U.S. ENVIRONMENTAL PROTECTION AGENCY
NATIONAL EUTROPHICATION SURVEY
WORKING PAPER SERIES
PACIFIC NORTHWEST ENVIRONMENTAL RESEARCH LABORATORY
An Associate Laboratory of the
NATIONAL ENVIRONMENTAL RESEARCH CENTER - CORVALLIS, OREGON
and
NATIONAL ENVIRONMENTAL RESEARCH CENTER - LAS VEGAS, NEVADA
•&GPO 697-032
-------
REPORT
ON
JOHNSON POND
WICOMICO COUNTY
MARYLAND
EPA REGION III
WORKING PAPER No, 356
WITH THE COOPERATION OF THE
MARYLAND DEPARTMENT OF NATURAL RESOURCES,
MARYLAND DEPARTMENT OF HEALTH AND MENTAL HYGIENE,
AND THE
MARYLAND NATIONAL GUARD
JUNE, 1975
-------
REPORT ON JOHNSON POND
WICOMICO COUNTY, MARYLAND, EPA REGION III
by
National Eutrophication Survey
Water and Land Monitoring Branch
Monitoring Applications Laboratory
National Environmental Research Center
Las Vegas, Nevada
and
Eutrophication Survey Branch
Pacific Northwest Environmental Research Laboratory
National Environmental Research Center
Con/all is, Oregon
Working Paper No. 356
OFFICE OF RESEARCH AND DEVELOPMENT
U.S. ENVIRONMENTAL PROTECTION AGENCY
June 1975
-------
CONTENTS
Page
Foreword i i
List of Maryland Study Lakes 1v
Lake and Drainage Area Map v
Sections
I. Conclusions 1
II. Lake and Drainage Basin Characteristics 3
III. Lake Water Quality Summary 5
IV. Nutrient Loadings 9
V. Literature Reviewed 14
VI. Appendices 15
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11
FOREWORD
The National Eutrophication Survey was initiated in 1972
in response to an Administration commitment to investigate the
nationwide 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 nonpoint 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
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
-------
iii
planning [§303(e)L water quality criteria/standards review
[§303(c)], clean lakes [§314(a,bj], and water quality monitoring
[§106 and §305(b)] activities mandated by the Federal Water
Pollution Control Act Amendments of 1972.
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.
ACKNOWLEDGMENTS
The staff of the National Eutrophication Survey (Office of Research
and Development, U.S. Environmental Protection Agency) expresses sincere
appreciation to the Maryland Department of Natural Resources and the
Maryland Department of Health and Mental Hygiene for professional involve-
ment and to the Maryland National Guard for conducting the tributary
sampling phase of the Survey.
Paul W. Slunt, Chief, Water Quality Services, James T. Allison,
Natural Resources Manager, Water Quality Services, of the Maryland
Department of Natural Resources, and Earl S. Quance, Chief, Division
of Water and Sewerage, Maryland Department of Health and Mental Hygiene
provided invaluable lake documentation and counsel during the course of
the Survey.
Major General Edwin Warfield III, the Adjutant General of Maryland,
and Project Officer Colonel Bernard Feingold, who directed the volunteer
efforts of the Maryland National Guardsmen, are also gratefully acknowl-
edged for their assistance to the Survey.
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iv
NATIONAL EUTROPHICATION SURVEY
STUDY LAKES
STATE OF MARYLAND
LAKE NAME COUNTY
Deep Creek Lake Garrett
Liberty Reservoir Carroll, Baltimore
Loch Raven Reservoir Baltimore
Johnson Pond Wicomico
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75' 36'
75 34'
75^32'
DELAWARE ( /
MARYLAND ~ Tj
\J
JOHNSON POND
® Tributary Sampling Site
x Lake Sampling Site
• Sewage Treatment Facility
jKm.
3828 —
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JOHNSON POND
STORE! NO. 2409
I. CONCLUSIONS
A. Trophic Condition*:
Johnson Pond is considered eutrophic based upon field
observations and analysis of survey data. Rooted and floating
aquatic vegetation was observed during the fall sampling with
no visible algal blooms. The water clarity was low and pre-
sented a green turbid appearance. Phytoplankton genera
identified were mostly pollution-tolerant forms. Chlorophyll a_
levels ranged from a low of 2.6 micrograms/liter in the spring,
to a high level of 69.1 micrograms/liter in the summer. The
algal assay control yield results indicate a high potential for
primary productivity. The pond is characterized by high con-
centrations of inorganic nitrogen and dissolved phosphorus.
