U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
RAINBOW LAKE
NAVAJO COUNTY
ARIZONA
EPA REGION IX
WORKING PAPER No, 734
CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
-------
REPORT
ON
RAINBOW LAKE
NAVAJO COUNTY
ARIZONA
EPA REGION IX
WORKING PAPER No, 734
WITH THE COOPERATION OF THE
ARIZONA STATE DEPARTMENT OF HEALTH
AND THE
ARIZONA NATIONAL GUARD
AUGUST, 1977
-------
REPORT ON RAINBOW LAKE
NAVAJO COUNTY, ARIZONA
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
Corvallis Environmental Research Laboratory
Corvail is, Oregon
Working Paper No. 734
OFFICE OF RESEARCH AND DEVELOPMENT
U.S. ENVIRONMENTAL PROTECTION AGENCY
August 1977
-------
i
CONTENTS
Page
Foreword i i
List of Arizona Study Lakes iv
Lake and Drainage Area Map v
Sections
I. Conclusions 1
II. Lake and Drainage Basin Characteristics 5
III. Lake Water Quality Summary 7
IV. Nutrient Loadings 13
V. Literature Reviewed 19
VI. Appendices 20
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ii
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)J, water quality criteria/standards review
[§303(c)], clean lakes [§314(a,b)], and water quality monitoring
[5106 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
ere being made to advance the rationale and data base for refine-
ncnt 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 augir.ent plans implementation by the states.
ACKNOWLEDGMENTS
The staff of the National L-utrophication Survey (Office of
Research and Development, U.S. Environmental Protection Agency)
expresses sincere appreciation to the Arizona State Department
of Health for professional involvement, to the Arizona National
Guard for conducting the tributary sampling phase of the Survey,
and to those Arizona wastewater treatment plant operators who
provided effluent samples and flow data.
The staffs of the Bureau of Water Quality fontrol, Environ-
mental Health Services, Arizona State Department of Health, and
the Arizona Game and Fish Department, provided invaluable lake
documentation and counsel during the Survey, reviewed the pre-
liminary reports and provided critiques most useful in the
preparation of this Working Paper Series.
Major General John G. Smith, the Adjutant General of Arizona,
and Project Officer Colonel Richard A. Colson, who directed the
volunteer efforts of the Arizona National Guardsnen, are also
gratefully acknowledged for their assistance to the Survey.
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IV
NATIONAL EUTROPHICATION SURVEY
STUDY LAKES
STATE OF ARIZONA
LAKE NAME
Big Lake
Fools Hollow Lake
Lake Havasu
Luna Lake
Lyman Lake
Lake Mohave
Lake Pleasant
Lake Powell
Rainbow Lake
Theodore Roosevelt Lake
San Carlos Reservoir
COUNTY
Apache
[Java jo
Mohave (San Bernadino
in CA)
Apache
Apache
Mohave (Clark in NV)
Yavapai, Maricopa
Coconino (Kane, Garfield,
San Juan in UT)
iiavajo
Gil a
Graham, Gila, Pinal
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-34 08'
RAINBOW LAKE
Tributary Sampling Site
Lake Sampling Site
Sewage Treatment Facility
Drainage Area Boundary
1 2 3
Scale'
2 Mi.
Map Location
-34'06
4 Km.
110*00'
109'58
-------
-34'08
Map Location
-34'06'
110'00'
RAINBOW LAKE
Tributary Sampling Site
Lake Sampl ing Site
Sewage Treatment Facility
Drainage Area Boundary
1 2 3
Scale'
2 Mi.
109'58
109'56
4Km.
10 9'54'
-------
REPORT ON RAINBOW LAKE, ARIZONA
STORE! NO. 0409
I. CONCLUSIONS
A. Trophic Condition:*
On the basis of field observations and Survey data,
Rainbow Lake is considered eutrophic, i.e., nutrient rich
and highly productive. Whether such nutrient enrichment
is to be considered beneficial or deleterious is deter-
mined by its actual or potential impact upon designated
beneficial water uses of each lake.
Chlorophyll a^ levels in the lake ranged from 2.0 ug/1
to 47.7 pg/1 with a mean of 16.4 ug/1. Secchi disc trans-
parency was low during spring sampling and potential for
primary production as measured by algal assay control yield
was high in both spring and fall. Of the 11 Arizona lakes
sampled in 1975, 4 had higher median total phosphorus values
(0.046 mg/1), 8 had higher median inorganic nitrogen levels
(0.045 mg/1) and 4 had higher median orthophosphorus values
(0.009 mg/1) than Rainbow Lake.
