U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
TOPAZ LAKE
DOUGLAS COUNTY, NEVADA
mm COUNTY, CALIFORNIA
EPA REGION IX
WORKING PAPER No, 811
CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
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REPORT
ON
TOPAZ LAKE
DOUGLAS COUNTY, NEVADA
MONO COUNTY, CALIFORNIA
EPA REGION IX
WORKING PAPER No, 811
WITH THE COOPERATION OF THE
NEVADA ENVIRONMENTAL PROTECTION SERVICE
AND THE
NEVADA NATIONAL GUARD
SEPTEMBER. 1977
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REPORT ON TOPAZ LAKE
DOUGLAS COUNTY, NEVADA
MONO COUNTY, CALIFORNIA
EPA REGION IX
by
National Eutrophtcation Survey
Water and Land Quality Branch
Monitoring Operations Division
Environmental Monitoring & Support Laboratory
Las Vegas, Nevada
and
Special Studies Branch
Corvallis Environmental Research Laboratory
Corvallis, Oregon
Working Paper No. 811
OFFICE OF RESEARCH AND DEVELOPMENT
U.S. ENVIRONMENTAL PROTECTION AGENCY
September 1977
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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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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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Hi
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, the California State Water
Resources Control Board and the California Regional Water Quality
Control Board for professional involvement, to the Nevada and
California National Guards for conducting the tributary sampling
phase of the Survey, and to those Nevada and California
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, Nevada
Environmental Protection Service, and the staffs of the Division of
Planning and Research of the California Water Resources Control
Board and the Regional Water Quality Control Board, 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, and
Major General Glen C. Ames, the Adjutant General of California, and
Project Officer Second Lieutenant Terry L. Barrie, who directed
the volunteer efforts of the California 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
Lahpntan 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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TOPAZ LAKE
\
TOPAZ LAKE
® Tributary Sampling Site
X Lake Sampling Site
o 5 10 is Km.
21/2 5
Scale
71/2 Mi.
\ 38° 30'-
\
\
Map Location
38°15'-
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REPORT ON TOPAZ LAKE, NEVADA
STORET NO, 3206
I. CONCLUSIONS
A. Trophic Condition:*
Survey data indicate that Topaz Lake 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 3.2 yg/1
in March to 11.1 yg/1 in November with a mean of 7.5 yg/1.
The potential for primary productivity as measured by algal
assay control yields was high. Marked depression of dis-
solved oxygen occurred throughout the lake in the hypolimnion
in November. Of the 10 Nevada lakes sampled in 1975, 6 had
higher median total phosphorus levels (0.057 mg/1), 3 had
higher median inorganic nitrogen values (0.165 mg/1), and
4 had higher median orthophosphorus levels (0.041 mg/1) than
Topaz Lake.
Survey limnologists did not report any problem algal
blooms or macrophytes on their visits to the lake.
*See Appendix E.
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B. Rate-Limiting Nutrient:
Algal assay results indicate Topaz Lake was limited by avail-
able nitrogen. The mean inorganic nitrogen to orthophosphorus
(N/P) ratios in the lake data of 7/1 or less on each sampling
occasion also suggest primary limitation by nitrogen.
C. Nutrient Controllability:
1. Point sources -
There were no known point sources impacting Topaz Lake
during the sampling year.
2
The present phosphorus loading of 1.36 g P/m /yr is
greater than that proposed by Vollenweider as "eutrophic".
The Carson River Basin Council of Governments (1974) reports
that agricultural return flow from irrigated areas is a
major cause of water quality deterioration in the Walker
River Basin. A closer examination of agricultural practices
in the Topaz Lake drainage area may provide answers to
nutrient reductions.
2. Nonpoint sources -
Unnamed Canal (B-l) contributed 97% of the total phos-
phorus load to the lake during the sampling year. Water for
the canal is diverted from the Walker River; however, actual
contributions from the canal may be somewhat less than in-
dicated since it is not known how much water is removed from
Unnamed Canal via the West Walker River.
-------
It should be noted that estimations of annual nutrient
loadings contributed by septic tanks around Topaz Lake 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 1950's. Thus the present number of
septic tanks in the area in not known; neither has it been
ascertained if those outside the 100 meter unit (U.S. EPA,
1975) do contribute nutrients to the lake as has been sug-
gested (F. Luchetti, personal communication). Additional
study to obtain a more accurate picture of the nutrient
budget for Topaz Lake is recommended.
