
1,609
623
260
52
2,544
210
84
42
42
378
446
377
343
137
69
207
1,579
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2. Chlorophyll a_ -
Sampling Station Chlorophyll a_
Date Number (yig/1)
08/01/75 01 6.7
02 1.6
03 2.6
11/06/75 01 3.7
02 42.6
03 3.0
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10
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/l-dry wt.)
a. 05/30/75
Control 0.026 0.375 10.0
0.05 P 0.076 0.375 16.4
0.05 P + 1.0 N 0.076 1.375 29.5
1.00 N 0.026 1.375 10.6
b. 11/06/75
Control 0.015 0.120 1.6
0.05 P 0.065 0.120 7.0
0.05 P + 1.0 N 0.065 1.120 13.6
1.00 N 0.015 1.120 1.2
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11
2. Discussion -
The control yields of the assay alga, Selenastrum capri-
cornutum*, indicate that the potential for primary productivity in
Wilson Reservoir was high during both sample collection times
(05/30/75, 11/06/75). In both assays, the addition of phosphorus
alone and in combination with nitrogen produced a significant
increase in yield over that of the control, indicating phosphorus
limitation. Spikes of nitrogen alone did not stimulate growth
significantly beyond control yields.
The mean inorganic nitrogen to orthophosphorus ratios (N/P)
in the lake data of 11/1, 7/1, nad 6/1 in the spring, summer, and
fall, respectively, suggest primary limitation by nitrogen (a mean
N/P ratio of 14/1 or greater generally reflects phosphorus limi-
tation).
*For further information regarding the algal assay test procedure
and selection of test organisms, see U.S. EPA (1971).
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12
IV. NUTRIENT LOADINGS
(See Appendix D for data)
For the determination of nutrient loadings, the Nevada National
Guard collected monthly near-surface grab samples from each of the
tributary sites indicated on the map (pagev), except for the high
runoff months of April, May and June when two samples were collected
at some stations. Sampling was begun in November 1974, and was com-
pleted in October 1975.
Through an interagency agreement, stream flow estimates for the
year of sampling and a "normalized" or average year were provided
by the Nevada District Office of the USGS for the tributary sites
nearest the lake.
In this report, nutrient loads for sampled tributaries were
determined by using a modification of a USGS computer program for
calculating stream loadings. Nutrient loads indicated for tribu-
taries are those measured minus known point source loads, if any.
Nutrient loadings for unsampled "minor tributaries and immediate
drainage" ("II" of USGS) were estimated by using the mean annual
nutrient loads, in kg/km^/year, in Wilson Creek at Station B-2 and
2
multiplying the means by the II area in km .
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13
A. Waste Sources:
1. Known municipal - None
2. Known industrial - None
B. Annual Total Phosphorus Loading - Average Year
1, Inputs -
% of
Source kg P/yr total
a. Tributaries (nonpoint load) -
B-2 Wilson Creek 555 79.3
b. Minor tributaries and immediate
drainage (nonpoint load) - 85 12.1
c. Known municipal STP's - None
d. Septic tanks* - <5 <0.1
e. Known industrial - None
f. Direct precipitation** - 60 8.6
Total 700 100.0%
2. Outputs - A-l Unnamed Stream 700
3. Net annual P accumulation - —
*Estimate based on one lakeshore residence (see nutrient control-
lability, page 2).
**Estimated (See NES Working Paper No. 175).
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14
C. Annual Total Nitrogen Loading - Average Year:
1. Inputs -
% of
Source kg N/yr total
a. Tributaries (nonpoint load) -
B-2 Wilson Creek 6,060 57.6
b. Minor tributaries and immediate
drainage (nonpoint load) - 835 7.9
c. Known municipal STP's - None
d. Septic tanks* - 10 0.1
e. Known industrial - None
f. Direct precipitation** - 3,615 34.4
Total 10,520 100.0%
2. Outputs - A-l Unnamed Stream 15,490
3. Net annual N export*** - 4,970
*Estimate based on one lakeshore residence (see nutrient control-
lability, page 2).