Survey limnologists reported severe macrophyte problems
in Rainbow Lake. Submerged weeds were observed over most
of the lake bottom on all sampling occasions, and floating
macrophytes were noted to cover 50-60% of the lake during
*See Appendix E.
-------
June and October. Other sources report that the lake also exper-
iences some problem algal growths as a result of septic tank seep-
age (A.C. Hunt, personal communication) and dissolved oxygen levels
below the state standard for maintenance of a cold water fishery
(Arizona Department of Health Services, 1976).
B. Rate-Limiting Nutrient:
The algal assay results indicate that Rainbow Lake was limited
by available nitrogen during the spring sampling (03/04/75) and co-
limited by both nitrogen and phosphorus during the October sampling
(10/01/75). Lake data suggest primary limitation by nitrogen through-
out the sampling year.
C. Nutrient Controllability:
1. Point sources -
During the sampling year there was one known point source
impacting Rainbow Lake which participated in the Survey. This
source, Charlie Clark's Restaurant, contributed an estimated
3.0% of the total phosphorus load to the lake. In addition,
there are a number of small municipal and domestic plants that
are located in the communities of Lakeside and Pinetop which
did not participate in the 1975 Survey. The State of Arizona
considers three of these plants to be significant dischargers:
the Pine Shadow Mobile Home Park, the El Rancho Restaurant, and
the Pinetop Country Club Village, all in the community of
-------
Pinetop (Arizona Department of Health Services, 1976). Because
data on the nutrient discharges from the plants are not avail-
able, these sources are not listed in the lake nutrient budget
on pages 14-15; however, their nutrient loads are included in
the tributary loadings for Walnut Creek. A sewage treatment
facility is planned for the Pinetop-Lakeside area which will
pump effluent to dry lake beds outside of the drainage basin of
Rainbow Lake. This facility may reduce nutrient loadings to the
lake from the above mentioned sources as well as from septic
tanks in the area (W. H. Shafer, personal communication).
2
The present calculated loading of 2.17 g P/m /yr is over
three times that proposed by Vollenweider (1975) as a "eutrophic"
rate for a lake with such volume and hydraulic retention time.
Unless the annual phosphorus loading can be reduced, Rainbow Lake
can be expected to exhibit progressive symptoms of eutrophication.
2. Nonpoint sources -
Walnut Creek contributed 82.7% of the total phosphorus load
to Rainbow Lake during the sampling year and ungaged drainage
areas were estimated to have contributed 15.5% of the total. It
is not known at this time how much of the "nonpoint" loading
attributed to Walnut Creek is actually a result of unmeasured
point source contributions; however, the Arizona Department of
Health Services (1976) states that discharges from package plants
-------
in the Little Colorado River Basin often are the entire flow of
their receiving waters, creating considerable health and
environmental problems.
-------
II. LAKE AND DRAINAGE BASIN CHARACTERISTICS
Lake and drainage basin characteristics are itemized below.
Lake morphometry data were provided by Ned Rathbun (1974); average
surface area and maximum volume at spillway are indicated. Tribu-
tary flow data were provided by the Arizona District Office of
the U.S. Geological Survey (USGS). Outlet drainage area includes
the lake surface area. Mean hydraulic retention time was found by
dividing the lake volume by mean flow of the outlet. Precipitation
values are estimated by methods as outlined in National Eutrophi-
cation Survey (NES) Working Paper No. 175. A table of metric/
English conversions is included as Appendix A.
A. Lake Morphometry:
1. Surface area: 0.32 km2.
2. Mean depth: 4.6 meters.
3. Maximum depth: 5.0 meters.
4. Volume: 1.479 x 106 m3.
5. Mean hydraulic retention time: 171 days.
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B. Tributary and Outlet:
(See Appendix B for flow data)
1. Tributaries -
Drainage^ Mean Flow
Name area (km ) (m3/sec)
