Catawba-Wateree 2022 Annual FERC Compliance Report- Final 630.2023

V
� DUKE
ENERGY
June 30, 2023
The Honorable Kimberly D. Bose, Secretary
Federal Energy Regulatory Commission
888 First Street, N.E.
Washington, DC 20426
RE: Duke Energy Carolinas, LLC
Catawba-Wateree Hydro Project No. P-2232
2022 Annual License Compliance Report
Dear Secretary Bose:
WATER STRATEGY, HYDRO LICENSING &
LAKE SERVICES
Duke Energy Corporation
Regulated and Renewable Energy
526 South Church Street IEC12Q
Charlotte, NC 28202
The Duke Energy Carolinas, LLC (Duke Energy) Catawba-Wateree Hydroelectric Project No. 2232
(Project) License', Appendix E, A-5.0, Article - Water Quality Monitoring Plan, and License Appendix
E, A-6.0, Article - Flow and Reservoir Elevation Monitoring, requires Duke Energy to submit
compliance reports each year.
The enclosed 2022 Compliance Report for Reservoir Elevations, Flow Releases, and Water Quality
(Annual Report) is submitted to comply with the combined applicable requirements of both the
preceding License Articles. Please note the Appendix Tables accompanying the report, which include
tabulations of Project reservoir elevation, flow release, and water quality data, are submitted in
Microsoft ExcelO file format.
This report has been provided to the N.C. Department of Environmental Quality, Division of Water
Resources, N.C. Wildlife Resources Commission, S.C. Department of Natural Resources, S.C.
Department of Health and Environmental Control, the U.S. Fish and Wildlife Service, the National
Marine Fisheries Service, and the U.S. Environmental Protection Agency.
Please direct questions to me at [phone] ([e-mail]).
Sincerely,
Tami Styer, Senior Project Manager
Water Strategy, Hydro Licensing & Lake Services
Duke Energy
Enclosure
' Issued November 25, 2015; Accession No. 20151125-3023

The Honorable Kimberly D. Bose, Secretary
June 30, 2023
Page 2 of 2
cc w/ enclosures:
Fred Tarver, NC Department of Environmental Quality
Chonticha McDaniel, NC Department of Environmental Quality
Chris Wood, NC Wildlife Resources Commission
Bryan Tompkins, US Fish and Wildlife Service
Elizabeth Miller, SC Department of Natural Resources
Chuck Hightower, SC Department of Health and Environmental Control
Rusty Wenerick, SC Department of Health and Environmental Control
Twyla Cheatwood, National Marine Fisheries Service
Fritz Rhode, National Marine Fisheries Service
Melanie Olds, U.S. Fish and Wildlife Service
Chris Militscher, U.S. Environmental Protection Agency
Randy Herrin, Duke Energy
Lynne Dunn, Duke Energy
Jeff Lineberger, Duke Energy
Phil Fragapane, Duke Energy
Garry Rice, Duke Energy
Sarah Santos, Duke Energy
Alan Madewell, Duke Energy

ENCLOSURE
Catawba-Wateree Hydroelectric Project — FERC No. 2232
2022 Annual License Compliance Report

2022 Catawba-Wateree Hydroelectric Project
Compliance Report
Reservoir Elevation, Flow, and Water Quality
FERC Project Number 2232
Duke Energy Carolinas, LLC
June 2023
DUKE
ENERGY

