U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
JOHNSON RESERVOIR
DAWSON AND GOSPER COUNTIES
NEBRASM
EPA REGION VII
WORKING PAPER No, 558
CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
•&G.P.O. 699-440
-------
REPORT
ON
JOHNSON RESERVOIR
DAWSON AND GOSPER COUNTIES
NEBRASM
EPA REGION VII
WORKING PAPER No, 558
WITH THE COOPERATION OF THE
NEBRASKA DEPARTMENT OF ENVIRONMENTAL CONTROL
AND THE
NEBRASKA NATIONAL GUARD
AUGUST, 1976
-------
CONTENTS
Page
Foreword i i
List of Nebraska Study Reservoirs iv
Lake and Drainage Area Map v
Sections
I. Conclusions 1
II. Lake and Drainage Basin Characteristics 3
III. Lake Water Quality Summary 4
IV. Nutrient Loadings 8
V. Literature Reviewed 12
VI. Appendices 13
-------
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, concentrations,
and impact on selected freshwater lakes as a basis for formulating
comprehensive and coordinated national, regional, and state management
practices relating to point-source discharge reduction and non-point
source pollution abatement in lake watersheds.
ANALYTIC APPROACH
The mathematical and statistical procedures selected for the
Survey's eutrophication analysis are based on related concepts that:
a. A generalized representation or model relating
sources, concentrations, and impacts can be constructed.
b. By applying measurements of relevant parameters
associated with lake degradation, the generalized model
can be transformed into an operational representation of
a lake, its drainage basin, and related nutrients.
c. With such a transformation, an assessment of the
potential for eutrophication control can be made.
LAKE ANALYSIS
In this report, the first stage of evaluation of lake and water-
shed data collected from the study lake and its drainage basin is
documented. The report is formatted to provide state environmental
agencies with specific information for basin planning [§303(e)j, water
quality criteria/standards review [§303(c)L 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.
-------
Ill
Beyond the single lake analysis, broader based correlations
between nutrient concentrations (and loading) and trophic condi-
tion are being made to advance the rationale and data base for
refinement of nutrient water quality criteria for the Nation's
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 EPA
and to augment plans implementation by the states.
ACKNOWLEDGMENT
The staff of the National Eutrophication Survey (Office of
Research & Development, U. S. Environmental Protection Agency)
expresses sincere appreciation to the Nebraska Department of
Environmental Control for professional involvement, to the
Nebraska National Guard for conducting the tributary sampling
phase of the Survey, and to those wastewater treatment plant
operators who voluntarily provided effluent samples and flow
data.
The staff of the Water Pollution Control Division, Department
of Environmental Control, 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 Francis L. Winner, the Adjutant General of Nebraska,
and Project Officer Colonel Burl M. Johnson, who directed the volun-
teer efforts of the Nebraska National Guardsmen, are also gratefully
acknowledged for their assistance to the Survey.
-------
IV
NATIONAL EUTROPHICATION SURVEY
STATE OF NEBRASKA
RESERVOIR NAME COUNTY
Branched Oak Lancaster
Harlan County Harlan
Harry D. Strunk Frontier
Hugh Butler Frontier, Red Willow
Johnson Dawson, Gosper
McConaughy Keith
Pawnee Lancaster
Sherman Sherman
Swanson Hitchcock
-------
[ Nebraska^
H • \
Map Location
JOHNSON RESERVOIR
® Tributary Sampling Site
X Lako Sampling Site
0 Lakeshore Dwellings
1
jKm.
Scale
40'42—I
4040—I
99 52
99 50
-------
JOHNSON RESERVOIR
STORE! NO. 3105
I. CONCLUSIONS
A. Trophic Condition:
Survey data indicate Johnson Reservoir is eutrophic. It
ranked eighth in overall trophic quality when the nine Nebraska
water bodies sampled in 1974 were compared using a combination of
six parameters*. Seven of the water bodies had less median total
phosphorus, one had less median dissolved phosphorus, five had
less median inorganic nitrogen, seven had less mean chlorophyll
a_, and all of the other water bodies had greater mean Secchi
disc transparency.