A-2 Walnut Creek 21.3 0.25
Minor tributaries and
immediate drainage - !_•!_ 0.04
Totals 25.9 0.29
2. Outlets - A-l Walnut Creek 26.2 0.10
C. Precipitation:
1. Year of sampling: 33.4 cm.
2. Mean annual: 27.9 cm.
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I. LAKE WATER QUALITY SUMMARY
Rainbow 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 col-
lected from two stations on the lake and from one or more depths
at each station (see map, page v). During each visit, depth-
integrated samples were collected from each station for chloro-
phyll
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RAIM80I*
STOJET CODE 0409
PARAMETER
< 3/ 4/7* )
S»»» = 1
'flNGE
A. PHYSICAL AND CHEMICAL CHARACTERISTICS
( 3/ 4/75 >
MAX
S»«« = 2 DEPTH
HAMGE
(METE-S) N* RANGE MEDIAN (METERS*
( 6/19/75 )
MAX
S««» = 2 DEPTH
RANGE
RANGF MEDIAN (METERS)
TEMPERATURE (DEG CFNT)
O.-l.S M OEPTH
"AX OEPTH**
DISSOLVED OXYGFN
O.-l.S »
MAX iJEPTH**
CONDUCTIVITY (IHHO=I
O.-l.S M DEPTH
DEPTH**
PH (STANDARD 'IMTSl
O.-l.S M DEPTH
MAX DEPTH**
TOTAL ALKALINITY (Mfi/L)
O.-l.S M DEPTH
*AX DEPTH**
TOTAL P (MG/L)
O.-l.S M DEPTH
MAX DEPTH**
DISSOLVED ORTHO P (MG/L)
O.-l.S M DEPTH
MAX OEPTH**
N02+N03
O.-l.S M PEPTH
MAX DEPTH**
AMMONIA ("G/L1
O.-l.S M DEPTH
"A< OEPTH**
KJELOAHL "
O.-l.S M HEPTn
MAX DEPTH**
DISC
0 «««««..»»»»» oooott ooeo_oe«et>
)
0 ooooo-.oooo ..... ..........
o ........... ..... ..........
0 Ioo*oloo«n lllll llll-lllll
)
1 119.- HQ. 110. ?.7- 2.7
1 0.033-0.033 0.033 ?.7- 2.7
'L>
1 0.014-0.014 0.014 2.7- 2.7
1 0. 020-0. 0?0 0.0?() 2.7- 2.7
1 (1. 020-0. 020 0.020 3.7- 2.7
1 O.SOO-O.SOO 0.500 2.7- 2.7
4
2
2
4
4
1
4
1
4
1
1
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4.8- 5.6
1 A A t A ^t
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10.0- 10.2
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8.5- 8.6
117.- 118.
116.- 116.
0.023-0.052
0.061-0.061
0.005-0.007
0.008-0.008
nrt O ft A ft O A
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116.
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6.6-
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10.1-
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98.-
0.046-0
0.085-0
0.014-0
0.020-0
OA 3 A_ A
. OcU*"w
0.020-0
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168.
10. 1
10.0
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A ^ A
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15.5
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0.046
0.085
0.016
0.020
OA 9C
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.043
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1.5-
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0 «»»««-»«»«« «»•*«
* N = NO. OF SAMPLES
»» MAXIMUM DEPTH SAMPLED AT EACH SITE
0*0 s = NO. OF SITES SAMPLED ON THIS DATE
-------
KAINHOW LA*F
STORET CCrE 0409
TtV?£PAT't^e: (OEG
O.-l.s M rE-TH
MAX DEPTH-oo
DISSOLVE OXYGFN
O.-l.S ™ r>EJTH
MAX DEPTH**
CONDUCTIVITY (l|V
O.-l.S M .)Et-TM
MAX DFPT-IOO
PH (STAMPfl-L- IINI
0,-l.S •" ^EPT1-1
MAX DEPTH*0
TOTAL ALKALINITY
o.-i.s w OE-TH
MAX DEPTH*'
TOTAL P (Mfc/L)
O.-l.S M DEPTH
MAX DFPTh»«
DISSOLVED ORTHO
O.-l.S M DEPTH
MAX DEPTH»»
0°I;"°V^Th
MAX DFPTH««
AMMONIA C'O/L)
O.-l.S M TEUTH
MAX DEPTH'o
KJELDAHL M (MR/L
O.-l.S M HE^TH
MAX OEPTH»»
( 10X 1/75 )
N» 3ANGE MEDIAN
CENT)
3
2
3
2
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3
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3
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(Mr,/L)
3
2
3
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P fMG/L)
3
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13.8-
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8.6-
8.6-
12".-
120.-
0.043-0
O.OO-O
0.006-0
0.006-0
0.020-0
0.020-0
0.020-0
0.020-0
0.600-0
0.600-0
IS. 7
IS. 6
5.0
4.4
179.
179.
8.8
8.8
120.
120.
.118
.118
.018
.018
.020
.020
.040
.020
.600
.600
IS. 6
14.7
4.4
3.7
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8.7
120.
120.
