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

-------
         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

-------
                                  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.

-------
                                 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.

-------
                                 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

-------
                                    WILSON  RESERVOIR!

                                     0  Tributary Sampling Site!
                                     X  Lake Sampling Site!
                                               5              10 Km.'
  WILSON
RESERVOIR
41'45'-
                                                                                41*40'
                                                                                 41'35'—

-------
                  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.

-------
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

-------
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

-------
                                  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

-------
                                  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).

-------
                                  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 .

-------
                                   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).

-------
                                   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.

-------
                                  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.

-------
                                  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

-------
                                  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.

-------
                                 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





-------
        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)

-------