U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
REPORT
ON
LAKEVERRET
ASSUMPTION PARISH
LOUISIANA
EPA REGION VI
WORKING PAPER No,
CORVALLIS ENVIRONMENTAL RESEARCH LABORATORY - CORVALLIS, OREGON
and
ENVIRONMENTAL MONITORING & SUPPORT LABORATORY - LAS VEGAS, NEVADA
699-440
-------
REPORT
ON
LAKEVERRET
ASSUMPTION PARISH
LOUISIANA
EPA REGION VI
WORKING PAPER No,
WITH THE COOPERATION OF THE
LOUISIANA WILD LIFE AND FISHERIES COMMISSION
AND THE
LOUISIANA NATIONAL GUARD
MARCH, 1977
-------
REPORT ON LAKE VERRET
ASSUMPTION PARISH, LOUISIANA
EPA REGION VI
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
Con/all is, Oregon
Working Paper No. 544
OFFICE OF RESEARCH AND DEVELOPMENT
U.S. ENVIRONMENTAL PROTECTION AGENCY
March 1977
-------
CONTENTS
Page
Foreword ii
List of Louisiana Study Lakes iv
Lake and Drainage Area Map v
Sections
I. Introduction 1
II. Conclusions 2
III. Lake Characteristics 3
IV. Lake Water Quality Summary 4
V. Literature Reviewed 10
VI. Appendices 11
-------
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)], 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.
-------
m
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 refine-
ment 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 Louisiana Wild Life and
Fisheries Commission, Division of Water Pollution Control for
professional involvement, to the Louisiana National Guard for
conducting the tributary sampling phase of the Survey, and to
those Louisiana wastewater treatment plant operators who pro-
vided effluent samples and flow data.
Robert A. Lafleur, Chief; J. Dale Givens, Assistant Chief;
Lewis R. Still, Biologist; Louis Johnson, Biologist; Lee Cau-
barreaux, Biologist; Darrell Reed, Engineer; Dempsey Alford,
Biologist; and Elwood Goodwin, Water Quality Control Technician,
all of the Louisiana Wild Life and Fisheries Commission, Division
of Water Pollution Control reviewed the preliminary reports and
provided critiques most useful in the preparation of this
Working Paper Series.
Major General O'Neil Daigle, Jr., the Adjutant General of
Louisiana, and Project Officer Colonel Lawrence P. Dupre, who
directed the volunteer efforts of the Louisiana National Guards-
men, are also gratefully acknowledged for their assistance to
the Survey.
-------
IV
NATIONAL EUTROPHICATION SURVEY
STUDY LAKES
STATE OF LOUISIANA
LAKE NAME
Anacoco Lake
Lake Bistineau
Black Bayou
Black Lake
Bruin Lake
Bundick Lake
Caddo Lake
Cocodrfe Lake
Cocodrie Lake (Lower)
Concordia Lake
Cotile Lake
Cross Lake
D'Arbonne Lake
False River Lake
Indian Creek Reservoir
Saline Lake
Turkey Creek Lake
Lake Vernon
Lake Verret
PARISH
Vernon
Bienville, Webster
Caddo
Natchitoches and Red River
Tensas
Beauregard
Caddo (Menon and Harrison
in Texas)
Concordia
Rapides
Concordia
Rapides
Caddo
Union
Pointe Coupee
Rapides
LaSalle
Franklin
Vernon
Assumption
-------
<&>
Westfield
Brusle
St. Vincent
••^--iiir-. >•:-*:-*-<
\ 29'55'
--:• ..-*•
-'.*--: -*-
'*.': —
-t « r-^
La.
Map Location
LAKE
V&SftET
XO3
-_"•*:&•' -^="-"_-
•4- _1 -*.
-29" 50
LAKE VERRET
(S> Tributary Sampling Site
X Lake Sampling Site
ip Sewage Treatment Facility
°. 1 ? 3^ 4Kni.
o i 2 ^Mi.