0.062
O.npfl
0.011
0.012
0.020
0.0?0
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0.0?0
0.600
0.610
A.
1
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0.
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0.
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ft.
0.
0.
0.
0.
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n-
0-
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PH
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1
1
1
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A. PHYSICAL AND CHEMICAL CHARACTERISTICS
SECC-iI DISC
l.fc- 2.4
« N = NO. OF SAMPLES
«« MAXIMUM DEPTH SAMPLED AT EACH SITE
««* S = NO. OF SITES SAMPLE!) ON THIS DATE
-------
10
B. Biological Characteristics:
1. Phytoplankton -
Sampling
Date
03/04/75
06/19/75
10/06/75
Dominant
Genera
1. Cyclotella
2. Chroomonas?
3. Cryptomonas
4. Oocystis
5. Ankistrodesmus
Other genera
Total
1. Fragilaria
2. Epithemia
3. Cryptomonas
4. Chroomonas?
5. Cocconeis
Other genera
Total
1. Fragilaria
2. Chroomonas?
3. Cryptomonas
4. Epithemia
5. Cocconeis
Other genera
Total
Algal
Units
Per ml
52,327
706
680
419
419
1,125
55,676
17,976
618
353
265
132
398
19,742
3,821
303
243
121
30
62
4,580
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11
2. Chlorophyll a^ -
Sampling
Date
03/04/75
06/19/75
10/01/75
Station
Number
01
02
01
02
01
02
Chlorophyll a
(yg/D
8.1
18.3
11.2
47.7
10.9
2.0
-------
12
C. Limiting Nutrient Study:
1. Autoclaved, filtered, and nutrient spiked
a. 03/04/75
Spike (mg/1)
Control
0.05 P
0.05 P + 1.0 N
1.00 N
b. 10/01/75
Ortho P
Cone, (mg/1)
0.020
0.070
0.070
0.020
Spike (mg/1)
Control
0.05 P
0.05 P + 1.0 N
1.00 N
Ortho
Cone.
P
(mg/1)
0.020
0.070
0.070
0.020
Inorganic N
Cone, (mg/1)
0.080
0.080
1.080
1.080
Inorganic N
Cone, (mg/1)
0.115
0.115
1.115
1.115
Maximum Yield
(mg/1-dry wt.)
4.0
4.7
21.9
8.0
Maximum Yield
(mg/1-dry wt.)
4.8
6.9
35.6
5.5
-------
13
2. Discussion -
The control yields of the assay alga, Selenastrum capricornutum*,
indicate that the potential for primary productivity in Rainbow
Lake was high at both sample collection times (03/04/75, 10/01/75).
In the March assay, the addition of nitrogen alone and in combination
with phosphorus produced a significant increase in growth over that
of the control, indicating nitrogen limitation at this time. In
the October assay, a small growth response was noted with the addition
of both nitrogen and phosphorus alone, and with the simultaneous
addition of both nutrients, suggesting colimitation by nitrogen and
phosphorus.
The mean inorganic nitrogen to orthophosphorus ratios (N/P) in
the lake data were approximately 5/1 in the spring and 4/1 in the
summer and fall suggesting primary limitation by nitrogen (a mean
N/P ratio of 14/1 or greater generally reflects phosphorus limitation),
*For further information regarding the algal assay test
procedure and selection of test organisms, see U.S. EPA (1971).
-------
14
IV. NUTRIFNT lOADINGS
(Sc(> Appendix I) I'of d.il.d)
For the determination of nutrient loadings, the Arizona National
Guard collected monthly near-surface grab samples from each of the
tributary sites indicated on the map (page v), except for the high
runoff months of April and May when two samples were collected.
Sampling was begun in December 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 provided
by the Arizona 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
2
nutrient loads, in kg/km /year, in Walnut Creek at Station A-2 and
2
multiplying the means by the ZZ area in km .
The operator of the Charlie Clark's Restaurant provided several
monthly effluent samples and corresponding flow data.
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A. Waste Sources:
1. Known municipal -
Name
Pop.*
Served
.Charlie Clark's 100
Restaurant
15
Treatment*
Activated
Sludge
Mean Flow ^ Receiving
(m3/d x 10"*) Water
0.038** Unnamed Creek/
Walnut Creek
2. Known industrial - None
*Provided by treatment,^!ant operator.