B. Rate-Limiting Nutrient:
The algal assay results show that Johnson Reservoir was phos-
phorus limited at the times the samples were collected (March
and September, 1974). The reservoir data also indicate phosphorus
limitation.
C. Nutrient Controllability:
1. Point sources—No known municipal point sources impacted
Johnson Reservoir during the sampling year; however, septic tanks
serving shoreline dwellings were estimated to have contributed 0.2%
of the total phosphorus load to the reservoir.
* See Appendix A.
-------
2
The present phosphorus loading of 6.72 g/m2/yr is nearly
four times that proposed by Vollenweider (Vollenweider and
Dillon, 1974) as a eutrophic loading (see page 11).
2. Non-point sources—The Tri County Supply Canal contrib-
uted an estimated 99.5% of the total phosphorus loading to
Johnson Reservoir during the sampling year.
The drainage area (watershed) of Johnson Reservoir is shown
as 0.0 km2 because it is an off-channel pumped-storage reser-
voir used primarily for power production, irrigation, and recre-
ation. Irrigation return flows probably would be high in nutri-
ents, and any significant reduction of the phosphorus input to
Johnson Lake would involve removal of phosphorus in these flows.
-------
II. LAKE AND DRAINAGE BASIN CHARACTERISTICS1"
A. Lake Morphometry :
1. Surface area: 11.53 kilometers2.
2. Mean depth: 6.1 meters.
3. Maximum depth: 18.0 meters.
4. Volume: 70.333 x 106 m3.
5. Mean hydraulic retention time: 27 days (based on outflow).
B. Tributary and Outlet:
(See Appendix C for flow data)
1. Tributaries -
Drainage Mean flow
Name area (km2)* (m3/sec)*
Tri County Supply Canal 0.0 33.37
Minor tributaries &
immediate drainage - 0.0 0.0
Totals 0.0 33.37
2. Outlet -
Tri County Supply Canal 0.0 29.65
C. Precipitation***:
1. Year of sampling: 52.3 centimeters.
2. Mean annual: 54.4 centimeters.
t Table of metric conversions—Appendix B.
tt Hartung, 1974; Adamovich, 1975.
* Pumped storage (Robertson, 1976).
** Includes area of reservoir.
*** See Working Paper No. 175.
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4
III. LAKE WATER QUALITY SUMMARY
Johnson Reservoir was sampled three times during the open-
water season of 1974 by means of a pontoon-equipped Huey helicopter.
Each time, samples for physical and chemical parameters were collected
from a number of depths at one station on the reservoir (see map,
page v). During each visit, a single depth-integrated (4.6 m to
surface) sample was collected for phytoplankton identification
and enumeration; and a similar sample was collected for chlorophyll
-------
A. SUMMARY OF PHYSICAL AND CHEMICAL CHARACTERISTICS FOR JOHNSON RESERVOIR
STORET CODE 3105
PARAMETER
TEMP
OISS OXY (M6/L)
CNDCTVY (MCROMO)
PH (STAND UNITS)
TOT ALK (MG/L)
TOT P (MG/L)
ORTHO P (MG/L)
N02«N03 (MG/L)
AMMONIA (MG/L)
KJEL H (MG/L)
INORG N (MG/L)
TOTAL N (MG/L)
CHLRPYL A (UG/L>
SECCHI (METERS)
1ST SAMPLING ( 4/16/74)
1 SITES
2ND SAMPLING ( 7/ 1/74)
1 SITES
3RD SAMPLING ( 9/30/74)
1 SITES
RANGE
7.8 - 8.5
10.6 - 11.4
719. - 729.
8.4 - 8.5
0.500
0.530
42.8
0.5
i ro.
