20201341 Ver 2_Royal Street No-Rise Flood Study Report (11-10-23)_Signed_20240306

NO -RISE FLOOD STUDY
FOR
ROYAL STREET STREAMBANK STABILIZATION
ROCKY BRANCH, WAKE COUNTY
CITY OF RALEIGH, NORTH CAROLINA
NOVEMBER 10, 2023
PREPARED FOR:
City of Raleigh
Stormwater Department
Raleigh, NC
Phone: [phone]
wayne.miles raleighnc.gov
PREPARED BY:
Timmons Group
NC License No. C-1652
5410 Trinity Road, Suite 102
Raleigh, North Carolina 27607
919.532.3269; 919.859.5663 fax
[e-mail]
Calculations By: Alston Willard, El
Checked By: David Duncan, PE & Chris Rogers, PE
TIMMONS GROUP
YOUR VISION ACHIEVED THROUGH OURS.

Table of Contents
1 Introduction.................................................................................................................................2
2 Analysis......................................................................................................................................2
2.1 Effective Model..................................................................................................................2
2.2 Corrected Effective Model.................................................................................................2
2.3 Existing Conditions Model................................................................................................3
2.4 Proposed Condition Model...............................................................................................7
3 Results Summary........................................................................................................................9
4 Computer Models........................................................................................................................9
5 References...............................................................................................................................10
Tables
Table A — Effective and Corrected Effective 100-year and Floodway Water Surface Elevation
(WSEL) Comparison..........................................................................................................................3
Table B — Existing Conditions Encroachment Stations.......................................................................6
Table C — Corrected Effective and Existing Conditions 100-year and Floodway Water Surface
Elevation (WSEL) Comparison...........................................................................................................7
Table D — Proposed Conditions Encroachment Stations....................................................................8
Table E— Existing and Proposed Conditions 100-year and Floodway Water Surface Elevation
(WSEL) Comparison..........................................................................................................................8
Appendices
Appendix A — Maps
Flood Study Work Map
Appendix B — Published FIS Data and FIRM
Annotated Flood Insurance Study Report (Revised November 10, 2023)
Annotated FIRM (Revised November 10, 2023)
Appendix C —Model Cross section
Effective Model 100-year and FW
Corrected Effective Model 100-year and FW
Existing Conditions Model 100-year and FW
Proposed Conditions Model 100-year and FW
Appendix D — Model Output Tables
Effective Model 100-year and FW
Corrected Effective Model 100-year and FW
Existing Conditions Model 100-year and FW
Proposed Conditions Model 100-year and FW.
Appendix E — Selected Construction and Survey Plans
Appendix F — Email Confirmation
1 Royal Street Stream Bank Stabilization
...*GooseRock Branch No -Rise Flood Stud
6 Y Y
TIMMONS GROUP Wake County, NC

NO -RISE FLOOD STUDY
ROCKY BRANCH
CITY OF RALEIGH, NORTH CAROLINA
1 Introduction
The Rocky Branch (Basin 30, Stream 5), a tributary to Walnut Creek (Basin 30, Stream 1), is located
in the City of Raleigh, Wake County, North Carolina. The project site is in a single-family residential
area located just south of Hillsborough Street and West of Gorman Street in Raleigh, North Carolina.
The project includes the properties located at, 607 and 611 Royal Street. Rocky Branch located on
the properties is unstable and actively eroding. The stream channel has active lateral migration that is
moving towards existing structures located on the properties. Approximately 170 feet of stream bed
and bank have been identified for repair and improvement through the City of Raleigh Drainage
Assistance Program. The watershed above the project site is comprised of both residential and
commercial land use.
The purpose of this study is to evaluate the proposed stream improvements, water surface elevation
changes, for on the effective FEMA base flood and floodway elevations of Rocky Branch and verify
that there will not be a rise in the water surface elevations. HEC-RAS version 6.4.1 was used for this
analysis.
2 Analysis
2.1 Effective Model
The Effective Model for Rocky Branch includes a single plan file named Multiple Profiles (p01), a flow
file named Multiple Profiles (f01), and a geometry file named Existing Conditions (g01). The geometry
file was renamed "Duplicate Effective" and nothing else was changed about that geometry file. The
flow file contains the 100-year base flood, floodway, and 2-year, 10-year, 25-year, 50-year, 100-year,
and 500-year future flow profiles. This study evaluates the project using the 100-year base flow and
floodway profiles. The project impacts are located along the stream between FEMA cross -sections at
river stations 21927 and 21026. Surcharges exceeding the standard tolerance of 0.00 to 1.00 ft were
noted at cross sections 17929, 17838. 16252, 16169, 16157, 15344, 14520, and 14100. These cross
sections are outside the project area and not corrected in the Corrected Effective.
The project site is located on FIRM Panel 3720079400K, dated July 19, 2022. The published data and
Effective FIRM Panels for the site are included in Appendix B and a flood study work map is included
in Appendix A.
The flood study models used in this study were obtained from the North Carolina Floodplain Mapping
Program (NCFMP) Flood Risk Information System' (FRIS) on 5/16/2023 as a HEC-RAS file named
Rocky Branch. Associated shapefiles for cross sections, floodway, effective centerline, and 100-year
floodplain were downloaded and imported into AutoCAD Civil 3D 2023 for base map comparisons and
to analyze limits of disturbance for the project.
2.2 Corrected Effective Model
The corrected effective plan file was copied from the "Multiple Profiles" plan (p01) and renamed
"Corrected Effective" (p02). The "Duplicate Effective" geometry file (g01) was also copied and renamed
"Corrected Effective" (g02). The following changes were made to the Corrected Effective:
• Stream Centerline:
c The stream centerline georeferencing was updated based on surveyed conditions.
2 Royal Street Stream Bank Stabilization
• Rocky Branch No -Rise Flood Stud
TIMMONS GROUP Wake County, NC

c Adjusted the FEMA centerline to the surveyed existing conditions centerline. The
stream length adjusted by lengthening approximately 14.8 feet to its current conditions.
■ FEMA length = 6069.90 ft
■ Adjusted Existing Conditions length = 6084.7 ft
Adjusted FEMA cross section 21746 to 21756:
c Adjusted georeferenced information so that cross section crossed stream at a more
perpendicular alignment.
c Stream station adjusted to 21756.
c Adjusted downstream lengths of cross section 21746 to a consistent 123-feet on Left
Overbank (LOB), Right Overbank (ROB), and Channel. The effective lengths are below:
■ LOB = 102.9 ft
■ Channel = 101.5 ft
■ ROB = 100.49 ft
c Mannings "n" value adjusted:
■ 0.04 changed from station 342.91 to 343.11.
■ 0.08 changed from station 371.56 to 371.47.
c Additional surcharges were noted.
■ Encroachments were moved from a right encroachment of 308 to 315 and a left
encroachment of 385 to 380.
■ The additional surcharges were eliminated with these changes.
The comparison between the effective and the corrected effective 100-year natural and floodway water
surface elevations is shown in Table A.
Table A - Effective and Corrected Effective 100-year and Floodway Water Surface Elevation
EL) Comparison
21927
1 418.54
1 418.54 1
418.54
418.54
1 0.00
1 0.00
21746/21756
415.14
415.16
415.19
415.18
0.05
0.02
21644
412.43
412.43
412.43
412.43
0.00
0.00
21026
404.57
404.58
404.57
404.58
0.00
0.00
2.3 Existing Conditions Model
The Corrected Effective model was copied and renamed Existing Conditions (p03) and the geometry
file was copied and renamed Existing Conditions (g03). The following modifications were made to the
geometry file:
Cross sections were added in order to model the stream in its current condition. The geometry
was based on survey and LiDAR topographic data downloaded from the NCFMP website.
Cross sections were set at the start and end of riffles from the proposed design in various
locations along the project area to ensure the most accurate comparison. Four cross sections
were also cut from the existing conditions surface to model a pedestrian footbridge found on
site. The added cross sections are as follows:
c Cross section 21927 (a FEMA cross section) was modified by adjusting the
downstream lengths of the LOB, ROB, and Channel to account for the additions of the
bridge cross sections.
■ ROB input as 3.59 ft
■ LOB input as 299.68 ft
■ Channel input as 110.05 ft
3 Royal Street Stream Bank Stabilization
...*GooseRock Branch No -Rise Flood Stud
6 Y Y
TIMMONS GROUP Wake County, NC

o Cross section 21817 was added as Cross Section #4 for the existing pedestrian bridge.
■ Obstructions were put at station 592.3 and 614.3 at an elevation of 426-feet
which is consistent with the effective obstruction in that area. The obstruction in
that area is the 603 Royal Street residence.
■ Floodway encroachments were input to minimize surcharges and included in
Table B below.
■ Channel callouts were measured using Civil 3D and morphological "Top of
Bank" determinations.
■ Contraction and Expansion coefficients were input as 0.3 and 0.5 respectively
to account for footbridge routine.
■ Downstream lengths were adjusted to account for the appropriate next cross
section.
o Cross section 21789 was added as Cross Section #3 for the existing pedestrian bridge.
■ Obstructions were put at station 554.9 and 609.9 at an elevation of 426-feet
which is consistent with the effective obstruction in that area. The obstruction in
that area is the 603 Royal Street residence.
■ Floodway encroachments were input to minimize surcharges and included in
Table B below.
■ Channel callouts were measured using Civil 3D and morphological "Top of
Bank" determinations.
■ Contraction and Expansion coefficients were input as 0.3 and 0.5 respectively
to account for footbridge routine.
■ Downstream lengths were adjusted to account for the appropriate next cross
section.
o Pedestrian (PED) Bridge 21786
■ Top chord based off survey points 415.5-feet and 414.7-feet. Low chord one -
foot below high chord.
o Cross section 21783 was added as Cross Section #2 for the existing pedestrian bridge.
■ Obstructions were put at station 557.7 and 611.9 at an elevation of 426-feet
which is consistent with the effective obstruction in that area. The obstruction in
that area is the 603 Royal Street residence.
■ Floodway encroachments were input to minimize surcharges and included in
Table B below.
■ Channel callouts were measured using Civil 3D and morphological "Top of
Bank" determinations.
■ Contraction and Expansion coefficients were input as 0.3 and 0.5 respectively
to account for footbridge routine.
■ Downstream lengths were adjusted to account for the appropriate next cross
section.
o Cross section 21774 was added as Cross Section #1 for the existing pedestrian bridge.
■ Obstructions were put at station 571.1 and 604.7 at an elevation of 426-feet
which is consistent with the effective obstruction in that area. The obstruction in
that area is the 603 Royal Street residence.
■ Floodway encroachments were input to minimize surcharges and included in
Table B below.
■ Channel callouts were measured using Civil 3D and morphological "Top of
Bank" determinations.
■ Contraction and Expansion coefficients were input as 0.1 and 0.3 respectively
to account for footbridge routine.
■ Downstream lengths were adjusted to account for the appropriate next cross
section.
4 Royal Street Stream Bank Stabilization
...*GooseRock Branch No -Rise Flood Stud
6 Y Y
TIMMONS GROUP Wake County, NC

o Cross section 21756
■ Obstructions were put at stations 462.6 and 497.7 at an elevation of 422-feet,
and station 398.95 and 405.57 at an elevation of 416.4-feet which is consistent
with the effective obstructions in that area. The obstructions in that area are the
607 and 611 Royal Street residences.
■ Geometry was modified from corrected effective using updated survey
information.
■ Floodway encroachments were input to minimize surcharges and included in
Table B below.
■ Channel callouts were measured using Civil 3D and morphological "Top of
Bank" determinations.
■ Contraction and Expansion coefficients were input as 0.1 and 0.3 respectively
to account for footbridge routine.
■ Downstream lengths were adjusted to account for the appropriate next cross
section.
■ Mannings "n" remained the same as in the Corrected Effective model.
o Cross section 21735 was added to model the existing pedestrian bridge.
■ Obstructions were put at stations 395.27 and 408.99 at an elevation of 425-feet,
and station 460.72 and 501.3 at an elevation of 425-feet which is consistent with
the effective obstructions in that area. The obstructions in that area are the 607
and 611 Royal Street residences.
■ Geometry was based on existing survey and LiDAR.
■ Floodway encroachments were input to minimize surcharges and included in
Table B below.
■ Channel callouts were measured using Civil 3D and morphological "Top of
Bank" determinations.
■ Contraction and Expansion coefficients were input as 0.1 and 0.3 respectively
to account for footbridge routine.
■ Downstream lengths were adjusted to account for the appropriate next cross
section.
■ Mannings "n" values were assigned to be consistent with the effective model.
Overbank left was input as 0.1, overbank right was input as 0.08, and the
channel was input as 0.04.
o Cross section 21686 was added to model the existing pedestrian bridge.
■ Obstructions were put at stations 388.35 and 409.42 at an elevation of 425-feet,
which is consistent with the effective obstructions in that area. The obstruction
in that area is the 611 Royal Street residence.
■ Geometry was based on existing survey and LiDAR.
■ Floodway encroachments were input to minimize surcharges and included in
Table B below.
■ Channel callouts were measured using Civil 3D and morphological "Top of
Bank" determinations.
■ Contraction and Expansion coefficients were input as 0.1 and 0.3 respectively
to account for footbridge routine.
■ Downstream lengths were adjusted to account for the appropriate next cross
section.
■ Mannings "n" values were assigned to be consistent with the effective model.
Overbank left was input as 0.1, overbank right was input as 0.08, and the
channel was input as 0.04.
o Cross section 21662 was added to model the existing pedestrian bridge.
■ Geometry was based on existing survey and LiDAR.
5 Royal Street Stream Bank Stabilization
• Rocky Branch No -Rise Flood Stud
Wake Count NC
TIMMONS GROUP y°

