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-O32
-------
REPORT
ON
MOUNTAIN ISLAND LAKE
GASTDN AND rcCKLENBURG COUNTIES
NORTH CAROLINA
EPA REGION IV
WORKING PAPER No, 386
WITH THE COOPERATION OF THE
NORTH CAROLINA DEPARTMENT OF NATURAL AND ECONOMIC RESOURCES
AND THE
NORTH CAROLINA NATIONAL GUARD
JUNE, 1975
799
-------
CONTENTS
Page
Foreword i i
List of North Carolina Study Lakes iv
Lake and Drainage Area Map v
Sections
I. Conclusions 1
II. Lake and Drainage Basin Characteristics 4
III, Lake Water Quality Summary 5
IV. Nutrient Loadings 10
V. Literature Reviewed 14
VI. Appendices 15
-------
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 fresh water 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)], water
quality criteria/standards review [§303(c)], clean lakes [§314(a,b}],
and water quality monitoring [§106 and §305(b)] activities mandated
by the Federal Water Pollution Control Act Amendments of 1972.
-------
111
Beyond the single lake analysis, broader based correlations
between nutrient concentrations (and loading) and trophic condi-
tion are being made to advance the rationale and data base for
refinement of nutrient water quality criteria for the Nation's
fresh water 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 Eutrophlcation Survey (Office of
Research & Development, U.S. Environmental Protection Agency)
expresses sincere appreciation to the North Carolina Department
of Natural and Economic Resources for professional Involvement
and to the North Carolina National Guard for conducting the
tributary sampling phase of the Survey.
Lewis R. Martin, Director of the Division of Environmental
Management; Darwin L. Coburn, Chief of the Water Quality Section;
and Julian R. Taylor, Supervisor of the Monitoring Program Unit;
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 William M. Buck, formerly Adjutant General of
North Carolina, and Project Officer Colonel Arthur J. Bouchard,
who directed the volunteer efforts of the North Carolina National
Guardsmen, are also gratefully acknowledged for their assistance
to the Survey.
-------
iv
NATIONAL EUTROPHICATION SURVEY
STUDY LAKES
STATE OF NORTH CAROLINA
LAKE NAME
Badin
Blewett Falls
Chatuge
Fontana
Hickory
High Rock
Hiwassee
James
John H. Kerr (Nut Bush Creek)
Junaluska
Lookout Shoals
Mountain Island
Norman
Rhodhiss
Santeetlah
Tillery
Waccamaw
Waterville
Wylie
COUNTY
Montgomery, Stanly
Anson, Richmond
Clay, NC; Towns, GA
Graham, Swain
Alexander, Caldwell,
Catawba
Davidson, Rowan
Cherokee
Burke, McDowell
Granville, Vance, Warren,
NC; Halifax, Mecklenburg,
VA
Haywood
Alexander, Catawba, Iredell
Gaston, Mecklenburg
Catawba, Iredell, Lincoln,
Mecklenburg
Burke, Caldwell
Graham
Montgomery, Stanly
Columbus
Haywood
Gaston, Mecklenburg, NC;
York, SC
-------
Map Location
,-^Huntersville
MOUNTAIN
ISLAND
LAKE
MOUNTAIN ISLAND LAKE
Tributary Sampling Site
X Lake Sampling Site
CHARLOTTE
-------
MOUNTAIN ISLAND LAKE
STORET NO. 3711
I. CONCLUSIONS
A. Trophic Condition:
Survey data show that Mountain Island Lake 1s mesotrophlc.
However, because this water body has a mean hydraulic retention
time of only 12 days, it more closely resembles a slow-moving
river; and the term "moderately-enriched" may be a more appro-
priate description of the condition of the lake.
Mountain Island Lake ranked third in overall trophic quality
when the 16 North Carolina lakes sampled 1n 1973 were compared
using a combination of six parameters*. Three of the lakes had
less and one had the same median total phosphorus, one had less
and one had the same median dissolved phosphorus, four had less
median inorganic nitrogen, seven had less mean chlorophyll a_,
and eight had greater and one had the same mean Secchi disc
transparency.
Survey limnologists reported sparse emergent vegetation
along much of the shoreline but no concentrations of algae.
B. Rate-Limiting Nutrient:
The algal assay results indicate that Mountain Island Lake
was phosphorus limited at the time the assay sample was col-
lected (04/02/73). These results are substantiated by the
* See Appendix A.
-------
lake data during April and July; i.e., the mean N/P ratios
were 39/1 or greater at all sampling stations. During
September, the lake probably was nitrogen limited; the mean
N/P ratios were 13/1 or less at all stations, and nitrogen
limitation would be expected.
C. Nutrient Controllability:
1. Point sources—There were no known point sources
directly impacting Mountain Island Lake during the sampling
year. However, point sources upstream in the Catawba River
drainage contribute phosphorus indirectly (e.g., 9% of the
total phosphorus load to Lake Norman* was contributed by
point sources). Any reduction of the upstream point-source
phosphorus inputs would be expected to benefit Mountain Island
Lake since the lake is phosphorus limited much of the time.