"-•*•'-.."*••".: :l^-V.-.; • "-"-'• •--•*•' -*"**-> *r-r-3S'(
^'^---*--::>^; >::-:•-.^fes|r--77^-*--1
^s? *-:r-.*-.-«:-i. - O.---i^^i-:-*:^-
91 15
-------
REPORT ON LAKE VERRET, LOUISIANA
STORE! NO. 2216
I. INTRODUCTION
Lake Verret was included in the National Eutrophication Survey
(NES) as a water body of interest to the Louisiana Stream Control
Commission and the Louisiana Wild Life and Fisheries Commission.
Tributaries and nutrient sources were not sampled, and this report
relates only to the data obtained from lake sampling.
Lake Verret is located in Assumption Parish in southern
Louisiana. The clayey soils surrounding the lake are on alluvial
soils of the Mississippi River and are poorly drained swampland.
The lake is used extensively for fishing and other recreational
activities. However, shoreline development is minimal, with only
a few camps located on the south and west shores, and 'a large oil
and gas field to the east (Shampine, 1971).
Pesticides from sugar cane spraying and fertilizer runoff
entering the lake have been identified as a pollution problem in
Lake Verret (Ketelle and Uttormark, 1971); Shampine (1971) states
that some pollution from sugarmills along Bayou Lafourche and oil
field wastes also reach the lake. The Louisiana Wild Life and
Fisheries Commission (Michael Shurtz, personal communication) reports
drainage from an extensive cypress-tupelo gum swamp which surrounds
the lake is an additional nonpoint source of nutrients.
-------
II. CONCLUSIONS
A. Trophic Condition:*
Survey data indicate that Lake Verret is eutrophic,
i.e., nutrient rich and highly productive. Whether such
nutrient enrichment is to be considered beneficial or dele-
terious is determined by its actual or potential impact upon
designated beneficial water uses of the lake.
Of the 19 Louisiana lakes sampled in 1974, only 1 had
higher median total phosphorus or median orthophosphorus values,
and 9 had higher median inorganic nitrogen levels than Lake
Verret. Chlorophyll a_ levels were extremely high, ranging from
3.0 yg/1 in March to 197.9 yg/1 in May, with a mean of 62.0
yg/1. Secchi disc visibility was very low.
Field limnologists reported seeing duckweed (Lemna sp.) and
water hyacinths along 20% of the lake shoreline, and a heavy
algae bloom was reported on the November sampling date.
B. Rate-Limiting Nutrient:
The algal assay results were not considered representative
of conditions present in the lake at sampling times (03/21/74,
11/14/74) due to nutrient changes in the samples during shipment.
The lake data indicate nitrogen limitation in Lake Verret on all
four sampling occasions.
*See Appendix C.
-------
III. LAKE CHARACTERISTICS
A. Lake Morphometry:*
2
A. Surface area: 56.98 km .
B. Mean depth: 1.5 meters.
C. Maximum depth:** 5.2 meters.
D. Volume: 86.833 x 106 m3.
B. Precipitation:
A. Year of sampling: 142.8 cm.
B. Mean annual: 118.8 cm.
*Prbvided by the State of Louisiana.
**Shampine, 1971.
-------
IV. LAKE WATER QUALITY SUMMARY
Lake Verrett was sampled four 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 col-
lected from four stations on the lake (Station 02 was only sampled in
March and August) 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 chlorophyll ^analysis and phyto-
plankton identification and enumeration. During the first and last
visits, 18.9-liter depth-integrated samples were composited for algal
assays. Maximum depths sampled were 1.2 meters at Station 01, 0.6
meters at Station 02, 1.5 meters at Station 03, and 1.8 meters at
r^
Station 04. For a more detailed explanation of NES methods, see
NES Working Paper No. 175.
