20080915 Ver 3_NonCapacity License Amendment Jan 2023_20230308

(' DUKE
' ENERGY
January 19, 2023
Electronically Filed
The Honorable Kimberly D. Bose, Secretary
Federal Energy Regulatory Commission
888 First Street N.E.
Washington, DC 20426
WATER STRATEGY, HYDRO LICENSING
AND LAKE SERVICES
Duke Energy Corporation
Regulated and Renewable Energy
526 South Church Street / EC 12Q
Charlotte, NC 28202
Subject: Catawba-Wateree Hydroelectric Project (FERC No. 2232)
Rhodhiss Development
Application for Non -Capacity Amendment of License Amendment for
Installation of Debris Gate
Dear Secretary Bose:
Duke Energy Carolinas, LLC (Duke Energy) hereby submits for filing with the Federal Energy
Regulatory Commission (Commission or FERC) an Application for Non -Capacity Amendment of
License (Application) for the Catawba-Wateree Hydroelectric Project (Project; FERC No. 2232)
for the planned installation of a debris gate at the Rhodhiss Development. The Rhodhiss
Development, one of eleven developments (and thirteen powerhouses) that make up the
Catawba-Wateree Hydroelectric Project, is in Burke and Caldwell counties and is located a mile
and a half south of the Town of Granite Falls, North Carolina.
This Non -Capacity Amendment of License is necessary to align the description of Project works
and approved license exhibits to reflect a modification to licensed Project works. Duke Energy
proposes to install a 20-ft-wide debris gate on the overflow spillway adjacent to the powerhouse.
Addition of the debris gate to the Rhodhiss Development will eliminate the high -risk work of
removal of debris and will provide a safer and more effective means of passing accumulated
debris.
Duke Energy anticipates construction for installation of the new debris gate to commence in the
September/October 2023 timeframe and to be complete by the third quarter of 2024. The final
plans and specifications for the debris gate will be filed with the FERC Division of Dam Safety and
Inspections, Atlanta Regional Office for approval prior to construction in accordance with License
Article 301.
Duke Energy distributed a draft of this application on November 10, 2022, to the Catawba Indian
Nation (CIN) and to federal and state resource agencies as described in the enclosed Application.
The CIN and resource agencies provided timely replies, concurring with Duke Energy's
determination of no effects to Project operations and resources. Documentation of stakeholder
consultation is included in the enclosed Application (Attachment 3).

Catawba-Wateree Hydroelectric Project (FERC No. 2232)
Rhodhiss Development Non -Capacity Amendment Application
January 19, 2023
Page 2
Thank you for your attention to this request. If you have any questions, please contact Ms.
Tami Styer at [phone] or [e-mail].
Sincerely,
Jeffrey G. Lineberger, PE
Director, Water Strategy, Hydro Licensing, and Lake Services
Duke Energy Carolinas, LLC
Enclosure: Application for Non -Capacity Amendment of License, Rhodhiss Development
cc At/enclosure: Tami Styer, Duke Energy
David Cranford, Duke Energy
Wade Byrum, Duke Energy
Brad Keaton, Duke Energy
Cameron Rhyne, Duke Energy
Jennifer Bennett, Duke Energy
Sarah Santos, Duke Energy
Garry Rice, Duke Energy
Sarah Kulpa, HDR

Application for Non -Capacity
Amendment of License
Catawba-Wateree Hydroelectric Project (FERC No. 2232)
Rhodhiss Development
Prepared for:
Duke Energy Carolinas, LLC
4- DUKE
ENERGY
Prepared by:
HDR Engineering, Inc. of the Carolinas
Charlotte, North Carolina
FY
1
January 2023

Duke Energy Carolinas, LLC I Catawba-Wateree Hydroelectric Project (FERC No. 2232)
Initial Statement
BEFORE THE UNITED STATES OF AMERICA
FEDERAL ENERGY REGULATORY COMMISSION
CATAWBA-WATEREE PROJECT (FERC No. 2232)
RHODHISS DEVELOPMENT
DUKE ENERGY CAROLINAS, LLC
APPLICATION FOR A NON -CAPACITY RELATED AMENDMENT OF LICENSE FOR MAJOR PROJECT
— EXISTING DAM
INITIAL STATEMENT
(18 C.F.R. §4.201)
1. Duke Energy Carolinas, LLC (Duke Energy, Licensee, or Applicant) applies to the Federal
Energy Regulatory Commission (FERC or Commission) for a non -capacity amendment of
license for the Catawba-Wateree Hydroelectric Project (FERC No. 2232) (Project), an
existing licensed major project. The current license for the Project was issued on
November 25, 2015, and expires on October 31, 2055.
2. The exact name, business address, and telephone number of the Applicant are:
Duke Energy Carolinas, LLC
526 South Church Street
EC-12Q
Charlotte, NC 28202
The exact name and business address of each person authorized to act as agents for
the Applicant in this application are:
Jeffrey G. Lineberger, P.E.
Director of Water Strategy
and Hydro Licensing
Duke Energy
Mail Code EC-12Q
526 South Church Street
Charlotte, NC 28202
Tel: [phone]
Jeff.Lineberger@duke-
energy.com
Tamara S. Styer
Senior Project Manager
Duke Energy
Mail Code EC-12Q
526 South Church Street
Charlotte, NC 28202
Tel: [phone]
Tami.Styer@duke-
energy.com
Garry S. Rice Esq.
Deputy General Counsel
Duke Energy
Mail Code DEC45A
550 South Tryon Street
Charlotte, NC 28202
Tel: [phone]
Garry.Rice@duke-
energy.com
3. Duke Energy is a domestic limited liability company organized under the laws of the State
of South Carolina and North Carolina and licensee for the Project designated as Project
No. 2232 in the records of the Commission, license issued on November 25, 2015.
January 2023 IS-1

Duke Energy Carolinas, LLC I Catawba-Wateree Hydroelectric Project (FERC No. 2232)
Initial Statement
4. The amendment of license proposed and the reason(s) why the proposed changes are
necessary:
The Catawba-Wateree Hydroelectric Project consists of 11 reservoirs and 13 hydropower
stations along the Catawba-Wateree River system and extends through fourteen counties
in North and South Carolina. The Rhodhiss Development is in Burke and Caldwell
counties and is located a mile and a half south of the Town of Granite Falls, North Carolina.
The Rhodhiss Development consists of: (a) a 2,724-acre reservoir (Lake Rhodhiss) at full
pond elevation 995.1 feet msl (National Geodetic Vertical Datum 1929 (NVGD 29)); (b) a
70-foot-high, 1,517-foot-long dam consisting of (i) a 119.6-foot-long left concrete gravity
non -overflow section, (ii) a 194-foot-long concrete powerhouse intake section consisting
of three intakes protected by trashracks and headgates, (iii) an 800-foot-long, 70-foot-high
ungated ogee spillway with a crest elevation of 995.1 feet msl, (iv) a 55-foot-high 119.6-
foot-long right concrete non -overflow section, and (v) a 35-foot-high 283.8-foot-long
earthen embankment non -overflow section extending to the right bank; (c) a 194-foot-wide
by 60-foot-deep concrete powerhouse integral with the dam containing three vertical -
Francis turbine/generator units, with a maximum hydraulic capacity of 8,325 cfs and total
installed capacity of 32.225 MW; (d) a 0.17-mile-long, 44-kV transmission line to the
Rhodhiss Tie sub -station; and (e) appurtenant facilities.
Flows are released through the generating units and inflow that results in lake levels above
the maximum full pond elevation (995.1 ft NGVD 29) spills over the ungated spillway. Duke
Energy operates one of the generating units at efficiency load, at least once per day, to
provide the development's minimum average daily flow release requirement of 225 cfs.
Currently, there is an existing debris barrier in place upstream of the powerhouse intake
which directs floating debris towards the adjacent ungated spillway. As flow over the
spillway is not regulated, debris can build up at the spillway and in front of the powerhouse
intake trashracks before sufficient inflow is present to push it over the spillway and
downstream. Existing passage of debris requires spillway activation (more than 1 ft
overtopping) with a planned controlled spill, during natural high inflow events, or manual
removal from a boat upstream of the spillway during periods of heavy accumulation and
low inflow.
To provide passage of upstream debris at the dam, Duke Energy proposes to install a 20-
ft-wide debris gate on the overflow spillway adjacent to the powerhouse. The debris gate
will consist of a single steel gate, 5.5-ft-high, bottom -hinged, which is raised and lowered
by an inflatable bladder. The hinged portion of the gate is on the upstream side. Inflation
of the bladder is accomplished by means of compressed air. The controls, air compressor,
and other associated mechanical equipment will be housed inside the powerhouse.
Operation of the debris gate will be a function of debris accumulation at the spillway and
powerhouse intake trashracks (Attachment 1 - Design Drawings). Addition of the debris
gate to the Rhodhiss Development will eliminate the high -risk work of removal of debris
January 2023 IS-2

Duke Energy Carolinas, LLC I Catawba-Wateree Hydroelectric Project (FERC No. 2232)
Initial Statement
(5)
with a boat from the water, will eliminate the need to have controlled spills to release the
debris, and will provide a safer and more effective means of passing accumulated debris.
Duke Energy anticipates construction for installation of the new debris gate to commence
in the September/October 2023 timeframe and to be complete by the third quarter of 2024.
The final plans and specifications for the debris gate will be filed with the FERC Division
of Dam Safety and Inspections, Atlanta Regional Office for approval prior to construction
in accordance with License Article 301. This filing will include an updated spillway rating
curve to reflect the addition of the debris gate.
This non -capacity amendment of license is necessary to align the description of the
Project approved license exhibits to reflect the modification to the licensed Project works.
Installation and operation of the debris gate will not change licensed Project operations or
result in other modifications of license conditions, and no changes will be required to the
FERC Project boundary for the Rhodhiss Development.
During construction of the gate, a bulkhead will be installed to dewater the spillway section
for gate installation and a lake drawdown below the Normal Minimum Elevation is not
expected to be needed to accommodate construction. A drawdown below the Normal
Target Elevation may be required for a short duration (< 2 weeks). The License
Maintenance and Emergency Protocol will be implemented if this is the case. Construction
activities will not result in any new land disturbance.
Exhibit A — Proiect Description
In accordance with 18 CFR § 4.201(c), Duke Energy has enclosed a revised Exhibit A —
Project Description that incorporates the proposed debris gate at the Rhodhiss
Development. Duke Energy recently submitted a revised Exhibit A for the Catawba-
Wateree Project to FERC on January 25, 2022, with the Non -Capacity Amendment
Application for the installation of the inflatable gate at the Wateree Development, which
was approved by order dated September 7, 2022. A redline version and a clean version
of the revised Exhibit A are provided with this amendment application (Attachment 2).
(i) The statutory or regulatory requirements of the state(s) in which the Project would be
located that affect the Project as proposed with respect to bed and banks and to the
appropriation, diversion, and use of water for power purposes:
North Carolina law gives a riparian owner the right to make reasonable use of water in a
stream as it passes through its land. In Dunlap v. Carolina Power & Light Co., 212 N.C.
814, 195 S.E. 43 (1938), the Supreme Court of North Carolina held that reasonable use
includes the right to erect and maintain dams for power purposes. Under North Carolina
law, impounders of water enjoy more rights than a riparian owner. A person who impounds
water (i.e., builds a dam) for the purpose of water withdrawal has the right to withdraw the
"excess volume" of water attributable to the impoundment. An "excess volume" within the
meaning of North Carolina law is that volume which may be withdrawn from the
January 2023 IS-3

Duke Energy Carolinas, LLC I Catawba-Wateree Hydroelectric Project (FERC No. 2232)
Initial Statement
impoundment without reducing the rate of flow of the watercourse below that which would
exist if there were no impoundment. Unlike a general riparian owner, who has an equal
interest with all other riparian owners along the watercourse, this right to withdraw the
excess volume of water is superior to all other interests in the water. (See N.C.GEN.STAT.
§ 143-215.44).
Pursuant to Section 401 of the Clean Water Act, 33 U.S.C. § 1341(a), the Applicant must
obtain a Water Quality Certification (WQC) from the state in which the applicable release
occurs, unless the state authority waives this requirement. Any applicable release
resulting from the operation of the Project occurs wholly within the State of North Carolina.
The North Carolina Department of Environmental Quality administers WQCs pursuant to
N.C. GEN.STAT. § 143-215.3(a)(1) et seq.
(ii) The step(s) which Duke Energy has taken or plans to take to comply with the law cited
above:
The proposed installation of the debris gate on the spillway will have no significant effect
on the operation of the Project. With the distribution of this draft application, Duke Energy
requested that the North Carolina Department of Environmental Quality Division of Water
Resources (NCDWR) provide concurrence with Duke Energy's expectation that the
proposed amendment would not necessitate any modifications or further conditioning
under the WQC issued by NCDWR for the Project on February 27, 2017 (DWR#08-
0915v3). A summary of the consultation with NCDWR is provided in Table 1 below and
in Attachment 3.
Commission regulations under 18 CFR § 4.38(a)(7) require the Applicant to consult with
resource agencies and Indian tribes, to the extent the proposed amendment would affect
their interests. On November 10, 2022, Duke Energy distributed a draft version of this
amendment application for review within 60 days to the following parties: The Catawba
Indian Nation (CIN), NCDWR, the North Carolina Wildlife Resources Commission
(NCWRC), and the U.S. Fish and Wildlife Service (USFWS).
License Article 410 for the Project requires the Licensee to implement the "Programmatic
Agreement Among the Federal Energy Regulatory Commission, the North Carolina State
Historic Preservation Office (SHPO), and the South Carolina SHPO for Managing Historic
Properties that may be Affected by Issuing a New License to Duke Energy Carolinas, LLC
for the Continued Operation and Maintenance of the Catawba-Wateree Hydroelectric
Project in Burke, McDowell, Caldwell, Catawba, Alexander, Iredell, Mecklenburg, Lincoln,
and Gaston Counties, North Carolina and in York, Lancaster, Chester, Fairfield, and
Kershaw Counties, South Carolina," executed on September 26, 2012 by the North
Carolina SHPO and on September 17, 2012 by the South Carolina SHPO, and including,
but not limited to, the approved Historic Properties Management Plan (HPMP), filed
August 29, 2006, for the Project. On July 22, 2022, Duke Energy consulted with the NC
SHPO in accordance with Article 410 of the FERC License for the Catawba-Wateree
Hydroelectric Project when undertaking changes to Project historic structures that are not
January 2023 IS-4

Duke Energy Carolinas, LLC I Catawba-Wateree Hydroelectric Project (FERC No. 2232)
Initial Statement
categorically excluded. On August 9, 2022, NC SHPO concurred that the proposed project
will have no adverse effect on the National Register -eligible Rhodhiss Dam & Powerplant
(CW0352).
Table 1 below provides the comments received in response to the agency review of the
draft Application. Copies of the referenced consultation correspondence are provided in
Attachment 3.
Table 1. Summary of Comments on Draft Application
Commenting Entity
Date of Comment
Comment
NCDWR
NCDWR: I have reviewed the attached documents
as provided. I have no comments or concerns as
they relate to the proposed installation of a dynamic
debris gate on the Rhodhiss Dam crest other than
1-9-2023 whether a 401 Certificate is required. You will need to
consult with the 401 & Buffer Permitting Branch on
that matter, if you have not already done so.
1-17-2023
1 / 18/2023
Duke Energy: Our permitting team consulted with
the Corps of Engineers — Brandee Boggs on
11/16/2022 regarding the need for a 404 permit. The
Corps determined no 404 permit is required because
there is no dredge and fill associated with the
installation of the debris gate. Therefore, no 401
permit (associated with the 404 permit) would be
required. Also, there are no permits required from a
buffer standpoint as there is no land disturbance in
the buffer associated with the project.
NCDWR: Thanks for letting me know. No questions.
I've reviewed the application for the inflatable gate at
NCWRC 1-10-2023 Rhodhiss and don't have any comments. Thanks for
the opportunity to review.
January 2023 IS-5

Duke Energy Carolinas, LLC I Catawba-Wateree Hydroelectric Project (FERC No. 2232)
Initial Statement
USFWS 1-10-2023
The USFWS has reviewed the proposed plan and
has no comments or recommendations on the
scheduled debris gate construction. According to our
records and a review of the information presented, no
listed species or their habitats occur within the
proposed project area. Therefore, we believe the
requirements under section 7 of the Act are
fulfilled. However, obligations under section 7 of the
Act must be reconsidered if: (1) new information
reveals impacts of this identified action that may
affect listed species or critical habitat in a manner not
previously considered, (2) this action is subsequently
modified in a manner that was not considered in this
review, or (3) a new species is listed or critical habitat
is determined that may be affected by the identified
action. If you need additional information from me or
if I can be of assistance in any way, please do not
hesitate to contact me. In any future correspondence
concerning this project, please reference our Log
Number 23-015.
Catawba Indian
Nation Tribal Historic
Preservation Office
(THPO)
12-14-2022
The Catawba have no immediate concerns with
regard to traditional cultural properties, sacred sites
or Native American archaeological sites within the
boundaries of the proposed project areas. However,
the Catawba are to be notified if Native American
artifacts and / or human remains are located
during the ground disturbance phase of this
project.
SHPO 8-9-2022
The proposed project will have no adverse effect on
the National Register -eligible Rhodhiss Dam &
Powerplant (CW0352). Note: SHPO was consulted
on the installation of the debris gate on 7.22.2022.
January 2023 IS-6

Duke Energy Carolinas, LLC I Catawba-Wateree Hydroelectric Project (FERC No. 2232)
Consultation Documentation
ATTACHMENT 1
DESIGN DRAWINGS
January 2023

I I I I I I I I I I
❑ ❑ ❑ ❑ ❑
74,
0 0 0
CREST OF SPILLWAY
EL 995.10
20'-0"
DEBRIS GATE
1'-6" WIDE ABUTMENT
ELEVATION LOOKING UPSTREAM
SCALE: HORIZ: 1"=100'-0"
VERT: 1 "=40'-0"
800'
SPILLWAY
SPILLWAY PLAN
SCALE: 1 "=100'-0"
20'-0"
DEBRIS GATE
❑ ❑
PT ANCHORS, TYP
(EXISTING)
PRELIMINARY
NOT FOR
CONSTRUCTION
OR
RECORDING
%i
SEE SPILLWAY
PARTIAL PLAN
ON FIGURE B
111111111 11111IIIII 11111IIIIIIIIII 11111 1111111111IIIII 11111
HDR Engineering, Inc. of the CarolinasL
FYZ
POWERHOUSE
0 0 0 -
4'-0" WIDE
ABUTMENT
POWERHOUSE
f!
/7
DESIGN ELEVATIONS
TOG CLOSED = 995.10' MAX
TOG OPEN = 989.60' MAX
NOTES:
1. ELEVATIONS BASED ON NGCD29 DATUM.
2. MOUNTING SURFACE TO BE PROVIDED BY
VENDOR.
3. THIS IS A PRELIMINARY DOCUMENT FOR
DBD. ACTUAL DIMENSIONS MAY CHANGE
DURING DETAILED DESIGN. OWNER
CONCURRENCE REQUIRED FOR CHANGES.
DUKE ENERGY CAROLINAS, LLC
RHODHISS DEBRIS GATE
PNEUMATIC SPILLWAY CREST GATE
ELEVATION AND PLAN
DATE
07/05/2022
FIGURE
FIGURE A

m
r
0
20'-0"
DEBRIS GATE
DDD
CONCRETE PIERS TO HAVE
ROUNDED SURFACE PROFILE
m
r
0
l— J
E
7
TOP OF ABUTMENT
EL 996.10
NORMAL WS EL
AND TOP OF GATE
EL 995.10
NEW CREST
EL 989.60
NEW CREST
EL 986.60
NEW CONCRETE
SPILLWAY PARTIAL PLAN
SCALE: 1 /8"=1'-0"
SPILLWAY
I CREST
FLOW
SECTION
SCALE: NOT TO SCALE
NAPPE BREAKER
GATE CLOSED POSITION
GATE OPEN POSITION
SURFACE TO HAVE RADIUS
TO ENSURE NO DEBRIS
BUILD-UP BELOW THE GATE
PT ANCHOR
// (EXISTING)
PRELIMINARY
NOT FOR
CONSTRUCTION
OR
RECORDING
HDR Engineering, Inc. of the Carolinas
NOTES:
1. THIS IS A PRELIMINARY DOCUMENT FOR DBD.
ACTUAL DIMENSIONS MAY CHANGE DURING
DETAILED DESIGN. OWNER CONCURRENCE
REQUIRED FOR CHANGES.
DUKE ENERGY CAROLINAS, LLC
RHODHISS DEBRIS GATE
PNEUMATIC SPILLWAY CREST GATE
PARTIAL PLAN AND SECTION
DATE
07/05/2022
FIGURE
FIGURE B

Duke Energy Carolinas, LLC I Catawba-Wateree Hydroelectric Project (FERC No. 2232)
Revised Exhibit A
ATTACHMENT 2
REVISED EXHIBIT A (STRIKETHROUGH AND FINAL VERSIONS)
January 2023

Duke Energy Carolinas, LLC I Catawba-Wateree Hydroelectric Project (FERC No. 2232)
Revised Exhibit A
Strikethrough Version*
*Note: Text shown in gray highlight on pages A-40 to A-41 reflects Exhibit A updates currently
pending FERC approval, as provided in the Licensee's 12/22/2022 Non -Capacity Amendment
Application for Mountain Island Development Embankment Seismic Stability Improvements
January 2023

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
TABLE OF CONTENTS
EXHIBIT A - PROJECT DESCRIPTION A-1
A1.0 Facilities Design A-2
A1.1 System Capacity A-2
A1.2 Bridgewater Development A-4
A1.2.1 Overview A-4
A1.2.2 Dams A-4
A1.2.3 Spillways A-6
A1.2.4 Intake A-7
A1.2.5 Water Conveyance A-8
A1.2.6 Powerhouse A-8
A1.2.7 Tailrace A-9
A1.2.8 Other Structures A-9
A1.2.9 Impoundment A-9
A1.2.10 Bypassed Reaches A-10
A 1.2.1 1 Turbine/Generators A-10
A1.2.12 Primary Transmission Lines in the Project A-11
A 1.2.13 Switchyards A-11
A1.2.14 Federal Lands A-12
A1.3 Rhodhiss Development A-13
A1.3.1 Overview A-13
A1.3.2 Dam A-13
A1.3.3 Spillways A-14
A1.3.4 Intake A-15
A1.3.5 Water Conveyance A-15
A1.3.6 Powerhouse A-15
A1.3.7 Tailrace A-16
A1.3.8 Other Structures A-16
A1.3.9 Impoundment A-17
A1.3.10 Bypassed Reaches A-17
A1.3.11 Turbine/Generators A-17
A1.3.12 Primary Transmission Lines in the Project A-19
A 1.3.13 Switchyards A-19
A 1.3.14 Federal Lands A-19

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A 1.4 Oxford Development A-20
A 1.4.1 Overview A-20
A 1.4.2 Dam A-20
A1.4.3 Spillways A-21
A1.4.4 Intake A-22
A1.4.5 Water Conveyance A-22
A1.4.6 Powerhouse A-22
A1.4.7 Tailrace A-23
A1.4.8 Other Structures A-23
A 1.4.9 Impoundment A-24
A1.4.10 Bypassed Reaches A-24
A1.4.11 Turbine/Generators A-24
A1.4.12 Primary Transmission Lines in the Project A-25
A1.4.13 Switchyards A-26
A1.4.14 Federal Lands A-26
A1.5 Lookout Shoals A-27
A1.5.1 Overview A-27
A1.5.2 Dam A-27
A1.5.3 Spillways A-28
A 1.5.4 Intake A-29
A1.5.5 Water Conveyance A-29
A1.5.6 Powerhouse A-30
A1.5.7 Tailrace A-30
A1.5.8 Other Structures A-31
A1.5.9 Impoundment A-31
A1.5.10 Bypassed Reaches A-31
A1.5.11 Turbine/Generators A-31
A1.5.12 Primary Transmission Lines in the Project A-33
A1.5.13 Switchyards A-33
A1.5.14 Federal Lands A-33
A1.6 Cowans Ford Development A-34
A1.6.1 Overview A-34
A 1.6.2 Dams A-34
A1.6.3 Spillway A-35
ii

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.6.4 Intake A-35
Al .6.5 Water Conveyance A-36
A1.6.6 Powerhouse A-36
A1.6.7 Tailrace A-37
A1.6.8 Other Structures A-37
A1.6.9 Impoundment A-38
A1.6.10 Bypassed Reaches A-38
A1.6.11 Turbine/Generators A-38
A1.6.12 Primary Transmission Lines in the Project A-39
A1.6.13 Switchyards A-39
A1.6.14 Federal Lands A-39
A1.7 Mountain Island Development A-40
A 1.7.1 Overview A-40
A1.7.2 Dam A-40
A1.7.3 Spillway A-41
A1.7.4 Intake A-42
A1.7.5 Water Conveyance A-43
A1.7.6 Powerhouse A-43
A1.7.7 Tailrace A-43
A1.7.8 Other Structures A-44
A 1.7.9 Impoundment A-44
A1.7.10 Bypassed Reaches A-44
A1.7.11 Turbine/Generators A-45
A1.7.12 Primary Transmission Lines in the Project A-46
A1.7.13 Switchyards A-46
A1.7.14 Federal Lands A-46
A1.8 Wylie Development A-47
A1.8.1 Overview A-47
A1.8.2 Dam A-47
A1.8.3 Spillways A-48
A1.8.4 Intake A-49
A1.8.5 Water Conveyance A-49
A 1.8.6 Powerhouse A-50
A1.8.7 Tailrace A-50
iii

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Al .8.8 Other Structures A-51
Al .8.9 Impoundment A-51
Al .8.10 Bypassed Reaches A-52
A1.8.11 Turbine/Generators A-52
A1.8.12 Primary Transmission Lines in the Project A-53
A1.8.13 Switchyards A-53
A1.8.14 Federal Lands A-53
A1.9 Fishing Creek Development A-54
A1.9.1 Overview A-54
A1.9.2 Dam A-54
A1.9.3 Spillways A-55
A1.9.4 Intake A-56
A1.9.5 Water Conveyance A-56
A1.9.6 Powerhouse A-56
A1.9.7 Tailrace A-57
A1.9.8 Other Structures A-58
A1.9.9 Impoundment A-58
A1.9.10 Bypassed Reaches A-58
A1.9.11 Turbine/Generators A-58
A1.9.12 Primary Transmission Lines in the Project A-60
A1.9.13 Switchyards A-60
A1.9.14 Federal Lands A-60
A1.10 Great Falls -Dearborn Development A-61
A1.10.1 Overview A-61
A1.10.2 Dams A-61
A1.10.3 Spillways A-62
A1.10.4 Intakes A-63
A1.10.5 Water Conveyance A-64
A1.10.6 Powerhouse A-64
A1.10.7 Tailrace A-66
A1.10.8 Other Structures A-67
A1.10.9 Impoundment A-67
A 1.10.10 Bypassed Reaches A-67
A 1.10.11 Turbine/Generators A-68
iv

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.10.12 Primary Transmission Lines in the Project A-70
A1.10.13 Switchyards A-70
A1.10.14 Federal Lands A-70
A1.11 Rocky Creek -Cedar Creek Development A-71
A1.11.1 Overview A-71
A1.11.2 Dams A-71
A1.11.3 Spillways A-72
A1.11.4 Intake A-73
A1.11.5 Water Conveyance A-74
A1.11.6 Powerhouses A-74
A1.11.7 Tailrace A-76
A1.11.8 Other Structures A-76
A1.11.9 Impoundment A-76
A1.11.10 Bypassed Reaches A-77
A 1.11.11 Turbine/Generators A-77
A1.11.12 Primary Transmission Lines in the Project A-79
A1.11.13 Switchyards A-79
A1.11.14 Federal Lands A-79
A1.12 Wateree Development A-80
A1.12.1 Overview A-80
A1.12.2 Dam A-80
A1.12.3 Spillways A-81
A1.12.4 Intake A-82
A1.12.5 Water Conveyance A-82
A1.12.6 Powerhouse A-82
A1.12.7 Tailrace A-83
A1.12.8 Trap, Sort and Transport Facility and Other Structures A-83
A1.12.9 Impoundment A-84
A1.12.10 Bypassed Reaches A-85
A1.12.11 Turbine/Generators A-85
A1.12.12 Primary Transmission Lines in the Project A-86
A1.12.13 Switchyards A-86
A1.12.14 Federal Lands A-86
v

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
LIST OF FIGURES
Figure A1.0-1. Rivers Map
Figure A1.1-2. Catawba-Wateree Area System Map
Figure A1.1-3.
Figure A1.1-4.
Figure A1.1-5.
Figure A1.1-6.
Figure A1.1-7.
Figure A1.1-8.
Figure A1.1-9.
A-3
A-87
Catawba-Wateree Bridgewater Development Lake James A-88
Catawba-Wateree Rhodiss Development — Lake Rhodiss A-89
Catawba-Wateree Oxford Development — Lake Hickory A-90
Catawba-Wateree Lookout Shoals Development — Lookout Shoals Lake A-91
Catawba-Wateree Cowans Ford Development — Lake Norman A-92
Catawba-Wateree Mountain Island Development — Mountain Island Lake A-93
Catawba-Wateree Wylie Development — Lake Wylie A-94
Figure A1.1-10. Catawba-Wateree Fishing Creek, Great Falls -Dearborn, Rocky Creek -Cedar
Creek Developments — Fishing Creek, Great Falls -Dearborn, Rocky Creek -Cedar Creek
Reservoirs A-95
Figure A1.1-11. Catawba-Wateree Wateree Development — Lake Wateree A-96
LIST OF TABLES
Table A1.2-1. Catawba Dam Features A-5
Table A1.2-2. Paddy Creek Dam Features A-5
Table A1.2-3. Linville Dam Features A-6
Table A1.2-4. Catawba Spillway Features A-6
Table A1.2-5. Linville -Paddy Creek Spillway Features A-7
Table A1.2-6. Linville Intake Features A-7
Table A1.2-7. Bridgewater Water Conveyance Features A-8
Table A1.2-8. Bridgewater Tailrace Features A-9
Table A1.2-9. Bridgewater Impoundment A-10
Table A1.2-10. Bridgewater Powerhouse Features A-11
Table A1.3-1. Rhodhiss Dam Features A-14
Table A1.3-2. Rhodhiss Spillway Features A-14
Table A1.3-3. Rhodhiss Intake Features A-15
Table A1.3-4. Rhodhiss Powerhouse Features A-16
Table A1.3-5. Rhodhiss Tailrace Features A-16
Table A1.3-6. Rhodhiss Impoundment A-17
Table A1.4-1. Oxford Dam Features A-21
Table A1.4-2. Oxford Spillway Features A-21
Table A1.4-3. Oxford Intake Features A-22
vi

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.4-4.
Table A1.4-5.
Table A1.4-6.
Table A1.5-1.
Table A1.5-2.
Table A1.5-3.
Table A1.5-4.
Table A1.5-5.
Table A1.5-6.
Table A1.6-1.
Table A1.6-2.
Table A1.6-3.
Table A1.6-4.
Table A1.6-5.
Table A1.6-6.
Oxford Powerhouse Features
Oxford Tailrace Features
Oxford Impoundment
Lookout Shoals Dam Features
Lookout Shoals Spillway Features
Lookout Shoals Intake Features
Lookout Shoals Powerhouse Features
Lookout Shoals Tailrace Features
Lookout Shoals Impoundment
Cowans Ford Dam Features
Cowans Ford Spillway Features
Cowans Ford Intake Features
Cowans Ford Powerhouse Features
Cowans Ford Tailrace Features
Cowans Ford Impoundment
Table A1.7-1. Mountain Island Dam Features
Table A1.7-2. Mountain Island Spillway Features
Table A1.7-3. Mountain Island Intake Features
Table A1.7-4. Mountain Island Powerhouse Features
Table A1.7-5. Mountain Island Tailrace Features
Table A1.7-6. Mountain Island Impoundment
Table A1.8-1. Wylie Dam Features
Table A1.8-2. Wylie Spillway Features
Table A1.8-3. Wylie Intake Features
Table A1.8-4. Wylie Powerhouse Features
Table A1.8-5. Wylie Tailrace Features
Table A1.8-6. Wylie Impoundment
Table A1.9-1. Fishing Creek Dam Features
Table A1.9-2. Fishing Creek Spillway Features
Table A1.9-3. Fishing Creek Intake Features
Table A1.9-4. Fishing Creek Powerhouse Features
Table A1.9-5. Fishing Creek Tailrace Features
Table A1.9-6. Fishing Creek Impoundment
Table A1.10-1. Great Falls -Dearborn Dam Features
A-23
A-23
A-24
A-28
A-28
A-29
A-30
A-31
A-31
A-35
A-35
A-36
A-37
A-37
A-38
A-41
A-42
A-42
A-43
A-44
A-44
A-48
A-48
A-49
A-50
A-51
A-51
A-55
A-55
A-56
A-57
A-57
A-58
A-62
vii

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.10-2. Great Falls -Dearborn Spillway Features A-62
Table A1.10-3. Great Falls Intake Features A-63
Table A1.10-4. Dearborn Intake Features A-64
Table A1.10-5. Great Falls Powerhouse Features A-65
Table A1.10-6. Dearborn Powerhouse Features A-65
Table A1.10-7. Great Falls Tailrace Features A-66
Table A1.10-8. Dearborn Tailrace Features A-66
Table A1.10-9. Great Falls -Dearborn Impoundment A-67
Table A1.11-1. Rocky Creek -Cedar Creek Dam Features A-72
Table A1.11-2. Rocky Creek -Cedar Creek Spillway Features A-72
Table A1.11-3. Rocky Creek Intake Features A-73
Table A1.11-4. Cedar Creek Intake Features A-74
Table A1.11-5. Rocky Creek Powerhouse Features A-74
Table A1.11-6. Cedar Creek Powerhouse Features A-75
Table A1.11-7. Cedar Creek Tailrace Features A-76
Table A1.11-8. Cedar Creek Impoundment A-76
Table A1.12-1. Wateree Dam Features A-81
Table A1.12-2. Wateree Spillway Features A-81
Table A1.12-3. Wateree Intake Features A-82
Table A1.12-4. Wateree Powerhouse Features A-83
Table A1.12-5. Wateree Tailrace Features A-83
Table A1.12-6. Wateree Impoundment A-85
viii

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
EXHIBIT A - PROJECT DESCRIPTION
Regulation Defining the Content of Exhibit A
The following excerpt from the Code of Federal Regulations (CFR) at 18CFR§ 4.51(b) describes
the required content of this exhibit.
Exhibit A is a description of the project. This exhibit need not include information on project
works maintained and operated by the U.S. Army Corps of Engineers, the Bureau of Reclamation,
or any other department or agency of the United States, except for any project works that are
proposed to be altered or modified. If the project includes more than one dam with associated
facilities, each dam and the associated component parts must be described together as a discrete
development. The description for each development must contain:
(1) The physical composition, dimensions, and general configuration of any dams,
spillways, penstocks, powerhouses, tailraces, or other structures, whether existing or
proposed, to be included as part of the project;
(2) The normal maximum surface area and normal maximum surface elevation (mean sea
level), gross storage capacity, and usable storage capacity of any impoundments to
be included as part of the project;
(3) The number, type, and rated capacity of any turbines or generators, whether existing
or proposed, to be included as part of the project;
(4) The number, length, voltage, and interconnections of any primary transmission lines,
whether existing or proposed, to be included as part of the project (see 16 U.S.C. 796
(11);
(5) The specifications of any additional mechanical, electrical, and transmission
equipment appurtenant to the project; and
(6) All lands of the United States that are enclosed within the project boundary, described
under paragraph (h) of this section (Exhibit G), identified and tabulated by legal
subdivisions of a public land survey of the affected area or, in the absence of a public
land survey, by the best available legal description. The tabulation must show the
total acreage of the lands of the United States within the project boundary.
A- 1

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.0 Facilities Design
A1.1 System Capacity
The Catawba-Wateree Project has an authorized installed capacity per 18CFR§ 11.1(i) of
799.127 megawatts (MW). A complete description of the Project is provided in this Exhibit
(Figure A1.0-1). This exhibit provides a description of all current project facilities including
physical dimensions and attributes. The Licensee is proposing to take measures for providing
aquatic flows, and recreation flows and for meeting applicable water quality standards. The
implementation of these measures will require physical modifications to some Project facilities.
These measures are discussed in the Catawba-Wateree license issued November 25, 2015
including a description of proposed physical modifications. All designation of left and right
follow orientation of facing downstream.
A-2

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
Figure A1.0-1. Rivers Map
Lake = es
,. Lake
Hickory
Wba - Wateree;
Lake
Rhadhiss
Lake
Norman
_North Carolina
South Carolina
Project
Location
Map Location
North
Carolina
Fishing Creek
Reservoir
Great Falls -Dearborn
Reservoir
Lookout Shoals
Lake
Mountain
Island Lake
IB
North Carolina
South Carolina
Cedar Creek
Reservoir
Lake Wateree
),]
Legend
Catawba-Wateree Basin
Lakes and Rivers
75..000 160.W0 225000 300.000
Feet
Figure A1.0-1
Catawba-Wateree Project
Rivers Nlap
Base data and watorbodv areas derival from
Acnal Photography. 2004. Map information
',as compiled from the best availahlc sources.
Nn v.arranry is made for its accuracy and
completeness.
A-3

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
A1.2 Bridgewater Development
A1.2.1 Overview
The Bridgewater hydropower facility consists principally of three dams, two spillways, an intake
structure, and powerhouse. The dams impound the Catawba River, Paddy Creek, and Linville
River to form Lake James (Figure E1.1-2). All structures are within a four -mile radius of the
Town of Glen Alpine, North Carolina. The dams and powerhouse were first operated in May
1919.
A1.2.2 Dams
The development is comprised of three dams: the Catawba Dam, across the main stem of the
Catawba River; the Paddy Creek Dam, across Paddy Creek; and the Linville Dam, across the
Linville River. The Catawba Dam is located in McDowell and Burke Counties, North Carolina;
the other two structures are entirely in Burke County. All three dams have paved roadways on
their crests and riprap on their upstream slopes. The roadway at Catawba Dam is no longer open
to public traffic. Semi -hydraulic fills at the three dams have been or are being strengthened in
accordance with Commission order to enhance stability during a seismic event.
The Catawba Dam consists of a concrete gravity spillway structure 305 ft long by approximately
120 ft maximum height, with a concrete core wall structure 125 ft long extending from the left
side of the spillway into the Catawba embankment at its left bank; a semi -hydraulic fill earthen
embankment approximately 850 ft long extending to the right abutment; and a semi -hydraulic fill
earthen embankment approximately 1,650 ft long at the left flood plain and abutment. The
A-4

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
upstream slopes are covered by riprap to elevation 1,210 ft msl and are grassed to the crest. The
downstream slopes are covered with grass. The total length of dam is approximately 3,155 ft.
Table A1.2-1. Catawba Dam Features
Feature Description
Location Southeasterly end of Lake James; McDowell
and Burke Counties, NC
Type Semi -hydraulic fill earth and concrete gravity
Height 120 ft
Crest Length 3,155 ft
Crest Elevation 1,224 ft msl maximum, 1,222 ft msl minimum
Crest Width 20 ft
The Paddy Creek Dam is a semi -hydraulic fill earthen embankment with a maximum height of
approximately 165 ft and a length along the crest of approximately 1,610 ft. The upstream slope
is covered by riprap to elevation 1,210 ft msl and is grassed to the crest. The downstream slope is
covered with grass. State Route 1233, Powerhouse Road, is a paved highway routed across the
crest of the dam.
Table A1.2-2. Paddy Creek Dam Features
Feature Description
Location Southeasterly end of Lake James;
Burke County, NC
Type Semi -hydraulic fill earthen embankment
Height 165 ft
Crest Length 1,610 ft
Crest Elevation 1,224 ft msl
Crest Width 20 ft
The Linville Dam is a semi -hydraulic fill earthen embankment with a maximum height of
approximately 160 ft and a length along the crest of approximately 1,325 ft. The upstream slope
is covered by riprap to elevation 1,210 ft msl and is grassed to the crest. The downstream slope is
covered with grass. State Route 1233 (Powerhouse Road) is a paved highway routed across the
crest of the dam.
A-5

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.2-3. Linville Dam Features
Feature Description
Location Southeasterly end of Lake James; Burke County, NC
Type Semi -hydraulic fill earthen embankment
Height 160 ft
Crest Length 1,325 ft
Crest Elevation 1,224 ft msl
Crest Width 20 ft
A1.2.3 Spillways
Catawba Spillway, located at the Catawba Dam, is an uncontrolled concrete ogee crest spillway.
The spillway has a total length of approximately 350 ft. The 68-ft-long spillway extension, at the
south end, has a crest elevation of 1,205 ft msl. The remaining 282-ft-long original spillway
section has a crest elevation of 1,200 ft msl.
Table A1.2-4. Catawba Spillway Features
Feature Description
Type Concrete Ogee overflow
Crest Elevation 1,200 ft msl
Length 350 ft
Control Ungated
Gate Hoist Type None
Gate Control Location None
Release at Elevation 1,222 ft msl 127,200 cfs
The Linville -Paddy Creek Spillway, located midway between the Linville and Paddy Creek
Dams, is a low overflow weir, without crest control, 430 ft wide with a paved channel extending
approximately 464 ft downstream. The State Route 1233 highway bridge is located over the
entrance end of the spillway. The crest elevation of the spillway is 1,200 ft msl.
A-6

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.2-5. Linville -Paddy Creek Spillway Features
Feature
Description
Type
Crest Elevation
Purpose
Length
Control
Gate Hoist Type
Gate Control Location
Release at Elevation 1,222 ft msl
Concrete weir overflow
1,200 ft msl
Flood Control
430 ft
None
None
None
126,600 cfs
A1.2.4 Intake
The intake and the powerhouse are located at the Linville Dam on the right abutment. The
reinforced concrete intake tower is founded on an excavated rock shelf at elevation 1,070 ft msl.
The tower is connected with the powerhouse by a tunnel approximately 900 ft long. Access to
the structure is by a steel truss bridge. Intake equipment includes three bays of structural steel
trash racks; three vertical lift type head gates, constructed of a structural steel skin filled with
concrete; motor -operated screw type hoists; and vertical lift type, 14-inch diameter bypass gate
valves with cast iron frames and operating mechanism.
Table A1.2-6. Linville Intake Features
Feature
Description
Type
Control
Gate Hoist Type
Number and Size of Openings
Trash Rack Bar Size
Trash Rack Bar Spacing
Rack Cleaning
Bypass Valves
Concrete
Concrete -filled, steel reinforced vertical lift gates
Individual vertical lift screw type, motor operated
from line shaft
Three 18-ft wide by 22 ft high
6 inch wide by 0.375 inch thick
4.5 inch
None
Four 14-inch diameter vertical lift cast iron sluice
gates
A-7