The present Mountain Island Lake phosphorus loading rate of
4.31 g/m2/yr is 1.8 times the rate proposed by Vollenweider
(Vollenweider and Dillon, 1974) as a eutrophic rate (see page
13). However, the mean hydraulic retention time of the lake
is a short 12 days, and Vollenweider's model probably does not
apply.
2. Non-point sources--The phosphorus contribution of the
Catawba River accounted for nearly 87% of the total reaching
Working Paper No. 387.
-------
Mountain Island Lake. McDowell Creek contributed 11% of the
total, and the unsampled minor tributaries were estimated to
have contributed 1.435 of the total load.
The phosphorus export rate of McDowell Creek was a very
high 91 kg/km2 during the sampling year (see page 12). Since
no point sources are known to impact the creek, the high rate
may be due to urban drainage from Huntersvllle.
-------
II. LAKE AND DRAINAGE BASIN CHARACTERISTICS1"
A. Lake Morphometry :
1. Surface area: 13.09 kilometers2.
2. Mean depth: 5.4 meters.
3. Maximum depth: 17.8 meters.
4. Volume: 70.7 x 106 m3.
5. Mean hydraulic retention time: 12 days.
B. Tributary and Outlet:
(See Appendix C for flow data)
1. Tributaries -
Drainage Mean flow
Name area km2!* (m3/secl*
Catawba River 4,693.1 65.4
McDowell Creek 69.9 1.0
Minor tributaries &
immediate drainage - 46.5 0.8
Totals 4,809.5 67.2
2. Outlet -
Catawba River 4,822.6** 67.2**
C. Precipitation***:
1. Year of sampling: 124.6 centimeters.
2. Mean annual: 112.9 centimeters.
t Table of metric conversions—Appendix B.
tt Park, 1974.
* For limits of accuracy, see Working Paper No. 175, "...Survey Methods,
1973-1976".
** Includes area of lake; outflow adjusted to equal inflow.
*** See Working Paper No. 175.
-------
III. LAKE WATER QUALITY SUMMARY
Mountain Island Lake 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 three stations on the lake and from a number of depths at each
station (two samples were taken at station 1 1n July; see map, page v).
During each visit, a single depth-integrated (4.6 m to surface) sample
was composited from the three stations for phytoplankton identification
and enumeration; and during the first visit, a single 18.9-liter depth-
integrated sample was composited for algal assays. Also each time, a
depth-integrated sample was collected from each of the stations for
chlorophyll a. analysis. The maximum depths sampled were 16.8 meters
at station 1, 9.1 meters at station 2, and 4.9 meters at station 3.
The lake sampling results are presented in full 1n Appendix D and
are summarized in the following table.
-------
A. SUMMARY OF PHYSICAL AND CHEMICAL CHARACTERISTICS row MOUNTAIN ISLAND LAKE
STOrtET CODE 3711
PARAMtTti*
DISS OXY (WG/LJ
CNDCTVY HCkOMO)
PH fSTANU UNITS!
TOT ALK <*G/L)
TOT ft (MG/L)
UHTHO P
NU2»N03 (MG/L)
AMMONIA (MG/L)
KJEL N (Mb/LI
INWIi N (MG/L,)
TOTAL N (Mli/L)
CHL-O^YL A
SE.CCH1
1ST SAMPLING < 4/
10.7
*.*
55.
6.d
10.
U.G20
0.004
0.140
0.060
0.20U
'J.?JJ
J.35U
i.*
;j.4
3
P.ANGE
- 14.6
- 10.2
70.
7.3
13.
- 0.068
- U.011
- u.320
- u.100
- 0.^00
- J.400
- 0.690
- ft.0
0. >
SITES
MEAN
13.1
9.8
61.
7.1
11.
O.U4J
0.007
o.23r
U.07-*
0.^
0.332
O.blO
b.l
O.b
2/73)
MEUlAN
13. e
9.8
60.
7.0
11.
0.032
0.006
0.285
0.070
0.250
0.370
O.aOb
5.5
O.b
2NU SAMPLING < Ti
24.6
4.3
40.
6.4
13.
0.012
0.002
0.140
0.070
0.200
0.210
0.360
4.1
0.9
3
KANtiE
- 29.3
7.J
60,
7.4
20.
- 0.027
- 0.006
- 0,190
- 0.170
- 0.600
- 0.360
- 0.750
b. 7
1.5
SITES
MEAN
26.6
5.9
51.
6.6
17.
0.017
0.003
O.lc-b
0.112
0.341
0.2i>0
O.S09
4.7
U2
' 7/73)
MEDIAN
26.4
5.8
54.
6.6
17.