~ 0.113
~ 0.010
- 0.520
- 1.100
- 0.550
~ 1.610
- 42.8
0.5
MEAN
8.2
11.1
725.
8.5
175.
0.009
0.510
0.035
0.545
1.360
42.8
0.5
MEDIAN RANGE MEAN MEDIAN
B. 3 21.9 - 22.1 22.0 22.0
11.4 6.4 - 8.8 7.2 6.8
727. 897. - 903. 900. 900.
8.5 8.2 - 8.4 8.3 8.4
0.510 »«<>»«« -«•«***»«•«*«•**«»*•**•
42.8 9.8 - 9.8 9.8 9.8
0.5 0.6 - 0.6 0.6 0.6
RANGE
14.7 - 14.7
8.4 - 8.8
629. - 722.
8.5 - 8.6
0.060
0.500
0. 130
0.560
25.8
0.6
- 0.070
~ 0.600
- 0.150
- 0.670
- 25.8
0.6
MEAN
14.7
8.6
653.
8.5
179»
0.065
0.575
0. 140
0.640
25.8
0.6
MEDIAN
14.7
8.7
630.
8.5
17V«
0*065
0.600
0.140
0.665
25.8
0.6
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B. Biological characteristics:
1. Phytoplankton -
Sampling
Date
04/16/74
07/01/74
09/30/74
2. Chlorophyll
Sampling
Date
04/16/74
07/01/74
09/30/74
Dominant
Genera
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
Stephanodiscus sp.
Asterionella sp.
Diatoma sp.
Chlamydomonas sp.
Surirella sp.
Other genera
Total
Fraj^ilaria sp.
Stephanodiscus sp.
Melosira ^p.
Aphanizomenon sp.
Synedra sp.
Other genera
Total
Melosira sp.
Stephanodiscus sp.
Aphanizomenon s£.
Oscillatoria SJD.
Anabaena sp.
Other genera
Algal Units
per ml
23,760
921
614
537
499
2,112
28,443
2,346
739
304
261
217
651
4,518
2,232
536
476
357
208
1,160
Total
Station
Number
1
1
1
4,969
Chlorophyll a
(ug/D
42.8
9.8
25.8
-------
C. Limiting Nutrient Study:
1. Autoclaved, filtered, and nutrient spiked -
a. April sample -
Spike (mg/1)
Control
0.005 P
0.050 P + 1.0 N
1.0 N
b. September sample -
Ortho P
Cone, (mg/1)
Inorganic N Maximum yield
Cone, (mg/1) (mg/1-dry wt.)
0.035
0.085
0.085
0.035
0.533
0.533
1.533
1.533
8.6
11.7
13.5
7.6
Spike (mg/1)
Control
0.050 P
0.050 P + 1.0 N
1.0 N
Ortho P
Cone, (mg/1)
0.005
0.055
0.055
0.005
Inorganic N Maximum yield
Cone, (mg/1) (mg/l-dry wt.)
0.122
0.122
1.122
1.122
0.2
4.3
9.6
0.2
2. Discussion -
The control yield of the assay alga, Selenastrum capri-
cornutum, indicates that the potential primary productivity
of Johnson Lake was high at the time the first assay sample
was collected (04/16/74) but was moderate at the time the
second sample was taken (09/30/74).
The algal assay results also show that Johnson Lake
was phosphorus limited at both sampling times. The addition
of orthophosphorus alone or in combination with nitrogen
resulted in significantly increased yields while the addition
of nitrogen alone did not.
The mean inorganic nitrogen/orthophosphorus ratios also
are indicative of phosphorus limitation; i.e., the N/P
ratios were 60/1 in April and 14/1 in September.
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8
IV. NUTRIENT LOADINGS
(See Appendix E for data)
For the determination of nutrient loadings, the Nebraska National
Guard collected monthly near-surface grab samples from each of the
tributary sites indicated on the map (page v), except for the months
of June and August when two samples were collected. Sampling was
begun in August, 1974, and was completed in August, 1975.