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.2.5 Water Conveyance
A trapezoidal -shaped canal connects the Catawba River arm of the reservoir with the Paddy
Creek and Linville River arms to form Lake James. The canal has an excavated bottom width of
30 ft, and is approximately 216 ft wide at elevation 1,200 ft msl. The elevation at the bottom of
the canal is 39 ft below full pond elevation.
Water is supplied to the powerhouse through a single penstock approximately 900 ft long. The
upstream 320 ft was excavated in solid rock and has a horseshoe -shaped concrete lining with
inside dimensions measuring 21 ft wide by 22 ft high. The remaining downstream portion was
constructed by open cut method or by tunneling in earth or soft rock, and has circular concrete
lining with an inside diameter of 20 ft. The downstream 470 ft of this latter section has a riveted
plate steel liner and the remainder has steel reinforcing. The downstream end of the penstock,
beyond the scroll case connections, is reduced for a 6 ft diameter valve and bursting plates.
Table A1.2-7. Bridgewater Water Conveyance Features
Feature Description
Type 320 ft rock tunnel, 110 ft reinforced concrete, and 470
ft riveted steel lined penstock
Downstream Control 11-ft diameter vertical butterfly Lee type valve
Gate Hoist Type Hydraulic
Size 21 ft by 22 ft horseshoe tunnel
20-ft diameter penstock
Bypass Valves One 6-ft diameter hydraulically -operated relief valve
on end of penstock, with bursting plate(s).
A1.2.6 Powerhouse
The powerhouse is a reinforced concrete structure housing two vertical shaft Francis type turbine
main generating units and one horizontal shaft Francis type auxiliary unit sized to supply
continuous minimum flow downstream. Each unit has an isolation valve. The generating units
are sized and configured so that they can be run individually or in combinations to support the
requirements for continuous minimum flow and recreation flow in the Bridgewater tailrace as
defined in the Catawba-Wateree license issued November 25, 2015. A 24-inch fixed -cone type
valve is incorporated in the design to allow flow to bypass the auxiliary generating unit if that
unit is not available to release water. In addition, the generating units are capable of providing
A-8

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
flow aeration to enhance dissolved oxygen levels in the tailrace. The units will release water into
a short reinforced concrete lined tailrace channel which leads to the Linville River. Erosion
protection is provided on the east bank of the river. The powerhouse is a low profile configuration
with no machine hall and with the generating units fully enclosed. A traveling gantry crane to
support unit assembly and disassembly is visible on the top deck of the powerhouse.
Approximate dimensions are 120 ft long, 95 ft wide with 36 ft above ground height.
A1.2.7 Tailrace
The turbines release water through elbow type draft tubes to the Linville River and return to the
Catawba River approximately 4,500 ft downstream. Normal tailwater is at elevation 1,065 ft msl.
Table A1.2-8. Bridgewater Tailrace Features
Feature Description
Type Excavated channel
Normal Tailwater Elevation 1,065 ft msl
A1.2.8 Other Structures
There are four sluiceways in the Catawba Spillway. One of the sluiceways is used for the
minimum flow release system, and the remaining sluiceways are not functional.
Accessory electrical equipment includes items typical for any hydro station: generator circuit
breakers, control cabinets, relay boards, station service transformers, motor generator sets,
batteries, and the customary protective devices.
A1.2.9 Impoundment
Lake James is the uppermost lake on the Catawba-Wateree Project. Located in Burke and
McDowell Counties, North Carolina, the lake has approximately 153 miles of shoreline. The
reservoir was built over a seven-year period beginning in 1916, with completion in 1923. It
required the construction of three dams (Linville, Paddy Creek, and Catawba) to impound the
existing approximately 6,754-acre reservoir (full pond contour 1,200 ft msl).
A-9

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.2-9. Bridgewater Impoundment
Feature Description
Maximum Water Surface (Full Pond) 1,200 ft msl
Normal Maximum Water Surface 1,198 ft msl
Normal Minimum Water Surface 1,192 ft msl
Drainage Area 380 sq. mi.
Shoreline Length 153 mi
Estimated Gross Capacity of Lake James 275,300 ac-ft
A1.2.10 Bypassed Reaches
The two bypassed reaches associated with this development include the Catawba River Bypassed
Reach and the Paddy Creek Bypassed Reach. The Catawba River Bypassed Reach (also known
as Old Catawba River) starts at the Catawba Dam and runs approximately 5.65 miles to the
confluence with the Linville River. Tributaries to this bypassed reach include Shadrick Creek
and Muddy Creek.
The Paddy Creek Bypassed Reach starts at the Paddy Creek Dam and runs approximately 0.64
miles to the confluence with the Catawba River Bypassed Reach. There are no tributaries to the
Paddy Creek Bypassed Reach besides several small springs.
A1.2.11 Turbine/Generators
The Bridgewater Powerhouse has two vertical -shaft Francis type turbine main generating units
and one horizontal -shaft Francis type auxiliary continuous minimum flow unit. The normal gross
operating head for the generating units at peak efficiency is 136 ft. For a corresponding net head
of 128 ft including water conveyance losses, the authorized installed capacity of the powerhouse
as defined by 18CFR§ 11.1(i) is 27.867 MW. Two step-up transformers for the main units will be
located in the nearby switchyard, converting the 6.6 kV generator voltages to 100 kV. A step-up
transformer for the auxiliary unit is electrically connected to the main unit transformers and will
convert the auxiliary unit 480 V generator voltage to 6.6 kV. The existing 100 kV switchyard
accommodates the dam seismic remediation geometry and the new powerhouse electrical
requirements. The powerhouse is designed for remote control and operation from the Regulated
Renewable Operations Center in Charlotte, N.C.
A-10

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.2-10. Bridgewater Powerhouse Features
Parameter
Powerhouse
Number of Units
Turbine Type — Main Units (2)
Turbine Type — Auxiliary Unit
Generator Type
Installed Capacity'
Station Flow at Peak Efficiency
Maximum Hydraulic Capacity
Unit Flow Rate
Unit Flow (Min. Flow Unit)
Maximum Generator Output
Turbine Runner Diameter
3
Francis — Vertical
Francis — Horizontal
AC, Synchronous
27.867 MW
2,645 cfs
3,260 cfs
1,250 cfs
145 cfs
32,125 kW
Main — 95.5 inches
Auxiliary (Minimum flow) — 35 inches
' Per 18CFR§ 11.1(i)
In order to make room for the Linville Dam Seismic remediation activities, a new powerhouse at
the Bridgewater Development has been constructed approximately 200 feet downstream of the
original Bridgewater Powerhouse. A new length of steel penstock has been constructed
connecting the existing water conveyance to the new powerhouse. Hydraulic transient analysis
has confirmed that the existing water conveyance components will support the new unit
requirements without the need for surge or pressure relief devices. No modification to the existing
intake in Lake James was required.
A1.2.12 Primary Transmission Lines in the Project
There are no primary transmission lines within the Bridgewater Project Boundaries.
A1.2.13 Switchyards
A switchyard with lattice type steel structure is located directly behind the powerhouse,
approximately 100 ft from the building. Step-up transformers, circuit breakers, and other
switching equipment are located in this yard. Two step-up transformers interconnect the
powerhouse to the 100 kV transmission system. Each is rated at 25 MVA with forced -air
cooling, three-phase.
A-11

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.2.14 Federal Lands
There are no federal lands within the Bridgewater Project Boundaries.
A-12

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
A1.3 Rhodhiss Development
A1.3.1 Overview
The Rhodhiss hydropower facility consists principally of an ungated mass -concrete Ogee
spillway, an integral concrete intake -powerhouse structure, and concrete gravity non -overflow
bulkheads, which impound a narrow and long lake approximately 0.25 miles wide and 18 miles
long. A powerhouse containing three turbine units utilizes the impounded water to produce
electricity. The facility is located on the Catawba River in the Town of Rhodhiss, North
Carolina, less than 15 miles east of Morganton, North Carolina (Figure E1.1-3). The powerhouse
lies on the left (north) bank of the river in Caldwell County; the right (south) end of the dam lies
in Burke County. The dam and powerhouse were first operated in February 1925.
A1.3.2 Dam
The dam consists of a concrete gravity spillway structure 800 780 ft long by approximately 70 ft
maximum height, a concrete gravity bulkhead structure 124 ft long, a rolled fill earthen
embankment approximately 250 ft long at the right abutment, a 20 ft long debris gate, and a
concrete intake and powerhouse structure 194 ft long, and a concrete gravity bulkhead structure
119.6 ft long at the left abutment. -The debris gate, which is at the left end of the spillway
adjacent to the intake and powerhouse, is 20 ft in length and consists of a 5.5-ft-high, bottom -
hinged, steel gate raised and lowered by an inflatable bladder. The controls, compressors, and
other associated mechanical and controls equipment are housed in the powerhouse. In 2001, a
floodwall was added to the left and right bulkheads to increase the height of the walls to elevation
1,023.1 ft msl. The crest of the earthen embankment at the right bank is at elevation 1,020.1 ft
A-13

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
msl. In 2001, a sheet pile wall approximately 279 ft long with a top elevation of 1,023.1 ft msl
was installed along the upstream edge of the earthen embankment. Post -tensioned anchors were
also installed in the spillway and in the left and right bulkheads to strengthen the structures
against extreme flooding events. The total length of dam is approximately 1,517 ft.
Table A1.3-1. Rhodhiss Dam Features
Feature Description
Location
Type
Height
Crest Length
Crest Elevation
Crest Width
Southeasterly end of Lake Rhodhiss; Caldwell and
Burke Counties, NC
Rolled earth and concrete gravity
70 ft
1,517 ft
1,023.1 ft msl maximum, 1,023 ft msl minimum
10ft
A1.3.3 Spillways
The principal dam structure consists of an trngated mass -concrete Ogee spillway approximately
800-780 ft long, equipped with a single 5.5-ft-high, 20 ft long, bottom -hinged, steel gate raised
and lowered by an inflatable bladder. The gate is operated to pass debris at the spillway. The
spillway has no crest control. The crest of the spillway and full pond reservoir level is at
elevation 995.1 ft msl. The crest of the open debris gate is 989.6 ft msl.
Table A1.3-2. Rhodhiss Spillway Features
Feature
Description
Type
Crest Elevation
Length (ungated)
Length (gated)
Top of Gate Elevation
Crest Elevation with Gates Lowered
Control
Gate Hoist Type
Gate Control Location
Release at Elevation 1,023.1 ft msl
Concrete Ogee overflow
995.1 ft msl
880-780 ft
20 ft
995.1 ft
989.6 ft
1 bottom -hinged gate None
Inflatable bladderNone
PowerhouseNone
506,110 cfs
A-14

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.3.4 Intake
The intake and powerhouse are integral structures constructed from reinforced and mass concrete
sandwiched between the left end of the spillway and the left non -overflow bulkhead. There are
three separate intakes, one for each turbine. Each intake has two sets of structural steel trash
racks. There are a total of six horizontal butterfly Lee type headgates and frames. The headgates
are constructed from cast iron and steel, and are operated by six vertical screw type stems that are
motor operated. Each unit has a 30-inch diameter headgate bypass sluice gate with manual floor
stand operator.
Table A1.3-3. Rhodhiss Intake Features
Feature
Description
Type
Control
Gate Hoist Type
Number and Size of Openings
Trash Rack Bar Size
Trash Rack Bar Spacing
Rack Cleaning
Bypass Valves
Concrete
Six cast iron and steel horizontal butterfly Lee type
Individual vertical lift screw type, motor operated
from line shaft
Six 15.5-ft wide by 21.5 ft high
4 inch wide by 0.375 inch thick
4.5 inch
None
Three 30-inch diameter vertical lift cast iron sluice
gates
A1.3.5 Water Conveyance
The intake and powerhouse structures are an integral part of the dam, without independent
penstocks or flumes.
A1.3.6 Powerhouse
The powerhouse has a reinforced concrete substructure with a steel frame and brick
superstructure, constructed in monoliths for each unit. An erection and service bay is located at
the inshore end. A 100-ton bridge type crane is provided on -site.
A-15

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.3-4. Rhodhiss Powerhouse Features
Feature Description
STRUCTURE
Type Indoor, aboveground powerhouse
Construction Reinforced cast -in -place concrete substructure and
floor
Steel frame with brick walls above generator floor
FEATURES
Turbines Three vertical axis, Francis type
Generators Three vertical shaft, waterwheel type, direct
connected above turbines
CONTROL ROOM
Location Local control room is in the left end of the
powerhouse
ANCILLARY EQUIPMENT
Overhead Crane Type Traveling Bridge, Niles
Main Hook Capacity 100 tons
Auxiliary Hook Capacity 10 tons
A1.3.7 Tailrace
The turbines release water through elbow type draft tubes into a tailrace excavated in the river
channel. Downstream, Lake Hickory extends to and forms the tailwater of the Rhodhiss Station,
with a full pond level at elevation 935 ft msl.
Table A1.3-5. Rhodhiss Tailrace Features
Feature Description
Type Excavated channel
Length 1,400 ft
Normal Tailwater Elevation 935 ft msl
A1.3.8 Other Structures
One vertical lift structural steel trash gate with frame and screw type hoist has been retired with
the addition of stoplogs to cover the gate opening and the removal of the platform and operating
mechanism. Accessory electrical equipment includes items typical for any hydro station:
A-16

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
generator circuit breakers, control cabinets, relay boards, station service transformers, motor
generator sets, batteries, and the customary protective devices.
A1.3.9 Impoundment
Lake Rhodhiss is downstream of Lake James and is located in Burke and Caldwell Counties,
North Carolina, with approximately 106.8 miles of shoreline. The reservoir was built between
1924 and 1925. Lake Rhodhiss is a long, slender lake with approximately 2,724 acres (full pond
contour 995.1 ft msl).
Table A1.3-6. Rhodhiss Impoundment
Feature Description
Maximum Water Surface
Normal Maximum Water Surface
Normal Minimum Water Surface
Drainage Area
Shoreline Length
Estimated Gross Capacity of Lake Rhodhiss
995.1 ft msl
995.1 ft msl
989.1 ft msl
1,090 sq. mi.
106.8 miles
46,500 ac-ft
A1.3.10 Bypassed Reaches
There are no bypassed reaches associated with the Rhodhiss Development.
A1.3.11 Turbine/Generators
The Rhodhiss powerhouse contains three vertical axis, Francis type turbines that drive
synchronous AC generators. The normal operating gross head with three units generating at peak
efficiency is 60.5 feet. For a corresponding estimated net head of 59 feet including water
conveyance system head losses, the generating units have the following performance:
Turbine Output
Turbine Output
Unit 1
Peak Efficiency
11,700 HP
Unit 3
Peak Efficiency
16,600 HP
A-17

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Turbine Output
Unit 2
Peak Efficiency
14,800 HP
All Units Generator Rating: 12,350 kW @ 0.95 pf; 13,000 kVA
The authorized installed capacity as defined by 18CFR§ 11.1(i) is 32.225 MW.
At full gate and the normal gross head, the three turbines have a maximum hydraulic capacity of
8,325 cfs. The turbine runner for Unit 2 includes hub -venting capability for dissolved oxygen
enhancement.
A digital hydraulic governor controls each turbine through servomotor -operated wicket gates.
The governor receives its speed indication from a speed sensor mounted on the shaft. The
governor oil pressure is supplied by a governor hydraulic package consisting of two 15-HP, AC
motor -driven, positive displacement pumps with a nitrogen gas pressure accumulator. The two
governor motor -pumps are redundant and alternate in lead -lag sequence under normal operation
to equalize load.
Each turbine has two butterfly, Lee type, headgates to provide unit isolation for dewatering and
maintenance. Each headgate has an AC motor to open and close the headgate.
Each turbine is direct connected to a vertical shaft, air-cooled generator. A single Kingsbury
thrust bearing carries the thrust load for both the turbine and generator. The thrust bearing is
located above the generator rotor in the thrust tub on top of the generator bridgetree. Generator
neutrals are grounded through a resistor. The original direct -driven exciters were retired, new
static exciters were connected to the generator field brush assemblies, and constant pressure
brushes were installed.
Plant controls reside in Programmable Logic Controllers (PLCs) located at the station. Local,
manual controls are available at each unit. Control may be exercised from a computer screen in
the plant control room or from the Regulated Renewables Operations Center in Charlotte, NC.
A-18

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.3.12 Primary Transmission Lines in the Project
There is one primary transmission line; a 0.17 mile -long segment of the line leading from the
Rhodhiss Powerhouse switching station to the Rhodhiss Tie Substation.
A1.3.13 Switchyards
A switchyard with lattice type steel structure is located immediately adjacent to the powerhouse.
Step-up transformers, circuit breakers, and other switching equipment are located in this yard.
Three step-up transformers interconnect the powerhouse to the 44 kV transmission system. Each
is rated at 25 MVA, with forced -air cooling, three-phase.
A1.3.14 Federal Lands
There are no federal lands within the Rhodhiss Project Boundaries.
A-19

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
A1.4 Oxford Development
A1.4.1 Overview
The Oxford hydropower facility is located on the Catawba River approximately seven miles
south-southwest of Taylorsville, North Carolina. The principal structures consist of a dam, which
impounds a reservoir known as Lake Hickory, a powerhouse with an integral intake structure, a
gated spillway, and concrete gravity non -overflow structures (bulkheads) at both ends of the
spillway. The powerhouse is located in Catawba County on the right bank of the river, and the
left -bank end of the dam lies in Alexander County (Figure E1.1-4). The dam and powerhouse
were first operational in April 1928.
A1.4.2 Dam
The dam consists of a concrete gravity, gated spillway structure 550 ft long in the river channel; a
concrete intake and powerhouse structure, 111 ft long at the right bank; a concrete gravity
bulkhead structure 285 ft long; and a concrete gravity overflow structure approximately 200 ft
long at the left abutment, which serves as an emergency spillway. The right abutment of the dam
has an earthen embankment approximately 170 ft long with a maximum height of 18 ft and a
crest elevation of 952 ft msl. The total length of dam is approximately1,394 ft.
In 2003, a 9-ft high floodwall was added to the right bulkhead and to the bulkhead directly behind
the powerhouse, increasing the height of the walls to elevation 959 ft msl. Concrete cantilever
walls approximately 125 ft long and a sheet pile wall approximately 55 ft long were also added
along the crest of the earthen embankment at the right bank, raising the crest elevation to 959 ft
A-20

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
msl. In 2003, an emergency spillway was constructed by removing the top 14 ft from the left
bulkhead. The new emergency spillway has a length of 193 ft with a crest elevation of 936 ft
msl. A 279-ft long soil nail wall with a maximum height of 50 ft was constructed along the left
bank to serve as a training wall for flood waters. Post -tensioned anchors were also installed in the
spillway and in the left and right bulkheads to strengthen the structures against extreme flooding
events. To stabilize the powerhouse, a concrete buttress approximately 14 ft by 35 ft by 42 ft
long and anchored with post -tensioned anchors was constructed in the tailrace between units.
Table A1.4-1. Oxford Dam Features
Feature Description
Location Southeasterly end of Lake Hickory; Catawba and
Alexander Counties, NC
Type Rolled earth and concrete gravity
Height 133 ft
Crest Length 1,394 ft
Crest Elevation 959 ft msl maximum, 950 ft msl minimum
Crest Width 20 ft
A1.4.3 Spillways
Spillway crest control consists of 10 Stoney gates 25 ft high by 45 ft clear. The spillway is a
mass -concrete Ogee structure with an overall length of approximately 540 ft. The crest elevation
of the spillway is 910 ft msl and the top of the gates are at 935 ft msl. The maximum height of
the spillway structure to the top of the spillway gate is approximately 120 ft.
Table A1.4-2. Oxford Spillway Features
Feature Description
Type Concrete Ogee overflow
Crest Elevation 910 ft msl Ogee, 935 ft msl top of gates
Length 540 ft
Control Ten Stoney type vertical lift gates, 25 ft high by 45 ft
clear
Gate Hoist Type Gantry, 70 ton, Whiting
A-2 1

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Feature Description
Gate Control Location
Release at Elevation 950 ft msl
Nine gates from the spillway bridge deck, one gate
from control room
354,100 cfs
A1.4.4 Intake
The intake and powerhouse are integral structures constructed from reinforced and mass concrete
sandwiched between the right end of the spillway and the right non -overflow bulkhead. There are
two separate intakes, one for each turbine. Each intake has two sets of structural steel trash racks.
There are a total of four horizontal butterfly Lee type headgates and frames. The headgates are
constructed from cast iron and steel, and are operated by two chains and sprocket type hoists that
are motor operated. Each unit has a 30-inch diameter headgate bypass sluice gate with motor -
driven floor stand operator.
Table A1.4-3. Oxford Intake Features
Feature Description
Type Concrete
Control Four cast iron and steel horizontal butterfly Lee type
Gate Hoist Type Individual vertical lift screw type, motor operated
from line shaft
Number and Size of Openings Six 15.5-ft wide by 21.5 ft high
Trash Rack Bar Size 4 inch wide by 0.375 inch thick
Trash Rack Bar Spacing 4.5 inch
Rack Cleaning None
Bypass Valves Two 30-inch diameter vertical lift sluice gates
A1.4.5 Water Conveyance
The intake and powerhouse structures are an integral part of the dam, without independent
penstocks or flumes.
A1.4.6 Powerhouse
The powerhouse has a reinforced concrete substructure with a steel frame and brick
superstructure, constructed in monoliths for each unit. An erection and service bay is located at
the inshore end. A 105-ton bridge type crane is provided on -site.
A-22

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.4-4. Oxford Powerhouse Features
Feature Description
STRUCTURE
Type Indoor, aboveground powerhouse
Construction Reinforced cast -in -place concrete substructure and
floor
Steel frame with brick walls above generator floor
FEATURES
Turbines Two vertical axis, Francis type
Generators Two vertical shaft, waterwheel type, direct connected
above turbines
CONTROL ROOM
Location Local control room is in a building on the right
abutment
ANCILLARY EQUIPMENT
Overhead Crane Type Traveling Bridge, Whiting
Main Hook Capacity 105 tons
Auxiliary Hook Capacity 30 tons
A1.4.7 Tailrace
Normal tailwater is at an elevation of 845.5 ft msl.
Table A1.4-5. Oxford Tailrace Features
Feature Description
Type Excavated channel
Length 430 ft
Normal Tailwater Elevation 845.5 ft msl
A1.4.8 Other Structures
One structural steel trash gate with frame and screw type hoist by Chapman Valve Manufacturing
Company is included at the structure.
A-23

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Accessory electrical equipment includes items typical for any hydro station: generator circuit
breakers, control cabinets, relay boards, station service transformers, batteries, and the customary
protective devices.
A1.4.9 Impoundment
Lake Hickory lies directly downstream of Lake Rhodhiss and is located in Alexander, Burke,
Caldwell, and Catawba Counties, North Carolina, with approximately 115.7 miles of shoreline.
The reservoir was built in 1927, and covers approximately 4,072 acres (full pond contour 935 ft
msl).
Table A1.4-6. Oxford Impoundment
Feature Description
Maximum Water Surface (Full Pond) 935 ft msl
Normal Maximum Water Surface 935 ft msl
Normal Minimum Water Surface 929 ft msl
Drainage Area 1,310 sq. miles
Shoreline Length 115.7 miles
Estimated Gross Capacity of Lake Hickory 103,300 ac-ft
A1.4.10 Bypassed Reaches
There are no bypassed reaches associated with the Oxford Development.
A1.4.11 Turbine/Generators
The Oxford Powerhouse contains two vertical axis, Francis type turbines with synchronous AC
generators. The normal operating gross head with two units generating at peak efficiency is 88 ft.
For a corresponding estimated net head of 86 ft including water conveyance system head losses,
the generating units have the following performance:
Turbine Output
Turbine Output
Unit 1
Peak Efficiency
23,800 HP
Unit 2
Peak Efficiency
28,200 HP
A-24

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Generator Rating: 18,000 kW @ 0.8 pf; 22,500 kVA
The authorized installed capacity as defined by 18CFR§ 11.1(i) is 35.85 MW.
At full gate and normal head, the two turbines have a maximum hydraulic capacity of 6,755 cfs.
The runners include hub -venting capability that can be used for dissolved oxygen enhancement.
A digital hydraulic governor controls each turbine through servomotor -operated wicket gates.
The governor receives its speed indication from a speed sensor mounted on the turbine shaft. The
governor oil pressure is supplied by a governor hydraulic package consisting of two 15-HP, AC
motor -driven, positive displacement pumps with a nitrogen gas pressure accumulator. The two
governor motor -pumps are redundant and alternate in lead -lag sequence under normal operation
to equalize load.
Each turbine has two butterfly Lee type headgates to provide unit isolation for dewatering and
maintenance. Each headgate has an AC motor to open and close the headgate. A handwheel is
provided for manual operation of each headgate.
Each turbine is direct connected to a vertical shaft, air-cooled generator. A single Kingsbury
thrust bearing carries the thrust load for both the turbine and generator. The thrust bearing is
located above the generator rotor in the thrust tub on top of the generator bridgetree. Generator
neutrals are grounded through a resistor. The original direct -driven exciters are retired, and new
static exciters are connected to the generator field brush assemblies. Constant pressure brushes
are installed.
Plant controls reside in PLCs located at the station. Local, manual controls are available at each
unit. Control may be exercised from a computer screen in the plant control room or from the
Regulated Renewables Operations Center in Charlotte, NC.
A1.4.12 Primary Transmission Lines in the Project
There are no primary transmission lines within the Oxford Project Boundaries.
A-25

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.4.13 Switchyards
A switchyard with lattice type steel structure is located approximately 40 ft from the powerhouse
building. Two phase step-up transformers, circuit breakers, and other switching equipment are
located in this yard. The step-up transformers interconnect the powerhouse to the 100 kV
transmission system. The transformers are rated at 25 MVA, three -phased, forced -air cooled.
A1.4.14 Federal Lands
There are no federal lands within the Oxford Project Boundaries.
A-26

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
A1.5 Lookout Shoals
A1.5.1 Overview
The Lookout Shoals hydropower facility is located on the Catawba River approximately 11 miles
west-southwest of Statesville, North Carolina, and approximately 4 miles north-northwest of
Catawba, North Carolina (Figure E1.1-5). The dam is located on the Catawba River in Catawba
and Iredell Counties, North Carolina. The principal structures of the project include a
powerhouse with an integral intake structure, an ungated mass concrete spillway, concrete gravity
non -overflow bulkheads, and an earthen embankment. The hydropower facility began
commercial operation during or shortly after December 1915.
A1.5.2 Dam
The dam is comprised of the following structures, in order, starting from the right abutment: an
earthen embankment, approximately 1,287 ft long by approximately 88 ft maximum height; a
concrete core wall or gravity bulkhead section 65 ft long; a 933-ft long, uncontrolled concrete
gravity spillway with crest elevation of 838.1 ft msl; a concrete intake and powerhouse structure
194.8 ft long; and a concrete gravity bulkhead structure 270 ft long. The total length of the dam
is approximately 2,731 ft. In July 1916, the west end of the dam and the west (right) abutment
were washed out by a flood. Subsequently, the embankment and core wall section, with a
training and retaining wall downstream from the spillway, was constructed.
Prior to the dam rehabilitation work performed from 1999 to 2000, the shorter (65 ft) right -bank
bulkhead was 1 ft lower than the longer (270 ft) left -bank bulkhead, which is at an elevation of
860.1 ft msl. Dam rehabilitation work raised the elevation of the right bulkhead to elevation 866
A-27

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
ft msl, and added a 112-ft section of floodwall on the left bulkhead with a top elevation of 866.2
ft msl. Additionally, post -tensioned anchors were added to the left and right bulkheads and to the
powerhouse bulkhead to strengthen the structures against extreme flood events.
On the right -bank (west) side of the dam, there is an earthen embankment approximately 1,287 ft
long with a crest elevation of 868.9 ft msl. The maximum height of the dam to the crest of the
spillway is approximately 88 ft.
Table A1.5-1. Lookout Shoals Dam Features
Feature Description
Location Southeasterly end of Lookout Shoals Lake; Catawba
and Iredell Counties, NC
Type Semi -hydraulic fill earth and concrete gravity
Height 88 ft
Crest Length 2,731 ft
Crest Elevation 868.9 ft msl maximum, 838.1 ft msl minimum
Crest Width 10 ft
A1.5.3 Spillways
The spillway is a mass concrete Ogee structure approximately 933 ft long with a crest elevation
of 838.1 ft msl. The original spillway crest was lowered 6 ft after the July 1916 flood.
Table A1.5-2. Lookout Shoals Spillway Features
Feature Description
Type Concrete Ogee overflow
Crest Elevation (Full Pond) 838.1 ft msl
Length 933 ft
Control None
Gate Hoist Type None
Gate Control Location None
Release at Elevation 860.1 ft msl 391,275 cfs
A-28

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.5.4 Intake
The intake and powerhouse are integral structures constructed from reinforced and mass concrete
sandwiched between the left end of the spillway and the left non -overflow bulkhead. There are
four separate intakes, one for each of the three main turbines and a fourth for the two junior
turbines (upgraded exciter intake). Each intake has one set of structural steel trash racks. Three
vertical lift headgates are motor operated by a dual drum cable hoist system. The headgates are
constructed from structural steel trusses and skin plate, and are filled with concrete. Each unit has
a 20-inch diameter headgate bypass sluice gate with floor stand operator. The upgraded exciter
intake has a vertical lift timber headgate.
Table A1.5-3. Lookout Shoals Intake Features
Feature Description
Type Concrete
Control Three concrete -filled, steel reinforced vertical lift
gates
One timber vertical lift gate
Gate Hoist Type Drum and cable vertical lift type, motor operated from
line shaft
Geared rack
Number and Size of Openings Three 18-ft wide by 22 ft high
One 7-ft wide by 14 ft high
Trash Rack Bar Size 6 inch wide by 0.375 inch thick
Trash Rack Bar Spacing 4.125 inch
Rack Cleaning None
Bypass Valves Three 20-inch diameter vertical lift cast-iron sluice
gate
A1.5.5 Water Conveyance
The intake and powerhouse structures are an integral part of the dam, without independent
penstocks or flumes. The turbines release through elbow type draft tubes into a tailrace excavated
in the river channel The two junior turbines release through steel funnel draft tubes.
A-29

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.5.6 Powerhouse
The powerhouse has a reinforced concrete substructure with a steel frame and brick
superstructure. The powerhouse is on the east, or Iredell County, side of the river. The
powerhouse is an integral part of the left -bank bulkhead. A 60-ton bridge type crane is provided
on -site.
Table A1.5-4. Lookout Shoals Powerhouse Features
Feature Description
STRUCTURE
Type Indoor, aboveground powerhouse
Construction Reinforced cast -in -place concrete substructure and
floor
Steel frame with brick walls above generator floor
Large Turbines Three vertical axis, Francis type
Small Turbines Two vertical axis, Francis type
Large Generators Three vertical shaft, waterwheel type, direct connected
above turbines
Small Generators Two vertical shaft, waterwheel type, direct connected
above turbines
CONTROL ROOM
Location Local control room is in the left end of the
powerhouse
ANCILLARY EQUIPMENT
Overhead Crane Type Traveling Bridge, Whiting
Main Hook Capacity 60 tons
Auxiliary Hook Capacity 30 tons
A1.5.7 Tailrace
Impounded by the Cowans Ford Dam, Lake Norman forms the tailwater of the Lookout Shoals
facility at its normal full pond level at elevation 760 ft msl.
A-30

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.5-5. Lookout Shoals Tailrace Features
Feature Description
Type Excavated channel
Length 550 ft
Normal Tailwater Elevation 760 ft msl
A1.5.8 Other Structures
Accessory electrical equipment includes items typical for any hydro station: generator circuit
breakers, control cabinets, relay boards, station service transformers, batteries, and the customary
protective devices. Station auxiliary power feeds from not only the typical station service
transformers, but also two small 480 V, 500 kVA auxiliary generators.
A1.5.9 Impoundment
Lookout Shoals Lake lies directly downstream of Lake Hickory and is located in Alexander,
Catawba, and Iredell Counties, North Carolina, with approximately 35.2 miles of shoreline. The
reservoir was built in 1915 and covers approximately 1,155 acres (full pond contour 838.1 ft msl).
Table A1.5-6. Lookout Shoals Impoundment
Feature Description
Maximum Water Surface (Full Pond) 838.1 ft msl
Normal Maximum Water Surface 838.1 ft msl
Normal Minimum Water Surface 834.6 ft msl
Drainage Area 1,450 sq. mi.
Shoreline Length 35.2 miles
Estimated Gross Capacity of 25,000 ac-ft
Lookout Shoals Lake
A1.5.10 Bypassed Reaches
There are no bypassed reaches associated with the Lookout Shoals Development.
A1.5.11 Turbine/Generators
The Lookout Powerhouse contains three main vertical axis, Francis type turbines, and two
smaller vertical axis, Francis type turbines, all with synchronous AC generators. The smaller
units are auxiliary AC generators resulting from the conversion of the turbine -driven DC
A-3 1

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
generators previously used to provide generator excitation for the main generators. A static
excitation system was installed to provide generator excitation for the three main generators. The
normal operating gross head with three units generating at peak efficiency is 74.5 ft. For a
corresponding estimated net head of 73 ft including water conveyance system head losses, the
generating units have the following performance:
Turbine Output
Turbine Output
Units 1-3
Peak Efficiency
8.235 MW
Auxiliary Units A & B
Peak Efficiency
0.37 MW
Main Generator Rating: 8,970 kW @ 1.0 pf; 8,970 kVA
Auxiliary Generator Rating: 450 kW @ 0.9 pf; 500 kVA
The authorized installed capacity as defined by 18CFR§ 11.1(i) is 25.715 MW.
At full gate and the normal operating gross head, the five turbines have a combined maximum
hydraulic capacity of 5,304 cfs.
A digital hydraulic governor controls each turbine through servomotor -operated wicket gates.
The governor receives its speed indication from a speed sensor mounted on the turbine shaft. The
governor oil pressure is supplied by a governor hydraulic package consisting of two 15-HP, AC
motor -driven, positive displacement pumps with a nitrogen gas pressure accumulator. The two
governor motor -pumps are redundant and alternate in lead -lag sequence under normal operation
to equalize load.
Each turbine has one headgate to provide unit isolation for dewatering and maintenance. One AC
motor drives the line shaft for all the headgates. Each headgate has a drive system that is
connected to the line shaft by clutches. A handwheel is provided for manual operation of each
headgate. The two auxiliary turbines have electric motor -operated (EMO) control valves to
isolate the units. A handwheel is provided on each EMO operator for manual operation.
A-32

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Each turbine is direct connected to a vertical shaft, air-cooled generator. A single Kingsbury
thrust bearing carries the thrust load for both the turbine and generator. The thrust bearing is
located above the generator rotor in the thrust tub on top of the generator bridgetree. Generator
neutrals are grounded through a resistor. The original exciters were converted to small generating
units. New static exciters are connected to the generator field brush assemblies. Constant
pressure brushes are installed.
Plant controls reside in PLCs located at the station. Local, manual controls are available at each
unit. Control may be exercised from a computer screen in the plant control room or from the
Regulated Renewables Operations Center in Charlotte, NC.
A1.5.12 Primary Transmission Lines in the Project
A 0.2-mile-long, 100 kV transmission line leads to the Lookout Tie Substation.
A1.5.13 Switchyards
An outdoor switchyard with lattice type steel structures is located approximately 130 ft from the
powerhouse building. Step-up transformers, circuit breakers, and other switching equipment are
located in this yard. Two step-up transformers interconnect the powerhouse to the 100 kV
transmission systems. Each is rated at 22.4 MVA, with forced oil and air-cooling, three-phase.
A1.5.14 Federal Lands
There are no federal lands within the Lookout Shoals Project Boundaries.
A-33

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
A1.6 Cowans Ford Development
w
A1.6.1 Overview
The Cowans Ford hydroelectric facility consists of a dam that impounds a reservoir known as
Lake Norman and is located on the Catawba River approximately 16 miles northwest of
Charlotte, North Carolina, and approximately seven miles west-northwest of Huntersville, North
Carolina (Figure E1.1-6). The dam is built across the Catawba River in Lincoln and
Mecklenburg Counties, North Carolina. The powerhouse is on the west, or Lincoln County, side
of the river. The hydropower facility began commercial operation in September 1963.
A1.6.2 Dams
The principal structures of the dam include a powerhouse with an integral intake structure, a
gated spillway, bulkheads, earthen embankments at the end of the bulkheads, and a saddle dam
(Hicks Cross Roads Dike) located across a low feature on the reservoir rim.
The bulkheads are concrete gravity non -overflow structures with a top elevation of 770 ft msl.
The right -bank bulkhead is 276 ft long and the left -bank bulkhead is approximately 210 ft long.
Dam rehabilitation work performed in 2000 installed 5-ft high floodwalls, raising the elevation of
the bulkheads to elevation 775 ft msl. Post -tensioned anchors were also installed in the right
bulkhead to strengthen it against extreme flooding events.
Earthen embankments are located at each end of the dam and are connected to each bulkhead.
Approximately 1,765 ft of the left bank (east) embankment has a crest elevation of 775 ft msl.
The remaining easternmost 1,770 ft of the embankment has an elevation of 780 ft msl. The right -
bank (west) embankment is 3,924 ft long and has a crest elevation of 775 ft msl.
A-34

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
The Hicks Cross Roads Dike is approximately 3,139 ft long and has a crest elevation of 775 ft
msl. The upstream slopes of all embankments are covered by riprap. The crest and downstream
slopes are covered with grass.
Table A1.6-1. Cowans Ford Dam Features
Feature Description
Location South end of Lake Norman; Lincoln and Mecklenburg
Counties, NC
Type Rolled earth and concrete gravity
Height 130 ft
Crest Length 8,738 ft
Crest Elevation 780 ft msl maximum, 770 ft msl minimum
Crest Width 20 ft
A1.6.3 Spillway
The spillway is a mass concrete Ogee structure with 11 Tainter gates and an overall length of
approximately 465 ft. The crest elevation of the spillway is 732 ft msl and the elevation of the
top of the closed gates is 760 ft msl. The maximum height of the dam to the spillway crest is
approximately 92 ft. Post -tensioned anchors were added in 2000 to strengthen the spillway
structure against extreme flood events.
Table A1.6-2. Cowans Ford Spillway Features
Feature Description
Type Concrete Ogee overflow
Crest Elevation 732 ft msl Ogee, 760 ft msl top of Tainter gate
Length 465 ft
Control Eleven Tainter gates, 28 ft high by 35 ft wide
Gate Hoist Type Two 55-ton trolley type chain hoists
Gate Control Location Spillway bridge deck, elevation 770 ft msl
Release at Elevation 770 ft msl 277,130 cfs
A1.6.4 Intake
The intake and powerhouse are integral structures constructed from reinforced and mass concrete
sandwiched between the right end of the spillway and the right non -overflow bulkhead. Four
A-35

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
separate intakes supply water to the turbines to produce electricity. Each intake consists of three
sets of trash racks and head gates. An 80-ton gantry type traveling hoist is provided for gate
operation.
Table A1.6-3. Cowans Ford Intake Features
Feature
Description
Type
Control
Gate Hoist Type
Number and Size of Openings
Trash Rack Bar Size
Trash Rack Bar Spacing
Rack Cleaning
Stop Logs
Bypass Valves
Concrete
One structural steel vertical slide gate with rollers per
unit
Two structural steel vertical slide gates per unit
300-ton gantry type, American Hoist & Derrick
Twelve 17.7-ft wide by 49 ft high (3 per unit)
4 inch wide by 0.50 inch thick with round edges
9 inch
None
Two sets of structural steel vertical slide gates
Four 24-inch diameter vertical lift cast iron sluice
gates
A1.6.5 Water Conveyance
The substructure of the powerhouse is an integral part of the dam. No independent penstocks or
flumes are required. The turbines release through elbow type draft tubes into a tailrace channel.
A1.6.6 Powerhouse
The powerhouse consists of a concrete substructure that is an integral part of the intake structure
and spillway. The powerhouse is constructed from reinforced concrete, 328 ft long, at the right
abutment. An operating gallery is provided beneath the generator floor and immediately
downstream from the units. An electrically operated 300-ton gantry type traveling crane is
provided for erection and dismantling of the units. Governors, unit control boards, and related
equipment are located between the units, facing the operating gallery. Low-tension switchgear is
housed beneath the generator floor and immediately downstream from the operating gallery. This
enclosure contains the main control room. An erection and service bay was constructed at the
inshore end of the unit structures.
A-36

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.6-4. Cowans Ford Powerhouse Features
Feature Description
STRUCTURE
Type Indoor, belowground powerhouse
Construction Reinforced cast -in -place concrete substructure and
floor
FEATURES
Turbines Twoadjustable blade and two fixed blade propeller,
Kaplan type
Generators Four vertical shaft, waterwheel type, direct connected
above turbines
CONTROL ROOM
Location Local control room is in the powerhouse
ANCILLARY EQUIPMENT
Overhead Crane Type
Main Hook Capacity
Gantry type, American Hoist & Derrick
300 tons
A1.6.7 Tailrace
Mountain Island Lake extends to and forms the tailwater of the station. Normal tailwater
elevation is 645 ft msl.
Table A1.6-5. Cowans Ford Tailrace Features
Feature Description
Type Excavated channel
Length 810 ft
Normal Tailwater Elevation 645 ft msl
A1.6.8 Other Structures
A stop log arrangement is provided for closing off the spillway opening for painting and repair of
the gates.
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Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Structural steel sliding type draft tube gates are provided for closing off any one of the draft tubes
against tailwater. A 30-ton gantry crane on the draft tube deck operates these gates.
A cellular cofferdam arrangement is provided upstream of the intake structure. A total of five
cells, 49.8 ft in diameter, make up the left end of an underwater weir system with crest elevation
of 725 ft msl. A rolled earth dike makes up the remainder of the weir and forms the abutment
with the west embankment.
A1.6.9 Impoundment
Lake Norman lies directly downstream of Lookout Shoals Lake and is located in Mecklenburg,
Iredell, Catawba, and Lincoln Counties, North Carolina. The reservoir was completed in 1963
and covers approximately 32,339 acres (full pond contour 760 ft msl) with approximately 603.1
mi of shoreline. The Licensee has three power plants on Lake Norman, including Cowans Ford
Hydroelectric Station, which was completed in 1967. Marshall Steam Station and McGuire
Nuclear Station are also located on Lake Norman.
Table A1.6-6. Cowans Ford Impoundment
Feature Description
Maximum Water Surface (Full Pond) 760 ft msl
Normal Maximum Water Surface 760 ft msl
Normal Minimum Water Surface 751 ft msl
Drainage Area 1,790 sq. miles
Shoreline Length 603.1 miles
Estimated Gross Capacity of Lake Norman 1,093,600 ac-ft
A1.6.10 Bypassed Reaches
There are no bypassed reaches associated with the Cowans Ford Development.
A1.6.11 Turbine/Generators
The Cowans Ford Powerhouse contains four vertical axis, Kaplan type turbines with synchronous
AC generators, two of which are adjustable blade and two of which are fixed blade. The normal
operating gross head with four units generating at peak efficiency is 108 feet. For a
corresponding estimated net head of 106 ft including water conveyance system head losses, the
generating units have the following performance:
A-3 8

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Turbine Output
Peak Efficiency
120,000 HP
Generator Rating: 83,125 kW @ 0.95 pf; 87,500 kVA
The authorized installed capacity as defined by 18CFR§ 11.1(i) is 332.5 MW. At maximum
power and the normal operating gross head of 108 ft, the four turbines have a maximum hydraulic
capacity of 54,400 cfs.
Cabinet type governors with standard auxiliaries and controls are provided at the site. Each
turbine is direct connected to a vertical shaft, air-cooled generator. Exciters are direct connected
to each generator. The customary auxiliaries, controls, and protective devices are provided at the
site. Generator neutrals are grounded through a resistor. Unit 2 is equipped with a static
excitation system.
Plant controls reside in Programmable Logic Controllers (PLCs) located at the station. Local,
manual controls are available at each unit. Control may be exercised from a computer screen in
the plant control room or from the Regulated Renewables Operations Center in Charlotte, NC.
A1.6.12 Primary Transmission Lines in the Project
A 1.67-mile-long, 230—kV transmission line leads from the Cowans Ford Powerhouse to the
McGuire Switching Station.
A1.6.13 Switchyards
There is no switchyard located at this development. Two transformers interconnect the plant with
the 230 kV transmission systems. Both are located on top of the powerhouse. Transformer Bank
1, which connects Units 1 and 2 to the transmission system is rated at 225 MVA, with forced oil
and forced air-cooling, three-phase.
A1.6.14 Federal Lands
There are no federal lands within the Cowans Ford Project Boundaries.
A-39