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Table of Contents
1 Introduction...............................................................................................................................7
1.1
License Article Requirements............................................................................................................7
1.2
CRA Requirements............................................................................................................................8
1.3
Status of FWQIP Physical Modifications and WQMP Requirements
in 2022...................................9
2 Development -Specific Article Requirements..............................................................................10
2.1
Bridgewater Development..............................................................................................................10
2.2
Rhodhiss Development...................................................................................................................13
2.3
Oxford Development.......................................................................................................................13
2.4
Lookout Shoals Development.........................................................................................................14
2.5
Cowans Ford Development.............................................................................................................15
2.6
Mountain Island Development.......................................................................................................16
2.7
Wylie Development.........................................................................................................................17
2.8
Fishing Creek Development............................................................................................................19
2.9
Great Falls -Dearborn Development................................................................................................20
2.10 Rocky Creek -Cedar Creek Development.........................................................................................21
2.11
Wateree Development....................................................................................................................22
3 Methods...................................................................................................................................25
3.1
Reservoir Elevation Article Compliance Assessment......................................................................25
3.2
Flow Article Compliance Assessment..............................................................................................25
3.3
Water Quality Compliance Assessment..........................................................................................26
4 Results and Discussion..............................................................................................................27
4.1
Elevation Article Compliance..........................................................................................................27
4.2
Flow Article Compliance..................................................................................................................39
4.3
Water Quality Article Compliance...................................................................................................63
5 References.............................................................................................................................101
Tables
Table 2-1. Bridgewater Development Normal Minimum Reservoir Elevations for Lake James.................10
Table 2-2. Bridgewater Development Tailrace Minimum Continuous Flow Release Requirements . ........ 11
Table 2-3. Bridgewater Development Catawba River Bypassed Reach Minimum Continuous Flow Release
Requirements....................................................................................................................................11
Table 2-4. Bridgewater Development Recreational Flow Release Requirements ...................................... 12
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Table 2-5. Cowans Ford Normal Minimum Reservoir Elevations for Lake Norman ................................... 15
Table 2-6. Wylie Development Recreational Flow Release Requirements ................................................. 18
Table 2-7. Wateree Development Normal Minimum Reservoir Elevations for Lake Wateree.................. 22
Table 4-1. Summary of Reservoir Elevation Article Deviations in 2022 and Dates of FERC Notification... 27
Table 4-2. Summary of Flow Article Deviations in 2022 and Dates of FERC Notification ........................... 39
Table 4-3. Summary of All Water Quality Article Deviations in 2022......................................................... 63
Table 4-4. Selection of DO data from Wateree Tailrace and unit generation status demonstrating
compliance with Interim Measures for Providing DO Enhancement. Full data are included in
AppendixD-1...................................................................................................................................100
Figures
Figure 4-1. Bridgewater Development: Lake James Hourly Surface Elevations, January 1-December 31,
2022...................................................................................................................................................
28
Figure 4-2. Rhodhiss Development: Lake Rhodhiss Hourly Surface Elevations, January 1-December 31,
2022...................................................................................................................................................
29
Figure 4-3. Oxford Development: Lake Hickory Hourly Surface Elevations, January 1-December 31, 2022.
...........................................................................................................................................................
30
Figure 4-4. Lookout Shoals Development: Lookout Shoals Lake Hourly Surface Elevations, January 1-
December31, 2022...........................................................................................................................
31
Figure 4-5. Cowans Ford Development: Lake Norman Hourly Surface Elevations, January 1-December 31,
2022...................................................................................................................................................
32
Figure 4-6. Mountain Island Development: Mountain Island Lake Hourly Surface Elevations, January 1-
December31, 2022...........................................................................................................................
33
Figure 4-7. Wylie Development: Lake Wylie Hourly Surface Elevations, January 1-December 31, 2022...
34
Figure 4-8. Fishing Creek Development: Fishing Creek Reservoir Hourly Surface Elevations, January 1-
December31, 2022...........................................................................................................................
35
Figure 4-9. Great Falls -Dearborn Development: Great Falls Reservoir Hourly Surface Elevations, January
1-December 31, 2022........................................................................................................................
36
Figure 4-10. Rocky Creek -Cedar Creek Development: Cedar Creek Reservoir Hourly Surface Elevations,
January1-December 31, 2022..........................................................................................................
37
Figure 4-11. Wateree Development: Lake Wateree Hourly Surface Elevations, January 1-December 31,
2022...................................................................................................................................................
38
Figure 4-12. Bridgewater Development: Flows measured in the Bridgewater Hydroelectric Station
Tailrace at USGS Gaging Station 02138520, January 1-December 31, 2022....................................40
Figure 4-13. Bridgewater Development: Flows measured in the Bridgewater Catawba River Bypassed
Reach at USGS Gaging Station 02138816, January 1-December 31, 2022.......................................40
Figure 4-14. Bridgewater Development: The figure above is excerpted from Figure 4-13 for closer
examination......................................................................................................................................
41
Figure 4-15. Bridgewater Development: Total flow released from the Bridgewater Development (sum of
Bridgewater Hydro Tailrace and Catawba River Bypassed Reach flows), January 1-December 31,
2022, to support Public Water Supply and Industrial Processes Article...........................................41
Figure 4-16. Bridgewater Development: Recreational flows released for the purpose of float angling,
April -October 2022. Flows were measured at USGS Gaging Station 02138520 ...............................
42
Figure 4-17. Bridgewater Development: Recreational flows released for the purpose of paddling, April -
October 2022. Flows were measured at USGS Gaging Station 02138520........................................43
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2022 Catawba-Wateree Hydroelectric Project Compliance Report
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Figure 4-18. Bridgewater Development: Recreational flows released for the purpose of migratory bird
hunting, October 21-22, 2022. Flows were measured at USGS Gaging Station 02138520..............
44
Figure 4-19. Rhodhiss Development: Average daily flows released at the Rhodhiss Development January
1-December 31, 2022........................................................................................................................45
Figure 4-20. Rhodhiss Development: Average weekly flows released at the Rhodhiss Development
January1-April 30, 2022. ..................................................................................................................
45
Figure 4-21. Oxford Development: Flows measured at USGS Gaging Station 0214196125 in the Oxford
tailrace, January 1-December 31, 2022............................................................................................46
Figure 4-22. Oxford Development: Recreational flows measured at USGS Gaging Station 0214196125 in
the Oxford tailrace, May -October 2022............................................................................................46
Figure 4-23. Lookout Shoals Development: Flows measured at USGS Gaging Station 0214244102 in the
Lookout Shoals Tailrace, January 1-December 31, 2022..................................................................47
Figure 4-24. Cowans Ford Development: Average daily flows released January 1-December 31, 2022.
Flows were calculated based on generation data.............................................................................48
Figure 4-25. Mountain Island Development: Average daily flows released January 1-December 31, 2022.
Flows were calculated based on generation data.............................................................................49
Figure 4-26. Wylie Development: Wylie Tailrace flows recorded at USGS Gaging Station 02145910,
January1-December 31, 2022..........................................................................................................
50
Figure 4-27. Wylie Development: Recreational flows recorded at USGS Gaging Station 02145910, located
0.5 miles downstream of Wylie, April -October 2022.......................................................................
51
Figure 4-28. Wylie Development: Flows supporting public water supply and industrial processes
recorded at USGS Gaging Station 02147020, located 19 miles downstream of the Wylie Tailrace,
January -December 2022...................................................................................................................
52
Figure 4-29. Wylie Development: Weekly average flows supporting public water supply and industrial
processes recorded at USGS Gaging Station 02146000, located 3.5 miles downstream of the Wylie
Tailrace, January -December 2022.....................................................................................................
53
Figure 4-30. Fishing Creek Development: Average daily flows released by the Fishing Creek
Development, January 1-December 31, 2022...................................................................................
54
Figure 4-31. Rocky Creek -Cedar Creek Development: Average daily flows released January 1-December
31, 2022.............................................................................................................................................
55
Figure 4-32. Wateree Development: Wateree FWQIP Interim Flow Measures recorded at Wateree
Tailrace from January 1— February 14 and during required continuous 1-unit generation period
(February 15 — May 15).....................................................................................................................
56
Figure 4-33. Wateree Development: Wateree FWQIP Interim Flow Measure recorded at Wateree
Tailrace from (a) May 16—June 15, (b) June 16—July 15, and (c) July 16 —August 15. ..................
57
Figure 4-34. Wateree Development: Wateree FWQIP Interim Flow Measure recorded at Wateree
Tailrace from (a) August 16 — September 15, (b) September 16 - October 15, (c) October 16 —
November15.....................................................................................................................................
58
Figure 4-35. Wateree Development: Wateree FWQIP Interim Flow Measure recorded at Wateree
Tailrace from November 16 — December 31, 2022...........................................................................
59
Figure 4-36. Wateree Development: Recreational flows released by the Wateree Development from
10:00 to 15:00 on recreational flow release dates, April -October 2022..........................................
60
Figure 4-37. Wateree Development: Flows measured at USGS Gaging Station 02148000 from 12:30-
17:30, allowing 2.5 hours for recreational flows released 10:00-15:00 at the Wateree
Development to be fully manifested 7.4 miles downstream at USGS Gaging Station 02148000....
61
Figure 4-38. Wateree Development: Wateree Flows supporting public water supply and industrial
processes recorded at USGS Gaging Station 02148000, January 1-December 31, 2022..................
62
Figure 4-39. Example boxplot for representing water quality datasets in this report ...............................
64
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2022 Catawba-Wateree Hydroelectric Project Compliance Report
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Figure 4-40. Bridgewater Development: Summary of instantaneous dissolved oxygen (DO)
concentrations recorded in the Bridgewater Tailrace at USGS Water Quality Monitoring Station
02138520, April 1-November 30, 2022............................................................................................. 65
Figure 4-41. Bridgewater Development: Summary of daily average dissolved oxygen (DO) concentrations
recorded in the Bridgewater Tailrace at USGS Water Quality Monitoring Station 02138520, April 1-
November30, 2022........................................................................................................................... 66
Figure 4-42. Bridgewater Development: Summary of instantaneous water temperature recorded in the
Bridgewater Tailrace at USGS Water Quality Monitoring Station 02138520, April 1-November 30,
2022................................................................................................................................................... 67
Figure 4-43. Rhodhiss Development: Summary of instantaneous dissolved oxygen (DO) concentrations
recorded in the Rhodhiss Tailrace at USGS Water Quality Monitoring Station 02141500 while
Rhodhiss Hydro Station was generating, April 1-November 30, 2022.............................................. 68
Figure 4-44. Rhodhiss Development: Summary of daily averages of dissolved oxygen (DO) concentrations
recorded in the Rhodhiss Tailrace while Rhodhiss Hydro Station was generating, April 1-November
30, 2022............................................................................................................................................. 69
Figure 4-45. Rhodhiss Development: Summary of instantaneous temperatures recorded in the Rhodhiss
Tailrace at USGS Water Quality Monitoring Station 02141500 while Rhodhiss Hydro Station was
generating, April 1-November 30, 2022............................................................................................ 70
Figure 4-46. Oxford Development: Summary of instantaneous dissolved oxygen (DO) concentrations
recorded in the Oxford Tailrace at USGS Water Quality Monitoring Station 0214196125, April 1-
November30, 2022........................................................................................................................... 71
Figure 4-47. Oxford Development: Instantaneous dissolved oxygen (DO) concentrations recorded in the
Oxford Tailrace at USGS Water Quality Monitoring Station 0214196125, August 1-August 31, 2022
a showing brief instantaneous exceedance on August 16, 2022...................................................... 72
Figure 4-48. Oxford Development: Summary of daily average dissolved oxygen (DO) concentrations
recorded in the Oxford Tailrace at USGS Water Quality Monitoring Station 0214196125, April 1-
November30, 2022........................................................................................................................... 73
Figure 4-49. Oxford Development: Summary of instantaneous temperatures recorded in the Oxford
Tailrace at USGS Water Quality Monitoring Station 0214196125, April 1-November 30, 2022...... 74
Figure 4-50. Lookout Shoals Development: Summary of instantaneous dissolved oxygen (DO)
concentrations recorded in the Lookout Shoals Tailrace at USGS Water Quality Monitoring Station
0214244102, April 1-November 30, 2022......................................................................................... 75
Figure 4-51. Lookout Shoals Development: Summary of daily average dissolved oxygen (DO)
concentrations recorded in the Lookout Shoals Tailrace at USGS Water Quality Monitoring Station
0214244102, April 1-November 30, 2022......................................................................................... 76
Figure 4-52. Lookout Shoals Development: Summary of instantaneous tailrace temperatures recorded in
the Lookout Shoals Tailrace at USGS Water Quality Monitoring Station 0214244102, April 1-
November 30, 2022
77
Figure 4-53. Cowans Ford Development: Summary of instantaneous dissolved oxygen (DO)
concentrations recorded in the Cowans Ford Tailrace at USGS Water Quality Monitoring Station
0214264790 when Cowans Ford Hydro Station was generating, April 1-November 30, 2022........ 78
Figure 4-54. Cowans Ford Development: Tailrace instantaneous dissolved oxygen (DO) concentrations
from July 1-August 1, 2022, documenting deviations from the North Carolina instantaneous DO
standard of 4.0 mg/L or greater while Cowans Ford Hydro Station was generating ........................ 79
Figure 4-55. Cowans Ford Development: Summary of daily averages of DO concentrations recorded at
USGS Water Quality Monitoring Station 0214264790 in the Cowans Ford Tailrace while Cowans
Ford Hydro Station was generating, April 1-November 30, 2022..................................................... 80
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2022 Catawba-Wateree Hydroelectric Project Compliance Report
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Figure 4-56. Cowans Ford Development: Daily averages of DO concentrations recorded at USGS Water
Quality Monitoring Station 0214264790 in the Cowans Ford Tailrace while Cowans Ford Hydro
Station was generating, July 1-July31, 2022, documenting one deviation from the North Carolina
standard of 5.0 mg/I or greater for daily average DO....................................................................... 81
Figure 4-57. Cowans Ford Development: Summary of instantaneous temperatures recorded in the
Cowans Ford Tailrace at USGS Water Quality Monitoring Station 0214264790 while Cowans Ford
Hydro Station was generating, April 1-November 30, 2022............................................................. 82
Figure 4-58. Mountain Island Development: Summary of instantaneous dissolved oxygen (DO)
concentrations recorded in the Mountain Island tailrace at USGS Water Quality Monitoring Station
0214267602 while Mountain Island Hydro Station was generating, April 1-November 30, 2022... 83
Figure 4-59. Mountain Island Development: Summary of daily averages of dissolved oxygen (DO)
concentrations recorded at USGS Water Quality Monitoring Station 0214267602 in the Mountain
Island Tailrace while Mountain Island Hydro Station was generating, April 1-November 30, 2022.84
Figure 4-60. Mountain Island Development: Summary of instantaneous temperatures recorded in the
Mountain Island tailrace at USGS Water Quality Monitoring Station 0214267602 while Mountain
Island Hydro Station was generating, April 1-November 30, 2022................................................... 85
Figure 4-61. Wylie Development: Summary of instantaneous tailrace dissolved oxygen (DO)
concentrations recorded in the Wylie Tailrace at USGS Water Quality Monitoring Station
02145910, April 1-November 30, 2022............................................................................................. 86
Figure 4-62. Wylie Development: Summary of daily average dissolved oxygen (DO) concentrations
recorded in the Wylie Tailrace at USGS Water Quality Monitoring Station 02145910, April 1-
November30, 2022........................................................................................................................... 87
Figure 4-63. Wylie Development: Summary of instantaneous tailrace temperatures recorded in the
Wylie tailrace at USGS Water Quality Monitoring Station 02145910, April 1-November 30, 2022. 88
Figure 4-64. Fishing Creek Development: Summary of instantaneous dissolved oxygen (DO)
concentrations recorded in the Fishing Creek tailrace at USGS Water Quality Monitoring Station
02147310 while Fishing Creek Hydro Station was generating, April 1-November 30, 2022............ 89
Figure 4-65. Fishing Creek Development: Instantaneous dissolved oxygen (DO) concentrations recorded
in the Fishing Creek Tailrace at USGS Water Quality Monitoring Station 02147310 while Fishing
Creek Hydro Station was generating, June 1-July 31, 2022, demonstrating deviations from the
South Carolina >_ 4.0 mg/L instantaneous DO standard.................................................................... 90
Figure 4-66. Fishing Creek Development: Summary of daily averages of dissolved oxygen (DO)
concentrations recorded in the Fishing Creek Tailrace at USGS Water Quality Monitoring Station
02147310 while Fishing Creek Hydro Station was generating, April 1-November 30, 2022............ 91
Figure 4-67. Fishing Creek Development: Summary of instantaneous temperatures recorded in the
Fishing Creek Tailrace at USGS Water Quality Monitoring Station 02147310 while Fishing Creek
Hydro Station was generating, April 1-November 30, 2022............................................................. 92
Figure 4-68. Great Falls -Dearborn Development: Summary of instantaneous dissolved oxygen (DO)
concentrations recorded in the Great Falls -Dearborn Tailrace at USGS Water Quality Monitoring
Station 021474095 while Dearborn Hydro Station was generating, April 1-November 30, 2022.... 93
Figure 4-69. Great Falls -Dearborn Development: Summary of daily averages of tailrace dissolved oxygen
(DO) concentrations recorded in the Great Falls -Dearborn tailrace at USGS Water Quality
Monitoring Station 021474095 while Dearborn Hydro Station was generating, April 1-November
30, 2022............................................................................................................................................. 94
Figure 4-70. Great Falls -Dearborn Development: Summary of instantaneous temperatures recorded in
the Great Falls -Dearborn Tailrace at USGS Water Quality Monitoring Station 021474095 while
Dearborn Hydro Station was generating, April 1-November 30, 2022............................................. 95
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2022 Catawba-Wateree Hydroelectric Project Compliance Report
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Figure 4-71. Rocky Creek -Cedar Creek Development: Summary of instantaneous dissolved oxygen (DO)
concentrations recorded in the Cedar Creek Tailrace at USGS Water Quality Monitoring Station
02147505 while Cedar Creek Hydro Station was generating, April 1-November 30, 2022.............. 96
Figure 4-72. Rocky Creek -Cedar Creek Development: Summary of daily averages of dissolved oxygen
(DO) concentrations recorded in the Cedar Creek Tailrace at USGS Water Quality Monitoring
Station 02147505 while Cedar Creek Hydro Station was generating, April 1-November 30, 2022. 97
Figure 4-73. Rocky Creek -Cedar Creek Development: Summary of instantaneous temperatures recorded
in the Cedar Creek Tailrace at USGS Water Quality Monitoring Station 02147505 while Cedar Creek
Hydro Station was generating, April 1-November 30, 2022............................................................. 98
Figure 4-74. Wateree Development: Instantaneous dissolved oxygen (DO) concentrations recorded in
the Wateree Tailrace between June 1-October 31, 2022................................................................. 99
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2022 Catawba-Wateree Hydroelectric Project Compliance Report
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1 Introduction
On November 25, 2015, the Federal Energy Regulatory Commission (FERC or Commission) issued a
License to Duke Energy Carolinas, LLC (Duke Energy), for the continued operation of the Catawba-
Wateree Hydroelectric Project No. 2232 (CW Project or Project).
According to the License, Duke Energy is required to submit an annual report detailing operational
compliance with License articles during the previous year. This annual report for calendar year 2022 is
submitted in compliance with the reporting requirements, as specified in the following License
Articles.
1.1 License Article Requirements
Article — Water Quality Monitoring Plan, Paragraph (D) (License Appendix E, A-5.0)
By June 30 following each full calendar year for the term of this license, the Licensee must file
with the Commission a report verifying compliance with any applicable 401 Water Quality
Certification conditions, and must include in its filing the following information for the previous
calendar year:
(i) temperatures of water released from Project developments;
(ii) dissolved oxygen (DO) concentrations in water released from Project developments,
(iii) Minimum Continuous Flows released from the Bridgewater, Oxford, Lookout Shoals,
Wylie, and Wateree developments;
(iv) Minimum Continuous Flows released into the Great Falls Long and Short Bypassed
Reaches; and
(v) documentation of instances that the 401 Water Quality Certification requirements
were not met, along with any proposed or implemented corrective actions.
Article — Flow and Reservoir Elevation Monitoring, (License Appendix E, A-6.0)
Licensee must file with the Commission a report verifying compliance with the Normal Minimum
Elevation and Normal Maximum Elevation for Reservoir Levels, Spring Reservoir Level
Stabilization Program, Recreational Flow Releases, Minimum Continuous Flows, Minimum
Average Daily Flows, and the Wylie High Inflow Protocol, as set forth in this license. The Licensee
must include, at least, the following information for the previous calendar year:
(i) hourly flow records at Bridgewater, Oxford, Lookout Shoals, Wylie, and Wateree;
(ii) documentation of flow releases in the Catawba River Bypassed Reach, as well as the
Great Falls Long and Short Bypassed Reaches;
(iii) documentation of Recreational Flow Releases;
(iv) documentation of Minimum Continuous Flows and Minimum Average Daily Flows;
(v) hourly reservoir levels for each reservoir, along with yearly graphs showing the actual
levels throughout the calendar year; and
(vi) documentation of any instances that reservoir levels exceeded the Normal Operating
Ranges, any instances where the Spring Reservoir Level Stabilization Program
requirements or required flow releases were not met, along with any proposed or
implemented corrective actions.
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2022 Catawba-Wateree Hydroelectric Project Compliance Report
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Article — Flow and Water Quality Implementation Plan, Paragraph (A) (License Appendix E, A-
2.0)
Within 180 days following the issuance of this license, the Licensee must file with the
Commission, for approval, a Flow and Water Quality Implementation Plan (FWQIP) for
completing the modifications necessary to satisfy the flow and water quality requirements at
Project developments. The Plan shall include, at a minimum:
(i) descriptions of any equipment, including flow release valves, minimum flow hydro
units, or aerating hydro units to be installed
(ii) descriptions of any proposed modifications to any Project structures to provide
prescribed flow releases or meet the requirements of the 401 Water Quality
Certifications, and
(iii) a schedule for the installations and modifications to meet the prescribed flow
releases or water quality requirements stipulated in this license.
Article — Water Quality Monitoring Plan, Paragraph (A) (License Appendix E, A-5.0)
Within 180 days following the issuance of this license, the Licensee must file with the
Commission, for approval, a Water Quality Monitoring Plan (WQMP) to monitor compliance with
water quality requirements. The plan must include, at a minimum, identification of compliance
monitoring locations and devices at applicable Project developments as needed to accurately
monitor and record flows, dissolved oxygen, and water temperatures released from Project
developments and an implementation schedule.
1.2 CRA Requirements
The Comprehensive Relicensing Agreement (CRA) filed with the FERC in 2006 included drafts of the
WQMP (Appendix F) and the FWQIP (Appendix Q. The original Water Quality Certifications (WQCs)
issued by North Carolina on November 14, 2008, and by South Carolina on February 12, 2015
(incorporated in the License as Appendices A and B, respectively) required compliance with the
following components of the CRA as a condition of certification: the Water Quality Agreements in
Section 13 of the CRA; the WQMP; and the FWQIP. Regarding compliance with the WQCs and
acknowledging that physical modifications were necessary to meet the terms of the WQCs at some
developments, the CRA Water Quality Agreements stated the following:
Subsection 13.2
Following the implementation of all flow delivery and water quality enhancement modifications
as required by the FERC-approved Flow and Water Quality Implementation Plan (FWQIP), the
Licensee shall operate the Project developments for the term of the New License in accordance
with the States' 401 Water Quality Certifications.
Subsection 13.7 Interim Procedures of the CRA
The Parties acknowledge that the Licensee shall initiate interim changes to current operation at
selected Project developments that require physical equipment additions or modifications in
accordance with the FWQIP (Appendix L). The Licensee shall initiate the Interim Measures for
Providing Aquatic Flow and/or DO Enhancement until Physical Modifications are Complete as
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2022 Catawba-Wateree Hydroelectric Project Compliance Report
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identified in the FWQIP within 60 days following the issuance of the New License and closure of
all rehearing and administrative challenge periods related to water quantity, including Project
flow releases and reservoir levels, and water quality. The interim measures will continue at each
dam or powerhouse until completion of the necessary construction at that dam or powerhouse.
Unless the Licensee is operating in accordance with the Low Inflow Protocol and/or the
Maintenance and Emergency Protocol, the Licensee shall operate the hydro units at the
powerhouses identified for Interim Measures in Appendix L in the following manner:
When the Licensee is providing flow releases, reservoir level control, and/or generation with any
of these powerhouses at times that DO in the flow release from the powerhouse would be below
401 Water Quality Certification requirements, the Licensee shall operate the available hydro
units with the greatest existing DO enhancement capability at that powerhouse in a first -on, last -
off hierarchy and shall use all the DO enhancement capability available on all hydro units that
are operated at that powerhouse if needed in its best efforts to raise DO levels.
On May 5, 2017, Duke Energy filed with the FERC an Application for Amendment of License and
Submittal of the FWQIP and WQMP. The document included revised WQCs issued by the North Carolina
Department of Environmental Quality (NCDEQ) on February 27, 2017, and the South Carolina
Department of Health and Environmental Control (SCDHEC) on April 5, 2017. The revised WQCs
incorporated by reference the revised versions of the FWQIP and WQMP. The License Amendment,
revised FWQIP, and revised WQMP were approved by the FERC on January 22, 2018. The 2022 flow and
water quality monitoring data presented in this report were collected in accordance with the 2018
License Amendment, revised FWQIP, and revised WQMP.
1.3 Status of FWQIP Physical Modifications and WQMP Requirements
in 2022
FWQIP
Among those developments identified in the FWQIP as requiring physical modifications, all physical
modifications proposed to meet flow and/or DO requirements were completed at the Bridgewater,
Rhodhiss, Oxford and Wylie Developments prior to 2022. These developments were required to comply
with all License and WQC requirements in 2022.
At the Great Falls -Dearborn Development, construction continued in 2022 on the physical modifications
that will allow flow releases into the Long and Short Bypassed Reaches. Prior to construction, which
began in May 2021, the development was subject to compliance with the Interim Measures for
Providing Aquatic Flow specified in the FWQIP. Construction was completed in March 2023.
Physical modifications to provide aquatic flow and DO enhancement to Unit 5 at the Wateree
Development were completed in October 2022 with the operational performance testing completed on
November 2, 2022. Unit 5 was officially commissioned for generation and placed into service on January
4, 2023. The Wateree Development was therefore subject to compliance with the Interim Measures for
Providing Aquatic Flow and/or DO Enhancement in 2022. Full commissioning of Unit 5 will occur
following DO testing in the summer of 2023.
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2022 Catawba-Wateree Hydroelectric Project Compliance Report
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WQMP
The United States Geological Survey (USGS) completed installation of water quality monitoring stations
in Project tailraces in 2018. However, as noted in Table 3, Section 2.3 of the WQMP and in CRA Section
13.2, compliance with water quality standards is not required until the necessary Physical Modifications
for Providing Aquatic Flow and/or DO Enhancement specified in the FWQIP have been completed.
2 Development -Specific Article Requirements
Project Development License Article requirements applicable during 2022 are detailed for each Project
Development in this section of this report. Water quality requirements for each development (water
temperature and DO) follow applicable state surface water quality standards for freshwater.
Developments in North Carolina are required to meet standards developed by the NCDEQ (NCDEQ
2019). Developments in South Carolina follow standards developed by the SCDHEC (SCDHEC 2020).
2.1 Bridgewater Development
2.1.1 Elevation Article Requirements
There are two Reservoir Elevation requirements for Lake James: Reservoir Elevation limits, and the
Spring Reservoir Level Stabilization Program. The Normal Maximum Elevation compliance limit for Lake
James is 100.0 ft (local datum). The Normal Minimum Elevation compliance limit varies seasonally as
shown in Table 2-1.
Table 2-1. Bridgewater Development Normal Minimum Reservoir Elevations for Lake James.
Month Normal Minimum Elevation (ft)
Jan Interpolated daily, from 93.0 on Jan 1 to 92.0 on Feb 1
Feb -Mar 92.0
Apr Interpolated daily, from 92.0 ft on Apr 1 to 95.0 on May 1
May -Sep 95.0
Oct Interpolated daily, from 95.0 on Oct 1 to 93.0 on Nov 1
Nov -Dec 93.0
The Spring Reservoir Level Stabilization Program on Lake James began in the spring in response to four
consecutive days when lake temperatures were >_ 65 'F. The program requires lake levels to be
maintained within a range between 1.0 ft below and 2.0 ft above the lake level at the stabilization
program initiation. The stabilization program is required to last for three weeks after the program is
initiated.
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2.1.2 Flow Article Requirements
The Bridgewater Development is subject to compliance with three Flow Articles: Minimum Continuous
Flows at the tailrace and in the Catawba River Bypassed Reach, Recreational Flows, Flows Supporting
Public Water Supply, and Industrial Processes.
Minimum Continuous Flow compliance limits for the Bridgewater Tailrace varies seasonally, as shown in
Table 2-2.
Table 2-2. Bridgewater Development Tailrace Minimum Continuous Flow Release Requirements.
Month Minimum Continuous Flow (cfs)
Jan -Mar 145
Apr -Jul 95
Aug -Nov 75
Dec 145
Minimum Continuous Flow compliance limits for the Bridgewater Catawba River Bypassed Reach vary
seasonally as shown in Table 2-3.
Table 2-3. Bridgewater Development Catawba River Bypassed Reach Minimum Continuous Flow
Release Requirements.
Month Minimum Continuous Flow (cfs)
Jan -Jun 75
Jul -Nov 50
Dec 75
For the Recreational Flows Article, flows are required for float angling and paddling in accordance with
Table 2-4. Scheduled recreational flow release days are to be divided approximately equally between
flow releases to support float angling and paddling. The flows for float angling are to be as close as
feasible to 900 cfs, but shall not exceed 1,200 cfs, and the flows for paddling shall be at least 900 cfs.
Paragraph (F) of the Recreational Flows Article requires that up to 10 hours of additional recreational
flow be made available annually.
For the Flows Supporting Public Water Supply and Industrial Processes Article, at least 90 cfs Minimum
Continuous Flow is required for the City of Morganton's Catawba River Water Treatment Plant at River
264.
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Table 2-4. Bridgewater Development Recreational Flow Release Requirements.
Dates (inclusive)
Days / Description
Flow
Minimu(cfm
Hour Start
Hour End
Last full weekend —
Apr 1-Apr 30
Saturday and Sunday
900
10:00 AM
3:00 PM
Each Friday, Saturday,
and Sunday plus
May 1-Jul 15
Memorial and
900
10:00 AM
3:00 PM
Independence Day
Each Saturday and
Jul 16-Aug 31
Sunday
900
10:00 AM
3:00 PM
Wednesdays and
Jun 1-Jul 31
Thursdays
900
4:30 PM
6:30 PM
Each Friday, Saturday,
Sep 1-Sep 30
and Sunday plus Labor
900
10:00 AM
3:00 PM
Day
Each Saturday and
Oct 1-Oct 31
Sunday
900
10:00 AM
3:00 PM
2.1.3 Water Quality Article Requirements
The Bridgewater Development is subject to compliance with one Water Quality Article: Water Quality
Monitoring Plan. Sections 2.3 and 2.4 of the WQMP require DO and temperature monitoring at the
Bridgewater Development from April 1— November 30. Releases from the Bridgewater Development
are subject to compliance with North Carolina surface water DO and temperature standards for Class C
Mountain and Upper Piedmont waters. The North Carolina standards applicable to the Bridgewater
Development in 2022 are as follows:
North Carolina surface water DO standards:
Instantaneous DO: >_ 4.0 mg/L
Daily Average DO: >_ 5.0 mg/L
North Carolina surface water temperature standard:
Temperature: not to exceed 2.8 degrees C (5.04 degrees F) above the natural water temperature,
and in no case to exceed 29 degrees C (84.2 degrees F) for Mountain and Upper Piedmont
waters...
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2.2 Rhodhiss Development
2.2.1 Elevation Article Requirements
The Rhodhiss Development is subject to compliance with one Reservoir Elevation Article on Lake
Rhodhiss: Reservoir Elevations. Normal Minimum and Normal Maximum Elevation compliance limits for
Lake Rhodhiss are as follows:
Normal Minimum Elevation: 94.0 ft
Normal Maximum Elevation: 100.0 ft
2.2.2 Flow Article Requirements
The Rhodhiss Development is subjectto compliance with one Flow Article: Minimum Flows. The Minimum
Flows Article requires the Rhodhiss Development to release a Minimum Average Daily Flow (MADF) of
225 cfs. There is no Minimum Continuous Flow release requirement.
2.2.3 Water Quality Article Requirements
The Rhodhiss Development is subject to compliance with one Water Quality Article: Water Quality
Monitoring Plan. Sections 2.3 and 2.4 of the WQMP require DO and temperature monitoring at the
Rhodhiss Development from April 1— November 30. Releases from the Rhodhiss Development are
subject to compliance with North Carolina surface water DO and temperature standards for Class C
Mountain and upper Piedmont waters. The North Carolina standards applicable to the Rhodhiss
Development in 2022 are as follows:
North Carolina surface water DO standards:
Instantaneous DO: >_ 4.0 mg/L
Daily Average DO: >_ 5.0 mg/L
North Carolina surface water temperature standard:
Temperature: not to exceed 2.8 degrees C (5.04 degrees F) above the natural water temperature,
and in no case to exceed 29 degrees C (84.2 degrees F) for Mountain and upper Piedmont
waters...
2.3 Oxford Development
2.3.1 Elevation Article Requirements
The Oxford Development is subject to compliance with one Reservoir Elevation Article for Lake Hickory:
Reservoir Elevations. Normal Minimum and Normal Maximum Elevation compliance requirements for
Lake Hickory (Oxford Development) are as follows:
Normal Minimum Elevation: 94.0 ft
Normal Maximum Elevation: 100.0 ft
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2.3.2 Flow Article Requirements
The Oxford Development is subject to compliance with two Flow Articles: Recreational Flows, Minimum
Flows.
For the Recreational Flows Article, the Oxford Development is subject to release flows of at least 2,600
cfs from 10:00 to 15:00 on Saturdays and Sundays from May 1 through September 30, as well as on the
first four Saturdays in October, and Memorial, Independence, and Labor Days. Paragraph (F) of the
Recreational Flows Article requires up to 10 hours of additional recreational flow be made available
annually.
The Oxford Development is subject to release a Minimum Continuous Flow of 150 cfs, year-round, to
comply with the Minimum Flows Article.
2.3.3 Water Quality Article Requirements
The Oxford Development is subject to compliance with one Water Quality Article: Article — Water
Quality Monitoring Plan. Sections 2.3 and 2.4 of the WQMP require monitoring of DO and temperature
at the Oxford Development from April 1— November 30. The Oxford Development is subject to
compliance with North Carolina surface water DO and temperature standards for Class C Mountain and
upper Piedmont waters. The North Carolina standards applicable to the Oxford Development in 2022
are as follows:
North Carolina surface water DO standards:
Instantaneous DO: >_ 4.0 mg/L
Daily Average DO: >_ 5.0 mg/L
North Carolina surface water temperature standard:
Temperature: not to exceed 2.8 degrees C (5.04 degrees F) above the natural water temperature,
and in no case to exceed 29 degrees C (84.2 degrees F) for Mountain and upper Piedmont
waters...
2.4 Lookout Shoals Development
2.4.1 Elevation Article Requirements
The Lookout Shoals Development is subject to compliance with one Reservoir Elevation Article:
Reservoir Elevations. Normal Minimum and Normal Maximum Elevation compliance limits for Lookout
Shoals Lake are as follows:
Normal Minimum Elevation: 94.0 ft
Normal Maximum Elevation: 100.0 ft
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2.4.2 Flow Article Requirements
The Lookout Shoals Development is subject to compliance with one Flow Article: Minimum Flows. The
Lookout Shoals Development is subject to provide a year-round Minimum Continuous Flow release of 80
cfs.
2.4.3 Water Quality Article Requirements
The Lookout Shoals Development is subject to compliance with one Water Quality Article: Water Quality
Monitoring Plan. Sections 2.3 and 2.4 of the WQMP require monitoring of DO and temperature at the
Lookout Shoals Development from April 1— November 30. The Lookout Shoals Development is subject
to compliance with North Carolina surface water DO and temperature standards for Class C lower
Piedmont and Coastal Plain waters. The North Carolina standards applicable to the Lookout Shoals
Development in 2022 are as follows:
North Carolina surface water DO standards:
Instantaneous DO: >_ 4.0 mg/L
Daily Average DO: >_ 5.0 mg/L
North Carolina surface water temperature standard:
Temperature: not to exceed 2.8 degrees C (5.04 degrees F) above the natural water temperature,
and in no case to exceed 29 degrees C (84.2 degrees F) for lower Piedmont and Coastal Plain
waters...
2.5 Cowans Ford Development
2.5.1 Elevation Article Requirements
The Cowans Ford Development is subject to compliance with two Reservoir Elevation Articles: Reservoir
Elevations and Spring Reservoir Level Stabilization Program. The Normal Maximum Elevation compliance
limit for Lake Norman was 100.00 ft. Normal Minimum Elevation compliance limits varied seasonally as
shown on Table 2-5.
Table 2-5. Cowans Ford Normal Minimum Reservoir Elevations for Lake Norman.
Month Normal Minimum Elevation (ft)
Jan Interpolated daily, from 93.00 on Jan 1 to 91.00 on Feb 1
Feb Interpolated daily, from 91.00 on Feb 1 to 92.26 on Mar 1
Mar Interpolated daily, from 92.26 on Mar 1 to 93.65 on Apr 1
Apr Interpolated daily, from 93.65 on Apr 1 to 95.00 on May 1
May -Sep 95.00
Oct Interpolated daily, from 95.00 on Oct 1 to 93.98 on Nov 1
Nov Interpolated daily, from 93.98 on Nov 1 to 93.00 on Dec 1
Dec 93.00
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The Spring Reservoir Level Stabilization Program on Lake Norman began in the spring in response to four
consecutive days when lake temperatures were >_ 65 'F. The program requires lake levels to be
maintained within a range between 1.0 ft below and 2.0 ft above the lake level at the stabilization
program initiation. The stabilization program is required to last for three weeks after the program is
initiated.
2.5.2 Flow Article Requirements
The Cowans Ford Development is subject to compliance with one Flow Article: Minimum Flows. The
Cowans Ford Development is subject to provide a Minimum Average Daily Flow (MADF) release of 311
cfs. There is no Minimum Continuous Flow release requirement.
2.5.3 Water Quality Article Requirements
The Cowans Ford Development is subject to compliance with one Water Quality Article: Water Quality
Monitoring Plan. Sections 2.3 and 2.4 of the WQMP require monitoring of DO and temperature at the
Cowans Ford Development from April 1— November 30. Releases from the Cowans Ford Development
are subject to compliance with North Carolina surface water DO and temperature standards for Class C
lower Piedmont and Coastal Plain waters when the station is generating. The North Carolina standards
applicable to the Cowans Ford Development in 2022 are as follows:
North Carolina surface water DO standards:
Instantaneous DO: >_ 4.0 mg/L
Daily Average DO: >_ 5.0 mg/L
North Carolina surface water temperature standard:
Temperature: not to exceed 2.8 degrees C (5.04 degrees F) above the natural water temperature,
and in no case to exceed... 32 degrees C (89.6 degrees F) for lower Piedmont and Coastal Plain
waters.
2.6 Mountain Island Development
2.6.1 Elevation Article Requirements
The Mountain Island Development is subject to compliance with one Reservoir Elevation Article:
Reservoir Elevations. Normal Minimum and Normal Maximum Elevation compliance limits for Mountain
Island Lake were as follows:
Normal Minimum Elevation: 94.3 ft
Normal Maximum Elevation: 100.0 ft
2.6.2 Flow Article Requirements
The Mountain Island Development is subject to compliance with one Flow Article: Minimum Flows. The
Mountain Island Development is subject to provide a Minimum Average Daily Flow (MADF) release of
314 cfs. There is no Minimum Continuous Flow release requirement.
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2.6.3 Water Quality Article Requirements
The Mountain Island Development is subject to compliance with one Water Quality Article: Water
Quality Monitoring Plan. Sections 2.3 and 2.4 of the WQMP require monitoring of DO and temperature
at the Mountain Island Development from April 1— November 30. Releases from the Mountain Island
Development are subject to compliance with North Carolina surface water DO and temperature
standards for Class C lower Piedmont and Coastal Plain waters when the station is generating. The
North Carolina standards applicable to the Mountain Island Development in 2022 are as follows:
North Carolina surface water DO standards:
Instantaneous DO: >_ 4.0 mg/L
Daily Average DO: >_ 5.0 mg/L
North Carolina surface water temperature standard:
Temperature: not to exceed 2.8 degrees C (5.04 degrees F) above the natural water temperature,
and in no case to exceed... 32 degrees C (89.6 degrees F) for lower Piedmont and Coastal Plain
waters.
2.7 Wylie Development
2.7.1 Elevation Article Requirements
The Wylie Development is subject to compliance with two Reservoir Elevation Articles: Reservoir
Elevations, Spring Reservoir Level Stabilization Program. Normal Minimum and Maximum Elevation
compliance limits for Lake Wylie are as follows:
Normal Minimum Elevation: 94.0 ft
Normal Maximum Elevation: 100.0 ft
The Spring Reservoir Level Stabilization Program on Lake Wylie began in the spring in response to four
consecutive days when lake temperatures were >_ 65 'F. The program requires lake levels to be
maintained within a range between 1.0 ft below and 2.0 ft above the lake level at the stabilization
program initiation. The stabilization program is required to last for three weeks after the program is
initiated.
2.7.2 Flow Article Requirements
The Wylie Development is subject to compliance with four Flow Articles: Recreational Flows, Minimum
Flows, Wylie High Inflow Protocol, and Flows Supporting Public Water Supply and Industrial Processes.
Recreational flow requirements for the Wylie Development are set forth in accordance with Table 2-6.
In addition to these requirements, Paragraph (F) of the Recreational Flows Article requires up to an
additional 10 hours of recreational flow releases.
Pre -recreational flow compliance: The Wylie Development is subject to release flows of at least 1,300 cfs
for six hours prior to recreational releases scheduled May 1 through July 15 to ensure suitable water
levels at Landsford Canal State Park.
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The Wylie Development is subject to provide a year-round Minimum Continuous Flow of 1,100 cfs, apart
from times when the High Inflow Protocol is in effect. If the High Inflow Protocol is in effect, the Wylie
Development is required to provide a Minimum Continuous Flow of 1,300 cfs from February 15 through
May 15. The Wylie High Inflow Protocol is required to be met when the following conditions are met:
If the median flows for the three-month period from November 1 through January 31 for the
USGS streamflow gages on the Catawba River near Pleasant Gardens, NC (USGS #02137727), the
Johns River at Arney's Store, NC (USGS #02140991), and the South Fork Catawba River at Lowell,
NC (USGS#02145000) are all at or above 105 percent of the three-month (Nov -Jan) median flows
for the periods of record of those gages, then from February 15 through May 15, the Licensee
shall increase the Minimum Continuous Flow from the Wylie Development from 1,100 cfs to
1,300 cfs. If, when operating in the Wylie High Inflow Protocol, the February median flow for any
one of these three streamflow gages is below the February median flow for the period of record
of that gage, then the minimum flow requirement for the Wylie Development shall be reduced
on April 1 to 1,100 cfs.
The High Inflow Protocol was not in effect in 2022 from February 15 through May 15.
Table 2-6. Wylie Development Recreational Flow Release Requirements.
Dates (inclusive) Days / Description Minimum Flow Hour Start Hour End
(cfs)
Apr 1-Apr 30 Last full weekend — 3,000 10:00 AM 4:00 PM
Saturday and Sunday
Each Friday, Saturday,
May 1-Jun 15 and Sunday plus 3,000 10:00 AM 4:00 PM
Memorial Day
Each Saturday and
Jun 16-Jul 15 Sunday plus 3,000 10:00 AM 4:00 PM
Independence Day
Jul 16-Aug 31 Each Saturday and 3,000 10:00 AM 4:00 PM
Sunday
Each Friday, Saturday,
Sep 1-Sep 30 and Sunday plus Labor 3,000 10:00 AM 4:00 PM
Day
Oct 1-Oct 31 Each Saturday and 3,000 10:00 AM 4:00 PM
Sunday
The Wylie Development is subject to compliance with the Flows Supporting Public Water Supply and
Industrial Processes Article, Paragraph (A), Part 2, as follows:
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i. At River Mile 120, at least 600 cfs continuous minimum flow and approximately 1,000 cfs
for a continuous 16-hour period each day for the Bowater Pulp and Paper Mill'.
ii. At River Mile 122, up to an additional 71 cfs above existing flows in the river (as
measured at United Sates Geological Survey (USGS) Gage #02147000, Catawba River
near Catawba, SC) during periods of low river flow, the day after the Licensee receives a
request from the Union/Lancaster Catawba River Water Treatment Plant, to allow this
entity to operate within its permit (PERMIT NO. (P/N) 29 WS01 S02) issued by the South
Carolina Department of Health and Environmental Control.
iii. At USGS Gage #02146000 (Catawba River near Rock Hill, SC) (River Mile 137.6), at least
619 cfs weekly average flow to avoid pumping restrictions at Charlotte -Mecklenburg
Utilities' Mountain Island Development raw -water pumping facility imposed by
Condition (B) of the Commission's Order Approving Non -Project Use of Lands, February
23, 2004 (106 FERC 62,151) until such time that the Commission removes those
restrictions by a subsequent order.
iv. The above flow releases from the Wylie Development also meet the flow needs of the
Rock Hill (SC) Municipal back-up water supply intake (River Mile 137), Celanese Acetate's
intake (River Mile 136), and Nations Ford Chemical's intake (River Mile 135).
2.7.3 Water Quality Article Requirements
The Wylie Development is subject to compliance with one Water Quality Article: Water Quality
Monitoring Plan. Sections 2.3 and 2.4 of the WQMP require monitoring of DO and temperature at the
Wylie Development from April 1— November 30. Releases from the Wylie Development are subject to
compliance with South Carolina surface water DO and temperature standards. The South Carolina
standards applicable to the Wylie Development in 2022 are as follows:
South Carolina surface water DO standards:
Instantaneous DO: >_ 4.0 mg/L
Daily Average DO: >_ S.0 mg/L
South Carolina temperature standard:
The water temperature of all Freshwaters which are free flowing shall not be increased more
than 5oF [sic] (2.8°C) above natural temperature conditions and shall not exceed a maximum of
90°F (32.2°C) as a result of the discharge of heated liquids unless a different site -specific
temperature standard as provided for in C.12. has been established, a mixing zone as provided in
C.10. has been established, or a Section 316(a) determination under the Federal Clean Water Act
has been completed.
2.8 Fishing Creek Development
2.8.1 Elevation Article Requirements
The Fishing Creek Development is required to comply with one Reservoir Elevation Article: Reservoir
Elevations. Normal Minimum and Maximum Elevation compliance limits for Fishing Creek Reservoir are
as follows:
1 now New-Indy Catawba, LLC
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Normal Minimum Elevation: 95.0 ft
Normal Maximum Elevation: 100.0 ft
2.8.2 Flow Article Requirements
The Fishing Creek Development is subject to compliance with one Flow Article: Minimum Flows. The
Minimum Flows Article requires the Fishing Creek Development to release a Minimum Average Daily
Flow (MADF) of 440 cfs. There is no Minimum Continuous Flow release requirement.
2.8.3 Water Quality Article Requirements
The Fishing Creek Development is subject to compliance with one Water Quality Article: Water Quality
Monitoring Plan. Sections 2.3 and 2.4 of the WQMP require DO and temperature monitoring at the
Fishing Creek Development from April 1— November 30. Releases from the Fishing Creek Development
are subject to compliance with South Carolina surface water DO and temperature standards when the
station is generating. The South Carolina standards applicable to the Fishing Creek Development in 2022
are as follows:
South Carolina surface water DO standards:
Instantaneous DO: >_ 4.0 mg/L
Daily Average DO: >_ 5.0 mg/L
South Carolina temperature standard:
The water temperature of all Freshwaters which are free flowing shall not be increased more
than 5oF [sic] (2.8°C) above natural temperature conditions and shall not exceed a maximum of
90°F (32.2°C) as a result of the discharge of heated liquids unless a different site -specific
temperature standard as provided for in C.12. has been established, a mixing zone as provided in
C.10. has been established, or a Section 316(a) determination under the Federal Clean Water Act
has been completed.
2.9 Great Falls -Dearborn Development
2.9.1 Elevation Article Requirements
The Great Falls -Dearborn Development is subject to compliance with one Reservoir Elevation Article:
Reservoir Elevations. Normal Minimum and Maximum Elevation compliance limits for Great Falls
Reservoir are as follows:
Normal Minimum Elevation: 95.0 ft
Normal Maximum Elevation: 100.0 ft
2.9.2 Flow Article Requirements
The Great Falls and Dearborn Hydroelectric Stations were not subject to compliance with any Flow
Articles in 2022. However, Dearborn Hydro generation flow data were used in conjunction with
assessment of compliance with water quality standards in the Great Falls -Dearborn tailrace.
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Until structural modifications are complete, the Great Falls -Dearborn Development is required to
comply with the Interim Measures for Providing Aquatic Flow specified in the FWQIP, as follows:
In order to provide aquatic flow to the Short Bypass Duke Energy will leave open the existing
trash gate continuously with the exception of any time if and when it must be closed for public
safety, operational emergency, to perform design reconnaissance for the permanent headworks
modifications, or to begin constructing the permanent modifications.
2.9.3 Water Quality Article Requirements
The Great Falls -Dearborn Development is subject to compliance with one Water Quality Article: Water
Quality Monitoring Plan. Sections 2.3 and 2.4 of the WQMP require monitoring of DO and temperature
at the Great Falls -Dearborn Development from April 1— November 30. Releases from the Great Falls -
Dearborn Development are subject to compliance with South Carolina surface water DO and
temperature standards for freshwaters when the station is generating. The South Carolina standards
applicable to the Great Falls -Dearborn Development in 2022 are as follows:
South Carolina surface water DO standards:
Instantaneous DO: >_ 4.0 mg/L
Daily Average DO: >_ 5.0 mg/L
South Carolina temperature standard:
The water temperature of all Freshwaters which are free flowing shall not be increased more
than 5oF [sic] (2.8°C) above natural temperature conditions and shall not exceed a maximum of
90°F (32.2°C) as a result of the discharge of heated liquids unless a different site -specific
temperature standard as provided for in C.12. has been established, a mixing zone as provided in
C.10. has been established, or a Section 316(a) determination under the Federal Clean Water Act
has been completed.
2.10 Rocky Creek -Cedar Creek Development
2.10.1 Elevation Article Requirements
The Rocky Creek -Cedar Creek Development is subject to compliance with one Reservoir Elevation
Article: Reservoir Elevations. Normal Minimum and Maximum Elevation compliance limits for Cedar
Creek Reservoir are as follows:
Normal Minimum Elevation: 96.0 ft
Normal Maximum Elevation: 100.0 ft
2.10.2 Flow Article Requirements
The Rocky Creek -Cedar Creek Development is subject to compliance with one Flow Article: Minimum
Flows. The Rocky Creek -Cedar Creek Development is required to release a Minimum Average Daily Flow
of 445 cfs. There is no requirement to release a Continuous Minimum Flow. All eight units at the Rocky
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Creek Hydro Station have been decommissioned, therefore all flows released from the Rocky Creek -
Cedar Creek Development were provided via Cedar Creek operation.
2.10.3 Water Quality Article Requirements
The Rocky Creek -Cedar Creek Development was subject to compliance with one Water Quality Article:
Water Quality Monitoring Plan. Sections 2.3 and 2.4 of the WQMP require monitoring of DO and
temperature at the Rocky Creek -Cedar Creek Development from April 1— November 30. Releases from
the Rocky Creek -Cedar Creek Development are subject to compliance with SCDHEC surface water DO
and temperature standards for freshwaters when the station is generating. The South Carolina
standards applicable to the Rocky Creek -Cedar Creek Development in 2022 are as follows:
South Carolina surface water DO standards:
Instantaneous DO: >_ 4.0 mg/L
Daily Average DO: >_ 5.0 mg/L
South Carolina temperature standard:
The water temperature of all Freshwaters which are free flowing shall not be increased more
than SoF [sic] (2.8°C) above natural temperature conditions and shall not exceed a maximum of
90°F (32.2°C) as a result of the discharge of heated liquids unless a different site -specific
temperature standard as provided for in C.12. has been established, a mixing zone as provided in
C.10. has been established, or a Section 316(a) determination under the Federal Clean Water Act
has been completed.
2.11 Wateree Development
2.11.1 Elevation Article Requirements
The Wateree Development is subject to compliance with two Reservoir Elevation Articles: Reservoir
Elevations, and Spring Reservoir Level Stabilization Program. The Normal Maximum Elevation
compliance limit for Lake Wateree was 100.0 ft. Normal Minimum Elevation compliance limits vary
seasonally as shown on Table 2-7.
Table 2-7. Wateree Development Normal Minimum Reservoir Elevations for Lake Wateree.
Month Normal Minimum Elevation, ft
Jan 93.0
Feb Interpolated daily, from 93.0 ft on Feb 1 to 94.0 ft on Mar 1
Mar -Sep 94.0
Oct Interpolated daily, from 94.0 ft on Oct 1 to 93.0 ft on May 1
Nov -Dec 93.00
The Spring Reservoir Level Stabilization Program on Lake Wateree began in the spring in response to
four consecutive days when lake temperatures were >_ 65 'F. The program requires lake levels to be
maintained within a range between 1.0 ft below and 2.0 ft above the lake level at the stabilization
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program initiation. The stabilization program is required to last for three weeks after the program is
initiated.
2.11.2 Flow Article Requirements
The Wateree Development is subject to compliance with two Flow Articles: Recreational Flows and
Flows Supporting Public Water Supply and Industrial Processes. In 2023, the Wateree Development will
also be required to comply with the Minimum Continuous Flows Article following official commissioning
of Unit 5 for generation on January 4, 2023. Because commissioning of Unit 5 for generation was not
completed in 2022, the Wateree Development is required to comply with the Interim Measures for
Providing Aquatic Flow specified in the FWQIP as follows:
...approximate minimum continuous flows by (1) pulsing an existing unit 1 hr on, 2 hrs off from
May 16 thru Feb 14 during periods when at least 1 unit is not running continuously and (2)
running an existing hydro unit continuously from Feb 15 thru May 15.
For the purpose of assessing compliance with the generation patterns mandated by the Interim
Measures, the Wateree Development is defined as generating when discharge flows equal or exceed
500 cfs.
The Wateree Development is subject to release flows required by the Flows Supporting Public Water
Supply and Industrial Processes Article as follows:
At least 800 cfs continuous minimum flow at River Mile 12 for the South Carolina Electric & Gas
Company's [now Dominion Energy South Carolina] Wateree Steam Station and also for the
International Paper facility at River Mile 17.
The Recreational Flows Article requires the Wateree Development to release recreational flows of at
least 2,760 cfs from 10:00 to 15:00 on scheduled recreational release dates, April through July, and
September through October. Paragraph (F) of the Recreational Flows Article requires up to 10 hours of
additional recreational flow to be made available annually.
2.11.3 Water Quality Article Requirements
The FWQIP requires the replacement of one existing hydro unit with a smaller unit with aerating
capability (Physical Modifications Proposed to Meet Flow and/or DO Requirements at the Wateree
Development). This physical modification to Unit 5 was completed in October 2022 with DO testing
planned for the summer of 2023. Therefore, the Wateree Development was not required to comply with
SCDHEC water quality standards in the Wateree Tailrace during the water quality monitoring season of
2022, as stated in Table 3 of Section 2.3 of the WQMP:
At several locations, the installation of water quality monitors will precede the installation of the
equipment modifications necessary to achieve compliance. In these cases, the monitors will
assist Duke Energy in the implementation of interim measures per the FWQIP. However, these
monitor results are not suitable for compliance assessments until the necessary equipment
modifications have been implemented (refer to CRA Section 13.2).
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2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
The FWQIP requires an interim measure for operations until the aerating unit installation is completed:
When DO is below state standards, operate existing units with auto -venting capability (Units 1
and 3) on a first -on, last -off hierarchy whenever the station is being operated for flow release,
reservoir level control or generation.
24