**Estimated (See NES Working Paper No. 175).
***Export probably due to unknown sources and/or sampling error.
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15
D. Mean Annual Nonpoint Nutrient Export by Subdrainage Area:
2 2
Tributary . kg P/km /yr kg N/km /yr
Wilson Creek 3 29
E. Mean Annual Nutrient Concentrations in Ungaged Streams:
Mean Total P Mean Total N
Tributary (mg/1) (mg/1)
C-l Columbia Creek 0.063 0.600
D-l Bull Creek 0.096 0.924
1-E Deep Creek* 0.242 1.802
*Special interest stream outside the Wilson Reservoir watershed.
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16
F. Yearly Loadings:
In the following table, the existing phosphorus annual loading
is compared to the relationship proposed by Vollenweider (1975).
Essentially, his "eutrophic" loading is that at which the receiving
waters would become eutrophic or remain eutrophic; his "oligotrophic"
loading is that which would result in the receiving water remaining
oligotrophic if morphometry permitted. A "mesotrophic" loading
would be considered one between "eutrophic" nad "oligotrophic".
Note that Vollenweider's model may not apply to lakes with
short hydraulic retention times or in which light penetration is
severely restricted by high concentrations of suspended solids
in the surface waters.
Total Yearly
Phosphorus Loading
(9/m?/yr)
Estimated loading for Wilson Reservoir 0.21
Vollenweider's "eutrophic" loading 0.15
Vollenweider's "oligotrophic" loading 0.08
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17
V. LITERATURE REVIEWED
Luchetti, F. 1977. Personal communication (septic tanks). Nevada
Environmental Protection Service, Carson City, Nevada.
U.S. Environmental Protection Agency. 1971. Algal Assay Procedure
Bottle Test. National Eutrophication Research Program, Corvallis,
Oregon.
U.S. Environmental Protection Agency. 1975. National Eutrophica-
tion Survey Methods 1973-1976. Working Paper No. 175. National
Environmental Research Center, Las Vegas, Nevada, and Pacific
Northwest Environmental Research Laboratory, Corvallis, Oregon.
Vollenweider, R. A. 1975. Input-Output Models With Special
Reference to the Phosphorus Loading Concept in Limnology.
Schweiz. Z. Hydro!. 37:53-84.
Williams, James B. 1974. Personal communication (lake morphometry),
Department of Human Resources, Carson City, Nevada.
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18
VI. APPENDICES
APPENDIX A
CONVERSION FACTORS
-------
CONVERSION FACTORS
Hectares x 2.471 = acres
Kilometers x 0.6211 = 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/squarc mile
-------
APPENDIX B
TRIBUTARY FLOW DATA
-------
TRIBUTARY FLO* INFORMATION FOR NEVADA
1/21/ r r
LAKE CODE 3310
WILSON RESERVOIR
TOTAL DRAINAGE AREA OF LAKE(SO KM)
SUB-DRAINAGE
TRIBUTARY AREA(S
-------
TRIBUTARY FLOW INFORMATION FOR NEVADA
LAKE CODE 3210
WILSON RESERVOIR
MEAN MONTHLY FLOWS AND DAILY FLOWS
TRIBUTARY MONTH YEAR MEAN FLOW DAY
331062
11
12
1
2
3
4
5
6
7
8
9
10
74
74
75
75
75
75
75
75
75
75
75
75
FLOW DAY
FLOW DAY
FLOW
0.085
0.113
0.198
0.340
0.708
1.133
14.158
5.663
1.416
0.227
0.057
0.085
25
14
la
2?
2?