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II. LAKE AND DRAINAGE BASIN CHARACTERISTICS
Lake and drainage basin characteristics are itemized below.
Lake morphometry data were provided by James B. Williams, Jr.
(personal communication). Tributary flow data were provided by
the Nevada District Office of the U.S. Geological Survey.
Outlet drainage area includes the lake surface area. The drainage
area and flow of the Walker River is included in the drainage area
of Topaz Canal (A-l) and Unnamed Canal (B-l) . 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:
2
1. Surface area: 9.71 km .
2. Mean depth: 15.8 meters.
3. Maximum depth: 28.0 meters.
4. Volume: 154.418 x 106 m3.
5. Mean hydraulic retention time: 264 days.
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B. Tributary and Outlet:
(See Appendix B for flow data)
1. Tributaries -
Drainage Mean Flow
Name area (km2) (m3/sec)
B-l Unnamed Canal 1,048.9 6.75
Minor tributaries and
immediate drainage - 21.4 0.06
Total 1,070.3 6.81
2. Outlet - A-l Topaz Canal 1,080.0 6.77
C. Precipitation:
1. Year of sampling: 26.0 cm.
2. Mean annual: 21.6 cm.
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III. LAKE WATER QUALITY SUMMARY
Topaz Lake 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 two stations on the lake and from a number of
depths at each station (see map, page v). During each visit,
depth-integrated samples were collected from each station for
chlorophyll o_ 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 25.9 meters at Station 01, and
23.8 meters at Station 02. 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 chlorophyll ^determinations are included in III-B.
Results of the limiting nutrient study are presented in III-C.
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TOPA7 RESERVOIR
STORE! CODE 3206
PHYSICAL AND CHEMICAL CHARACTERISTICS
PARAMETER
TEMPERATURE (DEG
O.-l. 5 M DEPTH
"AX DEPTH**
DISSOLVED OXYGEN
O.-l.S M DEPTH
MAX DEPTH**
( 3/19/75
N* RANGE MEDIAN
CENT)
4
2
(MG/L)
4
?-
5.0- 5.4
4.8- 5.1
9.6- 10.0
9.4- 9.6
5.2
4.9
9.7
9.5
MAX
DEPTH
RANGE
(METERS) N*
n.o-
23.8-
0.0-
23.8-
1.5
24.4
1.5
24.4
4
2
4
2
( 7/ 1/75
S**» = 2
RANGE MEDIAN
12.9- 17.4
7.2- 7.2
8.6- 8.B
2.6- 6.0
14.8
7.2
8.7
4.3
MAX
DtPTH
RANGE
(METERS)
0.0-
15.2-
0.0-
15.2-
1.5
25.9
1.5
25.9
N*
4
2
4
2
( ll/ 5/75
S*«» = 2
RANGE MEDIAN
12.3- 12.5
11.4- 11.6
7.6- fl.?
0.4- 0.6
12.4
11.5
7.7
0.5
MAX
DEPTH
RANGE
(METERS)
0.0- 1.5
18.9- 21.0
0.0= 1.5
18.9- 21.0
CONDUCTIVITY (UMHO^)
O.-l.S M DEPTH
MAX DFPTH**
4
2
99.- 101.
100.- 101 .
ion.
101 .
0.0-
23.8-
1.5
24.4
4
2
75.- 100.
112.- 145.
87.
129.
0.0-
15.2-
1.5
25.9
4
2
97.- 101.
101.- 107.
100.
104.
0.0- 1.5
lfl.9- 21.0
PH (STANDARD UNITS)
O.-l.S M DEPTH
MAX DEPTH**
TOTAL ALKALINITY
O.-l.S M DEPTH
MAX DEPTH**
TOTAL P (MG/L)
O.-l .5 M DEPTH
MAX DEPTH'*
DISSOLVED ORTHO P
O.-l.S M DEPTH
MAX DEPTH**
N02+N03 (MG/L)
O.-l. 5 M DEPTH
MAX DEPTH**
AMMONIA (MG/L)
O.-l. 5 M DEPTH
MAX DEPTH**
KJELDAHL N (MG/L)
O.-l.S M DEPTH
MAX DEPTH**
4
?-
(MG/L)
4
2
4
2
(MG/L)
4
2
4
2
4
2
4
2
7.5- 7.9
7.8- 7.9
81.- 86.