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
3 Methods
3.1 Reservoir Elevation Article Compliance Assessment
Duke Energy records reservoir surface elevations hourly at all Catawba-Wateree Project Developments.
Reservoir elevations are expressed in feet, relative to a full pond elevation defined for each reservoir as
100 ft (local datum). Reservoir surface elevations and interpolated daily Normal Minimum Elevation
compliance limits are rounded to the nearest 0.1 ft prior to assessing compliance, except for the Cowans
Ford Development (Lake Norman), where observed elevations and interpolated Normal Minimum
Elevation compliance limits are rounded to the nearest 0.01 ft to allow for consistency with compliance
elevations listed for Lake Norman in the License.
Lake elevation data are presented graphically by development for visual comparison against specific
Reservoir Elevation Article requirements. A summary of the 2022 Reservoir Elevation Article deviations
previously communicated to the FERC for the Catawba-Wateree Project Developments are listed in
Table 4-1. If any deviations from Reservoir Elevation Articles in 2022 were not previously reported to the
FERC, then a brief summary of the deviation can be found in the development -specific Reservoir
Elevation Article results section (Section 4). Hourly elevation data for each development are provided in
a Microsoft Excel spreadsheet as Appendix A-1 to this report.
3.2 Flow Article Compliance Assessment
Two sources of flow data are utilized to assess compliance with the Flow Articles: flows recorded at
USGS Gaging Stations located in the development tailraces or downstream, and development flow
releases calculated by Duke Energy based on generation, and leakage data.
Flow data are expressed as cubic feet per second (cfs). Flow data are rounded to the nearest 1 cfs for
purposes of reporting and assessing compliance. All USGS flow data used in compliance assessment are
classified by the USGS as 'Approved' or 'Approved: estimated'. All flow data calculated by Duke Energy
from generation and leakage data are reported from an internal Duke Energy automated software
system and validated prior to analysis.
The Licensee complied with Paragraph (H) of the Recreational Flows Article by holding the Catawba-
Wateree Annual Recreational Flow Schedule Planning Meeting on March 9, 2022. The Summary of the
meeting was communicated to the FERC on April 4, 2022. The specific recreational flow release schedule
set forth in the Summary of the Annual Meeting constituted Recreational Flows Article compliance
requirements for 2022.
Flow data supporting Flow Article compliance determinations are presented graphically by development
for visual comparison against specific Flow Article compliance limits. A summary of the 2022 Flow
Article deviations previously communicated to the FERC for the Catawba-Wateree Project Developments
are listed in Table 4-2. If deviations from Flow Articles in 2022 were not previously reported to the
FERC, then a brief summary of the deviation can be found in the development -specific Flow Article
results section.
USGS data recorded in 15-minute increments from all gages as well as data from generation records is
provided in a Microsoft Excel spreadsheet as Appendix B-1 to the report. Summaries of the flow data as
25