12
10
7
19
16
n
11
0.085
0.113
0.198
0.396
0.991
0.991 28
14.158 24
8.495 22
0.708
0.255
0.028
0.071
1.699
16.990
2.832
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APPENDIX C
PHYSICAL AND CHEMICAL DATA
-------
STOSliT RETRIEVAL DATE 77/01/26
NATL EUTROPHICATION SURVEY
EPA-LAS VEGAS
321001
41 39 58.0 116 20 08.0 3
WILSON SINK RESERVOIR
32007 NEVADA
/TYPA/AMBNT/LAKE
DATE TIME DEPTH
FROM OF
TO DAY FEET
75/06/01 09 00 0000
09 00 0003
09 00 0004
75/08/01 18 30 0000
18 30 0009
75/11/06 15 00 0000
15 00 0005
15 00 0015
15 00 0023
11EPALES 751216 04001002
0005 FEET DEPTH CLASS 00
00010
WATER
TEMP
CENT
13.5
9.0
9.0
22.5
20.0
5.7
5.7
5.7
5.8
00300
00
MG/L
10.8
9.6
9.8
9.0
9.6
9.0
8.8
9.0
00077
TRANSP
SECCHI
INCHES
8
600
00094
CNDUCTVY
FIELD
MICROMHO
84
84
88
10
10
132
131
131
134
00400
PH
SU
10.00
9.60
10.00
9.40
8.60
8.70
8.60
8.70
00410
T ALK
CAC03
MG/L
74
68
70
63
72
73
75
72
00610
NH3-N
TOTAL
MG/L
0.050
0.050
0.060
0.030
0.030
0.030
0.040
0.030
00625
TOT KJEL
N
MG/L
0.800
0.400
0.300
0.500
0.200K
0.200K
0.200
0.200
00630
N02&N03
N-TOTAL
MG/L
0.300
0.410
0.420
0.020
0.020
0.020
0.020
0.020
00671
PHOS-DIS
ORTHO
MG/L P
0.043
0.040
0.040
0.011
0.016
0.011
0.012
0.012
00665 32217
DATE TIME DEPTH PHOS-TOT CHLRPHYL
FROM OF A
TO DAY FEET MG/L P UG/L
75/06/01 09 00 0000 0.141
09 00 0003 0.126
09 00 0004 0.129
75/08/01 18 30 0000 0.027 6.7
75/11/06 15 00 0000 0.036 3.7
15 00 0005 0.049
15 00 0015 0.029
15 00 0023 0.031
00031
INCDT LT
RFMNING
PERCENT
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 77/01/26
NATL EUTROPHICATIOM SURVEY
EPA-LAS VEGAS
321002
41 40 06.0 116 19 39.0 3
hILSON SINK RESERVOIR
32007 NEVADA
/TYPA/AMBNT/LAKE
DATE TIME DEPTH
FROM OF
TO DAY FEET
75/06/01 09 30 0000
09 30 0003
75/08/01 18 54 0000
18 54 0008
75/11/06 13 20 0000
13 20 0005
11EPALES 751216 04001002
0004 FEET DEPTH CLASS 00
00010
WATER
TEMP
CENT
12.5
11.2
22.6
16.5
5.7
5.7
00300
DO
MG/L
11.0
10.5
9.4
10.4
9.2
00077
TRANSP
«:ECCHl
INCHES
3
600
00094
CNDUCTVY
FIELD
MICROMHO
100
100
11
15
131
137
00400
PH
SU
10.00
10.00
9.60
8.75
8.70
00410
T ALK
CAC03
MG/L
82
78
64
68
72
00610
NH3-N
TOTAL
MG/L
0.040
0.040
0.020
0.020
0.030
00625
TOT KJEL
N
MG/L
0.500
0.200
0.500
0.300