**Estimated at 0.3785 m /capita/day.
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16
Annual Total Phosphorus Loading - Average Year:
1. Inputs -
% of
Source kg P/yr total
a. Tributaries (nonpoint load) -
A-2 Walnut Creek 565 81.3
b. Minor tributaries and immediate
drainage (nonpoint load) - 105 15.2
c. Known municipal STP's -
Charlie Clark's Restaurant 10 1.4
d. Septic tanks* - 10 1.4
e. Known industrial - None
f. Direct precipitation** - 5 0.7
Total 695 100.0%
2. Outputs - A-l Walnut Creek 340
3. Net annual P accumulation - 355
*Estimate based on 41 lakeshore residences.
**Estimated (See NES Working Paper No. 175).
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17
C. Annual Total Nitrogen Loading - Average Year:
1. Inputs -
% of
Source kg N/yr total
a. Tributaries (nonpoint load) -
A-2 Walnut Creek 3,625 75.9
b. Minor tributaries and immediate
drainage (nonpoint load) - 1,625 14.3
c. Known municipal STP's -
Charlie Clark's Restaurant 340 3.0
d.. Septic tanks* - 435 3.8
e. Known industrial - None
f. Direct precipitation** - 345 3.0
Total 11,370 100.0%
2. Outputs - A-l Walnut Creek 6,000
3. Net annual N accumulation - 5,370
*Estimate based on 41 lakeshore residences.
**Estimated (See NES Working Paper No. 175).
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18
D. Mean Annual Nonpoint Nutrient Export by Subdrainage Area:
2 2
Tributairy_ kg P/km /yr kg N/km /yr
Walnut Creek 26 396
E. Mean Nutrient Concentrations in Ungaged Streams:
Mean Total P Mean Total N
Tributary (mg/1) (mg/1)
*1-B Trout Creek 0.060 1.147
*1-C Gooseberry Creek 0.061 0.767
*Special interest stream outside the Rainbow Lake watershed.
-------
19
E. Yearly Loading:
In the following table, the existing phosphorus 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 be applicable to water
bodies with very short retention times or in which light penetration
is severely restricted from high concentrations of suspended solids
in the surface waters.
Total Yearly
Phosphorus Loading
(g/m2/yr)
Estimated loading for Rainbow Lake 2.17
Vollenweider's "eutrophic" loading 0.61
Vollenweider's "oligotrophic" loading 0.31
-------
20
V. LITERATURE REVIEWED
Arizona Department of Health Services. 1976. Water Quality
Management Basin Plan, Little Colorado River Basin, Arizona.
Phoenix, Arizona.
Hunt, A. C. 1976. Personal Communication (septic tanks).
Pinetop-Lakeside Sanitation District, Pinetop, Arizona.
Rathbun, Ned L. 1974. Personal Communication (morphometry
data). Arizona Game and Fish Department, Phoenix, Arizona.
Shafer, W. H. Personal Communication (lake nutrient loadings).
Arizona Department of Health Services, Phoenix, Arizona.
U.S. Environmental Protection Agency. 1971. Algal Assay Pro-
cedure 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.
-------
21
VI. APPENDICES
APPENDIX A
CONVERSION FACTORS
-------
CONVERSION FACTORS
Hectare:, x 2.471 =• acres
Kilometers x 0.6214 ~ miles
Meters x 3.281 = feet
Cubic me.'tors x 8.107 x 10 - acre/feet