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
A1.7 Mountain Island Development
A1.7.1 Overview
The Mountain Island Development is located on the Catawba River approximately 11 miles
northwest of Charlotte, North Carolina, and approximately 3 miles north-northeast of Mount
Holly, North Carolina (Figure E1.1-7). The principal structures of the Mountain Island
hydropower facility include a powerhouse with an integral intake structure, an uncontrolled
spillway, two bulkheads, and an earthen embankment. The powerhouse is located in Gaston
County on the right (west) bank of the river and the left bank (east) end of the dam lies in
Mecklenburg County. The hydropower facility began commercial operation in December 1923.
A1.7.2 Dam
The dam consists of the following structures, in order, starting from the right abutment: an
earthen embankment with a crest elevation of 674.5 ft msl constructed by the semi -hydraulic fill
method, approximately 670 ft long by approximately 140 ft maximum height, with a concrete
core wall 75 ft long; a concrete gravity bulkhead section 200 ft long; a concrete intake and
powerhouse structure 246 ft long; a concrete gravity bulkhead section 259 ft long; and a concrete
gravity spillway structure approximately 997 ft long. The total length of dam is approximately
2,375- ft.
A compacted earthfill counterweight stability berm is being constructed along the downstream
slope of the existing embankment to improve seismic performance of the structure. The stability
berm will have a minimum embankment crest elevation of 673.0 ft amsl (NGVD29) with a
A-40

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
downstream slope of 2.5H:1 V from the crest to a bench at approximate elevation 621 feet that
serves as the access road to the powerhouse. The bench has a minimum width of approximately
30 feet and widens to a maximum of 60 feet from west to east along the length of the bench.
Below this bench the design slope of the berm will be 2.5H:1V for the majority of the slope,
steepening to 2.0H:1 V near the cyclopean retaining wall structure south of the powerhouse. This
design extends the existing footprint of the embankment approximately 150 feet south.
The crest of the embankment dam prior to modification is approximately 20 feet wide at an
elevation that ranges between 672 feet msl and 674.5 ft msl. Modifications to the embankment
dam includes raising the elevation of the majority of the crest and construction of a drainage
feature that separates the original crest and crest of the buttress berm. After construction of the
earthen buttress berm, the elevation of the crest will range between 677 ft msl and 673 ft msl and
the effective crest width (i.e., original crest width plus crest width of buttress berm) of the
embankment dam will be 120 feet.
A 6-ft floodwall was added to the 259 ft, left (east) bulkhead in 1998 to increase the height of the
wall to approximately 668.5 ft msl.
Table A1.7-1. Mountain Island Dam Features
Feature Description
Location Southeasterly end of Mountain Island Lake;
Mecklenburg and Gaston Counties, NC
Type Semi -hydraulic fill earth and concrete gravity
Height 140 ft
Crest Length 2,375 ft
Crest Elevation 677 ft msl maximum, 673 ft msl minimum
Crest Width 120 ft
A1.7.3 Spillway
The spillway is a mass concrete Ogee structure approximately 997 ft long with a crest elevation
of 647.5 ft msl. The spillway has no crest control. The maximum height of the dam to the crest
of the spillway is approximately 97 ft.
A-4 1

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.7-2. Mountain Island Spillway Features
Feature Description
Type
Crest Elevation
Length
Control
Gate Hoist Type
Gate Control Location
Release at Elevation 667.5 ft msl
Concrete Ogee overflow
647.5 ft msl
997 ft
Ungated
None
None
373,785 cfs
A1.7.4 Intake
The intake and powerhouse are integral structures constructed from reinforced and mass concrete
sandwiched between the right end of the spillway and the right non -overflow bulkhead. There are
four separate intakes, one for each turbine. Each intake has two sets of structural steel trash
racks. There are a total of eight horizontal butterfly Lee type headgates and frames. The
headgates are constructed from cast iron and steel, and are operated by eight vertical screw type
stems that are motor operated. Each unit has a 24-inch diameter headgate bypass sluice gate with
manual floor stand operator.
Table A1.7-3. Mountain Island Intake Features
Feature
Description
Type
Control
Gate Hoist Type
Number and Size of Openings
Trash Rack Bar Size
Trash Rack Bar Spacing
Rack Cleaning
Bypass Valves
Concrete
Eight cast iron and steel horizontal butterfly Lee type
Individual vertical lift screw type, motor operated
from line shaft
Eight 15.5-ft wide by 21.5 ft high
6 inch wide by 0.375 inch thick
4.5 inch
None
Four 30-inch diameter vertical lift cast iron sluice
gates
A-42

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.7.5 Water Conveyance
The intake and powerhouse structures are an integral part of the dam without independent
penstocks or flumes.
A1.7.6 Powerhouse
The powerhouse has a reinforced concrete substructure with a steel frame and brick
superstructure, constructed in monoliths for each unit. The superstructure consists of brick walls
with steel trusses supporting the roof. A 100-ton bridge type crane is provided on -site.
Table A1.7-4. Mountain Island Powerhouse Features
Feature Description
STRUCTURE
Type Indoor, aboveground powerhouse
Construction Reinforced cast -in -place concrete substructure and
floor
Steel frame with brick walls above generator floor
FEATURES
Turbines Four vertical axis, Francis type
Generators Four vertical shaft, waterwheel type, direct connected
above turbines
CONTROL ROOM
Location Local control room is in the powerhouse
ANCILLARY EQUIPMENT
Overhead Crane Type Traveling Bridge, Niles
Main Hook Capacity 100 tons
Auxiliary Hook Capacity 10 tons
A1.7.7 Tailrace
The turbines release water through elbow type draft tubes into a tailrace channel. The tailrace
was constructed by widening and deepening a secondary channel of the river. It rejoins the main
A-43

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
channel approximately 2,500 ft below the powerhouse. Lake Wylie downstream, with normal
full pond level at elevation 569.4 ft msl, extends to the station and forms its tailwater.
Table A1.7-5. Mountain Island Tailrace Features
Feature Description
Type Excavated Channel
Length 2,500 ft
Normal Tailwater Elevation 569.4 ft msl
A1.7.8 Other Structures
One trash gate constructed from structural steel with frame and motor -driven hoist is included.
Accessory electrical equipment includes items typical for any hydro station: generator circuit
breakers, control panels, relay boards, station service transformers, batteries, and the customary
protective devices.
A1.7.9 Impoundment
Mountain Island Lake lies directly downstream of the Cowans Ford Development and is located
in Mecklenburg, Lincoln, and Gaston Counties, North Carolina. The reservoir was completed in
1924, and covers approximately 3,117 acres (full pond contour 647.5 ft msl) with approximately
96.5 mi of shoreline.
Table A1.7-6. Mountain Island Impoundment
Feature Description
Maximum Water Surface (Full Pond) 647.5 ft msl
Normal Maximum Water Surface 647.5 ft msl
Normal Minimum Water Surface 641.8 ft msl
Drainage Area 1,860 sq. miles
Shoreline Length 96.5 miles
Estimated Gross Capacity 57,300 ac-ft
of Mountain Island Lake
A1.7.10 Bypassed Reaches
There is a 0.7-mile bypassed reach associated with the Mountain Island Development below the
spillway.
A-44

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.7.11 Turbine/Generators
The Mountain Island Powerhouse contains four vertical axis, Francis type turbines with
synchronous AC generators. The normal operating gross head with four units generating at peak
efficiency is 76 ft. For a corresponding estimated net head of 75 ft including water conveyance
system head losses, the generating units have the following performance:
Turbine Output
Units 1 and 2
Peak Efficiency
21,873 HP
Generator Rating: 15,000 kW @ 0.8 pf; 18,750 kVA
Turbine Output
Units 3 and 4
Peak Efficiency
20,760 HP
Generator Rating: 15,000 kW @ 0.8 pf; 18,750 kVA
The authorized installed capacity as defined by 18CFR§ 11.1(i) is 60 MW.
At full gate and the normal operating gross head of 76 ft, the four turbines have a maximum
hydraulic capacity of 12,130 cfs.
Each turbine is direct connected to a vertical shaft, air-cooled generator. A single Kingsbury
thrust bearing carries the thrust load for both the turbine and generator. The thrust bearing is
located above the generator rotor in the thrust tub on top of the generator bridgetree.
Each turbine is complete with actuator type governors and accessory equipment. Exciters are
direct connected to each generator. The customary auxiliaries, controls, and protective devices
are provided. Generator neutrals are grounded through a resistor.
A-45

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Plant controls reside in Programmable Logic Controllers (PLCs) located at the station. Local,
manual controls are available at each unit. Control may be exercised from a computer screen in
the plant control room or from the Regulated Renewables Operations Center in Charlotte, NC.
A1.7.12 Primary Transmission Lines in the Project
There are no primary transmission lines within the Mountain Island Project Boundaries.
A1.7.13 Switchyards
Two step-up transformers are located within a switchyard adjacent to the powerhouse. Each step-
up transformer serves as an interconnect to the 44 kV transmission system for two Mountain
Island generators. Each transformer is three-phase, 40 MVA, with forced -air cooling.
A1.7.14 Federal Lands
There are no federal lands within the Mountain Island Project Boundaries.
A-46

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
A1.8 Wylie Development
A1.8.1 Overview
The Wylie hydroelectric facility is located on the Catawba River in York County, South Carolina,
approximately 17 miles southwest of Charlotte, North Carolina, and approximately 3 miles west
of Fort Mill, South Carolina (Figure E1.1-8). The original " Catawba Station" began operation
in 1904. In 1924 and 1925, the dam was raised approximately 49.5 ft, new structures were added,
the old power plant was dismantled, and the structures were incorporated into the new Wylie
Dam. The principal structures of the Wylie hydropower facility include a powerhouse with an
integral intake structure, a spillway with gated and ungated sections, bulkheads, and an earthen
embankment. The Wylie Plant began operation in August 1925.
A1.8.2 Dam
The dam is comprised of the following structures, in order, starting from the right abutment: a
rolled -fill earthen embankment approximately 1,595 ft long, a concrete gravity bulkhead section
315 ft long, a concrete gravity spillway section 793 ft long at the crest, a concrete intake and
powerhouse section 271.8 ft long, and a concrete gravity bulkhead section approximately 190 ft
long.
The mass concrete bulkheads on each side of the dam have a crest elevation of 584.5 ft msl (right
bank) and 584.6 ft msl (left bank). The earthen embankment has a crest elevation of 589.4 ft msl.
The maximum height of the dam, from the foundation of the dam to the crest of the uncontrolled
A-47

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
spillway, is approximately 119 ft. The total length of dam along the crest is approximately 3,165
ft.
From 2003 to 2004, post -tensioned anchors were installed in the gated spillway sections and the
right and left bulkheads to stabilize the structures against probable maximum flood events. To
stabilize the powerhouse, three concrete buttresses were constructed in the tailrace between units
and anchored with post -tensioned anchors.
Table A1.8-1. Wylie Dam Features
Feature Description
Location South end of Lake Wylie; York County, SC
Type Rolled -fill earthen embankment and concrete gravity
Height 119 ft
Crest Length 3,165 ft
Crest Elevation 589.4 ft msl maximum, 584.4 ft msl minimum
Crest Width 20 ft
A1.8.3 Spillways
The spillway is a mass concrete Ogee structure with two controlled sections separated by a
curved, uncontrolled section. The uncontrolled section is approximately 157 ft long, with a crest
elevation of 569.4 ft msl. The two -gated sections of the spillway have a crest elevation of 539.4
ft msl, with the section on the right bank (south) approximately 320 ft long with six floodgates
and a trash gate. The section on the left bank is approximately 265 ft long and has five
floodgates. Each floodgate is 30 ft high by 45 ft clear. The gates are operated by two motor -
driven vertical lift screw type traveling hoists. The hoists travel on a structural steel runway
supported by lattice steel towers on each gate pier. The trash gate located next to the right
bulkhead has been retired.
Table A1.8-2. Wylie Spillway Features
Feature Description
Type Concrete Ogee overflow
Crest Elevation 539.4 ft msl, gated; 569.4 ft msl, Ogee
Length 793 ft
A-48

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Feature Description
Control Eleven steel, Stoney type floodgates, 30 ft high by 45
ft clear
Gate Hoist Type Two 84-ton gantry cranes with two vertical lift screw
stems
Gate Control Location Spillway access walkway
Release at Elevation 584.4 ft msl 544,660 cfs
A1.8.4 Intake
The intake and powerhouse are integral structures constructed from reinforced and mass concrete
sandwiched between the left end of the spillway and the left non -overflow bulkhead. There are
four separate intakes, one for each turbine. Each intake has two sets of structural steel trash
racks. There are a total of eight horizontal butterfly Lee type headgates and frames. The
headgates are constructed from cast iron and steel and operated by eight vertical screw type stems
that are motor operated. Each unit has a 30-inch diameter headgate bypass sluice gate with
motor -driven floor stand operator.
Table A1.8-3. Wylie Intake Features
Feature Description
Type
Control
Concrete
Eight horizontal butterfly Lee type (two per unit)
Gate Hoist Type Eight motor -driven, vertical lift, screw type, with
crosshead and connecting bar.
Number and Size of Openings Eight 17.7-ft wide by 24.8 ft high
Trash Rack Bar Size 4 inch wide by 0.562 inch thick
Trash Rack Bar Spacing 3.5 inch
Rack Cleaning None
Bypass Valves Four 30-inch diameter vertical lift cast iron sluice
gates
A1.8.5 Water Conveyance
The intake and powerhouse structures are an integral part of the dam, without independent
penstocks or flumes.
A-49

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.8.6 Powerhouse
The powerhouse is located on the left (north) bank of the river. The powerhouse consists of a
concrete substructure, which is an integral part of the intake structure and spillway. The
superstructure consists of brick walls with steel trusses supporting the roof. An erection and
service bay is located at the inshore end. There is a separate warehouse and shop building located
on the left bank downstream of the powerhouse. A 100-ton bridge type crane is provided on -site.
Table A1.8-4. Wylie Powerhouse Features
Feature Description
STRUCTURE
Type Indoor, aboveground powerhouse
Construction Reinforced cast -in -place concrete substructure and
floor
Steel frame with brick walls above generator floor
FEATURES
Turbines Four vertical axis, Francis type
Generators Four vertical shaft, waterwheel type, direct connected
above turbines
CONTROL ROOM
Location Local control room is in the left end of the
powerhouse
ANCILLARY EQUIPMENT
Overhead Crane Type Traveling Bridge, Whiting
Main Hook Capacity 100 tons
Auxiliary Hook Capacity 30 tons
A1.8.7 Tailrace
The turbines release water through elbow type draft tubes into a tailrace excavated in the river
channel. Normal tailwater elevation is at 499.4 ft msl.
A-50

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.8-5. Wylie Tailrace Features
Feature Description
Type Excavated channel
Length 800 ft
Normal Tailwater Elevation 499.4 ft msl
A1.8.8 Other Structures
One trash gate is located at the right end of the flood gate structure with an opening 25 ft high by
17.4 ft clear. This gate has been retired. Another trash gate is located at the left end of the intake
structure, constructed from structural steel with frame and motor -driven screw type hoist. This
gate has been retired.
Accessory electrical equipment includes items typical for any hydro station: generator circuit
breakers, control cabinets, relay boards, station service transformers, batteries, and the customary
protective devices.
A1.8.9 Impoundment
Lake Wylie, the oldest lake of the Catawba-Wateree Project is located directly downstream of
Mountain Island Lake. The lake is located in Gaston and Mecklenburg Counties, North Carolina;
and York County, South Carolina. The total shoreline length for Lake Wylie is approximately
348.5 mi, with a surface area of approximately 12,177 acres (full pond contour 569.4 ft msl). The
Licensee has three power plants on Lake Wylie, including Wylie Hydro Station, Allen Steam
Station, and the Catawba Nuclear Station.
Table A1.8-6. Wylie Impoundment
Feature Description
Maximum Water Surface (Full Pond) 569.4 ft msl
Normal Maximum Water Surface 569.4 ft msl
Normal Minimum Water Surface 563.4 ft msl
Drainage Area 3,020 sq. miles
Shoreline Length 348.5 miles
Estimated Gross Capacity of Lake Wylie 229,200 ac-ft
A-5 1

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.8.10 Bypassed Reaches
There are no bypassed reaches associated with the Wylie Development.
A1.8.11 Turbine/Generators
The Wylie Powerhouse contains four vertical axis, Francis type turbines with synchronous AC
generators. As authorized by the new license issued on November 25, 2015, Unit 4 was
commissioned in September 2020 with a replacement aerating runner and is operated as a
minimum flow unit.
The normal operating gross head with four units generating at peak efficiency is 68.5 feet. For a
corresponding estimated net head of 67.0 ft including water conveyance system head losses, the
generating units have the following performance:
Peak Efficiency
Turbine Output (Units 1-3): 23,000 HP
Turbine Output (Unit 4): 8,167 HP
Generator Rating (Units 1-4): 18,000 kW @ 0.9 pf; 20,000 kVA
The rated head for Unit 4 is 70.7 ft, which is a function of lower tailwater level when the main
Units (1-3) are not operating.
The authorized installed capacity as defined by 18CFR§ 11.1(i) is 57.875 MW.
At full gate opening and the normal operating gross head, the four turbines have an estimated
maximum hydraulic capacity of 12,376 cfs (3,794 cfs for each Units 1-3 and 1,270 for Unit 4).
The runners for Units 2 and 3 include hub -venting capability for dissolved oxygen enhancement.
A digital hydraulic governor controls each turbine through servomotor -operated wicket gates.
The governor receives its speed indication from a gear -driven speed sensor mounted on the shaft.
The governor oil pressure is supplied by a governor hydraulic package consisting of two 15-HP,
AC motor -driven, positive displacement pumps with a nitrogen gas pressure accumulator. The
two governor motor -pumps are redundant and alternate in lead -lag sequence under normal
operation to equalize load.
A-52

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Each turbine has two butterfly Lee type headgates to provide unit isolation for dewatering and
maintenance. Each headgate has an AC motor to open and close the headgate. A handwheel is
provided for manual operation.
Each turbine is direct connected to a vertical shaft, air-cooled generator. A single Kingsbury
thrust bearing carries the thrust load for both the turbine and generator. The thrust bearing is
located above the generator rotor in the thrust tub on top of the generator bridgetree. Generator
neutrals are grounded through a resistor. The original direct -driven exciters are retired. New
static exciters are connected to the generator field brush assemblies. Constant pressure brushes
are installed.
Plant controls reside in PLCs located at the station. Local, manual controls are available at each
unit. Control may be exercised from a computer screen in the plant control room or from the
Regulated Renewables Operations Center in Charlotte, NC.
A1.8.12 Primary Transmission Lines in the Project
There are no primary transmission lines within the Wylie Project Boundaries.
A1.8.13 Switchyards
Step-up transformers and necessary switching equipment are located in an outdoor switchyard
immediately inshore from and adjacent to the powerhouse building. Four step-up transformers
interconnect the powerhouse to the 44 kV transmission system. Each is rated at 22.4 MVA, with
forced air-cooling, three-phase. Each transformer' s 44 kV circuit breaker is located on the hill
adjacent to the powerhouse switchyard.
A1.8.14 Federal Lands
There are no federal lands within the Wylie Project Boundaries.
A-53

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
A1.9 Fishing Creek Development
A1.9.1 Overview
The Fishing Creek Hydro Development is located on the Catawba River approximately 11 miles
southwest of Lancaster, South Carolina, and less than 2 miles north-northeast of the Town of
Great Falls, South Carolina (Figure E1.1-9). The principal structures of the Fishing Creek
hydropower facility include a powerhouse with an integral intake structure, a gated spillway, an
overflow spillway, and a bulkhead. The powerhouse is located on the right (west) bank of the
river in Chester County while the left -bank (east) end of the dam lies in Lancaster County. The
hydropower facility began commercial operation in late 1916. In 1927, the head on the plant was
increased 15 ft by the installation of floodgates. At that time, the east end of the spillway was
rebuilt.
A1.9.2 Dam
The dam is comprised of the following structures, in order, starting from the right abutment: a
concrete gravity bulkhead structure approximately 214 ft long; a concrete intake and powerhouse
structure 250 ft long; a concrete gravity, gated spillway 1,200 ft long; and a concrete gravity,
overflow spillway structure approximately 120 ft long with its crest level with the top of gates.
The total length of dam is approximately 1,770 ft.
A-54

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.9-1. Fishing Creek Dam Features
Feature Description
Location South end of Fishing Creek Reservoir; Chester and
Lancaster Counties, SC
Type Concrete gravity
Height 97 ft
Crest Length 1,770 ft
Crest Elevation 429.2 ft msl maximum, 425.2 ft msl minimum
A1.9.3 Spillways
The controlled spillway is a mass concrete Ogee structure with 22 Stoney gates and an overall
length of approximately 1,210 ft. One gate has been retired, leaving twenty-one operational
gates. The gates are operated by two motor -driven vertical lift screw type traveling hoists. The
hoists travel on a structural steel runway supported by lattice steel towers on each gate pier. The
crest elevation of the gated spillway is 392.2 ft msl and the top of the gates is at 417.2 ft msl. The
uncontrolled spillway located at the left end of the dam is also a mass concrete Ogee structure
with a length of approximately 114 ft and a crest elevation of 417.2 ft msl. The maximum height
of the dam from the foundation of the dam to the crest of the uncontrolled spillway is
approximately 97 ft. Remedial work necessitated by erosion at the spillway toe was done in
1938.
Table A1.9-2. Fishing Creek Spillway Features
Feature Description
Type Concrete Ogee overflow
Crest Elevation 392.2 ft msl Ogee, 417.2 ft msl top of gates
Length 1,210 ft
Control Twenty-one steel, Stoney type floodgates, 25
ft high by 45 ft clear
Gate Hoist Type Two motor -driven, vertical lift, screw type,
traveling on a structural steel runway
supported by steel towers on the gate piers
Gate Control Location Spillway access walkway
Release at Elevation 428.2 ft msl 837,650 cfs
A-55

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.9.4 Intake
The intake and powerhouse are integral structures constructed from reinforced and mass concrete
sandwiched between the right end of the spillway and the right non -overflow bulkhead. There are
five separate intakes, one for each of the turbines. Each intake has one set of structural steel trash
racks. Five vertical lift headgates are motor operated by a dual drum cable hoist system. The
headgates are constructed from structural steel trusses and skin plate, and are filled with concrete.
Each unit has an inclined 12 inch by 24 inch headgate bypass sluice gates with floor stand
operator.
Table A1.9-3. Fishing Creek Intake Features
Feature
Description
Type
Control
Gate Hoist Type
Number and Size of Openings
Trash Rack Bar Size
Trash Rack Bar Spacing
Rack Cleaning
Bypass Valves
Concrete Ogee overflow
Five concrete -filled, steel reinforced vertical lift gates
Drum and cable vertical lift type, motor operated from
line shaft
Three 26-ft wide by 20 ft high
6 inch wide by 0.375 inch thick
4.125 inch
None
Five inclined 12 inch wide by 24 inch high headgate
bypass sluice gates
A1.9.5 Water Conveyance
The intake and powerhouse structures are an integral part of the dam, without independent intakes
or flumes.
A1.9.6 Powerhouse
The powerhouse has a reinforced concrete substructure with a steel frame and brick
superstructure. After the July 1916 flood, the powerhouse bulkhead was raised 10 ft, the
basement floor was filled with concrete, and the downstream wall of the powerhouse substructure
was reinforced. An 80-ton bridge type crane is provided on -site. The powerhouse is on the west,
or Chester County, side of the river.
A-56

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.9-4. Fishing Creek Powerhouse Features
Feature Description
STRUCTURE
Type Indoor, aboveground powerhouse
Construction Reinforced cast -in -place concrete substructure and
floor
Steel frame with brick walls above generator floor
FEATURES
Turbines Five vertical axis, Francis type
Generators Five vertical shaft, waterwheel type, direct connected
above turbines
CONTROL ROOM
Location Local control room is in the right end of the
powerhouse
ANCILLARY EQUIPMENT
Overhead Crane Type Traveling Bridge, Whiting
Main Hook Capacity 80 tons
Auxiliary Hook Capacity 30 tons
A1.9.7 Tailrace
The turbines release water through elbow type draft tubes directly into the river channel. The
Great Falls Reservoir downstream, with normal reservoir level at elevation 355.8 ft msl, extends
to the plant and forms the tailwater.
Table A1.9-5. Fishing Creek Tailrace Features
Feature Description
Type Excavated channel
Length 270 ft
Normal Tailwater Elevation 355.8 ft msl
A-57

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.9.8 Other Structures
Accessory electrical equipment includes items typical for any hydro station: generator circuit
breakers, control cabinets, relay boards, station service transformers, batteries, and the customary
protective devices.
A1.9.9 Impoundment
Fishing Creek Reservoir is located in Lancaster and Chester Counties, South Carolina. Its
headwaters lie approximately 25 mi below Wylie Dam, and it has approximately 85.1 mi of
shoreline and covers approximately 3,431 acres (full pond contour 417.2 ft msl). Fishing Creek
Reservoir was completed in 1916.
Table A1.9-6. Fishing Creek Impoundment
Feature Description
Maximum Water Surface 417.2 ft
Normal Maximum Water Surface 417.2 ft
Normal Minimum Water Surface 412.2 ft
Drainage Area 3,810 sq. miles
Shoreline Length 85.1 miles
Estimated Gross Capacity of Fishing Creek Reservoir 48,800 ac-ft
Contrary to the name of the facility, the drainage basin of the reservoir does not include Fishing
Creek, which passes to the west of the dam.
A1.9.10 Bypassed Reaches
There are no bypassed reaches associated with the Fishing Creek Development.
A1.9.11 Turbine/Generators
The Fishing Creek Powerhouse contains five vertical axis, Francis type turbines with
synchronous AC generators. The normal operating gross head with all five units generating at
peak efficiency is 61.0 feet. For a corresponding estimated net head of 59.0 ft including water
conveyance system head losses, the generating units have the following performance:
A-58

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Turbine Output
Turbine Output
Turbine Output
Units 1 & 4
Peak Efficiency
14,500 HP
Units 2 & 3
Peak Efficiency
12,440 HP
Unit 5
Peak Efficiency
11,200 HP
Units 1 & 4 Generator Rating: 10,530 kW @ 0.9 pf; 11,700 kVA
Units 2, 3 & 5 Generator Rating: 9,450 kW @ 0.9 pf; 10,500 kVA
The authorized installed capacity as defined by 18CFR§ 11.1(i) is 48.12 MW.
At full gate and the normal operating gross head, the five turbines have an estimated maximum
hydraulic capacity of 12,208 cfs. A summary of major turbine/generator characteristics is
provided in the table below.
A digital hydraulic governor controls each turbine through servomotor -operated wicket gates.
The governor receives its speed indication from a speed sensor mounted on the turbine shaft. The
governor oil pressure is supplied by a governor hydraulic package consisting of two 15-HP, AC
motor -driven, positive displacement pumps with a nitrogen gas pressure accumulator. The two
governor motor -pumps are redundant and alternate in lead -lag sequence under normal operation
to equalize load.
Each turbine has one headgate to provide unit isolation for dewatering and maintenance. One AC
motor drives the line shaft for all the headgates. Each headgate has a drive system that is
connected to the line shaft by clutches. A handwheel is provided for manual operation of each
headgate.
A-59

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Each turbine is direct connected to a vertical shaft, air-cooled generator. A single Kingsbury
thrust bearing carries the thrust load for both the turbine and generator. The thrust bearing is
located above the generator rotor in the thrust tub on top of the generator bridgetree. Generator
neutrals are grounded through a resistor. The original direct -driven exciters are retired. New
static exciters are connected to the generator field brush assemblies. Constant pressure brushes
are installed.
Plant controls reside in PLCs located at the station. Local, manual controls are available at each
unit. Control may be exercised from a computer screen in the plant control room or remotely
from the Regulated Renewables Operations Center in Charlotte, NC.
A1.9.12 Primary Transmission Lines in the Project
There are no primary transmission lines within the Fishing Creek Project Boundaries.
A1.9.13 Switchyards
The step-up transformers, circuit breakers, and other switching equipment are located in an
outdoor switchyard on the abutment hillside approximately 100 ft downstream from the
powerhouse building. Two step-up transformers interconnect the powerhouse to the 100 kV
transmission system. One is rated at 37.3 MVA, with forced -air cooling, three-phase. The other
is rated at 25 MVA with forced -air cooling, three phase.
A1.9.14 Federal Lands
There are no federal lands within the Fishing Creek Project Boundaries.
A-60

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
A1.10 Great Falls -Dearborn Development
A1.10.1 Overview
The Great Falls -Dearborn hydroelectric facilities are located in Chester County, South Carolina, 3
miles downstream of the Fishing Creek hydropower facility on a reach of the Catawba River
characterized by a bifurcation in the river channel (Figure E1.1-9). The hydropower facilities
began commercial operation in April 1907 and March 1923, respectively.
A1.10.2 Dams
The Great Falls -Dearborn Dam, supplied with water from the Great Falls Reservoir via a canal
from the headworks, consists of two powerhouses with separate intake structures and bulkheads.
The bulkheads are mass concrete, non -overflow structures. The Great Falls Powerhouse
bulkhead, approximately 675 ft long, extends the full width of the canal and ties into the west
abutment (right bank of canal) and the Dearborn Powerhouse. The Dearborn Powerhouse
bulkhead, which ties into the east abutment (left bank of canal), is approximately 160 ft long.
The top elevation of the bulkheads is at elevation 365.9 ft msl. The maximum height of the dam
is 103 ft. The only flows from the Great Falls -Dearborn Dam consist of turbine releases.
A-61

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.10-1. Great Falls -Dearborn Dam Features
Feature Description
Location South end of Great Falls Reservoir; Chester County, SC
Type Concrete gravity
Height 103 ft
Crest Elevation 365.9 ft msl
A1.10.3 Spillways
The Mountain Island Diversion Spillway is located approximately 1,500 ft downstream of the
Fishing Creek Dam. The diversion spillway is 1,500 ft long with a crest elevation of 355.8 ft msl.
It diverts the flow of the Catawba River to a canal parallel to and west of the original Catawba
River channel.
The canal headworks, located 1.4 mi upstream of the Great Falls and Dearborn P owerhouses,
mark the boundary between the Great Falls Reservoir and the canal that feeds water to the Great
Falls and Dearborn Powerhouses. The headworks include a trash rack structure for the canal
intake and two mass concrete overflow spillways. The main spillway is upstream of the
headworks and the canal spillway is immediately downstream of the headworks. The canal
spillway is equipped with flashboards, and the elevation of the top of the flashboards, 355.8 ft
msl, is the same elevation as the crest of the main spillway. Flow into the canal leading to the
powerhouses is regulated by submerged openings in the canal intake structure. Floodwater is
released to the Catawba River by these two spillways and the upstream diversion spillway.
Table A1.10-2. Great Falls -Dearborn Spillway Features
Feature Description
Type Concrete Ogee overflow
CREST ELEVATION
Great Falls Diversion 355.8 ft msl
Main Spillway 355.8 ft msl
Canal Spillway 351.8 ft msl, Ogee; 355.8 ft msl, top of
flashing
LENGTH
Great Falls Diversion 1,500 ft
A-62

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Main Spillway
Canal Spillway
Control
Gate Hoist Type
Gate Control Location
Release at Elevation 365.8 ft msl
443 ft
540 ft
Wood flashing at canal spillway
None
None
335,846 cfs
A1.10.4 Intakes
The Great Falls intake and bulkhead are integral structures constructed from reinforced and mass
concrete. There are nine separate intakes; one for each turbine, and one for the exciter unit. Each
intake has a set of structural steel trash racks. The intakes are lined with riveted steel plates that
form the water chest surrounding the twin horizontal runners.
Table A1.10-3. Great Falls Intake Features
Feature
Description
Type
Control
Gate Hoist Type
Number and Size of Openings
Trash Rack Bar Size
Trash Rack Bar Spacing
Rack Cleaning
Bypass Valves
Concrete with riveted steel lining
Structural steel reinforced vertical lift gates; eight for the
turbines, and one for the exciter
Individual vertical lift rack gear type, motor operated from
line shaft
Eight 16-ft wide by 18.5 ft high oval
One 6-ft wide by 9 ft high oval
4 inch wide by 0.375 inch thick
2.4 inch
None
Nine 9-inch wide by 12 in high vertical lift steel gates
The Dearborn intake and powerhouse are integral structures constructed from reinforced and
mass concrete sandwiched between the left end of the spillway and the left non -overflow
bulkhead. There are three separate intakes, one for each turbine. Each intake has two sets of
structural steel trash racks. There are a total of six horizontal butterfly Lee type headgates and
frames. The headgates are constructed from cast iron and steel, and are operated by six vertical
screw type stems that are motor operated. Each unit has a 24-inch diameter headgate bypass
sluice gate with a manual floor stand operator.
A-63

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.10-4. Dearborn Intake Features
Feature
Description
Type
Gate Hoist Type
Number and Size of Openings
Trash Rack Bar Size
Trash Rack Bar Spacing
Rack Cleaning
Bypass Valves
Six horizontal butterfly Lee type
Individual vertical lift screw type, motor operated
Six 15.5-ft wide by 21.5 ft high
4 inch wide by 0.375 inch thick
3 inch
None
Three 24-inch diameter vertical lift cast iron sluice
gates
A1.10.5 Water Conveyance
A forebay canal approximately 7,250 ft long extends from the canal headworks to the intake
structures of the two powerhouses. The canal was formed by improvement of existing
topography between the canal headworks and the powerhouses. The improvements include an
earth fill (saddle dike) in a low area along the canal' s eastern rim, approximately 1,300 feet
downstream of the canal spillway. The saddle dike is approximately 450 feet long with a
maximum height of approximately 50 feet. The remainder of the canal is retained by natural
topography. The Dearborn Station was constructed on the east bank, downstream from and at a
45° angle with the Great Falls Powerhouse. In order to construct it, an auxiliary forebay
approximately 80 ft wide at the bottom was excavated around the east end of the Great Falls
Powerhouse headworks.
For both stations, the scroll case intakes are an integral part of the powerhouse structure, without
independent penstocks or flumes. Both intakes have racks and headgates.
A1.10.6 Powerhouse
The principal structure of the Great Falls Powerhouse is a concrete gravity intake structure,
closing off the forebay canal. Its maximum height is approximately 87 ft. It was originally
approximately 745 ft long at the crest, but approximately 68 ft was removed from the east end for
construction of the Dearborn Station. It contains the scroll case inlets, the turbine casings, and
the draft tubes, all with plate steel liners. The generators are carried by concrete arch construction
over the upper end of the tailrace. The powerhouse superstructure is of wall bearing, brick
A-64

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
construction, with steel roof trusses. Exposed concrete is faced with stone masonry. A 30-ton
bridge type crane is provided.
Table A1.10-5. Great Falls Powerhouse Features
Feature Description
STRUCTURE
Type Indoor, above ground powerhouse
Construction Reinforced cast -in -place concrete substructure and
floor
Steel frame with brick walls above generator floor
FEATURES
Turbines Eight horizontal shaft, twin runner, Francis type
Generators Eight horizontal shaft, waterwheel type, direct
connected
CONTROL ROOM
Location Local control room is in the powerhouse
ANCILLARY EQUIPMENT
Overhead Crane Type
Main Hook Capacity
Traveling Bridge, Whiting
30 tons
The Dearborn Powerhouse structures consist of a concrete gravity bulkhead structure 48.5 ft long,
tying into the intake structure of the Great Falls Powerhouse; a concrete intake and powerhouse
structure 161 ft long; and a concrete gravity bulkhead structure 160 ft long, tying into the hillside.
The powerhouse superstructure is of steel frame and brick construction. A 100-ton bridge type
crane is provided.
Table A1.10-6. Dearborn Powerhouse Features
Feature Description
STRUCTURE
Type
Indoor, aboveground powerhouse
A-65

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Feature Description
Construction
Reinforced cast -in -place concrete substructure and
floor
Steel frame with brick walls above generator floor
FEATURES
Turbines Three vertical axis, Francis type
Generators Three vertical shaft, waterwheel type, direct
connected above turbines
CONTROL ROOM
Location Local control room is in the right end of the
powerhouse
ANCILLARY EQUIPMENT
Overhead Crane Type Traveling Bridge, Whiting
Main Hook Capacity 100 tons
Auxiliary Hook Capacity 30 tons
A1.10.7 Tailrace
For both stations, the turbines release water through elbow type draft tubes into an excavated
tailrace. The Cedar Creek Reservoir downstream, with a normal full pond elevation of 284.4 ft
msl, extends to the Station and forms its tailwater.
Table A1.10-7. Great Falls Tailrace Features
Feature Description
Type Excavated channel
Length 1,600 ft
Normal Tailwater Elevation 284.4 ft msl
Table A1.10-8. Dearborn Tailrace Features
Feature Description
Type Excavated channel
Length 400 ft
Normal Tailwater Elevation 284.4 ft msl
A-66

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.10.8 Other Structures
A structural steel trash gate with frame and screw type hoist is located at the right end of the
Dearborn bulkhead.
Accessory electrical equipment includes items typical for any hydro station: generator circuit
breakers, control cabinets, relay boards, station service transformers, batteries, and the customary
protective devices.
A1.10.9 Impoundment
The Great Falls Reservoir is located downstream of the Fishing Creek Reservoir, in Chester and
Lancaster Counties, South Carolina. With approximately 13.1 mi of shoreline, the reservoir
covers approximately 353 acres (full pond contour 355.8 ft msl). The Great Falls Reservoir was
completed in 1907.
Table A1.10-9. Great Falls -Dearborn Impoundment
Feature Description
Maximum Water Surface 355.8 ft msl
Normal Maximum Water Surface 355.8 ft msl
Normal Minimum Water Surface 350.8 ft msl
Drainage Area 4,100 sq. miles
Shoreline Length 13.1 miles
Estimated Gross Capacity of Great Falls -Dearborn
Reservoir 1,700 ac-ft
A1.10.10 Bypassed Reaches
There are two bypassed reaches associated with the Great Falls -Dearborn Development. The
Great Falls Long Bypassed Reach (Great Falls Diversion Dam side) is approximately 2.25 miles
long, and runs along the east side of Mountain Island. The Great Falls Short Bypassed Reach
(Great Falls Headworks) is approximately 0.75 mile long, and runs along the west side of
Mountain Island.
A-67

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.10.11 Turbine/Generators
Great Falls Turbine/Generator
The Great Falls Powerhouse originally contained eight horizontal -axis, Francis type turbines with
synchronous AC generators. The New License issued November 25, 2015 required Duke Energy
to decommission Units 3,4,7, and 8 which will remain in the powerhouse post -decommissioning
due to their historic significance. Decommissioning was completed on Units 3, 4, 7, and 8 in June
2020. These units have been dewatered by closing the headgates and placing concrete in the
intake conveyance passages up to the top of the scroll cases.
The normal operating gross head with units at Great Falls generating at peak efficiency is 71.0 ft.
For a corresponding estimated net head of 69.0 ft including water conveyance system head losses,
the generating units have the following performance:
Units 1 & 2
Peak Efficiency
Turbine Output 5,200 HP
Turbine Output
Turbine Output
Unit 6,
Peak Efficiency
4,360 HP
Unit 5
Peak Efficiency
5,060 HP
Units 1 through 8 Generator Rating: 3,000 kW @ 0.8 pf; 3,750 kVA
The authorized installed capacity as defined by 18CFR§ 11.1(i) is 12.0 MW.
At full gate and the maximum normal operating gross head of 71 ft, the four main turbines have
an estimated maximum hydraulic capacity of 3,314 cfs. Each turbine is direct connected to a
horizontal shaft, air-cooled generator.
A-68

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Dearborn Turbine/Generator
The Dearborn Powerhouse contains three vertical -axis, Francis type turbines with synchronous
AC generators. The normal operating gross head with units at Dearborn generating at peak
efficiency is 71.0 feet. For a corresponding estimated net head of 69.0 ft including water
conveyance system head losses, the generating units have the following performance:
Turbine Output
Peak Efficiency
18,667 HP
Generator Rating: 15,000 kW @ 0.8 pf; 18,750 kVA
The authorized installed capacity as defined by 18 CFR§ 11.1(i) is 42.0 MW.
At full gate and the normal operating gross head of 71 ft, the three turbines have a maximum
hydraulic capacity of 9,111 cfs.
A digital hydraulic governor controls each turbine through servomotor -operated wicket gates.
The governor receives its speed indication from a permanent magnet generator mounted on the
turbine shaft. The governor oil pressure is supplied by an AC motor -driven, positive
displacement pump.
Each turbine has two butterfly Lee type headgates to provide unit isolation for dewatering and
maintenance. Each headgate has an AC motor to open and close the headgate. A handwheel is
provided for manual operation of each headgate.
Each turbine is direct connected to a vertical shaft, air-cooled generator. A single Kingsbury
thrust bearing carries the thrust load for both the turbine and generator. The thrust bearing is
located above the generator rotor in the thrust tub on top of the generator bridgetree. Generator
neutrals are grounded through a resistor.
Plant controls reside in PLCs located at the station. Local, manual controls are available at each
unit. Control may be exercised from a computer screen in the plant control room or remotely
from the Regulated Renewables Operations Center in Charlotte, NC.
A-69

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.10.12 Primary Transmission Lines in the Project
A 0.13-mile-long 100-kV transmission line and a 0.8-mile long 44-kV transmission line leading
to the Great Falls Switching Station. Two 0.2-mile-long, 44-kV transmission lines leading to the
to the Great Falls Switching Station.
A1.10.13 Switchyards
Four step-up transformers for the Great Falls Powerhouse with switching devices are housed in a
building constructed over the tailrace just downstream from the main generator room. The
construction is similar to that described above for the main powerhouse. Each of the four
transformers is rated at 9.33 MVA, with convection air cooling, three-phase. Power is conducted
overhead to an outdoor 44 kV switching station on the west bank of the tailrace and
approximately 200 ft downstream from the powerhouse. The switching station is a part of the
system transmission system.
Step-up transformers for Dearborn Unit 1 are located on a deck at generator floor level and
immediately downstream from the generator room. The Unit 1 transformer bank consists of two
parallel 44 kV transformers, each rated at 10 MVA, with forced -air cooling, three-phase. A single
100 kV step-up transformer for the combined output of Units 2 and 3 is located immediately east
of the powerhouse. This three-phase transformer is rated at 41.67 MVA, with forced air. Power
is conducted overhead at high voltage to the outdoor switching station located on the west bank,
described above.
A1.10.14 Federal Lands
There are no federal lands within the Great Falls -Dearborn Project Boundaries.
A-70

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
A1.11 Rocky Creek -Cedar Creek Development
akiws-
A1.11.1 Overview
The Rocky Creek -Cedar Creek hydropower facilities are located approximately 2 miles southeast
of the Town of Great Falls, South Carolina, at the confluence of Rocky Creek with the Catawba
River. The confluence marks the end of a bifurcation in the Catawba River that begins 1,500 ft
downstream of the Fishing Creek Dam. The Rocky Creek Powerhouse lies on the right (west)
bank of the river in Fairfield County, South Carolina, while the Cedar Creek powerhouse lies on
the left (east) bank of the river in Lancaster County, South Carolina (Figure E1.1-9).
The Rocky Creek hydropower facility started commercial operation shortly after April 1909,
while the Cedar Creek hydropower facility started commercial operation in August 1926.
A1.11.2 Dams
The original Rocky Creek Dam consisted of a concrete gravity overflow spillway 1,025 ft long in
the river channel; a forebay canal perpendicular to the main dam on the west bank, 60 ft wide at
the bottom and approximately 500 ft long; a concrete gravity overflow spillway 213 ft long at the
upper end of the forebay canal; and a concrete gravity bulkhead section approximately 450 ft
long, forming the remainder of the river wall for the forebay canal and the intake structure for the
powerhouse. The top of the powerhouse bulkhead was raised 5 ft after the July 1916 flood.
A-71