■ Floodway encroachments were input to minimize surcharges and included in
Table B below.
■ Channel callouts were measured using Civil 3D and morphological "Top of
Bank" determinations.
■ Contraction and Expansion coefficients were input as 0.1 and 0.3 respectively
to account for footbridge routine.
■ Downstream lengths were adjusted to account for the appropriate next cross
section.
■ Mannings "n" values were assigned to be consistent with the effective model.
Overbank left was input as 0.1, overbank right was input as 0.08, and the
channel was input as 0.04.
o Cross section 21632 is an original FEMA cross section.
■ Geometry was updated with survey and LiDAR topographical data.
■ Floodway encroachments were input to minimize surcharges and included in
Table B below.
■ Channel callouts were measured using Civil 3D and morphological "Top of
Bank" determinations.
■ Contraction and Expansion coefficients were input as 0.1 and 0.3 respectively
to account for footbridge routine.
■ Downstream lengths were adjusted to account for the appropriate next cross
section.
■ Mannings "n" remained the same as in the Corrected Effective model. Overbank
left was input as 0.1, overbank right was input as 0.08, and the channel was
input as 0.04.
o Cross section 21587 was added to model the existing pedestrian bridge.
■ Geometry was based on existing survey and LiDAR.
■ Floodway encroachments were input to minimize surcharges and included in
Table B below.
■ Channel callouts were measured using Civil 3D and morphological "Top of
Bank" determinations.
■ Contraction and Expansion coefficients were input as 0.1 and 0.3 respectively
to account for footbridge routine.
■ Downstream lengths were adjusted to account for the appropriate next cross
section.
■ Mannings "n" remained the same as in the Corrected Effective model. Overbank
left was input as 0.1, overbank right was input as 0.08, and the channel was
input as 0.04.
o The model output results show surcharges of -0.03, -0.01, -0.01, -0.04, -0.01, -0.01 ft
at cross sections 21587, 21662, 21686, 21735, and 21786.1 BR D outside the normally
acceptable range of 0.00 ft to 1.00 ft. Efforts to remove these surcharges were limited
by the nature of the incised stream. According to the NCFMP Riverine Modeling
Guidelines and Standard (revised 5/22/2020), the accepted range in these
circumstances is -0.09 ft to 1.04 ft.
Table B — Existina Conditions Encroachment Stations
21817
448
567
119
21789
455
554.8
99.8
21783
455
557.65
102.65
6 Royal Street Stream Bank Stabilization
• Rocky Branch No -Rise Flood Stud
TIMMONS GROUP Wake County, NC

Station
21774
Existing
ConditionsStream
445
Right
570
.
Floodway
125
21746/21756
290
388
98
21735
326
379
53
21686
312.5
340
27.5
21662
299.75
325.9
26.15
21644/21632
303
331
28
21587
313.3
337
23.7
21026
270
390
120
The model was run using HEC-RAS 6.4.1" and the water surface elevations compared to the Corrected
Effective water surface elevations for the base flood and floodway (FW) as shown in Table C.
Table C - Corrected Effective and Existing Conditions 100-year and Floodway Water Surface
Elevation (WSEL) Comparison
Corrected Effective .0(p03) Difference
River Sta W.S. Elev W.S. Elev W.S. Elev
100year ti -
21927 418.54 418.54 418.54 418.54 0.00 0.00
218167
417.07
417.06
21789
416.58
416.58
Pedestrian
Bridge 21786
21783
416.78
416.77
21774
416.35
416.37
21746/21756
415.19
415.18
415.38
415.39
0.19
0.21
21735
414.67
414.63
21686
412.4
412.39
21662
412.29
412.28
21644/21632
412.43
412.43
411.21
411.23
-1.22
-1.20
21587
408.97
408.95
21026
404.57
404.58
404.57
404.58
0.00
0.00
The existing conditions model reflects the addition of a total of nine (9) cross sections. Due to the
addition of these cross sections, base flood elevations increased and decreased throughout the project
area but matched the Corrected Effective water surface elevation at the extents of the project site.
2.4 Proposed Condition Model
The Existing Conditions plan file (p03) was copied and renamed "Proposed Conditions" (p04) and the
"Existing Conditions" geometry file (g03) was copied and renamed "Proposed Conditions" (g04). The
following modifications were made to the geometry file:
• Adjusted the Proposed Conditions centerline to the Proposed alignment. The stream length
adjusted by shortening approximately 10.3 feet to its proposed conditions.
o Existing Conditions length = 6084.7-feet
o Adjusted Proposed Conditions length = 6074.4-feet
• Cross sections updated using proposed grading topography and imported into HEC-RAS.
7 Royal Street Stream Bank Stabilization
• Rocky Branch No -Rise Flood Stud
TIMMONS GROUP Wake County, NC

c Geometry data was adjusted on all nine (9) added cross sections and two (2) modified
FEMA cross sections.
The floodway encroachment stations were adjusted throughout the project area to account for the
significant changes to the stream channel and the effects of the improvements on the water surface
elevation. The updated encroachment stations are shown in Table D.
Table D - Proposed Conditions
ConditionsStream Station Existing
21817 448
Encroachment Stations
.
Right ...
567 119
21789
455
554.8
99.8
21783
455
557.65
102.65
21774
445
570
125
21746/21756
337.85
365.2
27.35
21735
349
372.85
23.85
21686
312
338.75
26.75
21662
304.75
329.75
25
21644/21632
306
333.5
27.5
21587
313.3
335
21.7
21026
270
390
120
The Proposed Conditions model was run, and the water surface elevations compared to the Existing
Conditions model as shown in Table E. Existing and Proposed cross -sections are included in Appendix
C. Appendix D includes the Existing and Proposed model output tables. Construction plans showing
the proposed improvements are included in Appendix E.
Table E- Existing and Proposed Conditions 100-year and Floodway Water Surface Elevation
WSEL Gom arison
21927 418.54
418.54 418.54
418.54 0
0
21817
417.07
416.69 417.06
416.69 -0.38
-0.37
21789
416.58
416.58 416.58
416.58 0
0
Pedestrian Bridge 21786
21783
416.78
416.78
416.77
416.77
0
0
21774
416.35
416.35
416.37
416.37
0
0
21746/21756
415.38
414.32
415.39
414.36
-1.06
-1.03
21735
414.67
412.8
414.63
412.81
-1.87
-1.82
21686
412.4
411.71
412.39
411.72
-0.69
-0.67
21662
412.29
410.48
412.28
410.48
-1.81
-1.8
21644/21632
411.21
409.43
411.23
409.43
-1.78
-1.8
21587
408.97
408.97
408.95
408.95
0
0
21026
404.57
404.57
404.58
404.58
0
0
The results of the analysis show that no rise in water surface elevation occurs in the FEMA floodplain
of floodway within the project area. A drop in water surface elevation occurs throughout, with a
maximum of -1.87 at cross section 21735. The floodway model also did not show a rise and had a
8 Royal Street Stream Bank Stabilization
• Rocky Branch No -Rise Flood Stud
TIMMONS GROUP Wake County, NC

maximum drop of -1.82 at cross section 21735. The change in water surface elevation exceeds 0.50
foot and will require a LOMR certification upon completion of construction. Email correspondence
regarding the flood study requirements is included in Appendix F.
3 Results Summary
The results of the analysis show that no rise in water surface elevation occurs in the regulated
floodplain or floodway of Rocky Branch (Basin 30, Stream 5) due to the proposed channel and bank
improvements. Due to the drop in water surface of over -0.10 ft, a Letter of Map Revision (LOMR) will
be required once the improvements are completed and the as -built survey is completed and verified.
4 Computer Models
The following computer models have been included on with the electronic submittal:
Rocky Branch Model
Effective Model
Project:
Rocky Branch
RockyBranch.prj
Plan:
Multiple Profiles
RockyBranch.p01
Geometry:
Existing Conditions
RockyBranch.g01
Steady Flow:
Multiple Profiles
RockyBranch.f01
Corrected Effective Model
Project:
Rocky Branch
RockyBranch.prj
Plan:
Corrected Effective
RockyBranch.p02
Geometry:
Corrected Effective
RockyBranch.g02
Steady Flow:
Multiple Profiles
RockyBranch.f01
Existing Conditions Model
Project:
Rocky Branch
RockyBranch.prj
Plan:
Existing Conditions — survey
RockyBranch.p03
Geometry:
Existing Conditions — survey
RockyBranch.g03
Steady Flow:
Multiple Profiles
RockyBranch.f01
Proposed Conditions Model
Project:
Rocky Branch
RockyBranch.prj
Plan:
Proposed Conditions
RockyBranch.p04
Geometry:
Proposed Conditions
RockyBranch.g04
Steady Flow:
Multiple Profile
RockyBranch.f01
9 Royal Street Stream Bank Stabilization
• Rock Branch No -Rise Flood Stud
.• ,� �. Y Y
TIMMONS GROUP Wake County, NC

5 References
NC Floodplain Mapping Program I https://flood.nc.gov/ncflood/
11 RAS 6.4.1 HEC. (n.d.). Retrieved September 30, 2022, from https://www.hec.usace.army.mil/software/hgc-
ras/download.aspx
Stabilization
TIMMONS GROUP
10 Royal Street Stream Bank
Rocky Branch No -Rise Flood Study
Wake County, NC

ENGINEERING "NO RISE" CERTIFICATION
This is to certify that I am a duly qualified engineer licensed to practice in the State of
North Carolina. It is to further certify that the attached technical data supports the fact
that the improvements planned for the Royal Street Streambank Stabilization Project in
the in City of Raleigh, Wake County, North Carolina on Rocky Branch, will not cause a
rise in the effective base flood model floodplain water surface elevations. This
certification is for improvements that include proposed grading and fill for stream
stabilization in the FEMA and Community Floodway and floodplain as shown on the
attached work maps prepared by Timmons Grou.) dated October 30, 2023
H CA 1R94'°zs, ,
Signature:
�6 -A ;
4111psRogers,
.
050236
ri ,A.y • a
T'
Timmons Group. Firm No C-1652
Company
Stor iiNN:atei- Groin Leader
Title
5410 Trinitv Road. Suite 102
Street Address
12�a1ei17ii. Noi-tli Carolina, 27607
City, State, Zip
919-866-4951
Phone

Appendix A
Flood Study Workmap

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Appendix 6
Annotated Flood Insurance Study Report (Revised November
10t1, 2023)
Annotated FIRM Panel (Revised November 10th12023)

