20030179 Ver 6_Monitoring Report_20080926

DP Duke
Energy®
Carolinas
September 22, 2008
Mr. John Dorney
NC Division of Water Quality
1617 Mail Service Center
Raleigh, NC 27699-1617
HYDRO STRATEGY & LICENSING
Duke Energy CaroNnas, LLC
EC12YI526 South Church Street
Charlotte, NC 28202-1802
Mailing Address:
EC12Y/P.0. Box 1006
Charlotte, NC 28201-1006
Subject: Dillsboro Hydroelectric Project Second Quarter Water Quality and Sediment
Monitoring Report
Mr. Dorney:
Enclosed are the pre-dam removal water quality and sediment monitoring data collected at the
Dillsboro Project during the second quarter of 2008. These data are provided per the 401 Water
Quality Certification with Additional Comments dated November 21, 2007. If you have
questions regarding these data, please do not hesitate to give me a call at 704/382-0805.
Sincerely,
6 J4?-g
D. Hugh Barwick
Senior Environmental Resource Manager
Enclosure: Report
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DILLSBORO HYDROELECTRIC PROJECT
(FERC No. 2602)
SECOND QUARTER 2008 WATER QUALITY
AND SEDIMENT MONITORING REPORT
Prepared for:
DUKE ENERGY CAROLINAS, LLC
Charlotte, North Carolina
Prepared by:
DEVINE TARBELL & ASSOCIATES, INC.
Charlotte, North Carolina
SEPTEMBER 2008
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Devine Tarbell & Associates, Inc.
Consulting Engineers, Scienfisa, & ReguFuoy Specl&tm
DILLSBORO HYDROELECTRIC PROJECT (FERC No. 2602)
SECOND QUARTER 2008 WATER QUALITY AND SEDIMENT
MONITORING REPORT
TABLE OF CONTENTS
Section Title Pay-e No.
EXECUTIVE SUMMARY ................................................................................................ I
SECTION 1 WATER QUALITY SAMPLING LOCATIONS .................................................3
SECTION 2 MONTHLY WATER QUALITY SAMPLING DATA .........................................4
SECTION 3 SECOND QUARTER 2008 SEDIMENT MONITORING AND SUBSTRATE
MAPPING ............................................................................................................. 9
SECTION 4 SECOND QUARTER 2008 HYDROLOGY ANALYSIS ...................................10
SECTION S SECOND QUARTER 2008 SEDIMENT SAMPLING .......................................11
•
APPENDICES
APPENDIX A - MAPS OF WATER QUALITY MONITORING AND SEDIMENT
MONITORING LOCATIONS
APPENDIX B - PHOTOS
APPENDIX C - FLOWS
APPENDIX D - SEDIMENT MONITORING TRANSECTS AND SUBSTRATE MAPPING
APPENDIX E - SEDIMENT SAMPLE ANALYSIS
1?
DILLSBORO HYDROELECTRIC PROJECT (FERC No. 2602)
SECOND QUARTER 2008 WATER QUALITY AND SEDIMENT
MONITORING REPORT
LIST OF TABLES
Table Title Paue No.
TABLE I APPROXIMATE FLOWS (CFS) ............................................................................5
TABLE 2 TEMPERATURE (DEGREES C) ............. ..............................................................5
TABLE 3 DISSOLVED OXYGEN (MG/L) .............. ..............................................................5
TABLE 4 SPECIFIC CONDUCTANCE (µSI) .......... ..............................................................6
TABLE 5 PH (UNITS) ............................................... ..............................................................6
TABLE 6 TURBIDITY (NTU) .................................. ..............................................................6
TABLE 7 TOTAL SUSPENDED SOLIDS (MG/L)* ..............................................................7
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Executive Summary
This report details and summarizes the monthly water quality and quarterly sediment monitoring
results at the Dillsboro Hydroelectric Project (FERC No. 2602) (the Project) for the second
quarter of 2008. The Project is located in southwestern North Carolina on the Tuckasegee River
in Jackson County, and includes a dam, reservoir, and powerhouse. The Dillsboro Dam and
Powerhouse are located at approximately River Mile (RM) 31.6. During the preparation of the
Project relicensing application, a considerable amount of information was obtained on
environmental resources within the Project area. Since that time, a License Surrender
Application was submitted to the FERC, and Duke Energy Carolinas, LLC (Duke Energy) is
taking initiatives to mitigate for the various impacts of decommissioning the Project. The
environmental resource information gathered for the relicensing application is currently being
used by Duke Energy and Devine Tarbell & Associates, Inc. (DTA) for the monitoring program
in preparation for the removal of Dillsboro Dam.