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
The Cedar Creek Station was built in 1926 by removing 160 ft of the original dam at the east
bank, excavating a 250-ft long forebay canal perpendicular to the old dam, and constructing new
spillway structures and a new powerhouse. At that time, 14-inch high flashboards were removed
and the crest of the original spillway raised 3 ft to its present elevation of 284.4 ft msl.
The Rocky Creek intake, powerhouse, and bulkhead are at elevation 306.4 ft msl, while the Cedar
Creek Powerhouse intake deck is 4 ft lower at elevation 302.4 ft msl. The maximum height of the
dam is approximately 69 ft. The Cedar Creek Powerhouse and bulkhead are at elevation 308.4 ft
msl. During 2002 dam rehabilitation work, floodwalls were added, raising the top elevation to
313.6 ft msl.
Table A1.11-1. Rocky Creek -Cedar Creek Dam Features
Feature Description
Location South end of Cedar Creek Reservoir; Fairfield
and Lancaster Counties, SC
Type Concrete gravity
Height 69 ft
Crest Elevation 313.6 ft msl maximum, 302.4 ft msl minimum
A1.11.3 Spillways
The U-shaped spillway consists of a concrete gravity overflow spillway 808 ft long, bounded by a
130 ft section of concrete gravity overflow spillway on the east end and a 213-ft long concrete
gravity overflow spillway on the west end. Additionally, the east side of the spillway, which
forms the forebay canal to the Cedar Creek intake, is fitted with two Stoney type floodgates, 25 ft
high by 45 ft clear width. The spillway crest is at elevation 284.4 ft msl and the top of the
floodgates is at elevation 286.1 ft msl. Post -tensioned anchors were installed in the spillway
during the dam rehabilitation work performed in 2002 to strengthen the spillway against extreme
flood events.
Table A1.11-2. Rocky Creek -Cedar Creek Spillway Features
Feature Description
Type
Crest Elevation
Concrete Ogee overflow
284.4 ft msl, Ogee, 259.4 ft msl gated Ogee
A-72

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Feature
Description
Length
Control
Gate Hoist Type
Gate Control Location
Release at Elevation 306.4 ft msl
1,154 ft Ogee
Two Stoney type gates, 25 ft high by 45 ft wide
One motor -driven, vertical lift, screw type, traveling
hoist on structural steel runway supported by steel
towers on the gate piers
Spillway gate access walkway
567,700 cfs
A1.11.4 Intake
The intakes at each powerhouse are fed by forebay canals formed by the east and west sides of
the U-shaped spillway. The Rocky Creek intake and bulkhead are integral structures constructed
from reinforced and mass concrete. There are nine separate intakes; one for each turbine, and one
for the exciter unit. Each intake has a set of structural steel trash racks. The intakes are lined
with riveted steel plates that form the water chest surrounding the twin horizontal runners.
Table A1.11-3. Rocky Creek Intake Features
Feature
Description
Type
Control
Gate Hoist Type
Number and Size of Openings
Trash Rack Bar Size
Trash Rack Bar Spacing
Rack Cleaning
Bypass Valves
Concrete with riveted steel lining
Timber vertical lift gates; eight for the turbines, and one
for the exciter
Individual vertical lift rack gear type, motor operated
from line shaft
Eight 18-ft wide by 21.5 ft high oval
One 6-ft wide by 9 ft high oval
4 inch wide by 0.375 inch thick
2.375 inch
Gantry with hydraulic rake arm
Nine 9-inch wide by 12 inch high vertical lift steel gates
The Cedar Creek intake and powerhouse are integral structures constructed from reinforced and
mass concrete sandwiched between the left end of the spillway and the left non -overflow
bulkhead. There are three separate intakes, one for each turbine. Each intake has two sets of
structural steel trash racks. There are a total of six horizontal butterfly Lee type headgates and
A-73

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
frames. The headgates are constructed from cast iron and steel, and are operated by six vertical
screw type stems that are motor operated. Each unit has a 30-in diameter headgate bypass sluice
gates with manual floor stand operator.
Table A1.11-4. Cedar Creek Intake Features
Feature Description
Type Six horizontal butterfly Lee type
Gate Hoist Type Individual vertical lift screw type, motor operated
Number and Size of Openings Six 17.8-ft wide by 24.8 ft high
Trash Rack Bar Size 4 inch wide by 0.375 inch thick
Trash Rack Bar Spacing 4.5 inches
Rack Cleaning None
Bypass Valves Three 30-inch diameter vertical lift cast iron sluice gate
A1.11.5 Water Conveyance
The intake and powerhouse structures are an integral part of the dams, without independent
penstocks or flumes. The turbines release through elbow type draft tubes into a tailrace excavated
in the river channel.
A1.11.6 Powerhouses
The principal structure of the Rocky Creek Powerhouse is a concrete gravity intake structure,
closing off the intake canal. It contains the scroll case inlets, the turbine casings, and the draft
tubes, all with plate steel liners. The generators are carried by concrete arch construction over the
upper end of the tailrace. The powerhouse superstructure is of wall bearing, brick construction
with steel roof trusses. A 30-ton bridge type crane is provided.
Table A1.11-5. Rocky Creek Powerhouse Features
Feature Description
STRUCTURE
Type Indoor, aboveground powerhouse
Construction Reinforced cast -in -place concrete substructure and
floor
Steel frame with brick walls above generator floor
A-74

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Feature Description
FEATURES
Turbines Eight horizontal shaft, twin runner, Francis type
Generators Eight horizontal shaft, waterwheel type, direct
connected
CONTROL ROOM
Location Local control room is in the powerhouse
ANCILLARY EQUIPMENT
Overhead Crane Type
Main Hook Capacity
Traveling Bridge, Whiting
30 tons
The Cedar Creek Powerhouse has a reinforced concrete substructure with a steel frame and brick
superstructure. A 100-ton bridge type crane is provided on -site.
Table A1.11-6. Cedar Creek Powerhouse Features
Feature Description
STRUCTURE
Type Indoor, aboveground powerhouse
Construction Reinforced cast -in -place concrete substructure and
floor
Steel frame with brick walls above generator floor
FEATURES
Turbines Three vertical axis, Francis type
Generators Three vertical shaft, waterwheel type, direct
connected above turbines
CONTROL ROOM
Location Local control room is in the left end of the
powerhouse
ANCILLARY EQUIPMENT
Overhead Crane Type Traveling Bridge, Whiting
A-75

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Feature Description
Main Hook Capacity 100 tons
Auxiliary Hook Capacity 30 tons
A1.11.7 Tailrace
Lake Wateree downstream, with normal full pond at elevation 225.5 ft msl, extends to the stations
and forms their tailwater.
Table A1.11-7. Cedar Creek Tailrace Features
Feature Description
Type Excavated channel
Length 480 ft
Normal Tailwater Elevation 225.5 ft msl
A1.11.8 Other Structures
Rocky Creek has a 20-inch diameter sluice gate bypass with motor -operated screw type lift.
Accessory electrical equipment includes that typical for any hydro station: generator circuit
breakers, control cabinets, relay boards, station service transformers, and the customary
protective devices. Cedar Creek has a structural steel trash gate with frame and screw type hoist.
A1.11.9 Impoundment
The Cedar Creek Reservoir is located downstream of the Great Falls Reservoir, in Chester,
Lancaster, and Fairfield Counties, South Carolina. With approximately 23.2 mi of shoreline, the
Cedar Creek Reservoir covers approximately 748 acres (full pond contour 284.4 ft msl). The
Cedar Creek Reservoir was completed in 1909.
Table A1.11-8. Cedar Creek Impoundment
Feature Description
Maximum Water Surface (Full Pond) 284.4 ft msl
Normal Maximum Water Surface 284.4 ft msl
Normal Minimum Water Surface 280.4 ft msl
Drainage Area 4,360 sq. miles
Shoreline Length 23.2 miles
A-76

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Estimated Gross Capacity of Cedar
Creek Reservoir 7,900 ac-ft
A1.11.10 Bypassed Reaches
There are no bypassed reaches associated with the Rocky Creek -Cedar Creek Development.
A1.11.11 Turbine/Generators
Rocky Creek Turbine/Generators
The Rocky Creek Powerhouse originally contained eight horizontal -axis, twin -runner, and
Francis type turbines with synchronous AC generators. The New License issued November 25,
2015 required Duke Energy to decommission Units 1, 2, 3, and 4 which will remain in the
powerhouse post -decommissioning due to their historic significance. The decommissioning plan
subsequently approved by FERC on June 15, 2017 authorized the decommissioning of all eight
units within the Rocky Creek Powerhouse. This work is currently underway.
The normal operating gross head with units at Rocky Creek generating at peak efficiency is 60.0
ft. For a corresponding estimated net head of 58.0 ft including water conveyance system head
losses, the generating units have the following performance:
Units 7 & 8
Peak Efficiency
Turbine Output 4,187 HP
Turbine Output
Units 5 & 6
Peak Efficiency
5,200 HP
Units 7 & 8 Generator Rating: 3,000 kW @ 1 pf; 3,000 kVA
Units 5 & 6 Generator Rating: 4,500 kW @ 0.9 pf; 5,000 kVA
The authorized installed capacity as defined by 18CFR§ 11.1(i) is 13.8 MW.
At full gate and normal gross head, the four main turbines have a maximum hydraulic capacity of
3,808 cfs. Each turbine is direct connected to a horizontal shaft, air-cooled generator. Each
generator has a static excitation system powered from the generator side of the switchgear.
A-77

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Cedar Creek Turbine/Generators
The Cedar Creek Powerhouse contains three vertical axis, Francis type turbines with synchronous
AC generators. The normal operating gross head with units at Cedar Creek generating at peak
efficiency is 60.0 ft. For a corresponding estimated net head of 58.0 ft including water
conveyance system head losses, the generating units have the following performance:
Turbine Output
Units 1, 2 & 3
Peak Efficiency
19,100 HP
Unit 1 Generator Rating: 15,000 kW @ 0.8 pf; 18,750 kVA
Units 2 & 3 Generator Rating: 18,000 kW @ 0.9 pf; 20,000 kVA
The authorized installed capacity as defined by 18CFR§ 11.1(i) is 42.975 MW. At full gate and
the normal operating gross head, the three turbines have an estimated maximum hydraulic
capacity of 10,716 cfs. The runners for Units 2 and 3 include hub -venting capability for
dissolved oxygen enhancement.
A digital hydraulic governor controls each turbine through servomotor -operated wicket gates.
The governor receives its speed indication from a speed sensor mounted on the turbine shaft. The
governor oil pressure is supplied by a governor hydraulic package consisting of two 15-HP, AC
motor -driven, positive displacement pumps with a nitrogen gas pressure accumulator. The two
governor motor -pumps are redundant and alternate in lead -lag sequence under normal operation
to equalize load.
Each turbine has two butterfly Lee type headgates to provide unit isolation for dewatering and
maintenance. Each headgate has an AC motor to open and close the headgate. A handwheel is
provided for manual operation of each headgate.
Each turbine is direct connected to a vertical shaft, air-cooled generator. A single Kingsbury
thrust bearing carries the thrust load for both the turbine and generator. The thrust bearing is
located above the generator rotor in the thrust tub on top of the generator bridgetree. Generator
neutrals are grounded through a resistor.
A-78

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Plant controls reside in PLCs located at the station. Local, manual controls are available at each
unit. Control may be exercised from a computer screen in the plant control room or remotely
from the Regulated Renewables Operations Center in Charlotte, NC.
A1.11.12 Primary Transmission Lines in the Project
Two 2.0-mile long, 100-kV transmission lines extending from the switching station at the Cedar
Creek Powerhouse to the Great Falls switching station.
A1.11.13 Switchyards
Four step-up transformers for the Rocky Creek Powerhouse, with switching devices, are used to
feed power into the 44-kV transmission systems. Housed in a building constructed over the
tailrace just downstream from the main generator room, each transformer is rated at 10 MVA,
with forced -air cooling, three-phase.
Cedar Creek is served by a switchyard with lattice type -steel structure, located immediately
adjacent to its powerhouse. Step-up transformers, circuit breakers, and other switching
equipment are located in this yard. Three step-up transformers interconnect the powerhouse to
the 100 kV transmission system, each rated at 25 MVA, with forced -air, three-phase.
A1.11.14 Federal Lands
There are no federal lands within the Rocky Creek -Cedar Creek Project Boundaries.
A-79

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
A1.12 Wateree Development
A1.12.1 Overview
The Wateree hydropower facility's principal structures include a powerhouse with an integral
intake structure, an uncontrolled spillway, a bulkhead, and an earthen embankment approximately
1,175 ft long having a crest elevation of 257.5 ft msl. In 2002, a rolled earth fill buttress was
constructed on the downstream side of the earthen embankment up to elevation 230 ft msl. This
buttress provides strengthening for seismic loading conditions. The Wateree hydroelectric
facility is located on the Wateree River in Kershaw County, South Carolina, approximately 8
miles northwest of Camden, South Carolina, and approximately 28 miles northeast of Columbia,
South Carolina (Figure E1.1-10). The hydropower facility began commercial operation in
October 1919.
A1.12.2 Dam
The bulkhead is a concrete gravity non -overflow structure approximately 390 ft long with a top
elevation of 249.5 ft msl, tying the powerhouse with the earthen embankment on the west (right)
bank of the river. In 2001, a floodwall was added on the bulkhead, raising the top elevation to
approximately 254 ft msl. The maximum height of the dam is approximately 76 ft.
A-80

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.12-1. Wateree Dam Features
Feature Description
Location
Type
Height
Crest Length
Crest Elevation
Crest Width
Southern end of Lake Wateree; Kershaw County, SC
Semi -hydraulic fill earth and concrete gravity
76 ft
1,753 ft
257.5 ft msl maximum, 254 ft msl minimum
10 ft
A1.12.3 Spillways
The spillway is a mass concrete Ogee structure that is tied into the rock abutment at the east bank
and the powerhouse on the west bank. The spillway has a crest elevation of 225.5 ft msl and is
approximately 1,450 ft long, including a 450-ft-long gated section. The gated section comprises
three bottom -hinged, 4.5-ft-high steel gates raised and lowered by inflatable bladders, with each
150-ft-long span able to be operated independently. The controls, compressors, and other
associated mechanical and controls equipment are housed in the powerhouse adjacent to Unit 5.
Table A1.12-2. Wateree Spillway Features
Feature
Description
Type
Fixed Crest Elevation
Length (Total)
Length (Gated)
Control
Top of Gate Elevation
Crest Elevation with Gates Lowered
Top of Gate Piers
Gate Hoist Type
Gate Control Location
Release at Maximum Water Elevation
Concrete Ogee overflow
225.5 ft msl
1,450 ft
450 ft
3 bottom -hinged gates
225.5 ft
221 ft
226.50 ft
(229.00 ft at East Abutment)
Inflatable bladder
Powerhouse
775,000 cfs (total spillway)
10,000 cfs (gate spans)
A-81

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.12.4 Intake
The intake and powerhouse are integral structures constructed from reinforced and mass concrete
sandwiched between the right end of the spillway and the right non -overflow bulkhead. There are
five separate intakes, one for each turbine. Each intake has two sets of structural steel trash racks.
There are a total of ten vertical lift headgates, two per intake, that are motor operated by vertical
screw type stems. The headgates are constructed from structural steel trusses and skin plate, and
are filled with concrete. Each unit has a 30-inch diameter headgate bypass sluice gate with
motorized floor stand operator.
Table A1.12-3. Wateree Intake Features
Feature
Description
Type
Control
Gate Hoist Type
Number and Size of Openings
Trash Rack Bar Size
Trash Rack Bar Spacing
Rack Cleaning
Bypass Valves
Concrete
Concrete -filled, steel reinforced vertical lift gates
Individual vertical lift screw type, motor operated
from line shaft
Five 18-ft wide by 22 ft high
Five 12-ft wide by 22 ft high
6 inch wide by 0.375 inch thick
4.125 inches
None
Five 30-inch diameter vertical lift cast iron sluice
gates
A1.12.5 Water Conveyance
The intake and powerhouse structures are an integral part of the dam, without independent
penstocks or flumes. The turbines release through elbow type draft tubes into a tailrace excavated
in the river channel
A1.12.6 Powerhouse
The powerhouse consists of a concrete substructure that is an integral part of the intake structure
and spillway. A 100-ton capacity bridge type crane is provided.
A-82

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.12-4. Wateree Powerhouse Features
Feature Description
STRUCTURE
Type Indoor, aboveground powerhouse
Construction Reinforced cast -in -place concrete substructure and
floor
Steel frame with brick walls above generator floor
FEATURES
Turbines Five vertical axis, Francis type
Generators Five vertical shaft, waterwheel type, direct
connected above turbines
CONTROL ROOM
Location Local control room is in the right end of the
powerhouse
ANCILLARY EQUIPMENT
Overhead Crane Type Traveling Bridge, Whiting
Main Hook Capacity 100 tons
Auxiliary Hook Capacity 30 tons
A1.12.7 Tailrace
Draft Tube Gates are not required, as turbine runners are above normal tailwater.
Table A1.12-5. Wateree Tailrace Features
Feature Description
Type Excavated channel
Length 2,700 ft
Normal Tailwater Elevation 147.5 ft msl
A1.12.8 Trap, Sort and Transport Facility and Other Structures
Beginning in 2018, operation of a Trap, Sort and Transport (TST) Facility for upstream passage
of American Shad and Blueback Herring spawning adults above Wateree Dam will occur
annually during their spring spawning runs. The TST Facility is located approximately 1,700 feet
A-83

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
downstream of the Wateree Powerhouse along the west side of the tailrace and includes the
seasonal deployment (generally March through May) of a portable Alaskan Steeppass Model "C"
as the trapping mechanism (steeppass), guide panels suspended from floats to divert migrating
fish towards the steeppass entrance, walkway ramp for personnel, and hopper/rail conveyor to
transport captured fish from the steeppass up to a trailered holding tank.
Accessory electrical equipment includes items typical for any hydro station: generator circuit
breakers, control panels, station service transformers, batteries, and the customary protective
devices.
A1.12.9 Impoundment
Lake Wateree is the most -downstream lake on the Catawba-Wateree Project. It is located in
Lancaster, Kershaw, and Fairfield Counties, South Carolina. With approximately 214.9 mi of
shoreline, Lake Wateree covers approximately 13,025 acres (full pond contour 225.5 ft msl).
Lake Wateree was completed in 1920.
A-84

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.12-6. Wateree Impoundment
Feature Description
Maximum Water Surface (Full Pond) 225.5 ft msl
Normal Maximum Water Surface 225.5 ft msl
Normal Minimum Water Surface 218.5 ft msl
Drainage Area 4,750 sq. miles
Shoreline Length 214.9 miles
Estimated Gross Capacity of Lake Wateree 183,860 ac-ft
Reservoir
A1.12.10 Bypassed Reaches
There is a short, 2,000-ft bypassed reach immediately below the spillway.
A1.12.11 Turbine/Generators
The Wateree Powerhouse contains five vertical axis, Francis type turbines that drive synchronous
AC generators. The normal operating gross head with all five units at Wateree generating at peak
efficiency is 75.5 ft. For a corresponding estimated net head of 74.0 feet including water
conveyance system head losses, the generating units have the following performance:
Turbine Output
Peak Efficiency
21,867 HP
Units 1 & 5 Generator Rating: 17,100 kW @ 0.95 pf; 18,000 kVA
Units 2 through 4 Generator Rating: 18,050 kW @ 0.95 pf; 19,000 kVA
The authorized installed capacity as defined by 18CFR§ 11.1(i) is 82.0 MW.
At full gate and the normal operating gross head, the five turbines have an estimated maximum
hydraulic capacity of 15,880 cfs. The runners for Units 1 and 3 include turbine auto venting
capability for dissolved oxygen enhancement.
A digital hydraulic governor controls each turbine through servomotor -operated wicket gates.
The governor receives its speed indication from a permanent magnet generator mounted on the
A-85

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
exciter shaft. The governor oil pressure is supplied by a governor hydraulic package consisting of
two 15-HP, AC motor -driven, positive displacement pumps with a nitrogen gas pressure
accumulator. The two governor motor -pumps are redundant and alternate in lead -lag sequence
under normal operation to equalize load.
Each turbine has two headgates to provide unit isolation for dewatering and maintenance. One
AC motor drives the line shaft for all the headgates. Each headgate has a drive system that is
connected to the line shaft by dog -clutches. There is a second AC motor for backup. A
handwheel is provided for manual operation.
Each turbine is direct connected to a vertical shaft, air-cooled generator. A single Kingsbury
thrust bearing carries the thrust load for both the turbine and generator. The thrust bearing is
located above the generator rotor in the thrust tub on top of the generator bridgetree. Generator
neutrals are grounded through a resistor.
Plant controls reside in PLCs located at the station. Local, manual controls are available at each
unit. Control may be exercised from a computer screen in the plant control room or remotely
from the Regulated Renewables Operations Center in Charlotte, NC.
A1.12.12 Primary Transmission Lines in the Project
There are no primary transmission lines within the Wateree Project Boundaries.
A1.12.13 Switchyards
Step-up transformers are located over the draft tubes on an extension of the generator floor.
Power is transmitted overhead at high tension to a switchyard inshore and approximately 100 ft
downstream from the building. Transformer Bank Two, which connects Units 3 and 4 to the
transmission system is rated at 29.5 MVA, with force -oil and forced -air cooling, three-phase.
Five step-up transformers interconnect the powerhouse to the 100 kV transmission system. Each
is rated at 18.48 MVA, with forced -air-cooling, three-phase.
A1.12.14 Federal Lands
There are no federal lands within the Wateree Project Boundaries.
A-86

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
Figure A1.1-2. Catawba-Wateree Area System Map
Legend
— Rivers
State Boundaries
_ Lakes
I 1
Catavrha-UUa[eree Rivers Basin
11 County Boundaries
ti
.road
•�� •1101e+4
11�.,1.11le
irY dim �"xtre�-mmi,mpt
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1111.613,11155.
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1
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6r, VOISIONFAIIVA
40444104"1/1
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CA ti,LINA
-
Mil.
DUKE POWER,
CATAWBA-WATEREE AREA
SYSTEM MAP
FigureAl.1-1
0 25 50 75 10D 125
Miles
A-87

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
Figure A11-3. Catawba-Wateree Bridgewater Development — Lake James
Mitchell County
\l
PISGAH
NATIONAL PARS'
Lake James
s 0,
E JAMES STATE PARK
M on MCID DI' CREEK WA
RESTORATION
McDowell County
Burke County
Bridgewater
Powerhouse
dd Creek
Glen Alpine
ENALPIN
RECREATZO ARK
Paddy Creek
Bypassed Reach
Morganto
400A* WI
flab
1
11WIA
4440441R0
Map Location K l \
Legend
Rivers & Streams Parks
Cities 1 Lakes
0
12,000 24,000
Feet
A-88
1
Figure A1.1-2
Catawba-W ateree
Bridgewater Development -
Lake James
Sheet 1 of 1
Base data derived from USGS 7.5-minute series
topographic maps.
Map information was compiled from the best available sources.
No wanany is made for its accumcy and completeness.

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
Figure A1.1-4. Catawba-Wateree Rhodiss Development — Lake Rhodiss
Ga
TUTTLE STATE FOREST
FR TUTTLE STATE
OREST
Dr
el
ell
V7E WMO
T CO M : UMTY PAR
Lend
Cajah's Mountain
Caldwell County
Rhodhiss Lake
MCGALLIAR LI
FALLS PARK
ese
Sawm
Rutherford College
Connelly Springs
Burke County
40
Cedar Rock
OAK- HILL RaiRITANPARK
ite %IIs
hiss Dam
odhi
RHODHISS PA
met
Granite Fal
Hickory
bko
LONG VZEWRECREATIONA
Hildebran 1=i;7;or
BRc
MOUNTAIN VIEW RECRE,
Catawba County
4`mk
reox
4#jp
Map Location
z \
Legend
- Rivers & Streams Parks
_ Cities Lakes
0
12,000 24,000
Feet
Figure A1.1-3
Catawba-W ateree
Rhodhiss Development -
Lake Rhodhiss
Sheet 1 of 1
Base data derived from USGS 7.5-minute series
topographic maps.
Map information was compiled from the best available sources.
No warranty is made for its accuracy and completeness.
A-89

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
Figure A1.1-5. Catawba-Wateree Oxford Development — Lake Hickory
RURITAN PARK
Caldwell County
Gr' ite Falls
Granite
Hilde
Granite Fall
rd
Brookford
MOUNTAIN VIEW
RECREATION CENTER
ak. Hicko
CLAREid •
•
ZIT PARK
aremont
Lt
Alexan
Oxford Powerhouse
r County
xford
Catawba County
uono
on
4.41f4r
iralativ
01111,4"11E14
7444111,14
Map Location
a l \
A
Legend
- Roads Parks
- Rivers & Streams ® Lakes
Cities
0
12,000 24,000
Feet
Figure A1.1-4
Catawba-W ateree
Oxford Development -
Lake Hickory
Sheet 1 of 1
Base data derived from USGS 7.5-minute series
topographic maps.
Map information was compiled from the best available sources.
No warranty is made for its accuracy and completeness.
A-90

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
Figure A1.1-6. Catawba-Wateree Lookout Shoals Development — Lookout Shoals Lake
Alexander County
Iredell County
Lookout Shoals Lake
Lookout Shoals Dam
Conover
aremont
er
Catawba County
Newton
man
States 'Ile
States 'Ile
Statesville
LAKE NORMAN
STATE PARK
*Ada
valefout
‘44414re
Map Location
z ti
Legend
Rivers & Streams
Cities
0
Parks
Lakes
10,000 20,000
Feet
Figure A1.1-5
Catawba-W ateree
Lookout Shoals Development -
Lookout Shoals Lake
Sheet 1 of 1
Base data derived from USGS 7.5-minute series
topographic maps.
Map information was compiled from the best available so es
ra
No wany is made for its accuracy and completeness.
urc
A-91

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
Figure A1.1-7. Catawba-Wateree Cowans Ford Development — Lake Norman
Cawb a
LAKENORMAN
STATE PARK
Catawba County
\
Lake Norman
Lincoln County
EASTLNlCOLN
COUNTY PARK
0owans Ford Powerhouse
Tro an
NOR
Huntersvi
77
C„
Iredell County
Mooresvill
illy / LIBERTY AREA
LLEMUNICIPAL
F COURSE
e Norman
Davidson
Mecklenburg County
BU:: PARK
RAMAH CREEK
0141104& No
Vain"
SININLP-4
44409
Map Location It
A
Legend
— Rivers & Streams
Cities
14,000
Feet
Parks
Lakes
Figure A1.1-6
Catawba-W ateree
Cowans Ford Development -
Lake Norman
Sheet 1 of 1
Base data derived from USGS 7.5-minute series
topographic maps.
Map information was compiled from the best available sows es.
No warranty is made for i6 accuacy and completeness.
A-92

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
Figure A1.1-8. Catawba-Wateree Mountain Island Development — Mountain Island Lake
M
Lincoln County
Gaston County
nley
Cra
of -
Gas onia
GMAT
Mountain Island Powerhouse
BE
DAVIS PAR
Mountain Isla • Dam
Huntersville
Mountain
Island Lake
LATTA PLANTATION
NATURE PARK II
Mountain Island Bypassed Reach
EKBLUFF
enburg County
arlotte
*Not
irillEsmot
ij'Vealk4
4441W410%
Legend
Rivers & Streams Parks
Cities Lakes
1
10,000 20,000
Feet
Figure A1.1-7
Catawba-W ateree
Mountain Island Development -
Mountain Island Lake
Sheet 1 of 1
Base data derived from USGS 7.5-minute series
topographic maps.
Map information was compiled from the best available sows es.
No warranty is made for its accuracy and completeness.
A-93

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
Figure A1.1-9. Catawba-Wateree Wylie Development — Lake Wylie
WBA CREEK
Gastonia
Gaston County
South Carolina
South Carolina
— ark�Coumy
�AV
� reox
-mit MN
At*
Map Location
Legend
- Rivers & Streams Parks
Cities Lakes
1
14,000 28.000
Feet
Figure A1.1-8
Catawba-Wateree
Wylie Development -
Lake Wylie
Sheet 1 of 1
Base data derived from USGS 7.5-minute series
topographic maps.
Map information was compiled from the best available sources.
No womanly is made for its accumcy and completeness.
A-94

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
Figure A1.1-10. Catawba-Wateree Fishing Creek, Great Falls -Dearborn, Rocky Creek -
Cedar Creek Developments — Fishing Creek, Great Falls -Dearborn, Rocky Creek -Cedar
Creek Reservoirs
C 901
Chester
C 901
Fishing Creek Powerhouse
Short Bypassed Reach
Rotary Creek Powerhouse
'shrug C
Lancaster County
t Falls Reservior
Long Bypassed Reach
Great Fall Da :, .• Dam I Great Falls 8 Dearborn Powerhouses
Cedar Creek Powerhouse
Fairfield County
edar C
ocky Creek
eek Reservior
m
Kershaw Cot
Map Location
Legend
- Roads
Coos
1 1
Parks
L akcs
0 11.CJG 22000
Feel
Figure A1.1-9
Catall ba-Wateree
Fishing Creek, Great Falls -Dearborn,
Rocky Creek -Cedar Creek Developments -
Fishing Creek, Great Falls-Dearhorn,
Rocky Creek -Cedar Creek Resenoirs
Sheet 1 of 1
Bose Jurn throrrwl From I.SGS 7.5-m inutc ecri s
topvgrsphic map,
wLL. a•nq�i,l ir..n m= tr.! n.v1 h k.�r.c.
�o winury. nrde for Pis ncucacy and c m,pct:r ,,s
A-95

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
Figure A1.1-11. Catawba-Wateree Wateree Development — Lake Wateree
Lancaster
County
LAKE WATEREE STATE PARK
Lake
Wateree
Fairfield County
Richland County
fit‘writip
valailk Alt
OPPIVIIN
Map Location
111
Legend
Rivers & Streams
Cities
Parks
Lakes
14,000 28,000
Feet
Kershaw County
tL
Figure A1.1-10
Catawba-Wateree
Wateree Development -
Lake Wateree
Sheet 1 of 1
Base data derived from USGS 7 5-minute series
topographic maps.
Map information was compiled from the best available sources.
No warranty is made for it accuracy and completeness_
A-96

Duke Energy Carolinas, LLC I Catawba-Wateree Hydroelectric Project (FERC No. 2232)
Revised Exhibit A
Final Version
January 2023

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
TABLE OF CONTENTS
EXHIBIT A - PROJECT DESCRIPTION A-1
A1.0 Facilities Design A-2
A1.1 System Capacity A-2
A1.2 Bridgewater Development A-4
A1.2.1 Overview A-4
A1.2.2 Dams A-4
A1.2.3 Spillways A-6
A1.2.4 Intake A-7
A1.2.5 Water Conveyance A-8
A1.2.6 Powerhouse A-8
A1.2.7 Tailrace A-9
A1.2.8 Other Structures A-9
A1.2.9 Impoundment A-9
A1.2.10 Bypassed Reaches A-10
A 1.2.1 1 Turbine/Generators A-10
A1.2.12 Primary Transmission Lines in the Project A-11
A 1.2.13 Switchyards A-11
A1.2.14 Federal Lands A-12
A1.3 Rhodhiss Development A-13
A1.3.1 Overview A-13
A1.3.2 Dam A-13
A1.3.3 Spillways A-14
A1.3.4 Intake A-15
A1.3.5 Water Conveyance A-15
A1.3.6 Powerhouse A-15
A1.3.7 Tailrace A-16
A1.3.8 Other Structures A-16
A1.3.9 Impoundment A-17
A1.3.10 Bypassed Reaches A-17
A1.3.11 Turbine/Generators A-17
A1.3.12 Primary Transmission Lines in the Project A-19
A 1.3.13 Switchyards A-19
A 1.3.14 Federal Lands A-19

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A 1.4 Oxford Development A-20
A 1.4.1 Overview A-20
A 1.4.2 Dam A-20
A1.4.3 Spillways A-21
A1.4.4 Intake A-22
A1.4.5 Water Conveyance A-22
A1.4.6 Powerhouse A-22
A1.4.7 Tailrace A-23
A1.4.8 Other Structures A-23
A 1.4.9 Impoundment A-24
A1.4.10 Bypassed Reaches A-24
A1.4.11 Turbine/Generators A-24
A1.4.12 Primary Transmission Lines in the Project A-25
A1.4.13 Switchyards A-26
A1.4.14 Federal Lands A-26
A1.5 Lookout Shoals A-27
A1.5.1 Overview A-27
A1.5.2 Dam A-27
A1.5.3 Spillways A-28
A 1.5.4 Intake A-29
A1.5.5 Water Conveyance A-29
A1.5.6 Powerhouse A-30
A1.5.7 Tailrace A-30
A1.5.8 Other Structures A-31
A1.5.9 Impoundment A-31
A1.5.10 Bypassed Reaches A-31
A1.5.11 Turbine/Generators A-31
A1.5.12 Primary Transmission Lines in the Project A-33
A1.5.13 Switchyards A-33
A1.5.14 Federal Lands A-33
A1.6 Cowans Ford Development A-34
A1.6.1 Overview A-34
A 1.6.2 Dams A-34
A1.6.3 Spillway A-35
ii

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.6.4 Intake A-35
Al .6.5 Water Conveyance A-36
A1.6.6 Powerhouse A-36
A1.6.7 Tailrace A-37
A1.6.8 Other Structures A-37
A1.6.9 Impoundment A-38
A1.6.10 Bypassed Reaches A-38
A1.6.11 Turbine/Generators A-38
A1.6.12 Primary Transmission Lines in the Project A-39
A1.6.13 Switchyards A-39
A1.6.14 Federal Lands A-39
A1.7 Mountain Island Development A-40
A 1.7.1 Overview A-40
A1.7.2 Dam A-40
A1.7.3 Spillway A-41
A1.7.4 Intake A-42
A1.7.5 Water Conveyance A-43
A1.7.6 Powerhouse A-43
A1.7.7 Tailrace A-43
A1.7.8 Other Structures A-44
A 1.7.9 Impoundment A-44
A1.7.10 Bypassed Reaches A-44
A1.7.11 Turbine/Generators A-45
A1.7.12 Primary Transmission Lines in the Project A-46
A1.7.13 Switchyards A-46
A1.7.14 Federal Lands A-46
A1.8 Wylie Development A-47
A1.8.1 Overview A-47
A1.8.2 Dam A-47
A1.8.3 Spillways A-48
A1.8.4 Intake A-49
A1.8.5 Water Conveyance A-49
A 1.8.6 Powerhouse A-50
A1.8.7 Tailrace A-50
iii

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Al .8.8 Other Structures A-51
Al .8.9 Impoundment A-51
Al .8.10 Bypassed Reaches A-52
A1.8.11 Turbine/Generators A-52
A1.8.12 Primary Transmission Lines in the Project A-53
A1.8.13 Switchyards A-53
A1.8.14 Federal Lands A-53
A1.9 Fishing Creek Development A-54
A1.9.1 Overview A-54
A1.9.2 Dam A-54
A1.9.3 Spillways A-55
A1.9.4 Intake A-56
A1.9.5 Water Conveyance A-56
A1.9.6 Powerhouse A-56
A1.9.7 Tailrace A-57
A1.9.8 Other Structures A-58
A1.9.9 Impoundment A-58
A1.9.10 Bypassed Reaches A-58
A1.9.11 Turbine/Generators A-58
A1.9.12 Primary Transmission Lines in the Project A-60
A1.9.13 Switchyards A-60
A1.9.14 Federal Lands A-60
A1.10 Great Falls -Dearborn Development A-61
A1.10.1 Overview A-61
A1.10.2 Dams A-61
A1.10.3 Spillways A-62
A1.10.4 Intakes A-63
A1.10.5 Water Conveyance A-64
A1.10.6 Powerhouse A-64
A1.10.7 Tailrace A-66
A1.10.8 Other Structures A-67
A1.10.9 Impoundment A-67
A 1.10.10 Bypassed Reaches A-67
A 1.10.11 Turbine/Generators A-68
iv

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.10.12 Primary Transmission Lines in the Project A-70
A1.10.13 Switchyards A-70
A1.10.14 Federal Lands A-70
A1.11 Rocky Creek -Cedar Creek Development A-71
A1.11.1 Overview A-71
A1.11.2 Dams A-71
A1.11.3 Spillways A-72
A1.11.4 Intake A-73
A1.11.5 Water Conveyance A-74
A1.11.6 Powerhouses A-74
A1.11.7 Tailrace A-76
A1.11.8 Other Structures A-76
A1.11.9 Impoundment A-76
A1.11.10 Bypassed Reaches A-77
A 1.11.11 Turbine/Generators A-77
A1.11.12 Primary Transmission Lines in the Project A-79
A1.11.13 Switchyards A-79
A1.11.14 Federal Lands A-79
A1.12 Wateree Development A-80
A1.12.1 Overview A-80
A1.12.2 Dam A-80
A1.12.3 Spillways A-81
A1.12.4 Intake A-82
A1.12.5 Water Conveyance A-82
A1.12.6 Powerhouse A-82
A1.12.7 Tailrace A-83
A1.12.8 Trap, Sort and Transport Facility and Other Structures A-83
A1.12.9 Impoundment A-84
A1.12.10 Bypassed Reaches A-85
A1.12.11 Turbine/Generators A-85
A1.12.12 Primary Transmission Lines in the Project A-86
A1.12.13 Switchyards A-86
A1.12.14 Federal Lands A-86
v

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
LIST OF FIGURES
Figure A1.0-1. Rivers Map
Figure A1.1-2. Catawba-Wateree Area System Map
Figure A1.1-3.
Figure A1.1-4.
Figure A1.1-5.
Figure A1.1-6.
Figure A1.1-7.
Figure A1.1-8.
Figure A1.1-9.
A-3
A-87
Catawba-Wateree Bridgewater Development Lake James A-88
Catawba-Wateree Rhodiss Development — Lake Rhodiss A-89
Catawba-Wateree Oxford Development — Lake Hickory A-90
Catawba-Wateree Lookout Shoals Development — Lookout Shoals Lake A-91
Catawba-Wateree Cowans Ford Development — Lake Norman A-92
Catawba-Wateree Mountain Island Development — Mountain Island Lake A-93
Catawba-Wateree Wylie Development — Lake Wylie A-94
Figure A1.1-10. Catawba-Wateree Fishing Creek, Great Falls -Dearborn, Rocky Creek -Cedar
Creek Developments — Fishing Creek, Great Falls -Dearborn, Rocky Creek -Cedar Creek
Reservoirs A-95
Figure A1.1-11. Catawba-Wateree Wateree Development — Lake Wateree A-96
LIST OF TABLES
Table A1.2-1. Catawba Dam Features A-5
Table A1.2-2. Paddy Creek Dam Features A-5
Table A1.2-3. Linville Dam Features A-6
Table A1.2-4. Catawba Spillway Features A-6
Table A1.2-5. Linville -Paddy Creek Spillway Features A-7
Table A1.2-6. Linville Intake Features A-7
Table A1.2-7. Bridgewater Water Conveyance Features A-8
Table A1.2-8. Bridgewater Tailrace Features A-9
Table A1.2-9. Bridgewater Impoundment A-10
Table A1.2-10. Bridgewater Powerhouse Features A-11
Table A1.3-1. Rhodhiss Dam Features A-14
Table A1.3-2. Rhodhiss Spillway Features A-14
Table A1.3-3. Rhodhiss Intake Features A-15
Table A1.3-4. Rhodhiss Powerhouse Features A-16
Table A1.3-5. Rhodhiss Tailrace Features A-16
Table A1.3-6. Rhodhiss Impoundment A-17
Table A1.4-1. Oxford Dam Features A-21
Table A1.4-2. Oxford Spillway Features A-21
Table A1.4-3. Oxford Intake Features A-22
vi

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.4-4.
Table A1.4-5.
Table A1.4-6.
Table A1.5-1.
Table A1.5-2.
Table A1.5-3.
Table A1.5-4.
Table A1.5-5.
Table A1.5-6.
Table A1.6-1.
Table A1.6-2.
Table A1.6-3.
Table A1.6-4.
Table A1.6-5.
Table A1.6-6.
Oxford Powerhouse Features
Oxford Tailrace Features
Oxford Impoundment
Lookout Shoals Dam Features
Lookout Shoals Spillway Features
Lookout Shoals Intake Features
Lookout Shoals Powerhouse Features
Lookout Shoals Tailrace Features
Lookout Shoals Impoundment
Cowans Ford Dam Features
Cowans Ford Spillway Features
Cowans Ford Intake Features
Cowans Ford Powerhouse Features
Cowans Ford Tailrace Features
Cowans Ford Impoundment
Table A1.7-1. Mountain Island Dam Features
Table A1.7-2. Mountain Island Spillway Features
Table A1.7-3. Mountain Island Intake Features
Table A1.7-4. Mountain Island Powerhouse Features
Table A1.7-5. Mountain Island Tailrace Features
Table A1.7-6. Mountain Island Impoundment
Table A1.8-1. Wylie Dam Features
Table A1.8-2. Wylie Spillway Features
Table A1.8-3. Wylie Intake Features
Table A1.8-4. Wylie Powerhouse Features
Table A1.8-5. Wylie Tailrace Features
Table A1.8-6. Wylie Impoundment
Table A1.9-1. Fishing Creek Dam Features
Table A1.9-2. Fishing Creek Spillway Features
Table A1.9-3. Fishing Creek Intake Features
Table A1.9-4. Fishing Creek Powerhouse Features
Table A1.9-5. Fishing Creek Tailrace Features
Table A1.9-6. Fishing Creek Impoundment
Table A1.10-1. Great Falls -Dearborn Dam Features
A-23
A-23
A-24
A-28
A-28
A-29
A-30
A-31
A-31
A-35
A-35
A-36
A-37
A-37
A-38
A-41
A-42
A-42
A-43
A-44
A-44
A-48
A-48
A-49
A-50
A-51
A-51
A-55
A-55
A-56
A-57
A-57
A-58
A-62
vii

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.10-2. Great Falls -Dearborn Spillway Features A-62
Table A1.10-3. Great Falls Intake Features A-63
Table A1.10-4. Dearborn Intake Features A-64
Table A1.10-5. Great Falls Powerhouse Features A-65
Table A1.10-6. Dearborn Powerhouse Features A-65
Table A1.10-7. Great Falls Tailrace Features A-66
Table A1.10-8. Dearborn Tailrace Features A-66
Table A1.10-9. Great Falls -Dearborn Impoundment A-67
Table A1.11-1. Rocky Creek -Cedar Creek Dam Features A-72
Table A1.11-2. Rocky Creek -Cedar Creek Spillway Features A-72
Table A1.11-3. Rocky Creek Intake Features A-73
Table A1.11-4. Cedar Creek Intake Features A-74
Table A1.11-5. Rocky Creek Powerhouse Features A-74
Table A1.11-6. Cedar Creek Powerhouse Features A-75
Table A1.11-7. Cedar Creek Tailrace Features A-76
Table A1.11-8. Cedar Creek Impoundment A-76
Table A1.12-1. Wateree Dam Features A-81
Table A1.12-2. Wateree Spillway Features A-81
Table A1.12-3. Wateree Intake Features A-82
Table A1.12-4. Wateree Powerhouse Features A-83
Table A1.12-5. Wateree Tailrace Features A-83
Table A1.12-6. Wateree Impoundment A-85
viii