2022 Catawba-Wateree Hydroelectric Project Compliance Report
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well as the compliance requirements are provided in another Microsoft Excel spreadsheet as Appendix
C-1 to this report.
3.3 Water Quality Compliance Assessment
Instantaneous water quality (temperature and DO) measurements are recorded at 15-minute intervals
from April 1 through November 30, 2022, at monitoring stations in each development tailrace or
downstream. These stations are installed, operated, and maintained by the USGS. Associated data are
reviewed for accuracy according to USGS Quality Assurance protocols. Data classified as "Approved" by
the USGS are used for assessment against applicable state water quality standards. The Wateree
Development is the exception as physical modifications, as required by the FWQIP, were not complete in
2022. Therefore, 2022 water quality data are not reported for the Wateree Development. In lieu of
compliance with water quality standards from April 1 through November 30, the Wateree Development
is subject to compliance with the Interim Measures for Providing DO Enhancement specified in the
FWQIP.
Water quality data are assessed at each development for deviations from state water quality standards.
At developments not required to release a Minimum Continuous Flow, only water quality values
recorded while the station was generating are assessed for deviations. Except for Wateree,
developments are defined as generating or releasing flow when flow was >_ 300 cfs. The Wateree
Development is defined as generating or releasing flow when flow was >_ 500 cfs.
Results of 2022 water quality compliance assessments are summarized for all the Catawba-Wateree
Project Developments in Table 4-3. Specific deviations from Instantaneous and Daily Average DO
standards are discussed in the development -specific Water Quality Article results section.
Compliance with water quality standards, and/or with Interim Measures for DO Enhancement where
applicable, is assessed for individual developments in the Water Quality Article results section, including
documentation of deviations from water quality standards and interim measures. Water quality data
recorded at 15-minute intervals are provided in a Microsoft Excel spreadsheet as Appendix D-1 to this
report.
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2022 Catawba-Wateree Hydroelectric Project Compliance Report
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4 Results and Discussion
4.1 Elevation Article Compliance
The FERC was notified of deviations from Reservoir Elevation Article compliance throughout the year for
each of the developments. Table 4-1 summarizes 2022 Reservoir Elevation Article deviations for all
developments including dates the deviations were communicated to the FERC.
Reservoir elevation data related to Reservoir Elevation Article compliance are presented graphically by
development for visual comparison against Reservoir Elevation Article requirements. Specific numeric
compliance limits are indicated in the Development -specific Article Requirement section of this report.
Table 4-1. Summary of Reservoir Elevation Article Deviations in 2022 and Dates of FERC Notification.
Notification
Date
Development Summary of Notification
FERC Order Granting Temporary Variance of
3/15/2021
Rhodhiss Reservoir Elevation and Minimum Average Daily
Flow Requirement to support Trash Rack Stop Log
(TRSL) replacement on Unit 2.
FERC-approved Reservoir Level Deviation for
8/10/2021
Great Falls/Dearborn construction of minimum flow and recreation flow
release structures required by the FWQIP.
1/4/2022 Rhodhiss Update on schedule for temporary license variance
and MEP Conditions A.1 and B.1 for TRSL Project.
2/7/2022 Rhodhiss Notification of Reservoir level deviation on 2/4 and
2/5/2022 due to rainfall event.
3/28/2022 Rhodhiss Notification of Reservoir level deviation on 3/21 and
3/22/2022 due to rainfall event.
5/2/2022 Rhodhiss Notification of completion of TRSL work on Unit 2
and end of approved license variance.
Notification of Reservoir Level Deviations at the
11/17/2022 Rhodhiss, Lookout Shoals Rhodhiss and Lookout Shoals Developments due to
high inflow event Nov 10-12.
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2022 Catawba-Wateree Hydroelectric Project Compliance Report
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4.1.1 Bridgewater Development
Lake James hourly surface elevations for January 1-December 31, 2022 are summarized in Figure 4-1.
There were no deviations from Reservoir Elevation Articles at the Bridgewater Development in 2022.
i[111►A
— 100
E
98
U
q� 96
0 94
c�
a�
may%
90 +
Jan
Lake James Hourly Lake Elevation
,—Spring Reservoir Level Stabilization Program:
May 3 - May 23
-----------------
L..—..—..—..—..—..—..—..—..
t �
Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Lake Elevation — �­ Normal Minimum --- Normal Maximum
Figure 4-1. Bridgewater Development: Lake James Hourly Surface Elevations, January 1-December 31,
2022.
28