0.016
0.003
0.170
0.100
0.400
0.280
0.540
4.b
1.1
3KLJ
hiANGt
25.6 -
2.2 -
S9. -
6.3 -
12. -
0.00V - 0
0.004 - 0
0.020 - 0
0.020 - u
0.200 - 0
0.050 - 0
0.230 - 0
S.-J -
0.9 -
SAMPLING <
3
26.0
7.4
65.
6.9
18.
.020
.013
.060
.160
.600
.220
.640
8.3
1.4
SITES
MEAN
Zb.d
5.9
62.
6.6
IS.
0.013
0.008
0.035
0.047
0.364
O.OS3
0.399
1,'d
1.1
9/19/73)
MEDIAN
26.8
6.8
62.
6.6
IS.
0.013
0.007
O.OJO
0.030
0.300
0.060
0.330
7.3
0.9
-------
B. Biological characteristics:
1. Phytoplankton -
Sampling
Date
04/02/73
07/10/73
(station 01)
07/12/73
(stations 01 & 02)
09/19/73
Dominant
Genera
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
Meloslra
Flagellates
Asterionella
Dactyl ococcopsis
Oscillatoria
Other genera
Total
Meloslra
Flagellates
Pennate diatoms
Peridinium
Cosmarlum
Other genera
Total
Meloslra
Flagellates
Peridinium
Synedra
Tetraedon
Other genera
Total
Lyngbya
Meloslra
Raphidiopsis
Chi orel la
Cryptomonas
Other genera
Algal units
per ml
1,178
626
61
25
12
25_
1,927
2,460
335
112
56
56
37
73
669
525
358
267
235
201
785
Total
2,371
-------
8
2. Chlorophyll a. -
Sampling
Date
04/02/73
07/07, 10, 12/73
09/19/73
Station
Number
01
02
03
01
02
03
01
02
03
Chlorophyll a
(ug/1)
6.6
5.5
3.2
4.1-5.7
4.2
5.0
5.9
8.3
7.3
C. Limiting Nutrient Study:
1. Autoclaved, filtered, and nutrient spiked -
Ortho P Inorganic N Maximum yield
Spike (mg/1) Cone, (mg/1) Cone, (rng/1) (mg/l-dry wt.)
Control
0.050
0.050 + 1.0 N
1.0 N
2. Discussion -
cornutum, indicates that the potential primary productivity
of Mountain Island Lake was moderate at the time the sample
was collected. The addition of orthophosphorus alone
produced a 78-fold increase in yield over that of the control
which indicates phosphorus limitation. Note that addition of
0.020
0.070
0.070
0.020
eld of the
0.
0.
1.
1.
assay alga
312
312
312
312
, Selenastrum
0.2
15.6
16.9
0.3
capri-
-------
nitrogen alone resulted 1n a yield not significantly
greater than the control yield.
The lake data Indicate phosphorus limitation 1n
April and July; I.e., the mean Inorganic nitrogen to
orthophosphorus ratios were 39 to 1 or greater at all
stations. The September data Indicate probable nitrogen
limitation; the mean Inorganic nitrogen to orthophosphorus
ratios were 13 to 1 or less at all stations, and nitrogen
limitation would be expected.
-------
10
IV. NUTRIENT LOADINGS
{See Appendix E for data)
For the determination of nutrient loadings, the North Carolina
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 January and February when two samples were col-
lected. Sampling was begun in March, 1973, and was completed in
March, 1974.
Through an interagency agreement, stream flow estimates for the
year of sampling and a "normalized" or average year were provided by
the North Carolina District Office of the U.S. Geological Survey for
the tributary sites nearest the lake.
In this report, nutrient loads for sampled tributaries were deter-
mined by using a modification of a U.S. Geological Survey computer
program for calculating stream loadings*. Nutrient loads for unsampled
"minor tributaries and immediate drainage" ("ZZ" of U.S.G.S.) were esti-
mated using means of the nutrient loads, in kg/km2/year, at stations B-l
and D-l of nearby Lake Norman and multiplying the means by the ZZ area
in km2.
* See Working Paper No. 175.
-------
n
A. Waste Sources:
1. Known municipal - None
2. Known Industrial - None
B. Annual Total Phosphorus Loading - Average Year:
1. Inputs -
kg P/ % of
Source ^r total
a. Tributaries (non-point load) -
Catawba River 49,010 86.9
McDowell Creek 6,390 11.3
b. Minor tributaries & immediate
drainage (non-point load) - 765 1.4
c. Known municipal STP's - None
d. Septic tanks - Unknown
e. Known industrial - None
f. Direct precipitation* - 230 0.4
Total 56,395 100.0
2. Outputs -
Lake outlet - Catawba River 42,815
3. Net annual P accumulation - 13,580 kg.
* See Working Paper No. 175.