is The Dillsboro Dam removal project includes a three-phase environmental monitoring effort. The
current, or Pre-Removal Phase, is being used to gather baseline information on the variability of
physical, chemical, and biological processes in the Tuckasegee River prior to dam removal. To
capture seasonal effects, this phase has been designed to occur the year prior to, and leading up
to, dam removal. Pre-Removal Phase Monitoring will include the relocation of downstream
mussel populations to areas above the Dillsboro Project with known mussel populations. Dam
Removal Monitoring will take place during the actual dam demolition and removal period, which
will include environmental parameter threshold triggers to maintain ambient conditions. Post-
Dam Removal Monitoring will assess specific physical, chemical, and biological changes in the
Project area to determine when the river system has returned to background ambient conditions.
The current Pre-Removal Phase spans from January to December of 2008 and this report details
the water quality and sediment monitoring portion of the overall environmental monitoring
program. The purpose of the Pre-Removal Phase is to gain an understanding of baseline
conditions, and the associated seasonal variability of those conditions, in the Tuckasegee River
i through the year. The water quality parameters of this study include temperature, dissolved
0 Executive Summary
oxygen (DO), specific conductance, pH, turbidity, and total suspended solids (TSS). These
measurements are being collected monthly to document these baseline conditions, and
ultimately, for comparison with water quality data collected during the removal and post-
removal phases, and for comparison with historical data. The sediment investigation includes
cross-sectional surveys, substrate mapping, and sediment grab sample analysis on a quarterly
basis.
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•
2
Section 1
Water Quality Sampling Locations
The locations of the water quality sampling sites were selected based on agency consultation and
previous study locations. There are nine water quality sampling locations near Dillsboro Dam
(see Figure A-1 in Appendix A). Photos of each water quality sampling location are included in
Appendix B.
The water quality monitoring study includes sections of river both above and below Dillsboro
Dam and covers about 2.5 river miles on the Tuckasegee River.
¦ M-1L and M-1R are below Dillsboro Dam at river mile 31.1. M-11, is located on the left
bank ascending and M-1R is located on the right bank ascending. The right and left banks
at M-1 are monitored separately because of the change in water quality across the river
from the influence of Scotts Creek. Scotts Creek is just upstream of M-1 on the left bank.
¦ M-2 is located in Scotts Creek approximately 0.1 mile upstream of the confluence with the
Tuckasegee River.
¦ M-3 is located just below Dillsboro Dam at river mile 31.5.
¦ M-4 is at river mile 31.7, just above the dam in Dillsboro Pond at river mile 31.7.
¦ M-5L and M-5R are located on the left and right banks ascending, respectively, in a riffle
just upstream of Dillsboro Pond at river mile 32.8 (M-5R was added after the January
sampling trip). The right and left banks at M-5 are monitored separately to study the
influence of the Tuckasegee Water and Sewer Authority (TWSA). TWSA's discharge
point is located just upstream of M-5 on the left bank.
¦ M-6 is located on Savannah Creek, just upstream of the confluence with the Tuckasegee
River.
¦ M-7 is located on the mainstem Tuckasegee River, just upstream of Savannah Creek at
river mile 33.6.
•
3
Section 2
Monthly Water Quality Sampling Data
Mainstem Tuckasegee River flows were recorded at two nearby USGS stream flow measuring
gauges on days when water quality sampling took place. These stream gauges include:
¦ USGS Gauge 03508050 Tuckasegee River at SR 1172 near Cullowhee, NC; and
¦ USGS Gauge 03510577 Tuckasegee River at Barker's Creek, NC.
In addition to flow data collected at USGS gauges, DTA measured the flows of two main
tributaries within the study area: Savannah Creek and Scotts Creek. The approximate flow at
each site at the time that the water quality was measured is provided below in Table 1. Tributary
flows were measured at the same time that water quality sampling took place (Tables C-4 and C-
5 in Appendix Q. The mainstem flows were calculated by prorating flows from the Tuckasegee
River gages at Cullowhee and Barker's Creek. Flow data from the USGS gauges is included in
Tables C-1 to C-3 in Appendix C.
At each of the water quality sampling sites, temperature, DO, specific conductance, pH,
turbidity, and TSS were measured. The water quality sampling parameters are summarized in
Tables 2 through 7. The water quality instrument used in this study was a Hydrolab° MSS. At
the beginning of the second quarter of 2008, the Hydrolab was calibrated in a laboratory,
including a Winkler Titration. DTA checked the calibration of the Hydrolab against known
standards prior to, and after, each sampling trip.