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.1.2 Rhodhiss Development
Lake Rhodhiss hourly surface elevations for January 1-December 31, 2022 are summarized in Figure 4-2.
Reservoir Elevation Article deviations for the Rhodhiss Development are listed in Table 4-1. Duke
Energy notified FERC of the need for a license variance during the construction of the Trash Rack Stop
Log (TRSL) replacement project and FERC approved the variance on March 15, 2021 (Table 4-1). Duke
Energy explained that during construction, at times all three generating units would be out of service,
and this would result in the reservoir regularly exceeding its normal maximum elevation. Construction
on Unit 2 of the TRSL project began in October of 2021 and concluded on April 22, 2022 (Table 4-1,
5/2/2022). The deviations above the normal maximum elevation shown in Figure 4-2 below are
associated with the TRSL construction project, with the exception of the deviations on February 4 and 5,
March 21 and 22, and November 10-12, 2022. These deviations were due to high inflow and were
reported to FERC on February 7, March 28, and November 17, respectively (see Table 4-1).
104
102
E
c�
100
U
O
aD 98
a�
c
96
c�
a�
uJ 94
92 +
Jan
Lake Rhodhiss Hourly Lake Elevation
Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Lake Elevation Normal Minimum — Normal Maximum
Figure 4-2. Rhodhiss Development: Lake Rhodhiss Hourly Surface Elevations, January 1-December 31,
2022.
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2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.1.3 Oxford Development
Lake Hickory (Oxford Development) hourly surface elevations for January 1-December 31, 2022 are
summarized in Figure 4-3. There were no deviations from Reservoir Elevation Articles at the Oxford
Development in 2022.
Lake Hickory Hourly Lake Elevation
101
100t — — — — — — — — — — — — —
99
98
U
O
97
a�
c 96
0
M
> 95
u1
94 — — — — — — — — — — — — — — — — — — — — — —
93
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Lake Elevation Normal Minimum — Normal Maximum
Figure 4-3. Oxford Development: Lake Hickory Hourly Surface Elevations, January 1-December 31,
2022.
30

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.1.4 Lookout Shoals Development
Lookout Shoals Lake hourly surface elevations for January 1-December 31, 2022 are summarized in
Figure 4-4. Reservoir Elevation Article deviations for the Lookout Shoals Development are listed in Table
4-1. The deviation above the normal maximum elevation on June 7, 2022 was a result of a bus
disconnect inspection requiring a station outage. The lake level was raised to spill the minimum flow.
Also, the August 17, 2022 deviation occurred to meet the minimum continuous flow requirement during
a short station outage for battery replacement. These deviations were less than 24 hours in duration
and are defined as Incidental Maintenance per the Maintenance and Emergency Protocol (MEP) and do
not require a notification to FERC. The deviation above the normal maximum elevation during
November 10-12, 2022 was due to high inflow and was reported to FERC on November 17 (see Table 4-
1).
102
E 100
92 --!-
Jan
Lookout Shoals Hourly Lake Elevation
Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Lake Elevation Normal Minimum — Normal Maximum
Figure 4-4. Lookout Shoals Development: Lookout Shoals Lake Hourly Surface Elevations, January 1-
December 31, 2022.
31

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.1.5 Cowans Ford Development
Lake Norman (Cowans Ford Development) hourly surface elevations for January 1-December 31, 2022
are summarized in Figure 4-5. There were no deviations from Reservoir Elevation Articles at the Cowans
Ford Development in 2022.
102
100
E
98
U
a
96
w
94
Lake Norman Hourly Lake Elevation
Spring Reservoir Level Stabilization Program:
April 27 - May 17
---------
90
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Lake Elevation — — Normal Minimum --- Normal Maximum
Figure 4-5. Cowans Ford Development: Lake Norman Hourly Surface Elevations, January 1-December
31, 2022.
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2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.1.6 Mountain Island Development
Mountain Island Lake hourly surface elevations for January 1-December 31, 2022 are summarized in
Figure 4-6. The reservoir level deviation that occurred on December 23, 2022 was less than 24 hours in
duration and was necessary to support high energy demand due to the extremely cold weather.
101
100
99
6 98
a�
'-- 97
c
0
� 96
a�
W
95
94 -�-
Jan
Mountain Island Lake Hourly Lake Elevation
Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Lake Elevation Normal Minimum — Normal Maximum
Figure 4-6. Mountain Island Development: Mountain Island Lake Hourly Surface Elevations, January 1-
December 31, 2022.
33

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.1.7 Wylie Development
Lake Wylie hourly surface elevations for January 1-December 31, 2022 are summarized in Figure 4-7.
There were no deviations from Reservoir Elevation Articles at the Wylie Development in 2022.
101
100
E
Z3 99
c�
98
U
q) 97
as
c 96
0
a)95
W
94
93
Lake Wylie Hourly Lake Elevation
Spring Reservoir Level Stabilization Program:
April 27 - May 17
li L_J
I j
I �
_.._..—..—.._.._.._ l ._.._. .
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Lake Elevation — — Normal Minimum --- Normal Maximum
Figure 4-7. Wylie Development: Lake Wylie Hourly Surface Elevations, January 1-December 31, 2022.
34

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.1.8 Fishing Creek Development
Fishing Creek Reservoir hourly surface elevations for January 1-December 31, 2022 are summarized in
Figure 4-8. There were no deviations from Reservoir Elevation Articles at the Fishing Creek Development
in 2022.
101
100
E
99
0
6 98
m
'-- 97
c
0
� 96
a�
W
95
94 +
Jan
Fishing Creek Reservoir Hourly Lake Elevation
Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Lake Elevation Normal Minimum — Normal Maximum
Figure 4-8. Fishing Creek Development: Fishing Creek Reservoir Hourly Surface Elevations, January 1-
December 31, 2022.
35

2022 Catawba-Wateree Hydroelectric Project Compliance Report
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4.1.9 Great Falls -Dearborn Development
Great Falls Reservoir hourly surface elevations for January 1-December 31, 2022 are summarized in
Figure 4-9. FERC approved the License variance for Great Falls Reservoir Elevation deviations at the
Great Falls -Dearborn Development on August 10, 2021 (see Table 4-1). Construction of the flow release
structures on the long and short bypass continued throughout 2022.
Great Falls Reservoir Hourly Elevation
102
100— — — — — — — — — — — — —
E 98
c�
96
U
— — — — — — — — — —
0 94
a�
92
c
90
c�
W 88 I I
86
84
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Lake Elevation Normal Minimum — Normal Maximum
Figure 4-9. Great Falls -Dearborn Development: Great Falls Reservoir Hourly Surface Elevations,
January 1-December 31, 2022.
36

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.1.10 Rocky Creek -Cedar Creek Development
Cedar Creek Reservoir hourly surface elevations for January 1-December 31, 2022 are summarized in
Figure 4-10. The reservoir level deviation occurring on December 23, 2022 was less than 24 hours in
duration and was necessary to support high energy demand due to the extremely cold weather (MEP
incidental maintenance).
Cedar Creek Reservoir Hourly Elevation
101
— 100
E
c�
99
U
O
98
c
97
cU
aD
95
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Lake Elevation Normal Minimum — Normal Maximum
Figure 4-10. Rocky Creek -Cedar Creek Development: Cedar Creek Reservoir Hourly Surface Elevations,
January 1-December 31, 2022.
37

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.1.11 Wateree Development
Lake Wateree hourly surface elevations for January 1-December 31, 2022 are summarized in Figure 4-
11. There were no deviations from Reservoir Elevation Articles at the Wateree Development in 2022.
Construction of the inflatable gate at the Wateree Spillway began in November 2022 (see Table 4-1).
Lake Wateree Hourly Lake Elevation
102
100
98
a
W
a)
96
a
m L94
LJ
92 +
Jan
Spring Reservoir Level Stabilization Program:
April 17 - May 7
— — — — — — — — — — — — — — — — — — — — — —
L J
�r Y
I �
—..—..� L..—..—..—..—..—..—..—..—..—..�.
Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Lake Elevation ­ ­ Normal Minimum --- Normal Maximum
Figure 4-11. Wateree Development: Lake Wateree Hourly Surface Elevations, January 1-December 31,
2022.
38

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.2 Flow Article Compliance
The FERC was notified when deviations from Flow Article requirements occurred throughout the year
for each of the developments. Table 4-2 summarizes 2022 Flow Article deviations including dates of
FERC notification.
Flow data and compliance limits are presented graphically by development. Specific numeric
compliance limits are indicated in the Development -Specific Article Requirement section (Section 2) of
this report.
Table 4-2. Summary of Flow Article Deviations in 2022 and Dates of FERC Notification.
Notification Development Summary of Notification
Date
FERC approval of a license variance for a Weekly Average
3/15/2021 Rhodhiss Flow Release requirement January —April to replace
Minimum Average Daily Flow release requirement.
5/25/2022
Wylie
Recreation flow deviation on 5/22/2022 for one 15-minute
period.
Recreation flow deviation on 5/28 and 5/30 due to high
6/1/2022
Bridgewater
inflow event. Recreation flow deviation on 5/29 due to river
rescue.
Minimum flow and recreation flow deviation on 6/3/2022
6/7/2022
Wylie
due to Unit 4 trip (minimum flow unit) and Unit 1 trip
(recreation flow).
6/28/2022
Bridgewater
Delayed recreation flow release on 6/24/2022.
8/22/2022
Bridgewater
Notification of annual inspection of the Catawba Bypass Ring
Jet Valve to occur between December and March.
9/13/2022
Bridgewater
Recreation flow deviation on 9/9/2022 due to high inflow
forecast on 9/10-9/12/2022.
10/17/2022
Bridgewater
Recreation flow deviation due to river rescue on 10/15/2022.
12/1/2022 Bridgewater Minimum continuous flow deviation measured at the
Catawba Bypass on USGS gage No. 02138816.
12/16/2022 Bridgewater Minimum continuous flow deviations between 12/1 and 12/5
and inspection of the ring get valve on 12/5 and 12/6/2022.
39

2022 Catawba-Wateree Hydroelectric Project Compliance Report
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4.2.1 Bridgewater Development
Bridgewater Development continuous flows are provided in Figures 4-12 through 4-14. There were no
deviations from Minimum Continuous Flow release requirements at the Bridgewater Hydroelectric
Station Tailrace in 2022. Minimum Continuous Flow deviations for the Catawba River Bypassed Reach
were reported to FERC and are listed in Table 4-2.
10000
1000
4-
U
O
IL 100
10
1 /1 /22
Bridgewater 2022 Continuous Flows
3/1/22 5/1/22 7/1/22 9/1/22 11/1/22 1/1/23
Actual Flow Minimum Continuous Flow Requirement
Figure 4-12. Bridgewater Development: Flows measured in the Bridgewater Hydroelectric Station
Tailrace at USGS Gaging Station 02138520, January 1-December 31, 2022.
140
120
100
80
6 60
ILL
40
20
04--
1/1/22
Catawba River Bypassed Reach 2022 Flows
3/1/22 5/1/22 7/1/22 9/1/22 11/1/22 1/1/23
Actual Flow Minimum Continuous Flow Requirement
Figure 4-13. Bridgewater Development: Flows measured in the Bridgewater Catawba River Bypassed
Reach at USGS Gaging Station 02138816, January 1-December 31, 2022.
40

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
140
120
100
80
p 60
ILL
40
20
0
Catawba River Bypassed Reach December 2022 Flows
12/4/22 12/11 /22 12/18/22 12/25/22 1 /1 /23
Actual Flow Minimum Continous Flow Requirement
Figure 4-14. Bridgewater Development: The figure above is excerpted from Figure 4-13 for closer
examination.
Bridgewater Development continuous flows for Supporting Public Water Supply and Industrial Processes
are provided in Figure 4-15. There were no deviations from Flows for Supporting Public Water Supply
and Industrial Processes at the Bridgewater Development in 2022.
5 1000
45
U
u_ 100
10 4--
1 /1 /22
Flows Supporting Public Water Supply and Industrial Processes
3/1/22 5/1/22 7/1/22 9/1/22 11/1/22
Actual Flow Minimum Flow Requirement
1 /1 /23
Figure 4-15. Bridgewater Development: Total flow released from the Bridgewater Development (sum
of Bridgewater Hydro Tailrace and Catawba River Bypassed Reach flows), January 1-December 31,
2022, to support Public Water Supply and Industrial Processes Article.
41

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Recreation angling flow deviations reported to FERC are listed in Table 4-2. Replacement flow for May
28 and May 30 angling flows were made up on June 9 and June 15, 2022. Replacement flow for
September 9 angling flow was made up on October 7, 2022. Additional time was added to the angling
flow period on October 15 after flow was lowered for a river rescue (Figure 4-16).
Bridgewater 2022 Recreation Angling Flows
3200
3100
3000
X
2900
2800
1800
X
40 1600
X
U
1400
1200
ILL1000
W X W XK Xt * *XN* X
XX X*XXWX XX X
X �#1t
600
400
200
X
0
4/1 /22
6/1 /22 8/1 /22
10/1 /22
X Actual Flow Minimum Flow Requirement Maximum Flow Requirement
Figure 4-16. Bridgewater Development: Recreational flows released for the purpose of float angling,
April -October 2022. Flows were measured at USGS Gaging Station 02138520.
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2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Recreation paddling flow deviations reported to FERC are documented in Table 4-2. Additional time was
added to the paddling flow period on May 29, 2022 after the flow was lowered for a river rescue.
(Figure 4-17).
Bridgewater 2022 Recreation Paddling Flows
3200
3100
x
3000
i
2000
1800 x x
1600
p 1400 ii ' x xk x x x �t �Ot x x
u_ 1200
1000 x x
800
600
400
200 x x
0
4/1 /22 6/1 /22 8/1 /22 10/1 /22
x Actual Flow Minimum Flow Requirement
Figure 4-17. Bridgewater Development: Recreational flows released for the purpose of paddling, April -
October 2022. Flows were measured at USGS Gaging Station 02138520.
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2022 Catawba-Wateree Hydroelectric Project Compliance Report
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Migratory bird hunting flows provided October 21-22 are summarized in Figure 4-18. These flows
demonstrate Bridgewater Development compliance with the Recreational Flows Article by providing up
to an additional 10 hours of recreational flow upon request.
Bridgewater 2022 Migratory Bird Hunting Flows
3000
2500
2000
U
1500
0
ILL
1000
500
0
10/21/22 0:00:00 10/21/22 12:00:00 10/22/22 0:00:00 10/22/22 12:00:00 10/23/22 0:00:00
Target Flow (not a compliance limit)
Figure 4-18. Bridgewater Development: Recreational flows released for the purpose of migratory bird
hunting, October 21-22, 2022. Flows were measured at USGS Gaging Station 02138520.
44