FLOOD INSURANCE STUDY
ID VARTNj�,
JND Sti
FEDERAL EMERGENCY MANAGEMENT AGENCY
A Report of Flood Hazards in
WAKE COUNTY, NORTH
CAROLINA AND
INCORPORATED AREAS
Community Name
Community
Number
CITY OF RALEIGH
370243
TOWN OF APEX
370467
TOWN OF CARY
370238
TOWN OF FUQUAY-VARINA
370239
TOWN OF GARNER
370240
TOWN OF HOLLY SPRINGS
370403
TOWN OF KNIGHTDALE
370241
TOWN OF MORRISVILLE
370242
TOWN OF ROLESVILLE
370468
TOWN OF WAKE FOREST
370244
TOWN OF WENDELL
370245
TOWN OF ZEBULON
370246
WAKE COUNTY
370368
NORTH C—OLnNA
Cooperating Technical S ' +
�',4,�ilr� � �� � W w�V !i
..... �W li II II�I�
REVISED: 7/19/2022
Federal Emergency Management Agency
State of North Carolina
Flood Insurance Study Number
37183CV000E
www.fema.gov and www.ncfloodmaps.com

Table 8 - Flooding Sources Studied by Detailed Methods: Revised or Newly Studied
Source
Riverine Sources
Affected Communties
From
To
Reedy Creek (Basin 20, Stream 11)
At the confluence with Swift Creek (Basin
Approximately 160 feet downstream of
Rdu
20, Stream 1)
Aversboro Road
Town Of Garner
Wake County
Reedy Creek (Basin 6, Stream 8)
At Rodgers Road
Approximately 475 feet upstream of
Rdu
Rodgers Road
Town Of Wake Forest
Wake County
Reedy Creek Tributary (Basin 20, Stream
At Claymore Drive
Approximately 0.2 mile upstream of
Town Of Gamer
9)
Claymore Drive
Richland Creek
At the confluence with Neuse River (Basin
At the Wake/Franklin County boundary
City Of Raleigh
15, Stream 1)
Rdu
Town Of Wake Forest
Wake County
Richland Creek
The confluence with Neuse River (Basin
The Wake/Franklin County boundary
City Of Raleigh
15, Stream 1)
Rdu
Town Of Wake Forest
Wake County
Richland Creek (Basin 18, Stream 3)
At the confluence with Crabtree Creek
At the confluence of Medfield Tributary
City Of Raleigh
(Basin 18, Stream 9)
Richland Creek Tributary
At the confluence with Richland Creek
Approximately 2007 feet upstream of confluence
City Of Raleigh
(Basin 5, Stream 1)
with Richland Creek
Town Of Wake Forest
Richland Creek Tributary
The confluence with Richland Creek
Approximately 200 feet upstream of Retail
City Of Raleigh
(Basin 5, Stream 1)
Drive
Town Of Wake Forest
Rocky Branch (Basin 30, Stream 5)
At the confluence with Walnut Creek
Approximately 200 feet upstream of
City Of Raleigh
(Basin 30, Stream 1)
Hillsborough Street
Rocky Ford Branch (Basin 24, Stream 5)
At the confluence with Kenneth Creek
Approximately 1.0 mile upstream of the
Rdu
(Basin 24, Stream 2)
confluence with Kenneth Creek (Basin 24, Stream
Town Of Fuquay-Varina
2)
Wake County
Sanford Creek (Basin 6, Stream 7)
At the confluence with Smith Creek (Basin
Approximately 300 feet upstream of the
Rdu
6, Stream 1)
confluence of Basin 6, Stream 9
Town Of Wake Forest
Wake County
Smith Creek
At the Wake/Franklin County boundary
At the confluence with Neuse River (Basin
Rdu
15, Stream 1)
Town Of Wake Forest
Wake County
Southeast Prong Beaverdam Creek
At the confluences of Southwest Prong
Approximately 215 feet upstream of Wade
City Of Raleigh
(Basin 18, Stream 30)
Beaverdam Creek (Basin 18, Stream 28)
Avenue
and Beaverdam Creek (Basin 18, Stream
28
Southwest Prong Beaverdam Creek
At the confluences of Southeast Prong
Approximately 375 feet upstream of
City Of Raleigh
(Basin 18, Stream 29)
Beaverdam Creek (Basin 18, Stream 30)
Wade Avenue
and Beaverdam Creek (Basin 18, Stream
28
Spring Branch (Basin 6, Stream 6)
At the confluence with Dunn Creek (Basin
Approximately 875 feet upstream of
Town Of Wake Forest
6, Stream 6)
Franklin Street
Stirrup Iron Creek
At the confluence with Brier Creek (Basin
At the Wake/Durham County boundary
Town Of Cary
18, Stream 14)
Town Of Morrisville
Stirrup Iron Creek
Just upstream of Highway 1-40
The Wake/Durham County boundary
City Of Durham
Rdu
Town Of Cary
Town Of Morrisville
Wake County
Swift Creek
Approximately 0.3 mile upstream of Holly
Approximately 700 feet upstream of US
Rdu
Springs Road
64
Town Of Cary
Wake County
Swift Creek
At Lake Benson Dam
Approximately 1.5 miles upstream of NC-
Rdu
50 (Benson Road)
Town Of Cary Town Of
Garner Wake County
Swift Creek
The confluence with Neuse River
The Johnston/Wake County boundary
Rdu
Wake County
Swift Creek Tributary No. 7A (Basin 20,
At the confluence with Swift Creek
Approx. 0.5 mile upstream of the confluence with
Town Of Cary
Stream 25)
Tributary No. 7 (Basin 20, Stream 24)
Swift Creek Tributary No.
7 (Basin 20, Stream 24)
Sycamore Creek (Basin 18, Stream 6)
At the confluence with Crabtree Creek
Approximately 1.0 mile upstream of
City Of Raleigh
(Basin 18, Stream 9)
Leesville Road
Rdu
Wake County
Terrible Creek (Basin 22, Stream 19)
At the confluence with Middle Creek
Approximately 1.0 mile upstream of
Rdu
(Basin 22, Stream 1)
Sunset Lake Road
Town Of Fuquay-Varina
Wake County
Flood Insurance Study Report: WAKE COUNTY, NORTH CAROLINA AND INCORPORATED AREAS Page 17 of 189
Effective Date: July 19, 2022

Table 13 - Summary of Discharges
Flooding Source
Discharges (cfs)
Location
Drainage Area
(square miles)
10% Annual
Chance
2% Annual
Chance
1% Annual
Chance
1% Annual
Future Annual
Chance
0.2% Annual
Chance
Richland Creek Tributary
Hydrologic node located at 35.9601,-78.5445
0.68
749
1189
1363
1858
Approximately 0.5 mile upstream of confluence with
Richland Creek (Basin 5, Stream 1)
0.45
1370
1370
Approximately 0.5 mile upstream of confluence with
Richland Creek (Basin 5, Stream 1)
0.45
1190
Approximately 0.8 mile upstream of confluence with
Richland Creek (Basin 5, Stream 1)
0.40
1160
1310
Approximately 1.1 miles upstream of confluence with
Richland Creek (Basin
5, Stream 1)
0.20
672
741
Rocky Branch (Basin 22, Stream 8)
Hydrologic node located at 35.6547,-78.7807
1.95
725
1049
1290
1729
1972
Hydrologic node located at 35.6638,-78.7841
1.56
599
1049
1287
1576
1937
Hydrologic node located at 35.6756,-78.7896
0.86
533
934
1125
1303
1617
Hydrologic node located at 35.6812,-78.7893
0.65
518
897
1074
1231
1522
Rocky Branch (Basin 30, Stream 5)
Hydrologic node located at 35.7574,-78.6384
3.15
2017
2883
3206
3971
Hydrologic node located at 35.7584,-78.6396
3.10
2008
2871
3193
3956
Hydrologic node located at 35.763,-78.643
2.90
2156
3111
3617
4319
Hydrologic node located at 35.7657,-78.6429
2.73
2097
3032
3532
4210
Hydrologic node located at 35.7663,-78.6436
2.52
1986
2889
3368
4018
Hydrologic node located at 35.7673,-78.6466
2.47
1977
2876
3352
3999
Hydrologic node located at 35.77,-78.6486
2.11
1808
2793
3209
3992
Hydrologic node located at 35.7733,-78.656
1.94
1742
2685
3084
3836
Hydrologic node located at 35.7749,-78.656
1.77
1601
2431
2780
3435
Hydrologic node located at 35.7773,-78.6626
1.46
1511
2278
2603
3215
Hydrologic node located at 35.7802,-78.6667
1.19
1424
2154
2460
3033
Hydrologic node located at 35.7819,-78.6711
0.93
1257
1910
2180
2681
Hydrologic node located at 35.7832,-78.6743
0.63
824
1265
1446
1759
Hydrologic node located at 35.7852,-78.6789
0.50
740
1125
1281
1556
Hydrologic node located at 35.7895,-78.6852
0.35
514
770
877
1078
Hydrologic node located at 35.7903,-78.6867
0.26
313
467
612
807
Hydrologic node located at 35.7946,-78.6903
0.16
361
562
647
906
Rocky Ford Branch (Basin 24, Stream 5)
Hydrologic node located at 35.5665,-78.8135
1.29
200
360
440
1450
640
Hydrologic node located at 35.5691,-78.8246
0.98
170
300
380
1290
540
Sanford Creek (Basin 6, Stream 7)
Hydrologic node located at 35.9374,-78.516
5.90
1360
2250
2560
3830
3410
Hydrologic node located at 35.9378,-78.5073
5.44
1240
2080
2370
3630
3190
Hydrologic node located at 35.9362,-78.4973
4.92
1140
1930
2210
3410
2980
Hydrologic node located at 35.9354,-78.4944
2.96
990
1730
1980
3080
2710
Hydrologic node located at 35.9335,-78.4907
1 1.36
480
790
930
1410
1280
Smith Creek
Hydrologic node located at 35.9093,-78.5386
23.46
3940
5840
6460
8840
8170
Flood Insurance Study Report: WAKE COUNTY, NORTH CAROLINA AND INCORPORATED AREAS Page 53 of 189
Effective Date: July 19, 2022