•
4
0 Section 2 Monthly Water Quality Sampling Data
TABLE 1
APPROXIMATE FLOWS (CFS)
Location Description April May June
M-11, River mile 31.1 655 290 495
M-1R River mile 31.1 655 290 495
M-2 Scotts Creek 95 79 39
M-3 River mile 31.5 560 210 455
M-4 River mile 31.7 560 210 455
M-5L River mile 32.8 560 210 455
M-5R River mile 32.8 560 210 455
1-6 Savannah Creek 61 48 25
M-7 River mile 33.6 500 160 430
TABLE 2
TEMPERATURE (DEGREES C)

Location Description April May June
M-IL River mile 31.1 10.9 13.5 20.1
M-1R River mile 31.1 10.6 13.6 20.2
M-2 Scotts Creek 10.7 13.7 20.1
M-3 River mile 31.5 11.2 13.7 20.5
M-4 River mile 31.7 11.5 13.4 20.9
M-5L River mile 32.8 11.8 13.5 20.9
M-5R River mile 32.8 14.6 13.5 19.6
M-6 Savannah Creek 13.5 13.9 21.1
M-7 River mile 33.6 13.8 13.8 21.0
TABLE 3
DISSOLVED OXYGEN (MG/L)
Location Description April May June
M-11- River mile 31.1 10.68 9.99 8.86
M-1R River mile 31.1 10.64 9.77 8.77
M-2 Scotts Creek 10.55 9.77 8.50
M-3 River mile 31.5 10.77 9.83 8.83
M-4 River mile 31.7 10.68 9.95 8.39
M-51, River mile 32.8 10.77 10.06 8.57
M-5R River mile 32.8 9.71 9.88 8.70
M-6 Savannah Creek 10.04 10.03 8.67
M-7 River mile 33.6 10.06 10.13 8.87
0
Section 2 Monthly Water Quality Sampling Data
TABLE 4
SPECIFIC CONDUCTANCE (pSI)
Location Description April May June
M-11, River mile 31.1 26 29 32
M-1R River mile 31.1 20 23 27
M-2 Scotts Creek 20 22 26
M-3 River mile 31.5 20 22 27
M-4 River mile 31.7 24 28 34
M-5L River mile 32.8 18 20 25
M-5R River mile 32.8 28 28 30
1-6 Savannah Creek 24 25 26
M-7 River mile 33.6 36 35 41
TABLE 5
PH (UNITS)
•
Location Description April May June
M-11- River mile 31.1 6.64 6.24 6.71
M-1R River mile 31.1 6.89 6.91 7.25
M-2 Scotts Creek 6.94 6.92 7.11
M-3 River mile 31.5 6.85 6.97 7.16
M-4 River mile 31.7 6.85 6.85 6.96
M-51, River mile 32.8 6.94 7.04 7.35
M-5R River mile 32.8 7.05 6.94 7.25
M-6 Savannah Creek 7.10 7.00 7.25
M-7 River mile 33.6 7.13 7.17 7.63
TABLE 6
TURBIDITY (NTU)
Location Description April May June
M-1 L River mile 31.1 5.9 3.7 14.1
M-1R River mile 31.1 4.1 3.6 12.9
M-2 Scotts Creek 3.6 3.4 11.4
M-3 River mile 31.5 3.4 4.6 7.6
M-4 River mile 31.7 3.2 2.8 9.4
M-5L River mile 32.8 3.0 1.9 9.0
M-5R River mile 32.8 4.7 3.7 7.8
M-6 Savannah Creek 4.4 3.2 6.3
M-7 River mile 33.6 6.7 5.8 6.6
•
0 Section 2 Monthly Water Quality Sampling Data
TABLE 7
TOTAL SUSPENDED SOLIDS (MG/L)*
Location Description April May June
M-1 L River mile 31.1 7 5 20
MAR River mile 3 4 < 4 23
M-2 Scotts Creek 18 8 10
M-3 River mile 31.5 4 < 4 13
M-4 River mile 31.7 < 4 4 9
M-5L River mile 32.8 4 < 4 14
M-5R River mile 32.8 4 < 4 11
M-6 Savannah Creek 7 5 10
M-7 River mile 33.6 4 < 4 12
* Note: Total suspended solids samples were analyzed by the Duke Energy Analytical Laboratory at the McGuire Nuclear Complex in
Huntersville, North Carolina. This laboratory is certified by the North Carolina Division of Water Quality.