Through an interagency agreement, stream flow estimates for the
year of sampling and a "normalized" or average year were provided by
the Nebraska District Office of the U.S. Geological Survey for the
tributary sites nearest the reservoir.
In this report, nutrient loads for sampled tributaries were
determined by using a modification of a U.S. Geological Survey computer
program for calculating stream loadings*.
* See Working Paper No. 175.
-------
Waste Sources:
1. Known municipal -
Name
Pop.
Served
Treatment
Mean Flow
(mVd)
Johnson Lake ? stab, pond ?
2. Known industrial - None
Annual Total Phosphorus Loading - Average Year:
1. Inputs -
Source
kg P/
yr
a. Tributaries (non-point load) -
Tri County Supply Canal 77,095
b. Minor tributaries & immediate
drainage (non-point load) - None
c. Known municipal STP's - None
d. Septic tanks** - 165
e. Known industrial - None
f. Direct precipitation*** - 200
Total 77,460
2. Outputs -
52,295
3. Net annual P accumulation - 25,165 kg.
Lake outlet - Tri County
Supply Canal
Receiving
Water
no discharge*
% of
total
99.5
0.2
0^3
100.0
* Robertson, 1976.
** Estimate based on 574 shoreline dwellings; see Working Paper No. 175.
*** See Working Paper No. 175.
-------
10
C. Annual Total Nitrogen Loading - Average Year:
1. Inputs -
kg N/ % of
Source yr total
a. Tributaries (non-point load) -
Tri County Supply Canal 1,604,345 98.8
b. Minor tributaries & immediate
drainage (non-point load) - None
c. Known municipal STP's - None
d. Septic tanks* - 6,115 0.4
e. Known industrial - None
f. Direct precipitation** - 12.450 0.8
Total 1,622,910 100.0
2. Outputs -
Lake outlet - Tri County 1,172,080
Supply Canal
3. Net annual N accumulation - 450,830 kg.
* Estimate based on 574 shoreline dwellings; see Working'Paper No. 175.
** See Working Paper No. 175.
-------
11
D. Yearly Loads:
In the following table, the existing phosphorus loadings
are compared to those proposed by Vollenweider (Vollenweider
and Dillon, 1974). Essentially, his "dangerous" loading is
one at which the receiving water would become eutrophic or
remain eutrophic; his "permissible" loading is that which
would result in the receiving water remaining oligotrophic
or becoming oligotrophic if morphometry permitted. A meso-
trophic loading would be considered one between "dangerous"
and "permissible".
Note that Vollenweider's model may not be applicable to
water bodies with short hydraulic retention times.
Total Phosphorus Total Nitrogen
Total Accumulated Total Accumulated
grams/m2/yr 6.72 2.18 140.8 39.1
Vollenweider phosphorus loadings
(g/m*/yr) based on mean depth and mean
hydraulic retention time of Johnson Reservoir:
"Dangerous" (eutrophic loading) 1.70
"Permissible" (oligotrophic loading) 0.85
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12
V. LITERATURE REVIEWED
Adamovich, Ted, 1975. Personal communication (reservoir mor-
phometry). NE Dept. of Env. Contr., Lincoln.
Hartung, Ray, 1974. Personal communication (reservoir morphometry)
NE Dept. of Env. Contr., Lincoln.
Robertson, James, 1976. Personal communication (waste treatment
facilities around Johnson Lake; flow and drainage area).
Central NE Pub. Power and Irr. Dist., Holdrege.
Vollenweider, R. A., and P. J. Dillon, 1974. The application of
the phosphorus loading concept to eutrophication research.
Natl. Res. Council of Canada Publ. No. 13690, Canada Centre
for Inland Waters, Burlington, Ontario.