Table 16 - Roughness Coefficients
Stream
Channel "n"
Overbank "n"
Lynn Road Tributary (Basin 18, Stream 32)
0.035 to 0.050
0.015 to 0.150
Mahlers Creek (Basin 20, Stream 6)
0.050
0.032 to 0.090
Mango Creek (Basin 15, Stream 11)
0.050 to 0.054
0.032 to 0.090
Marks Creek
0.025 to 0.070
0.032 to 0.130
Marsh Creek (Basin 18, Stream 17)
0.038 to 0.060
0.048 to 0.200
Medfield Tributary (Basin 18, Stream 39)
0.045 to 0.050
0.015 to 0.120
Middle Creek
0.040 to 0.050
0.030 to 0.140
Millbrook Tributary to Marsh Creek (Basin 18, Stream 19)
0.035 to 0.050
0.060 to 0.130
Mills Branch (Basin 22, Stream 5)
0.030 to 0.070
0.032 to 0.130
Mine Creek (Basin 18, Stream 31)
0.035 to 0.050
0.015 to 0.150
Mingo Creek (Basin 12, Stream 2)
0.041 to 0.044
0.100 to 0.200
Moccasin Creek
0.030 to 0.070
0.070 to 0.220
Morris Branch
0.030 to 0.050
0.100 to 0.200
Morrisville Tributary (Basin 18, Stream 26)
0.050
0.032 to 0.090
Mud Branch (Basin 4, Stream 15)
0.032 to 0.050
0.035 to 0.090
Nancy Branch
0.045 to 0.050
0.035 to 0.150
Neil Branch (Basin 24, Stream 8)
0.030 to 0.070
0.035 to 0.130
Neil Creek (Basin 24, Stream 7)
0.030 to 0.070
0.055 to 0.110
Neills Creek
0.035 to 0.048
0.100 to 0.150
Neuse River
0.035 to 0.060
0.055 to 0.250
New Hope Tributary to Marsh Creek (Basin 18, Stream 18)
0.035 to 0.065
0.035 to 0.200
New Light Creek
0.032 to 0.070
0.060 to 0.150
Norris Branch
0.048 to 0.050
0.055 to 0.145
NP
0.050
0.050 to 0.150
Panther Branch (Basin 22, Stream 2)
0.050
0.035 to 0.090
Panther Creek
0.030 to 0.070
0.070 to 0.130
Perry Creek (Basin 10, Stream 19)
0.042
0.130
Perry Creek (Basin 15, Stream 26)
0.032 to 0.125
0.015 to 0.200
Perry Creek East Branch (Basin 15, Stream 27)
0.035 to 0.050
0.015 to 0.120
Pigeon House Branch (Basin 18, Stream 27)
0.045 to 0.048
0.015 to 0.120
Poplar Branch (Basin 13, Stream 2)
0.032 to 0.050
0.032 to 0.090
Poplar Creek (Basin 13, Stream 1)
0.050
0.055 to 0.090
Powell Creek (Basin 8, Stream 7)
0.032 to 0.050
0.015 to 0.120
Reedy Branch (Basin 27, Stream 5)
0.045 to 0.050
0.100 to 0.200
Reedy Branch Tributary (Basin 27, Stream 6)
0.045 to 0.050
0.100 to 0.200
Reedy Creek (Basin 6, Stream 8)
0.050
0.045 to 0.090
Reedy Creek Tributary (Basin 20, Stream 9)
0.050 to 0.059
0.035 to 0.090
Richland Creek
0.035 to 0.070
0.035 to 0.200
Richland Creek (Basin 18, Stream 3)
0.030 to 0.048
0.015 to 0.150
Richland Creek Tributary
0.040 to 0.055
0.070 to 0.200
Richland Creek Tributary 2
0.050
0.070 to 0.130
Rocky Branch (Basin 22, Stream 8)
0.050
0.032 to 0.090
Rocky Branch (Basin 30, Stream 5)
0.030 to 0.071
0.016 to 0.120
Rocky Ford Branch (Basin 24, Stream 5)
0.030 to 0.070
0.050 to 0.110
Sanford Creek (Basin 6, Stream 7)
0.050
0.045 to 0.090
Smith Creek
0.032 to 0.050
0.080 to 0.150
Snipes Creek
0.042 to 0.045
0.120 to 0.130
Southeast Prong Beaverdam Creek (Basin 18, Stream 30)
0.050 to 0.055
0.015 to 0.150
Southwest Prong Beaverdam Creek (Basin 18, Stream 29)
0.045 to 0.055
0.015 to 0.150
Spring Branch (Basin 6, Stream 6)
0.050 to 0.065
0.035 to 0.090
Stirrup Iron Creek
0.015 to 0.150
0.032 to 0.170
Straight Branch (Basin 20, Stream 23)
0.032 to 0.050
0.032 to 0.090
Swift Creek
0.032 to 0.072
0.035 to 0.240
Swift Creek Tributary No. 7 (Basin 20, Stream 24)
0.032 to 0.060
0.035 to 0.090
Swift Creek Tributary No. 7A (Basin 20, Stream 25)
0.032 to 0.050
0.032 to 0.090
Sycamore Creek (Basin 18, Stream 6)
0.030 to 0.070
0.035 to 0.150
Terrible Creek (Basin 22, Stream 19)
0.032 to 0.050
0.032 to 0.090
Thomas Creek
0.050
0.145
Flood Insurance Study Report: WAKE COUNTY, NORTH CAROLINA AND INCORPORATED AREAS Page 68 of 189
Effective Date: July 19, 2022

Table 22 - Floodway Data
Floodway Source
Floodway
Water Surface Elevation
Cross
Section
Distance (Feet
Above Mouth)
Width (Feet)
Section Area
(Square Feet)
Mean Velocity
(Feet Per
Second)
Regulatory
1% Annual
Chance
Future
Water-
Surface
Elevation
Without
Floodway
With
Floodway
Increase
Richland Creek (Basin 18, Stream 3)
253
25,311
71.0
474.0
8.9
373.1
373.1
373.5
0.4
260
26,008
40.0
189.0
2.9
375.3
375.3
376.3
1.0
Richland Creek Tributary
002
188
119.0
523.0
6.7
226.5'
224.5
224.6
0.1
006
610
143.0
472.0
6.7
231.6
231.6
231.8
0.2
010
1,045
81.0
301.0
10.0
235.2
235.2
235.3
0.1
015
1,479
109.0
495.0
7.2
239.4
239.4
239.5
0.1
020
2,026
25.0
131.0
13.8
244.4
244.4
244.4
0.0
025
2,455
40.0
209.0
6.6
251.2
251.7
251.2
251.4
0.2
029
2,872
40.0
215.0
5.5
254.1
254.5
254.1
255.1
1.0
033
3,341
22.0
104.0
11.5
258.8
259.1
258.8
259.4
0.6
038
3,804
30.0
143.0
8.3
265.0
265.4
265.0
266.0
1.0
043
4,285
30.0
163.0
7.1
269.5
269.8
269.5
270.2
0.7
048
4,819
43.0
129.0
9.0
277.0
277.4
277.0
277.0
0.0
052
5,240
20.0
99.0
11.7
282.3
282.7
282.3
282.3
0.0
057
5,689
20.0
120.0
5.6
287.1
287.6
287.1
287.3
0.2
060
6,038
18.0
64.0
10.5
289.3
1 289.5
289.3
289.3
0.0
064
6,430
66.0
791.0
0.8
310.8
310.9
310.8
311.8
1.0
Rocky Branch (Basin 22, Stream 8)
016
1,551
110.0
390.0
6.5
299.9
299.9
300.7
0.8
028
2,809
65.0
299.0
7.8
305.3
305.3
306.3
1.0
042
4,166
100.0
349.0
7.5
312.4
312.4
312.9
0.5
047
4,730
120.0
892.0
2.5
319.6
319.6
320.3
0.7
060
6,010
100.0
467.0
5.6
321.3
321.3
322.1
0.8
072
7,249
60.0
285.0
8.5
330.1
330.1
330.7
0.6
085
8,506
170.0
527.0
6.1
337.4
337.4
337.4
0.0
096
9,624
185.0
443.0
7.7
342.3
342.3
342.4
0.1
105
10,507
110.0
443.0
5.9
345.4
345.4
345.6
0.2
114
11,391
95.0
436.0
5.3
351.3
351.3
351.7
0.4
118
11,825
105.0
263.0
10.8
354.2
354.2
354.6
0.4
125
12,547
100.0
218.0
10.0
356.8
356.8
357.2
0.4
131
13,080
95.0
214.0
10.2
361.3
361.3
361.3
0.0
134
13,389
75.0
256.0
8.0
363.1
363.1
363.4
0.3
137
13,653
75.0
478.0
4.9
369.4
369.4
370.1
0.7
143
14,307
125.0
243.0
10.0
370.5
370.5
371.5
1.0
Rocky Branch (Basin 30, Stream 5)
009
876
94.0
722.0
6.5
236.51
233.3
233.3
0.0
018
1,788
258.0
1687.0
4.1
236.51
234.3
234.7
0.4
029
2,881
216.0
873.0
7.2
236.51
235.6
235.8
0.2
036
3,594
174.0
506.0
11.1
237.9
237.9
237.9
0.0
039
1 3,851
1 140.0
1 508.0
1 8.3
1 241.5
1241.5
1 241.8
1 0.3
045
4,472
220.0
1382.0
4.7
243.7
243.7
244.1
0.4
Flood Insurance Study Report: WAKE COUNTY, NORTH CAROLINA AND INCORPORATED AREAS Page 162 of 189
Effective Date: July 19, 2022

Table 22 - Floodway Data
Floodway Source
Floodway
Water Surface Elevation
Cross
Section
Distance (Feet
Above Mouth)
Width (Feet)
Section Area
(Square Feet)
Mean Velocity
(Feet Per
Second)
Regulatory
1% Annual
Chance
Future
Water-
Surface
Elevation
Without
Floodway
With
Floodway
Increase
Rocky Branch (Basin 30, Stream 5)
050
5,008
179.0
618.0
6.4
246.8
246.8
246.8
0.0
053
5,346
171.0
1167.0
5.5
251.3
251.3
251.3
0.0
059
5,869
144.0
1116.0
4.9
251.7
251.7
251.8
0.1
064
6,377
58.0
479.0
7.5
255.0
255.0
255.0
0.0
074
7,407
65.0
378.0
11.4
260.3
260.3
1 261.0
0.7
081
8,052
72.0
712.0
4.7
269.7
269.7
270.0
0.3
090
8,986
80.0
494.0
9.0
273.0
273.0
273.7
0.7
096
9,612
105.0
794.0
5.3
286.2
286.2
286.7
0.5
100
9,962
99.0
978.0
3.0
289.5
289.5
290.0
0.5
110
11,033
29.0
300.0
9.3
291.7
291.7
1 291.7
0.0
120
12,018
47.0
390.0
6.7
298.5
298.5
298.6
0.1
123
12,326
103.0
772.0
5.4
306.9
306.9
307.4
0.5
126
12,623
80.0
530.0
5.5
311.9
311.9
312.1
0.2
127
12,678
80.0
675.0
4.3
314.8
314.8
315.7
0.9
136
13,634
256.0
516.0
9.1
317.4
317.4
317.4
0.0
138
13,776
210.0
781.0
6.2
320.8
320.8
320.9
0.1
141
14,053
77.0
490.0
7.8
325.6
325.6
325.6
0.0
145
14,520
149.0
695.0
4.0
326.8
326.8
326.8
0.0
151
15,053
63.0
298.0
14.3
329.3
329.3
329.3
0.0
155
15,461
77.0
300.0
8.3
333.1
333.1
333.1
0.0
161
16,096
53.0
485.0
5.1
351.1
351.1
351.1
0.0
162
16,169
65.0
583.0
5.3
351.3
351.3
351.3
0.0
172
17,157
38.0
198.0
9.8
351.3
351.3
351.5
0.2
174
17,366
72.0
537.0
3.3
361.2
361.2
361.2
0.0
180
18,043
40.0
150.0
10.6
362.7
362.7
362.7
0.0
182
18,223
49.0
254.0
8.1
367.5
367.5
367.5
0.0
188
18,821
34.0
200.0
6.4
369.7
369.7
369.7
0.0
190
18,984
65.0
331.0
4.7
381.0
381.0
381.5
0.5
201
20,101
47.0
137.0
9.8
392.5
392.5
392.6
0.1
202
20,243
61.0
259.0
7.0
395.6
395.6
396.4
0.8
209
20,859
52.0
259.0
6.2
403.6
403.6
403.6
0.0
217
-21-F46 21,756
77.0
108.0
7.7
415.1
415. 4 414.4
415.2 414.4
0.1
220
22,015
70.0
265.0
3.8
421.2
421.2
421.5
0.3
223
22,285
31.0
116.0
5.3
424.5
424.5
424.7
0.2
224
22,422
23.0
103.0
6.0
425.7
425.7
426.1
0.4
226
22,608
42.0
151.0
4.0
429.7
429.7
430.3
0.6
229
22,944
1 70.0
1 435.0
1 2.8
1 442.5
1442.5
1 443.3
0.8
233
23,338
113.0
758.0
0.7
442.6
442.6
443.4
0.8
Rocky Ford
Branch (Basin
24, Stream 5)
000
35
30.0
98.0
6.7
305.41
302.0
302.7
0.7
008
779
55.0
115.0
7.9
308.9
308.9
309.0
0.1
Flood Insurance Study Report: WAKE COUNTY, NORTH CAROLINA AND INCORPORATED AREAS Page 163 of 189
Effective Date: July 19, 2022

Appendix C
Effective Mode1100-year and FW
Corrected Effective Mode1100-year and FW
Existing Conditions Mode1100-year and FW
Proposed Conditions Model 100-year and FW