83.- 88.
0.054-0.060
0.054-0.060
0.041-0.042
0.041-0.044
0.040-0.040
0.040-0.040
0.220-0.230
0.230-0.230
0.600-1.200
0.500-0.600
7.8
7.8
84.
BA.
0.055
O.OS7
0.041
0.042
0.040
0.040
0.2?0
O.?30
0.650
0.5SO
0.0-
23.8-
0.0-
23.8-
0.0-
23.8-
0.0-
23.8-
0.0-
23.8-
0.0-
23.8-
0.0-
23.8-
1.5
24.4
1.5
24.4
1.5
24.4
1.5
24.4
1.5
24.4
1.5
24.4
1.5
24.4
4
2
4
2
4
2
4
2
4
2
4
2
4
2
6.3- 8.8
7.5- 8.0
47.- 53.
82.- 88.
0.036-0.068
0.085-0.159
0.005-0.015
O.OSQ-0.116
0.020-0.030
0.030-0.050
0.020-0.520
0.190-0.420
0.200-0.500
o. 4oo-o. aoo
8.5
7.8
53.
85.
0.043
0.122
0.007
0.088
0.020
0.040
0.030
0.305
0.350
0.600
0.0-
15.2-
0.0-
15.2-
0.0-
15.2-
0.0-
15.2-
0.0-
15.2-
0.0-
15.2-
0.0-
15.2-
1.5
25.9
1.5
25.9
1.5
25.9
1.5
25.9
1.5
25.9
1.5
25.9
1.5
25.9
4
2
4
2
4
2
4
2
4
2
4
2
4
2
7.6- 7.R
7.3- 7.5
61.- 75.
60.- 71.
0.067-0.086
0.096-0.173
0.037-0.049
O.OH3-0.103
0.020-0.020
0.020-0.020
0.040-0.080
0.160-0.500
0.200-0.200
0.400-0.600
7.7
7.4
69.
66.
0.071
0.134
0.045
0.093
0.020
0.020
0.065
0.330
0.200
0.500
0.0- 1.5
18.9- 21.0
0.0- 1.5
18.9- 21.0
0.0- 1.5
18.9- 21.0
0.0- 1.5
18.9- 21.0
0.0- 1.5
18.9- 21.0
0.0- 1.5
18.9- 21.0
0.0- 1.5
18.9- 21.0
SECCHI DISC (METER<:>
3.4- 4.3
3.8
1.8- 2." 2.1
3.4- 3.7 3.5
N = NO. OF SAMPLES
MAXIMUM DEPTH SAMPLED AT EACH SITE
» s = NO. OF SITES SAMPLED ON THI<: D4TE
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B. Biological Characteristics:
1. Phytoplankton -
Sampling
Date
03/19/75
06/30/75
07/01/75
11/05/75
Dominant
Genera
1. Centric diatom
2. Fragilaria
3. Dictyosphaerium
4. Melosira
5. Chroomonas?
Other genera
Total
1. Fragilaria
2. As ten'one 11 a
3. Chroomonas?
4. Aphanizomenon
5. Cryptomonas
Other genera
Total
1. Fragilaria
2. Aphanizomenon
3. Asterionella
4. Chroomonas?
5. Melosira
Other genera
Total
1. Cryptomonas
2. Fragilaria
3. Staiirastrum
4. Melosira
5. Stephanodiscus
Other genera
Total
Algal
Units
Per ml
198
159
119
119
79
39
713
5,059
670
335
274
30
32_
6,400
4,766
801
521
320
160
80
6,648
224
112
112
56
19
37
560
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2. Chlorophyll a_ -
Sampling Station Chlorophyll a_
Date Number (yg/1)
03/19/75 01 3.2
02 3.3
06/30/75 01 9.4
02 8.5
11/05/75 01 9.6
02 11.1
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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/1-dry wt.)
a. 03/19/75
Control 0.035 ' 0.208 " ' ' 1{ 6.4 ' /;
0.05 P 0.085 0.208 7.5
0.05 P •«• 1.0 N 0.085 1.208 25.3
1.00 N 0.035 1.208 11.5
b. 11/05/75
Control 0.055 0.180 8.3
0.05 P 0.105 0.180 8.4
0.05 P + 1.0 N 0.105 1.180 38.4
1.00 N 0.055 1.180 23.2
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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 Topaz Lake was high during the sample collection times
(03/19/75, 11/05/75). In both assays, a significant increase
in yield over that of the control occurred when nitrogen was
added alone and in combination with phosphorus, indicating
nitrogen limitation. Spikes of phosphorus alone did not
stimulate growth significantly beyond control yields.