B. Rate-Limiting Nutrient:
Algal assay results indicate that Johnson Pond was limited
by available phosphorus levels. Spikes with phosphorus, and
nitrogen and phosphorus simultaneously result in increases in
assay yield. Additions of nitrogen alone did not stimulate
a growth response. The ratio of available nitrogen to dissolved
phosphorus in sampled waters substantiates phosphorus limitation.
* See Appendix E
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C. Nutrient Controllability:
1. Point sources -
The mean annual phosphorus load from point sources was
estimated to be 29.1% of the total load reaching Johnson
Pond. The city of Delmar wastewater treatment plant
contributed 18.6% while Purdue Inc. contributed 10.5% of
the total phosphorus load.
The loading rate of 20.81 g/m2/yr is over nine times
higher than the proposed "dangerous" levels by Vollenweider
(in press) and it is over 18.5 times higher than the
"permissible" proposed rate. Total elimination of known
point sources of phosphorus is not likely to result in a
depression of loading values to below Vollenweider's
"dangerous" levels.
2. Nonpoint sources -
Nonpoint sources contributed 70.9% of the phosphorus
loading reaching Johnson Pond. Measured tributaries
accounted for 66% of the total phosphorus load and the
ungaged tributaries accounted for 4.9% of the load.
The calculations of loading based upon available
nutrient concentrations and flow data indicate a net
export of nitrogen from Johnson Pond, suggesting that
the tributary sampling was perhaps inadequate to depict
actual loading and export rate for that nutrient.
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II. LAKE AND DRAINAGE BASIN CHARACTERISTICS
Lake and drainage basin characteristics are itemized below.
Lake surface area, mean and maximum depths were provided by the
State of Maryland; tributary data were provided by the Maryland
District Office of the U.S. Geological Survey (USGS) (outlet
drainage area includes the lake surface area). Mean hydraulic
retention time was obtained by dividing the lake volume by the
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 D.
A. Lake Morphemetry:
1. Surface area: 0.42 km2.
2. Mean depth: 2.1 meters.
3. Maximum depth: 6.1 meters.
4. Volume: 0.884 x 106 m3.
5. Mean hydraulic retention time: 5.4 days.
B. Tributary and Outlet (see Appendix A for flow data)
1. Tributaries -
Drainage Mean flow
Name area(km2) (nr/sec)
A(2) Wicomico River 67.9 1.4
B(l) Brewington Branch 10.4 0.1
C(l) Middle Neck Branch 14.6 0.3
Minor tributaries &
immediate drainage - 2.8 0.1
Totals 95.7 1.9
-------
Drainage Mean flow
area(km2) (m3/sec)
2. Outlet - A(l) Wicomico River 96.1 1.9
C. Precipitation:
1. Year of sampling: 115.7 centimeters.
2. Mean annual: 145.5 centimeters.
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III. LAKE WATER QUALITY SUMMARY
Johnson Pond was sampled three times during the open-water
season of 1973 by means of a pontoon-equipped Huey helicopter.
Each time, samples for physical and chemical parameters were
collected from two stations on the lake and from a number of
depths at each station (see map, page v). During each visit,
depth-integrated samples were collected from each station for
chlorophyll a_ analysis and phytoplankton identification and
enumeration. During the first visit, 18.9-liter depth-integrated
samples were composited for algal assays. Maximum depths sampled
were 1.8 meters at Station 1, and the surface at Station 2. 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 III A for waters at the surface and at the
maximum depth for each site. Results of the phytoplankton counts
and chlorophyll a^ determinations are included in III B. Results
of the limiting nutrient study are presented in III C.
-------
PARAMETER
TEMP (C)
DISS OXY (MG/L)
CNDCTVY (MCROMO)
PH (STAND UNITS)
TOT ALK
-------
B. Biological Characteristics:
1. Phytoplankton -
Sampling
Date
04/10/73
07/20/73
09/28/73
Dominant
Genera
1. Flagellates
2. Fragilaria
3. Melosira
4. Synedra
5. Scenedesmus
Other genera
Total
1. Flagellates
2. Microcystis
3. Phormidium
4. Oscillatoria
5. Ankistrodesmus
Other genera
Total
1. Flagellates
2. Cryptomonas
3. Melosira
4. Microcystis
5. Phormidium
Other genera
Total
Algal Units
per ml
403
77
76
38
19
114
727
683
518
448
424
377
2.257
4,707
2,168
1,174
569
178
178
286
4,553
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c.