The results obtained are presented in full in Appendix B and
are summarized in IV-A for waters at the surface and at the maximum
depth for each site. Results of the phytoplankton counts and chloro-
phyll a_ determinations are included in IV-B. Results of the limiting
nutrient study are presented in IV-C.
-------
LAKE VERRET
?TOKET CODE 8216
PARAMETER
(DEG CKND
0.-1.5 M DEPTn
MAX OEPTH00
DISSOLVED OXYGEN IMG/L)
0.-1.5 M DEPTM
MAX UECTH«»
CONDUCTIVITY (UMHOS
0.-1.5 M DEPTH
MAX DEPTH**
Ph (STANDARD UNITS)
0.-1.5 M DEPTH
MAX DEPTH**
TOTAL ALKALINITY (MG/L)
O.-l.S M DEPTH
MAX DEPTH**
TOTAL P (MG/L)
0.-1.5 M DEPTH
MAX DEPTHoo
DISSOLVED ORTHO P (MG/L)
O.-l.b M DEPTH
DEPTH'*
N02»N03 (MG/L)
O.-l.S M OE^TH
MAX DEPTH**
AMMONIA (MG/L>
0.-1.5 N! OEPTH
MAX LlEPTH<»<>
KJEL06HL M (M(j/L)
O.-l.b M DE»TH
MAX
PHYSICAL AND CHEMICAL CHARACTERISTICS
SECCHI DISC («ETtRS>
N«
5
4
)
4
4
5
4
5
*
)
S
*
5
4
'D
5
4
5
4
b
4
5
4
4
( 3
5000
RANGE
21.3- 22.6
21.3- 22.6
3.0- 7.d
3.0- 7.8
22*.- 2**.
22*.- 24*.
7.1- 8.1
7.1- 8.1
80.- 100.
80.- 100.
0.107-0.186
0.107-0.186
0.036-0.075
0.036-0.075
0.050-0.070
0.050-0.070
0.0*0-0.0*0
0.0*0-0.040
0. 700-0.900
0.700-0.900
0.3- O.s«
/21/74 )
= 4
MEDIAN
21. d
21. 6
6.9
6.9
230.
235.
7.v
7.b
93.
94.
0.127
0.133
0.048
0.056
0.06U
0.060
0.040
U.040
0.800
0.300
0.*
"AX
DEPTH
RANoE
(METERS) N*
0.0-
0.0-
0.0-
n.o-
0.0-
0.0-
0.0-
0.0-
0.0-
0.0-
.1.0-
o.o-
0.0-
0.0-
0.0-
0.0-
0.0-
0.0-
0.0-
0.0-
l.b
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
l.b
1.5
1.5
1.5
l.b
1.5
5
3
2
3
5
3
5
3
5
3
5
3
5
3
b
3
5
3
5
3
3
( 5/29/74 ]
5000 = 3
RANGE MEDIAN
27.9- 28. b
27.5- 28.0
7.0- 6.0
7.0- 8.0
253.- 260.
253.- 254.
9.4- 9.S
9.. 060-0. 130
0.040-0. 100
0.050-0.100
1.200-1.600
1.200-1.300
0.5- 0.5
27.9
27.9
7.5
7.4
254.
25*.
9.4
9.4
7fl.
76.
0.1*5
0.147,
0.0«>9
0.068
0.100
0.080
0.070
0.060
1.300
1.200
0.5
1
MAX
DEPTH
RANGE
(METERS)
0.0-
1.2-
1.2-
1.2-
0.0-
1.2-
0.0-
1.2-
0.0-
1.2-
0.0-
1.2-
0.0-
1.2-
0.0-
1.2-
0.0-
1.2-
0.0-
1.2-
1.5
1.8
1.5
1.8
1.5
l.b
1.5
1.8
1.5
1.8
1.5
1.8
1.5
1.8
1.5
l.S
1.5
1.8
1.5
1.8
( 8/21/74 )
MAX
S«oo = 4 DEPTH
RANGE
N» RANGE MEDIAN (METERS)
7 ?b. 5- 30.3
* 2S.5- 30.1
7 4.0- 7.2
4 4.0- 7.2
7 239.- 311.