0.900
00630
N028.N03
N-TOTAL
MG/t
0.300
0.260
0.020K
0.020
0.030
00671
PHOS-DIS
ORTHO
MR/L P
0.031
0.027
0.007
0.011
0.023
00665 32217
DATE TIME DEPTH PHOS-TOT CHLRPHYL
FROM OF A
TO DAY FEET MG/L P UG/L
75/06/01 09 30 0000 0.149
09 30 0003 0.115
75/08/01 18 54 0000 0.020 1.6
75/11/06 13 20 0000 0.032 42.6
13 20 0005 0.099
00031
INCDT LT
PFMNING
PERCENT
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STOPET RETRIEVAL DATE 77/01/26
NATL EUTROPhlCATION SURVEY
EPA-LAS VEGAS
321003
41 40 57.0 116 20 41.0 3
KILSON SINK RESERVOIR
32007 NEVADA
/TYPA/AMBNT/LAKE
DATE TIME DEPTH
FRO*1 OF
TO DAY FEET
75/06/01 10 00 0000
10 00 0003
10 00 0010
10 00 0016
10 00 0025
75/08/01 19 05 0000
19 05 0019
19 05 0027
75/11/06 14 45 0000
14 45 0005
14 45 0015
11EPAUES 751216 04001002
0025 FEET DEPTH CLASS 00
00010 00300 00077
WATER DO THANSP CN
TEMP «:ECCHI FIELD
CENT MG/L INCHES MI
14.5
12.6
9.6
7.5
5.1
22.5
19.0
14.3
6.2
6.2
6.2
11.1
10.0
7.1
9.4
7.2
7.0
3.6
9.0
9.4
600
94
TVY
MHO
100
100
92
86
80
12
12
12
170
131
130
00400
PH
SU
7.50
7.00
7.00
8.00
8.40
8.95
9.00
8.20
7.60
8.50
8.55
00410
T ALK
CAC03
MG/L
71
65
64
64
79
77
84
85
70
70
00610
NH3-N
TOTAL
MG/L
0.040
0.050
0.060
0.120
0.030
0.030
0.040
6.100
0.040
0.020
00625
TOT KJEL
N
MG/L
0.300
0.400
0.300
0.300
0.500
0.500
0.400
0.300
0.200
0.200K
00630
N020.N03
N-TOTAL
MG/L
0.350
0.400
0.450
0.400
0.020K
0.020K
0.080
0.220
0.430
0.020
00b71
PHOS-DIS
OPTHO
MR/L P
0.031
0.033
0.037
0.077
0.006
0.006
0.008
6.064
0.015
0.014
DATE TIME DEPTH
FROM OF
TO DAY FEET
75/06/01 10 00 0000
10 00 0003
10 00 0010
10 00 0025
75/08/01 19 05 0000
19 05 0019
19 05 0027
75/11/06 14 45 0000
14 45 0005
14 45 0015
0665
S-TOT
/L P
0.107
0.116
0.145
0.133
0.018
0.025
0.027
0.045
0.051
0.045
32217
CHLRPHYL
A
UG/L
2.6
3.0
00031
IMCOT LT
RFMNING
PFRCENT
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
APPENDIX D
TRIBUTARY AND WASTEWATER
TREATMENT PLANT DATA
-------
- • r VA,_ .j: ft. 7//ul/>2
•: fwC.5.
3210A1
41 40 40.0 116 20 20.0 4
UNfcAMEG STREAM
32 15 WILSON RES
0/talLSON HESErtVOIrt 1307<-»1
8ROG ON OUT RO AT S TIP OF wILSON PES
11EPALES 040010C4
0000 FEET DEPTH CLASS 00
1 1 A T K
FPO"-'
TO
75/Ori/irj
7b/OfS/24
75/06/07
75/C6/??