-------
VI. APPENDICES
APPENDIX A
LAKE RANKINGS
-------
LAKE DATA TO BE USED IN RANKINGS
LAKE
CODE LAKE NftME
3101 BRANCHED OAK
3102 HARLAN COUNTY RESERVOIR
3103 HARRY 0. STRUNK (ME01CIN
3104 HUGH BUTLER (RED KlLLO*)
3105 JOHNSON RESERVOIR
3,106 LAKE MCCONAUGHY
3107 PArfNEE LAKE
3108 SHERMAN COUNTY RESERVOIR
3110 SWANSON RESERVOIR
MEDIAN
TOTAL P
0.044
0.112
0.064
0.061
0.075
0.027
0.060
0.067
0.067
MEDIAN
INORG N
0.070
0.365
0.460
0.090
0.340
0.585
0.175
0.090
0.090
500-
MEAN SEC
456.444
476.111
470.500
468.675
477.667
40V. 555
453.000
451.167
466. J33
MEAN
CHLORA
17.033
27.822
14.367
16.61?
26.133
8.644
15.367
6.717
14.450
15-
MIN DO
9.400
12.200
14.200
14.400
8.600
11.400
8.800
11.800
11.000
MEDIAN
DISS ORThO P
0.013
0.061
0.009
0.014
O.OOsi
0.004
0.020
0.050
0.016
-------
PERCENT OF LAKES KITH HIGHER VALUES (NUMBER OF LAKES KITH HIGHEK VALUES)
CODt LAKE NAME
3101 BRANCHED OAK
3103 HARLAN COUNTY RESEKVOIK
3103 HARRY 0. STRUNK (MED1CIN
3104 HUGH BUTLER (RED WILLO*)
3105 JOHNSON RESERVOIR
3106 LAKE MCCONAUGHY
3107 PArfNEE LAKE
3108 SHERMAN COUNTY RESERVOIR
3110 SWANSON RESERVOIR
MEDUN
TOTAL P
86 (
0 (
50 (
63 (
13 (
100 (
75 (
38 (
25 (
7)
0)
4)
5)
1)
8>
6)
3)
2)
MEDIAN
INO*G
100 (
2$ (
13 (
75 (
38 (
0 (
50 (
75 (
75 (
N
8)
2>
1)
5)
3)
0)
4)
5>
5)
500-
MEAN SEC
63 (
13 (
25 (
36 (
0 (
100 (
75 (
88 (
50 (
5)
1)
2)
3)
0)
8)
6)
7)
4)
MEAN
CHLORA
25 (
0 (
75 (
38 (
13 (
88 (
50 (
100 (
63 (
2)
0)
6)
3>
1)
7)
4)
8)
5)
15-
MIN DO
75 (
25 (
13 (
0 (
100 (
50 (
88 (
38 (
63 (
6)
1)
0)
8)
4)
7)
3)
5)
ME U I AN
DISS OkTHO P
63 (
0 (
81 (
50 (
81 (
100 (
25 (
13 (
36 (
5)
0)
6)
4)
6)
8)
2)
1)
3)
1NOEX
NO
-------
LAKES RANKED BY INDEX NOS.