Effective Model 100-year and FW

Rocky Branch Plan: Multiple Profiles 10/3/2023
Geom: Existing Conditions Flow: Multiple Profiles
IRS = 21927
.08� �.08�0�.06�
430
0
4 1
Legend
6
------------ &------------
EG FLWY
428
-----------------------
EG 100yr EX
Crit 100yr EX
426
WS 100yr EX
WS FLWY
42411
Crit FLWY
t
Ground
422
I eff
w
Bank Sta
420
--------------------------------------4-------------------------------------
Encroachment
418
416
414
0 100 200 300 400 500
Station (ft)
Rocky Branch Plan: Multiple Profiles 10/3/2023
Geom: Existing Conditions Flow: Multiple Profiles
IRS = 21746
.1 3J<04)1� .08
435
Legend
--------------------------
EG 100yr EX
------------ &------------
EG FLWY
430
WS FLWY
.............................................
Crit FLWY
WS 100yr EX
425
Crit 100yr EX
t
Ground
o
�
m
Bank Sta
w
Encroachment
420
415
------------------------- +-------------
410
0 100 200 300 400 500
Station (ft)
0

Rocky Branch Plan: Multiple Profiles 10/3/2023
Geom: Existing Conditions Flow: Multiple Profiles
IRS = 21644
.1 J<.04)1� .08
430
Legend
EG 100yr EX
------------ &-----------
EG FLWY
425
WS FLWY
.............................................
Crit FLWY
WS 100yr EX
420
Crit 100yr EX
t
Ground
o
�
m
Bank Sta
w
Encroachment
415
--------------4-----
410
405
0 100 200 300 400
500
Station (ft)
Rocky Branch Plan: Multiple Profiles 10/3/2023
Geom: Existing Conditions Flow: Multiple Profiles
IRS = 21026
.1 08 P
425
0 1
4
Legend
--------------------------
EG 100yr EX
420
------------ &------------
EG FLWY
WS FLWY
.............................................
Crit FLWY
415
WS 100yr EX
Crit 100yr EX
t
Ground
410
Ba n*k Sta
w
Encroachment
405
-------------------------------�
400
395
0 100 200 300 400 500 600
700
Station (ft)
2

Corrected Effective Model 100-year and FW

Rocky Branch Plan: Corrected Effective 10/3/2023
Geom: Corrected Effective Flow: Multiple Profiles
IRS = 21927
.08� �.08�0�.06�
430
0
4 1
Legend
6
------------ &------------
EG FLWY
428
-----------------------
EG 100yr EX
Crit 100yr EX
426
WS 100yr EX
WS FLWY
42411
Crit FLWY
t
Ground
422
I eff
w
Bank Sta
420
--------------------------------------4-------------------------------------
Encroachment
418
416
414
0 100 200 300 400
500
Station (ft)
Rocky Branch Plan: Corrected Effective 10/3/2023
Geom: Corrected Effective Flow: Multiple Profiles
IRS = 21756
.1 >I<04�� .08
440
Legend
--------------------------
EG 100yr EX
435
------------ &-----------
EG FLWY
WS 100yr EX
430
WS FLWY
.............................................
Crit FLWY
Crit 100yr EX
425
Ground
o
�
m
Bank Sta
w
420
Encroachment
415
---------------- +-------------
410
405
0 100 200 300 400 500
600
Station (ft)
0

Rocky Branch Plan: Corrected Effective 10/3/2023
Geom: Corrected Effective Flow: Multiple Profiles
IRS = 21644
.1 J<.04)1� .08
430
Legend
EG 100yr EX
------------ &-----------
EG FLWY
425
WS FLWY
.............................................
Crit FLWY
WS 100yr EX
420
Crit 100yr EX
t
Ground
o
�
m
Bank Sta
w
Encroachment
415
--------------4-----
410
405
0 100 200 300 400
500
Station (ft)
Rocky Branch Plan: Corrected Effective 10/3/2023
Geom: Corrected Effective Flow: Multiple Profiles
IRS = 21026
.1 08 P
425
0 1
4
Legend
--------------------------
EG 100yr EX
420
------------ &------------
EG FLWY
WS FLWY
.............................................
Crit FLWY
415
WS 100yr EX
Crit 100yr EX
t
Ground
410
Ba n*k Sta
w
Encroachment
405
-------------------------------�
400
395
0 100 200 300 400 500 600
700
Station (ft)
2

Existing Conditions Model 100-year and FW

Rocky Branch
Plan: Existing Conditions 11/10/2023
.08
.08 .06
430
0
4
0
1
Legend
------------- A
6
FLWY
428
- -------- .------------
EG 100yr FU
---------------------------
EG 100yr EX
426
WS 100yr FU
-
---- -------- .------------
Crit 100yr FU
424
---- -------- +------------
Crit 100yr EX
WS 100yr EX
o
Crit FLWY
422
WS FLWY
>
a�
w
•
Ground
420
Ineff
Bank Sta
418
Encroachment
416
414
0 100
200 300 400
500
Station (ft)
Rocky Branch
Plan: Existing Conditions 11/10/2023
Cross Section #4 - PED bridge
.1 .04 .08
435
Legend
------------- T------------
EG 100yr FU
yr FU
160---------------------------
430
EG 100yr EX
-
------------- -------------
EG FLWY
WS 100yr EX
WS FLWY
425
•
Ground
o
Bank Sta
>
t
Encroachment
a�
w
420
--------------------------- -------------------------------
415
410
100 200 300
400 500 600
700
Station (ft)

Rocky Branch
Plan: Existing Conditions 11/10/2023
Cross section #3 - PED bridge
.1 >1.08
435
0
4
Legend
------------- r------------
EG 100yr FU
---------------------------
EG 100yr EX
------------- A
EG FLWY
WS 100yr EX
WS FLWY
WS 100yr FU
425
------------- r------------
Crit 100yr FU
o
---------------------------
Crit 100yr EX
------------- A
Crit FLWY
a�
w
420
•
Ground
Bank Sta
__ __________________
Encroachment
415
410
100 200 300
400 500 600
700
Station (ft)
Rocky Branch
Plan: Existing Conditions 11/10/2023
PED bridge
1 >108
435
0
4
Legend
------------- r------------
EG 100yr FU
---------------------------
EG 100yr EX
------------- A
EG FLWY
WS 100yr EX
WS FLWY
-
---- -------- r------------
Crit 100yr FU
425
�
WS 100yr FU
o
Crit 100yr EX
------------- A
Crit FLWY
a�
w
420
•
Ground
Bank Sta
Encroachment
415
410
100 200 300
400 500 600
700
Station (ft)
2

Rocky Branch
Plan: Existing Conditions 11/10/2023
Cross section #2 - PED bridge
s�
.1 .08
435
0
4
Legend
-------------f------------
EG 100yr FU
---------------------------
EG 100yr EX
------------- A
EG FLWY
WS 100yr FU
WS 100yr EX
WS FLWY
425
•
Ground
o
Bank Sta
>
Encroachment
a�
w
420
----------------
415
410
100 200 300
400 500 600
700
Station (ft)
Rocky Branch
Plan: Existing Conditions 11/10/2023
Cross section #1 - PED bridge
1 08
435
0�
4
Legend
------------- T------------
EG 100yr FU
---------------------------
EG 100yr EX
------------- A
EG FLWY
160yr FU
------------- T------------
Crit 100yr FU
-
------------- -------------
Crit FLWY
425
'
WS FLWY
o
WS 100yr EX
------------- +------------
Crit 100yr EX
w
420
•
Ground
Bank Sta
------------------________________________
Encroachment
415
410
100 200 300
400 500 600
700
Station (ft)
3

Rocky Branch Plan: Existing Conditions 11/10/2023
1 J-r 04 .08
440
Legend
-------------f------------
EG 100yr FU
435
---------------------------
EG 100yr EX
A
-------------
FLWY
WS 100yr FU
430
-
------------- .------------
Crit 100yr FU
------------- A
FLWY
425
WS FLWY
o
WS 100yr EX
------------- +------------
Crit 100yr EX
w
420
Ground
•
Bank Sta
415
Encroachment
410
405
0 100 200 300 400 500
600
Station (ft)
Rocky Branch Plan: Existing Conditions 11/10/2023
.1 .04�� .08
440
Legend
------------- T------------
EG 100yr FU
------------- A
EG FLWY
---------------------------
EG 100yr EX
160yr FU
430
-
------------- T------------
Crit 100yr FU
WS 100yr EX
425
------------- +------------
Crit 100yr EX
o
Crit FLWY
>
WS FLWY
a�
w
420
Ground
•
Bank Sta
415
Encroachment
410
405
0 100 200 300 400 500
600
Station (ft)
4

Rocky Branch Plan: Existing Conditions 11/10/2023
.1 s-L .04 .08
435
Legend
-------------f------------
EG 100yr FU
---------------------------
EG 100yr EX
430 ------------- -------------
- EG FLWY
WS 100yr FU
WS 100yr EX
425
WS FLWY
■
Ground
o Bank Sta
420
> Encroachment
a�
w
415
410
ii
405
0 100 200 300 400 500 660
Station (ft)
Rocky Branch Plan: Existing Conditions 11/10/2023
1> .04 .08
435- IF
Legend
------------- T------------
EG 100yr FU
---------------------------
EG 100yr EX
430 ------------- -------------
- EG FLWY
160yr FU
WS 100yr EX
425 •
WS FLWY
■
Ground
o Bank Sta
420
> Encroachment
a�
w
415
410
405
0 100 200 300 400 500
Station (ft)
5

Rocky Branch
Plan: Existing Conditions 11/10/2023
1
'ro .08
430
Legend
-------------f------------
EG 100yr FU
---------------------------
EG 100yr EX
425
-------------•-----------
EG FLWY
WS 100yr FU
---- -------- .------------
Crit 100yr FU
-
------------- -------------
Crit FLWY
420
A
WS FLWY
o
WS 100yr EX
------------- +------------
Crit 100yr EX
w
415
•
Ground
Bank Sta
-------------------------
-------------- ------
Encroachment
410
405
0 100
200 300 400
500
Station (ft)
Rocky Branch
Plan: Existing Conditions 11/10/2023
.1
.04�� .08
430
Legend
------------- T------------
EG 100yr FU
---------------------------
EG 100yr EX
425
------------- -------------
-
EG FLWY
160yr FU
WS 100yr EX
420
•
WS FLWY
■
Ground
o
Bank Sta
415
>
Encroachment
a�
w
410
===Z=====
405
400
0 100
200 300 400
500
Station (ft)
0

Rocky Branch Plan: Existing Conditions 11/10/2023
1 'I . ? 08
425 0
Legend
4
-------------f------------
EG 100yr FU
---------------------------
EG 100yr EX
420 ------------- -------------
- EG FLWY
WS 100yr FU
---- -------- .------------
Crit 100yr FU
415 ------------- -------------
- Crit FLWY
WS FLWY
o WS 100yr EX
410 ------------- +------------
-
Crit 100yr EX
w •
Ground
#.. 405 Bank Sta
Encroachment
400
395
0 100 200 300 400 500 600 700
Station (ft)

Proposed Conditions 100-year and FW

Rocky Branch
Plan: Proposed Conditions 11/10/2023
.08
.08 .06
430
0
4
0
1
Legend
------------- A
6
FLWY
428
- -------- .------------
EG 100yr FU
---------------------------
EG 100yr EX
426
WS 100yr FU
-
---- -------- .------------
Crit 100yr FU
424
---- -------- +------------
Crit 100yr EX
WS 100yr EX
o
Crit FLWY
422
WS FLWY
>
a�
w
•
Ground
420
Ineff
Bank Sta
418
Encroachment
416
414
0 100
200 300 400
500
Station (ft)
Rocky Branch
Plan: Proposed Conditions 11/10/2023
Cross Section #4 - PED bridge
1 08
435
0
4
Legend
------------- T------------
EG 100yr FU
---------------------------
EG 100yr EX
------------- A
EG FLWY
160yr FU
------------- T------------
Crit 100yr FU
WS 100yr EX
425
'
WS FLWY
o
Crit FLWY
------------- +------------
Crit 100yr EX
w
420
•
Ground
Bank Sta
------------------------------------------------
Encroachment
415
410
100 200 300
400 500 600
700
Station (ft)