The mean N/P ratios in the lake data were 7/1 or less on
the three sampling occasions further suggesting primary limi-
tation by nitrogen (a mean N/P ratio of 14/1 or less generally
reflects phosphorus limitation).
*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 (page v)» except for the high
runoff months of April, May, June and July when two samples were
collected. Sampling was begun in November 1974, and was completed
in November 1975.
Through an interagency agreement, stream flow estimates for
the year of sampling and a "normalized" or average year were pro-
vided 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" ("ZZ" of USGS) were estimated by using the
mean annual concentrations in Unnamed Canal, California Creek and
Slinkard Creek at Stations B-l, C-l, and D-l and mean annual ZZ
flow.
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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-l Unnamed Canal 12,825 97.3
b. Minor tributaries and immediate
drainage (nonpoint load) - 185 1.4
c. Known municipal STP's - None
d. Septic tanks* - <5 <0.1
e. Known industrial - None
f. Direct precipitation** - 170 1.3
Total 13,180 100.0%
2. Outputs - A-l Topaz Canal 6,195
3. Net annual P accumulation - 6,985
*Estimate based on 1 lakeshore residence.
**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-l Unnamed Canal 114,020 90.6
b. Minor tributaries and immediate
drainage (nonpoint load) - 1,355 1.1
c. Known municipal STP's - None
d. Septic tanks* - 10 <0.1
e. Known industrial - None
f. Direct precipitation** - 10,485 8.3
Total 125,870 100.0%
2. Outputs - A-l Topaz Canal 195,470
3. Net annual N export*** - 69,600
*Estimate based on 1 lakeshore residence.
**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
Unnamed Canal 12 109
E. Mean Nutrient Concentrations in Ungaged Streams:
Mean Total P Mean Total N
Tributary (mg/1) (mg/1)
C-l California Creek 0.115 0.900
D-l Slinkard Creek 0.123 0.715
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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 or becoming oligotrophic
if morphometry permitted. A "mesotrophic" loading would be
considered one between "eutrophic" and "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/m2/yr)
Estimated loading for Topaz Lake 1.36
Vollenweider's "eutrophic" loading 0.90
Vollenweider's "oligotrophic" loading 0.45
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17
V. LITERATURE REVIEWED
Carson River Basin Council of Governments. 1974. Regional Water
Quality Plan, Phase I, Existing Conditions, Walker River Basin
Carson City, Nevada.
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. Hydrol. 37:53-84.
Williams, James B., Jr. 1974. Personal Communication (lake
morphometry). Department of Human Resources, Carson City, Nevada.
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18
APPENDIX A
CONVERSION FACTORS
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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 motors/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
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APPENDIX B
TRIBUTARY FLOW DATA
-------
TRIBUTARY FLOW INFORMATION FOR NEVADA
1/21/77
LAKE CODE 3206
TOPAZ LAKE
TOTAL DRAINAGE AREA OF LAKFfSQ KM)
1080.0
SUB-DRAINAGE
TRIBUTARY AREA(SQ KM»
JAN
FEB
3206A1
320681
3206ZZ
1080.0
1048.9
31.1
0.93 1.42
3.62 4.98
0.028 0.031
MAR
3.94
0.037
APR
7.02
5.52
0.082
MAY
16.99
17.78
0.161
NORMALIZED FLOWS(CMS)
JUN JUL AUG
21.04
23.70
0.210
15.01
10.51
0.088
8.64
2.35
0.031
SEP
4.73
1.10
0.025
OCT
1.84
1.47
0.017
NOV
?.66
0.020
DEC
MEAN
0.68 6.77
3.34 6.75
0.023 0.063
TOTAL DRAINAGE AREA OF LAKE
SUM OF SUB-DRAINAGE AREAS
1080.0
1080.0
MEAN MONTHLY FLOWS AND DAILY FLOWS(CMS)
TRIBUTARY MONTH YEAR MEAN FLOW DAY FLOW DAY
3206A1
3206B1
11
12
1
2
3
4
5
6
7
8
9
10
11
11
12
1
2
3
4
5
6
7
8
9
10
11
74
74
75
75
75
75
75
75
75
75
75
75
75
74
74
75
75
75
75
75
75
75
75
75
75
75
SUMMARY
TOTAL FLOW IN
TOTAL FLOW OUT
81.74
80.93
FLOW DAY
FLOW
0.850
0.793
0.736
0.680
0.708
0.765
11.327
28.317
19.822
14.158
5.663
2.832
0.0
2.832
2.690
2.690
2.549
2.832
3.115
16.990
39.644
16.990
2.832
3.681
4.248
0.0
IS
16
20
1ft
19
4
7
2
3
2?