2. Chlorophyll a_ -
Sampling
Date
04/10/73
Station
Number
1
2
1
1
07/20/73
09/28/73
Limiting Nutrient Study:
1. Autoclaved, filtered, and nutrient spiked -
Chlorophyll a_
(micrograms/liter)
3.0
2.6
69.1
30.2
Ortho P
Cone, (mg/1)
Inorganic N
Cone, (mg/1)
Maximum yield
(mg/1-dry wt.)
Control
0.05 P
0.05 P + 1.0 N
1.00 N
0.044
0.094
0.094
0.044
0.97
0.97
1.97
1.97
10.7
20.3
40.0
9.5
Spike (mg/1)
Control
0.05 P
0.05 P + 1.0
1.00 N
Discussion -
The results of the algal assay with Selenastrum capri-
corntum indicate that Johnson Pond was growth limited by
phosphorus at the time of sample analysis. Simultaneous
addition of nitrogen and phosphorus spikes produced a
substantial increase in yield over the addition of phos-
phorus alone. No growth response accompanied spikes of
nitrogen alone.
The ratio of inorganic nitrogen to dissolved phosphorus
in the field samples was about 33:1 indicating the lake was
phosphorus limited at the time of assay sample collection.
The high control yield of the test alga indicates high
potential primary productivity.
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IV. NUTRIENT LOADINGS
(See Appendix C for data)
For the determination of nutrient loadings, the Maryland
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 February and March when two samples
were collected. Sampling was begun in May 1973, and was completed
in May 1974.
Through an interagency agreement, stream flow estimates for
the year of sampling and a "normalized" or average year were provided
by the Maryland 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 the USGS computer program
for calculating stream loadings. Nutrient loads indicated for
tributaries are those measured minus known point source loads,
if any.
Nutrient loadings for unsampled "minor tributaries and
immediate drainage" ("22" of USGS) were estimated by using the
mean annual concentrations in Brewington Branch at Station B(l)
and mean annual 22 flow.
The operator of the Delmar and Purdue Inc. (Salisbury)
wastewater treatment plants provided monthly effluent samples
and corresponding flow data.
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10
A. Waste Sources:
1. Known municipal -
Population Mean Flow Receiving
Served Treatment (m3/d x ICr) Water
2,500* Trickling 0.950** Wood Creek,
filter Leonard Pond Run
2. Known industrial -
Mean Flow Receiving
Name Product Treatment (nr/d x 10^) Water
Purdue Inc. Soybean Stabilization 3.312 Peggy Brook
(Salisbury)*** plant, pond
Feed mi 11,
Chicken
hatchery
*Provided by the State of Maryland.
**Estimated based upon 0.38 m3/capita/day.
***Corisists of an old plant and a new plant. New plant also serves a
population of 150 employees.
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11
B. Annual Total Phosphorus Loading - Average Year:
1. Inputs -
% of
Source kg P/yr total
a. Tributaries (nonpoint load) -
A(2) Wicomico River 5,205 59-6
B(l) Brewington Branch 355 4-1
C(l) Middle Neck Branch 200 2-3
b. Minor tributaries & immediate
drainage (nonpoint load) - 425 4-9
c. Known municipal STP's - Delmar 1,630 18-6
d. Septic tanks* - 5 <0.1
e. Known industrial -
Purdue Inc. (Salisbury) 915 10-5
f. Direct precipitation** - 5_ <0.1
Total 8>740 100.0
2. Outputs - A(l) Wicomico River 7,385
3. Net annual P accumulation - 1,355 kg.
*Estimate based upon 22 lakeside residences.
**Estimated (see NES Working Paper No. 175).
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12
C. Annual Total Nitrogen Loading - Average Year:
1. Inputs -
% of
Source kg N/yr total
a. Tributaries (nonpoint load) -
A(2) Hicomico River 113,055 78.1
B(l) Brewington Branch 4,415 3.0
C(l) Middle Neck Branch 13,965 9.6
b. Minor tributaries & immediate
drainage (nonpoint load) - 5,635 3.9
c. Known municipal STP's - Delmar 4,340 3.0
d. Septic tanks * - 10 <0.1
e. Known industrial -
Purdue Inc. (Salisbury) 3,105 2.1
f. Direct precipitation** - 455 0.3
Total 144,980 100.0
2. Outputs - A(l) Wicomico River 161,405
3. Net annual N export*** - 16,425 kg.
*Estimate based upon 22 lakeside residences.