-------
12
C. Annual Total Nitrogen Loading - Average Year:
1. Inputs -
kg N/ % of
Source y_r total
a. Tributaries (non-point load) -
Catawba River 1,599,080 94.9
McDowell Creek 48,085 2.9
b. Minor tributaries & immediate
drainage (non-point load) - 23,880 1.4
c. Known municipal STP's - None
d. Septic tanks - Unknown
e. Known industrial - None
f. Direct precipitation* - 14.130 0.8
Total 1,685,175 100.0
2. Outputs -
Lake outlet - Catawba River 1,810,470
3. Net annual N loss - 125,295 kg.
D. Mean Annual Non-point Nutrient Export by Subdrainage Area:
Tributary kg P/km2/yr kg N/km2/yr
Catawba River 10 341
McDowell Creek 91 688
See Working Paper No. 175.
-------
E. Yearly Loading Rates:
In the following table, the existing phosphorus loading
rates are compared to those proposed by Vollenweider (Vollen-
weider and Dillon, 1974). Essentially, his "dangerous" rate
is the rate at which the receiving water would become eutrophic
or remain eutrophic; his "permissible" rate is that which would
result in the receiving water remaining oligotrophic or becoming
oligotrophic if morphometry permitted. A mesotrophic rate 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 4.31 1.04 128.7 loss*
Vollenweider loading rates for phosphorus
(g/m2/yr) based on mean depth and mean
hydraulic retention time of Mountain Island Lake:
"Dangerous" (eutrophic rate) 2.40
"Permissible" (oligotrophic rate) 1.20
* There was an apparent loss of nitrogen during the sampling year. This may
have been due to nitrogen fixation in the lake, solubilization of previously
sedimented nitrogen, recharge with nitrogen-rich ground water, unknown and
unsampled point sources discharging directly to the lake, or insufficient
outlet sampling in relation to the very short hydraulic retention time of
the lake. Whatever the cause, a similar nitrogen loss has occurred at
Shagawa Lake, Minnesota, which has been Intensively studied by EPA's
National Eutrophication and Lake Restoration Branch (Malueg et al., 1975).
-------
14
V. LITERATURE REVIEWED
Park, David, 1974. Personal communication (lake morphometry). NC
Dept. of Nat. & Econ. Resources, Raleigh.
Malueg, Kenneth W., D. Phillips Larsen, Donald W. Schults, and
Howard T. Mercier; 1975. A six-year water, phosphorus, and
nitrogen budget for Shagawa Lake, Minnesota. Jour. Environ.
Qual., vol. 4, no. 2, pp. 236-242.
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.
Weiss, Charles M., 1972. A proposal to the Water Resources
Research Institute of the University of North Carolina. The
trophic state of North Carolina lakes, covering the period
from July 1, 1972, to June 30, 1973. U. of North Carolina,
Chapel Hill.
-------
15
VI. APPENDICES
APPENDIX A
LAKE RANKINGS
-------
LAKES RANKED BY INDEX NOS.
LAKE CODE LAKE NAME
1 3719
2 3716
3 3711
4 3707
5 3704
6 3713
7 3708
3 3710
9 3715
10 3705
11 3717
12 3709
13 3702
14 3713
15 3701
16 3706
LAKE
SANTEELAH LAKE
MOUNTAIN ISLAND LAKE
HIWASSEE LAKE
FONTANA LAKE
LAKE NORMAN
LAKE JAMES
LOOKOUT SHOALS
RHODHISS LAKE
LAKE HICKORY
LAKE TILLERY
LAKE JU.NALUSKA
BLUETT FALLS LAKE
WATERVILLE RESERVOIR
BADIN LAKE
HIGH ROCK LAKE
INDEX .NO
534
446
419
414
392
346
334
327
296
283
246
220
200
140
124
76
-------
LAKE DATA TO BE USED IN RANKINGS
LAKE
CODE LAKE NAME
3701 BADIN LAKE