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.2.2 Rhodhiss Development
Average daily flow releases for the Rhodhiss Development are provided in Figure 4-19. A License
variance for deviation from the Minimum Average Daily Flow requirement occurring January — April
2022 was approved by FERC on March 15, 2021 (Table 4-2) allowing instead a Weekly Average Flow
Release requirement (Figure 4-20).
�;
IL
li111111111
1000
100
10 4--
1 /1 /22
Rhodhiss 2022 Average Daily Flows
3/1/22 5/1/22 7/1/22 9/1/22 11/1/22
Average Flow Minimum Average Daily Flow Requirement
Figure 4-19. Rhodhiss Development: Average daily flows released at the Rhodhiss Development
January 1-December 31, 2022.
LL
10000
1000
100
Rhodhiss 2022 Average Weekly Flows
x
x
x x x x x x x x x x x x x x
1/1/23
10 i I I 1 '
1 /1 /22 2/1 /22 3/1 /22 4/1 /22 5/1 /22
x Average Flow Minimum Average Weekly Flow Requirement
Figure 4-20. Rhodhiss Development: Average weekly flows released at the Rhodhiss Development
January 1-April 30, 2022.
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2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.2.3 Oxford Development
Continuous flows for the Oxford Development are provided in Figure 4-21. There were no deviations
from the Oxford Minimum Continuous Flow release requirements in 2022.
10000
w
1000
3
0
ILL
100
10 4--
1 /1 /22
Oxford 2022 Continuous Flows
3/1/22 5/1/22 7/1/22 9/1/22 11/1/22 1/1/23
Actual Flow Minimum Continuous Flow Requirement
Figure 4-21.Oxford Development: Flows measured at USGS Gaging Station 0214196125 in the Oxford
tailrace, January 1-December 31, 2022.
Recreational flows for the Oxford Development are provided in Figure 4-22. There were no deviations
from the Oxford recreational flow release requirements in 2022.
6000
5500
5000
4500
U
4000
3500
3000
2500
2000
5/1 /22
Oxford 2022 Recreational Flows
R
#N o %gooMXX
7/1 /22
9/1 /22
x Actual Flow Minimum Required Flow
11 /1 /22
Figure 4-22. Oxford Development: Recreational flows measured at USGS Gaging Station 0214196125
in the Oxford tailrace, May -October 2022.
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2022 Catawba-Wateree Hydroelectric Project Compliance Report
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4.2.4 Lookout Shoals Development
Lookout Shoals Development continuous flow releases are provided in Figure 4-23. There were no
deviations from the Minimum Continuous Flow Release requirement at the Lookout Shoals
Development in 2022.
�i
LL
10000
1000
100
10
1 /1 /22
Lookout Shoals 2022 Continuous Flows
3/1/22 5/1/22 7/1/22 9/1/22 11/1/22 1/1/23
Actual Flow Minimum Continuous Flow Requirement
Figure 4-23. Lookout Shoals Development: Flows measured at USGS Gaging Station 0214244102 in the
Lookout Shoals Tailrace, January 1-December 31, 2022.
47

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.2.5 Cowans Ford Development
Cowans Ford Development average daily flow releases are provided in Figure 4-24. There were no
deviations from the Cowans Ford Minimum Average Daily Flow release requirement in 2022.
Cowans Ford 2022 Average Daily Flows
10000
1000
0
ILL
100
10
1/1/22 3/1/22 5/1/22 7/1/22 9/1/22 11/1/22 1/1/23
Average Flow Minimum Average Daily Flow Requirement
Figure 4-24. Cowans Ford Development: Average daily flows released January 1-December 31, 2022.
Flows were calculated based on generation data.
48

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.2.6 Mountain Island Development
Mountain Island development average daily flow releases are provided in Figure 4-25. There were no
deviations from the Mountain Island Minimum Average Daily Flow release requirement in 2022.
Mountain Island 2022 Average Daily Flows
10000
a
1000
3
0
LL
100
10
1/1/22 3/1/22 5/1/22 7/1/22 9/1/22 11/1/22 1/1/23
Average Flow Minimum Average Daily Flow Requirement
Figure 4-25. Mountain Island Development: Average daily flows released January 1-December 31,
2022. Flows were calculated based on generation data.
49

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.2.7 Wylie Development
Wylie Development continuous flows are provided in Figure 4-26. There was one deviation from the
Wylie Minimum Continuous Flow release requirement in 2022 and this was reported to FERC on June 7,
2022 (see Table 4-2). Minimum continuous flow releases requirements were not increased from 1,100
cfs to 1,300 cfs from February 15 through May 15 due to the stream flow gages defined in Section 2.7.2
above did not meet the criteria necessary to trigger implementation of the High Inflow Protocol.
Wylie 2022 Continuous Flows
U
l1000
100
1/1/22 3/1/22 5/1/22 7/1/22 9/1/22 11/1/22 1/1/23
Actual Flow
Minimum Continuous Flow Requirement
Figure 4-26. Wylie Development: Wylie Tailrace flows recorded at USGS Gaging Station 02145910,
January 1-December 31, 2022.
50

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Wylie Development recreational flows from April 1 to October 31 are provided in Figure 4-27.
Recreation flow deviations reported to FERC are listed in Table 4-2.
5000
4500
4000
U
3500
_O
u_ 3000
2500
2000
4/1 /22
Wylie 2022 Recreational Flows
x
x X X<
uX X x
5/1/22 6/1/22 7/1/22 8/1/22 9/1/22 10/1/22
x Actual Flow Minimum Required Flow
11 /1 /22
Figure 4-27. Wylie Development: Recreational flows recorded at USGS Gaging Station 02145910,
located 0.5 miles downstream of Wylie, April -October 2022.
51

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Wylie Development flows supporting public water supply and industrial processes are summarized in
Figure 4-28. More specifically, the Wylie Development exceeded the Minimum Continuous Flow of 600
cfs as required for public water supply and industrial processes, meeting the 1,000 cfs continuous 16-
hour period each day for the New-Indy Catawba, LLC plant. There were no requests received from the
Union/Lancaster Catawba River Water Treatment Plant for the additional 71 cfs flow specified in the
License.
Wylie 2022 Flows Supporting Public Water Supply and Industrial Processes
10000
U
1000
100
1/1/22 3/1/22 5/1/22 7/1/22 9/1/22 11/1/22 1/1/23
Actual Flow - Minimum 16-Hr Flow Requirement Public and Industrial Process Flow Requirement
Figure 4-28. Wylie Development: Flows supporting public water supply and industrial processes
recorded at USGS Gaging Station 02147020, located 19 miles downstream of the Wylie Tailrace,
January -December 2022.
52

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Wylie Development weekly average flows supporting public water supply and industrial processes are
summarized in Figure 4-29. There were no deviations from weekly average flows supporting public
water supply and industrial processes recorded at USGS Gaging Station 02146000.
10000
3
1000
Wylie 2022 Weekly Average Flows
x
xxx
xx xxxxx xxxxxx xx x x xxxxxx>
xxx x x
xxxxxxxxxxxx x xxxxxx
100 -4--
1 /1 /22
3/1/22 5/1/22 7/1/22 9/1/22 11/1/22
x Average Flow Minimum Weekly Average Flow Requirement
1 /1 /23
Figure 4-29. Wylie Development: Weekly average flows supporting public water supply and industrial
processes recorded at USGS Gaging Station 02146000, located 3.5 miles downstream of the Wylie
Tailrace, January -December 2022.
53

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.2.8 Fishing Creek Development
Fishing Creek Development average daily flows are provided in Figure 4-30. There were no deviations
from the Fishing Creek Minimum Average Daily Flow release requirement.
Fishing Creek 2922 Average ❑aily Flows
10000
1000
ILL
100
10
111122 311122 511122 711122 911122 1111122 111123
Average Flow Minimum Average Daily Flow Requirement
Figure 4-30. Fishing Creek Development: Average daily flows released by the Fishing Creek
Development, January 1-December 31, 2022.
4.2.9 Great Falls -Dearborn Development
Construction began on the Long and Short Bypassed Reach flow release structures in May 2021 and
continued throughout 2022. The Great Falls and Dearborn Hydroelectric Stations were not subject to
compliance with any Flow Articles in the Long and Short Bypassed Reach in 2022. Post -construction flow
release data beginning in 2023 will be provided in the 2023 annual report.
54

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.2.10 Rocky Creek -Cedar Creek Development
Rocky Creek -Cedar Creek Development average daily flows are provided in Figure 4-31. There were no
deviations from the Rocky Creek -Cedar Creek Minimum Average Daily Flow release requirement in
2022.
IL
10000
1000
100
10 -4--
1 /1 /22
Rocky Creek -Cedar Creek 2022 Average Daily Flows
3/1/22 5/1/22 7/1/22 9/1/22 11/1/22
Average Flow Minimum Average Daily Flow Requirement
1 /1 /23
Figure 4-31. Rocky Creek -Cedar Creek Development: Average daily flows released January 1-December
31, 2022.
55

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.2.11 Wateree Development
Wateree Development FWQIP Interim Flow Measures for January 1 through May 15, 2022 are provided
in Figure 4-32. Deviations from the FWQIP Interim Flow Measures were documented on February 8 and
9, and March 2, 2022. These deviations were associated with installation, operation, and maintenance
of the License required Trap, Sort & Transport (TST) Facility downstream of the Wateree Development
and did not require notification to the FERC. The longest consecutive non -generation period of 7.5
hours occurred during annual TST Facility installation on February 8, 2022. All other non -generation
periods during deviations related to TST Facility operation and maintenance occurred for an hour, or
less. Replacement flow was provided on each of the deviation dates after the deviation occurred.
10000
1000
iia0
Wateree Flog Recorded January 1 -May 15, 2022
114/22 1l18l22 2 V22 21522 311122 3115l22 3129122 4i12)22 42CV22 5110122
Actual Flow 1-Unit 1`0inimum Flow (Operational Threshold:, Estimated Average 1-Unit Flow
Figure 4-32. Wateree Development: Wateree FWQIP Interim Flow Measures recorded at Wateree
Tailrace from January 1— February 14 and during required continuous 1-unit generation period
(February 15 — May 15).
56

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Wateree Development FWQIP Interim Flow Measures for May 16 to August 15, 2022 are provided in
Figure 4-33. A deviation from the FWQIP Interim Flow Measure documented on June 7 was associated
with the annual TST Facility shut down and removal and did not require communication to the FERC.
Replacement flow was provided after the deviation occurred.
10000
s
003
1[U
5117122
1D00D
1DD
:a'; ".""."a - e -e e Ic;, ,:�ecc.-ded [-.,Ia'r ; 6 - June ,U '2022,
As
(b)WAeree Flaw Recorded June 16-,July 15, =
_ - 75M
(c) Walleree RDw Recorded July 16-August 15, 2022
4'14=,
7.11 Drcc .2=
— Acual Row — 1-Ur itMnimum Raw {OperatianalThreshola} — Estimlea Y:;=_ a;=_ ' _ - ,
Figure 4-33. Wateree Development: Wateree FWQIP Interim Flow Measure recorded at Wateree
Tailrace from (a) May 16 — June 15, (b) June 16 — July 15, and (c) July 16 — August 15.
57

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Wateree Development FWQIP Interim Flow Measures from August 16 to November 15, 2022 are
provided in Figure 4-34.
10 000
100
10000
100
(a: '.:.,:'ateree Flo.,-,i Recorded August 16 - Se-�te Mver 1 ry 21-122
fbj Wateree Flow Recorded September 16 - O-cteber 16 = ---
5:20:2t 1D 422
(c) Wateree Flow Recorded October 16 - November 15 = _--
I€
10118.22 11.'Vcam 11r 15
kL e = — --Ur itMininornFlYav{OperatianalThNnho& — EstinatedAtieragel-UritF
Figure 4-34. Wateree Development: Wateree FWQIP Interim Flow Measure recorded at Wateree
Tailrace from (a) August 16 — September 15, (b) September 16 - October 15, (c) October 16 —
November 15.
m

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Wateree Development FWQIP Interim Flow Measures from November 16 to December 15, 2022 are
provided in Figure 4-35. There were no deviations from the FWQIP Interim Flow Measure during this
time.
10000
1000
100
Wateree Flow Recorded November 16 - December 31, 2022
11 r= 12f62 1212 0122
—Actual Flow— 1-UnitMinimum Flow (Operational ihre_-cld) Estimated Average 1-Unit Flc.
Figure 4-35. Wateree Development: Wateree FWQIP Interim Flow Measure recorded at Wateree
Tailrace from November 16 — December 31, 2022.
59

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Wateree Development recreational flow releases from April 1 to October 31 are provided in Figure 4-36
and Figure 4-37. There were no deviations from the Wateree recreation flow release requirements in
2022.
3200
3100
3000
3
0 2900
ILL
2800
2700
4/1 /22
Wateree 2022 Recreational Flows
5/1/22 6/1/22 7/1/22 8/1/22 9/1/22 10/1/22
x Actual Flow Minimum Required Flow
11 /1 /22
Figure 4-36. Wateree Development: Recreational flows released by the Wateree Development from
10:00 to 15:00 on recreational flow release dates, April -October 2022.
.(

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Instantaneous flows measured at USGS Gaging Station 02148000 from 12:30 to 17:30 are plotted in
Figure 4-37 alongside average flows for the same period. Flows presented allow two and a half hours
for recreational flows released at Wateree from 10:00 to 15:00 to be fully manifested 7.4 miles
downstream at the USGS Gaging Station 02148000. Average flows measured at the gaging station from
12:30 to 17:30 exceeded the compliance minimum recreational flow of 2,760 cfs on all but 11 dates:
June 11, 12, and 26, July 2, September 3, 4, 17, 24 and 25, and October 8 and 9. On these dates, average
flows were within 5 % of the required minimum recreational flow. Individual instantaneous flows
dropped below the minimum required flow on these, and other dates; however, as indicated in Figure 4-
36, the recreational minimum flow was met as measured by generation records from Wateree Hydro
Station.
9000
8000
7000
6000
5000
4000
3000
2000
1000
Wateree 2022 Recreational Flows at Camden
x
x
X X x
x
x
XX X X
x X XX X
x
4/1 /22 5/1 /22 6/1 /22 7/1 /22 8/1 /22 9/1 /22 10/1 /22 11 /1 /22
x Actual Flow Minimum Flow Requirement • Average Recreational Flow
Figure 4-37. Wateree Development: Flows measured at USGS Gaging Station 02148000 from 12:30-
17:30, allowing 2.5 hours for recreational flows released 10:00-15:00 at the Wateree Development to
be fully manifested 7.4 miles downstream at USGS Gaging Station 02148000.
61

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Wateree Development flows supporting public water supply and industrial processes are summarized in
Figure 4-38. Instantaneous flows dropped below the required minimum flows for supporting public
water supply and industrial processes at USGS Gaging Station 02148000 on June 7 related to the annual
TST Facility removal. USGS Gaging Station 0214800 is the closest active gaging station and is located 7.4
miles downstream of the Wateree Hydro Station. This is more than 50 miles upstream of River Mile 12
for the South Carolina Electric & Gas Company's [now Dominion Energy South Carolina] Wateree Steam
Station and for the International Paper facility (now Sylvamo North America, LLC) at River Mile 17.
Historically, a USGS gaging station (02148351) at Eastover, South Carolina recorded flows in the Wateree
River at River Mile 12 as specified in the License. This gaging station was retired in 2014. Flows at River
Mile 12 near the retired USGS Gaging Station 02148351 were estimated for this report using USGS
Gaging Station 0214800 flow data and drainage area ratio calculations outlined in Gianfagna et al, 2015.
There is a 10 % incremental increase in flow from the USGS Gaging Station at Camden, SC (0214800) to
the USGS Gaging Station 02148351 at Eastover, SC based on their drainage ratios. The minimum
estimated instantaneous flow for River Mile 12 in 2022 was 552 cfs on June 7 and was related to the
annual TST Facility removal. For all other days 878 cfs was the minimum estimated instantaneous flow.
Estimated minimum flow at River Mile 12 demonstrates Wateree River flows exceeded the minimum
required flows for supporting public water supply and industrial processes.
u_
Wateree 2022 Flows Supporting Public Water Supply and Industrial Processes
10000
1000
10
1/1/22 3/1/22 5/1/22 7/1/22 9/1/22 11/1/22 1/1/23
Actual Flow Minimum Required Flow
Figure 4-38. Wateree Development: Wateree Flows supporting public water supply and industrial
processes recorded at USGS Gaging Station 02148000, January 1-December 31, 2022.
62