Square kilometers x 0.3861 - square miles
Cubic meters/sec x 35.315 = cubic feet/sec
Centimeters x 0.3937 - inches
«
Kilograms x 2.205 = pounds
Kilograms/square kilometer x 5.711 = Ibs/square mile
-------
APPENDIX B
TRIBUTARY FLOW DATA
-------
TH16UTAHY FLO* INFOKMATION FOrt ARIZONA
ll/26/7b
LAKE CODE 0409
TOTAL ORAINAut AhtA Uf LAK£
-------
APPENDIX C
PHYSICAL AND CHEMICAL DATA
-------
STORE! RETRIEVAL DATE 76/11/26
NATL EUThOPHlCATIUN SU*-';.Y
EPA-LAS VEGAS
0*0901
34 09 32.0 109 58 b7.0 3
KAINBOW LAKE
0*017 ARIZONA
110*92
HEPALtS 2111202
0011 FEET OEi-TH CLASS 00
DATE
FKOM
TO
74/03/04
75/03/0*
75/06/19
7S/10/01
DATE
FROM
TO
74/03/04
75/03/04
75/06/19
75/10/01
TIME OEPTh
OF
DAY FEET
15 35 0009
15 35 OOOu
15 35 0005
15 35 0009
11 20 0000
11 20 0005
16 45 OOOP
16 45 0005
TIME DEPTn
OF
DAY FEET
15 35 0009
15 35 0000
IS 35 0005
11 20 0000
16 45 0000
16 45 0005
00010
KATtR
TEMP
CtNT
5.<-
5.3
5.6
15.5
IS. 5
15.7
15.6
00665
PMOb-TOT
MU/L P
0.033
0.023
0.025
0.0*7
0.062
0.118
00300 00077 00094 00*00 00*10 00610 0062b
DO THANSP CNOUCTVY PM T AL* NM3-N TOT KJEL
StCCHl FIELD CAC03 TOTAL N
MG/L INCHES MICROMMO su MG/L MG/L MG/L
10.0 42
10.2
10.2
7.4
7.4
5.0 96
4.4
32217 00031
CMLHPHYL INCDT LT
A REMNlNG
UG/L PERCENT
8.1
11.2
10.9
2*b 8.65
241 8.65
239 8.65
159 10.15
159
178 8.60
179 b.60
119 0.020 0.500
118 0.020 0.600
lib 0.030 0.400
82 0.060 0.500
120 0.040 0.600
120 U.020K 0.600
00630 00b71
NO?INOJ PnOS-OIS
N-TOTAL ORTHO
MG/L MG/L »>
O.Q20K
0.020K
0.020K
0.030
0.020K
0.020K
0.01*
0.005
O.OOa
0.01*
0.011
O.Ola
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL OiTE 76/11/26
NATL EUTROPHICATION St'°.tY
ERA-LAS VEGAS
00010
00300 00077
HELD
DATE
F-
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
APPENDIX D
TRIBUTARY AND WASTEWATER
TREATMENT PLANT DATA
-------
STORET RETRIEVAL OATE 7S/11/30
NATL EUTROPHICATIOM SU lY
EPA- LAS VEGAS
0409A1
34 09 32.0 109 58 45.0 4
MALNUT CuEfcK
04 15 MCNAkY
0/*AINBO* LAKE 110492
HT 173 BHDG bT»N LK OF THE wOUUS/LKSIDE
11EPALES 2111204
0000 FEET UEPTH CLASS 00
DATE
FROM
TO
74/12/07
75/02/01
75/03/08
75/04/12
75/04/29
75/05/11
75/05/26
75/06/08
75/07/06
75/08/23
75/09/07
75/10/12
TIME DEPTH
OF
DAY FEET
10 35
12 20
09 30
15 40
14 35
14 30
12 30
15 30
15 30
15 20
17 45
13 00
00630
N02&N03
N-TOTAL
MG/L
2.800
0.016
0.008
0.005
0.010
0.020
0.010
0.005
0.020
0.005
0.005
0.005
00625
TOT KJEL
N
MG/L
1.400
0.600
1.800
0.700
1.400
1.300
0.900
0.450
0.800
0.650
1.000
0.500
00610
NH3-N
TOTAL
MG/L
0.020
0.040
0.032
0.015
0.025
0.030
0.015
0.035
0.030
0.055
0.070
0.025
00671
PHOS-OIS
ORTHO
MG/L P
0.035
0.008
O.OOb
0.010
0.005K
0.020
0.010
0.010
0.040
0.060
0.060
0.015
00665
PHOS-TOT
MG/L P
0.140
0.050
0.040
0.080
0.060
0.040
0.030
0.020
0.080
0.120
0.100
0.050
K VALUE KNOM TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DATE 76/11/30
NATL EUTROPHltATlON SljrtvEY
EPA- LAS VEGAS
DATE
F*fOM
TO
74/12/07
75/01/05
75/02/01
75/03/08
75/04/12
75/04/29
75/05/11
75/05/26
75/06/08
75/07/06
75/08/23
75/09/07