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
EXHIBIT A - PROJECT DESCRIPTION
Regulation Defining the Content of Exhibit A
The following excerpt from the Code of Federal Regulations (CFR) at 18CFR§ 4.51(b) describes
the required content of this exhibit.
Exhibit A is a description of the project. This exhibit need not include information on project
works maintained and operated by the U.S. Army Corps of Engineers, the Bureau of Reclamation,
or any other department or agency of the United States, except for any project works that are
proposed to be altered or modified. If the project includes more than one dam with associated
facilities, each dam and the associated component parts must be described together as a discrete
development. The description for each development must contain:
(1) The physical composition, dimensions, and general configuration of any dams,
spillways, penstocks, powerhouses, tailraces, or other structures, whether existing or
proposed, to be included as part of the project;
(2) The normal maximum surface area and normal maximum surface elevation (mean sea
level), gross storage capacity, and usable storage capacity of any impoundments to
be included as part of the project;
(3) The number, type, and rated capacity of any turbines or generators, whether existing
or proposed, to be included as part of the project;
(4) The number, length, voltage, and interconnections of any primary transmission lines,
whether existing or proposed, to be included as part of the project (see 16 U.S.C. 796
(11);
(5) The specifications of any additional mechanical, electrical, and transmission
equipment appurtenant to the project; and
(6) All lands of the United States that are enclosed within the project boundary, described
under paragraph (h) of this section (Exhibit G), identified and tabulated by legal
subdivisions of a public land survey of the affected area or, in the absence of a public
land survey, by the best available legal description. The tabulation must show the
total acreage of the lands of the United States within the project boundary.
A- 1

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.0 Facilities Design
A1.1 System Capacity
The Catawba-Wateree Project has an authorized installed capacity per 18CFR§ 11.1(i) of
799.127 megawatts (MW). A complete description of the Project is provided in this Exhibit
(Figure A1.0-1). This exhibit provides a description of all current project facilities including
physical dimensions and attributes. The Licensee is proposing to take measures for providing
aquatic flows, and recreation flows and for meeting applicable water quality standards. The
implementation of these measures will require physical modifications to some Project facilities.
These measures are discussed in the Catawba-Wateree license issued November 25, 2015
including a description of proposed physical modifications. All designation of left and right
follow orientation of facing downstream.
A-2

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
Figure A1.0-1. Rivers Map
Lake = es
,. Lake
Hickory
Wba - Wateree;
Lake
Rhadhiss
Lake
Norman
_North Carolina
South Carolina
Project
Location
Map Location
North
Carolina
Fishing Creek
Reservoir
Great Falls -Dearborn
Reservoir
Lookout Shoals
Lake
Mountain
Island Lake
IB
North Carolina
South Carolina
Cedar Creek
Reservoir
Lake Wateree
),]
Legend
Catawba-Wateree Basin
Lakes and Rivers
75..000 160.W0 225000 300.000
Feet
Figure A1.0-1
Catawba-Wateree Project
Rivers Nlap
Base data and watorbodv areas derival from
Acnal Photography. 2004. Map information
',as compiled from the best availahlc sources.
Nn v.arranry is made for its accuracy and
completeness.
A-3

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
A1.2 Bridgewater Development
A1.2.1 Overview
The Bridgewater hydropower facility consists principally of three dams, two spillways, an intake
structure, and powerhouse. The dams impound the Catawba River, Paddy Creek, and Linville
River to form Lake James (Figure E1.1-2). All structures are within a four -mile radius of the
Town of Glen Alpine, North Carolina. The dams and powerhouse were first operated in May
1919.
A1.2.2 Dams
The development is comprised of three dams: the Catawba Dam, across the main stem of the
Catawba River; the Paddy Creek Dam, across Paddy Creek; and the Linville Dam, across the
Linville River. The Catawba Dam is located in McDowell and Burke Counties, North Carolina;
the other two structures are entirely in Burke County. All three dams have paved roadways on
their crests and riprap on their upstream slopes. The roadway at Catawba Dam is no longer open
to public traffic. Semi -hydraulic fills at the three dams have been or are being strengthened in
accordance with Commission order to enhance stability during a seismic event.
The Catawba Dam consists of a concrete gravity spillway structure 305 ft long by approximately
120 ft maximum height, with a concrete core wall structure 125 ft long extending from the left
side of the spillway into the Catawba embankment at its left bank; a semi -hydraulic fill earthen
embankment approximately 850 ft long extending to the right abutment; and a semi -hydraulic fill
earthen embankment approximately 1,650 ft long at the left flood plain and abutment. The
A-4

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
upstream slopes are covered by riprap to elevation 1,210 ft msl and are grassed to the crest. The
downstream slopes are covered with grass. The total length of dam is approximately 3,155 ft.
Table A1.2-1. Catawba Dam Features
Feature Description
Location Southeasterly end of Lake James; McDowell
and Burke Counties, NC
Type Semi -hydraulic fill earth and concrete gravity
Height 120 ft
Crest Length 3,155 ft
Crest Elevation 1,224 ft msl maximum, 1,222 ft msl minimum
Crest Width 20 ft
The Paddy Creek Dam is a semi -hydraulic fill earthen embankment with a maximum height of
approximately 165 ft and a length along the crest of approximately 1,610 ft. The upstream slope
is covered by riprap to elevation 1,210 ft msl and is grassed to the crest. The downstream slope is
covered with grass. State Route 1233, Powerhouse Road, is a paved highway routed across the
crest of the dam.
Table A1.2-2. Paddy Creek Dam Features
Feature Description
Location Southeasterly end of Lake James;
Burke County, NC
Type Semi -hydraulic fill earthen embankment
Height 165 ft
Crest Length 1,610 ft
Crest Elevation 1,224 ft msl
Crest Width 20 ft
The Linville Dam is a semi -hydraulic fill earthen embankment with a maximum height of
approximately 160 ft and a length along the crest of approximately 1,325 ft. The upstream slope
is covered by riprap to elevation 1,210 ft msl and is grassed to the crest. The downstream slope is
covered with grass. State Route 1233 (Powerhouse Road) is a paved highway routed across the
crest of the dam.
A-5

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.2-3. Linville Dam Features
Feature Description
Location Southeasterly end of Lake James; Burke County, NC
Type Semi -hydraulic fill earthen embankment
Height 160 ft
Crest Length 1,325 ft
Crest Elevation 1,224 ft msl
Crest Width 20 ft
A1.2.3 Spillways
Catawba Spillway, located at the Catawba Dam, is an uncontrolled concrete ogee crest spillway.
The spillway has a total length of approximately 350 ft. The 68-ft-long spillway extension, at the
south end, has a crest elevation of 1,205 ft msl. The remaining 282-ft-long original spillway
section has a crest elevation of 1,200 ft msl.
Table A1.2-4. Catawba Spillway Features
Feature Description
Type Concrete Ogee overflow
Crest Elevation 1,200 ft msl
Length 350 ft
Control Ungated
Gate Hoist Type None
Gate Control Location None
Release at Elevation 1,222 ft msl 127,200 cfs
The Linville -Paddy Creek Spillway, located midway between the Linville and Paddy Creek
Dams, is a low overflow weir, without crest control, 430 ft wide with a paved channel extending
approximately 464 ft downstream. The State Route 1233 highway bridge is located over the
entrance end of the spillway. The crest elevation of the spillway is 1,200 ft msl.
A-6

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.2-5. Linville -Paddy Creek Spillway Features
Feature
Description
Type
Crest Elevation
Purpose
Length
Control
Gate Hoist Type
Gate Control Location
Release at Elevation 1,222 ft msl
Concrete weir overflow
1,200 ft msl
Flood Control
430 ft
None
None
None
126,600 cfs
A1.2.4 Intake
The intake and the powerhouse are located at the Linville Dam on the right abutment. The
reinforced concrete intake tower is founded on an excavated rock shelf at elevation 1,070 ft msl.
The tower is connected with the powerhouse by a tunnel approximately 900 ft long. Access to
the structure is by a steel truss bridge. Intake equipment includes three bays of structural steel
trash racks; three vertical lift type head gates, constructed of a structural steel skin filled with
concrete; motor -operated screw type hoists; and vertical lift type, 14-inch diameter bypass gate
valves with cast iron frames and operating mechanism.
Table A1.2-6. Linville Intake Features
Feature
Description
Type
Control
Gate Hoist Type
Number and Size of Openings
Trash Rack Bar Size
Trash Rack Bar Spacing
Rack Cleaning
Bypass Valves
Concrete
Concrete -filled, steel reinforced vertical lift gates
Individual vertical lift screw type, motor operated
from line shaft
Three 18-ft wide by 22 ft high
6 inch wide by 0.375 inch thick
4.5 inch
None
Four 14-inch diameter vertical lift cast iron sluice
gates
A-7

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.2.5 Water Conveyance
A trapezoidal -shaped canal connects the Catawba River arm of the reservoir with the Paddy
Creek and Linville River arms to form Lake James. The canal has an excavated bottom width of
30 ft, and is approximately 216 ft wide at elevation 1,200 ft msl. The elevation at the bottom of
the canal is 39 ft below full pond elevation.
Water is supplied to the powerhouse through a single penstock approximately 900 ft long. The
upstream 320 ft was excavated in solid rock and has a horseshoe -shaped concrete lining with
inside dimensions measuring 21 ft wide by 22 ft high. The remaining downstream portion was
constructed by open cut method or by tunneling in earth or soft rock, and has circular concrete
lining with an inside diameter of 20 ft. The downstream 470 ft of this latter section has a riveted
plate steel liner and the remainder has steel reinforcing. The downstream end of the penstock,
beyond the scroll case connections, is reduced for a 6 ft diameter valve and bursting plates.
Table A1.2-7. Bridgewater Water Conveyance Features
Feature Description
Type 320 ft rock tunnel, 110 ft reinforced concrete, and 470
ft riveted steel lined penstock
Downstream Control 11-ft diameter vertical butterfly Lee type valve
Gate Hoist Type Hydraulic
Size 21 ft by 22 ft horseshoe tunnel
20-ft diameter penstock
Bypass Valves One 6-ft diameter hydraulically -operated relief valve
on end of penstock, with bursting plate(s).
A1.2.6 Powerhouse
The powerhouse is a reinforced concrete structure housing two vertical shaft Francis type turbine
main generating units and one horizontal shaft Francis type auxiliary unit sized to supply
continuous minimum flow downstream. Each unit has an isolation valve. The generating units
are sized and configured so that they can be run individually or in combinations to support the
requirements for continuous minimum flow and recreation flow in the Bridgewater tailrace as
defined in the Catawba-Wateree license issued November 25, 2015. A 24-inch fixed -cone type
valve is incorporated in the design to allow flow to bypass the auxiliary generating unit if that
unit is not available to release water. In addition, the generating units are capable of providing
A-8

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
flow aeration to enhance dissolved oxygen levels in the tailrace. The units will release water into
a short reinforced concrete lined tailrace channel which leads to the Linville River. Erosion
protection is provided on the east bank of the river. The powerhouse is a low profile configuration
with no machine hall and with the generating units fully enclosed. A traveling gantry crane to
support unit assembly and disassembly is visible on the top deck of the powerhouse.
Approximate dimensions are 120 ft long, 95 ft wide with 36 ft above ground height.
A1.2.7 Tailrace
The turbines release water through elbow type draft tubes to the Linville River and return to the
Catawba River approximately 4,500 ft downstream. Normal tailwater is at elevation 1,065 ft msl.
Table A1.2-8. Bridgewater Tailrace Features
Feature Description
Type Excavated channel
Normal Tailwater Elevation 1,065 ft msl
A1.2.8 Other Structures
There are four sluiceways in the Catawba Spillway. One of the sluiceways is used for the
minimum flow release system, and the remaining sluiceways are not functional.
Accessory electrical equipment includes items typical for any hydro station: generator circuit
breakers, control cabinets, relay boards, station service transformers, motor generator sets,
batteries, and the customary protective devices.
A1.2.9 Impoundment
Lake James is the uppermost lake on the Catawba-Wateree Project. Located in Burke and
McDowell Counties, North Carolina, the lake has approximately 153 miles of shoreline. The
reservoir was built over a seven-year period beginning in 1916, with completion in 1923. It
required the construction of three dams (Linville, Paddy Creek, and Catawba) to impound the
existing approximately 6,754-acre reservoir (full pond contour 1,200 ft msl).
A-9

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.2-9. Bridgewater Impoundment
Feature Description
Maximum Water Surface (Full Pond) 1,200 ft msl
Normal Maximum Water Surface 1,198 ft msl
Normal Minimum Water Surface 1,192 ft msl
Drainage Area 380 sq. mi.
Shoreline Length 153 mi
Estimated Gross Capacity of Lake James 275,300 ac-ft
A1.2.10 Bypassed Reaches
The two bypassed reaches associated with this development include the Catawba River Bypassed
Reach and the Paddy Creek Bypassed Reach. The Catawba River Bypassed Reach (also known
as Old Catawba River) starts at the Catawba Dam and runs approximately 5.65 miles to the
confluence with the Linville River. Tributaries to this bypassed reach include Shadrick Creek
and Muddy Creek.
The Paddy Creek Bypassed Reach starts at the Paddy Creek Dam and runs approximately 0.64
miles to the confluence with the Catawba River Bypassed Reach. There are no tributaries to the
Paddy Creek Bypassed Reach besides several small springs.
A1.2.11 Turbine/Generators
The Bridgewater Powerhouse has two vertical -shaft Francis type turbine main generating units
and one horizontal -shaft Francis type auxiliary continuous minimum flow unit. The normal gross
operating head for the generating units at peak efficiency is 136 ft. For a corresponding net head
of 128 ft including water conveyance losses, the authorized installed capacity of the powerhouse
as defined by 18CFR§ 11.1(i) is 27.867 MW. Two step-up transformers for the main units will be
located in the nearby switchyard, converting the 6.6 kV generator voltages to 100 kV. A step-up
transformer for the auxiliary unit is electrically connected to the main unit transformers and will
convert the auxiliary unit 480 V generator voltage to 6.6 kV. The existing 100 kV switchyard
accommodates the dam seismic remediation geometry and the new powerhouse electrical
requirements. The powerhouse is designed for remote control and operation from the Regulated
Renewable Operations Center in Charlotte, N.C.
A-10

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.2-10. Bridgewater Powerhouse Features
Parameter
Powerhouse
Number of Units
Turbine Type — Main Units (2)
Turbine Type — Auxiliary Unit
Generator Type
Installed Capacity'
Station Flow at Peak Efficiency
Maximum Hydraulic Capacity
Unit Flow Rate
Unit Flow (Min. Flow Unit)
Maximum Generator Output
Turbine Runner Diameter
3
Francis — Vertical
Francis — Horizontal
AC, Synchronous
27.867 MW
2,645 cfs
3,260 cfs
1,250 cfs
145 cfs
32,125 kW
Main — 95.5 inches
Auxiliary (Minimum flow) — 35 inches
' Per 18CFR§ 11.1(i)
In order to make room for the Linville Dam Seismic remediation activities, a new powerhouse at
the Bridgewater Development has been constructed approximately 200 feet downstream of the
original Bridgewater Powerhouse. A new length of steel penstock has been constructed
connecting the existing water conveyance to the new powerhouse. Hydraulic transient analysis
has confirmed that the existing water conveyance components will support the new unit
requirements without the need for surge or pressure relief devices. No modification to the existing
intake in Lake James was required.
A1.2.12 Primary Transmission Lines in the Project
There are no primary transmission lines within the Bridgewater Project Boundaries.
A1.2.13 Switchyards
A switchyard with lattice type steel structure is located directly behind the powerhouse,
approximately 100 ft from the building. Step-up transformers, circuit breakers, and other
switching equipment are located in this yard. Two step-up transformers interconnect the
powerhouse to the 100 kV transmission system. Each is rated at 25 MVA with forced -air
cooling, three-phase.
A-11

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.2.14 Federal Lands
There are no federal lands within the Bridgewater Project Boundaries.
A-12

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
A1.3 Rhodhiss Development
A1.3.1 Overview
The Rhodhiss hydropower facility consists principally of an ungated mass -concrete Ogee
spillway with a small (20 ft) debris gate, an integral concrete intake -powerhouse structure, and
concrete gravity non -overflow bulkheads, which impound a narrow and long lake approximately
0.25 miles wide and 18 miles long. A powerhouse containing three turbine units utilizes the
impounded water to produce electricity. The facility is located on the Catawba River in the Town
of Rhodhiss, North Carolina, less than 15 miles east of Morganton, North Carolina (Figure E1.1-
3). The powerhouse lies on the left (north) bank of the river in Caldwell County; the right (south)
end of the dam lies in Burke County. The dam and powerhouse were first operated in February
1925.
A1.3.2 Dam
The dam consists of a concrete gravity spillway structure 780 ft long by approximately 70 ft
maximum height, a concrete gravity bulkhead structure 124 ft long, a rolled fill earthen
embankment approximately 250 ft long at the right abutment, a 20 ft long debris gate, and a
concrete intake and powerhouse structure 194 ft long, and a concrete gravity bulkhead structure
119.6 ft long at the left abutment. The debris gate, which is at the left end of the spillway adjacent
to the intake and powerhouse, is 20 ft in length and consists of a 5.5-ft-high, bottom -hinged, steel
gate raised and lowered by an inflatable bladder. The controls, compressors, and other associated
mechanical and controls equipment are housed in the powerhouse. In 2001, a floodwall was
added to the left and right bulkheads to increase the height of the walls to elevation 1,023.1 ft
A-13

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
msl. The crest of the earthen embankment at the right bank is at elevation 1,020.1 ft msl. In
2001, a sheet pile wall approximately 279 ft long with a top elevation of 1,023.1 ft msl was
installed along the upstream edge of the earthen embankment. Post -tensioned anchors were also
installed in the spillway and in the left and right bulkheads to strengthen the structures against
extreme flooding events. The total length of dam is approximately 1,517 ft.
Table A1.3-1. Rhodhiss Dam Features
Feature Description
Location
Type
Height
Crest Length
Crest Elevation
Crest Width
Southeasterly end of Lake Rhodhiss; Caldwell
Burke Counties, NC
Rolled earth and concrete gravity
70 ft
1,517 ft
1,023.1 ft msl maximum, 1,023 ft msl minimum
10ft
and
A1.3.3 Spillways
The principal dam structure consists of an ungated mass -concrete Ogee spillway approximately
780 ft long, a single 5.5-ft-high, 20 ft long, bottom -hinged, steel gate raised and lowered by an
inflatable bladder. The gate is operated to pass debris at the spillway. The crest of the spillway,
the debris gate in the closed position and full pond reservoir level is at elevation 995.1 ft msl.
The crest of the open debris gate is 989.6 ft msl.
Table A1.3-2. Rhodhiss Spillway Features
Feature
Description
Type
Crest Elevation
Length (ungated)
Length (gated)
Top of Gate Elevation
Crest Elevation with Gate Lowered
Control
Gate Hoist Type
Gate Control Location
Concrete Ogee overflow
995.1 ft msl
780 ft
20 ft
995.1 ft msl
989.6 ft msl
1 bottom -hinged gate
Inflatable bladder
Powerhouse
A-14

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Feature Description
Release at Elevation 1,023.1 ft msl 506,110 cfs
A1.3.4 Intake
The intake and powerhouse are integral structures constructed from reinforced and mass concrete
sandwiched between the left end of the spillway and the left non -overflow bulkhead. There are
three separate intakes, one for each turbine. Each intake has two sets of structural steel trash
racks. There are a total of six horizontal butterfly Lee type headgates and frames. The headgates
are constructed from cast iron and steel, and are operated by six vertical screw type stems that are
motor operated. Each unit has a 30-inch diameter headgate bypass sluice gate with manual floor
stand operator.
Table A1.3-3. Rhodhiss Intake Features
Feature
Description
Type
Control
Gate Hoist Type
Number and Size of Openings
Trash Rack Bar Size
Trash Rack Bar Spacing
Rack Cleaning
Bypass Valves
Concrete
Six cast iron and steel horizontal butterfly Lee type
Individual vertical lift screw type, motor operated
from line shaft
Six 15.5-ft wide by 21.5 ft high
4 inch wide by 0.375 inch thick
4.5 inch
None
Three 30-inch diameter vertical lift cast iron sluice
gates
A1.3.5 Water Conveyance
The intake and powerhouse structures are an integral part of the dam, without independent
penstocks or flumes.
A1.3.6 Powerhouse
The powerhouse has a reinforced concrete substructure with a steel frame and brick
superstructure, constructed in monoliths for each unit. An erection and service bay is located at
the inshore end. A 100-ton bridge type crane is provided on -site.
A-15

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.3-4. Rhodhiss Powerhouse Features
Feature Description
STRUCTURE
Type Indoor, aboveground powerhouse
Construction Reinforced cast -in -place concrete substructure and
floor
Steel frame with brick walls above generator floor
FEATURES
Turbines Three vertical axis, Francis type
Generators Three vertical shaft, waterwheel type, direct
connected above turbines
CONTROL ROOM
Location Local control room is in the left end of the
powerhouse
ANCILLARY EQUIPMENT
Overhead Crane Type Traveling Bridge, Niles
Main Hook Capacity 100 tons
Auxiliary Hook Capacity 10 tons
A1.3.7 Tailrace
The turbines release water through elbow type draft tubes into a tailrace excavated in the river
channel. Downstream, Lake Hickory extends to and forms the tailwater of the Rhodhiss Station,
with a full pond level at elevation 935 ft msl.
Table A1.3-5. Rhodhiss Tailrace Features
Feature Description
Type Excavated channel
Length 1,400 ft
Normal Tailwater Elevation 935 ft msl
A1.3.8 Other Structures
One vertical lift structural steel trash gate with frame and screw type hoist has been retired with
the addition of stoplogs to cover the gate opening and the removal of the platform and operating
mechanism. Accessory electrical equipment includes items typical for any hydro station:
A-16

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
generator circuit breakers, control cabinets, relay boards, station service transformers, motor
generator sets, batteries, and the customary protective devices.
A1.3.9 Impoundment
Lake Rhodhiss is downstream of Lake James and is located in Burke and Caldwell Counties,
North Carolina, with approximately 106.8 miles of shoreline. The reservoir was built between
1924 and 1925. Lake Rhodhiss is a long, slender lake with approximately 2,724 acres (full pond
contour 995.1 ft msl).
Table A1.3-6. Rhodhiss Impoundment
Feature Description
Maximum Water Surface
Normal Maximum Water Surface
Normal Minimum Water Surface
Drainage Area
Shoreline Length
Estimated Gross Capacity of Lake Rhodhiss
995.1 ft msl
995.1 ft msl
989.1 ft msl
1,090 sq. mi.
106.8 miles
46,500 ac-ft
A1.3.10 Bypassed Reaches
There are no bypassed reaches associated with the Rhodhiss Development.
A1.3.11 Turbine/Generators
The Rhodhiss powerhouse contains three vertical axis, Francis type turbines that drive
synchronous AC generators. The normal operating gross head with three units generating at peak
efficiency is 60.5 feet. For a corresponding estimated net head of 59 feet including water
conveyance system head losses, the generating units have the following performance:
Turbine Output
Turbine Output
Unit 1
Peak Efficiency
11,700 HP
Unit 3
Peak Efficiency
16,600 HP
A-17

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Turbine Output
Unit 2
Peak Efficiency
14,800 HP
All Units Generator Rating: 12,350 kW @ 0.95 pf; 13,000 kVA
The authorized installed capacity as defined by 18CFR§ 11.1(i) is 32.225 MW.
At full gate and the normal gross head, the three turbines have a maximum hydraulic capacity of
8,325 cfs. The turbine runner for Unit 2 includes hub -venting capability for dissolved oxygen
enhancement.
A digital hydraulic governor controls each turbine through servomotor -operated wicket gates.
The governor receives its speed indication from a speed sensor mounted on the shaft. The
governor oil pressure is supplied by a governor hydraulic package consisting of two 15-HP, AC
motor -driven, positive displacement pumps with a nitrogen gas pressure accumulator. The two
governor motor -pumps are redundant and alternate in lead -lag sequence under normal operation
to equalize load.
Each turbine has two butterfly, Lee type, headgates to provide unit isolation for dewatering and
maintenance. Each headgate has an AC motor to open and close the headgate.
Each turbine is direct connected to a vertical shaft, air-cooled generator. A single Kingsbury
thrust bearing carries the thrust load for both the turbine and generator. The thrust bearing is
located above the generator rotor in the thrust tub on top of the generator bridgetree. Generator
neutrals are grounded through a resistor. The original direct -driven exciters were retired, new
static exciters were connected to the generator field brush assemblies, and constant pressure
brushes were installed.
Plant controls reside in Programmable Logic Controllers (PLCs) located at the station. Local,
manual controls are available at each unit. Control may be exercised from a computer screen in
the plant control room or from the Regulated Renewables Operations Center in Charlotte, NC.
A-18

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.3.12 Primary Transmission Lines in the Project
There is one primary transmission line; a 0.17 mile -long segment of the line leading from the
Rhodhiss Powerhouse switching station to the Rhodhiss Tie Substation.
A1.3.13 Switchyards
A switchyard with lattice type steel structure is located immediately adjacent to the powerhouse.
Step-up transformers, circuit breakers, and other switching equipment are located in this yard.
Three step-up transformers interconnect the powerhouse to the 44 kV transmission system. Each
is rated at 25 MVA, with forced -air cooling, three-phase.
A1.3.14 Federal Lands
There are no federal lands within the Rhodhiss Project Boundaries.
A-19

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
A1.4 Oxford Development
A1.4.1 Overview
The Oxford hydropower facility is located on the Catawba River approximately seven miles
south-southwest of Taylorsville, North Carolina. The principal structures consist of a dam, which
impounds a reservoir known as Lake Hickory, a powerhouse with an integral intake structure, a
gated spillway, and concrete gravity non -overflow structures (bulkheads) at both ends of the
spillway. The powerhouse is located in Catawba County on the right bank of the river, and the
left -bank end of the dam lies in Alexander County (Figure E1.1-4). The dam and powerhouse
were first operational in April 1928.
A1.4.2 Dam
The dam consists of a concrete gravity, gated spillway structure 550 ft long in the river channel; a
concrete intake and powerhouse structure, 111 ft long at the right bank; a concrete gravity
bulkhead structure 285 ft long; and a concrete gravity overflow structure approximately 200 ft
long at the left abutment, which serves as an emergency spillway. The right abutment of the dam
has an earthen embankment approximately 170 ft long with a maximum height of 18 ft and a
crest elevation of 952 ft msl. The total length of dam is approximately1,394 ft.
In 2003, a 9-ft high floodwall was added to the right bulkhead and to the bulkhead directly behind
the powerhouse, increasing the height of the walls to elevation 959 ft msl. Concrete cantilever
walls approximately 125 ft long and a sheet pile wall approximately 55 ft long were also added
along the crest of the earthen embankment at the right bank, raising the crest elevation to 959 ft
A-20

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
msl. In 2003, an emergency spillway was constructed by removing the top 14 ft from the left
bulkhead. The new emergency spillway has a length of 193 ft with a crest elevation of 936 ft
msl. A 279-ft long soil nail wall with a maximum height of 50 ft was constructed along the left
bank to serve as a training wall for flood waters. Post -tensioned anchors were also installed in the
spillway and in the left and right bulkheads to strengthen the structures against extreme flooding
events. To stabilize the powerhouse, a concrete buttress approximately 14 ft by 35 ft by 42 ft
long and anchored with post -tensioned anchors was constructed in the tailrace between units.
Table A1.4-1. Oxford Dam Features
Feature Description
Location Southeasterly end of Lake Hickory; Catawba and
Alexander Counties, NC
Type Rolled earth and concrete gravity
Height 133 ft
Crest Length 1,394 ft
Crest Elevation 959 ft msl maximum, 950 ft msl minimum
Crest Width 20 ft
A1.4.3 Spillways
Spillway crest control consists of 10 Stoney gates 25 ft high by 45 ft clear. The spillway is a
mass -concrete Ogee structure with an overall length of approximately 540 ft. The crest elevation
of the spillway is 910 ft msl and the top of the gates are at 935 ft msl. The maximum height of
the spillway structure to the top of the spillway gate is approximately 120 ft.
Table A1.4-2. Oxford Spillway Features
Feature Description
Type Concrete Ogee overflow
Crest Elevation 910 ft msl Ogee, 935 ft msl top of gates
Length 540 ft
Control Ten Stoney type vertical lift gates, 25 ft high by 45 ft
clear
Gate Hoist Type Gantry, 70 ton, Whiting
A-2 1

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Feature Description
Gate Control Location
Release at Elevation 950 ft msl
Nine gates from the spillway bridge deck, one gate
from control room
354,100 cfs
A1.4.4 Intake
The intake and powerhouse are integral structures constructed from reinforced and mass concrete
sandwiched between the right end of the spillway and the right non -overflow bulkhead. There are
two separate intakes, one for each turbine. Each intake has two sets of structural steel trash racks.
There are a total of four horizontal butterfly Lee type headgates and frames. The headgates are
constructed from cast iron and steel, and are operated by two chains and sprocket type hoists that
are motor operated. Each unit has a 30-inch diameter headgate bypass sluice gate with motor -
driven floor stand operator.
Table A1.4-3. Oxford Intake Features
Feature Description
Type Concrete
Control Four cast iron and steel horizontal butterfly Lee type
Gate Hoist Type Individual vertical lift screw type, motor operated
from line shaft
Number and Size of Openings Six 15.5-ft wide by 21.5 ft high
Trash Rack Bar Size 4 inch wide by 0.375 inch thick
Trash Rack Bar Spacing 4.5 inch
Rack Cleaning None
Bypass Valves Two 30-inch diameter vertical lift sluice gates
A1.4.5 Water Conveyance
The intake and powerhouse structures are an integral part of the dam, without independent
penstocks or flumes.
A1.4.6 Powerhouse
The powerhouse has a reinforced concrete substructure with a steel frame and brick
superstructure, constructed in monoliths for each unit. An erection and service bay is located at
the inshore end. A 105-ton bridge type crane is provided on -site.
A-22

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.4-4. Oxford Powerhouse Features
Feature Description
STRUCTURE
Type Indoor, aboveground powerhouse
Construction Reinforced cast -in -place concrete substructure and
floor
Steel frame with brick walls above generator floor
FEATURES
Turbines Two vertical axis, Francis type
Generators Two vertical shaft, waterwheel type, direct connected
above turbines
CONTROL ROOM
Location Local control room is in a building on the right
abutment
ANCILLARY EQUIPMENT
Overhead Crane Type Traveling Bridge, Whiting
Main Hook Capacity 105 tons
Auxiliary Hook Capacity 30 tons
A1.4.7 Tailrace
Normal tailwater is at an elevation of 845.5 ft msl.
Table A1.4-5. Oxford Tailrace Features
Feature Description
Type Excavated channel
Length 430 ft
Normal Tailwater Elevation 845.5 ft msl
A1.4.8 Other Structures
One structural steel trash gate with frame and screw type hoist by Chapman Valve Manufacturing
Company is included at the structure.
A-23

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Accessory electrical equipment includes items typical for any hydro station: generator circuit
breakers, control cabinets, relay boards, station service transformers, batteries, and the customary
protective devices.
A1.4.9 Impoundment
Lake Hickory lies directly downstream of Lake Rhodhiss and is located in Alexander, Burke,
Caldwell, and Catawba Counties, North Carolina, with approximately 115.7 miles of shoreline.
The reservoir was built in 1927, and covers approximately 4,072 acres (full pond contour 935 ft
msl).
Table A1.4-6. Oxford Impoundment
Feature Description
Maximum Water Surface (Full Pond) 935 ft msl
Normal Maximum Water Surface 935 ft msl
Normal Minimum Water Surface 929 ft msl
Drainage Area 1,310 sq. miles
Shoreline Length 115.7 miles
Estimated Gross Capacity of Lake Hickory 103,300 ac-ft
A1.4.10 Bypassed Reaches
There are no bypassed reaches associated with the Oxford Development.
A1.4.11 Turbine/Generators
The Oxford Powerhouse contains two vertical axis, Francis type turbines with synchronous AC
generators. The normal operating gross head with two units generating at peak efficiency is 88 ft.
For a corresponding estimated net head of 86 ft including water conveyance system head losses,
the generating units have the following performance:
Turbine Output
Turbine Output
Unit 1
Peak Efficiency
23,800 HP
Unit 2
Peak Efficiency
28,200 HP
A-24

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Generator Rating: 18,000 kW @ 0.8 pf; 22,500 kVA
The authorized installed capacity as defined by 18CFR§ 11.1(i) is 35.85 MW.
At full gate and normal head, the two turbines have a maximum hydraulic capacity of 6,755 cfs.
The runners include hub -venting capability that can be used for dissolved oxygen enhancement.
A digital hydraulic governor controls each turbine through servomotor -operated wicket gates.
The governor receives its speed indication from a speed sensor mounted on the turbine shaft. The
governor oil pressure is supplied by a governor hydraulic package consisting of two 15-HP, AC
motor -driven, positive displacement pumps with a nitrogen gas pressure accumulator. The two
governor motor -pumps are redundant and alternate in lead -lag sequence under normal operation
to equalize load.
Each turbine has two butterfly Lee type headgates to provide unit isolation for dewatering and
maintenance. Each headgate has an AC motor to open and close the headgate. A handwheel is
provided for manual operation of each headgate.
Each turbine is direct connected to a vertical shaft, air-cooled generator. A single Kingsbury
thrust bearing carries the thrust load for both the turbine and generator. The thrust bearing is
located above the generator rotor in the thrust tub on top of the generator bridgetree. Generator
neutrals are grounded through a resistor. The original direct -driven exciters are retired, and new
static exciters are connected to the generator field brush assemblies. Constant pressure brushes
are installed.
Plant controls reside in PLCs located at the station. Local, manual controls are available at each
unit. Control may be exercised from a computer screen in the plant control room or from the
Regulated Renewables Operations Center in Charlotte, NC.
A1.4.12 Primary Transmission Lines in the Project
There are no primary transmission lines within the Oxford Project Boundaries.
A-25

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.4.13 Switchyards
A switchyard with lattice type steel structure is located approximately 40 ft from the powerhouse
building. Two phase step-up transformers, circuit breakers, and other switching equipment are
located in this yard. The step-up transformers interconnect the powerhouse to the 100 kV
transmission system. The transformers are rated at 25 MVA, three -phased, forced -air cooled.
A1.4.14 Federal Lands
There are no federal lands within the Oxford Project Boundaries.
A-26

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
A1.5 Lookout Shoals
A1.5.1 Overview
The Lookout Shoals hydropower facility is located on the Catawba River approximately 11 miles
west-southwest of Statesville, North Carolina, and approximately 4 miles north-northwest of
Catawba, North Carolina (Figure E1.1-5). The dam is located on the Catawba River in Catawba
and Iredell Counties, North Carolina. The principal structures of the project include a
powerhouse with an integral intake structure, an ungated mass concrete spillway, concrete gravity
non -overflow bulkheads, and an earthen embankment. The hydropower facility began
commercial operation during or shortly after December 1915.
A1.5.2 Dam
The dam is comprised of the following structures, in order, starting from the right abutment: an
earthen embankment, approximately 1,287 ft long by approximately 88 ft maximum height; a
concrete core wall or gravity bulkhead section 65 ft long; a 933-ft long, uncontrolled concrete
gravity spillway with crest elevation of 838.1 ft msl; a concrete intake and powerhouse structure
194.8 ft long; and a concrete gravity bulkhead structure 270 ft long. The total length of the dam
is approximately 2,731 ft. In July 1916, the west end of the dam and the west (right) abutment
were washed out by a flood. Subsequently, the embankment and core wall section, with a
training and retaining wall downstream from the spillway, was constructed.
Prior to the dam rehabilitation work performed from 1999 to 2000, the shorter (65 ft) right -bank
bulkhead was 1 ft lower than the longer (270 ft) left -bank bulkhead, which is at an elevation of
860.1 ft msl. Dam rehabilitation work raised the elevation of the right bulkhead to elevation 866
A-27

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
ft msl, and added a 112-ft section of floodwall on the left bulkhead with a top elevation of 866.2
ft msl. Additionally, post -tensioned anchors were added to the left and right bulkheads and to the
powerhouse bulkhead to strengthen the structures against extreme flood events.
On the right -bank (west) side of the dam, there is an earthen embankment approximately 1,287 ft
long with a crest elevation of 868.9 ft msl. The maximum height of the dam to the crest of the
spillway is approximately 88 ft.
Table A1.5-1. Lookout Shoals Dam Features
Feature Description
Location Southeasterly end of Lookout Shoals Lake; Catawba
and Iredell Counties, NC
Type Semi -hydraulic fill earth and concrete gravity
Height 88 ft
Crest Length 2,731 ft
Crest Elevation 868.9 ft msl maximum, 838.1 ft msl minimum
Crest Width 10 ft
A1.5.3 Spillways
The spillway is a mass concrete Ogee structure approximately 933 ft long with a crest elevation
of 838.1 ft msl. The original spillway crest was lowered 6 ft after the July 1916 flood.
Table A1.5-2. Lookout Shoals Spillway Features
Feature Description
Type Concrete Ogee overflow
Crest Elevation (Full Pond) 838.1 ft msl
Length 933 ft
Control None
Gate Hoist Type None
Gate Control Location None
Release at Elevation 860.1 ft msl 391,275 cfs
A-28

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.5.4 Intake
The intake and powerhouse are integral structures constructed from reinforced and mass concrete
sandwiched between the left end of the spillway and the left non -overflow bulkhead. There are
four separate intakes, one for each of the three main turbines and a fourth for the two junior
turbines (upgraded exciter intake). Each intake has one set of structural steel trash racks. Three
vertical lift headgates are motor operated by a dual drum cable hoist system. The headgates are
constructed from structural steel trusses and skin plate, and are filled with concrete. Each unit has
a 20-inch diameter headgate bypass sluice gate with floor stand operator. The upgraded exciter
intake has a vertical lift timber headgate.
Table A1.5-3. Lookout Shoals Intake Features
Feature Description
Type Concrete
Control Three concrete -filled, steel reinforced vertical lift
gates
One timber vertical lift gate
Gate Hoist Type Drum and cable vertical lift type, motor operated from
line shaft
Geared rack
Number and Size of Openings Three 18-ft wide by 22 ft high
One 7-ft wide by 14 ft high
Trash Rack Bar Size 6 inch wide by 0.375 inch thick
Trash Rack Bar Spacing 4.125 inch
Rack Cleaning None
Bypass Valves Three 20-inch diameter vertical lift cast-iron sluice
gate
A1.5.5 Water Conveyance
The intake and powerhouse structures are an integral part of the dam, without independent
penstocks or flumes. The turbines release through elbow type draft tubes into a tailrace excavated
in the river channel The two junior turbines release through steel funnel draft tubes.
A-29

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.5.6 Powerhouse
The powerhouse has a reinforced concrete substructure with a steel frame and brick
superstructure. The powerhouse is on the east, or Iredell County, side of the river. The
powerhouse is an integral part of the left -bank bulkhead. A 60-ton bridge type crane is provided
on -site.
Table A1.5-4. Lookout Shoals Powerhouse Features
Feature Description
STRUCTURE
Type Indoor, aboveground powerhouse
Construction Reinforced cast -in -place concrete substructure and
floor
Steel frame with brick walls above generator floor
Large Turbines Three vertical axis, Francis type
Small Turbines Two vertical axis, Francis type
Large Generators Three vertical shaft, waterwheel type, direct connected
above turbines
Small Generators Two vertical shaft, waterwheel type, direct connected
above turbines
CONTROL ROOM
Location Local control room is in the left end of the
powerhouse
ANCILLARY EQUIPMENT
Overhead Crane Type Traveling Bridge, Whiting
Main Hook Capacity 60 tons
Auxiliary Hook Capacity 30 tons
A1.5.7 Tailrace
Impounded by the Cowans Ford Dam, Lake Norman forms the tailwater of the Lookout Shoals
facility at its normal full pond level at elevation 760 ft msl.
A-30

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.5-5. Lookout Shoals Tailrace Features
Feature Description
Type Excavated channel
Length 550 ft
Normal Tailwater Elevation 760 ft msl
A1.5.8 Other Structures
Accessory electrical equipment includes items typical for any hydro station: generator circuit
breakers, control cabinets, relay boards, station service transformers, batteries, and the customary
protective devices. Station auxiliary power feeds from not only the typical station service
transformers, but also two small 480 V, 500 kVA auxiliary generators.
A1.5.9 Impoundment
Lookout Shoals Lake lies directly downstream of Lake Hickory and is located in Alexander,
Catawba, and Iredell Counties, North Carolina, with approximately 35.2 miles of shoreline. The
reservoir was built in 1915 and covers approximately 1,155 acres (full pond contour 838.1 ft msl).
Table A1.5-6. Lookout Shoals Impoundment
Feature Description
Maximum Water Surface (Full Pond) 838.1 ft msl
Normal Maximum Water Surface 838.1 ft msl
Normal Minimum Water Surface 834.6 ft msl
Drainage Area 1,450 sq. mi.
Shoreline Length 35.2 miles
Estimated Gross Capacity of 25,000 ac-ft
Lookout Shoals Lake
A1.5.10 Bypassed Reaches
There are no bypassed reaches associated with the Lookout Shoals Development.
A1.5.11 Turbine/Generators
The Lookout Powerhouse contains three main vertical axis, Francis type turbines, and two
smaller vertical axis, Francis type turbines, all with synchronous AC generators. The smaller
units are auxiliary AC generators resulting from the conversion of the turbine -driven DC
A-3 1

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
generators previously used to provide generator excitation for the main generators. A static
excitation system was installed to provide generator excitation for the three main generators. The
normal operating gross head with three units generating at peak efficiency is 74.5 ft. For a
corresponding estimated net head of 73 ft including water conveyance system head losses, the
generating units have the following performance:
Turbine Output
Turbine Output
Units 1-3
Peak Efficiency
8.235 MW
Auxiliary Units A & B
Peak Efficiency
0.37 MW
Main Generator Rating: 8,970 kW @ 1.0 pf; 8,970 kVA
Auxiliary Generator Rating: 450 kW @ 0.9 pf; 500 kVA
The authorized installed capacity as defined by 18CFR§ 11.1(i) is 25.715 MW.
At full gate and the normal operating gross head, the five turbines have a combined maximum
hydraulic capacity of 5,304 cfs.
A digital hydraulic governor controls each turbine through servomotor -operated wicket gates.
The governor receives its speed indication from a speed sensor mounted on the turbine shaft. The
governor oil pressure is supplied by a governor hydraulic package consisting of two 15-HP, AC
motor -driven, positive displacement pumps with a nitrogen gas pressure accumulator. The two
governor motor -pumps are redundant and alternate in lead -lag sequence under normal operation
to equalize load.
Each turbine has one headgate to provide unit isolation for dewatering and maintenance. One AC
motor drives the line shaft for all the headgates. Each headgate has a drive system that is
connected to the line shaft by clutches. A handwheel is provided for manual operation of each
headgate. The two auxiliary turbines have electric motor -operated (EMO) control valves to
isolate the units. A handwheel is provided on each EMO operator for manual operation.
A-32

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Each turbine is direct connected to a vertical shaft, air-cooled generator. A single Kingsbury
thrust bearing carries the thrust load for both the turbine and generator. The thrust bearing is
located above the generator rotor in the thrust tub on top of the generator bridgetree. Generator
neutrals are grounded through a resistor. The original exciters were converted to small generating
units. New static exciters are connected to the generator field brush assemblies. Constant
pressure brushes are installed.
Plant controls reside in PLCs located at the station. Local, manual controls are available at each
unit. Control may be exercised from a computer screen in the plant control room or from the
Regulated Renewables Operations Center in Charlotte, NC.
A1.5.12 Primary Transmission Lines in the Project
A 0.2-mile-long, 100 kV transmission line leads to the Lookout Tie Substation.
A1.5.13 Switchyards
An outdoor switchyard with lattice type steel structures is located approximately 130 ft from the
powerhouse building. Step-up transformers, circuit breakers, and other switching equipment are
located in this yard. Two step-up transformers interconnect the powerhouse to the 100 kV
transmission systems. Each is rated at 22.4 MVA, with forced oil and air-cooling, three-phase.
A1.5.14 Federal Lands
There are no federal lands within the Lookout Shoals Project Boundaries.
A-33