According to standards set by the North Carolina Division of Water Quality, the upper end of the
study reach (Savannah Creek to Dillsboro Dam) is classified as Class C freshwaters/trout, and
the study reach below Dillsboro Dam is classified as Class C freshwaters. All of the water
quality parameters collected during the second quarter of 2008 were within the set limits for
Class C freshwaters/trout above the dam and Class C freshwaters below the dam.
As water temperatures warmed from April through June throughout the study reach, DO values
decreased correspondingly. This is because as water warms, it has a reduced capacity to contain
DO. All DO values were still above water quality limits for Class C freshwaters/trout above the
dam (6 mg/L daily average; 5 mg/L daily minimum) and for Class C freshwaters below the dam
(5 mg/L daily average; 4 mg/L daily minimum). Turbidity values were elevated in June,
compared to April and May, but were still within state standards (10 NTUs above the dam and
50 NTUs below the dam). TSS values in June were also higher than in April and May even
though June flows were within the same range as April and May flows. It is possible that land
disturbance activities in the watershed above the study reach contributed to the elevated TSS and
turbidity values. Specific conductance and pH values did not change appreciably during second
quarter 2008 water quality sampling.
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0 Section 2 Monthly Water Quality Sampling Data
As part of the Pre-Removal Phase Monitoring study, DTA plans to collect water quality data in a
variety of flows, including a stormwater runoff event. This will demonstrate how the water
quality in the Tuckasegee River changes during normal seasonal storm events.
•

• Section 3
Second Quarter 2008 Sediment Monitoring and
Substrate Mapping
This study includes 17 sediment monitoring transects on the Tuckasegee River between river
miles 12.2 and 32.8 (see Figure A-2 in Appendix A). The transect locations were selected based
on previous study locations, known mussel locations, and aquatic characterization (i.e., pool and
riffle/run type aquatic habitats). DTA paired each pool transect with a riffle/run transect to
examine sediment changes and scour and deposition patterns on a seasonal basis throughout the
downstream reach. The riffle/run transects were located in areas typical of those where the
endangered Appalachian Elk toe mussel are found. Photos of each cross-section are included in
Appendix B. Cross-sectional surveys and substrate mapping were performed at these transects
during the second quarter of 2008. This data collection during the pre-removal monitoring phase
will provide a baseline understanding of sediment composition in the Tuckasegee River.
The cross-sectional profiles are summarized in Figures D-1 through D-17 in Appendix D. These
charts illustrate the cross-sectional profiles for the second quarter of 2008. This Pre-Removal
Phase Monitoring will demonstrate seasonal fluctuations in sediment composition on the
Tuckasegee River.
•
9
Section 4
Second Quarter 2008 Hydrology Analysis
Mainstem Tuckasegee River flows and flows from a nearby tributary were recorded at several
USGS stream flow measuring gauges. These stream gauges include:
¦ USGS Gauge 03508050 Tuckasegee River at SR 1172 near Cullowhee, NC;
¦ USGS Gauge 03510577 Tuckasegee River at Barker's Creek, NC;
¦ USGS Gauge 03512000 Oconaluftee River at Birdtown, NC; and
¦ USGS Gauge 03513000 Tuckasegee River at Bryson City, NC.
Graphs of flow versus time for the four gauges used in this study are shown in Figures C-1
through C-4 in Appendix C.
0
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• Section 5
Second Quarter 2008 Sediment Sampling
A representative sediment grab sample was collected at each of the 17 sediment monitoring
transects during the fourth quarter of 2007 and the first and second quarters of 2008. The grab
samples were collected from the upper two inches of the riverbed. The samples were tested and
analyzed by Summit Laboratories, an AASHTO R18 accredited geotechnical laboratory located
in Fort Mill, South Carolina. The sediment grab samples were tested in accordance with ASTM
D 422 (without hydrometer) to obtain a particle size distribution. Particle size distribution
graphs and fractional components charts for each of the 17 transects are located in Figures E-1
through E-34 in Appendix E. Each graph and chart includes curves representing the sampling
trips during the fourth quarter 2007, and first and second quarters of 2008.
In general, the particle size distribution curves were similar from the fourth quarter of 2007 to
the second quarter of 2008. Pool transects typically contain a high percentage of sands and fines
(silts and clays). The sediment from transects in Dillsboro Pond (T-13 through T-16) had a
majority of fine sand and fines, with coarser materials at the upper transect (T-16) and gradually
finer materials closer to the dam (T-13). This is typical of sediment deposition patterns behind
dams where larger particles fall out in the upper end of the impoundment as velocities first start
to decrease.