**Estimated (see NES Working Paper No. 175).
***Calculated export probably due to unknown sources and/or sampling error.
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13
D. Mean Annual Nonpoint Nutrient Export by Subdrainage Area:
Tributary kg P/km2/yr kg N/km^/yr
A(2) Wicomico River 77 1,665
B(l) Brewington Branch 34 425
C(l) Middle Neck Branch 14 956
E. Yearly Loading Rates:
In the following table, the existing phosphorus loading
rates are compared to those proposed by Vollenweider (in press).
Essentially, his "dangerous" rate is the rate at which the
receiving waters would become eutrophic or remain eutrophic; his
"permissible" rate is that which would result in the receiving
water remaining oligotrophic or becoming oligotrophic if mor-
phometry permitted. A mesotrophic rate would be considered one
between "dangerous" and "permissible".
Total Yearly
Phosphorus Loading Rate
(grams/nr/year)
Estimated loading rate for Johnson Pond 20.81
Vollenweider's "dangerous" or eutrophic rate 2.24
Vollenweider's "permissible" or oligotrophic rate ~\ ."\2
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14
V. LITERATURE REVIEWED
U.S. Environmental Protection Agency. 1975. "National
Eutrophication Survey Methods 1974-1976." Working Paper
No. 175. NERC, Las Vegas, Nevada and PNERL, Corvallis,
Oregon.
Vollenweider, Richard A. (in press). "Input-Output Models."
Schweiz Z. Hydro!.
-------
15
VI. APPENDICES
APPENDIX A
TRIBUTARY FLOW DATA
-------
TRIBUTARY FLOW INFORMATION FOR MARYLAND
9/16/75
LAKE CODE 2409
JOHNSON POND
96.1
MAR
APR
MAY
96.1
67.9
10.4
14.6
3.2
2.29
1.67
0.13
0.30
0.19
2.63
1.87
0.20
0.32
0.24
3.17
2.10
0.24
0.35
0.49
2.49
1.78
0.16
0.31
0.23
1.78
1.42
0.07
0.27
0.03
1.53
1.16
0.03
0.24
0.10
1.22
0.96
0.01
0.20
0.04
1.70
1.33
0.05
0.25
0.06
1.19
0.93
-0.01
0.20
0.05
1.36
1.02
0.02
0.21
0.11
1.56
1.19
• .04
• .24
• .•9
1.7S
1.42
0.07
0.27
0.03
l.«9
1.4*
• ••*
«.2«
• .14
TOTAL DRAINAGE AREA OF LAKE(SO KM)
SUB-DRAINAGE
TRIBUTARY AREA(SO KM) JAN FEB
2409A1
2409A2
240981
2409C1
2409ZZ
TOTAL DRAINAGE AREA OF LAKE
SUM OF SUB-DRAINAGE AREAS
MEAN MONTHLY FLOWS AND DAILY FLOWS(CMS)
TRIBUTARY MONTH YEAR MEAN FLOW DAY FLOW DAY
2409A1
NORMALIZED FLOWS(CMS)
JUN JUL AUG
SEP
OCT
NOV
DEC
MEAN
2409A2
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
73
73
73
73
73
73
73
73
74
74
74
74
73
73
73
73
73
73
73
73
74
74
74
74
.93
.39
.19
.49
.61
.33
.19
2.32
2.92
2.18
2.07
2.63
.50
.05
.88
.78
.25
.02
.88
.67
.98
.61
.56
1.87
12
9
15
11
8
13
10
9
15
10
10
14
12
9
15
11
8
13
10
9
15
10
10
14
96.1
96.1
1.87
.22
.08
.10
.44
.33
1.39
2.41
1.93
1.87
1.64
2.75