75/07/19
TI»iE QEPTri
OK
C'tv FEET
1
-------
•-'OT'- J^
LAS tft
04 Tr
F^OM
TO
OEPTU
N-
DAY FEF.T
76/06/33 12 45
V5/nr/l9 1? IS
75/naxih 13 15
75/99/13 14 30
41 39 45.0 lit- 20 bO.O 4
WILSON CHEEK
32 1 b WILSON rtES
0/KlLSON ^ESESVOI^ 130791
6NK SAM END OF DHT RD N» TI^> OF
11EPALES 04001004
oooo FEET DEPTH CLASS oo
00630
?J.M03
TuTAL
MG/L
0.04S
0.00^
0.010
0.010
00635
TOT KJEL
•N
MG/L
1 .050
1.800
1.600
2.200
00610
WH3-N
TOTAL
MG/L
0.020
0.030
0.020
0.0^5
00671
PHOS-OIS
ORTnO
MG/L f*
0.010
0.140
0.200
0.160
00665
OHOS-TOT
MG/L p
0.050
0.230
0.290
0.340
-------
£ I . _- j [„(;._ i £ .\ T 7 j.
r.ci- i. 4t VE'.-.AS
/TV -a/fi .tptv
00630
0a ff" TI^E OEPT^- WO?KN03
F«OM oc M-TOTAL
TO CAY FEtT MG/L
74/11/24
11
75/16/2?
13 45
75/A6/16 11 55
75/09/13 13 15
75/lu/ll 11 25
(1.155
0.035
0.070
0.020
0.005
TOT KjtL
[V
o.^oo
0.400
0.600
0.650
0.150
0.800
0.700
00610
M!->3-N
TOTAL
MG/L
0.0*0
0.0?5
0.020
o.o?o
0.005
0.010
0.005
00671
PHOS-DIS
OWTHO
P
41 39 30.0 116 0« 25.0 <•
COLOMBIA CHEEK
32 15 HULL
SEC PO XING 3.4 Ml
HEPALES
0000 FEET DE^TH
130791
NE OF BULL m
04001004
CLASS 00
CRK
0.005K
0.065
0.005
0.005
0.010
0.005
0.015
00665
PriOS-TOT
MG/L P
0.010K
0.130
0.120
0.030
0.040
0.020
0.040
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
S" :i~r. I -KT~ it.'.- H
,i.rL FUTROPHlCAT
r^ft- LAS VEGA?
3210d2
41 39 20.0 116 18 30.0 4
wlLSON C3EEK
32 IS W1LSO* «ES
T/wILSON RtSERVOIH 1107Q1
BNK SAM FPM JEEP THAIL 1.5 * SE CF «ES
11EPALES 0400100^
ooon FEET OEHTH CLASS op
DATE TlviE 9F"T-
FKO* i""7
TO
74/11/25-
75/04/12
75/04/28
75/U5/10
75/06/07
75/06/22
75/07/ IS
7 5 / '•> H / 1 6
75/09/13
75/10/11
OAY FEET
10
13
12
12
13
12
12
14
12
4->
20
45
on
30
3i>
45
15
27
(I.) h 30 00625
- M02i>,NO3 TOT KJEL
M-TOTAL N
<"G/L
I'l .
.).
0.
0.
0.
it.
0.
0 .
0.
0.
05S
060
77fi
61 CP
140
030
00*
04p
OOS
0^0
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
700
600
650
450
850
750
225
200
700
00610 00671 00665
VH3-N PHOS-PIb PHOS-TOT
TOTAL OHTHO
MG/L
0
0
0
0
0
0
0
0
0
0
,0?0
.040
.020
.015
.015
.037
.024
.010
.005
.010
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
P
010
010
050
045
025
010
017
020
005*
005
MG/L P
0.070
0.030
0.280
0.260
0.130
0.040
0.020
0.04b
0.010
0.010
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
r. t- - - '. a v
/TV
41 3V JO.O 11*>
COLONS I A CHtFK
3<> 15 HULL
3.« MI NE OF * FFtf
74/11/24 ^ nO
7b/«6/n 7
75/06/2'
V5/n7/ 19
75/06/16
75/(>9/n
75/ld/l 1
1 l~
4 4^
3 45
1 5^
3 15
1 25
- >vG?.sN03 TOT rcjtt M«3-i\ .Dli')S
\-— f/lTAl ... "T.iTi ^i-»T
^ T \ •
MT,
^/
ii
0
0
0
0
0
' «l.