Riffle/run transects typically contain a wider range of substrates from coarse gravel to fines.
Most of the riffle/run transects exhibit similar percentages of individual substrate types from the
fourth quarter of 2007 to the second quarter of 2008. There are, however, some exceptions
where the particle size distribution curves and fractional components charts differed among the
three sampling events. Because these differences are typically in the larger substrate sizes (i.e.,
small, medium, and large gravel), they are likely due to sampling inconsistencies. For example,
adding a few extra pieces of gravel to a sample can result in significant differences in the particle
size distribution (PSD) of the sample from one quarter to the next. Further evidence that this is
due to sampling inconsistencies is based on inspection of cross-section profiles at transects
where sediment grab samples are showing some of these differences (e.g., Transects 1, 2, and 6).
i These transects are not undergoing significant changes in cross-sectional profile (scour or
0 Section 5 Second Quarter 2008 Sediment Sampling
deposition) from one quarter to the next. Therefore, it is unlikely that larger substrate sizes are
being transported downstream. Adjustments in sampling techniques are being made to improve
sediment grab sampling consistency to obtain representative grab samples for each transect.
The results of the Pre-Removal Phase Monitoring for the fourth quarter of 2007 and the first and
second quarters of 2008 provide background data that shows characteristics of the Tuckasegee
River under normal seasonal conditions. The water quality monitoring will be performed under
the natural range of flows in the future to demonstrate the fluctuations in the river during and
after storm events. The sediment monitoring study will supply background data to show how
different flow conditions in the Tuckasegee River affect sediment scour and deposition. This
data will be used to contrast characteristics of the Tuckasegee River before and after the dam
removal.
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12
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APPENDICES
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APPENDIX A
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MAPS OF WATER QUALITY MONITORING AND SEDIMENT
MONITORING LOCATIONS
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APPENDIX B
PHOTOS
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Photo B-1: M-1L and M-1R, Below Scott's Creek (RM 31.1)
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Photo B-2: M-2, Scott's Creek
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Photo B-3: M-3, Below Dillsboro Dam (RM 31.5)
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Photo B-4: M-4, Dillsboro Pond (RM 31.7)

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Photo B-5: M-5L and M-5R, Above Dillsboro Pond (RM 32.8)
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Photo B-6: M-6, Savannah Creek
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Photo B-7: M-7, Above Savannah Creek (RM 33.6)
Photo B-8: T-1
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Photo B-9: T-2
Photo B-10: T-3
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Photo B-11: T-4
Photo B-12: T-5
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Photo B-13: T-6
Photo B-14: T-7
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Photo B-15: T-8
Photo B-16: T-9
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Photo B-17: T-10
Photo B-18: T-11
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Photo B-19: T-12
Photo B-20: T-13
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Photo B-21: T-14
Photo B-22: T-15
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Photo B-23: T-16
Photo B-24: T-17
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APPENDIX C
FLOWS
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11
Below are tables that provide recorded flows at these USGS stream gauges. The date of the
sampling trip is included, as well as the weather conditions.