RANK LAKE CODE LAKE NAME INDEX NO
1 3106 LAKE MCCONAUGHY 438
-------
APPENDIX B
CONVERSION FACTORS
-------
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 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 C
TRIBUTARY FLOW DATA
-------
TRIBUTARY FLOW INFORMATION FOR NEBRASKA
12/23/75
LAKE CODE 3105
JOHNSON LAKE
TOTAL DRAINAGE AREA OF LAKE(SO KM)
0.0
SUB-DRAINAGE
TRIBUTARY AREA(SO KM)
3105A1
3105A2
3105ZZ
0.0
0.0
0.0
JAN
28. 74
28.63
0.0
FEB
32.42
32.76
0.0
MAR
34.40
34.43
0.0
APR
32.28
34.49
0.0
MAY
29.48
35.00
0.0
NORMALIZED FLOWS(CMS)
JUN JUL AUG
3105A2
8
9
10
11
12
1
2
3
4
5
6
7
8
9
8
9
10
11
12
1
2
3
4
5
6
7
8
9
74
74
74
74
74
75
75
75
75
75
75
75
75
75
74
74
74
74
74
75
75
75
75
75
75
75
75
75
MEAN FLOW
26.53
21.44
24.38
19.45
26.08
25.77
28.52
30.27
29.56
23.56
34.89
54.93
30.38
27.27
37.43
30.10
23.98
26.42
28.94
29.17
29.90
31.66
30.72
30.36
43.89
45.76
39.64
33.13
DAY
25
6
11
8
5
9
25
18
1
6
4
29
25
6
11
8
5
9
25
18
1
6
4
29
28.01
34.32
0.0
TOTAL DRAINAGE AREA OF LAKE =
SUM OF SUB-DRAINAGE AREAS '
NOTE «•• NO DRAINAGE AREAS. OFF CHANNEL STORAGE. CPUMPED)
MEAN MONTHLY FLOWS AND DAILY FLOWS(CMS)
TRIBUTARY MONTH YEAR
3105A1
0.0
0.0
FLOW
24.10
25.40
20.93
23.28
22.12
25.85
26.70
30.92
29.08
35.71
39.67
22.71
29.31
23.28
26.67
26.90
26.56
26.56
27.38
32.76
35.68
46.10
47.23
28.32
DAY
16
24
24
16
24
24
29.48
35.88
0.0
28.57
38.60
0.0
SEP
24.83
32.68
0.0
OCT
28.26
31.06
0.0
NOV
29.48
31.06
0.0
DEC
29.96
31.40
0.0
MEAN
29.65
33.37
0.0
SUMMARY
TOTAL FLOW IN
TOTAL FLOW OUT
756.23
756.23
FLOW DAY
19.20
48.56
27.16
26.08
42.62
36.90
FLOW
-------
APPENDIX D
PHYSICAL and CHEMICAL DATA
-------
STORET RETRIEVAL DATE 75/12/23
310501
40 41 00.0 099 55 00.0
JOHNSON RESERVOIR
38009 NEBRASKA
DATE
FROM
TO
74/04/16
74/07/01
74/09/30
TIME DEPTH
OF
DAY FEET
15
15
15
15
09
09
09
09
09
09
09
09
09
20 0000
20 0005
20 0015
20 0030
25 0000
25 0005
25 0015
25 0025
25 0030
35 0000
35 0005
35 0015
35 0025
00010
WATER
TEMP
CENT
8.5
8.5
8.2
7.8
22.1
22.0
22.0
22.0
21.9
14.7
14.7
14.7
14.7
11EPALES
00300
DO
MG/L
11.4
11.4
10.6
8.8
6.8
6.8
7.0
6.4
8.4
8.8
8.6
8.8
00077
TRANSP
SECCHI
INCHES
18
25
24
00094
CNDUCTVY
FIELD
MICROMHO
729
728
725
719
903
902
900
900
897
629
722
629
630
3
00400
PH
SU
8.55
8.50
8.45
8.40
8.20
8.40
8.40
8.30
8.40
8.50
8.50
8.60
8.50
2111202
0036 FEET DEPTH
00410
T ALK
CAC03
MG/L
176
175
174
173
178
178
179
179
00610
NH3-N
TOTAL
MG/L
0.040
0.030
0.030
0.040
0.070
0.070
0.080
0.080
00625
TOT KJEL
N
MG/L
1.100
0.800
0.800
0.700
0.600