1.44
0.91
0.79
0.79
1.10
.02
.05
.73
.50
.47
1.30
1.90
24
24
24
24
SUMMARY
TOTAL FtOW IN
TOTAL FLOW OUT
22.71
22.71
FLOW DAY
FLOW
2.18
2.27
1.61
1.64
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TRIBUTARY FLOW INFORMATION FOR MARYLAND
9/16/75
LAKE CODE 2409
JOHNSON POND
MEAN MONTHLY FLOWS AND DAILY FLOWS(CMS)
TRIBUTARY
2409B1
2409C1
2409ZZ
MONTH YEAR
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
73
73
73
73
73
73
73
73
74
74
74
74
73
73
73
73
73
73
73
73
74
74
74
74
73
73
73
73
73
73
73
73
74
74
74
74
MEAN FLOW DAY
0.08
0.02
0.01
0.16
0.04
0.02
0.01
0.14
0.22
0.12
0.10
0.20
0.28
0.21
0.19
0.31
0.24
0.21
0.19
0.31
0.34
0.28
0.28
0.31
0.06
0.10
0.11
0.24
0.08
0.08
0.11
0.20
0.37
0.16
0.12
0.25
12
9
15
11
8
13
10
9
15
10
10
14
12
9
15
11
8
13
10
9
15
10
10
14
12
9
15
11
8
13
10
9
15
10
10
14
FLOW DAY
FLOW DAY
FLOW
0.08
0.01
0.01
0.01
0.03
0.02
0.02
0.15
0.08
0.08
0.05
0.20
0.27
0.20
0.18
0.18
0.22
0.21
0.22
0.31
0.28
0.27
0.25
0.31
0.08
0.10
0.10
0.12
0.09
0.08
0.10
0.22
0.06
0.05
0.04
0.34
24
24
24
24
24
24
0.12
0.13
0.28
0.31
0.16
0.18
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APPENDIX B
PHYSICAL and CHEMICAL DATA
-------
STORET RETRIEVAL DATE 75/09/16
240901
38 22 38.0 075 36 05.0
JOHNSON PONO
24045 MARYLAND
DATE
FROM
TO
73/04/10
73/07/20
73/09/28
TIME DEPTH
or
DAY FEET
15 00 0000
15 00 0006
15 25 0000
15 25 0005
14 20 0000
14 20 0006
00010
WATER
TEMP
CENT
13.4
13.2
27.4
24.6
20.0
19.2
00300 00077
DO TRANSP a
SECCHI FIELD
MG/L INCHES MI
8.9
16.0
11.5
8.2
7.8
30
35
72
11EPALES
3
2111202
0010 FEET
DEPTH
94
TVY
MHO
85
85
110
94
74
72
00400
PH
SU
8.40
8.40
9.90
9.00
7.40
6.90
00410
T ALK
CAC03
MG/L
10
10
12
15
17
16
00610
NH3-N
TOTAL
MG/L
0.150
0.130
0.050
0.060
0.100
0.080
00625
TOT KJEL
N
MG/L
0.800
0.600
1.9*0
0.900
1.300
0.500
00630
N02LN03
N-TOTAL
MG/L
0.800
1.100
0.380
0.730
1.450
1.680
00671
PHOS-OIS
ORTHO
MG/L P
0.040
0.040
0.011
0.024
0.033
0.053
00665 32217
DATE TIME DEPTH PHOS-TOT CHLRPHYL
FROM OF A
TO DAY FEET MG/L P UG/L
73/04/10 15 00 0000 0.095 3.0
15 00 0006 0.093
73/07/20 15 25 0000 0.121 69.1
15 25 0005 0.110
73/09/28 14 20 0000 0.098 30.2
14 20 0006 0.098
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STORET RETRIEVAL DATE 75/09/16
240902
38 23 12.• 075 35 45.0
JOHNSON POND
24045 MARYLAND
DATE TIME DEPTH
FROM OF
TO DAY FEET
73/04/10 15 20 0000
00010
MATER
TEMP
CENT
13.5
00340 00077 00094
DO TRANSP CNOUCTVY
SECCHI FIELD
MG/L INCHES M1CROMHO
8.3
30
85
HEP ALES
3
2111202
0005 FEET
DEPTH
00400
PH
SU
8.50
00410
T ALK
CACO3
HG/L
00410
10K
TOTAL
M6/L
0.100
00625 0*630
TOT KJCL MNRN03
N N-TOTAt.
MG/L N6/L .