/L
.OPi
.loc.
.15=;
.03^
.070
.020
.005
• \
Mr,
c
0
0
n
0
0
0
/L
.40 a
.400
.cOO
.6bO
.150
.yoo
.700
' W '
Mfi
0
0
0
0
0
0
0
/L
.(J4Q
. ,>?5
.020
.Q?0
.015
.010
.005
l.( T 1
i-iG/
0
: 0
0
o
0
0
0
-nis PHOS-TOT
M f\
" -J
L H
.005K
,f>65
.005
.005
.010
.005
.nib
MG/
0
0
0
0
0
0
0
L P.
.01 OK
.130
.120
.030
.040
.020
.040
K VALUC KNOWN TO BE LESS
THAN INDICATED
-------
-cT-it.'-L' ->ATt
IJT- }--.ICAT10N SUKivEY
00630
TI"'E DEPTH N02«,N03
Or N-TOTAL
M6/L
11
10
75/07/19 13
75/08/16 11
75/04/13 13
75/ln/ll 11
SO
30
30
321001
41 37 1S.O 116 07 3S.O 4
PULL f*UN
33 l?> BULL «UM
T/WILSON rtESERVOI-^ 13079?
SEC RO XI^G 4.5 Ml NNE OF OEf° CNEtK
llEPALfc^ 04001004
0000 FEET DEPTi CLASS OQ
00625 C0610 00671
TOT KJfL »tri3-rg
N TOTAL
MG/L MG/L MG/L P
00665
PhOS-TOT
MG/L P
C . 0 0 °.
0.300
0.260
0.1 Qt.
0.005
0.005
0.005
0.010
0.300
0.750
0.800
0.550
2.100
0.300
1.200
0.700
0.015
0.030
0.020
0.020
0.020
0.010
0.015
0.010
0.010
0.045
0.025
0.020
0.020
0.015
0.010
0.015
0.010
0.210
0.2&0
0.100
0.060
0.050
0.020
0.040
-------
.-. L ! ,_
- i-a_
74/11/24
74/12/13
75/ul/lB
75-/03/2?
75/05/10
7S/06/0 7
41 34 00.0 116 OS 35. 0
OEEP C*EEK
3? 15 8ULL PUN
T/mlLSON RESERVOIR
dNK SA^ OFF OPT *0 .3
HtPALES
0000 FEET OEfTn
M fi&nv DEE?
04001004
CLASS no
OF
Q£ '
fhT
7b/10/l
14
1 1
1^
15
11
1?
11
10
1 0
10
12
13
1 1
13
10
as
3 <
01
00
?1
20
51
5b
50
30
01
ID
?6
45
55
00630 0 0 b ? r
M02NMCH TOT *jtiL
N-TuT4L N
•^G/L MG/L
n
0
0
0
0
0
1
1
u
n
0
0
0
0
0
.01*
. 19'
.0?4
.011
.0"^
.75n
,35n
.400
,-)3n
. 7 (i n
.301
.290
.00^
.00^
.010
n
1
0
0
5
1
2
1
2
1
1
2
0
0
1
.P0!t
.300
.^00
.650
.101
.150
.000
.101)
.?oi
.lor.