4 239.- 311.
7 7.4- 9.6
* 7.4- 9.6
J Oi>OOO_OOOOO
Q OOO0O-00OO0
0 ooooo-ooooo
Q 000OO.OOOOO
0 00000-00000
0 ooooo-ooaoo
Q eoooo.ooooo
0 ooooo.ooooo
Q OOO0O-OOOOO
0 ooooo-ooooo
0 eoooo-ooooo
4 0.3- 0.5
29.7 0.0- 0.9
29.5 0.0- 0.9
S.d 0.0- 0.9
6.4 0.0- 0.9
240. 0.0- 0.9
243. 0.0- 0.9
8.8 0.0- 0.9
8.2 0.0- 0.9
000*0 0000.00000
OOOOO 0000.00000
OOO0O OOOO-OOOOO
00000 0000.00000
00000 0000.00000
OOOOO OOOO.OOOOO
ooooo oooo-ooooo
oeooo oooo-ooooo
OOOOO 0000.00000
ooooo oooo.oooeo
OOOOO OOOO.OOOOO
OOOOO OOOO.OOOOO
0.5
« N = NO. OF SAMPLtS
»» MAXIMUM UEt-TH SAMPLED AT EACH SITE
«oo S = IvO. Or SITES SAMPLfc.0 OiM THIS DATE
-------
LAKE VERRET
STORE? COPF 2316
PHYSICAL AND CHEMICAL CHARACTERISTICS
PA4A*
O.-l.S M DEPTH
MAX DEPTn»«
TOTAL P (MG/L)
O.-l.S M DEPTH
MAX DEPTH**
6
3
6
3
93.-
93.-
O.lh3-0
0.163-0
97.
96.
.201
.1
O.-l.S M DEPTH
MAX DEPTH**
N02*N03 (MG/L)
O.-l.S M DEPTH
MAX Ofc'PT.l**
AMMONIA (MG/L)
O.-l.S M OEPTn
MA» DEPTH**
KJELDAHL N (MG/L)
O.-l.S M OEPTH
MAX DEPTH**
6
3
6
3
6
J
b
3
0.032-0
0.037-0
0.020-0
0.020-0
0.030-0
0.030-0
1.100-1
1.100-1
.056
.051
.050
.050
.0*0
.0*0
.500
.500
0.038
0.03*
U.030
0.030
0.035
0.030
1.300
1.200
0
0
0
0
0
0
0
0
.0-
.9-
.0-
.9-
.0-
.9-
.0-
.9-
1
1
1
1
1
1
1
1
.5
.5
.5.
.5
.5
.5
.5
.5
SECCHI
(MtTEP.S)
0.5- 0.6
0.5
* N = NO. 0^ SAMPLtS
»» MAXIMUM DETH bAhKLto AT EACH s
»»» S = NO. Or SITES SAMPLED ON THIS DATE
-------
B. Biological Characteristics:
1. Phytoplankton -
Sampling
Date
03/21/74
OB/29/7
08/21/74
Dominant
Genera
1. Pennate diatom
2. Flagellates
3. Ankistrodesmus
4. Scenedesmus
5. Lyngbya
Other genera
Total
1.
2.
3.
4.
5.
Oscillatoria
Dactylococcopsis
Anabaenopsis
Nitzschia
Ankistrodesmus
1.
2.
3.
4.
5.