00*71
mo»*is
QVTHft
0.700
••TOO
0*465 32217
DATE TIME DEPTH PHOS-TOT CHLRPHYL
FROM OF A
TO DAY FEET MG/L P UG/L
73/04/10 15 20 0000
0.076
2.6
K VALUE KNOWN TO BE
LESS THAN INDICATED
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APPENDIX C
TRIBUTARY and WASTEWATER
TREATMENT PLANT DATA
-------
STORE! RETRIEVAL DATE 75/09/16
2409A1
38 22 18.0 075 36 12.0
WILCOMICO RIVER
24005 7.5 SALISBURY
O/JOHNSON POND
BRD6 BTWN JOHNSON PD AND N PRONG
11EPALES i 2111204
4 0000 FEET DEPTH
DATE
FROM
TO
73/05/12
73/06/09
73/07/15
73/08/11
73/09/08
73/10/13
73/11/10
73/12/09
74/01/15
74/02/10
74/02/24
74/03/10
74/03/24
74/04/14
74/05/18
TIME DEPTH
OF
DAY FEET
11 30
09 05
13 55
11 00
14 30
10 00
14 10
13 40
13 21
11 00
13 30
13 00
12 50
14 00
00630
N02&N03
N-TOTAL
MG/L
1.400
1.040
0.340
1.000
0.510
1.420
1.420
1.600
1.500
2.100
1.850
1.520
1.500
1.360
0.970
00625
TOT KJEL
N
MG/L
1.050
0.980
3.500
1.100
1.300
1.150
0.400
0.700
3.200
1.600
0.600
0.900
0.900
1.200
00610
NH3-N
TOTAL
MG/L
0.025
0.011
1.300
1.000
0.015
0.050
0.163
0.032
0.108
0.140
0.110
0.010
0.025
0.030
0.155
00671
PHOS-OIS
ORTHO
MG/L P
0.046
0.050
0.635
0.550
0.058
0.063
0.072
0.048
0.070
0.060
0.030
0.030
0.050
0.032
00665
PHOS-TOT
MG/L P
0.115
0.100
1.350
1.250
0.110
0.200
0.110
0.120
0.090
0.820
0.170
0.085
0.140
0.070
0.110
-------
STORET RETRIEVAL DATE 75/09/16
2409A2
38 24 32.0 075 35 30.0
WILCOMICO RIVER
24 7.5 DELMAR
I/JOHNSON POND
NAYLOR MILL RD BRDG BLOW NAYLORS POND
11EPALES 2111204
4 0000 FEET DEPTH
DATE
FROM
TO
73/05/12
73/06/09
73/07/15
73/08/11
73/09/08
73/10/13
73/11/10
73/12/09
74/01/15
74/02/10
74/02/24
74/03/10
74/03/24
74/04/14
74/05/18
00630 00625
TIME DEPTH N02&N03 TOT KJEL
OF N-TOTAL N
DAY FEET
10 35
08 40
13 25
10 30
14 05
10 15
14 40
11 10
14 00
12 00
12 45
14 10
12 10
13 20
MG/L
1.950
2.300
2.200
2.300
1.660
2.200
4.200
1.850
1.760
2.270
1.960
2.200
1.680
1.700
2.000
MG/L
0.500
0.500
0.350
0.390
0.710
0.630
2.300
0.700
0.500
0.700
0.600
1.200
0.600
0.600
0.500
00610 00671 00665
NH3-N PHOS-DIS PHOS-TOT
TOTAL ORTHO
MG/L
0.090
0.075
0.040
0.036
0.085
0.110
0.294
0.148
0.108
0.185
0.090
0.220
0.120
0.065
0.080
MG/L P
0.088
0.150
0.176
0.210
0.077
0.138
0.136
0.044
0.065
0.060
0.110
0.052
0.055
0.130
MG/L P
0.140
0.190
0.200
0.240
0.135
0.175
0.220
0.065
0.120
0.100
0.250
0.092
0.075
0.170
-------
STORE! RETRIEVAL DATE 75/09/16
2409B1
38 23 35.0 075 34 30.0
BREWINGTON BRANCH
24 7.5 DELMAR
T/JOHNSON POND
US HWY 13 BRDG N OF JCT WITH ZION RO