75/10/12
75/11/16
TIME
OF
DAY
10 30
15 35
14 40
09 10
13 35
14 50
14 20
10 15
15 40
13 45
12 35
17 20
13 30
13 00
0409A2
34 06 26.0 109 58 30.0 4
XALNUT CHEEK
04 15 MCMArtY
T/RAINBOW LAKE 1104S»2
HIM HO BRDG .2 M * OF WOODLAND HO JCT
li£P*L€s 2111204
0000 FEET DEPTH CLASS 00
0630
t.N03
OTAL
IG/L
0.368
U.368
0.264
0.176
0.070
U.I 75
0.06Q
0.150
0.050
U.I 75
0.110
U.220
0.160
0.220
00625
TOT KJtL
N
MG/L
1.000
1.200
1.500
0.75U
1.200
0.800
2.300
0.300
0.250
0.400
0.200
0.400
0.900
0.400
00610
NM3-N
TOTAL
MG/L
0.020
0.024
0.024
0.040
0.032
0.025
0.04a
0.015
0.025
0.025
0.025
0.020
0.020
0.010
00671
PHOS-DIS
OHTMO
MG/L P
0.055
0.060
0.056
0.028
0.045
0.025
0.055
0.025
0.040
0.045
0.0*0
0.040
0.035
0.040
00665
PMOS-TOT
MG/L P
0.080
0.090
0.090
0.070
0.110
0.070
0.110
0.040
0.060
0.070
0.060
0.080
0.050
0.060
-------
STORET RETRIEVAL DATE 76/11/30
NATL EUTROPHICATION S, -N03
FROM OF
TO DAY FEET
74/12/07
75/01/05
75/02/01
75/03/08
75/04/12
75/04/29
75/05/11
75/05/26
75/06/09
75/07/06
75/08/23
75/09/07
75/10/13
75/11/16
12
13
11
10
14
14
15
11
15
14
13
15
17
30
30
00
00
55
15
00
00
00
30
25
30
45
04091B
34 01 45.0 109 49 40.0 4
TROUT CREEK
04 15 MCNAHY
T/«AINBOw LAKE 110492
UPPER LOG HOAD BH06
litPALtS 2111204
0000 FEET DEPTH CLASS 00
0630
«>N03
OTAL
6/L
o.ooe
0.056
0.048
0.040
0.060
0.070
0.025
0.015
0.005
0.015
0.005
0.015
0.005
0.005
00625
TOT KJEL
N
MG/L
0.900
1.400
0.500
2.600
0.650
1.800
0.600
0.750
0.050K
0.100
0.100K
2.600
1.200
0.300
00610
NH3-N
TOTAL
MG/L
0.010
0.112
0.016
0.032
0.030
0.023
0.040
0.025
0.020
0.005K
0.015
0.030
0.025
0.010
00671
PHOS-OIS
OHTrtU
MG/L P
0.030
0.030
0.032
0.056
0.020
0.005K
0.015
0.010
0.030
0.040
0.040
0.045
0.045
0.040
00665
PHOS-TOT
MG/L P
0.060
0.050
0.032
0.130
0.100
0.030
0.025
0.030
0.040
0.080
0.110
0.050
0.040
K VALUE KNOWN TO BE LESS
THAN INDICATED
-------
STORET RETRIEVAL DA1E 76/11/JO
NATL EUTROPHICATION Si '£Y
EPA- LAS VEGAS
DATE TIME DEPTH N02NN03
FROM OF
TO DAY FEET
74/12/07
75/02/01
75/03/08
75/04/12
75/04/29
75/05/11
75/05/26
75/06/09
75/07/06
75/08/23
75/09/07
75/10/12
75/11/16
11
11
11
14
11
16
11
15
15
14
16
17
38
40
00
10
25
10
45
45
05
20
05
15
04091C
34 04 50.0 109 48 30.0 4
GOOSEBERRY CHEEK
04 15 MCNASY
T/ftAINBO* LAKE 110492
HWY 7J SHDG 2.5 MI E OK MCNAHY
11EHALES 2111204
0000 FEET DEHTH CLASS 00
10630
INN03
'OTAL
IG/L
0.006
0.136
0.120
0.025
0.045
0.015
0.015
0.010
0.035
0.015
0.015
0.065
0.010
00625
TOT KJEL
N
MG/L
0.500
1.200
1.255
0.650
1.250
0.850
0.550
0.250
0.650
0.600
0.60U
0.500
0.600
00610
NM3-N
TOTAL
MG/L
0.005
0.032
0.044
0.020
0.055
0.020
0.020
0.015
0.015
0.015
0.015
0.075
0.010
00671
PHOS-DIS
OMTHO
MG/L K-
0.010
0.016
0.028
0.020
0.010
0.030
0.025
0.025
0.010
0.015
0.015
0.015
0.015
00665
PHOS-TOT
MG/L P
0.030
0.070
0.125
0.060
0.170
0.040
0.030
0.050
0.030
0.070
0.050
0.040
0.030
-------
STOktT RETRIEVAL DATE ?">/ll/30
MATL EUTROPMlCATIOM Sc- 'it
EPA- LAS VEGAS
DATE
TO
TIME DEPTH
OF
DAY
FEET
0409YA AS0409YA
34 07 30.0 009 56 00.0 4
CHARLIE CLACKS REST.