Rocky Branch
Plan: Proposed Conditions 11/10/2023
Cross section #3 - PED bridge
.1 >1.08
435
0
4
Legend
------------- r------------
EG 100yr FU
---------------------------
EG 100yr EX
------------- A
EG FLWY
WS 100yr EX
WS FLWY
WS 100yr FU
425
------------- r------------
Crit 100yr FU
o
---------------------------
Crit 100yr EX
------------- A
Crit FLWY
a�
w
420
•
Ground
Bank Sta
__ __________________
Encroachment
415
410
100 200 300
400 500 600
700
Station (ft)
Rocky Branch
Plan: Proposed Conditions 11/10/2023
1 >108
435
0
4
Legend
------------- r------------
EG 100yr FU
---------------------------
EG 100yr EX
------------- A
EG FLWY
WS 100yr EX
WS FLWY
-
---- -------- r------------
Crit 100yr FU
425
�
WS 100yr FU
o
Crit 100yr EX
------------- A
Crit FLWY
a�
w
420
•
Ground
Bank Sta
Encroachment
415
410
100 200 300
400 500 600
700
Station (ft)
2

Rocky Branch
Plan: Proposed Conditions 11/10/2023
Cross section #2 - PED bridge
s�
.1 .08
435
0
4
Legend
-------------f------------
EG 100yr FU
---------------------------
EG 100yr EX
------------- A
EG FLWY
WS 100yr FU
WS 100yr EX
WS FLWY
425
•
Ground
o
Bank Sta
>
Encroachment
a�
w
420
----------------
415
410
100 200 300
400 500 600
700
Station (ft)
Rocky Branch
Plan: Proposed Conditions 11/10/2023
Cross section #1 - PED bridge
1 08
435
0�
4
Legend
------------- T------------
EG 100yr FU
---------------------------
EG 100yr EX
------------- A
EG FLWY
160yr FU
------------- T------------
Crit 100yr FU
-
------------- -------------
Crit FLWY
425
'
WS FLWY
o
WS 100yr EX
------------- +------------
Crit 100yr EX
w
420
•
Ground
Bank Sta
------------------________________________
Encroachment
415
410
100 200 300
400 500 600
700
Station (ft)
3

Rocky Branch Plan: Proposed Conditions 11/10/2023
_I
.1 .08
440
0
4
Legend
-------------f------------
EG 100yr FU
-------------•-----------
EG FLWY
435
EG 100yr EX
WS 100yr FU
-------------.------------
Crit 100yr FU
430
------------- -------------
-
Crit FLWY
WS FLWY
o
WS 100yr EX
425
------------- +------------
-
Crit 100yr EX
w
•
Ground
Bank Sta
420
415
-------------------------- -----------------
------------------------4-----------------
410
0 100 200 300 460 500
660
Station (ft)
Rocky Branch Plan: Proposed Conditions 11/10/2023
1 O+- .08
440
Legend
------------- T------------
EG 100yr FU
435
---------------------------
EG 100yr EX
A
-------------
FLWY
160yr FU
430
-
------------- T------------
Crit 100yr FU
------------- A
FLWY
425
•
WS FLWY
o
WS 100yr EX
------------- +------------
Crit 100yr EX
w
420
Ground
Bank Sta
415
Encroachment
410
405
0 100 200 300 400 500
600
Station (ft)
4

Rocky Branch Plan: Proposed Conditions 11/10/2023
.1 J" .04 .08
435
Legend
-------------f------------
EG 100yr FU
---------------------------
EG 100yr EX
430
------------- -------------
-
EG FLWY
WS 100yr FU
-------------.------------
Crit 100yr FU
425
------------- -------------
-
Crit FLWY
WS FLWY
o
WS 100yr EX
1�
420
------------- +------------
Crit 100yr EX
w
•
Ground
Bank Sta
415
Encroachment
r
410
405
0 100 200 300 400 500
600
Station (ft)
Rocky Branch Plan: Proposed Conditions 11/10/2023
1 �.04�.05�
435
Legend
------------- T------------
EG 100yr FU
-------------•-----------
EG FLWY
430
EG 100yr EX
160yr FU
-------------T------------
Crit 100yr FU
425
------------- -------------
-
Crit FLWY
•
WS FLWY
o
WS 100yr EX
1�
420
------------- +------------
Crit 100yr EX
w
•
Ground
Bank Sta
415
Encroachment
------
----Z ----
410
405
0 100 200 300 400
500
Station (ft)
5

Rocky Branch Plan: Proposed Conditions 11/10/2023
.1 s1' .04 .08
430
Legend
-------------f------------
EG 100yr FU
A
-------------
FLWY
425
---------------------------
EG 100yr EX
WS 100yr FU
---- -------- .------------
Crit 100yr FU
WS 100yr EX
420
------------- +------------
Crit 100yr EX
o
Crit FLWY
>
WS FLWY
a�
w
415
•
Ground
Bank Sta
Encroachment
410
405
0 100 200 300 400
500
Station (ft)
Rocky Branch Plan: Proposed Conditions 11/10/2023
.1 .04�� .08
430
Legend
------------- T------------
EG 100yr FU
---------------------------
EG 100yr EX
425
------------- -------------
-
EG FLWY
160yr FU
WS 100yr EX
420
•
WS FLWY
■
Ground
o
Bank Sta
—
415
>
Encroachment
a�
w
410
===Z=====
405
400
0 100 200 300 400
500
Station (ft)
0

Rocky Branch Plan: Proposed Conditions 11/10/2023
1 'I . ? 08
425 0
Legend
4
-------------f------------
EG 100yr FU
---------------------------
EG 100yr EX
420 ------------- -------------
- EG FLWY
WS 100yr FU
---- -------- .------------
Crit 100yr FU
415 ------------- -------------
- Crit FLWY
WS FLWY
o WS 100yr EX
410 ------------- +------------
-
Crit 100yr EX
w •
Ground
#.. 405 Bank Sta
Encroachment
400
395
0 100 200 300 400 500 600 700
Station (ft)

Appendix D
Effective Mode1100-year and FW
Corrected Effective Mode1100-year and FW
Existing Conditions Mode1100-year and FW
Proposed Conditions Model 100-year and FW

Effective Model 100-year and FW

HEC-RAS Plan: Multiple Pro Locations: User Defined
'®'
�®'
--------------
�®'
�®'
--------------
rzmlw-
�®'
�
®
rr
.r• rr���
r r .•
��
rr�
--------------
�®'
��
rr
rr
•: rr
®'r'
®'r'
®'r
rrr •.
®��
�®'
��®
rr
•: rr
®'r' :®'r'
:®'r
rrr
��
rrr
r r

Corrected Effective Model 100-year and FW

HEC-RAS Plan: CorrEFF Locations: User Defined
'®'
�®'
--------------
�®'
��
rr
rr
'r•'r���
rr r '�®r'
r:r
�®'
��®
rr
'r•'r�
�
rr r
rr.
--------------
rzmlw-
�®'
�
®
rr
.r• rr���
r r .•
��
rr�
--------------
�®'
��
rr
rr
•: rr
®'r'
®'r'
®'r
rrr •.
®��
�®'
��®
rr
•: rr
®'r' :®'r'
:®'r
rrr
��
rrr
r r

Existing Conditions Model 100-year and FW

HEC-RAS Plan: Exist-sury River: RockvBranch Reach: Main
Reach
River Sta
Profile
Q Total
Min Ch El
W.S. Elev
Crit W.S.
E.G. Elev
E.G. Slope
Vel Chnl
Flow Area
Top Width
Froude # Chl
(cfs)
(ft)
(ft)
(ft)
(ft)
(ft/ft)
(ft/s)
(sq ft)
(ft)
Main
23338 Inter
100yr EX
647.00
432.00
442.55
436.69
442.55
0.000004
0.30
2311.09
668.49
0.02
Main
23338 Inter
FLWY
647.00
432.00
443.32
436.64
443.33
0.000019
0.70
752.07
112.08
0.04
Main
23338 Inter
100yr FU
743.00
432.00
442.68
437.25
442.68
0.000005
0.33
2394.20
673.98
0.02
Main
23244. Inter
Culvert
Main
23069 Inter
100yr EX
647.00
432.00
442.54
436.61
442.55
0.000101
1.42
1057.11
477.55
0.09
Main
23069 Inter
FLWY
647.00
432.00
443.29
436.61
443.32
0.000099
1.49
683.70
112.08
0.09
Main
23069 Inter
100yr FU
743.00
432.00
442.65
436.94
442.67
0.000122
1.57
1113.39
481.73
0.10
Main
23025 349
100yr EX
647.00
430.47
442.531
442.55
0.0000941
1.38
1127.01
489.00
0.08
Main
23025 349
FLWY
647.00
430.47
443.29
443.31
0.000105
1.40
625.19
91.79
0.08
Main
23025 349
100yr FU
743.00
430.47
442.65
442.67
0.000113
1.53
1184.20
493.53
0.09
Main
22944 868
100yr EX
647.00
429.18
442.50
436.03
442.53
0.000198
2.02
1088.67
548.19
0.11
Main
22944 868
FLWY
647.00
429.18
443.19
436.03
443.28
0.000350
2.80
430.86
70.00
0.15
Main
22944 868
100yr FU
743.00
429.18
442.61
436.46
442.65
0.000229
2.19
1150.99
552.72
0.12
Main
22904. 869
Culvert
Main
22814 Inter
100yr EX
647.00
427.00
431.59
430.78
432.27
0.007590
6.63
98.34
33.31
0.66
Main
22814 Inter
FLWY
647.00
427.00
431.73
430.78
432.36
0.006970
6.35
101.85
30.74
0.62
Main
22814 Inter
100yr FU
743.00
427.00
431.68
431.04
432.53
0.009071
7.39
101.51
33.70
0.72
Main
22712 Inter
100yr EX
612.00
426.00
430.04
429.91
431.14
0.013590
8.55
90.69
82.37
0.88
Main
22712 Inter
FLWY
612.00
426.00
430.46
431.38
0.011226
7.71
79.34
23.85
0.75
Main
22712 Inter
100yr FU
721.00
426.00
430.43
430.43
431.45
0.011245
8.45
122.99
84.24
0.82
Main
22608 348
100yr EX
612.00
421.54
429.70
427.72
430.02
0.004258
4.62
160.88
101.15
0.47
Main
22608 348
FLWY
612.00
421.54
430.27
427.73
430.52
0.002832
4.04
151.53
41.90
0.37
Main
22608 348
100yr FU
721.00
421.54
429.79
428.77
430.20
0.005282
5.25
170.48
106.38
0.52
Main
22578. 870
Culvert
Main
22536 Inter
100yr EX
612.00
422.00
426.12
425.89
427.20
0.012996
8.39
76.42
32.03
0.87
Main
22536 Inter
FLWY
612.00
422.00
426.63
425.87
427.43
0.008965
7.18
85.24
24.97
0.69
Main
22536 Inter
100yr FU
721.00
422.00
426.45
426.20
427.65
0.012455
8.83
87.34
33.94
0.87
Main
22507 Inter
100yr EX
612.00
422.00
426.08
426.74
0.006268
6.63
105.62
41.39
0.63
Main
22507 Inter
FLWY
612.00
422.00
426.55
427.12
0.005509
6.02
101.66
25.90
0.54
Main
22507 Inter
100yr FU
721.00
422.00
426.44
427.17
0.006144
7.01
120.83
43.62
0.63
Main
22422 Inter
100yr EX
612.00
420.00
425.70
426.27
0.004420
6.21
124.17
50.76
0.54
Main
22422 Inter
FLWY
612.00
420.00
426.12
426.67
0.004811
5.95
102.89
22.47
0.49
Main
22422 Inter
100yr FU
721.00
420.00
426.00
424.77
426.69
0.004851
6.83
141.07
79.06
0.57
Main
22362 Inter
100yr EX
612.00
420.00
424.85
423.96
425.87
0.007981
8.41
106.49
72.14
0.72
Main
22362 Inter
FLWY
612.00
420.00
425.00
426.17
0.012181
8.68
70.49
15.97
0.73
Main
22362 Inter
100yr FU
721.00
420.00
425.23
424.97
426.29
0.007628
8.70
136.83
85.97
0.71
Main
22285 871
100yr EX
612.00
417.40
424.51
422.63
424.98
0.008104
5.48
111.62
33.28
0.52
Main
22285 871
FLWY
612.00
417.40
424.66
422.64
425.09
0.007296
5.27
116.20
31.05
0.48
Main
22285 871
100yr FU
721.00
417.40
424.96
423.03
425.43
0.007044
5.54
136.10
83.55
0.49
Main
22243 872
Culvert
Main
22070 Inter
100yr EX
612.00
416.00
421.30
419.32
421.46
0.001422
3.72
346.54
180.59
0.31
Main
22070 Inter
FLWY
612.00
416.00
421.65
419.34
421.93
0.002104
4.38
164.94
36.80
0.35
Main
22070 Inter
100yr FU
721.00
416.00
421.50
419.56
421.68
0.001585
4.04
383.31
186.25
0.33
Main
22050 347
100yr EX
612.00
413.75
421.21
421.41
0.002124
4.84
319.92
167.19
0.33
Main
22050 347
FLWY
612.00
413.75
421.51
421.86
0.002758
5.69
184.31
47.34
0.38
Main
22050 347
100yr FU
721.00
413.75
421.40
421.63
0.002421
5.27
352.25
173.39
0.36
Main
22015 Inter
100yr EX
612.00
414.00
421.21
419.15
421.31
0.000824
3.03
336.14
164.32
0.23
Main
22015 Inter
FLWY
612.00
414.00
421.54
419.16
421.70
0.001182
3.78
264.56
70.00
0.28
Main
22015 Inter
100yr FU
721.00
414.00
421.41
419.48
421.52
0.000910
3.26
369.58
180.63
0.25
Main
21972. 873
Culvert
Main
21927 Inter
100yr EX
612.00
414.00
418.54
418.54
419.06
0.005452
6.67
215.65
227.95
0.59
Main
21927 Inter
FLWY
612.00
414.00
418.54
418.54
419.25
0.006761
7.43
154.58
130.00
0.66
Main
21927 Inter
100yr FU
721.00
414.00
418.70
418.70
419.23
0.005716
7.01
252.46
238.27
0.61
Main
21817
100yr EX
612.00
411.95
417.07
417.40
0.004205
5.18
210.43
141.73
0.50
Main
21817
FLWY
612.00
411.95
417.06
417.39
0.004151
5.14
203.36
119.00
0.50
Main
21817
100yr FU
721.00
411.95
417.44
417.74
0.003553
5.12
266.04
157.30
0.47