Other genera
Total
Oscillatoria
Lyngbya
Raphidiopsis
Anabaenopsis
Centric diatom
Other genera
Total
Algal
Units
per ml
4,541
1,904
1,099
879
366
623
9,412
93,324
17,742
4,436
3,283
2,306
13,129
134,220
68,499
20,338
9,600
4,882
3,091
19,198
125,608
-------
2. Chlorophyll i -
Sampling Station Chlorophyll
Date Number (yg/1)
03/21/74 01 3.0
02 11.6
03 13.3
04 15.8
05/29/74 01 21 2
02
03 75.8
04 197.9
08/21/74 01 42.7
02 117.7
03 131.9
04 76.7
11/W74 01 56.8
02 ' — .
03 45.3
04 58.7
-------
C. Limiting Nutrient Study:
The assay algal results are not considered representative
of conditions present in the lake at the time the samples were
taken (03/21/74, 11/14/74) due to significant changes in nutrient
concentrations in the samples during shipment and pre-assay storage.
However, inorganic nitrogen to orthophosphorus ratios (N/P) in the
lake data were 3/1 or less on all sampling occasions, indicating
Lake Verret to be nitrogen limited. (An N/P ratio of 14/1 or
greater is generally considered necessary for phosphorus limitation
to occur). The low N/P ratios are a result of excessively high
orthophosphorus levels in the lake.
-------
10
V. LITERATURE REVIEWED
Ketelle, Martha J. and Paul D. Uttormark. 1971. Problem Lakes in
the United States. U.S. Environmental Protection Agency Project
#16010 EHR. University of Wisconsin, Wisconsin.
Schurtz, Michael H. 1977. Personal Communication (Water Quality
of Lake Verret). Louisiana Wild Life and Fisheries Commission,
Division of Water Pollution Control, Baton Rouge, Louisiana.
Shampine, W. J. 1971. Chemical, Biological and Physical Data for
the Major Lakes and Reservoirs in Louisiana. Louisiana Department
of Public Works, #5. Baton Rouge, Louisiana.
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, Con/all is, Oregon.
-------
11
VI. APPENDICES
APPENDIX A
CONVERSION FACTORS
-------
CONVERSION FACTORS
Hectares x 2.471 = acres
Kilometers x 0.6214 = miles
Meters x 3.281 = feet
-4
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 B
PHYSICAL AND CHEMICAL DATA
-------
STOkET KETtflEvAL 0&TE 75/12/11
NATL EUT*OP.~lICATIOu SURVEY
EPA-LAS >/FGAS
321601
29 56 38.0 001 11
22
LOUISIANA
DATE
FSOM
TO
74/03/21
74/05/29
74/08/21
74/11/1*
DATE
FKOV<
TO
74/03/21
74/05/29
74/08/21
74/11/14
T I ,'-•
OF
[)AY
10
09
09
09
on
08
E DEPT*
15
40
40
50
45
45
TIME
OF
DAY
10
09
09
09
09
09
08
08
15
40
40
40
50
SO
45
45
FEET
GOOD
0000
0004
0000
0000
0004
DEPTH
FEET
0000
0000
0001
000*
0000
000?
0000
0004
00010
*6TtR
T£MH
CENT
21.8
28.5
28.0
29.4
16.0
16.0
00665
PriOS-TOT
MG/L H
0.139
0.191
0.1H2
0.201
0.194
00300
DO
MG/L
3.
7.
7.
8.
a.
32217
ll.EHai.ES 2111202
3 000^ KEET Ot^TH
00077 00094 0040U 00410 00610 U0fc2t> 00630 00671
TRAtxiSP CNiOUCTVY PH T AL»^ NM3-N TOT *JEL NO-Pf-NOa ^HOS-DIS
SECCHI FIELD CAC03 TOTAL N N-TOTAL 0>*THO
0
0
2
U
0
CHLrtPHYL
A
UG/L
3.
21.
42.
56.