.001
.4(jO
.^0
,70u
. 0 0 0
OQf 10 00671 OO^bS
Nin3~M PHOS-OIS DHOS-TOT
MG/L VG/L P MG/L P
n
0
0
0
0
0
0
0
0
0
0
0
0
0
0
.030
.O.'O
. o 1:6
.140
.^30
. 035
.05.0
. i'l 4 b
. 0?b
.Olb
.020
,0«-i)
.((ObK
.005
.rinaK
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
*
•
•
•
•
•
•
•
•
•
•
•
•
•
•
045
055
065
005
1H5
130
135
1JO
085
090
075
080
065
070
060
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
05(1
070
070
060
240
60ft
880
170
650
350
110
100
090
090
090
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
APPENDIX E
PARAMETRIC RANKINGS OF LAKES
SAMPLED BY NES IN 1975
STATE OF NEVADA
Mean or median values for six of the key parameters evaluated
in establishing the trophic conditions of Nevada lakes sampled are
presented to allow direct comparison of the ranking, by parameter,
of each lake relative to the others. Median total phosphorus, median
inorganic nitrogen and median dissolved orthophosphorus levels are
expressed in mg/1. Chlorophyll a_ values are expressed in yg/1. To
maintain consistent rank order with the preceding parameters, the
mean Secchi disc depth, in inches, is subtracted from 500. Similarly,
minimum dissolved oxygen values are subtracted from 15 to create
table entries.
-------
LAKE DATA TO BE USED' IN RANKINGS
LAKE
CODE LAKE NAME
3201 LAKE ?'EAD
3202 LAHOMTA.N RESERVOIR
3204 RYE PATCH RESERVOIR
3205 LAKE TAHOE
3205 TOPAZ RESERVOIR
3207 UPPER PAHRANGAT LAKE
3203 WASHOE LAKE
3209 WILD HORSE RESERVOIR
3210 .WILSON RESERVOIR
3211 WALTER LAKE
MEDIAN '
TOTAL P
0.016
0.193
0.094
0.005
0.057
0.173
0.403
0.114
0.049
0.602
MEDIAN
INORG N
0.340
0.350
0.050
0.040
0.165
0.125
0.130
0.320
0.120
0.080
500-
MEAN SEC
266.565
472.083
467.750
-3.269
376.000
470.000
494.555
439.400
197.333
405.333
MEAN
CHLORA
3.111
4.608
4.933
0.571
7.517
—
11.633
75.530
10.033
3.422
15-
HIN DO
11.400
10.400
10.000
10.200
14.600
3.600
7.200
14.600
11.400
15.000
TIED I AN
DISS ORTHO F
0.005
0.14S
0.039
0.003
0.041
0.026
0.263
0.065
0.016
0.574
-------
PERCENT OF LAKES WITH HIGHER VALUES (NUMBER OF LAKES WITH HIGHER VALUES)
LAKE
CODE LAKE. NAME.
3201 LAKE *1EAD
3202 LAHON7AN RESERVOIR
3204 RYE PATCH RESERVOIR
3205 LAKE TAHOE
3206 TOPAZ RESERVOIR
.3207 UPPER PAHRANAGAT LAKE
3208 WASHOE LAKE
3209 WILD HORSE RESERVOIR
3210 WILSON RESERVOIR
3211 WALKER LAKE
MEDIAN
TOTAL P
89 (
22 (
56 (
100 (
67 (
33 (
11 (
44 (
73 (
0 (
8)
2)
5)
9)
6}
3)
1)
4}
7)
0)
MEDIAN
INQRG
11 (
0 (
89 (
100 (
33 (
56 (
44 (
22 (.
67. (
78 (
N
1)
0)
8)
9)
3)
5)
4}
2)
6)
7)
500-
MEAN SEC
78 (
22 J
44 (
100 (
67 (
33 (
0 (
11 (
89 (
56 (
7)
2)
4)
9)
6)
3)
0)
1)
8)
5)
MEAN
CHLORA
88 (
63 (
50 (
100 (
38 (
13 (
0 (
25 {
75 (
7)
5)
4)
8)
3)
1)
0)
2)
6)
15-
MIN 00
39 (
56 C
78 (
67 (
17 (
89 (
100 C
17 (
39 (
0 (
3)
5)
7)
6)
1)
3)
9)
1)
3)
0)
MEDIAN
DISS ORTHO f
89 (
22 (
56 (
100 (
44 (
67 (
11 (
33 (
78 (
0 C
8)
2)
•5}
9)
4)
6)
1)
3}
?)
0)
------- |