HEC-RAS Plan: Exist-sury River: RockvBranch Reach: Main (Continued)
Reach
River Sta
Profile
Q Total
Min Ch El
W.S. Elev
Crit W.S.
E.G. Elev
E.G. Slope
Vel Chnl
Flow Area
Top Width
Froude # Chl
(cfs)
(ft)
(ft)
(ft)
(ft)
(ft/ft)
(ft/s)
(sq ft)
(ft)
Main
21789
100yr EX
612.00
411.00
416.58
416.23
417.21
0.005953
7.29
169.91
103.78
0.61
Main
21789
FLWY
612.00
411.00
416.58
416.22
417.19
0.005920
7.27
169.43
99.80
0.60
Main
21789
100yr FU
721.00
411.00
416.50
416.48
417.43
0.009116
8.91
161.33
100.42
0.75
Main
21786.1
Bridge
Main
21783
100yr EX
612.00
410.98
416.78
417.18
0.003936
5.90
205.58
116.51
0.49
Main
21783
FLWY
612.00
410.98
416.77
417.16
0.003913
5.87
201.06
102.65
0.49
Main
21783
100yr FU
721.00
410.98
416.93
417.40
0.004595
6.51
223.39
119.29
0.53
Main
21774
100yr EX
612.00
410.96
416.35
416.35
417.04
0.007367
8.29
183.89
127.65
0.66
Main
21774
FLWY
612.00
410.96
416.37
416.37
417.04
0.007109
8.16
186.07
125.00
0.65
Main
21774
100yr FU
721.00
410.96
416.53
416.53
417.27
0.007892
8.80
208.04
130.29
0.69
Main
21756 Inter
100yr EX
612.00
409.90
415.38
415.38
416.18
0.011341
7.80
111.21
103.73
0.64
Main
121756 Inter
FLWY
612.00
409.90
415.39
415.39
416.18
0.011220
7.76
111.51
98.001
0.64
Main
21756 Inter
100yr FU
721.00
409.90
415.64
415.64
416.44
0.011209
8.04
139.75
116.74
0.65
Main
21735
100yr EX
612.00
409.00
414.67
414.67
415.83
0.008938
9.48
85.35
64.62
0.74
Main
21735
FLWY
612.00
409.00
414.63
414.63
415.83
0.009273
9.61
81.83
53.00
0.76
Main
21735
100yr FU
721.00
409.00
415.12
415.12
416.20
0.007999
9.49
118.81
86.45
0.71
Main
21686
100yr EX
612.00
407.00
412.40
413.22
0.006379
8.00
92.12
28.80
0.64
Main
21686
FLWY
612.00
407.00
412.39
413.21
0.006426
8.02
91.33
27.50
0.65
Main
21686
100yr FU
721.00
407.00
412.81
413.70
0.006293
8.39
104.24
30.13
0.65
Main
21662
100yr EX
612.00
406.38
412.29
413.04
0.006582
7.00
89.59
26.34
0.62
Main
21662
FLWY
612.00
406.38
412.28
413.04
0.006622
7.01
89.39
26.15
0.62
Main
21662
100yr FU
721.00
406.38
412.68
413.53
0.006587
7.45
100.24
27.76
0.63
Main
21632 Inter
100yr EX
612.00
406.91
411.21
411.21
412.68
0.017202
9.74
65.54
29.13
0.96
Main
21632 Inter
FLWY
612.00
406.91
411.23
411.23
412.68
0.016800
9.67
66.06
28.00
0.95
Main
21632 Inter
100yr FU
721.00
406.91
411.60
411.60
413.17
0.015922
10.12
77.51
32.41
0.95
Main
21587
100yr EX
612.00
404.00
408.97
409.74
0.006466
7.01
89.05
24.24
0.61
Main
21587
FLWY
612.00
404.00
408.95
409.72
0.006609
7.06
88.31
23.70
0.61
Main
21587
100yr FU
721.00
404.00
409.17
410.13
0.007672
7.88
93.85
24.59
0.67
Main
21026 Inter
100yr EX
877.00
398.00
404.57
404.57
405.63
0.007943
8.77
175.52
127.41
0.71
Main
21026 Inter
FLWY
877.00
398.00
404.58
404.58
405.62
0.007791
8.71
175.97
120.00
0.70
Main
21026 Inter
100yr FU
919.00
398.00
404.65
404.65
405.73
0.007966
8.89
186.57
129.45
0.71
Main
20859 345
100yr EX
877.00
396.56
403.58
401.15
403.99
0.002654
6.37
256.51
67.51
0.44
Main
20859 345
FLWY
877.00
396.56
403.59
401.15
403.99
0.002593
6.30
256.99
52.09
0.43
Main
20859 345
100yr FU
919.00
396.56
404.02
401.25
404.40
0.002290
6.17
282.27
88.88
0.41
Main
20746. 874
Culvert
Main
20652 Inter
100yr EX
877.00
392.00
400.39
395.51
400.51
0.000443
2.80
346.17
109.20
0.19
Main
20652 Inter
FLWY
877.00
392.00
400.42
395.51
400.55
0.000589
2.88
305.01
42.67
0.19
Main
20652 Inter
100yr FU
919.00
392.00
400.51
395.61
400.64
0.000459
2.89
353.46
111.31
0.19
Main
20472 625
100yr EX
1281.00
391.57
398.16
398.16
399.77
0.010031
12.58
194.17
57.75
0.88
Main
20472 625
FLWY
1281.00
391.57
398.17
398.17
399.76
0.009833
12.48
194.64
56.00
0.87
Main
20472 625
100yr FU
1327.00
391.57
398.24
398.24
399.89
0.010121
12.75
198.98
58.10
0.89
Main
20287 344
100yr EX
1281.00
387.58
395.48
394.54
396.58
0.007241
9.71
201.05
107.45
0.65
Main
20287 344
FLWY
1281.00
387.58
396.49
394.54
397.34
0.004612
8.48
212.10
50.00
0.53
Main
20287 344
100yr FU
1327.00
387.58
395.65
394.54
396.62
0.006461
9.32
218.91
109.14
0.61
Main
20243 Inter
100yr EX
1281.00
388.37
395.54
394.95
396.10
0.003416
7.02
292.59
124.84
0.50
Main
20243 Inter
FLWY
1281.00
388.37
396.45
394.86
397.06
0.002810
6.99
260.04
61.02
0.47
Main
20243 Inter
100yr FU
1327.00
388.37
395.68
395.02
396.20
0.003199
6.89
309.10
126.76
0.49
Main
20208. 875
Culvert
Main
20149 Inter
100yr EX
1281.00
388.00
393.25
393.25
394.37
0.008842
9.42
224.57
111.25
0.78
Main
20149 Inter
FLWY
1281.00
388.00
393.26
393.26
394.85
0.011226
10.62
159.76
56.00
0.88
Main
20149 Inter
100yr FU
1327.00
388.00
393.31
393.31
394.45
0.008890
9.53
231.32
111.79
0.79
Main
20101 Inter
100yr EX
1281.00
388.00
392.52
392.52
393.43
0.007662
7.93
172.52
93.77
0.71
Main
20101 Inter
FLWY
1281.00
388.00
392.54
392.54
393.97
0.011689
9.84
136.96
47.00
0.88
Main
20101 Inter
100yr FU
1327.00
388.00
392.55
392.55
393.50
0.007771
8.03
175.67
94.04
0.72
Main
19708 342
100yr EX
1281.00
380.11
386.92
386.92
387.58
0.007585
8.98
280.71
148.88
0.65
Main
19708 342
FLWY
1281.00
380.11
387.41
387.41
388.54
0.009483
10.59
185.15
62.23
0.73