0
2
7
8
INCHES MICROMHO SU
35 240 7.10
20 254 9.50
253 9.40
18 311 7.56
18 259 7.98
256 7.78
00031
INCDT Lf
PENNING
PERCENT
50.0
1.0
1.0
MG/L MG/L MG/L MG/L MG/L P
93 0.040 0.700 0.050 0.075
78 0.080 . l.MiC 0.110 0.074
75 0.100 1.200 0.130 0.068
95 0.040 1.200 O.OJO O.OS6
95 0.030 1.100 0.030 0.037
-------
STQRET RETRIEVAL 04TE 7b/12/ll
NATL F.UTwOPnICATIG.>. SUrrvEY
EPA-LAS VEGAS
221602
9 55 37.0 091 li 1
vERWET
LOUISIANA
211121*
0006 FEET
00010 00300 00077
DATE TI'-'E DEPTf \«ATE* 00
FROM OF Tfc.MP
TO DAY FEET CtNT MG/L INCHES
74/03/21 10 25 0000 22.6 7.2 12
74/08/21 09 30 0000 28.5 4.8 18
09 30 0002 28.5 4.0
00094
ClxiOUCTVY
FIELD
MIC»OMHO
00400
Ph
Sir
00410
T ALK
CACOJ
MG/L
00610
NMJ-N
TOTAL
MG/L
00fr?s
TOT KJEL
N
MG/L
00630
N02S.N03
N-TOTAL
MG/L
00o71
PHOS-DIS
ORTHO
MG/L t»
244
246
246
7.80
7.41
100
0.040
0.800
0.070
0.069
DATE
00665 32217 00031
TIME DEPTH PriOS-TOT CHLRPriYL INCUT LT
OF A SEKNli^G
TO DAY FEET MG/L P Ui3/L PEKCENT
74/03/21 10 25 0000
74/06/21 09 30 0000
09 30 0003
0. 186
11.6
117.7
i.o
-------
STGPET RETRIEVAL DATE 75/12/11
NATL FUTROPnICATION S
EPA-LAS VEGAS
221603
29 52 13.0 091 0') 31.0
LAivE VEH9ET
2? LOUISIANA
00010
DATE
FPQM
TO
74/03/21
74/05/29
74/08/21
74/11/14
Tl^E DEPTH y
OF
OAY FEET
14
14
09
09
10
10
09
09
35
35
55
55
10
10
10
10
0000
0005
0000
0005
0000
0003
0000
ooo=s
TEMP
CENT
21.3
21.3
27.9
27.9
29.7
29.7
15.8
lb.8
00300
DO
MG/L
6.6
8.0
5.8
5.6
9.0
9.8
00077
TKUNbP
StCChI
iNCHtS
15
20
18
16
00094
CNDUCTVY
FIELD
MICHOMHO
230
229
254
254
239
239
25?
257
11EPALES
3
00400
Pr<
50
7.90
7.90
9.50
9.40
8.67
8.85
ft ,f-0
e.56
00410
T ALK
CAC03
MCVL
84
80
79
76
93
93
211
0010
00610
Nr!3-N
TOTAL
MG/L
0.040
0.040
0.040
0.050
0.040
0.040
1202
FEET OE-TH
i)Of-?5
TOT *JtL
N
MG/L
0.800
O.HOO
1.300
1.200
1.400
1.400
00630
N02J.N03
N-TOTAL
MG/L
0.070
0.060
0.050
o.Ofso
n.oaox
0.020K
00671
0HOS-DIS
0*THO
MG/L »'
0.048
0.044
0.071
0.069
0.03?
0.051
DATE
FROM
TO
74/03/21
74/05/29
74/08/21
74/11/14
TIME DEPTH
OF
OAY FEET
14 35 0000
14 35 0005
09 55 0000
09 55 0001
09 55 0004
09 55 0005
10 10 0000
10 10 0003
09 10 0000
09 10 OOO^i
00665
PHOS-TOT
MG/L P
0.126
0.127
0.137
0.143
0.177
U.l«8
32217
CHLRPHYL
A
UG/L
13.3
75.8
131.9
45.3
00031
INCDT LT
REKNING
PEKCENT
50.0
1.0
1.0
K VALUE KNOWN TO BE LESS THAN
INDICATED
-------
STOJ=.T "ETrMtVAL J^Tr.