3
IS
1*.
20
18
19
4
7
?
1
2?
3
0.906
0.793
0.765
0.623
0.708
0.736
7.079
31.149
22.653
5.663
2.265
2.888
2.662
2.662
2.407
3.030
3.058
8.495
45.307
25.485
4.248
5.663
22
21
30
16
22
21
30
16
0.765
25.485
22.653
18.406
3.256
31.149
28.317
19.822
-------
APPENDIX C
PHYSICAL AND CHEMICAL DATA
-------
STORET RETRIEVAL DATE 77/01/36
NATL EUT90PHICATION SURVEY
EPA-LAS VEGAS
/TYPA/AMBNT/LAKE
00010
DATE
FROM
TO
75/03/19
75/07/01
75/11/05
TIME
OF
DAY
1
1
1
1
1
09
09
09
09
09
09
09
15
15
15
15
15
55
55
55
55
55
50
50
50
50
50
50
50
00
00
00
00
00
DEPTH
FEET
0000
0005
0025
0050
0080
0000
0005
0015
0025
0040
0065
0085
0000
0005
0025
0045
0069
WATER
TEMP
CENT
5
5
5
5
5
17
16
14
12
10
7
7
12
12
12
12
11
.4
.4
.3
.2
.1
.4
.6
.5
.9
.4
.7
.2
.5
.4
.2
.2
.4
330601
36 41 02.0 119 31 58.0 3
TOPAZ RESERVOIR
32005 NEVADA
150191
11EPALES
00300
DO
MG/L
9.8
10.0
9.4
10.0
9.6
8.6
8.6
8.0
7.4
7.0
4.6
2.6
8.2
7.6
7.8
5.8
0.4
00077
TRANSP
SECCHI
INCHES
132
72
144
00094
CNDUCTVY
FIELD
MICROMHO
101
100
101
99
100
100
99
91
91
100
142
145
101
101
99
99
107
0084
00400
PH
SU
7.50
7.65
7.70
7.80
7.80
8.80
8.80
8.40
8.00
7.80
7.60
7.50
7.70
7.80
7.65
7.60
7.30
04001002
FEET DEPTH CLASS
00410
T ALK
CAC03
MG/L
86
84
85
83
83
53
53
53
55
64
87
88
74
75
73
78
71
00610
NH3-N
TOTAL
MG/L
0.230
0.220
ff.220
0.210
0.230
0.030
0.520
0.020
0.040
0.100
0.290
0.420
0.040
0.050
0.060
0.080
0.500
00
00625
TOT KJEL
N
MG/L
1.200
0.600
0.600
0.600
0.500
0.400
0.300
0.300
0.300
0.400
0.600
0.800
0.200
0.200
0.200
0.200
0.600
00630 00671
N02&.N03 PHOS-DIS
N-TOTAL ORTHO
MG/L MG/L P
0.040
0.040
0.040
0.040
0.040
0.020K
0.020K
0.020K
0.020
0.050
0.050
0.030
0.020K
0.020K
0.020K
0.020K
0.020K
0.041
0.041
0.041
0.040
0.041
0.005
0.008
0.008
0.015
0.038
0.079
0.118
0.037
0.043
0.049
0.050
0.103
DATE
FROM
TO
75/03/19
75/07/01
75/11/05
TIME DEPTH
OF
DAY FEET
11 55 0000
11 55 0005
11 55 0025
11 55 0050
11 55 0080
09 50 0000
09 50 0005
09 50 0015
09 50 0025
09 50 0040
09 50 0065
09 50 0085
15 00 0000
15 00 0005
15 00 0025
15 00 0045
15 00 0069
00665 32217
PHOS-TOT CHLRPHYL
A
MG/L P UG/L
0.060 3.2
0.057