3702 BLEWETT FALLS LAKE
3704 FONTANA LAKE
3705 LAKE HICKORY
3706 HIGH ROCK LAKE
3707 HIWASSEE LAKE
3708 LAKE JAMES
3709 LAKE JUNALUSKA
3710 LOOKOUT SHOALS
3711 MOUNTAIN ISLAND LAKE
3713 LAKE NORMAN
3715 RHOOHISS LAKE
3716 SANTEELAH LAKE
3717 LAKE TILLERY
3718 WATERVILLE RESERVOIR
3719 LAKE WACCAMAW
MEDIAN
TOTAL P
0.042
0.090
0.011
0.047
0.090
0.015
0.020
0.031
0.026
0.018
0.019
0.061
0.011
0.040
0.103
0*018
MEDIAN
INORG N
0.680
0.655
0.550
0.320
0.580
0.240
0.160
0.560
0.370
0.270
0.330
0.305
0.160
0.470
0.860
0.120
500-
MEAN SEC
466.750
476.889
392.650
461.000
477.454
420.555
428.866
462.000
459.167
462.000
446.667
462.111
366.400
468.600
468.333
455.667
MEAN
CHLORA
7.190
4.167
3.438
7.275
14.283
5.678
7.660
7.233
4.200
5.580
5.807
3.578
5.360
6.827
3.817
3.583
15-
MIN DO
14.900
10.800
14.900
13.400
14.800
14.200
14.800
14.200
13.800
12.600
14.800
13.600
14.800
13.600
14.400
9.800
MEDI/
DISS ORTh
0.012
0.034
0.007
0.008
0.017
0.007
0.006
0.009
0.008
0.005
0.005
0.019
0.006
0.008
0.041
0.004
-------
PERCENT OF LAKES WITH HIGHER VALUES (NUMBER OF LAKES WITH HIGHER VALUES)
LAKE
CODE LAKE NAME
370 I BAOIN LAKE
3702 BLEWETT FALLS LAKE
3704 FONTANA LAKE
3705 LAKE HICKORY
3706 HIGH ROCK LAKE
3707 HIWASSEE LAKE
3708 LAKE JAMES
3709 LAKE JUWALUSKA
3710 LOOKOUT SHOALS
3711 MOUNTAIN ISLAND LAKE
3713 LAKE NORMAN
3715 RHCDHISS LAKE
3716 SANTEELAH LAKE
3717 LAKE TILLERY
3718 WATERVILLE RESERVOIR
3719 LAKE riACCAMA*
MEDIAN
TOTAL P
33 t
7 (
100 (
27 (
13 (
87 (
60 <
47 (
53 <
73 (
67 (
20 (
93 (
40 (
0 (
80 (
5)
1)
15)
4)
2)
13)
9)
7)
a>
in
10)
3)
14)
6)
0)
12)
MEDIAN
INOKG N
7
13
33
60
20
80
87
27
47
73
53
67
93
40
0
100
I 1)
< 2)
t 5)
( 9)
( 3)
< 12)
( 13)
( 4)
( 7)
{ 11)
( 8)
( 10)
( 14)
< 6)
( 0)
( 15)
500-
MEAM SEC
27 (
7 (
93 C
53 (
0 (
87 (
80 (
43 (
60 (
43 t
73 <
33 (
100 (
13 (
20 t
67 (
4)
1)
14)
8)
0)
13)
12)
6)
9)
6)
11>
5>
15)
2)
3)
10)
MEAN
CHLORA
27
73
100
13
0
47
7
20
67
53
40
93
60
33
80
87
( 4)
< 11)
< 15)
( 2)
( 0)
( 7)
( 1)
( 3)
( 10)
( 8)
< 6)
( 14)
( 9)
( 5)
< 12)
< 13)
15-
MIN DO
3
93
3
80
23
50
23
50
60
87
23
70
23
70
40
100
( 0)
( 14)
( 0)
( 12)
( 2)
( 7)
< 2)
{ 7)
( 9>
I 13)
( 2)
( 10)
{ 2)
( 10)
( 6)
( 15)
MEDIAN
DISS OKTHO P
27 (
7 (
63 (
50 (
20 (
63 t
77 (
33 (
40 (
90 (
90 (
13 (
77 (
50 (
0 (
100 (
4)
1)
9)
7>
3>
9)
11)
5)
6)
13)
13)
2>
11)
7)
0)
IS)
INDEX
NO
124
200
392
283
76
414
334
220
327
419
346
296
446
246
140
534
-------
APPENDIX B
CONVERSIONS 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
-------
LAKE CODE 3711
TRIBUTARY FLOW INFORMATION FOR NORTH CAROLINA
MOUNTAIN ISLAND RESERVOIR
10/21/75
MEAN MONTHLY FLOWS AND DAILY FLOWS(CFS)
TRIBUTARY
3711B1
3711ZZ
MONTH YEAR
3
4
5
6
7
8
9
10
11
12
1
2
3
3
4
5
6
7
8
9
10
11
12
1
2
3
73
73
73
73
73
73
73
73
73
73
74
74
74
73
73
73
73
73
73
73
73
73
73
74
74
74
MEAN FLOy DAY
100.00
75.00
6S.OO
35.00
20.00
18.00
19.00
19.00
18.00
36.00
75.00
55.00
48.00
90.00
65.00
55.00
30.00
17.00
15.00
16.00
16.00
15.00
31.00
68*00
45.00
40.00
24
29
3
1
4
9
14
4
a
6
3
3
FLO* DAY
FLOW DAY
FLOW
54.00
44.00
34.00
23.00
41.00
15.00
16.00
25.00
28.00
50.00 21
115.00 15
34.00
470.00
38.00
-------
APPENDIX D
PHYSICAL and CHEMICAL DATA
-------
STORET RETRIEVAL DATE 75/10/2U
371101
35 20 12.0 080 59 10.0
MOUNTAIN ISLAND LAKE
37071 NOHTH CAROLINA