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
A1.6 Cowans Ford Development
w
A1.6.1 Overview
The Cowans Ford hydroelectric facility consists of a dam that impounds a reservoir known as
Lake Norman and is located on the Catawba River approximately 16 miles northwest of
Charlotte, North Carolina, and approximately seven miles west-northwest of Huntersville, North
Carolina (Figure E1.1-6). The dam is built across the Catawba River in Lincoln and
Mecklenburg Counties, North Carolina. The powerhouse is on the west, or Lincoln County, side
of the river. The hydropower facility began commercial operation in September 1963.
A1.6.2 Dams
The principal structures of the dam include a powerhouse with an integral intake structure, a
gated spillway, bulkheads, earthen embankments at the end of the bulkheads, and a saddle dam
(Hicks Cross Roads Dike) located across a low feature on the reservoir rim.
The bulkheads are concrete gravity non -overflow structures with a top elevation of 770 ft msl.
The right -bank bulkhead is 276 ft long and the left -bank bulkhead is approximately 210 ft long.
Dam rehabilitation work performed in 2000 installed 5-ft high floodwalls, raising the elevation of
the bulkheads to elevation 775 ft msl. Post -tensioned anchors were also installed in the right
bulkhead to strengthen it against extreme flooding events.
Earthen embankments are located at each end of the dam and are connected to each bulkhead.
Approximately 1,765 ft of the left bank (east) embankment has a crest elevation of 775 ft msl.
The remaining easternmost 1,770 ft of the embankment has an elevation of 780 ft msl. The right -
bank (west) embankment is 3,924 ft long and has a crest elevation of 775 ft msl.
A-34

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
The Hicks Cross Roads Dike is approximately 3,139 ft long and has a crest elevation of 775 ft
msl. The upstream slopes of all embankments are covered by riprap. The crest and downstream
slopes are covered with grass.
Table A1.6-1. Cowans Ford Dam Features
Feature Description
Location South end of Lake Norman; Lincoln and Mecklenburg
Counties, NC
Type Rolled earth and concrete gravity
Height 130 ft
Crest Length 8,738 ft
Crest Elevation 780 ft msl maximum, 770 ft msl minimum
Crest Width 20 ft
A1.6.3 Spillway
The spillway is a mass concrete Ogee structure with 11 Tainter gates and an overall length of
approximately 465 ft. The crest elevation of the spillway is 732 ft msl and the elevation of the
top of the closed gates is 760 ft msl. The maximum height of the dam to the spillway crest is
approximately 92 ft. Post -tensioned anchors were added in 2000 to strengthen the spillway
structure against extreme flood events.
Table A1.6-2. Cowans Ford Spillway Features
Feature Description
Type Concrete Ogee overflow
Crest Elevation 732 ft msl Ogee, 760 ft msl top of Tainter gate
Length 465 ft
Control Eleven Tainter gates, 28 ft high by 35 ft wide
Gate Hoist Type Two 55-ton trolley type chain hoists
Gate Control Location Spillway bridge deck, elevation 770 ft msl
Release at Elevation 770 ft msl 277,130 cfs
A1.6.4 Intake
The intake and powerhouse are integral structures constructed from reinforced and mass concrete
sandwiched between the right end of the spillway and the right non -overflow bulkhead. Four
A-35

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
separate intakes supply water to the turbines to produce electricity. Each intake consists of three
sets of trash racks and head gates. An 80-ton gantry type traveling hoist is provided for gate
operation.
Table A1.6-3. Cowans Ford Intake Features
Feature
Description
Type
Control
Gate Hoist Type
Number and Size of Openings
Trash Rack Bar Size
Trash Rack Bar Spacing
Rack Cleaning
Stop Logs
Bypass Valves
Concrete
One structural steel vertical slide gate with rollers per
unit
Two structural steel vertical slide gates per unit
300-ton gantry type, American Hoist & Derrick
Twelve 17.7-ft wide by 49 ft high (3 per unit)
4 inch wide by 0.50 inch thick with round edges
9 inch
None
Two sets of structural steel vertical slide gates
Four 24-inch diameter vertical lift cast iron sluice
gates
A1.6.5 Water Conveyance
The substructure of the powerhouse is an integral part of the dam. No independent penstocks or
flumes are required. The turbines release through elbow type draft tubes into a tailrace channel.
A1.6.6 Powerhouse
The powerhouse consists of a concrete substructure that is an integral part of the intake structure
and spillway. The powerhouse is constructed from reinforced concrete, 328 ft long, at the right
abutment. An operating gallery is provided beneath the generator floor and immediately
downstream from the units. An electrically operated 300-ton gantry type traveling crane is
provided for erection and dismantling of the units. Governors, unit control boards, and related
equipment are located between the units, facing the operating gallery. Low-tension switchgear is
housed beneath the generator floor and immediately downstream from the operating gallery. This
enclosure contains the main control room. An erection and service bay was constructed at the
inshore end of the unit structures.
A-36

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.6-4. Cowans Ford Powerhouse Features
Feature Description
STRUCTURE
Type Indoor, belowground powerhouse
Construction Reinforced cast -in -place concrete substructure and
floor
FEATURES
Turbines Twoadjustable blade and two fixed blade propeller,
Kaplan type
Generators Four vertical shaft, waterwheel type, direct connected
above turbines
CONTROL ROOM
Location Local control room is in the powerhouse
ANCILLARY EQUIPMENT
Overhead Crane Type
Main Hook Capacity
Gantry type, American Hoist & Derrick
300 tons
A1.6.7 Tailrace
Mountain Island Lake extends to and forms the tailwater of the station. Normal tailwater
elevation is 645 ft msl.
Table A1.6-5. Cowans Ford Tailrace Features
Feature Description
Type Excavated channel
Length 810 ft
Normal Tailwater Elevation 645 ft msl
A1.6.8 Other Structures
A stop log arrangement is provided for closing off the spillway opening for painting and repair of
the gates.
A-37

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Structural steel sliding type draft tube gates are provided for closing off any one of the draft tubes
against tailwater. A 30-ton gantry crane on the draft tube deck operates these gates.
A cellular cofferdam arrangement is provided upstream of the intake structure. A total of five
cells, 49.8 ft in diameter, make up the left end of an underwater weir system with crest elevation
of 725 ft msl. A rolled earth dike makes up the remainder of the weir and forms the abutment
with the west embankment.
A1.6.9 Impoundment
Lake Norman lies directly downstream of Lookout Shoals Lake and is located in Mecklenburg,
Iredell, Catawba, and Lincoln Counties, North Carolina. The reservoir was completed in 1963
and covers approximately 32,339 acres (full pond contour 760 ft msl) with approximately 603.1
mi of shoreline. The Licensee has three power plants on Lake Norman, including Cowans Ford
Hydroelectric Station, which was completed in 1967. Marshall Steam Station and McGuire
Nuclear Station are also located on Lake Norman.
Table A1.6-6. Cowans Ford Impoundment
Feature Description
Maximum Water Surface (Full Pond) 760 ft msl
Normal Maximum Water Surface 760 ft msl
Normal Minimum Water Surface 751 ft msl
Drainage Area 1,790 sq. miles
Shoreline Length 603.1 miles
Estimated Gross Capacity of Lake Norman 1,093,600 ac-ft
A1.6.10 Bypassed Reaches
There are no bypassed reaches associated with the Cowans Ford Development.
A1.6.11 Turbine/Generators
The Cowans Ford Powerhouse contains four vertical axis, Kaplan type turbines with synchronous
AC generators, two of which are adjustable blade and two of which are fixed blade. The normal
operating gross head with four units generating at peak efficiency is 108 feet. For a
corresponding estimated net head of 106 ft including water conveyance system head losses, the
generating units have the following performance:
A-3 8

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Turbine Output
Peak Efficiency
120,000 HP
Generator Rating: 83,125 kW @ 0.95 pf; 87,500 kVA
The authorized installed capacity as defined by 18CFR§ 11.1(i) is 332.5 MW. At maximum
power and the normal operating gross head of 108 ft, the four turbines have a maximum hydraulic
capacity of 54,400 cfs.
Cabinet type governors with standard auxiliaries and controls are provided at the site. Each
turbine is direct connected to a vertical shaft, air-cooled generator. Exciters are direct connected
to each generator. The customary auxiliaries, controls, and protective devices are provided at the
site. Generator neutrals are grounded through a resistor. Unit 2 is equipped with a static
excitation system.
Plant controls reside in Programmable Logic Controllers (PLCs) located at the station. Local,
manual controls are available at each unit. Control may be exercised from a computer screen in
the plant control room or from the Regulated Renewables Operations Center in Charlotte, NC.
A1.6.12 Primary Transmission Lines in the Project
A 1.67-mile-long, 230—kV transmission line leads from the Cowans Ford Powerhouse to the
McGuire Switching Station.
A1.6.13 Switchyards
There is no switchyard located at this development. Two transformers interconnect the plant with
the 230 kV transmission systems. Both are located on top of the powerhouse. Transformer Bank
1, which connects Units 1 and 2 to the transmission system is rated at 225 MVA, with forced oil
and forced air-cooling, three-phase.
A1.6.14 Federal Lands
There are no federal lands within the Cowans Ford Project Boundaries.
A-39

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
A1.7 Mountain Island Development
A1.7.1 Overview
The Mountain Island Development is located on the Catawba River approximately 11 miles
northwest of Charlotte, North Carolina, and approximately 3 miles north-northeast of Mount
Holly, North Carolina (Figure E1.1-7). The principal structures of the Mountain Island
hydropower facility include a powerhouse with an integral intake structure, an uncontrolled
spillway, two bulkheads, and an earthen embankment. The powerhouse is located in Gaston
County on the right (west) bank of the river and the left bank (east) end of the dam lies in
Mecklenburg County. The hydropower facility began commercial operation in December 1923.
A1.7.2 Dam
The dam consists of the following structures, in order, starting from the right abutment: an
earthen embankment with a crest elevation of 674.5 ft msl constructed by the semi -hydraulic fill
method, approximately 670 ft long by approximately 140 ft maximum height, with a concrete
core wall 75 ft long; a concrete gravity bulkhead section 200 ft long; a concrete intake and
powerhouse structure 246 ft long; a concrete gravity bulkhead section 259 ft long; and a concrete
gravity spillway structure approximately 997 ft long. The total length of dam is approximately
2,375 ft.
A compacted earthfill counterweight stability berm is being constructed along the downstream
slope of the existing embankment to improve seismic performance of the structure. The stability
berm will have a minimum embankment crest elevation of 673.0 ft amsl (NGVD29) with a
A-40

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
downstream slope of 2.5H:1 V from the crest to a bench at approximate elevation 621 feet that
serves as the access road to the powerhouse. The bench has a minimum width of approximately
30 feet and widens to a maximum of 60 feet from west to east along the length of the bench.
Below this bench the design slope of the berm will be 2.5H:1V for the majority of the slope,
steepening to 2.0H:1 V near the cyclopean retaining wall structure south of the powerhouse. This
design extends the existing footprint of the embankment approximately 150 feet south.
The crest of the embankment dam prior to modification is approximately 20 feet wide at an
elevation that ranges between 672 feet msl and 674.5 ft msl. Modifications to the embankment
dam includes raising the elevation of the majority of the crest and construction of a drainage
feature that separates the original crest and crest of the buttress berm. After construction of the
earthen buttress berm, the elevation of the crest will range between 677 ft msl and 673 ft msl and
the effective crest width (i.e., original crest width plus crest width of buttress berm) of the
embankment dam will be 120 feet.
A 6-ft floodwall was added to the 259 ft, left (east) bulkhead in 1998 to increase the height of the
wall to approximately 668.5 ft msl.
Table A1.7-1. Mountain Island Dam Features
Feature Description
Location Southeasterly end of Mountain Island Lake;
Mecklenburg and Gaston Counties, NC
Type Semi -hydraulic fill earth and concrete gravity
Height 140 ft
Crest Length 2,375 ft
Crest Elevation 677 ft msl maximum, 673 ft msl minimum
Crest Width 120 ft
A1.7.3 Spillway
The spillway is a mass concrete Ogee structure approximately 997 ft long with a crest elevation
of 647.5 ft msl. The spillway has no crest control. The maximum height of the dam to the crest
of the spillway is approximately 97 ft.
A-4 1

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.7-2. Mountain Island Spillway Features
Feature Description
Type
Crest Elevation
Length
Control
Gate Hoist Type
Gate Control Location
Release at Elevation 667.5 ft msl
Concrete Ogee overflow
647.5 ft msl
997 ft
Ungated
None
None
373,785 cfs
A1.7.4 Intake
The intake and powerhouse are integral structures constructed from reinforced and mass concrete
sandwiched between the right end of the spillway and the right non -overflow bulkhead. There are
four separate intakes, one for each turbine. Each intake has two sets of structural steel trash
racks. There are a total of eight horizontal butterfly Lee type headgates and frames. The
headgates are constructed from cast iron and steel, and are operated by eight vertical screw type
stems that are motor operated. Each unit has a 24-inch diameter headgate bypass sluice gate with
manual floor stand operator.
Table A1.7-3. Mountain Island Intake Features
Feature
Description
Type
Control
Gate Hoist Type
Number and Size of Openings
Trash Rack Bar Size
Trash Rack Bar Spacing
Rack Cleaning
Bypass Valves
Concrete
Eight cast iron and steel horizontal butterfly Lee type
Individual vertical lift screw type, motor operated
from line shaft
Eight 15.5-ft wide by 21.5 ft high
6 inch wide by 0.375 inch thick
4.5 inch
None
Four 30-inch diameter vertical lift cast iron sluice
gates
A-42

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.7.5 Water Conveyance
The intake and powerhouse structures are an integral part of the dam without independent
penstocks or flumes.
A1.7.6 Powerhouse
The powerhouse has a reinforced concrete substructure with a steel frame and brick
superstructure, constructed in monoliths for each unit. The superstructure consists of brick walls
with steel trusses supporting the roof. A 100-ton bridge type crane is provided on -site.
Table A1.7-4. Mountain Island Powerhouse Features
Feature Description
STRUCTURE
Type Indoor, aboveground powerhouse
Construction Reinforced cast -in -place concrete substructure and
floor
Steel frame with brick walls above generator floor
FEATURES
Turbines Four vertical axis, Francis type
Generators Four vertical shaft, waterwheel type, direct connected
above turbines
CONTROL ROOM
Location Local control room is in the powerhouse
ANCILLARY EQUIPMENT
Overhead Crane Type Traveling Bridge, Niles
Main Hook Capacity 100 tons
Auxiliary Hook Capacity 10 tons
A1.7.7 Tailrace
The turbines release water through elbow type draft tubes into a tailrace channel. The tailrace
was constructed by widening and deepening a secondary channel of the river. It rejoins the main
A-43

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
channel approximately 2,500 ft below the powerhouse. Lake Wylie downstream, with normal
full pond level at elevation 569.4 ft msl, extends to the station and forms its tailwater.
Table A1.7-5. Mountain Island Tailrace Features
Feature Description
Type Excavated Channel
Length 2,500 ft
Normal Tailwater Elevation 569.4 ft msl
A1.7.8 Other Structures
One trash gate constructed from structural steel with frame and motor -driven hoist is included.
Accessory electrical equipment includes items typical for any hydro station: generator circuit
breakers, control panels, relay boards, station service transformers, batteries, and the customary
protective devices.
A1.7.9 Impoundment
Mountain Island Lake lies directly downstream of the Cowans Ford Development and is located
in Mecklenburg, Lincoln, and Gaston Counties, North Carolina. The reservoir was completed in
1924, and covers approximately 3,117 acres (full pond contour 647.5 ft msl) with approximately
96.5 mi of shoreline.
Table A1.7-6. Mountain Island Impoundment
Feature Description
Maximum Water Surface (Full Pond) 647.5 ft msl
Normal Maximum Water Surface 647.5 ft msl
Normal Minimum Water Surface 641.8 ft msl
Drainage Area 1,860 sq. miles
Shoreline Length 96.5 miles
Estimated Gross Capacity 57,300 ac-ft
of Mountain Island Lake
A1.7.10 Bypassed Reaches
There is a 0.7-mile bypassed reach associated with the Mountain Island Development below the
spillway.
A-44

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.7.11 Turbine/Generators
The Mountain Island Powerhouse contains four vertical axis, Francis type turbines with
synchronous AC generators. The normal operating gross head with four units generating at peak
efficiency is 76 ft. For a corresponding estimated net head of 75 ft including water conveyance
system head losses, the generating units have the following performance:
Turbine Output
Units 1 and 2
Peak Efficiency
21,873 HP
Generator Rating: 15,000 kW @ 0.8 pf; 18,750 kVA
Turbine Output
Units 3 and 4
Peak Efficiency
20,760 HP
Generator Rating: 15,000 kW @ 0.8 pf; 18,750 kVA
The authorized installed capacity as defined by 18CFR§ 11.1(i) is 60 MW.
At full gate and the normal operating gross head of 76 ft, the four turbines have a maximum
hydraulic capacity of 12,130 cfs.
Each turbine is direct connected to a vertical shaft, air-cooled generator. A single Kingsbury
thrust bearing carries the thrust load for both the turbine and generator. The thrust bearing is
located above the generator rotor in the thrust tub on top of the generator bridgetree.
Each turbine is complete with actuator type governors and accessory equipment. Exciters are
direct connected to each generator. The customary auxiliaries, controls, and protective devices
are provided. Generator neutrals are grounded through a resistor.
A-45

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Plant controls reside in Programmable Logic Controllers (PLCs) located at the station. Local,
manual controls are available at each unit. Control may be exercised from a computer screen in
the plant control room or from the Regulated Renewables Operations Center in Charlotte, NC.
A1.7.12 Primary Transmission Lines in the Project
There are no primary transmission lines within the Mountain Island Project Boundaries.
A1.7.13 Switchyards
Two step-up transformers are located within a switchyard adjacent to the powerhouse. Each step-
up transformer serves as an interconnect to the 44 kV transmission system for two Mountain
Island generators. Each transformer is three-phase, 40 MVA, with forced -air cooling.
A1.7.14 Federal Lands
There are no federal lands within the Mountain Island Project Boundaries.
A-46

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
A1.8 Wylie Development
A1.8.1 Overview
The Wylie hydroelectric facility is located on the Catawba River in York County, South Carolina,
approximately 17 miles southwest of Charlotte, North Carolina, and approximately 3 miles west
of Fort Mill, South Carolina (Figure E1.1-8). The original " Catawba Station" began operation
in 1904. In 1924 and 1925, the dam was raised approximately 49.5 ft, new structures were added,
the old power plant was dismantled, and the structures were incorporated into the new Wylie
Dam. The principal structures of the Wylie hydropower facility include a powerhouse with an
integral intake structure, a spillway with gated and ungated sections, bulkheads, and an earthen
embankment. The Wylie Plant began operation in August 1925.
A1.8.2 Dam
The dam is comprised of the following structures, in order, starting from the right abutment: a
rolled -fill earthen embankment approximately 1,595 ft long, a concrete gravity bulkhead section
315 ft long, a concrete gravity spillway section 793 ft long at the crest, a concrete intake and
powerhouse section 271.8 ft long, and a concrete gravity bulkhead section approximately 190 ft
long.
The mass concrete bulkheads on each side of the dam have a crest elevation of 584.5 ft msl (right
bank) and 584.6 ft msl (left bank). The earthen embankment has a crest elevation of 589.4 ft msl.
The maximum height of the dam, from the foundation of the dam to the crest of the uncontrolled
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Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
spillway, is approximately 119 ft. The total length of dam along the crest is approximately 3,165
ft.
From 2003 to 2004, post -tensioned anchors were installed in the gated spillway sections and the
right and left bulkheads to stabilize the structures against probable maximum flood events. To
stabilize the powerhouse, three concrete buttresses were constructed in the tailrace between units
and anchored with post -tensioned anchors.
Table A1.8-1. Wylie Dam Features
Feature Description
Location South end of Lake Wylie; York County, SC
Type Rolled -fill earthen embankment and concrete gravity
Height 119 ft
Crest Length 3,165 ft
Crest Elevation 589.4 ft msl maximum, 584.4 ft msl minimum
Crest Width 20 ft
A1.8.3 Spillways
The spillway is a mass concrete Ogee structure with two controlled sections separated by a
curved, uncontrolled section. The uncontrolled section is approximately 157 ft long, with a crest
elevation of 569.4 ft msl. The two -gated sections of the spillway have a crest elevation of 539.4
ft msl, with the section on the right bank (south) approximately 320 ft long with six floodgates
and a trash gate. The section on the left bank is approximately 265 ft long and has five
floodgates. Each floodgate is 30 ft high by 45 ft clear. The gates are operated by two motor -
driven vertical lift screw type traveling hoists. The hoists travel on a structural steel runway
supported by lattice steel towers on each gate pier. The trash gate located next to the right
bulkhead has been retired.
Table A1.8-2. Wylie Spillway Features
Feature Description
Type Concrete Ogee overflow
Crest Elevation 539.4 ft msl, gated; 569.4 ft msl, Ogee
Length 793 ft
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Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Feature Description
Control Eleven steel, Stoney type floodgates, 30 ft high by 45
ft clear
Gate Hoist Type Two 84-ton gantry cranes with two vertical lift screw
stems
Gate Control Location Spillway access walkway
Release at Elevation 584.4 ft msl 544,660 cfs
A1.8.4 Intake
The intake and powerhouse are integral structures constructed from reinforced and mass concrete
sandwiched between the left end of the spillway and the left non -overflow bulkhead. There are
four separate intakes, one for each turbine. Each intake has two sets of structural steel trash
racks. There are a total of eight horizontal butterfly Lee type headgates and frames. The
headgates are constructed from cast iron and steel and operated by eight vertical screw type stems
that are motor operated. Each unit has a 30-inch diameter headgate bypass sluice gate with
motor -driven floor stand operator.
Table A1.8-3. Wylie Intake Features
Feature Description
Type
Control
Concrete
Eight horizontal butterfly Lee type (two per unit)
Gate Hoist Type Eight motor -driven, vertical lift, screw type, with
crosshead and connecting bar.
Number and Size of Openings Eight 17.7-ft wide by 24.8 ft high
Trash Rack Bar Size 4 inch wide by 0.562 inch thick
Trash Rack Bar Spacing 3.5 inch
Rack Cleaning None
Bypass Valves Four 30-inch diameter vertical lift cast iron sluice
gates
A1.8.5 Water Conveyance
The intake and powerhouse structures are an integral part of the dam, without independent
penstocks or flumes.
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Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.8.6 Powerhouse
The powerhouse is located on the left (north) bank of the river. The powerhouse consists of a
concrete substructure, which is an integral part of the intake structure and spillway. The
superstructure consists of brick walls with steel trusses supporting the roof. An erection and
service bay is located at the inshore end. There is a separate warehouse and shop building located
on the left bank downstream of the powerhouse. A 100-ton bridge type crane is provided on -site.
Table A1.8-4. Wylie Powerhouse Features
Feature Description
STRUCTURE
Type Indoor, aboveground powerhouse
Construction Reinforced cast -in -place concrete substructure and
floor
Steel frame with brick walls above generator floor
FEATURES
Turbines Four vertical axis, Francis type
Generators Four vertical shaft, waterwheel type, direct connected
above turbines
CONTROL ROOM
Location Local control room is in the left end of the
powerhouse
ANCILLARY EQUIPMENT
Overhead Crane Type Traveling Bridge, Whiting
Main Hook Capacity 100 tons
Auxiliary Hook Capacity 30 tons
A1.8.7 Tailrace
The turbines release water through elbow type draft tubes into a tailrace excavated in the river
channel. Normal tailwater elevation is at 499.4 ft msl.
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Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.8-5. Wylie Tailrace Features
Feature Description
Type Excavated channel
Length 800 ft
Normal Tailwater Elevation 499.4 ft msl
A1.8.8 Other Structures
One trash gate is located at the right end of the flood gate structure with an opening 25 ft high by
17.4 ft clear. This gate has been retired. Another trash gate is located at the left end of the intake
structure, constructed from structural steel with frame and motor -driven screw type hoist. This
gate has been retired.
Accessory electrical equipment includes items typical for any hydro station: generator circuit
breakers, control cabinets, relay boards, station service transformers, batteries, and the customary
protective devices.
A1.8.9 Impoundment
Lake Wylie, the oldest lake of the Catawba-Wateree Project is located directly downstream of
Mountain Island Lake. The lake is located in Gaston and Mecklenburg Counties, North Carolina;
and York County, South Carolina. The total shoreline length for Lake Wylie is approximately
348.5 mi, with a surface area of approximately 12,177 acres (full pond contour 569.4 ft msl). The
Licensee has three power plants on Lake Wylie, including Wylie Hydro Station, Allen Steam
Station, and the Catawba Nuclear Station.
Table A1.8-6. Wylie Impoundment
Feature Description
Maximum Water Surface (Full Pond) 569.4 ft msl
Normal Maximum Water Surface 569.4 ft msl
Normal Minimum Water Surface 563.4 ft msl
Drainage Area 3,020 sq. miles
Shoreline Length 348.5 miles
Estimated Gross Capacity of Lake Wylie 229,200 ac-ft
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Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.8.10 Bypassed Reaches
There are no bypassed reaches associated with the Wylie Development.
A1.8.11 Turbine/Generators
The Wylie Powerhouse contains four vertical axis, Francis type turbines with synchronous AC
generators. As authorized by the new license issued on November 25, 2015, Unit 4 was
commissioned in September 2020 with a replacement aerating runner and is operated as a
minimum flow unit.
The normal operating gross head with four units generating at peak efficiency is 68.5 feet. For a
corresponding estimated net head of 67.0 ft including water conveyance system head losses, the
generating units have the following performance:
Peak Efficiency
Turbine Output (Units 1-3): 23,000 HP
Turbine Output (Unit 4): 8,167 HP
Generator Rating (Units 1-4): 18,000 kW @ 0.9 pf; 20,000 kVA
The rated head for Unit 4 is 70.7 ft, which is a function of lower tailwater level when the main
Units (1-3) are not operating.
The authorized installed capacity as defined by 18CFR§ 11.1(i) is 57.875 MW.
At full gate opening and the normal operating gross head, the four turbines have an estimated
maximum hydraulic capacity of 12,376 cfs (3,794 cfs for each Units 1-3 and 1,270 for Unit 4).
The runners for Units 2 and 3 include hub -venting capability for dissolved oxygen enhancement.
A digital hydraulic governor controls each turbine through servomotor -operated wicket gates.
The governor receives its speed indication from a gear -driven speed sensor mounted on the shaft.
The governor oil pressure is supplied by a governor hydraulic package consisting of two 15-HP,
AC motor -driven, positive displacement pumps with a nitrogen gas pressure accumulator. The
two governor motor -pumps are redundant and alternate in lead -lag sequence under normal
operation to equalize load.
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Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Each turbine has two butterfly Lee type headgates to provide unit isolation for dewatering and
maintenance. Each headgate has an AC motor to open and close the headgate. A handwheel is
provided for manual operation.
Each turbine is direct connected to a vertical shaft, air-cooled generator. A single Kingsbury
thrust bearing carries the thrust load for both the turbine and generator. The thrust bearing is
located above the generator rotor in the thrust tub on top of the generator bridgetree. Generator
neutrals are grounded through a resistor. The original direct -driven exciters are retired. New
static exciters are connected to the generator field brush assemblies. Constant pressure brushes
are installed.
Plant controls reside in PLCs located at the station. Local, manual controls are available at each
unit. Control may be exercised from a computer screen in the plant control room or from the
Regulated Renewables Operations Center in Charlotte, NC.
A1.8.12 Primary Transmission Lines in the Project
There are no primary transmission lines within the Wylie Project Boundaries.
A1.8.13 Switchyards
Step-up transformers and necessary switching equipment are located in an outdoor switchyard
immediately inshore from and adjacent to the powerhouse building. Four step-up transformers
interconnect the powerhouse to the 44 kV transmission system. Each is rated at 22.4 MVA, with
forced air-cooling, three-phase. Each transformer' s 44 kV circuit breaker is located on the hill
adjacent to the powerhouse switchyard.
A1.8.14 Federal Lands
There are no federal lands within the Wylie Project Boundaries.
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Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
A1.9 Fishing Creek Development
A1.9.1 Overview
The Fishing Creek Hydro Development is located on the Catawba River approximately 11 miles
southwest of Lancaster, South Carolina, and less than 2 miles north-northeast of the Town of
Great Falls, South Carolina (Figure E1.1-9). The principal structures of the Fishing Creek
hydropower facility include a powerhouse with an integral intake structure, a gated spillway, an
overflow spillway, and a bulkhead. The powerhouse is located on the right (west) bank of the
river in Chester County while the left -bank (east) end of the dam lies in Lancaster County. The
hydropower facility began commercial operation in late 1916. In 1927, the head on the plant was
increased 15 ft by the installation of floodgates. At that time, the east end of the spillway was
rebuilt.
A1.9.2 Dam
The dam is comprised of the following structures, in order, starting from the right abutment: a
concrete gravity bulkhead structure approximately 214 ft long; a concrete intake and powerhouse
structure 250 ft long; a concrete gravity, gated spillway 1,200 ft long; and a concrete gravity,
overflow spillway structure approximately 120 ft long with its crest level with the top of gates.
The total length of dam is approximately 1,770 ft.
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Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.9-1. Fishing Creek Dam Features
Feature Description
Location South end of Fishing Creek Reservoir; Chester and
Lancaster Counties, SC
Type Concrete gravity
Height 97 ft
Crest Length 1,770 ft
Crest Elevation 429.2 ft msl maximum, 425.2 ft msl minimum
A1.9.3 Spillways
The controlled spillway is a mass concrete Ogee structure with 22 Stoney gates and an overall
length of approximately 1,210 ft. One gate has been retired, leaving twenty-one operational
gates. The gates are operated by two motor -driven vertical lift screw type traveling hoists. The
hoists travel on a structural steel runway supported by lattice steel towers on each gate pier. The
crest elevation of the gated spillway is 392.2 ft msl and the top of the gates is at 417.2 ft msl. The
uncontrolled spillway located at the left end of the dam is also a mass concrete Ogee structure
with a length of approximately 114 ft and a crest elevation of 417.2 ft msl. The maximum height
of the dam from the foundation of the dam to the crest of the uncontrolled spillway is
approximately 97 ft. Remedial work necessitated by erosion at the spillway toe was done in
1938.
Table A1.9-2. Fishing Creek Spillway Features
Feature Description
Type Concrete Ogee overflow
Crest Elevation 392.2 ft msl Ogee, 417.2 ft msl top of gates
Length 1,210 ft
Control Twenty-one steel, Stoney type floodgates, 25
ft high by 45 ft clear
Gate Hoist Type Two motor -driven, vertical lift, screw type,
traveling on a structural steel runway
supported by steel towers on the gate piers
Gate Control Location Spillway access walkway
Release at Elevation 428.2 ft msl 837,650 cfs
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Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.9.4 Intake
The intake and powerhouse are integral structures constructed from reinforced and mass concrete
sandwiched between the right end of the spillway and the right non -overflow bulkhead. There are
five separate intakes, one for each of the turbines. Each intake has one set of structural steel trash
racks. Five vertical lift headgates are motor operated by a dual drum cable hoist system. The
headgates are constructed from structural steel trusses and skin plate, and are filled with concrete.
Each unit has an inclined 12 inch by 24 inch headgate bypass sluice gates with floor stand
operator.
Table A1.9-3. Fishing Creek Intake Features
Feature
Description
Type
Control
Gate Hoist Type
Number and Size of Openings
Trash Rack Bar Size
Trash Rack Bar Spacing
Rack Cleaning
Bypass Valves
Concrete Ogee overflow
Five concrete -filled, steel reinforced vertical lift gates
Drum and cable vertical lift type, motor operated from
line shaft
Three 26-ft wide by 20 ft high
6 inch wide by 0.375 inch thick
4.125 inch
None
Five inclined 12 inch wide by 24 inch high headgate
bypass sluice gates
A1.9.5 Water Conveyance
The intake and powerhouse structures are an integral part of the dam, without independent intakes
or flumes.
A1.9.6 Powerhouse
The powerhouse has a reinforced concrete substructure with a steel frame and brick
superstructure. After the July 1916 flood, the powerhouse bulkhead was raised 10 ft, the
basement floor was filled with concrete, and the downstream wall of the powerhouse substructure
was reinforced. An 80-ton bridge type crane is provided on -site. The powerhouse is on the west,
or Chester County, side of the river.
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Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.9-4. Fishing Creek Powerhouse Features
Feature Description
STRUCTURE
Type Indoor, aboveground powerhouse
Construction Reinforced cast -in -place concrete substructure and
floor
Steel frame with brick walls above generator floor
FEATURES
Turbines Five vertical axis, Francis type
Generators Five vertical shaft, waterwheel type, direct connected
above turbines
CONTROL ROOM
Location Local control room is in the right end of the
powerhouse
ANCILLARY EQUIPMENT
Overhead Crane Type Traveling Bridge, Whiting
Main Hook Capacity 80 tons
Auxiliary Hook Capacity 30 tons
A1.9.7 Tailrace
The turbines release water through elbow type draft tubes directly into the river channel. The
Great Falls Reservoir downstream, with normal reservoir level at elevation 355.8 ft msl, extends
to the plant and forms the tailwater.
Table A1.9-5. Fishing Creek Tailrace Features
Feature Description
Type Excavated channel
Length 270 ft
Normal Tailwater Elevation 355.8 ft msl
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Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.9.8 Other Structures
Accessory electrical equipment includes items typical for any hydro station: generator circuit
breakers, control cabinets, relay boards, station service transformers, batteries, and the customary
protective devices.
A1.9.9 Impoundment
Fishing Creek Reservoir is located in Lancaster and Chester Counties, South Carolina. Its
headwaters lie approximately 25 mi below Wylie Dam, and it has approximately 85.1 mi of
shoreline and covers approximately 3,431 acres (full pond contour 417.2 ft msl). Fishing Creek
Reservoir was completed in 1916.
Table A1.9-6. Fishing Creek Impoundment
Feature Description
Maximum Water Surface 417.2 ft
Normal Maximum Water Surface 417.2 ft
Normal Minimum Water Surface 412.2 ft
Drainage Area 3,810 sq. miles
Shoreline Length 85.1 miles
Estimated Gross Capacity of Fishing Creek Reservoir 48,800 ac-ft
Contrary to the name of the facility, the drainage basin of the reservoir does not include Fishing
Creek, which passes to the west of the dam.
A1.9.10 Bypassed Reaches
There are no bypassed reaches associated with the Fishing Creek Development.
A1.9.11 Turbine/Generators
The Fishing Creek Powerhouse contains five vertical axis, Francis type turbines with
synchronous AC generators. The normal operating gross head with all five units generating at
peak efficiency is 61.0 feet. For a corresponding estimated net head of 59.0 ft including water
conveyance system head losses, the generating units have the following performance:
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Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Turbine Output
Turbine Output
Turbine Output
Units 1 & 4
Peak Efficiency
14,500 HP
Units 2 & 3
Peak Efficiency
12,440 HP
Unit 5
Peak Efficiency
11,200 HP
Units 1 & 4 Generator Rating: 10,530 kW @ 0.9 pf; 11,700 kVA
Units 2, 3 & 5 Generator Rating: 9,450 kW @ 0.9 pf; 10,500 kVA
The authorized installed capacity as defined by 18CFR§ 11.1(i) is 48.12 MW.
At full gate and the normal operating gross head, the five turbines have an estimated maximum
hydraulic capacity of 12,208 cfs. A summary of major turbine/generator characteristics is
provided in the table below.
A digital hydraulic governor controls each turbine through servomotor -operated wicket gates.
The governor receives its speed indication from a speed sensor mounted on the turbine shaft. The
governor oil pressure is supplied by a governor hydraulic package consisting of two 15-HP, AC
motor -driven, positive displacement pumps with a nitrogen gas pressure accumulator. The two
governor motor -pumps are redundant and alternate in lead -lag sequence under normal operation
to equalize load.
Each turbine has one headgate to provide unit isolation for dewatering and maintenance. One AC
motor drives the line shaft for all the headgates. Each headgate has a drive system that is
connected to the line shaft by clutches. A handwheel is provided for manual operation of each
headgate.
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Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Each turbine is direct connected to a vertical shaft, air-cooled generator. A single Kingsbury
thrust bearing carries the thrust load for both the turbine and generator. The thrust bearing is
located above the generator rotor in the thrust tub on top of the generator bridgetree. Generator
neutrals are grounded through a resistor. The original direct -driven exciters are retired. New
static exciters are connected to the generator field brush assemblies. Constant pressure brushes
are installed.
Plant controls reside in PLCs located at the station. Local, manual controls are available at each
unit. Control may be exercised from a computer screen in the plant control room or remotely
from the Regulated Renewables Operations Center in Charlotte, NC.
A1.9.12 Primary Transmission Lines in the Project
There are no primary transmission lines within the Fishing Creek Project Boundaries.
A1.9.13 Switchyards
The step-up transformers, circuit breakers, and other switching equipment are located in an
outdoor switchyard on the abutment hillside approximately 100 ft downstream from the
powerhouse building. Two step-up transformers interconnect the powerhouse to the 100 kV
transmission system. One is rated at 37.3 MVA, with forced -air cooling, three-phase. The other
is rated at 25 MVA with forced -air cooling, three phase.
A1.9.14 Federal Lands
There are no federal lands within the Fishing Creek Project Boundaries.
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Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
A1.10 Great Falls -Dearborn Development
A1.10.1 Overview
The Great Falls -Dearborn hydroelectric facilities are located in Chester County, South Carolina, 3
miles downstream of the Fishing Creek hydropower facility on a reach of the Catawba River
characterized by a bifurcation in the river channel (Figure E1.1-9). The hydropower facilities
began commercial operation in April 1907 and March 1923, respectively.
A1.10.2 Dams
The Great Falls -Dearborn Dam, supplied with water from the Great Falls Reservoir via a canal
from the headworks, consists of two powerhouses with separate intake structures and bulkheads.
The bulkheads are mass concrete, non -overflow structures. The Great Falls Powerhouse
bulkhead, approximately 675 ft long, extends the full width of the canal and ties into the west
abutment (right bank of canal) and the Dearborn Powerhouse. The Dearborn Powerhouse
bulkhead, which ties into the east abutment (left bank of canal), is approximately 160 ft long.
The top elevation of the bulkheads is at elevation 365.9 ft msl. The maximum height of the dam
is 103 ft. The only flows from the Great Falls -Dearborn Dam consist of turbine releases.
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Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.10-1. Great Falls -Dearborn Dam Features
Feature Description
Location South end of Great Falls Reservoir; Chester County, SC
Type Concrete gravity
Height 103 ft
Crest Elevation 365.9 ft msl
A1.10.3 Spillways
The Mountain Island Diversion Spillway is located approximately 1,500 ft downstream of the
Fishing Creek Dam. The diversion spillway is 1,500 ft long with a crest elevation of 355.8 ft msl.
It diverts the flow of the Catawba River to a canal parallel to and west of the original Catawba
River channel.
The canal headworks, located 1.4 mi upstream of the Great Falls and Dearborn P owerhouses,
mark the boundary between the Great Falls Reservoir and the canal that feeds water to the Great
Falls and Dearborn Powerhouses. The headworks include a trash rack structure for the canal
intake and two mass concrete overflow spillways. The main spillway is upstream of the
headworks and the canal spillway is immediately downstream of the headworks. The canal
spillway is equipped with flashboards, and the elevation of the top of the flashboards, 355.8 ft
msl, is the same elevation as the crest of the main spillway. Flow into the canal leading to the
powerhouses is regulated by submerged openings in the canal intake structure. Floodwater is
released to the Catawba River by these two spillways and the upstream diversion spillway.
Table A1.10-2. Great Falls -Dearborn Spillway Features
Feature Description
Type Concrete Ogee overflow
CREST ELEVATION
Great Falls Diversion 355.8 ft msl
Main Spillway 355.8 ft msl
Canal Spillway 351.8 ft msl, Ogee; 355.8 ft msl, top of
flashing
LENGTH
Great Falls Diversion 1,500 ft
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Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Main Spillway
Canal Spillway
Control
Gate Hoist Type
Gate Control Location
Release at Elevation 365.8 ft msl
443 ft
540 ft
Wood flashing at canal spillway
None
None
335,846 cfs
A1.10.4 Intakes
The Great Falls intake and bulkhead are integral structures constructed from reinforced and mass
concrete. There are nine separate intakes; one for each turbine, and one for the exciter unit. Each
intake has a set of structural steel trash racks. The intakes are lined with riveted steel plates that
form the water chest surrounding the twin horizontal runners.
Table A1.10-3. Great Falls Intake Features
Feature
Description
Type
Control
Gate Hoist Type
Number and Size of Openings
Trash Rack Bar Size
Trash Rack Bar Spacing
Rack Cleaning
Bypass Valves
Concrete with riveted steel lining
Structural steel reinforced vertical lift gates; eight for the
turbines, and one for the exciter
Individual vertical lift rack gear type, motor operated from
line shaft
Eight 16-ft wide by 18.5 ft high oval
One 6-ft wide by 9 ft high oval
4 inch wide by 0.375 inch thick
2.4 inch
None
Nine 9-inch wide by 12 in high vertical lift steel gates
The Dearborn intake and powerhouse are integral structures constructed from reinforced and
mass concrete sandwiched between the left end of the spillway and the left non -overflow
bulkhead. There are three separate intakes, one for each turbine. Each intake has two sets of
structural steel trash racks. There are a total of six horizontal butterfly Lee type headgates and
frames. The headgates are constructed from cast iron and steel, and are operated by six vertical
screw type stems that are motor operated. Each unit has a 24-inch diameter headgate bypass
sluice gate with a manual floor stand operator.
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Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.10-4. Dearborn Intake Features
Feature
Description
Type
Gate Hoist Type
Number and Size of Openings
Trash Rack Bar Size
Trash Rack Bar Spacing
Rack Cleaning
Bypass Valves
Six horizontal butterfly Lee type
Individual vertical lift screw type, motor operated
Six 15.5-ft wide by 21.5 ft high
4 inch wide by 0.375 inch thick
3 inch
None
Three 24-inch diameter vertical lift cast iron sluice
gates
A1.10.5 Water Conveyance
A forebay canal approximately 7,250 ft long extends from the canal headworks to the intake
structures of the two powerhouses. The canal was formed by improvement of existing
topography between the canal headworks and the powerhouses. The improvements include an
earth fill (saddle dike) in a low area along the canal' s eastern rim, approximately 1,300 feet
downstream of the canal spillway. The saddle dike is approximately 450 feet long with a
maximum height of approximately 50 feet. The remainder of the canal is retained by natural
topography. The Dearborn Station was constructed on the east bank, downstream from and at a
45° angle with the Great Falls Powerhouse. In order to construct it, an auxiliary forebay
approximately 80 ft wide at the bottom was excavated around the east end of the Great Falls
Powerhouse headworks.
For both stations, the scroll case intakes are an integral part of the powerhouse structure, without
independent penstocks or flumes. Both intakes have racks and headgates.
A1.10.6 Powerhouse
The principal structure of the Great Falls Powerhouse is a concrete gravity intake structure,
closing off the forebay canal. Its maximum height is approximately 87 ft. It was originally
approximately 745 ft long at the crest, but approximately 68 ft was removed from the east end for
construction of the Dearborn Station. It contains the scroll case inlets, the turbine casings, and
the draft tubes, all with plate steel liners. The generators are carried by concrete arch construction
over the upper end of the tailrace. The powerhouse superstructure is of wall bearing, brick
A-64