0.056
0.054
0.054
0.036 9.4
0.068
0.036
0.042
0.050
0.095
0.159
0.071 9.6
0.067
0.058
0.066
0.173
00031
INCDT LT
REMNING
PERCENT
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 77/01/26
NATL EUTROPHICATION SURVEY
EPA-UAS VEGAS
/TYPA/AMBNT/LAKE
DATE
FROM
TO
75/03/19
75/06/30
75/11/05
TIME
OF
DAY
12 30
12 30
12 30
12 30
12 30
14 20
14 20
14 20
14 20
14 20
15 25
15 25
15 25
15 25
15 25
DEPTH
FEET
0000
0005
0019
0050
0078
0000
0005
0015
0035
0050
0000
0005
0022
0045
0062
00010
*ATER
TEMP
CENT
5.0
5.0
5.0
4.9
4.8
13.1
12.9
12.9
10.4
7.2
12.5
12.3
12.2
12.1
11.6
320603
38 40 18.0 119 32 17.0 3
TOPAZ RESERVOIR
32005 NEVADA
150191
11EPALES
04001002
0082 FEET DEPTH CLASS
00300
DO
M6/L
9.6
9.6
9.4
9.8
9.4
8.8
8.8
7.6
7.4
6.0
7.6
7.8
7.8
4.2
0.6
00077
TRANSP
SECCHI
INCHES
168
96
132
00094
CNDUCTVY
FIELD
MICROMHO
99
99
100
99
101
75
75
79
77
112
97
99
97
99
101
00400
PH
SU
7.90
7.90
7.90
8.00
7.90
8.30
8.30
7.90
7.70
8.00
7.60
7.70
7.60
7.50
7.50
00410
T ALK
CAC03
MG/L
84
81
81
83
88
47
53
54
60
82
63
61
61
59
60
00610
NH3-N
TOTAL
MG/L
0.220
0.220
0.220
0.220
0.230
0.020
0.030
0.060
0.080
0.190
0.080
O.OflO
0.080
0.120
0.160
00
00625
TOT KJEL
M
MG/L
0.700
0.600
0.600
0.600
0.600
0.500
0.200
0.200
0.300
0.400
0.200
0.200
0.200
0.200
0.400
00630 00671
N02&N03 PHOS-DIS
N-TOTAL OPTHO
MG/L MG/L P
0.040
0.040
0.040
0.040
0.040
0.020K
0.030
0.020
0.030
0.050
0.020
0.020
0.020
0.020
0.042
0.041
0.042
0.044
0.044
0.007
0.015
0.020
0.025
0.059
0.049
0.048
0.047
0.053
0.083
DATE
FROM
TO
75/03/19
75/06/30
75/11/05
00665 32217 00031
TIME DEPTH PHOS-TOT CHLRPHYL INCDT LT
OF A REMNING
DAY FEET
12
12
12
12
12
14
14
14
14
14
15
15
15
15
15
30
30
30
30
30
20
20
20
20
20
25
25
25
25
25
0000
0005
0019
0050
0078
0000
0005
0015
0035
0050
0000
0005
0022
0045
0062
MG/L P
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
.054
.054
.056
.053
.060
.038
.049
.050
.047
.085
.086
.071
.082
.071
.096
UG/L PERCENT
3.3
8.5
11.1
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
APPENDIX D
TRIBUTARY AND WASTEWATER
TREATMENT PLANT DATA
-------
STOwtT RETRIEVAL OATE 77/U1/2?