DATE
FROM
TO
73/04/02
73/07/07
73/07/10
73/09/19
00010
TIME DEPTH WATER
UF TEMP
DAY FEET
08
OB
08
08
08
16
16
16
16
16
16
16
16
16
16
15
15
15
15
15
15
15
15
15
15
30
30
30
30
30
30
30
30
30
30
S5
S5
55
55
55
0000
0004
0015
0035
0055
0000
0010
0030
0051
0000
001*6
0015
002H
0043
0053
0000
0015
0030
0040
0053
CENT
14
14
13
13
12
29
?8
26
25
29
27
26
26
25
25
2B
?7
26
26
26
.t>
.5
.5
.0
.4
.0
.5
.4
.3
.3
.3
.9
.1
.7
.3
.0
.rt
.a
.4
.1
11EPALES
00300
DO
MG/L
10.2
9.8
10.1
9.8
7.3
5.7
4.3
6.3
6.1
5,8
5.4
5.3
s.2
3.6
2.2
00077 00094
TRAMSP CNOUCTVY
SECCHI FIELO
INCHES M1CROMHO
27 60
55
60
60
60
60 60
55
55
59
48 60
57
54
54
54
55
b7 62
63
63
62
65
3
00400
HH
su
7.20
7.30
7.00
7.00
7.00
7.40
6.80
6.60
6.60
6.70
6.60
6.50
6.50
6.60
6.40
6.70
6.60
6.60
6.30
6.40
00410
T ALK
CAC03
MG/L
12
13
10K
10K
10K
13
13
13
15
16
17
20
IB
20
19
15
13
14
16
16
2111202
0059
00610
NH3-N
TOTAL
MG/L
0.070
0.060
0.060
0.060
0.060
0.080
0.070
0.090
0.140
0.130
0.130
0.120
0.150
U.140
0.170
0.040
0.030
0.040
0.070
0.160
FEET DEPTH
00625
TOT KJEL
N
MG/L
0.200
0.200K
0.300
0.200
0.300
0.600
0.400
0.400
0.500
0.300
0.200K
0.400
0.400
0.500
0.500
0.500
0.200
0.200K
0.200
0.400
00630
N02&N03
N-TOTAL
MG/L
0.280
0.260
0.140
0.1SO
0.150
0.150
0.140
0.150
0.160
0.170
O.lbO
0.180
0.170
0.170
0.190
0.040
0.030
0.040
0.040
0.060
00671
PHOS-DIS
OUT HO
MG/L P
0.006
0.006
0.005
O.OOS
0.004
0.006
0.003
0.003
0.004
0.005
0.003
0.005
0.003
0.002
0.003
0.012
0.007
0.007
0.004
0.011
X VALUE KNOWN TO BE
LESS THAN INDICATED
-------
bTOKEl
DATE
F«GM
TO
73/04/02
73/07/U7
73/07/lu
73/0^/19
JU665 3?? 17
TIME DtPlH PHOb-TOT CMLKPHYL
OF A
DAY FEET
08
08
08
Ort
OS
16
16
16
16
lf>
lo
16
16
16
16
15
15
15
15
15
15
15
16
15
15
JO
30
30
30
30
30
30
30
30
30
^5
SS
ss
^i5
SS
0000
OOO't
U015
U03t3
UU5S
OOCU
OUlO
0030
0051
0000
OuOb
OOlb
002H
0040
0053
0000
0015
0030
00*»0
J053
MG/L P
0.031
O.u2^
0.032
0.026
0.052
C.0?3
U.01-3
0.017
f .018
w.OPl
i.012
0.012
0.020
O.OlD
O.OlH
O.OlH
c . o o *
J . 0 j ^
0.013
0.01^
UG/L
6.6
4.1
S.7
5.9
371101
35 Id 12.0 060 5^ 10.0
MOUNTAIN ISLAND LAKE
37C71 NOKTh CAKQLINA
HEPALtS
3
2111202
0059 FtET
DEPTH
-------
STOHET rtETklEVAL DATE
371102
35 20 57.0 060 57 J3.0
MOUNTAIN ISLAND LAKE
3711V iMUrtTH CAKOLINA
D4TE
FROM
TO
TIME DEPTH
OH
DAY FEET
73/04/02 08 50 0000
US 50 0004
08 50 0015
08 50 0030
73/07/12 12 50
12 50
12 50
12 50
73/09/1S* 15
15
0000
0006
0015
0029
0000
0012
IS 30
DJClU
WAFER
TtMP
CENT
14.2
14.2
14!l
27.4
26.9
26. U
25.6
27.5
26.H
lltPALES
00300
00
MG/L
9.6
9.4
9.6
7.2
5.9
5.3
7.4
7.2
6,ri
00077
THANSP
SECCHI
INCHES
14
40
37
00094
CNOUCTYY
FIELD
MICHOMHO
70
61
60
60
43
40
42
40
60
63
64
3
00400
PH
bU
7.00
6.80
6.90
7.00
6.70
6.80
6.50
6.50
6.90
6.60
6.50
00410
T ALK
CACU3
HG/L
11
12
12
11
19
18
16
16
13
13
12
2111202
0034
00610
NH3-N
TOTAL
MG/L
0.100
0.090
0.100
0.090
0.110
0.100
0.100
0.090
0.030
0.030
0.030
FEET DEPTH
00625
TOT KJEL
N
MG/L
0.300
0.400
0.300
0.300
0.400
0.200
0.200K
0.200
0.600
0.300
0.300
00630
N02&N03
N-TOTAL
MG/L
0.28U
0.290
0.300
0.290
0.1SO
0.160
0.160
0.160
0.030
O.OJO
0.020
00671
PHOS-OIS
OHTHO
HG/L P
0.010
0.011
0.010
0.009
0.003
0.003
0.002
0.003
0.013
0.007
0.005
JATt
FROM
TO
73/04/0<>
73/07/12
73/09/ 19
J0665 32217
TIME DEPTH PHUS-TOT CHLRPHYL
OF A
UAY FEET
OH
oa
oa
08
1 ?