NATt t'UTSfiPnlCAT ION bi_Nv'tY
tf-A-LA5 VEGAS
221604
89 49 30.0 091 06 13.
LOUISIANA
DATE
FPO'-1
TO
74/03/21
74/05/2^
74/OH/21
74/11/14
DATE
FRO*
TO
74/03/21
74/05/29
74/06/21
74/11/14
TI--.E OEPT--
UF
OAr FEET
10 fcS 0000
10 10 OOOn
10 10 0006
10 30 0000
10 30 0003
09 50 0000
09 50 0003
TIME DEPTH
OF'
DAY FEET
10. 55 0000
10 10 0000
10 10 0006
10 30 0000
10 30 0003
09 50 0000
09 50 0003
00010
-Alt"
TEMP
CENT
21.9
27.9
27.5
30.3
30.1
16.7
16.7
0066S
PhOb-TOT
MG/L f
0.107
0.145
0.147
0.167
0.163
1)0300
00
Wfi/L
7.8
7.4
6.6
7.2
9.8
8.6
32217
CHLKPHYL
A
UbVL
15.6
197.9
76.7
58.7
i'i n o 7 7
Th4i\iSP
StCCiI
iNCHtS
14
16
12
24
00031
INGOT LT
P.EMNING
PEKCEMT
1.0
00094
OiDuCTVY
FIELD
224
260
254
240
2*0
270
272
i IE^ALES 2111202
3
004QU
H>H
SU
£.10
9.40
9.20
9.60
9.60
8.19
H.U
00410
T ALi1"
CACOJ
Mb/L
95
7d
•U
97
96
0006
00610
NrtJ-N
iui AL
MG/L
0.040
0.070
0.060
0.0 JO
0.030
KEtT l;E-
UQ6i-
TOT KjtL
N
MG/L
0.^00
1 . 100
1 .JdO
1 .400
1 .200
Tn
'I0610
NO?sN03
Ni-TOTAL
M&/L
0.060
0.100
0.080
0.050
0.050
00fi71
MG/L
0.036
0.066
0.060
0.03H
0.031*
-------
APPENDIX C
PARAMETRIC RANKINGS OF LAKES
SAMPLED BY NES IN 1974
STATE OF LOUISIANA
-------
LAKE DATA TO 9C USED IN RANKINGS
LAKE
CODE
2201
2202
2203
2204
2205
2207
2208
2204
2210
2211
2212
2213
2214
2215
2216
2217
2219
2220
4807
LAKE NAME
ANACOCO LAKE
BPUIN LAKE
LAKE BISTINE&0
BLACK BAYOU
8UNOICK LAKE
COCODSIE LAKE
COTILE LAKE
CONCOKDIA LAKE
CROSS LAKE
D'ARBONNE LAKE
FALSE RIVER LAKE
INDIAN CREEK
SALINE LAKE
TURKEY CREEK LAKE
LAKE VERRET
LAKE VERNON
BLACK LAKE
COCODRIE
CADDO LAKE
MEDIAN
TOTAL P
n
0
0
0
0
0
0
0
0
0
0
0
0
n
0
0
0
0
0
."31
.057
.061
.046
.157
.090
.037
. I7b
.057
.038
.062
.031
.111
.176
.163
.018
.077
.106
.049
MEDIAN
INORG N
0.080
0.250
0.100
0.090
0.135
0.400
0.100
0.080
0.080
0.100
0.130
0.150
0.350
0.170
0.100
0.120
0.150
0.050
0.070
500-
MEAN SEC
455.
450.
458.
453.
469.
479.
442.
468.
475.
45H.
442.
458.
493.
477.
481.
436.
454.
478.
463.