NATL EUTROPHICATION SURVEY
EPA- LAS VEGAS
/TYPA/AMBNT/STQEAM
DATE TIME DEPTH N02J.N03
FROM OF
TO DAY FEET
74/11/1S
74/12/16
75/01/20
75/02/18
75/03/19
75/04/04
75/04/22
75/05/07
75/05/21
75/06/02
75/06/30
75/07/03
75/07/16
75/09/22
75/11/03
10
03
10
11
13
11
10
10
10
16
10
11
1 0
11
14
15
30
40
05
05
45
30
10
30
45
45
on
50
00
50
3206A1
38 41 4-5.0 119 30 20.0 4
Topaz Canal
32 15 TOPAZ LAKE
0/TOPAZ LAKE 150191
bNK SAMP OFF SEC HD 3 M E OF JCT HWY 395
HEPALES 04001004
0000 FEET DEPTH CLASS 00
10630
!f,N03
OTAL
IG/L
0.016
0.032
0.03?
0.035
0.050
0.050
0.005
0.015
0.025
0.015
0.005
0.010
0.015
0.005
0.025
00635
TOT KJEL
N
MG/L
0.700
0.700
0.500
1.750
0.950
1.050
1.000
0.500
1.450
0.200
1.000
0.450
1.150
0.300
0.700
00610
NH3-N
TOTAL
MG/L
0.155
0.144
o.n6
0.460
0.145
0.105
0.020
0.050
0.075
0.005
0.015
0.010
0.020
0.015
0.035
00671
PHOS-DIS
0"THO
MG/L P
0.040
0.040
0.035
0.040
0.035
0.030
0.015
0.015
0.0?5
0.010
0.010
0.010
0.010
0.005*
0.040
006t>5
PMOS-TOT
MG/L H
0.060
0.060
0.070
0.065
0.060
0.030
0.030
0.015
0.040
0.020
0.030
0.015
0.020
0.040
0.050
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
' &TL HJT
- UAS VEGAS
/TYPA/AMBNT/STREAM
FEET
38 38 10.0 11V 30 25.0 4
Unnamed Canal
32 15 TOPAZ LAKE
T/TOPAZ LAKE
UNMPRVO RD 8ROG 1.7 MI
11EPALES
0000 FEET DEPTH
150191
S OF TOPAZ PO
04001004
CLASS 00
DATE
FROM
TO
74/11/1S
74/12/16
75/01/20
75/02/18
75/03/19
75/04/04
75/04/22
75/05/07
75/05/21
75/06/0?
75/06/30
75/07/03
75/07/16
75/OV/22
75/11/03
TIME C
OF
OAY f
12 30
09 30
11 45
11 55
14 15
13 30
11 30
10 50
11 00
11 30
11 20
11 30
11 30
11 50
15 46
00630
N02(s,N03
N-TOTAL
M6/L
0.016
0.05*
0.092
0.070
0.025
0.042
0.015
0.0?5
0.085
0.055
0.010
O.Oln
o.ons
0.030
0.025
00625
TOT KJEL
N
MG/L
0.100
0.100K
0.500
0.950
0.350
0.750
0.300
1.000
0.900
0.250
0.650
0.300
0.200
0.475
0.200
00610
NH3-N
TOTAL
MG/L
0.0?0
0.056
0.096
0.070
0.095
0.015
0.015
0.020
0.030
0.015
0.015
0.015
0.010
0.010
0.010
00671
PHOS-DIS
ORTHO
MG/L P
0.020
0.024
0.030
0.020
0.025
0.022
0.020
0.0*5
0.025
0.020
0.020
0.025
0.015
0.045
0.025
00665
PMOS-TOT
MG/L P
0.030
0.030
0.040
0.050
0.070
0.030
0.060
0.090
O.OflO
0.130
0.080
0.030
0.040
0.100
0.040
-------
STORET RETRIEVAL LtATE 77/01/22
NATL F.UTHOPHICATION SURVEY
EPA- LAS VEGAS
/TYPA/AMBNT/STREA~<
DATE TIME DEPTH N02S.N03
FROM OF
TO DAY FEET
74/11/15
74/12/16
75/01/20
75/02/18
75/03/19
75/04/04
75/04/22
75/05/07
75/05/21
75/06/02
75/06/30
75/07/03
75/07/16
75/0*/22
75/11/03
10
09
11
11
13
12
11
10
10
11
11
11
11
11
15
4b
00
00
?5
25
30
00
30
45
on
00
05
05
20
05
3206C1
38 40 50.0 119 32 50.0 4
CALIFORNIA CREEK
32 15 TOPAZ LAKE
T/TOPAZ LAKE
US HWY 395 8POG .5 M S
11EPALES
0000 FEET DEPTH
150191
OF CA NV STATE LN
0400100*
CLASS 00
0630
-------
•'«.rt
- LAS VEGAS
1 )'•
/TYPA/A.-16NT/STREAM
DATE TIME DEPTH N02f,N03
FRO* OF N-
TO DAY FEET
74/11/15
74/12/16
75/01/20
75/02/18
75/03/19
75/04/04
75/04/22
75/05/07
75/05/21
75/06/02
75/06/30
75/07/03
75/07/16
75/OV/22
75/11/03
11
09
11
11
13
13
11
10
10
11
11
11
11
11
15
15
15
20
40
15
05
10
40
50
15
10
10
15
30
25
320601
38 38 30.0 119 31 50.0 4
SLINKARD CREEK
32 15 TOPAZ LAKE
T/TOPAZ LAKE 150191
8NK SAM ON H*Y 89 .1 MI w QF H«Y 395 JCT
11EPALES 0400100*
0000 FEET DEPTH CLASS 00
10630
!f,N03
•QTAL
IG/L
0.00°
0 . 0 ft o
0.11?