12
12
1?
Ib
15
Ib
50
^0
so
50
50
50
50
SO
30
JO
10
0000
0004
0015
003U
0000
U006
OOlb
U029
0000
0012
002B
Mb/L P
•J
0
u
0
f
0
J
ti
to
0
(1
.066
.06d
• Ot>2
• Cb1)
.027
.0 IH
.015
.01^
.02'J
.QiH
.01 1
UG/L
5.5
4.2
fl.3
K VALUE KNOWN TO HE
LESS THAN INDICATED
-------
STOKET kETRIEVAL OAFE 7S/13/20
371103
35 21 47.0 080 56 12.0
MOUNTAIN ISLAND LArtE
37119 NORTH CAROLINA
DATE TIME DEPTH
FrtOM OF
TO DAY FEET
73/04/0? 09 30 0000
09 30 0004
09 30 0015
73/07/12 13 20 0000
13 20 0006
13 20 0016
73/09/19 14 40 0000
14 40 0008
14 40 0015
00010
WATER
TEMP
CENT
10.6
11. 0
10.7
26.4
25. fe
24.6
26.7
26.0
25.6
00300 00077 00094
DO TRANSH CNDUCTVY
SECCHI FltLU
MG/L INCHES MlCKOMriO
9.6
9.8
6.4
5.7
7.0
7.0
6.8
24
37
36
60
60
60
45
43
44
62
59
60
11EPALES
3
00400
PH
bU
7.10
7.10
7.30
6.50
6.60
6.50
6.70
6.60
6.60
00410
T ALK
CAC03
MG/L
12
11
11
17
19
20
16
16
16
2111202
0020
00610
NH3-N
TOTAL
MG/L
0.070
0.070
0.060
0.090
0.090
0.100
0.040
0.030
0.020K
FEET DEPTH
00625
TOT KJEL
N
MG/L
0.200K
0.200K
0.200K
0.200
0.200K
0.200K
0.600
0.400
0.300
00630
N02&N03
N-TOTAL
MG/L
0.320
0.300
0.310
0.170
0.190
0.190
0.040
0.030
0.030
00671
PHOS-DIS
ORTHO
MG/L P
0.008
0.006
0.005
0.003
0.003
0.003
0.007
0.007
9.005
DATE TIME DEPTH
FROM OF
TO DAY FEET
73/04/02 09 30 0000
09 30 0004
09 30 0015
73/07/12 13 20 0000
13 20 OU06
13 20 OOlb
73/09/19 14 40 0000
14 40 0008
14 40 0015
0665
iS-TOT
i/L P
0.032
0.029
0.031
0.014
O.Olfa
0.016
0.013
0.013
C.014
32217
CHLRPHYL
A
UG/L
3.2
S.O
7.3
K VALUE KNOWN TO BE
LESS THAN INDICATED
-------
APPENDIX E
TRIBUTARY DATA
-------
HiETklEVAL LMTE 7b/10/2U
37HA1 Lb3711Al
35 20 00.0 080 5>J 00.0
CATAriBA hUVtk
37u3b 7.b PAw
U/MT ISLAND
f-rfOM 0AM 0.6 Ml t
HEHALtS
4
OF MOUNTAIN ISLAND
2111204
0000 FtLT DEPTH
OATd
FROM
TO
73/03/24
73/04/29
73/06/03
73/07/01
73/Od/04
73/09/09
73/10/14
73/11/04
7 3/12/Ort
74/ul/Ob
74/01/21
74/02/03
7-+/J2/15
74/03/03
OC630 00625
1 IMF DEPTH N02MMOJ TOT KJfL
OF .M-TOTAL N
iJAi
10
07
09
08
10
09
10
10
10
09
14
11
13
09
r FEET
05
40
00
30
05
^0
35
05
10
so
00
30
40
20
M13/L
G
J
u
0
0
J
0
0
0
u
0
0
0
0
.2bO
.240
.180
.132
tQoH
.030
.Ob6
.Odb
. 1U4
. 2b?