11EPALES 2111204
4 0000 FEET DEPTH
DATE
FROM
TO
73/05/12
73/06/09
73/07/15
73/08/11
73/09/08
73/10/13
73/11/10
73/12/09
74/01/15
74/02/10
74/02/24
74/03/10
74/03/24
74/04/14
74/05/18
TIME DEPTH
OF
DAY FEET
11 00
08 50
13 35
10 38
14 50
11 05
14 20
13 30
13 40
11 20
13 10
13 30
12 40
13 00
00630
N02&.N03
N-TOTAL
MG/L
0.500
0.300
0.440
0.085
0.410
0.350
0.140
0.264
0.490
0.860
0.516
0.470
0.216
0.232
1.520
00625
TOT KJEL
N
MG/L
1.150
1.350
4.800
1.680
1.320
0.730
0.650
0.700
0.400
0.800
0.500
0.700
0.800
1.000
4.200
00610
NH3-N
TOTAL
MG/L
0.340
0.470
0.940
0.440
0.230
0.147
0.147
0.076
0.036
0.115
0.030
0.095
0.035
0.052
0.165
00671
PHOS-DIS
ORTHO
MG/L P
0.058
0.075
0.176
0.092
0.044
0.040
0.023
0.060
0.020
0.025
0.015
0.025
0.025
0.017
0.105
00665
PHOS-TOT
MG/L P
0.150
0.185
0.310
0.300
0.130
0.100
0.075
0.200
0.035
0.105
0.050
0.055
0.075
0.035
0.600
-------
STORE! RETRIEVAL DATE 75/09/16
DATE
FROM
TO
73/05/12
73/06/09
73/07/15
73/08/11
73/09/08
73/10/13
73/11/10
73/12/09
74/01/15
74/02/10
74/02/24
74/03/10
74/03/24
74/04/14
74/05/18
00630 00625
TIME DEPTH N02&N03 TOT KJEL
OF N-TOTAL N
DAY FEET MG/L
11
08
13
10
14
10
14
11
14
11
13
13
13
13
10
55
40 (
46 (
10
35
30
.600
.060
.780
.700
.540
.610
.500
.340
20 1.800
00 2.400
40 1.700
20 1.760
45 1.600
00 1.600
00 0.172
MG/L
0.820
0.890
0.840
0.460
0.355
0.750
0.650
0.300
0.400
0.200
0.600
0.400
0.500
0.600
4.600
US HMY 1
11EPALES
4
00610 00671 00665
NH3-N PHOS-DIS PHOS-TOT
TOTAL ORTHO
MG/L
0
0
0
0
0
0
0
0
0
.230
.110
.079
.132
.050
.027
.095
.036
.100
0.025
0
0
0
0
1
.030
.030
.040
.060
.100
MG/L
0.
0.
P
160
130
0.085
0.
0.
0.
0.
0.
0.
105
066
054
063
128
088
0*055
0.
0.
0.
0.
0.
105
075
095
100
220
MG/L
0
0
0
0
0
0
0
0
0
•
•
•
•
•
•
•
•
•
P
240
190
130
148
110
085
110
175
115
0.080
0
0
0
0
0
•
•
•
•
•
150
105
145
100
530
2409C1
38 23 00.0 075 35 00.0
MIDDLE NECK BRANCH
24 7.5 DELMAR
T/JOHNSON POND
13 8RDG .5MI S OF JCT WTH ZION RD
2111204
0000 FEET DEPTH
-------
STORE! RETRIEVAL DATE 75/09/16
240930 PD240930 POOOOOO*
38 22 55.0 075 32 02.0
PERDUE INC. (SALISBURY)
24045 WICOMICO COUNTY
T/JOHNSONS POND
PEGGY BROOK
11EPALES 2141204
4 0000 FEET DEPTH
DATE
FROM
TO
73/06/01
73/08/02
73/09/02
73/10/04
73/11/02
74/C1/10
74/02/01
74/03/07
74/08/23
74/09/18
74/10/20
74/11/22
74/12/12
74/12/31
00630 00625
TIME DEPTH N02&N03 TOT KJEL
OF N-TOTAL N
DAY FEET
12
13
13
10
14
16
09
10
30
30
30
30
00
30
30
00
MG/L
0.
1.
1.
1.
0.
2.
0.
1.
0.
3.
4.
3.
0.
0.