0.100
0.050
0.190
0.075
0.045
0.070
0.040
0.010
0.015
0.015
0.005
0.005
00625
TOT KJEL
N
MG/L
0.200
0.200
0.100
1.4bO
0.200
1.650
0.600
0.800
2.50'0
0.150
0.550
0.450
0.350
0.400
0. 300
00610
MH3-N
TOTAL
MG/L
0.050
0.016
0.008K
0.260
0.020
0.015
0.010
0.065
0.030
0.025
0.010
D.025
0.015
n.oio
0.005K
00671
PHOS-DIS
OUTMO
MG/L P
0.070
0.060
0.065
0.06b
0.065
0.075
0.060
0.065
0. OtiO
0.105
0.14Q
0.130
0.160
0.110
0.090
0066S
PhOS-TOT
MG/L P
0.085
0.080
0.080
0.120
0.110
0.080
0.110
0.100
0.230
0.110
0.155
0.140
0.200
0.1 JO
0.1 10
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 ^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 HEAD
3202 LAHO.NTA.N RESERVOIR
3204 RYE PATCH RESERVOIR
3?05 LAKE TAHOE
32C6 TOPAZ RESERVOIR
2207 UPPER PAKRANGAT LAKE
3203 WASHOE LAKE
3209 WILD HORSE RESERVOIR
3210 .WILSON RESERVOIR
3211 WALKER LAKE
MEDIAN
TOTAL P
0.016
0.198
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
0.135
0.320
0.120
0.080
500-
MEAN SEC
266.565
472.033
467.750
-3.269
376.000
470.000
494.555
439.400
197.333
405.333
MEAN
CHLORA
3.111
4.608
4.938
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
MEDIAN
DISS ORTHO P
0.005
0.148
0.039
0.003
O.G41 .
0.025
0.268
0.065
0.016
0.574
-------
PERCENT OF LAKES WITH HIGHER VALUES (NUMBER OF LAKES WITH HIGHER VALUES)
LAK€
CODE LAKE. NAME.
3201 LAKE MEAD
3202 LAHONTAN 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
INORG N
11 (
0 (
89 (
100 (
33 (
56 (
44 (
22 C
67 (
78 (
1)
0)
8)
9)
3)
5)
4)
2)
6)
7)
500-
MEAN SEC
78 (
22 1
44 (
100 (
67 (
33 (
0 (
11 (
89 (
56 (
7)
2)
4)
9)
6)
3)
0)
1)
8)
5)
t'.EAM
CHLORA
88 (
63 (
50 (
100 (
38 (
13 (
0 (
25 (
75 (
7)
5)
4)
8)
3)
1)
0)
2)
6)
15-
MIN DO
39 (
56 C
78 (
67 (
17 (
89 (
100 (
17 (
39 (
0 (
3)
5)
7)
6)
1)
8)
9)
1)
3)
0)
MEDIAN
DISS ORTHO f
89 (
22 ( .
56 (
100 (
44 (
67 (
11 (
33 (
78 (
o C
8)
2)
5)
9)
4)
.6>
1)
3)
7)
0)
------- |