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
construction, with steel roof trusses. Exposed concrete is faced with stone masonry. A 30-ton
bridge type crane is provided.
Table A1.10-5. Great Falls Powerhouse Features
Feature Description
STRUCTURE
Type Indoor, above ground powerhouse
Construction Reinforced cast -in -place concrete substructure and
floor
Steel frame with brick walls above generator floor
FEATURES
Turbines Eight horizontal shaft, twin runner, Francis type
Generators Eight horizontal shaft, waterwheel type, direct
connected
CONTROL ROOM
Location Local control room is in the powerhouse
ANCILLARY EQUIPMENT
Overhead Crane Type
Main Hook Capacity
Traveling Bridge, Whiting
30 tons
The Dearborn Powerhouse structures consist of a concrete gravity bulkhead structure 48.5 ft long,
tying into the intake structure of the Great Falls Powerhouse; a concrete intake and powerhouse
structure 161 ft long; and a concrete gravity bulkhead structure 160 ft long, tying into the hillside.
The powerhouse superstructure is of steel frame and brick construction. A 100-ton bridge type
crane is provided.
Table A1.10-6. Dearborn Powerhouse Features
Feature Description
STRUCTURE
Type
Indoor, aboveground powerhouse
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Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Feature Description
Construction
Reinforced cast -in -place concrete substructure and
floor
Steel frame with brick walls above generator floor
FEATURES
Turbines Three vertical axis, Francis type
Generators Three vertical shaft, waterwheel type, direct
connected above turbines
CONTROL ROOM
Location Local control room is in the right end of the
powerhouse
ANCILLARY EQUIPMENT
Overhead Crane Type Traveling Bridge, Whiting
Main Hook Capacity 100 tons
Auxiliary Hook Capacity 30 tons
A1.10.7 Tailrace
For both stations, the turbines release water through elbow type draft tubes into an excavated
tailrace. The Cedar Creek Reservoir downstream, with a normal full pond elevation of 284.4 ft
msl, extends to the Station and forms its tailwater.
Table A1.10-7. Great Falls Tailrace Features
Feature Description
Type Excavated channel
Length 1,600 ft
Normal Tailwater Elevation 284.4 ft msl
Table A1.10-8. Dearborn Tailrace Features
Feature Description
Type Excavated channel
Length 400 ft
Normal Tailwater Elevation 284.4 ft msl
A-66

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.10.8 Other Structures
A structural steel trash gate with frame and screw type hoist is located at the right end of the
Dearborn bulkhead.
Accessory electrical equipment includes items typical for any hydro station: generator circuit
breakers, control cabinets, relay boards, station service transformers, batteries, and the customary
protective devices.
A1.10.9 Impoundment
The Great Falls Reservoir is located downstream of the Fishing Creek Reservoir, in Chester and
Lancaster Counties, South Carolina. With approximately 13.1 mi of shoreline, the reservoir
covers approximately 353 acres (full pond contour 355.8 ft msl). The Great Falls Reservoir was
completed in 1907.
Table A1.10-9. Great Falls -Dearborn Impoundment
Feature Description
Maximum Water Surface 355.8 ft msl
Normal Maximum Water Surface 355.8 ft msl
Normal Minimum Water Surface 350.8 ft msl
Drainage Area 4,100 sq. miles
Shoreline Length 13.1 miles
Estimated Gross Capacity of Great Falls -Dearborn
Reservoir 1,700 ac-ft
A1.10.10 Bypassed Reaches
There are two bypassed reaches associated with the Great Falls -Dearborn Development. The
Great Falls Long Bypassed Reach (Great Falls Diversion Dam side) is approximately 2.25 miles
long, and runs along the east side of Mountain Island. The Great Falls Short Bypassed Reach
(Great Falls Headworks) is approximately 0.75 mile long, and runs along the west side of
Mountain Island.
A-67

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.10.11 Turbine/Generators
Great Falls Turbine/Generator
The Great Falls Powerhouse originally contained eight horizontal -axis, Francis type turbines with
synchronous AC generators. The New License issued November 25, 2015 required Duke Energy
to decommission Units 3,4,7, and 8 which will remain in the powerhouse post -decommissioning
due to their historic significance. Decommissioning was completed on Units 3, 4, 7, and 8 in June
2020. These units have been dewatered by closing the headgates and placing concrete in the
intake conveyance passages up to the top of the scroll cases.
The normal operating gross head with units at Great Falls generating at peak efficiency is 71.0 ft.
For a corresponding estimated net head of 69.0 ft including water conveyance system head losses,
the generating units have the following performance:
Units 1 & 2
Peak Efficiency
Turbine Output 5,200 HP
Turbine Output
Turbine Output
Unit 6,
Peak Efficiency
4,360 HP
Unit 5
Peak Efficiency
5,060 HP
Units 1 through 8 Generator Rating: 3,000 kW @ 0.8 pf; 3,750 kVA
The authorized installed capacity as defined by 18CFR§ 11.1(i) is 12.0 MW.
At full gate and the maximum normal operating gross head of 71 ft, the four main turbines have
an estimated maximum hydraulic capacity of 3,314 cfs. Each turbine is direct connected to a
horizontal shaft, air-cooled generator.
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Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Dearborn Turbine/Generator
The Dearborn Powerhouse contains three vertical -axis, Francis type turbines with synchronous
AC generators. The normal operating gross head with units at Dearborn generating at peak
efficiency is 71.0 feet. For a corresponding estimated net head of 69.0 ft including water
conveyance system head losses, the generating units have the following performance:
Turbine Output
Peak Efficiency
18,667 HP
Generator Rating: 15,000 kW @ 0.8 pf; 18,750 kVA
The authorized installed capacity as defined by 18 CFR§ 11.1(i) is 42.0 MW.
At full gate and the normal operating gross head of 71 ft, the three turbines have a maximum
hydraulic capacity of 9,111 cfs.
A digital hydraulic governor controls each turbine through servomotor -operated wicket gates.
The governor receives its speed indication from a permanent magnet generator mounted on the
turbine shaft. The governor oil pressure is supplied by an AC motor -driven, positive
displacement pump.
Each turbine has two butterfly Lee type headgates to provide unit isolation for dewatering and
maintenance. Each headgate has an AC motor to open and close the headgate. A handwheel is
provided for manual operation of each headgate.
Each turbine is direct connected to a vertical shaft, air-cooled generator. A single Kingsbury
thrust bearing carries the thrust load for both the turbine and generator. The thrust bearing is
located above the generator rotor in the thrust tub on top of the generator bridgetree. Generator
neutrals are grounded through a resistor.
Plant controls reside in PLCs located at the station. Local, manual controls are available at each
unit. Control may be exercised from a computer screen in the plant control room or remotely
from the Regulated Renewables Operations Center in Charlotte, NC.
A-69

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.10.12 Primary Transmission Lines in the Project
A 0.13-mile-long 100-kV transmission line and a 0.8-mile long 44-kV transmission line leading
to the Great Falls Switching Station. Two 0.2-mile-long, 44-kV transmission lines leading to the
to the Great Falls Switching Station.
A1.10.13 Switchyards
Four step-up transformers for the Great Falls Powerhouse with switching devices are housed in a
building constructed over the tailrace just downstream from the main generator room. The
construction is similar to that described above for the main powerhouse. Each of the four
transformers is rated at 9.33 MVA, with convection air cooling, three-phase. Power is conducted
overhead to an outdoor 44 kV switching station on the west bank of the tailrace and
approximately 200 ft downstream from the powerhouse. The switching station is a part of the
system transmission system.
Step-up transformers for Dearborn Unit 1 are located on a deck at generator floor level and
immediately downstream from the generator room. The Unit 1 transformer bank consists of two
parallel 44 kV transformers, each rated at 10 MVA, with forced -air cooling, three-phase. A single
100 kV step-up transformer for the combined output of Units 2 and 3 is located immediately east
of the powerhouse. This three-phase transformer is rated at 41.67 MVA, with forced air. Power
is conducted overhead at high voltage to the outdoor switching station located on the west bank,
described above.
A1.10.14 Federal Lands
There are no federal lands within the Great Falls -Dearborn Project Boundaries.
A-70

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
A1.11 Rocky Creek -Cedar Creek Development
akiws-
A1.11.1 Overview
The Rocky Creek -Cedar Creek hydropower facilities are located approximately 2 miles southeast
of the Town of Great Falls, South Carolina, at the confluence of Rocky Creek with the Catawba
River. The confluence marks the end of a bifurcation in the Catawba River that begins 1,500 ft
downstream of the Fishing Creek Dam. The Rocky Creek Powerhouse lies on the right (west)
bank of the river in Fairfield County, South Carolina, while the Cedar Creek powerhouse lies on
the left (east) bank of the river in Lancaster County, South Carolina (Figure E1.1-9).
The Rocky Creek hydropower facility started commercial operation shortly after April 1909,
while the Cedar Creek hydropower facility started commercial operation in August 1926.
A1.11.2 Dams
The original Rocky Creek Dam consisted of a concrete gravity overflow spillway 1,025 ft long in
the river channel; a forebay canal perpendicular to the main dam on the west bank, 60 ft wide at
the bottom and approximately 500 ft long; a concrete gravity overflow spillway 213 ft long at the
upper end of the forebay canal; and a concrete gravity bulkhead section approximately 450 ft
long, forming the remainder of the river wall for the forebay canal and the intake structure for the
powerhouse. The top of the powerhouse bulkhead was raised 5 ft after the July 1916 flood.
A-71

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
The Cedar Creek Station was built in 1926 by removing 160 ft of the original dam at the east
bank, excavating a 250-ft long forebay canal perpendicular to the old dam, and constructing new
spillway structures and a new powerhouse. At that time, 14-inch high flashboards were removed
and the crest of the original spillway raised 3 ft to its present elevation of 284.4 ft msl.
The Rocky Creek intake, powerhouse, and bulkhead are at elevation 306.4 ft msl, while the Cedar
Creek Powerhouse intake deck is 4 ft lower at elevation 302.4 ft msl. The maximum height of the
dam is approximately 69 ft. The Cedar Creek Powerhouse and bulkhead are at elevation 308.4 ft
msl. During 2002 dam rehabilitation work, floodwalls were added, raising the top elevation to
313.6 ft msl.
Table A1.11-1. Rocky Creek -Cedar Creek Dam Features
Feature Description
Location South end of Cedar Creek Reservoir; Fairfield
and Lancaster Counties, SC
Type Concrete gravity
Height 69 ft
Crest Elevation 313.6 ft msl maximum, 302.4 ft msl minimum
A1.11.3 Spillways
The U-shaped spillway consists of a concrete gravity overflow spillway 808 ft long, bounded by a
130 ft section of concrete gravity overflow spillway on the east end and a 213-ft long concrete
gravity overflow spillway on the west end. Additionally, the east side of the spillway, which
forms the forebay canal to the Cedar Creek intake, is fitted with two Stoney type floodgates, 25 ft
high by 45 ft clear width. The spillway crest is at elevation 284.4 ft msl and the top of the
floodgates is at elevation 286.1 ft msl. Post -tensioned anchors were installed in the spillway
during the dam rehabilitation work performed in 2002 to strengthen the spillway against extreme
flood events.
Table A1.11-2. Rocky Creek -Cedar Creek Spillway Features
Feature Description
Type
Crest Elevation
Concrete Ogee overflow
284.4 ft msl, Ogee, 259.4 ft msl gated Ogee
A-72

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Feature
Description
Length
Control
Gate Hoist Type
Gate Control Location
Release at Elevation 306.4 ft msl
1,154 ft Ogee
Two Stoney type gates, 25 ft high by 45 ft wide
One motor -driven, vertical lift, screw type, traveling
hoist on structural steel runway supported by steel
towers on the gate piers
Spillway gate access walkway
567,700 cfs
A1.11.4 Intake
The intakes at each powerhouse are fed by forebay canals formed by the east and west sides of
the U-shaped spillway. The Rocky Creek intake and bulkhead are integral structures constructed
from reinforced and mass concrete. There are nine separate intakes; one for each turbine, and one
for the exciter unit. Each intake has a set of structural steel trash racks. The intakes are lined
with riveted steel plates that form the water chest surrounding the twin horizontal runners.
Table A1.11-3. Rocky Creek Intake Features
Feature
Description
Type
Control
Gate Hoist Type
Number and Size of Openings
Trash Rack Bar Size
Trash Rack Bar Spacing
Rack Cleaning
Bypass Valves
Concrete with riveted steel lining
Timber vertical lift gates; eight for the turbines, and one
for the exciter
Individual vertical lift rack gear type, motor operated
from line shaft
Eight 18-ft wide by 21.5 ft high oval
One 6-ft wide by 9 ft high oval
4 inch wide by 0.375 inch thick
2.375 inch
Gantry with hydraulic rake arm
Nine 9-inch wide by 12 inch high vertical lift steel gates
The Cedar Creek intake and powerhouse are integral structures constructed from reinforced and
mass concrete sandwiched between the left end of the spillway and the left non -overflow
bulkhead. There are three separate intakes, one for each turbine. Each intake has two sets of
structural steel trash racks. There are a total of six horizontal butterfly Lee type headgates and
A-73

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
frames. The headgates are constructed from cast iron and steel, and are operated by six vertical
screw type stems that are motor operated. Each unit has a 30-in diameter headgate bypass sluice
gates with manual floor stand operator.
Table A1.11-4. Cedar Creek Intake Features
Feature Description
Type Six horizontal butterfly Lee type
Gate Hoist Type Individual vertical lift screw type, motor operated
Number and Size of Openings Six 17.8-ft wide by 24.8 ft high
Trash Rack Bar Size 4 inch wide by 0.375 inch thick
Trash Rack Bar Spacing 4.5 inches
Rack Cleaning None
Bypass Valves Three 30-inch diameter vertical lift cast iron sluice gate
A1.11.5 Water Conveyance
The intake and powerhouse structures are an integral part of the dams, without independent
penstocks or flumes. The turbines release through elbow type draft tubes into a tailrace excavated
in the river channel.
A1.11.6 Powerhouses
The principal structure of the Rocky Creek Powerhouse is a concrete gravity intake structure,
closing off the intake canal. It contains the scroll case inlets, the turbine casings, and the draft
tubes, all with plate steel liners. The generators are carried by concrete arch construction over the
upper end of the tailrace. The powerhouse superstructure is of wall bearing, brick construction
with steel roof trusses. A 30-ton bridge type crane is provided.
Table A1.11-5. Rocky Creek Powerhouse Features
Feature Description
STRUCTURE
Type Indoor, aboveground powerhouse
Construction Reinforced cast -in -place concrete substructure and
floor
Steel frame with brick walls above generator floor
A-74

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Feature Description
FEATURES
Turbines Eight horizontal shaft, twin runner, Francis type
Generators Eight horizontal shaft, waterwheel type, direct
connected
CONTROL ROOM
Location Local control room is in the powerhouse
ANCILLARY EQUIPMENT
Overhead Crane Type
Main Hook Capacity
Traveling Bridge, Whiting
30 tons
The Cedar Creek Powerhouse has a reinforced concrete substructure with a steel frame and brick
superstructure. A 100-ton bridge type crane is provided on -site.
Table A1.11-6. Cedar Creek Powerhouse Features
Feature Description
STRUCTURE
Type Indoor, aboveground powerhouse
Construction Reinforced cast -in -place concrete substructure and
floor
Steel frame with brick walls above generator floor
FEATURES
Turbines Three vertical axis, Francis type
Generators Three vertical shaft, waterwheel type, direct
connected above turbines
CONTROL ROOM
Location Local control room is in the left end of the
powerhouse
ANCILLARY EQUIPMENT
Overhead Crane Type Traveling Bridge, Whiting
A-75

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Feature Description
Main Hook Capacity 100 tons
Auxiliary Hook Capacity 30 tons
A1.11.7 Tailrace
Lake Wateree downstream, with normal full pond at elevation 225.5 ft msl, extends to the stations
and forms their tailwater.
Table A1.11-7. Cedar Creek Tailrace Features
Feature Description
Type Excavated channel
Length 480 ft
Normal Tailwater Elevation 225.5 ft msl
A1.11.8 Other Structures
Rocky Creek has a 20-inch diameter sluice gate bypass with motor -operated screw type lift.
Accessory electrical equipment includes that typical for any hydro station: generator circuit
breakers, control cabinets, relay boards, station service transformers, and the customary
protective devices. Cedar Creek has a structural steel trash gate with frame and screw type hoist.
A1.11.9 Impoundment
The Cedar Creek Reservoir is located downstream of the Great Falls Reservoir, in Chester,
Lancaster, and Fairfield Counties, South Carolina. With approximately 23.2 mi of shoreline, the
Cedar Creek Reservoir covers approximately 748 acres (full pond contour 284.4 ft msl). The
Cedar Creek Reservoir was completed in 1909.
Table A1.11-8. Cedar Creek Impoundment
Feature Description
Maximum Water Surface (Full Pond) 284.4 ft msl
Normal Maximum Water Surface 284.4 ft msl
Normal Minimum Water Surface 280.4 ft msl
Drainage Area 4,360 sq. miles
Shoreline Length 23.2 miles
A-76

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Estimated Gross Capacity of Cedar
Creek Reservoir 7,900 ac-ft
A1.11.10 Bypassed Reaches
There are no bypassed reaches associated with the Rocky Creek -Cedar Creek Development.
A1.11.11 Turbine/Generators
Rocky Creek Turbine/Generators
The Rocky Creek Powerhouse originally contained eight horizontal -axis, twin -runner, and
Francis type turbines with synchronous AC generators. The New License issued November 25,
2015 required Duke Energy to decommission Units 1, 2, 3, and 4 which will remain in the
powerhouse post -decommissioning due to their historic significance. The decommissioning plan
subsequently approved by FERC on June 15, 2017 authorized the decommissioning of all eight
units within the Rocky Creek Powerhouse. This work is currently underway.
The normal operating gross head with units at Rocky Creek generating at peak efficiency is 60.0
ft. For a corresponding estimated net head of 58.0 ft including water conveyance system head
losses, the generating units have the following performance:
Units 7 & 8
Peak Efficiency
Turbine Output 4,187 HP
Turbine Output
Units 5 & 6
Peak Efficiency
5,200 HP
Units 7 & 8 Generator Rating: 3,000 kW @ 1 pf; 3,000 kVA
Units 5 & 6 Generator Rating: 4,500 kW @ 0.9 pf; 5,000 kVA
The authorized installed capacity as defined by 18CFR§ 11.1(i) is 13.8 MW.
At full gate and normal gross head, the four main turbines have a maximum hydraulic capacity of
3,808 cfs. Each turbine is direct connected to a horizontal shaft, air-cooled generator. Each
generator has a static excitation system powered from the generator side of the switchgear.
A-77

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Cedar Creek Turbine/Generators
The Cedar Creek Powerhouse contains three vertical axis, Francis type turbines with synchronous
AC generators. The normal operating gross head with units at Cedar Creek generating at peak
efficiency is 60.0 ft. For a corresponding estimated net head of 58.0 ft including water
conveyance system head losses, the generating units have the following performance:
Turbine Output
Units 1, 2 & 3
Peak Efficiency
19,100 HP
Unit 1 Generator Rating: 15,000 kW @ 0.8 pf; 18,750 kVA
Units 2 & 3 Generator Rating: 18,000 kW @ 0.9 pf; 20,000 kVA
The authorized installed capacity as defined by 18CFR§ 11.1(i) is 42.975 MW. At full gate and
the normal operating gross head, the three turbines have an estimated maximum hydraulic
capacity of 10,716 cfs. The runners for Units 2 and 3 include hub -venting capability for
dissolved oxygen enhancement.
A digital hydraulic governor controls each turbine through servomotor -operated wicket gates.
The governor receives its speed indication from a speed sensor mounted on the turbine shaft. The
governor oil pressure is supplied by a governor hydraulic package consisting of two 15-HP, AC
motor -driven, positive displacement pumps with a nitrogen gas pressure accumulator. The two
governor motor -pumps are redundant and alternate in lead -lag sequence under normal operation
to equalize load.
Each turbine has two butterfly Lee type headgates to provide unit isolation for dewatering and
maintenance. Each headgate has an AC motor to open and close the headgate. A handwheel is
provided for manual operation of each headgate.
Each turbine is direct connected to a vertical shaft, air-cooled generator. A single Kingsbury
thrust bearing carries the thrust load for both the turbine and generator. The thrust bearing is
located above the generator rotor in the thrust tub on top of the generator bridgetree. Generator
neutrals are grounded through a resistor.
A-78

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Plant controls reside in PLCs located at the station. Local, manual controls are available at each
unit. Control may be exercised from a computer screen in the plant control room or remotely
from the Regulated Renewables Operations Center in Charlotte, NC.
A1.11.12 Primary Transmission Lines in the Project
Two 2.0-mile long, 100-kV transmission lines extending from the switching station at the Cedar
Creek Powerhouse to the Great Falls switching station.
A1.11.13 Switchyards
Four step-up transformers for the Rocky Creek Powerhouse, with switching devices, are used to
feed power into the 44-kV transmission systems. Housed in a building constructed over the
tailrace just downstream from the main generator room, each transformer is rated at 10 MVA,
with forced -air cooling, three-phase.
Cedar Creek is served by a switchyard with lattice type -steel structure, located immediately
adjacent to its powerhouse. Step-up transformers, circuit breakers, and other switching
equipment are located in this yard. Three step-up transformers interconnect the powerhouse to
the 100 kV transmission system, each rated at 25 MVA, with forced -air, three-phase.
A1.11.14 Federal Lands
There are no federal lands within the Rocky Creek -Cedar Creek Project Boundaries.
A-79

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
A1.12 Wateree Development
A1.12.1 Overview
The Wateree hydropower facility's principal structures include a powerhouse with an integral
intake structure, an uncontrolled spillway, a bulkhead, and an earthen embankment approximately
1,175 ft long having a crest elevation of 257.5 ft msl. In 2002, a rolled earth fill buttress was
constructed on the downstream side of the earthen embankment up to elevation 230 ft msl. This
buttress provides strengthening for seismic loading conditions. The Wateree hydroelectric
facility is located on the Wateree River in Kershaw County, South Carolina, approximately 8
miles northwest of Camden, South Carolina, and approximately 28 miles northeast of Columbia,
South Carolina (Figure E1.1-10). The hydropower facility began commercial operation in
October 1919.
A1.12.2 Dam
The bulkhead is a concrete gravity non -overflow structure approximately 390 ft long with a top
elevation of 249.5 ft msl, tying the powerhouse with the earthen embankment on the west (right)
bank of the river. In 2001, a floodwall was added on the bulkhead, raising the top elevation to
approximately 254 ft msl. The maximum height of the dam is approximately 76 ft.
A-80

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.12-1. Wateree Dam Features
Feature Description
Location
Type
Height
Crest Length
Crest Elevation
Crest Width
Southern end of Lake Wateree; Kershaw County, SC
Semi -hydraulic fill earth and concrete gravity
76 ft
1,753 ft
257.5 ft msl maximum, 254 ft msl minimum
10 ft
A1.12.3 Spillways
The spillway is a mass concrete Ogee structure that is tied into the rock abutment at the east bank
and the powerhouse on the west bank. The spillway has a crest elevation of 225.5 ft msl and is
approximately 1,450 ft long, including a 450-ft-long gated section. The gated section comprises
three bottom -hinged, 4.5-ft-high steel gates raised and lowered by inflatable bladders, with each
150-ft-long span able to be operated independently. The controls, compressors, and other
associated mechanical and controls equipment are housed in the powerhouse adjacent to Unit 5.
Table A1.12-2. Wateree Spillway Features
Feature
Description
Type
Fixed Crest Elevation
Length (Total)
Length (Gated)
Control
Top of Gate Elevation
Crest Elevation with Gates Lowered
Top of Gate Piers
Gate Hoist Type
Gate Control Location
Release at Maximum Water Elevation
Concrete Ogee overflow
225.5 ft msl
1,450 ft
450 ft
3 bottom -hinged gates
225.5 ft
221 ft
226.50 ft
(229.00 ft at East Abutment)
Inflatable bladder
Powerhouse
775,000 cfs (total spillway)
10,000 cfs (gate spans)
A-81

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
A1.12.4 Intake
The intake and powerhouse are integral structures constructed from reinforced and mass concrete
sandwiched between the right end of the spillway and the right non -overflow bulkhead. There are
five separate intakes, one for each turbine. Each intake has two sets of structural steel trash racks.
There are a total of ten vertical lift headgates, two per intake, that are motor operated by vertical
screw type stems. The headgates are constructed from structural steel trusses and skin plate, and
are filled with concrete. Each unit has a 30-inch diameter headgate bypass sluice gate with
motorized floor stand operator.
Table A1.12-3. Wateree Intake Features
Feature
Description
Type
Control
Gate Hoist Type
Number and Size of Openings
Trash Rack Bar Size
Trash Rack Bar Spacing
Rack Cleaning
Bypass Valves
Concrete
Concrete -filled, steel reinforced vertical lift gates
Individual vertical lift screw type, motor operated
from line shaft
Five 18-ft wide by 22 ft high
Five 12-ft wide by 22 ft high
6 inch wide by 0.375 inch thick
4.125 inches
None
Five 30-inch diameter vertical lift cast iron sluice
gates
A1.12.5 Water Conveyance
The intake and powerhouse structures are an integral part of the dam, without independent
penstocks or flumes. The turbines release through elbow type draft tubes into a tailrace excavated
in the river channel
A1.12.6 Powerhouse
The powerhouse consists of a concrete substructure that is an integral part of the intake structure
and spillway. A 100-ton capacity bridge type crane is provided.
A-82

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.12-4. Wateree Powerhouse Features
Feature Description
STRUCTURE
Type Indoor, aboveground powerhouse
Construction Reinforced cast -in -place concrete substructure and
floor
Steel frame with brick walls above generator floor
FEATURES
Turbines Five vertical axis, Francis type
Generators Five vertical shaft, waterwheel type, direct
connected above turbines
CONTROL ROOM
Location Local control room is in the right end of the
powerhouse
ANCILLARY EQUIPMENT
Overhead Crane Type Traveling Bridge, Whiting
Main Hook Capacity 100 tons
Auxiliary Hook Capacity 30 tons
A1.12.7 Tailrace
Draft Tube Gates are not required, as turbine runners are above normal tailwater.
Table A1.12-5. Wateree Tailrace Features
Feature Description
Type Excavated channel
Length 2,700 ft
Normal Tailwater Elevation 147.5 ft msl
A1.12.8 Trap, Sort and Transport Facility and Other Structures
Beginning in 2018, operation of a Trap, Sort and Transport (TST) Facility for upstream passage
of American Shad and Blueback Herring spawning adults above Wateree Dam will occur
annually during their spring spawning runs. The TST Facility is located approximately 1,700 feet
A-83

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
downstream of the Wateree Powerhouse along the west side of the tailrace and includes the
seasonal deployment (generally March through May) of a portable Alaskan Steeppass Model "C"
as the trapping mechanism (steeppass), guide panels suspended from floats to divert migrating
fish towards the steeppass entrance, walkway ramp for personnel, and hopper/rail conveyor to
transport captured fish from the steeppass up to a trailered holding tank.
Accessory electrical equipment includes items typical for any hydro station: generator circuit
breakers, control panels, station service transformers, batteries, and the customary protective
devices.
A1.12.9 Impoundment
Lake Wateree is the most -downstream lake on the Catawba-Wateree Project. It is located in
Lancaster, Kershaw, and Fairfield Counties, South Carolina. With approximately 214.9 mi of
shoreline, Lake Wateree covers approximately 13,025 acres (full pond contour 225.5 ft msl).
Lake Wateree was completed in 1920.
A-84

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
Table A1.12-6. Wateree Impoundment
Feature Description
Maximum Water Surface (Full Pond) 225.5 ft msl
Normal Maximum Water Surface 225.5 ft msl
Normal Minimum Water Surface 218.5 ft msl
Drainage Area 4,750 sq. miles
Shoreline Length 214.9 miles
Estimated Gross Capacity of Lake Wateree 183,860 ac-ft
Reservoir
A1.12.10 Bypassed Reaches
There is a short, 2,000-ft bypassed reach immediately below the spillway.
A1.12.11 Turbine/Generators
The Wateree Powerhouse contains five vertical axis, Francis type turbines that drive synchronous
AC generators. The normal operating gross head with all five units at Wateree generating at peak
efficiency is 75.5 ft. For a corresponding estimated net head of 74.0 feet including water
conveyance system head losses, the generating units have the following performance:
Turbine Output
Peak Efficiency
21,867 HP
Units 1 & 5 Generator Rating: 17,100 kW @ 0.95 pf; 18,000 kVA
Units 2 through 4 Generator Rating: 18,050 kW @ 0.95 pf; 19,000 kVA
The authorized installed capacity as defined by 18CFR§ 11.1(i) is 82.0 MW.
At full gate and the normal operating gross head, the five turbines have an estimated maximum
hydraulic capacity of 15,880 cfs. The runners for Units 1 and 3 include turbine auto venting
capability for dissolved oxygen enhancement.
A digital hydraulic governor controls each turbine through servomotor -operated wicket gates.
The governor receives its speed indication from a permanent magnet generator mounted on the
A-85

Duke Energy Catawba-Wateree Project No. 2232
Exhibit A
exciter shaft. The governor oil pressure is supplied by a governor hydraulic package consisting of
two 15-HP, AC motor -driven, positive displacement pumps with a nitrogen gas pressure
accumulator. The two governor motor -pumps are redundant and alternate in lead -lag sequence
under normal operation to equalize load.
Each turbine has two headgates to provide unit isolation for dewatering and maintenance. One
AC motor drives the line shaft for all the headgates. Each headgate has a drive system that is
connected to the line shaft by dog -clutches. There is a second AC motor for backup. A
handwheel is provided for manual operation.
Each turbine is direct connected to a vertical shaft, air-cooled generator. A single Kingsbury
thrust bearing carries the thrust load for both the turbine and generator. The thrust bearing is
located above the generator rotor in the thrust tub on top of the generator bridgetree. Generator
neutrals are grounded through a resistor.
Plant controls reside in PLCs located at the station. Local, manual controls are available at each
unit. Control may be exercised from a computer screen in the plant control room or remotely
from the Regulated Renewables Operations Center in Charlotte, NC.
A1.12.12 Primary Transmission Lines in the Project
There are no primary transmission lines within the Wateree Project Boundaries.
A1.12.13 Switchyards
Step-up transformers are located over the draft tubes on an extension of the generator floor.
Power is transmitted overhead at high tension to a switchyard inshore and approximately 100 ft
downstream from the building. Transformer Bank Two, which connects Units 3 and 4 to the
transmission system is rated at 29.5 MVA, with force -oil and forced -air cooling, three-phase.
Five step-up transformers interconnect the powerhouse to the 100 kV transmission system. Each
is rated at 18.48 MVA, with forced -air-cooling, three-phase.
A1.12.14 Federal Lands
There are no federal lands within the Wateree Project Boundaries.
A-86

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
Figure A1.1-2. Catawba-Wateree Area System Map
Legend
— Rivers
State Boundaries
_ Lakes
I 1
Catavrha-UUa[eree Rivers Basin
11 County Boundaries
ti
.road
•�� •1101e+4
11�.,1.11le
irY dim �"xtre�-mmi,mpt
WI
LINE 0.0307
"rF RM>Colir LS LALCIF
.d4NEY
1111.613,11155.
furl.
_w.wtLry
'� • ouall
•
hYNeNprd
1OrTH CARrJLWA
OLrrli CAROLINA
_ a,e
.b V�Ihopmn �—{
aa�
li'6/d
yolh
Ff 111
ILLY
,.roe,,,
swr i fi.. r.�J L�'..• .
/ Cria
.fiAiJJ J L_ on,
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imp
• nnwwr-^.
MEEK
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• - DI CAR0IJNA
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1.11•1•48U j1fa,�Ir bhp..
1
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30, iI A.I•dl..�
6r, VOISIONFAIIVA
40444104"1/1
4tit&
CA ti,LINA
-
Mil.
DUKE POWER,
CATAWBA-WATEREE AREA
SYSTEM MAP
FigureAl.1-1
0 25 50 75 10D 125
Miles
A-87

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
Figure A11-3. Catawba-Wateree Bridgewater Development — Lake James
Mitchell County
\l
PISGAH
NATIONAL PARS'
Lake James
s 0,
E JAMES STATE PARK
M on MCID DI' CREEK WA
RESTORATION
McDowell County
Burke County
Bridgewater
Powerhouse
dd Creek
Glen Alpine
ENALPIN
RECREATZO ARK
Paddy Creek
Bypassed Reach
Morganto
400A* WI
flab
1
11WIA
4440441R0
Map Location K l \
Legend
Rivers & Streams Parks
Cities 1 Lakes
0
12,000 24,000
Feet
A-88
1
Figure A1.1-2
Catawba-W ateree
Bridgewater Development -
Lake James
Sheet 1 of 1
Base data derived from USGS 7.5-minute series
topographic maps.
Map information was compiled from the best available sources.
No wanany is made for its accumcy and completeness.

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
Figure A1.1-4. Catawba-Wateree Rhodiss Development — Lake Rhodiss
Ga
TUTTLE STATE FOREST
FR TUTTLE STATE
OREST
Dr
el
ell
V7E WMO
T CO M : UMTY PAR
Lend
Cajah's Mountain
Caldwell County
Rhodhiss Lake
MCGALLIAR LI
FALLS PARK
ese
Sawm
Rutherford College
Connelly Springs
Burke County
40
Cedar Rock
OAK- HILL RaiRITANPARK
ite %IIs
hiss Dam
odhi
RHODHISS PA
met
Granite Fal
Hickory
bko
LONG VZEWRECREATIONA
Hildebran 1=i;7;or
BRc
MOUNTAIN VIEW RECRE,
Catawba County
4`mk
reox
4#jp
Map Location
z \
Legend
- Rivers & Streams Parks
_ Cities Lakes
0
12,000 24,000
Feet
Figure A1.1-3
Catawba-W ateree
Rhodhiss Development -
Lake Rhodhiss
Sheet 1 of 1
Base data derived from USGS 7.5-minute series
topographic maps.
Map information was compiled from the best available sources.
No warranty is made for its accuracy and completeness.
A-89

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
Figure A1.1-5. Catawba-Wateree Oxford Development — Lake Hickory
RURITAN PARK
Caldwell County
Gr' ite Falls
Granite
Hilde
Granite Fall
rd
Brookford
MOUNTAIN VIEW
RECREATION CENTER
ak. Hicko
CLAREid •
•
ZIT PARK
aremont
Lt
Alexan
Oxford Powerhouse
r County
xford
Catawba County
uono
on
4.41f4r
iralativ
01111,4"11E14
7444111,14
Map Location
a l \
A
Legend
- Roads Parks
- Rivers & Streams ® Lakes
Cities
0
12,000 24,000
Feet
Figure A1.1-4
Catawba-W ateree
Oxford Development -
Lake Hickory
Sheet 1 of 1
Base data derived from USGS 7.5-minute series
topographic maps.
Map information was compiled from the best available sources.
No warranty is made for its accuracy and completeness.
A-90

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
Figure A1.1-6. Catawba-Wateree Lookout Shoals Development — Lookout Shoals Lake
Alexander County
Iredell County
Lookout Shoals Lake
Lookout Shoals Dam
Conover
aremont
er
Catawba County
Newton
man
States 'Ile
States 'Ile
Statesville
LAKE NORMAN
STATE PARK
*Ada
valefout
‘44414re
Map Location
z ti
Legend
Rivers & Streams
Cities
0
Parks
Lakes
10,000 20,000
Feet
Figure A1.1-5
Catawba-W ateree
Lookout Shoals Development -
Lookout Shoals Lake
Sheet 1 of 1
Base data derived from USGS 7.5-minute series
topographic maps.
Map information was compiled from the best available so es
ra
No wany is made for its accuracy and completeness.
urc
A-91

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
Figure A1.1-7. Catawba-Wateree Cowans Ford Development — Lake Norman
Cawb a
LAKENORMAN
STATE PARK
Catawba County
\
Lake Norman
Lincoln County
EASTLNlCOLN
COUNTY PARK
0owans Ford Powerhouse
Tro an
NOR
Huntersvi
77
C„
Iredell County
Mooresvill
illy / LIBERTY AREA
LLEMUNICIPAL
F COURSE
e Norman
Davidson
Mecklenburg County
BU:: PARK
RAMAH CREEK
0141104& No
Vain"
SININLP-4
44409
Map Location It
A
Legend
— Rivers & Streams
Cities
14,000
Feet
Parks
Lakes
Figure A1.1-6
Catawba-W ateree
Cowans Ford Development -
Lake Norman
Sheet 1 of 1
Base data derived from USGS 7.5-minute series
topographic maps.
Map information was compiled from the best available sows es.
No warranty is made for i6 accuacy and completeness.
A-92

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
Figure A1.1-8. Catawba-Wateree Mountain Island Development — Mountain Island Lake
M
Lincoln County
Gaston County
nley
Cra
of -
Gas onia
GMAT
Mountain Island Powerhouse
BE
DAVIS PAR
Mountain Isla • Dam
Huntersville
Mountain
Island Lake
LATTA PLANTATION
NATURE PARK II
Mountain Island Bypassed Reach
EKBLUFF
enburg County
arlotte
*Not
irillEsmot
ij'Vealk4
4441W410%
Legend
Rivers & Streams Parks
Cities Lakes
1
10,000 20,000
Feet
Figure A1.1-7
Catawba-W ateree
Mountain Island Development -
Mountain Island Lake
Sheet 1 of 1
Base data derived from USGS 7.5-minute series
topographic maps.
Map information was compiled from the best available sows es.
No warranty is made for its accuracy and completeness.
A-93

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
Figure A1.1-9. Catawba-Wateree Wylie Development — Lake Wylie
WBA CREEK
Gastonia
Gaston County
South Carolina
South Carolina
— ark�Coumy
�AV
� reox
-mit MN
At*
Map Location
Legend
- Rivers & Streams Parks
Cities Lakes
1
14,000 28.000
Feet
Figure A1.1-8
Catawba-Wateree
Wylie Development -
Lake Wylie
Sheet 1 of 1
Base data derived from USGS 7.5-minute series
topographic maps.
Map information was compiled from the best available sources.
No womanly is made for its accumcy and completeness.
A-94

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
Figure A1.1-10. Catawba-Wateree Fishing Creek, Great Falls -Dearborn, Rocky Creek -
Cedar Creek Developments — Fishing Creek, Great Falls -Dearborn, Rocky Creek -Cedar
Creek Reservoirs
C 901
Chester
C 901
Fishing Creek Powerhouse
Short Bypassed Reach
Rotary Creek Powerhouse
'shrug C
Lancaster County
t Falls Reservior
Long Bypassed Reach
Great Fall Da :, .• Dam I Great Falls 8 Dearborn Powerhouses
Cedar Creek Powerhouse
Fairfield County
edar C
ocky Creek
eek Reservior
m
Kershaw Cot
Map Location
Legend
- Roads
Coos
1 1
Parks
L akcs
0 11.CJG 22000
Feel
Figure A1.1-9
Catall ba-Wateree
Fishing Creek, Great Falls -Dearborn,
Rocky Creek -Cedar Creek Developments -
Fishing Creek, Great Falls-Dearhorn,
Rocky Creek -Cedar Creek Resenoirs
Sheet 1 of 1
Bose Jurn throrrwl From I.SGS 7.5-m inutc ecri s
topvgrsphic map,
wLL. a•nq�i,l ir..n m= tr.! n.v1 h k.�r.c.
�o winury. nrde for Pis ncucacy and c m,pct:r ,,s
A-95

Duke Energy
Catawba-Wateree Project No. 2232
Exhibit A
Figure A1.1-11. Catawba-Wateree Wateree Development — Lake Wateree
Lancaster
County
LAKE WATEREE STATE PARK
Lake
Wateree
Fairfield County
Richland County
fit‘writip
valailk Alt
OPPIVIIN
Map Location
111
Legend
Rivers & Streams
Cities
Parks
Lakes
14,000 28,000
Feet
Kershaw County
tL
Figure A1.1-10
Catawba-Wateree
Wateree Development -
Lake Wateree
Sheet 1 of 1
Base data derived from USGS 7 5-minute series
topographic maps.
Map information was compiled from the best available sources.
No warranty is made for it accuracy and completeness_
A-96

Duke Energy Carolinas, LLC I Catawba-Wateree Hydroelectric Project (FERC No. 2232)
Consultation Documentation
ATTACHMENT 3
CONSULTATION DOCUMENTATION
January 2023

From: Tarver, Fred
To: Styer, Tami
Subject: Re: [External] FW: Draft Non -Capacity Amendment Application, Rhodhiss Development
Date: Wednesday, January 18, 2023 11:25:34 AM
Thanks Tami for letting me know. No questions. Fred
From: Styer, Tami <[e-mail]>
Sent: Tuesday, January 17, 2023 2:23 PM
To: Tarver, Fred <[e-mail]>; Stancil, Vann F <[e-mail]>;
'Tompkins, Bryan' <[e-mail]>
Cc: Cranford, David F <[e-mail]>; Byrum, Wade M <Wade.Byrum@duke-
energy.com>; Kulpa, Sarah <[e-mail]>; Bennett, Jennifer Wright
<[e-mail]>
Subject: RE: [External] FW: Draft Non -Capacity Amendment Application, Rhodhiss Development
CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an
attachment to Report Spam.
Hi Fred,
Our permitting team consulted with the Corps of Engineers — Brandee Boggs on 11/16/2022
regarding the need for a 404 permit. The Corps determined no 404 permit is required because
there is no dredge and fill associated with the installation of the debris gate. Therefore, no
401 permit (associated with the 404 permit) would be required. Also, there are no permits
required from a buffer standpoint as there is no land disturbance in the buffer associated with
the project. Please let me know if you have questions.
Thank you!
Tami
From: Tarver, Fred <[e-mail]>
Sent: Monday, January 9, 2023 12:51 PM
To: Styer, Tami <[e-mail]>; Stancil, Vann F <[e-mail]>;
'Tompkins, Bryan' <[e-mail]>
Cc: Cranford, David F <[e-mail]>; Byrum, Wade M <Wade.Byrum@duke-
energy.com>; Kulpa, Sarah <[e-mail]>; Bennett, Jennifer Wright
<[e-mail]>
Subject: Re: [External] FW: Draft Non -Capacity Amendment Application, Rhodhiss Development
*** CAUTION! EXTERNAL SENDER *** STOP. ASSESS. VERIFY!! Were you expecting this
email? Are grammar and spelling correct? Does the content make sense? Can you verify the
sender? If suspicious report it, then do not click links, open attachments or enter your ID or
password.
Tami, I have reviewed the attached documents as provided. I have no comments or concerns
as they relate to the proposed installation of a dynamic debris gate on the Rhodhiss Dam crest

other than whether a 401 Certificate is required. You will need to consult with the 401 & Buffer
Permitting Branch on that matter, if you have not already done so. Thank you. Fred Tarver.
From: Styer, Tami <[e-mail]>
Sent: Monday, January 9, 2023 10:41 AM
To: Stancil, Vann F <[e-mail]>; Tarver, Fred <[e-mail]>;
'Tompkins, Bryan' <[e-mail]>
Cc: Cranford, David F <[e-mail]>; Byrum, Wade M <Wade.Byrum@duke-
energy.com>; Kulpa, Sarah <[e-mail]>; Bennett, Jennifer Wright
<[e-mail]>
Subject: [External] FW: Draft Non -Capacity Amendment Application, Rhodhiss Development
CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an
attachment to Report Spam.
Hello all,
Happy New Year! Please recall that I submitted the non -capacity license
amendment application for a small inflatable gate at Rhodhiss to you for
review and comment on November 10, 2022. The 60-day comment period
ends on 1/10. I know the holidays have come and gone since then and
this has probably fallen off the radar so please let me know as soon as
possible if you have comments or questions. I can be reached at
704.641.3832 if you would like to discuss.
Thanks again,
Tami
From: Styer, Tami
Sent: Thursday, November 10, 2022 1:18 PM
To: Stancil, Vann F <[e-mail]>; Fred Tarver ([e-mail])
<[e-mail]>; 'Tompkins, Bryan' <[e-mail]>; Wenonah Haire
<[e-mail]>
Cc: Cranford, David F <[e-mail]>; Byrum, Wade M <Wade.Byrum@duke-
energy.com>; 'Kulpa, Sarah' <[e-mail]>; Bennett, Jennifer Wright
<[e-mail]>; Lineberger, Jeff <[e-mail]>
Subject: Draft Non -Capacity Amendment Application, Rhodhiss Development
Dear Stakeholders:
Duke Energy has attached for your review and comment a draft request for a Non -Capacity
Amendment (NCA) of License for the Catawba-Wateree Hydroelectric Project (Project; FERC No.
2232) for installation of a small inflatable debris gate at the Rhodhiss Development. Currently,
there is an existing debris barrier in place upstream of the Rhodhiss Powerhouse intake which
directs floating debris towards the adjacent ungated spillway. Because this is an overflow spillway,
the organic debris builds up on the spillway before sufficient inflow is present to push it over the
spillway and downstream. To provide passage of upstream debris at the dam, we are proposing to
install a 20-ft-wide debris gate on the spillway adjacent to the intake and powerhouse. The debris

gate will consist of single steel gate, 5.5-ft-high, bottom -hinged, which is raised and lowered by an
inflatable bladder.
The addition of the debris gate to the Rhodhiss Development will provide Duke Energy with a
safer and more effective means of managing debris that presently accumulates on the spillway
and in front of the powerhouse intake trashracks. Existing methods of passing debris is to wait for
the lake level to exceed the full pond elevation (more than 1 ft overtopping) during natural high
inflow events or to schedule a spill event. When inflows are low like they are now, debris must be
pulled from the water manually from a boat upstream of the spillway. This is high -risk work that
can be avoided with the installation of the debris gate.
Duke Energy anticipates construction for installation of the new debris gate to commence in the
third quarter of 2023 and to be complete in the third quarter of 2024.
This non -capacity amendment of license is necessary to align the description of project works and
approved license exhibits to reflect a modification to licensed project works. Installation and
operation of the debris gate will not change licensed Project operations or result in other
modifications of license conditions or project works, and no changes will be made to the FERC
Project boundary for the Rhodhiss Development. A bulkhead will be installed to dewater the
spillway section for gate installation, so no drawdown of the lake is presently proposed for
construction. Construction activities will not result in any new land disturbance.
FERC's regulations under 18 CFR § 4.38(a)(7) require Duke Energy to consult with resource
agencies and Indian tribes, to the extent the proposed amendment would affect their interests.
Duke Energy has completed consultation with the North Carolina State Historic Preservation
Office pursuant to the Project's Historic Properties Management Plan and this consultation is
provided in the draft NCA under Attachment 3. We are not expecting the planned inflatable
spillway gate installation to trigger or necessitate issuance of a revised 401 Water Quality
Certification on behalf of the North Carolina Department of Water Resources (NCDWR), and with
this letter is seeking NCDWR's concurrence.
Attached to this email for your review and comment are the following documents:
1. Draft Non -Capacity Amendment (NCA) of License Application
2. Attachment 1 — Design drawings for the inflatable gate
3. Attachment 2 — Strikethrough Exhibit A - To reduce the size of the document, we are
providing only the revised Exhibit A strikethrough document for the Rhodhiss Development
since it's the only development affected by this NCA application.
4. Attachment 3 — Consultation completed to date (with the NCSHPO)
Comments or questions regarding the proposed Project modification and the Draft Non -Capacity
Amendment Application are due within 60 days of this transmittal (no later than January 10,
2023). We will address any comments received in a final Non -Capacity License Amendment
Application to the FERC.
If you have any questions about this request, please contact me at [e-mail]
or [phone]. Thank you for your attention to this request.
Best regards,
Tami
DUKE
ENERGY