880
400
900
680
780
240
830
520
040
000
000
680
720
560
MG/L
0.750
2.100
0.120
1.400
0.900
0.620
1.400
1.500
1.500
1.025
l.OOOK
3.200
4.650
6.000
00610 00671 00665
NH3-N PHOS-DIS PHOS-TOT
TOTAL ORTHO
MG/L
0.315
0.217
0.078
0.390
0.380
U.520
0.245
0.050K
0.068
0.050K
0.360
0.480
0.640
MG/L P
0.220
0.197
0.100
0.270
0.210
0.450
0.500
1.125
0.050
0.075
0.130
0.720
4.000
4.500
50051 50053
FLOW CONDUIT
RATE FLOW-MGD
MG/L P INST
0.350
0.480
0.212
0.510
0.570
0.910
0.800
1.150
1.700
2.700
0.800
4.550
5.100
0
0
0
0
0
0
0
0
0
0
MGD MONTHLY
.875
.875
.875
.875
.875
.875
.875
.875
.875
.875
0.875
0.875
0.875
0.875
0.875
0.875
0.875
0.875
0.875
0.875
K VALUE KNOWN TO BE
LESS THAN INDICATED
-------
STORE! RETRIEVAL DATE 75/09/16
340931 TF240931 P002500
38 25 22.0 075 34 15.0
OELMAR
24 MICOMICO COUNTY
T/JOHNSONS POND
HOOD CREEK/LEONARD POND RUN
11EPALES 2141204
4 0000 FEET DEPTH
DATE
FROM
TO
73/06/06
73/07/09
73/08/06
73/09/04
73/10/04
73/11/05
73/12/03
74/01/04
74/02/04
74/03/04
74/04/02
74/05/02
74/06/04
00630
TIME DEPTH N02&N03
OF N-TOTAL
DAY FEET
12
10
12
09
09
10
09
09
10
09
09
08
11
00
00
00
00
00
00
00
00
00
00
00
00
00
MG/L
0.
1.
1.
1.
1.
3.
2.
1.
2.
1.
1.
0.
940
380
480
050
050
100
900
840
000
120
600
880
00625
TOT KJEL
N
MG/L
15.000
12.000
4.570
9.000
22.000
19.500
3.700
4.200
6.400
7.500
10.000
17.000
00610 00671
NH3-N PHOS-DIS
TOTAL ORTHO
MG/L
9.900
6.200
6.900
11.800
19.000
1.520
2.600
3.150
2.700
5.000
7.800
MG/L P
4.140
4.500
3.700
6.900
7.100
0.750
1.120
1.600
1.750
2.500
4.100
00665
PHOS-TOT
50051 50053
FLOW CONDUIT
RATE FLOW-MGO
MG/L P INST
5.250
5.200
4.600
11.500
8.250
1.300
1.550
2.300
3.000
3.400
5.400
0
0
0
0
0
0
0
0
0
0
0
0
0
MGD MONTHLY
.350
.300
.350
.350
.300
.300
.350
.300
.350
.350
.350
.350
.350
0.350
0.300
0.350
0.350
0.325
0.350
0.325
0.300
0.350
0.350
0.350
0.350
0.350
-------
APPENDIX D
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 E
PARAMETRIC RANKINGS OF LAKES
SAMPLED BY NES IN 1973
STATE OF MARYLAND
-------
LAKES RANKED BY INDEX NOS.
RANK LAKE CODE LAKE NAME INDEX NO
1 2402 DEEP CREEK LAKE 550
2 2403 LIBERTY RESERVOIR 268
3 2408 LOCH RAVEN RESERVOIR 215
4 2409 JOHNSON POND 167
-------
LAKE DATA TO BE USED IN RANKINGS
LAKE
CODE LAKE NAME
2402 DEEP CREEK LAKE
2403 LIBERTY RESERVOIR
2408 LOCH RAVEN RESERVOIR
2409 JOHNSON POND
MEDIAN
TOTAL P
0.011
0.018
0.023
0.098
MEDIAN
INORC N
0.450
1.760
1.440
0.950
500-
MEAN SEC
382.167
401.833
429.555
458.250
MEAN
CHLORA
6.150
6.325
7.133
26.225
15-
MIN 00
14.SOO
14.900
14.800
7.200
MEDIAN
OISS ORTHO P
0.005
0.006
0.007
0.040
-------
PERCENT OF LAKES WITH HIGHER VACUES (NUMBER OF LAKES WITH HIGHER VALUES)
LAKE
CODE LAKE NAME
2402 DEEP CREEK LAKE
2*03 LIBERTY RESERVOIR
2*08 LOCH RAVEN RESERVOIR
2*09 JOHNSON POND
MEDIAN
TOTAL P
100 (
67 (
33 (
0 (
3)
2)
1)
0)
MEDIAN
INORG N
100 (
0 (
33 (
67 (
3)
0)
1)
2)
500-
MEAN SEC
100 (
67 (
33 <
0 <
3)
2)
1)
0)
MEAN
CHLORA
100 (
67 I
33 <
0 (
3)
2)
1)
0)
15-
MIN DO
50 (
0 (
50 <
100 (
1)
0)
1)
3)
MEDIAN
DISS OOTHO P
100 (
67 (
33 (
0 (
3)
2)
1)
0)
IMDCX
NO
5M
2*8
215
1*7
------- |