0.500
0.600
0.600
00630
N02&N03
N-TOTAL
MG/L
0.510
0.520
0.500
0.510
0.070
0.060
0.070
0.060
00671
PHOS-OIS
ORTHO
MG/L P
0.010
0.009
0.009
0.010
0.014
0.009
0.008
0.008
00665
DATE TIME DEPTH PHOS-TOT
FROM OF
TO DAY FEET MG/L P
74/04/16 15 20 0000 0.104
15 ?0 0005 0.100
15 20 0015 0.108
15 20 0030 0.113
74/07/01 09 25 0000
09 25 0002
74/09/30 09 35 0000 0.051
09 35 0005 0.044
09 35 0015 0.049
09 35 0025 0.050
32217
CHLRPHYL
A
UG/L
42.8
9.8
25.8
00031
INCDT LT
REMNING
PERCENT
1.0
-------
APPENDIX E
TRIBUTARY DATA
-------
STORE! RETRIEVAL DATE 76/01/27
3105A1
40 41 30.0 099 49 48.0
TRICOUNTY SUPPLY CANAL
31 7.5 JOHNSON LAKE
O/JOHNSON LAKE
SEC «D BROG .9 M N OF JCT US HWY 283
11EPALES 2111204
4 0000 FEET DEPTH
DATE
FROM
TO
74/08/25
74/10/06
74/11/11
74/11/16
74/12/08
75/01/05
75/03/25
75/05/18
75/06/01
75/06/24
75/07/06
75/08/04
75/08/24
00630 00625
TIME DEPTH N02&N03 TOT KJEL
OF N-TOTAL N
DAY FEET
09
15
16
10
18
18
17
21
19
18
15
21
19
00
40
40
15
00
30
30
00
30
30
00
00
00
MG/L
0.056
0.060
0.089
0.090
0.184
0.352
0.655
0.010
0.015
0.090
0.230
0.055
0.085
MG/L
0.600
0.800
0.700
0.950
1.000
1.600
1.900
0.350
1.050
0.800
0.900
2.100
1.500
00610 00671 00665
NH3-N PHOS-DIS PHOS-TOT
TOTAL ORTHO
MG/L
0.060
0.045
0.035
0.050
0.035
0.072
0.042
0.030
0.318
0.185
0.080
0.100
0.057
MG/L P
0.015
0.010
0.010
0.005
0.010
0.020
0.082
0.025
0.015
0.037
0.020
0.010
0.010
MG/L P
0.040
0.050
0.060
0.040
0.030
OoOSO
OolJO
Oo030
0.040
0.080
0.065
0.040
0.080
-------
STORE! RETRIEVAL DATE 76/01/27
3105A2
40 41 45.0 099 52 42.0
TRICOUNTY SUPPLY CANAL
31 7.5 ELWOOO
T/JOHNSON LAKE
SEC »0 BROG 3.6 M NW OF JCT US HWY 283
11EPALES 2111204
4 0000 FEET DEPTH
DATE
FROM
TO
74/08/25
74/10/06
74/11/11
74/11/16
74/12/08
75/01/05
75/03/25
75/05/18
75/06/01
75/06/24
75/07/06
75/08/04
75/08/24
00630 00625
TIME DEPTH N02&N03 TOT KJEL
OF N-TOTAL N
DAY FEET
09
16
17
10
17
17
17
20
18
17
14
20
18
30
00
00
35
30
45
30
30
30
30
00
00
00
MG/L
0
0
0
0
0
0
0
0
0
0
0
0
0
.156
.100
.136
.144
.312
.600
.534
.005
.OOS
.315
.095
.210
.160
MG/L
0.800
1.000
0.500
1.000
1.000
2.100
2.500
1.150
1.450
2.400
0.800
1.300
1.150
00610 00671 00665
NH3-N PHOS-DIS PHOS-TOT
TOTAL ORTHO
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
030
025
025
035
092
456
040
020
220
270
130
057
040
MG/L
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
0.
P
015
040
010
005
015
040
082
050
010
055
030
015
010
MG/L P
0
0
0
0
0
0
0
0
0
0
0
0
0
.057
.055
.040
.050
.050
.050
.110
.070
.050
.140
.080
.080
.100
------- |