.264
.2b4
.280
.2b2
00610 00671 00665
NH3-N HHOS-DIS PHOS-TOT
TOTAL UKTHO
MG/L Mb/L
0.
0.
0.
c.
3.
0.
0.
0.
0.
0.
0.
1.
0.
0.
340
360
290
b60
200
220
600
sbO
200
100
500
300
200
500
0.
0.
0.
J.
0.
•J.
0.
0.
0.
0.
0.
0.
0.
u.
040
016
054
063
154
019
096
088
044
020
032
07j
020
025
MG/L
0.
0.
o.
0.
0.
0.
0.
0.
0.
0.
0.
u.
0.
0.
H
OObK
006
012
005K
005K
005K
006
010
OOSK
008
005K
065
OObK
OOSK
MG/L P
0.020
0.022
0.015
0.010
0.020
0.015
0.010
O.Olu
0.060
O.CJO
O.Olb
0.025
O.Olb
K VALUE KNOWN TO BE
LESS THAN INDICATED
-------
STORE.! RETRIEVAL DATE 7'3/10/2U
3711A2 LS3H1A2
35 23 00.0 080 59 JO.O
CATAWriA rtlVc.r«
37 7.5 HICKS CrfOSSI
I/MT ISLAND RtSVK
LivlD UIRT tfu 1.6 MI b OF LINCOLN CO LINE!
11EHALES 211120H
4 0000 FE£T DEPTH
DATE
FROM
TO
73/03/24
73/0^/24
73/06/03
73/07/01
73/08/04
73/09/09
73/10/1-4
73/11/04
73/12/08
74/01/06
74/01/21
74/02/03
74/02/15
74/OJ/03
00630 00625
TIME DEPTH N02&N03 TOT KJEL
OF H-TOTAL N
DAY FEET
10
08
fry
08
10
10
10
10
10
10
14
oy
14
10
40
05
30
35
35
10
15
?5
35
05
45
40
05
15
MG/L
0
a
0
0
0
0
u
0
u
0
0
0
0
0
.260
.250
.170
.13d
.OU6
.030
.06u
.063
.112
.252
.21o
.240
.252
.252
MG/L
0.
0.
0.
0.
1.
0.
0.
0.
0.
0.
0.
1.
1.
0.
400
340
160
440
600
220
2SO
550
300
600
300
600
(100
500
00610 00671 00665
NM3-N PHOS-DIS PHOS-TOT
TOTAL URTrlO
MG/L
0.
0.
0.
0.
c.
0*
0.
c.
0.
u.
0.
0.
u.
0.
115
066
018
028
115
016
038
068
06B
032
032
105
OS5
045
MG/L
0*
Qo
0.
0.
0.
0.
0.
p
005K
006
005K
005K
005K
007
005K
0.007
0.
0*
0.
0.
0.
0.
005K
005K
U12
020
005K
005K
MG/L P
0.035
0,020
0.010
U.G10
0.015
0.010
0.005K
0.015
0.010
O.G15
0.055
0.070
0.045
0.015
K VALUE KNOWN TO BE
LESS THAN INDICATED
-------
STORE! rt
DA!£ 75/10/20
DATE
FHOM
TU
73/03/24
73/06/03
73/07/01
73/08/04
73/09/09
73/10/1"
73/12/Ort
74/01/21
74/02/03
TIME DEPTH IM026.IM03
OF
DAr FEET
11 15
08 30
10 00
10 05
10 45
11 30
10 55
11 05
10 30
15 30
09 30
30
3Y11H1 LS371181
35 22 JO.Q OHO 56 jO.O
37 Y.b HICKS
T/MT IbLANu «£SVK
bKOG Oisl UNMMEJ HU
HEPALtS
74/03/03 11
J
'6,
0
10
0
t,1
0
0
0
0
0
0
o
0
0
d
c
c
630
IM03
TAL
/L
.37d
.399
.630
.640
.420
,72b
.670
.bk>0
.616
.504
.3tS4
.264
.440
.440
00625
TOT KJEL
N
MG/L
0.4?0
0.500
0.360
0.270
3.100
1.800
0.900
O.HOO
0.800
0.500
1.150
0.600
1.100
2.15U
00610
Nh3-i\l
TOTAL
MG/L
0.070
O.llU
0.056
Ct.032
0.160
0.420
0.069
0.040
0.09H
u.032
••1.232
0.045
0.105
0.040
00671
PHOS-DIS
OtfTHO
MG/L P
0.034
0.058
0.092
0.132
0*044
0.176
0.168
0.200
0.132
0.060
0.064
0.045
O.OB5
00665
PHOS-TOT
MG/L P
0.095
0.105
0.175
0.1BO
0.380
0.260
0.270
0.270
o.ias
O.l4b
0.313
0.125
0.148
1.2 d btftTTY FOrtD
2111204
0000 FttT DEPTH
------- |