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.3 Water Quality Article Compliance
This report serves as notification to the FERC of deviations from Water Quality Articles for 2022. Table
4-3 summarizes 2022 Water Quality Article deviations for all developments. Compliance with
instantaneous and daily average DO state standards were each achieved at 99.9 % for the Project.
Compliance with instantaneous state temperature standards was achieved at 99.9 % for the Project.
Table 4-3. Summary of All Water Quality Article Deviations in 2022.
Instantaneous DO Instantaneous
Development Deviations from State Daily DO Deviations Temperature
Standard from State Standards Deviations from State
Standard
Bridgewater
No deviations
No deviations
No deviations
Rhodhiss
No deviations
No deviations
No deviations
Oxford
8 (see text)
No deviations
2 (see text)
Lookout Shoals
No deviations
No deviations
No deviations
Cowans Ford
7 (see text)
1 (see text)
No deviations
Mountain Island
No deviations
No deviations
No deviations
Wylie
No deviations
No deviations
No deviations
Fishing Creek
3 (see text)
No deviations
No deviations
Great Falls/Dearborn
No deviations
No deviations
No deviations
Rocky Creek/Cedar
No deviations
No deviations
No deviations
Creek
Wateree
Not required
Not required
Not required
63

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Water quality data collected for Water Quality Article compliance are presented graphically via boxplots
by development. These plots are a tool to visualize distribution of large data sets. Plots include the
applicable state water quality standard, including instantaneous DO, daily average DO, and
instantaneous temperature, for comparison. Figure 4-39 is an example boxplot highlighting the
components of the boxplots presented in the following sections. Specific numeric water quality
standards applicable to each development are provided in the development -specific section of this
report.
Water Quality Article Compliance Example DO Format
14
12
WQ Standard
4
2
e �- Maximum Value
.� 95th Percentile
{f 75th Percentile
50th Percentile (median)
'~ 25th Percentile
5th Percentile
*--- Minimum Value
May
Figure 4-39. Example boxplot for representing water quality datasets in this report.
64

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.3.1 Bridgewater Development (Lake James)
Bridgewater Development instantaneous DO concentrations from April through November 2022 are
summarized by month in Figure 4-40. The Bridgewater Development met the North Carolina
instantaneous DO water quality standard for all readings in 2022.
Bridgewater Instantaneous Tailrace DO Summary by Month
12
10
J
0)
E
C 8
N
0)
X
0
6
0
r)
4
2
n
0
■
Apr May Jun Jul Aug Sep Oct Nov
State Instantaneous DO Standard
Figure 4-40. Bridgewater Development: Summary of instantaneous dissolved oxygen (DO)
concentrations recorded in the Bridgewater Tailrace at USGS Water Quality Monitoring Station
02138520, April 1-November 30, 2022.
65

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Bridgewater Development daily average DO concentrations from April through November 2022 are
summarized in Figure 4-41. The Bridgewater Development met the North Carolina daily average DO
water quality standard for all daily average DO values in 2022.
Bridgewater Daily Average Tailrace DO Summary by Month
12
10
�
5
4
Apr May Jun Jul Aug Sep Oct Nov
State Daily Average DO Standard
Figure 4-41. Bridgewater Development: Summary of daily average dissolved oxygen (DO)
concentrations recorded in the Bridgewater Tailrace at USGS Water Quality Monitoring Station
02138520, April 1-November 30, 2022.

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Bridgewater Development instantaneous tailrace temperatures from April through November 2022 are
summarized in Figure 4-42. The Bridgewater Development met the North Carolina instantaneous
temperature water quality standard for all readings in 2022.
Bridgewater Instantaneous Tailrace Temperature Summary by Month
G
a
30
25
IN
5
Apr May Jun Jul Aug Sep Oct Nov
State Instantaneous Temperature Standard
Figure 4-42. Bridgewater Development: Summary of instantaneous water temperature recorded in
the Bridgewater Tailrace at USGS Water Quality Monitoring Station 02138520, April 1-November 30,
2022.
67

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.3.2 Rhodhiss Development
Rhodhiss Development instantaneous DO concentrations from April through November 2022 are
summarized in Figure 4-43. The Rhodhiss Development met the North Carolina instantaneous DO water
quality standard for all readings in 2022.
Rhodhiss Instantaneous Tailrace DO Summary by Month
14
12
J
0)
E 10
C
a)
O $
N
o g
En
rid
4
2
0
0
Apr May Jun Jul Aug Sep Oct Nov
State Instantaneous DO Standard
Figure 4-43. Rhodhiss Development: Summary of instantaneous dissolved oxygen (DO) concentrations
recorded in the Rhodhiss Tailrace at USGS Water Quality Monitoring Station 02141500 while Rhodhiss
Hydro Station was generating, April 1-November 30, 2022.

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Rhodhiss Development daily average DO concentrations from April through November 2022 are
summarized in Figure 4-44. The Rhodhiss Development met the North Carolina daily average DO water
quality standard for all daily average DO values in 2022.
12
10
J
E
C 8
W
X
0
a) 6
0
U)
U)
0
4
2
Rhodhiss Daily Average Tailrace DO Summary By Month
n
0
13
13
TE 13
Apr May Jun Jul Aug Sep Oct Nov
State Daily Average DO Standard
Figure 4-44. Rhodhiss Development: Summary of daily averages of dissolved oxygen (DO)
concentrations recorded in the Rhodhiss Tailrace while Rhodhiss Hydro Station was generating, April
1-November 30, 2022.
.•

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Rhodhiss Development Tailrace instantaneous temperatures from April through November 2022 are
summarized in Figure 4-45. The Rhodhiss Development met the North Carolina instantaneous
temperature water quality standard for all readings in 2022.
Rhodhiss Instantaneous Tailrace Temperature Summary by Month
35
30
& 25
0
L
20
N
Q
H 15
10
5
0 0
o
0
0
o
o ■
■ o
Apr May Jun Jul Aug Sep Oct Nov
State Instantaneous Temperature Standard
Figure 4-45. Rhodhiss Development: Summary of instantaneous temperatures recorded in the
Rhodhiss Tailrace at USGS Water Quality Monitoring Station 02141500 while Rhodhiss Hydro Station
was generating, April 1-November 30, 2022.
70

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.3.3 Oxford Development (Lake Hickory)
Oxford Development instantaneous DO concentrations from April through November 2022 are
summarized in Figure 4-46. The Oxford Development met the North Carolina water quality standard for
instantaneous DO in 2022 for all except eight readings on August 16, 2022. DO concentrations dropped
to 3.8 mg/L on August 16 due to an unexpected mixing event on Lake Hickory following abnormally cool
weather (Figure 4-47). DO concentrations were raised above 4.0 mg/L within 2 hours with additional
aeration at the Oxford Development.
Oxford Instantaneous Tailrace DO Summary by Month
14
12 0
J
E 10
a)
0)
0 8
(D
0 6
U)
U)
1W
4
2
0
13
13
13
13
Apr May Jun Jul Aug Sep Oct Nov
State Instantaneous DO Standard
Figure 4-46. Oxford Development: Summary of instantaneous dissolved oxygen (DO) concentrations
recorded in the Oxford Tailrace at USGS Water Quality Monitoring Station 0214196125, April 1-
November 30, 2022.
71

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
item
J
� 8
F
X 6
O
m
U) 4
U)
11W
2
Oxford August Instantaneous DO Data
8/7/1922 8/14/1922 8/21/1922 8/28/1922
Instantaneous DO State Instantaneous DO Standard
Figure 4-47. Oxford Development: Instantaneous dissolved oxygen (DO) concentrations recorded in
the Oxford Tailrace at USGS Water Quality Monitoring Station 0214196125, August 1-August 31, 2022
a showing brief instantaneous exceedance on August 16, 2022.
72

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Oxford Development daily average DO concentrations from April through November 2022 are
summarized in Figure 4-48. The Oxford Development met the North Carolina daily average DO water
quality standard for all daily average DO values in 2022.
12
10
r� 1
5
4
Oxford Daily Average Tailrace DO Summary by Month
Apr May Jun Jul Aug Sep Oct Nov
State Daily Average DO Standard
Figure 4-48. Oxford Development: Summary of daily average dissolved oxygen (DO) concentrations
recorded in the Oxford Tailrace at USGS Water Quality Monitoring Station 0214196125, April 1-
November 30, 2022.
73

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Oxford Development instantaneous tailrace temperatures from April through November 2022 are
summarized in Figure 4-49. The Oxford Development met the North Carolina instantaneous
temperature water quality standard for all readings in 2022 except for two instantaneous readings of
29.1 °C in July 2022.
Oxford Instantaneous Tailrace Temperature Summary by Month
35
30
j 25
0
20
N
Q
E
15
10
5
Apr May Jun Jul Aug Sep Oct Nov
State Instantaneous Temperature Standard
Figure 4-49. Oxford Development: Summary of instantaneous temperatures recorded in the Oxford
Tailrace at USGS Water Quality Monitoring Station 0214196125, April 1-November 30, 2022.
74

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.3.4 Lookout Shoals Development
Lookout Shoals Development instantaneous DO concentrations from April through November 2022 are
summarized in Figure 4-50. The Lookout Shoals Development the North Carolina instantaneous DO
water quality standard for all readings in 2022.
Lookout Shoals Instantaneous Tailrace DO Summary by Month
10
_J 9
0)
C: 8
a)
0)
0 7
> 6
0
4
3
n
Apr May Jun Jul Aug Sep Oct Nov
State Instantaneous DO Standard
Figure 4-50. Lookout Shoals Development: Summary of instantaneous dissolved oxygen (DO)
concentrations recorded in the Lookout Shoals Tailrace at USGS Water Quality Monitoring Station
0214244102, April 1-November 30, 2022.
75

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Lookout Shoals Development daily average DO concentrations from April through November 2022 are
summarized in Figure 4-51. The Lookout Shoals Development met the North Carolina daily average DO
water quality standard for all daily average DO values in 2022.
Lookout Shoals Daily Average Tailrace DO Summary by Month
10
9
0)
!_
C
O 8
0)
X
0
_0 7
(D
O
6
r)
5
4
13
13
0 Ell
Apr May Jun Jul Aug Sep Oct Nov
State Daily Average DO Standard
Figure 4-51. Lookout Shoals Development: Summary of daily average dissolved oxygen (DO)
concentrations recorded in the Lookout Shoals Tailrace at USGS Water Quality Monitoring Station
0214244102, April 1-November 30, 2022.
76

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Lookout Shoals Development instantaneous tailrace temperatures from April through November 2022
are summarized in Figure 4-52. The Lookout Shoals Development met the North Carolina instantaneous
temperature water quality standard for all readings in 2022.
Lookout Shoals Instantaneous Tailrace Temperature Summary by Month
35
CA
U 25
0
L
m 20
Q
H 15
10
5
0 0
o
0
■
■
0
o
o ■
■ o
Apr May Jun Jul Aug Sep Oct Nov
State Instantaneous Temperature Standard
Figure 4-52. Lookout Shoals Development: Summary of instantaneous tailrace temperatures recorded
in the Lookout Shoals Tailrace at USGS Water Quality Monitoring Station 0214244102, April 1-
November 30, 2022.
77

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.3.5 Cowans Ford Development (Lake Norman)
Cowans Ford Development instantaneous DO concentrations from April through November 2022 are
summarized in Figure 4-53. In 2022, there were seven recorded instantaneous DO measurements below
the 4.0 mg/L North Carolina standard for instantaneous DO. One reading occurred on July 17, one on
July 19, one on July 21, one on July 22, two on July 26, and one on July 29 (Figure 4-54). As in previous
years, all readings below the DO standard occurred near the startup of unit generation and subsequent
readings were above 4.0 mg/L (Figure 4-54).
12
10
J
0)
E
a 8
0)
X
0
W 6
0
U)
U)
4
2
Cowans Ford Instantaneous Tailrace DO Summary by Month
n
0 0
13
-T- Fj�
Apr May Jun Jul Aug Sep Oct Nov
State Instantaneous DO Standard
Figure 4-53. Cowans Ford Development: Summary of instantaneous dissolved oxygen (DO)
concentrations recorded in the Cowans Ford Tailrace at USGS Water Quality Monitoring Station
0214264790 when Cowans Ford Hydro Station was generating, April 1-November 30, 2022.
78

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
12
J
E 10
c
8
x
0 6
`W
0 4
Cn
r)
2
Cowans Ford July 15 - August 1 Instantaneous Tailrace DO
•
i
• i
;
• 1
t I
07/15/22 07/19/22 07/23/22 07/27/22
• Instantaneous DO State Instantaneous DO Standard
07/31 /22
Figure 4-54. Cowans Ford Development: Tailrace instantaneous dissolved oxygen (DO) concentrations
from July 1-August 1, 2022, documenting deviations from the North Carolina instantaneous DO
standard of 4.0 mg/L or greater while Cowans Ford Hydro Station was generating.
79

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Cowans Ford Development daily average DO concentrations from April through November 2022 are
summarized in Figure 4-55. In 2022, there was one daily average DO concentration that dropped below
the 5.0 mg/L North Carolina daily average DO standard on July 21 (see Figure 4-56).
12
10
J_
E
C $
a)
X
0
aa)i 6
0
U)
U)
4
2
Cowans Ford Daily Average Tailrace DO Summary By Month
0
o
o
■ ■
0
0
o
0 0 � ■ ■
■
■
Apr May Jun Jul Aug Sep Oct Nov
State Daily Average DO Standard
Figure 4-55. Cowans Ford Development: Summary of daily averages of DO concentrations recorded at
USGS Water Quality Monitoring Station 0214264790 in the Cowans Ford Tailrace while Cowans Ford
Hydro Station was generating, April 1-November 30, 2022.
IE

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
12
10
0
4
2+-
7/1 /22
Cowans Ford July Daily Average Tailrace DO
7/8/22 7/15/22
7/22/22 7/29/22
• Daily Average DO State Daily Average DO Standard
Figure 4-56. Cowans Ford Development: Daily averages of DO concentrations recorded at USGS Water
Quality Monitoring Station 0214264790 in the Cowans Ford Tailrace while Cowans Ford Hydro Station
was generating, July 1-July31, 2022, documenting one deviation from the North Carolina standard of
5.0 mg/I or greater for daily average DO.
81

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Cowans Ford Development instantaneous tailrace temperatures from April through November 2022 are
summarized in Figure 4-57. The Cowans Ford Development met the North Carolina instantaneous
temperature water quality standard for all readings in 2022.
Cowans Ford Instantaneous Tailrace Temperature Summary by Month
35
30
�j 25
0
CU 20
L
Q
E
15
10
5
0
0
o
■
o ■
0
■ � o
■
0
■
M 0
Apr May Jun Jul Aug Sep Oct Nov
State Instantaneous Temperature Standard
Figure 4-57. Cowans Ford Development: Summary of instantaneous temperatures recorded in the
Cowans Ford Tailrace at USGS Water Quality Monitoring Station 0214264790 while Cowans Ford
Hydro Station was generating, April 1-November 30, 2022.
82

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.3.6 Mountain Island Development
Mountain Island Development instantaneous DO concentrations from April through November 2022 are
summarized in Figure 4-58. The Mountain Island Development met the North Carolina instantaneous
DO water quality standard for all readings in 2022.
Mountain Island Instantaneous Tailrace DO Summary by Month
14
12
J
E 10
C
0 $
W
0 6
U)
U)
Id
4
2
° ° °
ED ° °
°
° ° � ■
■
■ E ■
Apr May Jun Jul Aug Sep Oct Nov
State Instantaneous DO Standard
Figure 4-58. Mountain Island Development: Summary of instantaneous dissolved oxygen (DO)
concentrations recorded in the Mountain Island tailrace at USGS Water Quality Monitoring Station
0214267602 while Mountain Island Hydro Station was generating, April 1-November 30, 2022.
83