Tami Styer, Senior Project Manager
Regulated and Renewable Energy
Duke Energy
526 S. Church Street/EC12Q
Charlotte, NC 28202
[phone] office

Kulpa, Sarah
From: Stancil, Vann F <[e-mail]>
Sent: Tuesday, January 10, 2023 9:52 AM
To: Bryan_Tompkins; Styer, Tami; Tarver, Fred
Cc: Cranford, David F; Byrum, Wade M; Kulpa, Sarah; Bennett, Jennifer Wright
Subject: RE: [EXTERNAL] FW: Draft Non -Capacity Amendment Application, Rhodhiss
Development
CAUTION: [EXTERNAL] This email originated from outside of the organization. Do not click links or open attachments
unless you recognize the sender and know the content is safe.
Thanks for following up Tami. I've reviewed the application for the inflatable gate at Rhodhiss and don't have any
comments. Thanks for the opportunity to review.
Vann F. Stancil
Research Coordinator
NCWRC Habitat Conservation Division
[e-mail]
919-284-5218
From: Tompkins, Bryan <[e-mail]>
Sent: Tuesday, January 10, 2023 7:05 AM
To: Styer, Tami <[e-mail]>; Stancil, Vann F <[e-mail]>; Tarver, Fred
<[e-mail]>
Cc: Cranford, David F <[e-mail]>; Byrum, Wade M <[e-mail]>; Kulpa,
Sarah <[e-mail]>; Bennett, Jennifer Wright <[e-mail]>
Subject: Re: [EXTERNAL] FW: Draft Non -Capacity Amendment Application, Rhodhiss Development
CAUTION: External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to
Report Spam.
Good morning Tami. Thanks for the reminder on the subject project review.
The USFWS has reviewed the proposed plan and has no comments or recommendations on the scheduled
debris gate construction.
According to our records and a review of the information presented, no listed species or their habitats occur
within the proposed project area. Therefore, we believe the requirements under section 7 of the Act are
fulfilled. However, obligations under section 7 of the Act must be reconsidered if: (1) new information reveals
impacts of this identified action that may affect listed species or critical habitat in a manner not previously
considered, (2) this action is subsequently modified in a manner that was not considered in this review, or
(3) a new species is listed or critical habitat is determined that may be affected by the identified action.
If you need additional information from me or if I can be of assistance in any way, please do not hesitate to
contact me.
In any future correspondence concerning this project, please reference our Log Number 23-015.
Thanks,
Bryan Tompkins
U.S. Fish and Wildlife Service
1

Asheville Field Office
160 Zillicoa Street, Suite B
Asheville, North Carolina 28801
Office: 828/258-3939 ext. 42240
Cell: 828/450-7586
From: Styer, Tami <[e-mail]>
Sent: Monday, January 9, 2023 10:41 AM
To: Stancil, Vann F <[e-mail]>; Fred Tarver ([e-mail]) <[e-mail]>;
Tompkins, Bryan <bryan [e-mail]>
Cc: Cranford, David F <[e-mail]>; Byrum, Wade M <[e-mail]>; Kulpa,
Sarah <[e-mail]>; Bennett, Jennifer Wright <[e-mail]>
Subject: [EXTERNAL] FW: Draft Non -Capacity Amendment Application, Rhodhiss Development
This email has been received from outside of DOI - Use caution before clicking on links, opening attachments, or
responding.
Hello all,
Happy New Year! Please recall that I submitted the non -capacity license amendment
application for a small inflatable gate at Rhodhiss to you for review and comment on
November 10, 2022. The 60-day comment period ends on 1/10. I know the holidays
have come and gone since then and this has probably fallen off the radar so please let
me know as soon as possible if you have comments or questions. I can be reached at
704.641.3832 if you would like to discuss.
Thanks again,
Tami
From: Styer, Tami
Sent: Thursday, November 10, 2022 1:18 PM
To: Stancil, Vann F <[e-mail]>; Fred Tarver ([e-mail]) <[e-mail]>;
'Tompkins, Bryan' <bryan [e-mail]>; Wenonah Haire <[e-mail]>
Cc: Cranford, David F <[e-mail]>; Byrum, Wade M <[e-mail]>; 'Kulpa,
Sarah' <[e-mail]>; Bennett, Jennifer Wright <[e-mail]>; Lineberger, Jeff
<[e-mail]>
Subject: Draft Non -Capacity Amendment Application, Rhodhiss Development
Dear Stakeholders:
Duke Energy has attached for your review and comment a draft request for a Non -Capacity Amendment (NCA) of
License for the Catawba-Wateree Hydroelectric Project (Project; FERC No. 2232) for installation of a small inflatable
debris gate at the Rhodhiss Development. Currently, there is an existing debris barrier in place upstream of the
Rhodhiss Powerhouse intake which directs floating debris towards the adjacent ungated spillway. Because this is an
overflow spillway, the organic debris builds up on the spillway before sufficient inflow is present to push it over the
2

spillway and downstream. To provide passage of upstream debris at the dam, we are proposing to install a 20-ft-
wide debris gate on the spillway adjacent to the intake and powerhouse. The debris gate will consist of single steel
gate, 5.5-ft-high, bottom -hinged, which is raised and lowered by an inflatable bladder.
The addition of the debris gate to the Rhodhiss Development will provide Duke Energy with a safer and more
effective means of managing debris that presently accumulates on the spillway and in front of the powerhouse
intake trashracks. Existing methods of passing debris is to wait for the lake level to exceed the full pond elevation
(more than 1 ft overtopping) during natural high inflow events or to schedule a spill event. When inflows are low like
they are now, debris must be pulled from the water manually from a boat upstream of the spillway. This is high -risk
work that can be avoided with the installation of the debris gate.
Duke Energy anticipates construction for installation of the new debris gate to commence in the third quarter of 2023
and to be complete in the third quarter of 2024.
This non -capacity amendment of license is necessary to align the description of project works and approved license
exhibits to reflect a modification to licensed project works. Installation and operation of the debris gate will not
change licensed Project operations or result in other modifications of license conditions or project works, and no
changes will be made to the FERC Project boundary for the Rhodhiss Development. A bulkhead will be installed to
dewater the spillway section for gate installation, so no drawdown of the lake is presently proposed for construction.
Construction activities will not result in any new land disturbance.
FERC's regulations under 18 CFR § 4.38(a)(7) require Duke Energy to consult with resource agencies and Indian
tribes, to the extent the proposed amendment would affect their interests. Duke Energy has completed consultation
with the North Carolina State Historic Preservation Office pursuant to the Project's Historic Properties Management
Plan and this consultation is provided in the draft NCA under Attachment 3. We are not expecting the planned
inflatable spillway gate installation to trigger or necessitate issuance of a revised 401 Water Quality Certification on
behalf of the North Carolina Department of Water Resources (NCDWR), and with this letter is seeking NCDWR's
concurrence.
Attached to this email for your review and comment are the following documents:
1. Draft Non -Capacity Amendment (NCA) of License Application
2. Attachment 1 — Design drawings for the inflatable gate
3. Attachment 2 — Strikethrough Exhibit A - To reduce the size of the document, we are providing only the
revised Exhibit A strikethrough document for the Rhodhiss Development since it's the only development
affected by this NCA application.
4. Attachment 3 — Consultation completed to date (with the NCSHPO)
Comments or questions regarding the proposed Project modification and the Draft Non -Capacity Amendment
Application are due within 60 days of this transmittal (no later than January 10, 2023). We will address any
comments received in a final Non -Capacity License Amendment Application to the FERC.
If you have any questions about this request, please contact me at Tami.Stver(a.duke-enerqv.com or (704) 641-
3832. Thank you for your attention to this request.
Best regards,
Tami
Arab, DUKE
IV Y.
3

Tami Styer, Senior Project Manager
Regulated and Renewable Energy
Duke Energy
526 S. Church Street/EC12Q
Charlotte, NC 28202
[phone] office
Email correspondence to and from this sender is subject to the N.C. Public Records Law and may be disclosed to third parties.

Kulpa, Sarah
From: Styer, Tami <[e-mail]>
Sent: Thursday, November 10, 2022 1:19 PM
To: Stancil, Vann F; Fred Tarver ([e-mail]); Bryan_Tompkins; Wenonah Haire
Cc: Cranford, David F; Byrum, Wade M; Kulpa, Sarah; Bennett, Jennifer Wright; Lineberger,
Jeff
Subject: Draft Non -Capacity Amendment Application, Rhodhiss Development
Attachments: DRAFT Rhodhiss Debris Gate Non -Cap Amend Application_Nov 2022.docx; Attachment
1 Design Drawings.pdf; Attachment 2 Rev Exhibit A_Rhodhiss Debris Gate_strikethru.pdf;
Attachment 3 Consultation.pdf
Follow Up Flag: Follow up
Flag Status: Flagged
CAUTION: [EXTERNAL] This email originated from outside of the organization. Do not click links or open attachments
unless you recognize the sender and know the content is safe.
Dear Stakeholders:
Duke Energy has attached for your review and comment a draft request for a Non -Capacity Amendment (NCA) of
License for the Catawba-Wateree Hydroelectric Project (Project; FERC No. 2232) for installation of a small inflatable
debris gate at the Rhodhiss Development. Currently, there is an existing debris barrier in place upstream of the
Rhodhiss Powerhouse intake which directs floating debris towards the adjacent ungated spillway. Because this is an
overflow spillway, the organic debris builds up on the spillway before sufficient inflow is present to push it over the
spillway and downstream. To provide passage of upstream debris at the dam, we are proposing to install a 20-ft-
wide debris gate on the spillway adjacent to the intake and powerhouse. The debris gate will consist of single steel
gate, 5.5-ft-high, bottom -hinged, which is raised and lowered by an inflatable bladder.
The addition of the debris gate to the Rhodhiss Development will provide Duke Energy with a safer and more
effective means of managing debris that presently accumulates on the spillway and in front of the powerhouse
intake trashracks. Existing methods of passing debris is to wait for the lake level to exceed the full pond elevation
(more than 1 ft overtopping) during natural high inflow events or to schedule a spill event. When inflows are low like
they are now, debris must be pulled from the water manually from a boat upstream of the spillway. This is high -risk
work that can be avoided with the installation of the debris gate.
Duke Energy anticipates construction for installation of the new debris gate to commence in the third quarter of 2023
and to be complete in the third quarter of 2024.
This non -capacity amendment of license is necessary to align the description of project works and approved license
exhibits to reflect a modification to licensed project works. Installation and operation of the debris gate will not
change licensed Project operations or result in other modifications of license conditions or project works, and no
changes will be made to the FERC Project boundary for the Rhodhiss Development. A bulkhead will be installed to
dewater the spillway section for gate installation, so no drawdown of the lake is presently proposed for construction.
Construction activities will not result in any new land disturbance.
FERC's regulations under 18 CFR § 4.38(a)(7) require Duke Energy to consult with resource agencies and Indian
tribes, to the extent the proposed amendment would affect their interests. Duke Energy has completed consultation
with the North Carolina State Historic Preservation Office pursuant to the Project's Historic Properties Management
Plan and this consultation is provided in the draft NCA under Attachment 3. We are not expecting the planned
inflatable spillway gate installation to trigger or necessitate issuance of a revised 401 Water Quality Certification on
i

behalf of the North Carolina Department of Water Resources (NCDWR), and with this letter is seeking NCDWR's
concurrence.
Attached to this email for your review and comment are the following documents:
1. Draft Non -Capacity Amendment (NCA) of License Application
2. Attachment 1 — Design drawings for the inflatable gate
3. Attachment 2 — Strikethrough Exhibit A - To reduce the size of the document, we are providing only the
revised Exhibit A strikethrough document for the Rhodhiss Development since it's the only development
affected by this NCA application.
4. Attachment 3 — Consultation completed to date (with the NCSHPO)
Comments or questions regarding the proposed Project modification and the Draft Non -Capacity Amendment
Application are due within 60 days of this transmittal (no later than January 10, 2023). We will address any
comments received in a final Non -Capacity License Amendment Application to the FERC.
If you have any questions about this request, please contact me at [e-mail] or (704) 641-
3832. Thank you for your attention to this request.
Best regards,
Tami
1/44ft, DUKE
ENERGY,
Tami Styer, Senior Project Manager
Regulated and Renewable Energy
Duke Energy
526 S. Church Street/EC12Q
Charlotte, NC 28202
[phone] office
2

.1L,',
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Office 803-328-2427
Attention: Jennifer Bennett
Duke Energy Corporation
526 South Church Street
Charlotte, NC 28202
Re. THPO # TCNS #
2023-5-2
Dear Ms. Bennett,
December 14, 2022
Project Description
Non -Capacity Amendment of License for the Catawba-Wateree Hydroelectric Project for
installation of a small inflatable debris gate at the Rhodhiss Development
The Catawba have no immediate concerns with regard to traditional cultural properties,
sacred sites or Native American archaeological sites within the boundaries of the
proposed project areas. However, the Catawba are to be notified if Native American
artifacts and / or human remains are located during the ground disturbance phase
of this project.
If you have questions please contact Caitlin Rogers at 803-328-2427 ext. 226, or e-mail
[e-mail].
Sincerely,
t._,Art_
Wenonah G. Haire
Tribal Historic Preservation Officer

North Carolina Department of Natural and Cultural Resources
State Historic Preservation Office
Ramona M. Bartos, Administrator
Governor Roy Cooper Office of Archives and History
Secretary D. Reid Wilson Deputy Secretary, Darin J. Waters, Ph.D.
August 9, 2022
Jennifer Bennett
Duke Energy
526 South Church Street
Charlotte, NC 28202
[e-mail]
Re: Install Rhodhiss Hydroelectric development spillway debris gate, FERC No. 2232,
Burke and Catawba Counties, ER 22-1846
Dear Ms. Bennett:
Thank you for your email of July 22, 2022, regarding the above -referenced undertaking. We have reviewed
the submittal and offer the following comments.
The proposed project will have no adverse effect on the National Register -eligible Rhodhiss Dam &
Powerplant (CW0352).
The above comments are made pursuant to Section 106 of the National Historic Preservation Act and the
Advisory Council on Historic Preservation's Regulations for Compliance with Section 106 codified at 36
CFR Part 800.
Thank you for your cooperation and consideration. If you have questions concerning the above comment,
contact Renee Gledhill -Earley, environmental review coordinator, at 919-814-6579
or [e-mail]. In all future communication concerning this project, please cite the
above referenced tracking number.
Sincerely,
kci Ramona Bartos, Deputy
(-) State Historic Preservation Officer
Location: 109 East Jones Street, Raleigh NC 27601 Mailing Address: 4617 Mail Service Center, Raleigh NC 27699-4617 Telephone/Fax: [phone]-6898

Salazar, Maggie
Subject:
Attachments:
FW: Duke Energy FERC Proj. No. 2232 - Rhodhiss Development Spillway Debris Gate
Project
Rhodhiss_DebrisGate_SHPO_Filing_20220722.pdf
From: Bennett, Jennifer Wright <[e-mail]>
Sent: Friday, July 22, 2022 6:09 PM
To: DCR - Environmental_Review <[e-mail]>
Cc: Cranford, David F <[e-mail]>; Byrum, Wade M <[e-mail]>; Styer,
Tami <[e-mail]>; Churchill, Christy <[e-mail]>; Salazar, Maggie
<[e-mail]>; Kulpa, Sarah <[e-mail]>; Stiller, Brad <[e-mail]>
Subject: Duke Energy FERC Proj. No. 2232 - Rhodhiss Development Spillway Debris Gate Project
CAUTION: [EXTERNAL] This email originated from outside of the organization. Do not click links or open attachments
unless you recognize the sender and know the content is safe.
Good Afternoon
Please find attached a request for Environmental Review of the proposed Rhodhiss Development
Spillway Debris Gate by Duke Energy in accordance with the Catawba-Wateree Hydroelectric Project No.
2232. This consultation is being requested per License Article 410 of the Catawba-Wateree License.
Please review the attached proposal and contact Jennifer Bennett with any questions at 980.373.7240 of
[e-mail].
Thank you,
Jennifer Bennett I Duke Energy
Project Manager II
Water Strategy & Hydro Licensing
526 South Church Street I Mail Code EC12Q I Charlotte, NC 28202
office: 980.373.7240 I [e-mail]
1

(> DUKE
�, ENERGY
July 22, 2022
Ms. Renee Gledhill -Earley
North Carolina Department of Natural and Cultural Resources
State Historic Preservation Office
4617 Mail Service Center
Raleigh, NC 27699-4617
WATER STRATEGY, HYDRO
LICENSING AND LAKE SERVICES
Duke Energy Corporation
526 South Church Street /EC12Y
Charlotte, NC 28202
Subject: Duke Energy Carolinas, LLC
FERC No. 2232-RH-01 Rhodhiss Development - Spillway Debris Gate Project
NHPA Section 106 Consultation
Dear Ms. Gledhill -Earley:
Duke Energy Carolinas, LLC (Duke Energy) is the Federal Energy Regulatory Commission (FERC)
Licensee of the Catawba-Wateree Hydroelectric Project (FERC Project No. 2232), which includes 11
reservoirs and 13 hydropower stations along the Catawba-Wateree River system and extends
through fourteen counties in North and South Carolina. The Rhodhiss Hydroelectric Development
(Development) is located on the Catawba River in Burke and Caldwell counties, and south of the
town of Granite Falls, North Carolina (Figures 1 and 2). The Rhodhiss Dam impounds the Catawba
River to create Lake Rhodhiss.
The Rhodhiss Dam and Powerplant are eligible for inclusion in the National Register of Historic
Places (NRHP) based upon Criteria A and C as outlined in 36 CFR Part 60.4 because it is deemed
to "be associated with events that have made a significant contribution to the broad patterns of our
history" and to "embody the distinctive characteristics of a type, period, or method of construction, or
represents the work of a master, possesses high artistic value, or represents a significant and
distinguishable entity whose components may lack individual distinction", respectively. The original
use of the Development was for hydroelectric power generation. In addition to power generation, its
present uses include municipal water supply to the cities of Morganton, Lenoir, Granite Falls,
Hudson, and Valdese, North Carolina and recreation.
In accordance with Article 410 of the FERC License for the Catawba-Wateree Hydroelectric Project,
Duke Energy is required to consult with the North Carolina Department of Natural and Cultural
Resources, State Historic Preservation Office (NCSHPO) when undertaking changes to project
historic structures that are not categorically excluded. Duke Energy requests the review of and
comments on potential impacts to historic properties that may result from construction activities
associated with the Rhodhiss Hydro Station - Spillway Debris Gates Project (Project).

Rhodhiss Hydro Station - Spillway Debris Gates Project
July 22, 2022
Page 2
Project Description
The Project consists of installing an Obermeyer pneumatic gate (25 feet [ft] in length including the
abutment) (Figure 3) on the Rhodhiss Dam spillway crest (Photographs 1 through 6) to provide
passage of upstream debris at the dam. Currently, the Rhodhiss Dam spillway is an ungated
concrete Ogee -type overflow spillway constructed of cyclopean concrete and there is no means of
managing debris except for infrequent activation of the overflow spillway. The spillway is
approximately 800 ft long and has a crest elevation of 995.1 ft above mean sea level (MSL). The
maximum height of the spillway crest is approximately 70 ft above the downstream channel bottom.
The Study Area identified for the Project is 3.6 acres and is comprised of the Rhodhiss Dam Spillway
and Powerplant.
Historic and Archaeological Properties
According to the National Park Service NRHP GIS Public Dataset and the NCSHPO HPOWEB GIS
Web Service for known cultural resources, historic structures, or historic districts, there is one
historic architectural resource (Site Number CW0352) within the Study Area. The site is a
component of the c. 1925 Rhodhiss Development (Rhodhiss Dam & Powerplant) and has been
determined as eligible for listing in the NRHP (Figure 4). A summary of the desktop review listing the
cultural resources located within a half -mile radius of the Study Area is provided below in Table 1.
Table 1. Previously Identified Cultural Resources within a Half Mile of the Study Area
BK0243 Rhodhiss Mill Village
SA
Burke
BK0242 Rhodhiss Mill
SO
Burke
CW0355 Rhodhiss Mill Store (gone)
SD
Caldwell
CW0354 Rhodhill Mill Village
SA
Caldwell
CW0351 Rhodhiss Cotton Mill/Burlington SD Caldwell
Industries (gone)
CW0348 John Pinkney House SO Caldwell
CW0352 Rhodhiss Dam & Powerplant DOE Caldwell
1DOE = Individual resource that has been determined eligible under Section 106 of the NHPA.
SA = Surveyed area. Center point of several resources that have been surveyed.
SD = Individual resource which has only been surveyed but has been destroyed or moved.
SO = Individual resource which has only been surveyed. It may be within a National Register, Study List, or DOE district.
License Article 410 requires Duke Energy to implement the September 2012 Programmatic
Agreement Historic Properties Management Plan (HPMP). As described in the HPMP, the

Rhodhiss Hydro Station - Spillway Debris Gates Project
July 22, 2022
Page 3
Development contributing structures/features include the powerhouse, dam, and spillway
(Brockington 2006)1.
The proposed work will adhere to the guidance of 36 CFR Part 67, Guidelines for Rehabilitating
Historic Buildings by retaining the form, detail, and materials that are original to the dam and
headwork structures. Given the simplicity of the structures, specific items were not called out as
"Character Defining" and the structures as a whole contribute to the historic character of the
Rhodhiss Development. The needs of the FERC Project requirements cannot be met without making
alterations to the structures, however, as depicted in the visual renderings, it can be noted that the
modifications are sensitive to the structures and visually minimal in nature.
It is expected that the Project will not require a Section 404 Clean Water Act Permit from the U.S.
Army Corps of Engineers (USACE) Asheville Regulatory Field Office. Therefore, coordination with
the USACE regarding compliance with Section 106 of the National Historic Preservation Act (NHPA)
is not anticipated.
We respectfully request that you review the Project and the attached information to determine if
there may be any potential impacts to historic properties and verify that no additional cultural
resources surveys are required for the proposed Project under Section 106 of the NHPA. If you have
any questions or require additional information after your review of the enclosed materials, please
contact me at (980.373.7240) or [e-mail]
Respectfully,
Jennifer Bennett
Project Manager
Attachments: Figure 1. Project Location
Figure 2. USGS Topographic Quadrangles
Figure 3. Rhodhiss Debris Gate Drawings
Figure 4. Cultural Resources
Site Photographs
cc: David Cranford — Duke Energy [e-mail]
Christy Churchill — Duke Energy [e-mail]
Tami Styer— Duke Energy [e-mail]
Brad Stiller— HDR [e-mail]
Sarah Kulpa — HDR [e-mail]
1 Brockington and Associates, Inc. (Brockington). 2006. Historic Properties Management Plans for the Catawba-Wateree
Hydroelectric Project (FERC #2232) North and South Carolina prepared for Duke Power LLC, doing business as Duke Energy
Carolinas, LLC. (May 2006) page 83.

DATA SOURCE: Bing Hybrid Aerial Imagery
0 Miles 0.5
Burke Caldwell
County County
Study
Area
SUE RHODHISS HYDRO STATION -SPILLWAY DEBRIS GATES PROJECT
F)C .. ENERGY
PATH: \\CLT-SRV02\GIS\PROJECTS\DUKE_ENERGY\MISCUVELASQUEZ\RHODHISS\01_RHODHISS_LOCATION.MXD - USER: GMARCHICA - DATE: 7/11/2022
PROJECT LOCATION
FIGURE 1
SECTION 106 PROJECT REVIEW

F�2
GRANITE FALLSr,- ,.:. \ ,�= ~ '
-QUA�DR [ANGLE•j ','f ,RnoOwn
dh,ss
dr, DUKE
ENERGY.
Study Area
Topographic Quadrangle
DATA SOURCE: Granite Falls 24K Topographic
Map (1993); USA Topo Map Service (2019)
I I
0 Feet 2,000
RHODHISS HYDRO STATION - SPILLWAY DEBRIS GATES PROJECT
USGS TOPOGRAPHIC QUADRANGLES
FIGURE 2
PATH: \\CLT-SRVOZ\GIS\PROJECTS\DUKE_ENERGY\MISCIIVELASQUEZ\RHODHISS\02_RHODHISS_USGSQUAD.MXD - USER: GMARCHICA - DATE: 7/11/2022
SECTION 106 PROJECT REVIEW

20'
DEBRIS GATE
1 I I I I I I I I I I I I
800'
CREST OF SPILLWAY
EL 995.10
1'-6" WIDE ABUTMENT
ELEVATION LOOKING UPSTREAM
SCALE: HORIZ. 1 "=100'-0"
VERT. 1 "=40'-0"
0 0 0 0 0
0 0 0
SPILLWAY
0 20'
DEBRIS GATE
❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑
PT ANCHORS, TYP
SPILLWAY PLAN
SCALE: 1 "=100'-0"
❑ ❑
SEE SPILLWAY
PARTIAL PLAN
ON FIGURE B
c 7c
POWERHOUSE
0 0 0
PRELIMINARY
NOT FOR
CONSTRUCTION
OR
RECORDING
HDR Engineering, Inc. of the Carolinas
4'-0" WIDE
ABUTMENT
POWERHOUSE
nnn
�1r
%//
//
DESIGN ELEVATIONS
TOG CLOSED = 995.10' MAX
TOG OPEN = 989.60' MAX
NOTES:
1. ELEVATIONS BASED ON NGVD29 DATUM.
2. MOUNTING SURFACE TO BE PROVIDED
BY VENDOR.
DUKE ENERGY CAROLINAS, LLC
RHODHISS DEBRIS GATE
PNEUMATIC SPILLWAY CREST GATE
ELEVATION AND PLAN
DATE
06/16/2022
FIGURE
FIGURE A

20'-0"
DEBRIS GATE
4
ODD
TOP OF ABUTMENT
EL 996.10
NORMAL WS EL
AND TOP OF GATE
EL 995.10 /
NEW CREST
EL 989.60
EL 956.60 /
NEW CONCRETE
POWERHOUSE
1
N
SPILLWAY PARTIAL PLAN
SCALE:1 /8"=1 '-0"
SPILLWAY
FLOW CREST
•
N
SECTON
NAPPE BREAKER
GATE
CLOSED POSITION
GATE
OPEN POSITION
SCALE: NOT TO SCALE
PRELIMINARY
NOT FOR
CONSTRUCTION
OR
RECORDING
PT ANCHOR
ima
mimmem
HDR Engineering, Inc. of the Carolinas
DUKE ENERGY CAROLINAS, LLC
RHODHISS DEBRIS GATE
PNEUMATIC SPILLWAY CREST GATE
PARTIAL PLAN AND SECTION
DATE
06/16/2022
FIGURE
FIGURE B

1
1
1
1
1
•
1
1
1
1
•
•
I
•
•
•
art 4"R1:71.1
r ' `
Site No. CW0348
Site No. CW0352
Rhodhiss Dam & Powerplant
RIognr:i Palk
LEGEND
Study Area
Historic Strucures
A Determined Eligible - DOE
Surveyed Only
• Surveyed, Gone
Surveyed Area center
point
Historic Areas
_ Half -Mile Buffer
LDATA SOURCE: NC State Historic Preservation Office
- NCHPOWEB GIS database; Esri World
Topographic Basemap
•
Rhodhiss
Site No. BK0243
0
Feet
1,000
Site No. CW0354
Site No. CW0355
Site No. CW0351
1
1
1
Site No. BK0242
if . DUKE RHODHISS HYDRO STATION -SPILLWAY DEBRIS GATES PROJECT
F) .. ENERGY.. CULTURAL RESOURCES
FIGURE 4
PATH: 11CLT-SRV021GIS1PROJECTSIDUKE_ENERGYIMISCUVELASQUEZ\RHODHISS\04_RHODHISS_CULTURAL.MXD - USER: GMARCHICA - DATE: 7/11/2022
SECTION 106 PROJECT REVIEW

Rhodhiss Hydro Station - Spillway Debris Gates Project
Site Photographs
Photograph 1 — Rhodhiss Dam looking west.
Photograph 2 — Rhodhiss Dam looking west.

Rhodhiss Hydro Station - Spillway Debris Gates Project
Site Photographs
Photograph 3 — Rhodhiss Spillway and Powerhouse looking west .
Photograph 4 — Overview of Rhodhiss Development circa 1970.

Rhodhiss Hydro Station - Spillway Debris Gates Project
Site Photographs
Photograph 5 Debris on the spillway.
Photograph 6 — Proposed location of Obermeyer Gate, looking south.

(> DUKE
�, ENERGY
July 22, 2022
Ms. Renee Gledhill -Earley
North Carolina Department of Natural and Cultural Resources
State Historic Preservation Office
4617 Mail Service Center
Raleigh, NC 27699-4617
WATER STRATEGY, HYDRO
LICENSING AND LAKE SERVICES
Duke Energy Corporation
526 South Church Street /EC12Y
Charlotte, NC 28202
Subject: Duke Energy Carolinas, LLC
FERC No. 2232-RH-01 Rhodhiss Development - Spillway Debris Gate Project
NHPA Section 106 Consultation
Dear Ms. Gledhill -Earley:
Duke Energy Carolinas, LLC (Duke Energy) is the Federal Energy Regulatory Commission (FERC)
Licensee of the Catawba-Wateree Hydroelectric Project (FERC Project No. 2232), which includes 11
reservoirs and 13 hydropower stations along the Catawba-Wateree River system and extends
through fourteen counties in North and South Carolina. The Rhodhiss Hydroelectric Development
(Development) is located on the Catawba River in Burke and Caldwell counties, and south of the
town of Granite Falls, North Carolina (Figures 1 and 2). The Rhodhiss Dam impounds the Catawba
River to create Lake Rhodhiss.
The Rhodhiss Dam and Powerplant are eligible for inclusion in the National Register of Historic
Places (NRHP) based upon Criteria A and C as outlined in 36 CFR Part 60.4 because it is deemed
to "be associated with events that have made a significant contribution to the broad patterns of our
history" and to "embody the distinctive characteristics of a type, period, or method of construction, or
represents the work of a master, possesses high artistic value, or represents a significant and
distinguishable entity whose components may lack individual distinction", respectively. The original
use of the Development was for hydroelectric power generation. In addition to power generation, its
present uses include municipal water supply to the cities of Morganton, Lenoir, Granite Falls,
Hudson, and Valdese, North Carolina and recreation.
In accordance with Article 410 of the FERC License for the Catawba-Wateree Hydroelectric Project,
Duke Energy is required to consult with the North Carolina Department of Natural and Cultural
Resources, State Historic Preservation Office (NCSHPO) when undertaking changes to project
historic structures that are not categorically excluded. Duke Energy requests the review of and
comments on potential impacts to historic properties that may result from construction activities
associated with the Rhodhiss Hydro Station - Spillway Debris Gates Project (Project).

Rhodhiss Hydro Station - Spillway Debris Gates Project
July 22, 2022
Page 2
Project Description
The Project consists of installing an Obermeyer pneumatic gate (25 feet [ft] in length including the
abutment) (Figure 3) on the Rhodhiss Dam spillway crest (Photographs 1 through 6) to provide
passage of upstream debris at the dam. Currently, the Rhodhiss Dam spillway is an ungated
concrete Ogee -type overflow spillway constructed of cyclopean concrete and there is no means of
managing debris except for infrequent activation of the overflow spillway. The spillway is
approximately 800 ft long and has a crest elevation of 995.1 ft above mean sea level (MSL). The
maximum height of the spillway crest is approximately 70 ft above the downstream channel bottom.
The Study Area identified for the Project is 3.6 acres and is comprised of the Rhodhiss Dam Spillway
and Powerplant.
Historic and Archaeological Properties
According to the National Park Service NRHP GIS Public Dataset and the NCSHPO HPOWEB GIS
Web Service for known cultural resources, historic structures, or historic districts, there is one
historic architectural resource (Site Number CW0352) within the Study Area. The site is a
component of the c. 1925 Rhodhiss Development (Rhodhiss Dam & Powerplant) and has been
determined as eligible for listing in the NRHP (Figure 4). A summary of the desktop review listing the
cultural resources located within a half -mile radius of the Study Area is provided below in Table 1.
Table 1. Previously Identified Cultural Resources within a Half Mile of the Study Area
BK0243 Rhodhiss Mill Village
SA
Burke
BK0242 Rhodhiss Mill
SO
Burke
CW0355 Rhodhiss Mill Store (gone)
SD
Caldwell
CW0354 Rhodhill Mill Village
SA
Caldwell
CW0351 Rhodhiss Cotton Mill/Burlington SD Caldwell
Industries (gone)
CW0348 John Pinkney House SO Caldwell
CW0352 Rhodhiss Dam & Powerplant DOE Caldwell
1DOE = Individual resource that has been determined eligible under Section 106 of the NHPA.
SA = Surveyed area. Center point of several resources that have been surveyed.
SD = Individual resource which has only been surveyed but has been destroyed or moved.
SO = Individual resource which has only been surveyed. It may be within a National Register, Study List, or DOE district.
License Article 410 requires Duke Energy to implement the September 2012 Programmatic
Agreement Historic Properties Management Plan (HPMP). As described in the HPMP, the

Rhodhiss Hydro Station - Spillway Debris Gates Project
July 22, 2022
Page 3
Development contributing structures/features include the powerhouse, dam, and spillway
(Brockington 2006)1.
The proposed work will adhere to the guidance of 36 CFR Part 67, Guidelines for Rehabilitating
Historic Buildings by retaining the form, detail, and materials that are original to the dam and
headwork structures. Given the simplicity of the structures, specific items were not called out as
"Character Defining" and the structures as a whole contribute to the historic character of the
Rhodhiss Development. The needs of the FERC Project requirements cannot be met without making
alterations to the structures, however, as depicted in the visual renderings, it can be noted that the
modifications are sensitive to the structures and visually minimal in nature.
It is expected that the Project will not require a Section 404 Clean Water Act Permit from the U.S.
Army Corps of Engineers (USACE) Asheville Regulatory Field Office. Therefore, coordination with
the USACE regarding compliance with Section 106 of the National Historic Preservation Act (NHPA)
is not anticipated.
We respectfully request that you review the Project and the attached information to determine if
there may be any potential impacts to historic properties and verify that no additional cultural
resources surveys are required for the proposed Project under Section 106 of the NHPA. If you have
any questions or require additional information after your review of the enclosed materials, please
contact me at (980.373.7240) or [e-mail]
Respectfully,
‘5"20,
Jennifer Bennett
Project Manager
Attachments: Figure 1. Project Location
Figure 2. USGS Topographic Quadrangles
Figure 3. Rhodhiss Debris Gate Drawings
Figure 4. Cultural Resources
Site Photographs
cc: David Cranford — Duke Energy [e-mail]
Christy Churchill — Duke Energy [e-mail]
Tami Styer— Duke Energy [e-mail]
Brad Stiller— HDR [e-mail]
Sarah Kulpa — HDR [e-mail]
1 Brockington and Associates, Inc. (Brockington). 2006. Historic Properties Management Plans for the Catawba-Wateree
Hydroelectric Project (FERC #2232) North and South Carolina prepared for Duke Power LLC, doing business as Duke Energy
Carolinas, LLC. (May 2006) page 83.

RI:ARWOOD.
EAST BURKE FARMS•
LEGEND
Study Area
DATA SOURCE: Bing Hybrid Aerial Imagery
0 Miles 0.5
Burke
County
Study
Area
COUNTRY PLACE
Caldwell
County
N
�� DUKE RHODHISS HYDRO STATION -SPILLWAY DEBRIS GATES PROJECT
NI.. ENERGY.
PATH: \\CLT-SRV02\GIS\PROJECTS\DUKE_ENERGY\MISCUVELASQUEZIRHODHISS\01_RHODHISS_LOCATION.MXD - USER: GMARCHICA - DATE: 7/11/2022
PROJECT LOCATION
FIGURE 1
SECTION 106 PROJECT REVIEW

—.7.
. .• ..•
RHODHI
S'90
tot
GRANITEFALLS
QUADRANGLE
I `7,; .36.70111—"--emfriti3 ‘Ik
LEGEND
Study Area
Topographic Quadrangle
DATA SOURCE: Granite Falls 24K Topographic
Map (1993); USA Topo Map Service (2019)
0 Feet 2,000
RHODHISS HYDku STATION - SPILLWAY DEBRIS GATES PROJECT
F)/ USGS TOPOGRAPHIC QUADRANGLES
FIGURE 2
PATH: CLT-SRV02\GIS PROJECTS DUKE_ENERGY MISCUVELASQUEZ1RHODHISS 02_RHODHISS_USGSQUAD.MXD - USER: GMARCHICA - DATE: 7/11/2022
SECTION 106 PROJECT REVIEW

20'
DEBRIS GATE
1 I I I I I I I I I I I I
800'
CREST OF SPILLWAY
EL 995.10
1'-6" WIDE ABUTMENT
ELEVATION LOOKING UPSTREAM
SCALE: HORIZ. 1 "=100'-0"
VERT. 1 "=40'-0"
0 0 0 0 0
0 0 0
SPILLWAY
0 20'
DEBRIS GATE
❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑ ❑
PT ANCHORS, TYP
SPILLWAY PLAN
SCALE: 1 "=100'-0"
❑ ❑
SEE SPILLWAY
PARTIAL PLAN
ON FIGURE B
c 7c
POWERHOUSE
0 0 0
PRELIMINARY
NOT FOR
CONSTRUCTION
OR
RECORDING
HDR Engineering, Inc. of the Carolinas
4'-0" WIDE
ABUTMENT
POWERHOUSE
nnn
�1r
%//
//
DESIGN ELEVATIONS
TOG CLOSED = 995.10' MAX
TOG OPEN = 989.60' MAX
NOTES:
1. ELEVATIONS BASED ON NGVD29 DATUM.
2. MOUNTING SURFACE TO BE PROVIDED
BY VENDOR.
DUKE ENERGY CAROLINAS, LLC
RHODHISS DEBRIS GATE
PNEUMATIC SPILLWAY CREST GATE
ELEVATION AND PLAN
DATE
06/16/2022
FIGURE
FIGURE A

20'-0"
DEBRIS GATE
4
ODD
TOP OF ABUTMENT
EL 996.10
NORMAL WS EL
AND TOP OF GATE
EL 995.10 /
NEW CREST
EL 989.60
EL 956.60 /
NEW CONCRETE
POWERHOUSE
1
N
SPILLWAY PARTIAL PLAN
SCALE:1 /8"=1 '-0"
SPILLWAY
FLOW CREST
•
N
SECTON
NAPPE BREAKER
GATE
CLOSED POSITION
GATE
OPEN POSITION
SCALE: NOT TO SCALE
PRELIMINARY
NOT FOR
CONSTRUCTION
OR
RECORDING
PT ANCHOR
ima
mimmem
HDR Engineering, Inc. of the Carolinas
DUKE ENERGY CAROLINAS, LLC
RHODHISS DEBRIS GATE
PNEUMATIC SPILLWAY CREST GATE
PARTIAL PLAN AND SECTION
DATE
06/16/2022
FIGURE
FIGURE B

LEGEND
Study Area
Historic Strucures
A Determined Eligible - DOE
Surveyed Only
• Surveyed, Gone
Surveyed Area center
point
Historic Areas
_ Half -Mile Buffer
LDATA SOURCE: NC State Historic Preservation Office
- NCHPOWEB GIS database; Esri World
Topographic Basemap
•
•
Site No. CW0348
Site No. CW0352
Rhodhiss Dam & Powerplant
1
1
•
♦
•
Rhodhiss
RhAhrsk Park
'rt Gatrc:R' _
I I
0 Feet 1,000
Site No. CW0354
Site No. CW0355
5n,,ps t•`
Site No. CW0351
Site No. BK0243
y , d
DUKE RHODHISS HYDRO STATION -SPILLWAY DEBRIS GATES PROJECT
F) .. ENERGY. CULTURAL RESOURCES
FIGURE 4
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SECTION 106 PROJECT REVIEW

Rhodhiss Hydro Station - Spillway Debris Gates Project
Site Photographs
Photograph 1 — Rhodhiss Dam looking west.
Photograph 2 — Rhodhiss Dam looking west.

Rhodhiss Hydro Station - Spillway Debris Gates Project
Site Photographs
Photograph 3 — Rhodhiss Spillway and Powerhouse looking west .
IrgraPlifr
Photograph 4 — Overview of Rhodhiss Development circa 1970.

Rhodhiss Hydro Station - Spillway Debris Gates Project
Site Photographs
Photograph 5 — Debris on the spillway.
Photograph 6 — Proposed location of Obermeyer Gate, looking south.