o* is MCNAHY
T/KAlMbOw LAKt
UNNAMED CREEK
11EPALES 2141304
0000 FEET DEPTH CLASS 00
P000100
75/03/01 11 00
75/04/lb 10 00
75/07/20 11 00
75/08/On 19 15
00630
N02t>N03
N-TOTAL
MG/L
1.520
1.950
00625
TOT KjEL
N
MG/L
44.000
1.500
37.000
52.000
00610
NM3-N
TOTAL
MG/L
0.240
0.083
00671
PHOS-OIS
ORTHO
MG/L P
3.500
1.850
00665
PMOS-TOT
MG/L P
4.400
3.200
7.500
10.000
50051
FLOW
RATE
INST MGD
50053
CONDUIT
FLOw-MGD
MONTHLY
0.0002
-------
APPENDIX E
PARAMETRIC RANKINGS OF LAKES
SAMPLED BY NES IN 1975
STATE OF ARIZONA
Mean or median values for six of the key parameters evaluated
in establishing the trophic conditions of Arizona 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
0401 BIG LAKE
0402 FOOLS HOLLOW
0403 LAKE HAVASU
0404 LUNA LAKE
0405 LYMAN LAKE
0406 LAKE HOHAVE
0407 LAKE PLEASANT
0408 LAKE POWELL
0409 RAINBOW LAKE
0410 ROOSEVELT LAKE •
0411 SAN CARLOS RESERVOIR
3201 LAKE MEAD
MEDIAN
TOTAL P
0.032
0.059
0.015
0.182
0.099
0.017
0.027
0.009
0.046
0.020
0.056
0.020
MEDIAN
INORG N
0.090
0.090
0.170
0.050
0.060
0.24.0
0.040
0.400
0.045
0.040
0.060
0.505
500-
MEAN SEC
386.000
466.600
420.231
396.250
484.667
369.667
449.154
239.000
440.750
429.917
474.500
453.600
MEAN
CHLORA
2.900
10.683
3.948
3.400
2.633
4.404
9.808
1.333
16.367
4.073
14.750
1.150
15-
MIN DO
9.000
14.800
10.800
12.200
9.000
8.600
14.900
12.200
12.000
14.000
14.600
8.000
MEDI
OISS ORT
0.007
0.014
0.005
0.131
0.056
0.010
0.004
0.010
0.009
0.008
0.009
0.007
-------
PERCENT OF LAKES WITH HIGHER VALUES (NUMBER OF LAKES WITH HIGHER VALUES)
LAKE
CODE LAKE NAME
0401 BIG LAKE
0402 FOOLS HOLLOW
0403 LAKE HAVASU
0404 LUNA LAKE
0405 LYMAN LAKE
0406 LAKE MOHAVE
0407 LAKE PLEASANT
0408 LAKZ POWELL
0409 RAINBOW LAKE
0410 ROOSEVELT LAKE
0411 SAN CARLOS RESERVOIR
3201 LAKE MEAD
MEDIAN
TOTAL
45 (
18 (
91 (
0 (
9 (
82 (
55 (
100 <
36 (
68 (
27 (
66 <
P
5)
2)
10)
0)
1)
9)
6)
11)
4)
7)
3)
7)
MEDIAN
INORG
41 (
41 (
27 <
73 (
64 (
18 (
95 (
9 (
82 (
95 (
55 (
0 (
N
4)
4)
3)
8)
7)
2)
10)
1)
9)
10)
6)
0)
500-
MEAN
82
18
64
73
0
91
36
100
45
55
9
27
SEC
< 9)
( 2)
( 7)
( 8)
( 0)
( 10)
( 4)
( 11)
( 5)
( 6)
( 1)
( 3)
MEAN
CHLOftA
73 (
18 (
55 (
64 (
82 <
36 <
27 (
91 <
0 (
45 <
9 1
100 <
8)
2)
6)
7)
9)
4)
3)
; 10)
: o)
t 5)
I 1)
1 11)
15-
MIN
77
9
64
41
77
91
0
41
55
27
18
100
00
( 8)
( 1)
( 7)
( 4)
( 8)
( 10)
( 0)
( 4)
( 6)
< 3)
( 2)
( 11)
MEDIAN
UISS
73
18
91
0
9
32
100
32
45
64
55
82
OriTrO
( 8)
( 2)
( 10)
( 0)
( 1>
( 3)
< 11)
( 3)
( 5)
( 7)
( 6)
( 9)
------- |