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Mountain Island Development daily average DO concentrations from April through November 2022 are
summarized in Figure 4-59. The Mountain Island Development met the North Carolina daily average DO
water quality standard for all daily average DO values in 2022.
Mountain Island Daily Average Tailrace DO Summary By Month
12
10
J
0)
C
N 8
X
0
6
0
U)
r)
4
2
Apr May Jun Jul Aug Sep Oct Nov
State Daily Average DO Standard
Figure 4-59. Mountain Island Development: Summary of daily averages of dissolved oxygen (DO)
concentrations recorded at USGS Water Quality Monitoring Station 0214267602 in the Mountain
Island Tailrace while Mountain Island Hydro Station was generating, April 1-November 30, 2022.
84

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Mountain Island Development instantaneous temperatures from April through November 2022 are
summarized in Figure 4-60. The Mountain Island development met the North Carolina instantaneous
temperature water quality standard for all readings in 2022.
Mountain Island Instantaneous Tailrace Temperature Summary by Month
35
30
�j 25
0
E
H 15
10
5
o °
o n
0
■
■ o
o
0
■
■
El
Apr May Jun Jul Aug Sep Oct Nov
State Instantaneous Temperature Standard
Figure 4-60. Mountain Island Development: Summary of instantaneous temperatures recorded in the
Mountain Island tailrace at USGS Water Quality Monitoring Station 0214267602 while Mountain
Island Hydro Station was generating, April 1-November 30, 2022.
85

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.3.7 Wylie Development
Wylie Development instantaneous DO concentrations from April through November 2022 are
summarized in Figure 4-61. The Wylie Development met the South Carolina instantaneous DO water
quality standard for all readings in 2022.
14
12
10
C: 8
a)
x g
a)
> 4
0
U)
0
Wylie Instantaneous Tailrace DO Summary by Month
0
E o
o
o
M
Apr May Jun Jul Aug Sep Oct Nov
State Instantaneous DO Standard
Figure 4-61. Wylie Development: Summary of instantaneous tailrace dissolved oxygen (DO)
concentrations recorded in the Wylie Tailrace at USGS Water Quality Monitoring Station 02145910,
April 1-November 30, 2022.

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Wylie Development daily average DO concentrations from April through November 2022 are
summarized in Figure 4-62. The Wylie Development met the South Carolina daily average DO water
quality standard for all daily average DO values in 2022.
10
9
0)
E
C
a> 8
O7
X
0
_0 7
(D
O
6
r)
5
4
Wylie Daily Average Tailrace DO Summary by Month
Apr May Jun Jul Aug Sep Oct Nov
State Daily Average DO Standard
Figure 4-62. Wylie Development: Summary of daily average dissolved oxygen (DO) concentrations
recorded in the Wylie Tailrace at USGS Water Quality Monitoring Station 02145910, April 1-November
30, 2022.
87

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Wylie Development instantaneous temperatures from April through November 2022 are summarized in
Figure 4-63. The Wylie Development met the South Carolina instantaneous temperature water quality
standard for all readings in 2022.
Wylie Instantaneous Tailrace Temperature Summary by Month
35
30
�j 25
0
N
20
N
Q
E
H 15
10
5
Apr May Jun Jul Aug Sep Oct Nov
State Instantaneous Temperature Standard
Figure 4-63. Wylie Development: Summary of instantaneous tailrace temperatures recorded in the
Wylie tailrace at USGS Water Quality Monitoring Station 02145910, April 1-November 30, 2022.

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.3.8 Fishing Creek Development
Fishing Creek Development instantaneous DO concentrations from April through November 2022 are
summarized in Figure 4-64. In 2022 there were three recorded instantaneous DO values that were
below the 4.0 mg/L South Carolina standard for instantaneous DO (Figure 4-65). The readings occurred
on July 5, July 7, and July 8. The minimum reading was 3.6 mg/L occurring on July 8. As in previous
years, all readings below the DO standard occurred near the startup of unit generation and subsequent
readings were above 4.0 mg/L. These brief deviations did not result in a daily average DO below the 5.0
mg/L South Carolina standard (see Figure 4-65). This monitoring system failed due to a thunderstorm in
the area on July 8 at 2100 hours. It was repaired and returned to service on July 11 at 1215 hours (see
Figure 4-65).
14
12
J
0)
E 10
C
a)
0)
O $
N
0 6
W
Fishing Creek Instantaneous Tailrace DO Summary by Month
A
2
13
13
13
13
13
Apr May Jun Jul Aug Sep Oct Nov
State Instantaneous DO Standard
Figure 4-64. Fishing Creek Development: Summary of instantaneous dissolved oxygen (DO)
concentrations recorded in the Fishing Creek tailrace at USGS Water Quality Monitoring Station
02147310 while Fishing Creek Hydro Station was generating, April 1-November 30, 2022.
:•

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
10
9
c 8
x 7
O
6
0
U)
D 5
0
4
3 4-
06/01 /22
Fishing Creek June - July Instantaneous DO Data
06/15/22 06/29/22 07/13/22
Instantaneous DO State Instantaneous DO Standard
07/27/22
Figure 4-65. Fishing Creek Development: Instantaneous dissolved oxygen (DO) concentrations
recorded in the Fishing Creek Tailrace at USGS Water Quality Monitoring Station 02147310 while
Fishing Creek Hydro Station was generating, June 1-July 31, 2022, demonstrating deviations from the
South Carolina >_ 4.0 mg/L instantaneous DO standard.
.E

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Fishing Creek Development daily average DO concentrations from April through November 2022 are
summarized in Figure 4-66. The Fishing Creek Development met the South Carolina daily average DO
water quality standard for all daily average DO values in 2022.
I&
Fishing Creek Daily Average Tailrace DO Summary By Month
12
10
0
A
4
2
0
0
o
E ■
■
Apr May Jun Jul Aug Sep Oct Nov
State Daily Average DO Standard
Figure 4-66. Fishing Creek Development: Summary of daily averages of dissolved oxygen (DO)
concentrations recorded in the Fishing Creek Tailrace at USGS Water Quality Monitoring Station
02147310 while Fishing Creek Hydro Station was generating, April 1-November 30, 2022.
91

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Fishing Creek Development instantaneous tailrace temperatures from April through November 2022 are
summarized in Figure 4-67. The Fishing Creek Development met the South Carolina instantaneous
temperature water quality standard for all readings in 2022.
Fishing Creek Instantaneous Tailrace Temperature Summary by Month
35
0H
IN
0
25
L
y-+
L
N
E 20
15
10
13
13
13
13 FD E!�
13
13
Apr May Jun Jul Aug Sep Oct Nov
State Instantaneous Temperature Standard
Figure 4-67. Fishing Creek Development: Summary of instantaneous temperatures recorded in the
Fishing Creek Tailrace at USGS Water Quality Monitoring Station 02147310 while Fishing Creek Hydro
Station was generating, April 1-November 30, 2022.
92

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.3.9 Great Falls -Dearborn Development
Great Falls -Dearborn Development instantaneous DO concentrations from April through November
2022 are summarized in Figure 4-68. The Great Falls -Dearborn Development met the South Carolina
instantaneous DO water quality standard for all readings in 2022.
Great Falls -Dearborn InstantaneousTaiIrace DO Summary by Month
14
12
J
E 10
C
N
0 8
41
0 6
U)
lid
2
13
1Be
13 13
Apr May Jun Jul Aug Sep Oct Nov
State Instantaneous DO Standard
Figure 4-68. Great Falls -Dearborn Development: Summary of instantaneous dissolved oxygen (DO)
concentrations recorded in the Great Falls -Dearborn Tailrace at USGS Water Quality Monitoring
Station 021474095 while Dearborn Hydro Station was generating, April 1-November 30, 2022.
93

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Great Falls -Dearborn Development daily average DO concentrations from April through November 2022
are summarized in Figure 4-69. The Great Falls -Dearborn Development met the South Carolina daily
average DO water quality standard for all daily average DO values in 2022.
Great Falls -Dearborn Daily Average Tailrace DO Summary By Month
12
10
J
0)
E
C 8
x
0
W6
0
U)
4
2
13
E�!] Ej�
Apr May Jun Jul Aug Sep Oct Nov
State Daily Average DO Standard
Figure 4-69. Great Falls -Dearborn Development: Summary of daily averages of tailrace dissolved
oxygen (DO) concentrations recorded in the Great Falls -Dearborn tailrace at USGS Water Quality
Monitoring Station 021474095 while Dearborn Hydro Station was generating, April 1-November 30,
2022.
94

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Great Falls -Dearborn Development instantaneous tailrace temperatures from April through November
2022 are summarized in Figure 4-70. The Great Falls -Dearborn Development met the South Carolina
instantaneous temperature water quality standard for all readings in 2022.
Great Falls -Dearborn Instantaneous Tailrace Temperature Summary by Month
U
0
35
30
4".
L
E 20
N
H
15
10
Apr May Jun Jul Aug Sep Oct Nov
State Instantaneous Temperature Standard
Figure 4-70. Great Falls -Dearborn Development: Summary of instantaneous temperatures recorded in
the Great Falls -Dearborn Tailrace at USGS Water Quality Monitoring Station 021474095 while
Dearborn Hydro Station was generating, April 1-November 30, 2022.
9S

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.3.10 Rocky Creek -Cedar Creek Development
Rocky Creek -Cedar Creek Development instantaneous DO concentrations from April through November
2022 are summarized in Figure 4-71. The Rocky Creek -Cedar Creek Development met the South
Carolina instantaneous DO water quality standard for all readings in 2022.
Rocky Creek -Cedar Creek Instantaneous Tailrace DO Summary by Month
14
12
J
E 10
C
O 8
4)
o g
U)
rid
4
2
13
13
ED 13 13
13
Apr May Jun Jul Aug Sep Oct Nov
State Instantaneous DO Standard
Figure 4-71. Rocky Creek -Cedar Creek Development: Summary of instantaneous dissolved oxygen (DO)
concentrations recorded in the Cedar Creek Tailrace at USGS Water Quality Monitoring Station
02147505 while Cedar Creek Hydro Station was generating, April 1-November 30, 2022.

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Rocky Creek -Cedar Creek Development daily average DO concentrations from April through November
2022 are summarized in Figure 4-72. The Rocky Creek -Cedar Creek Development the South Carolina
daily average DO water quality standard for all daily average DO values in 2022.
Rocky Creek -Cedar Creek Daily Average Tailrace DO Summary By Month
12
10
J
0)
C
4) 8
X
0
6
0
U)
4
2
13
13
G 13 13
0 Ef�] E5
E:�l 0
Apr May Jun Jul Aug Sep Oct Nov
State Daily Average DO Standard
Figure 4-72. Rocky Creek -Cedar Creek Development: Summary of daily averages of dissolved oxygen
(DO) concentrations recorded in the Cedar Creek Tailrace at USGS Water Quality Monitoring Station
02147505 while Cedar Creek Hydro Station was generating, April 1-November 30, 2022.
97

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Rocky Creek -Cedar Creek Development instantaneous tailrace temperatures from April through
November 2022 are summarized in Figure 4-73. The Rocky Creek -Cedar Creek Development the South
Carolina instantaneous temperature water quality standard for all readings in 2022.
Rocky Creek -Cedar Creek Instantaneous Tailrace Temperature Summary by Month
35
CIR
15
10
Apr May Jun Jul Aug Sep Oct Nov
State Instantaneous Temperature Standard
Figure 4-73. Rocky Creek -Cedar Creek Development: Summary of instantaneous temperatures
recorded in the Cedar Creek Tailrace at USGS Water Quality Monitoring Station 02147505 while Cedar
Creek Hydro Station was generating, April 1-November 30, 2022.
m

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
4.3.11 Wateree Development
The Wateree Development is subject to compliance with FWQIP interim measures for DO enhancement
as described in Section 3.3 because Unit 5 was not commissioned for dissolved oxygen compliance in
2022. The FERC was notified of Unit 5 commissioning for generation and flow on January 4, 2023.
Testing for DO commissioning will occur in the summer of 2023.
During 2022, DO values were recorded in the tailrace below 4 mg/L between late June and early
September, 2022 with one additional reading below 4.0 mg/I in October, 2022 (Figure 4-74). During
these periods, Unit 1 or Unit 3 are required to be operated first-on/last-off to provide aeration in the
tailrace. This requirement was met at all times in 2022. On these dates and times, generation at the
Wateree Development follows the FWQIP interim measures. The data showing that Unit 1 or unit 3
were the first on/last off is provided in Appendix D. Table 4-4 below has been provided showing an
example of how this data is being presented in Appendix D.
Wateree Development June - September DO data with Interim Measures
12
10
J
0)
E
8
N
X
O 6
0
0
4
YX
2
06/01 /22 07/01 /22 08/01 /22 09/01 /22 10/01 /22
Instantaneous DO Above DO Standard
State Instantaneous DO Standard
x Instantaneous DO Below Standard While DO Enhancement Measures Met
• Instantaneous DO Below Standard While DO Enhancement Not Met
Figure 4-74. Wateree Development: Instantaneous dissolved oxygen (DO) concentrations recorded in
the Wateree Tailrace between June 1-October 31, 2022.
• •

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
Table 4-4. Selection of DO data from Wateree Tailrace and unit generation status demonstrating
compliance with Interim Measures for Providing DO Enhancement. Full data are included in Appendix
D-1.
Date/Time
U1
MW
U2
MW
U3
MW
U4
MW
U5
MW
DO Values
During
Generation and
Non -generation
(mg/L)
DO values
During
Generation
(mg/L)
Are Units
Generating?
Is Unit 1
Generating
When DO <
4.0 mg/L?
Is Unit 3
Generating
while DO <
4.0 mg/L?
Interim
Enhancement
Measures
Met?
7/1/22 1:45 PM
0
0
0
0
0
3.8
No
NA
NA
Yes
7/1/22 2:00 PM
17
0
0
0
0
3.5
3.5
Yes
Yes
No
Yes
7/1/22 2:15 PM
1 17
0
1 0
0
1 0
1 7.0
7
Yes
NA
NA
Yes
7/1/22 2:30 PM
17
0
0
0
0
7.0
7
Yes
NA
NA
Yes
7/1/22 2:45 PM
17
0
0
0
0
7.0
7
Yes
NA
NA
Yes
7/1/22 3:00 PM
17
0
0
0
0
7.0
7
Yes
NA
NA
Yes
7/1/22 3:15 PM
0
0
0
0
0
6.9
No
NA
NA
Yes
7/1/22 3:30 PM
0
0
0
0
0
5.8
No
NA
NA
Yes
7/1/22 3:45 PM
0
0
0
0
0
5.6
No
NA
NA
Yes
100

2022 Catawba-Wateree Hydroelectric Project Compliance Report
Reservoir Elevation, Flow, and Water Quality
5 References
Duke Energy Carolinas, LLC. 2017. Application for Amendment of License and Submittal of Flow and
Water Quality Implementation Plan and Water Quality Monitoring Plan Catawba-Wateree
Project No. 2232. May 5, 2017.
Federal Energy Regulatory Commission (FERC). 2015. Order Issuing New License for Project Number
2232-522; Duke Energy Carolinas Catawba -Wateree. November 25, 2015. FERC Order 153
62,134.
Gianfagna, C. C., Johnson, C., Chandler, D., Hoffman, C. (2015). Watershed area ratio accurately predicts
daily streamflow in nested catchments in the Catskills, New York. Journal of Hydrology: Regional
Studies, 4 (Part B), 583 — 594.
North Carolina Department of Environmental Quality. November 1, 2019. Division of Water Quality.
Accessed June 7,2022.<https://files.nc.gov/ncdeq/documents/files/15A—NCAC-02B—.0100-
.0300—O.pdf>.
South Carolina Department of Health and Environmental Control. June 26, 2020. Regulation 61-68
Water Classifications and Standards. Accessed June 7,2022.
<https://scdhec.gov/sites/default/files/Library/Regulations/R.61-68.pdf>.
101