833
333
000
417
667
000
333
333
250
250
500
333
000
833
428
667
000
333
562
MEAN
CHLORA
8
16
12
17
20
35
12
32
38
6
24
21
15
21
62
4
12
33
20
.700
.350
.933
.818
.467
.300
.650
.950
.38b
.800
.550
.4t>7
.333
.967
.028
.900
.733
.433
.125
15-
MIN oo
10
15
13
12
10
7
14
14
11
13
14
14
9
14
12
14
11
11
10
.400
.000
.200
.200
.600
.700
.000
.800
.400
.200
.900
.800
.600
.600
.000
.400
.600
.600
.000
MEDIAN
UISS ORTHO P
0.007
0.012
0.018
0.000
0.073
0.026
0.011
0.009
0.010
0.011
0.023
0.010
0.025
0.033
0.05ft
0.007
0.015
0.014
0.008
-------
PERCENT OF LAKES wITH HIGHER VALUES (NUM8FR OF LAKES WITH HIGHER VALUES)
LAKE
CODE LAKE NAME
3201 ANACOCO LAKE
2202 BRUIN
2203 LAKE
2204 BLACK BAYOU
2205 BUNOICK LAKE
2207 COCODHIE LAKE
220ti COTILE LAKE
2209 CONCOKDIA LAKE
2210 CROSS LAKE
2211 D'ARBONNE LAKE
2212 FALSE RIVER LAKE
2213 INDIAN CREEK
2214 SALINE LAKE
2215 TURKEY CREEK LAKE
2216 LAKE VERRET
2217 LAKE VERNON
22i«> BLACK LAKE
2220 COCOORIE
4807 CAOOO LAKE
MEDIAN
TOTAL P
92 (
61 (
sn (
72 (
11 (
28 (
83 (
44 (
56 (
78 (
33 t
92 (
17 (
0 (
6 (
100 (
39 (
22 (
67 (
16)
11)
9)
13)
2)
5)
15)
8)
10)
14)
6)
16)
3)
0)
1)
18)
7)
4)
12)
MEDIAN
INOH6 N
a3 (
ll (
58 (
72 (
33 (
0 (
58 (
83 (
83 (
58 (
39 (
28 (
6 (
17 (
58 (
44 (
22 (
100 (
94 (
14)
2)
9)
13)
6)
0)
9)
14)
14)
9)
7)
5)
1)
3)
9)
8)
4)
18)
17)
500-
*EAN SEC
67
83
11
78
33
11
94
39
28
56
89
50
0
22
6
100
72
17
44
( 12)
( 15)
( 11)
( 14)
( 6)
( . 2)
( 17)
( 7)
( 5)
( 10)
( 16)
( 9)
( 0)
( 4)
( 1)
( 18)
( 13)
( 3)
( 8)
MEAN
CHLOWA
89 (
61 (
72 (
56 (
44 (
11 (
83 (
22 (
6 (
94 (
28 (
39 (
67 (
33 (
0 (
100 (
78 (
17 {
50 (
16)
11)
13)
10)
8)
2)
15)
4)
1)
17)
5)
7)
12)
6)
0)
18)
14)
3)
9)
15-
MIN DO
83
0
42
50
78
100
33
14
72
42
6
14
94
22
56
28
67
61
89
( 15)
( 0)
( 7)
( 9)
( 14)
( 18)
( 6)
( 2)
( 13)
< 7)
( 1)
( 2)
( 17)
( 4)
( 10)
( 5)
( 12)
( 11)
( 16)
MEDIAE
DISS ORThO P
9*
50
33
81
0
17
61
81
69
56
28
69
22
11
6
100
39
44
89
( 17)
( 9)
( M
( 14)
( 0)
( 3)
( 11)
( 14)
< 12)
( 10)
( 5)
( 1?)
( 4)
( ?)
( 1)
( 18)
t 7)
( 8)
( 1ft)
------- |