TABLE C-1
FLOWS ON APRIL 29, 2008
Weather Conditions: Sunny, 75 degrees
Cullowhee Barker's Creek Oconaluftee B son City
Time Stage
ft Discharge
cfs Stage
ft Discharge
cfs Stage
ft Discharge
cfs Stage
ft Discharge
cfs
13:00 4.81 252 4.49 876 1.78 458 2.83 1,650
13:15 4.80 249 4.48 869 1.78 458 2.83 1,650
13:30 4.83 258 4.44 839 1.78 458 2.82 1,640
13:45 4.83 258 4.40 810 1.77 453 2.82 11640
14:00 4.84 261 4.36 782 1.77 453 2.82 1,640
14:15 4.82 255 4.32 755 1.77 453 2.81 1,630
14:30 4.79 246 4.27 721 1.76 447 2.81 1,630
14:45 4.67 212 4.23 696 1.77 453 2.81 1,630
15:00 4.56 182 4.18 664 1.76 447 2.81 1,630
15:15 4.44 151 4.14 640 1.76 447 2.80 1,610
15:30 4.34 128 4.11 622 1.75 441 2.80 1,610
15:45 4.25 108 4.09 610 1.75 441 2.81 1,630
16:00 4.19 96 4.05 587 1.75 441 2.82 1,640
16:15 4.15 88 4.03 576 1.75 441 2.85 1,680
16:30 4.12 83 4.00 559 1.75 441 2.87 1,700
16:45 4.09 78 3.97 543 1.75 441 2.87 1,700
17:00 4.04 69 3.96 537 1.74 436 2.88 1,720
TABLE C-2
FLOWS ON MAY 14, 2008
Weather Conditions: Sunny, 80 degrees
•
Cullowhee Barker's Creek Oconaluftee Br son City
Time Stage
ft Discharge
cfs Stage
ft Discharge
cfs Stage
ft Discharge
cfs Stage
ft Discharge
cfs
10:00 5.40 460 3.65 388 1.72 425 2.37 1,020
10:15 5.41 464 3.72 419 1.72 425 2.35 1,000
10:30 5.38 452 3.75 433 1.72 425 2.35 1,000
10:45 5.39 456 3.77 442 1.71 419 2.34 989
11:00 5.40 460 3.78 447 1.72 425 2.33 979
11:15 5.40 460 3.78 447 1.72 425 2.32 968
11:30 5.41 464 3.78 447 1.72 425 2.32 968
11:45 5.39 456 3.78 447 1.72 425 2.30 947
12:00 5.40 460 3.78 447 1.72 425 2.30 947
12:15 5.39 456 3.79 451 1.72 425 2.28 927
12:30 5.39 456 3.78 447 1.72 425 2.28 927
12:45 5.40 460 3.78 447 1.72 425 2.28 927
13:00 5.39 456 3.78 447 1.72 425 2.28 927
13:15 5.38 452 3.77 442 1.72 425 2.28 927
13:30 5.37 448 3.77 442 1.71 419 2.28 927
13:45 5.36 444 3.75 433 1.72 425 2.27 917
14:00 5.38 452 3.74 428 1.71 419 2.27 917
14:15 5.37 448 3.72 419 1.71 419 2.26 907
14:30 5.38 452 3.71 415 1.71 419 2.26 907
14:45 5.37 448 3.69 406 1.71 419 2.26 907
15:00 5.38 452 3.67 397 1.71 419 2.27 917
TABLE C-3
FLOWS ON JUNE 25, 2008
Weather Conditions: Sunny 95 degrees
Cullowhee Barker's Creek Oconaluftee B son City
Time Stage
ft Discharge
cfs Stage
ft Discharge
cfs Stage
ft Discharge
cfs Stage
ft Discharge
cfs
10:00 4.07 74 3.04 183 1.04 146 1.68 397
10:15 4.04 69 3.04 183 1.04 146 1.68 397
10:30 4.00 63 3.04 183 1.04 146 1.68 397
10:45 3.98 60 3.04 183 1.04 146 1.68 397
11.00 3.95 55 3.03 181 1.04 146 1.68 397
11:15 3.93 52 3.04 183 1.04 146 1.68 397
11:30 3.91 49 3.03 181 1.05 149 1.67 390
11:45 3.89 47 3.17 218 1.05 149 1.67 390
12:00 3.88 45 3.78 447 1.04 146 1.67 390
12:15 3.86 42 3.94 527 1.05 149 1.67 390
12:30 3.85 41 3.97 543 1.05 149 1.67 390
12:45 3.85 41 3.98 548 1.04 146 1.67 390
13:00 3.84 40 3.98 548 1.04 146 1.67 390
13:15 3.81 36 3.98 548 1.05 149 1.67 390
13:30 3.80 34 3.98 548 1.05 149 1.67 390
13:45 3.80 34 3.98 548 1.04 146 1.67 390
14:00 3.79 33 3.96 537 1.05 149 1.67 390
14:15 3.80 34 3.95 532 1.05 149 1.67 390
14:30 3.79 33 3.92 516 1.05 149 1.67 390
14:45 3.79 33 3.90 506 1.05 149 1.67 390
15:00 3.79 33 3.87 491 1.05 149 1.67 390
In addition, tributary flows near Dillsboro Dam were measured manually during water quality
sampling events on Savannah Creek and Scotts Creek.
TABLE C-4
SAVANNAH CREEK FLOW MEASUREMENT
Date and Time Flow (cfs)
4/29/08 15:30 61
5/14/08 14:15 48
6/25/08 14:00 25
TABLE C-5
SCOTTS CREEK FLOW MEASUREMENT
Date and Time Flow (cfs)
4/29/08 16:30 95
5/14/08 15:15 79
6/25/08 15:15 39
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