HEC-RAS Plan: Exist-sury River: RockvBranch Reach: Main (Continued)
Reach
River Sta
Profile
Q Total
Min Ch El
W.S. Elev
Crit W.S.
E.G. Elev
E.G. Slope
Vel Chnl
Flow Area
Top Width
Froude # Chl
(cfs)
(ft)
(ft)
(ft)
(ft)
(ft/ft)
(ft/s)
(sq ft)
(ft)
Main
19708 342
100yr FU
1327.00
380.11
386.95
386.95
387.62
0.007730
9.10
285.53
149.29
0.65
Main
19030 Inter
100yr EX
1281.00
374.00
381.10
381.26
0.000658
3.24
414.66
119.44
0.23
Main
19030 Inter
FLWY
1281.00
374.00
381.65
381.86
0.000813
3.46
353.62
61.80
0.23
Main
19030 Inter
100yr FU
1 1327.00
374.00
381.19
381.36
0.000653
3.25
425.42
120.84
0.23
Main
18984 341
100yr EX
1281.00
371.49
380.92
377.19
381.19
0.001217
4.50
354.77
115.96
0.29
Main
18984 341
FLWY
1281.00
371.49
381.47
377.19
381.78
0.001207
4.70
331.69
65.00
0.30
Main
18984 341
100yr FU
1327.00
371.49
381.02
377.30
381.29
0.001212
4.53
365.53
117.69
0.29
Main
18923. 876
Culvert
Main
18864 Inter
100yr EX
1281.00
362.73
369.60
367.95
370.47
0.004314
7.60
190.14
43.03
0.56
Main
18864 Inter
FLWY
1281.00
362.73
369.74
367.90
370.66
0.005830
7.72
166.03
28.60
0.56
Main
18864 Inter
100yr FU
1327.00
362.73
370.00
368.05
370.79
0.003659
7.31
207.33
44.46
0.52
Main
18821 Inter
100yr EX
1281.00
362.00
369.59
370.18
0.002872
6.30
229.50
52.36
0.46
Main
18821 Inter
FLWY
1281.00
362.00
369.68
370.32
0.003802
6.451
198.73
33.49
0.47
Main
18821 Inter
100yr FU
1327.00
362.00
369.99
370.54
0.002429
6.06
251.23
54.53
0.43
Main
18560 340
100yr EX
1281.00
360.50
368.34
369.23
0.004452
8.93
243.09
55.39
0.58
Main
18560 340
FLWY
1281.00
360.50
368.35
369.23
0.004397
8.89
243.34
54.00
0.58
Main
18560 340
100yr FU
1327.00
360.50
369.10
369.80
0.003172
8.06
286.85
59.25
0.50
Main
18270 Inter
100yr EX
1281.00
360.00
367.76
368.21
0.002218
5.47
257.79
56.60
0.41
Main
18270 Inter
FLWY
1281.00
360.00
367.78
368.23
0.002188
5.45
258.10
54.00
0.40
Main
18270 Inter
100yr FU
1327.00
360.00
368.79
369.13
0.001326
4.73
318.47
61.12
0.32
Main
18223 339
100yr EX
1281.00
358.08
367.02
365.20
367.93
0.004326
8.75
232.36
49.74
0.55
Main
18223 339
FLWY
1281.00
358.08
367.07
365.20
367.96
0.004203
8.66
234.52
49.00
0.54
Main
18223 339
100yr FU
1327.00
358.08
368.36
365.32
368.96
0.002441
7.29
303.13
55.85
0.42
Main
18141. 877
Culvert
Main
18102 Inter
100yr EX
1281.00
358.00
364.48
362.16
365.02
0.002540
6.06
239.42
55.28
0.44
Main
18102 Inter
FLWY
1281.00
358.00
364.51
362.15
365.06
0.002565
6.10
240.53
46.60
0.44
Main
18102 Inter
100yr FU
1327.00
358.00
365.26
362.24
365.70
0.001771
5.49
275.47
57.51
0.38
Main
18043 Inter
100yr EX
1446.00
358.00
362.71
362.59
364.38
0.012340
10.56
153.47
46.69
0.91
Main
18043 Inter
FLWY
1446.00
358.00
362.77
362.53
364.43
0.011947
10.49
150.79
40.00
0.90
Main
18043 Inter
100yr FU
1499.00
358.00
364.75
365.47
0.003217
7.04
257.20
54.75
0.50
Main
17929 Inter
100yr EX
1446.00
356.00
362.04
363.22
0.006673
9.18
199.41
51.57
0.70
Main
17929 Inter
FLWY
1446.00
356.00
362.02
363.28
0.007010
9.39
186.20
41.00
0.72
Main
17929 Inter
100yr FU
1499.00
356.00
364.67
365.14
0.001640
5.95
350.84
63.28
0.37
Main
17838 338
100yr EX
1446.00
352.80
360.34
360.34
362.31
0.013448
13.65
185.50
48.35
0.91
Main
17838 338
FLWY
1446.00
352.80
360.30
360.30
362.33
0.013921
13.83
178.36
42.00
0.92
Main
17838 338
100yr FU
1499.00
352.80
364.57
364.97
0.001775
6.79
425.16
65.16
0.36
Main
17579 Inter
100yr EX
1446.00
352.00
359.51
359.98
0.001823
5.69
310.73
59.16
0.38
Main
17579 Inter
FLWY
1446.00
352.00
359.61
360.11
0.001869
5.81
285.66
45.00
0.39
Main
17579 Inter
100yr FU
1499.00
352.00
364.60
364.74
0.000278
3.22
664.15
97.89
0.16
Main
17392 879
100yr EX
1446.00
347.08
359.40
359.71
0.000813
4.96
438.05
62.16
0.26
Main
17392 879
FLWY
1446.00
347.08
359.50
359.83
0.000844
5.08
403.23
45.00
0.27
Main
17392 879
100yr FU
1499.00
347.08
364.56
364.69
0.000218
3.31
848.79
139.76
0.14
Main
17366 Inter
100yr EX
1446.00
347.00
359.40
353.86
359.67
0.000757
4.20
344.43
62.56
0.25
Main
17366 Inter
FLWY
1446.00
347.00
359.51
353.86
359.78
0.000728
4.15
348.59
63.06
0.24
Main
17366 Inter
100yr FU
1499.00
347.00
364.59
353.97
364.66
0.000125
2.30
1024.67
216.48
0.11
Main
17299 880
Culvert
Main
17231 Inter
100yr EX
1446.00
342.00
352.92
349.30
353.45
0.001991
5.97
294.03
54.82
0.37
Main
17231 Inter
FLWY
1446.00
342.00
352.96
349.30
353.48
0.001950
5.93
295.29
52.00
0.37
Main
17231 Inter
100yr FU
1499.00
342.00
353.16
349.40
353.68
0.001927
5.99
306.95
56.01
0.37
Main
17157 Inter
100yr EX
1446.00
342.00
351.77
353.02
0.004644
9.39
209.93
42.09
0.59
Main
17157 Inter
FLWY
1446.00
342.00
351.86
353.07
0.004448
9.25
211.18
38.00
0.58
Main
17157 Inter
100yr FU
1499.00
342.00
352.03
353.27
0.004422
9.36
221.05
43.19
0.58
Main
16910 881
100yr EX
1446.00
340.68
351.87
352.29
0.001061
5.31
330.24
47.40
0.30
Main
16910 881
FLWY
1446.00
340.68
351.95
352.36
0.001031
5.26
331.91
44.00
0.29
Main
16910 881
100yr FU
1499.00
340.68
352.13
352.56
0.001039
5.35
342.77
48.23
0.30
Main
16252 1nter
100yr EX
2180.00
336.00
352.10
342.11
352.13
0.000028
1.14
1596.85
356.93
0.05

HEC-RAS Plan: Exist-sury River: RockvBranch Reach: Main (Continued)
Reach
River Sta
Profile
Q Total
Min Ch El
W.S. Elev
Crit W.S.
E.G. Elev
E.G. Slope
Vel Chnl
Flow Area
Top Width
Froude # Chl
(cfs)
(ft)
(ft)
(ft)
(ft)
(ft/ft)
(ft/s)
(sq ft)
(ft)
Main
16252 Inter
FLWY
2180.00
336.00
352.07
342.11
352.14
0.000089
2.02
1077.40
101.28
0.09
Main
16252 Inter
100yr FU
2275.00
336.00
352.36
342.25
352.40
0.000028
1.14
1646.20
362.30
0.05
Main
16169 Inter
100yr EX
2180.00
336.00
351.72
343.49
352.05
0.000554
4.92
685.33
83.98
0.23
Main
16169 Inter
FLWY
1 2180.00
336.00
351.68
343.49
352.05
0.000605
5.13
607.15
65.00
0.24
Main
16169 Inter
100yr FU
2275.00
336.00
351.97
343.66
352.31
0.000562
5.01
706.81
85.55
0.23
Main
16157. 882
Bridge
Main
16135 335
100yr EX
2180.00
333.43
351.06
351.53
0.001011
5.81
509.15
59.47
0.26
Main
16135 335
FLWY
2180.00
333.43
351.06
351.54
0.0010081
5.80
509.06
58.42
0.26
Main
16135 335
100yr FU
2275.00
333.43
351.31
351.81
0.001033
5.94
524.41
59.94
0.27
Main
16096 Inter
100yr EX
2180.00
335.00
351.07
344.87
351.45
0.001005
5.09
484.70
81.82
0.28
Main
16096 Inter
FLWY
2180.00
335.00
351.07
344.87
351.45
0.001004
5.09
484.85
53.75
0.28
Main
16096 Inter
100yr FU
2275.00
335.00
351.33
345.06
351.71
0.000971
5.09
547.30
86.31
0.27
Main
15564. 334
Culvert
Main
15461 Inter
100yr EX
2180.00
325.00
333.14
331.72
334.18
0.005353
8.31
303.87
95.07
0.62
Main
15461 Inter
FLWY
2180.00
325.00
333.14
331.72
334.18
0.005377
8.32
299.86
76.51
0.62
Main
15461 Inter
100yr FU
2275.00
325.00
333.32
331.85
334.35
0.005183
8.34
320.92
98.32
0.61
Main
15344 Inter
100yr EX
2460.00
324.67
332.70
333.58
0.003750
8.00
416.50
88.27
0.55
Main
15344 Inter
FLWY
2460.00
324.67
332.67
333.59
0.003890
8.12
400.23
75.00
0.56
Main
15344 Inter
100yr FU
2570.00
324.67
332.88
333.78
0.003715
8.10
432.29
89.59
0.55
Main
15053 333
100yr EX
2460.00
321.94
329.28
329.28
331.60
0.012828
14.45
296.43
64.74
0.99
Main
15053 333
FLWY
2460.00
321.94
329.31
329.31
331.58
0.012538
14.33
298.02
63.00
0.98
Main
15053 333
100yr FU
2570.00
321.94
329.43
329.43
331.80
0.012822
14.66
306.15
65.40
0.99
Main
14520 332
100yr EX
2460.00
319.55
326.77
327.00
0.000990
3.96
697.13
151.11
0.28
Main
14520 332
FLWY
2460.00
319.55
326.76
326.99
0.000989
3.95
695.57
149.00
0.28
Main
14520 332
100yr FU
2570.00
319.55
326.99
327.22
0.000947
3.96
730.37
153.30
0.27
Main
14100 331
100yr EX
2460.00
316.03
326.08
326.44
0.001762
6.66
780.37
148.84
0.38
Main
14100 331
FLWY
2460.00
316.03
326.081
326.44
0.001731
6.60
771.05
140.00
0.37
Main
14100 331
100yr FU
2570.00
316.03
326.33
326.69
0.001691
6.63
817.39
149.88
0.37
Main
14053 Inter
100yr EX
2460.00
316.42
325.56
322.91
326.24
0.002751
7.83
505.60
89.57
0.48
Main
14053 Inter
FLWY
2460.00
316.42
325.56
322.96
326.24
0.002729
7.79
490.69
76.50
0.48
Main
14053 Inter
100yr FU
2570.00
316.42
325.80
323.05
326.49
0.002677
7.87
527.22
91.05
0.48
Main
14001. 884
Bridge
Main
13896 Inter
100yr EX
2460.00
314.10
321.08
321.08
322.49
0.008710
11.12
383.77
141.61
0.80
Main
13896 Inter
FLWY
2460.00
314.10
321.10
321.10
323.26
0.011584
12.85
258.34
60.00
0.93
Main
13896 Inter
100yr FU
2570.00
314.10
321.17
321.17
322.61
0.008810
11.30
395.44
142.45
0.81
Main
13776 885
100yr EX
2603.00
311.08
320.80
319.12
321.21
0.001679
6.23
830.65
260.96
0.41
Main
13776 885
FLWY
2603.00
311.08
320.91
319.12
321.34
0.001650
6.24
780.26
210.00
0.41
Main
13776 885
100yr FU
2727.00
311.08
320.89
319.22
321.32
0.001720
6.36
854.97
261.71
0.41
Main
13723 886
Bridge
Main
13704 Inter
100yr EX
2603.00
312.00
319.03
319.03
320.10
0.005502
8.92
466.78
271.82
0.70
Main
13704 Inter
FLWY
2603.00
312.00
319.04
319.04
320.10
0.005427
8.88
470.25
271.00
0.69
Main
13704 Inter
100yr FU
2727.00
312.00
319.12
319.12
320.20
0.005471
9.01
493.02
273.18
0.70
Main
13634 Inter
100yr EX
2603.00
310.00
317.38
317.38
318.38
0.005465
9.22
513.48
264.37
0.70
Main
13634 Inter
FLWY
2603.00
310.00
317.42
317.42
318.38
0.005288
9.11
517.46
256.00
0.69
Main
13634 Inter
100yr FU
2727.00
310.00
317.46
317.46
318.47
0.005535
9.37
533.06
264.86
0.71
Main
12719 Inter
100yr EX
2603.00
302.50
314.88
314.97
0.000315
2.93
1180.79
324.33
0.16
Main
12719 Inter
FLWY
2603.00
302.50
315.86
316.00
0.000306
3.08
893.70
144.00
0.16
Main
12719 Inter
100yr FU
2727.00
302.50
314.99
315.08
0.000320
2.98
1215.29
328.45
0.17
Main
12678 328
100yr EX
2603.00
300.21
314.80
308.09
314.94
0.000349
3.20
945.37
293.06
0.17
Main
12678 328
FLWY
2603.00
300.21
315.65
308.09
315.94
0.000582
4.34
674.13
80.00
0.22
Main
12678 328
100yr FU
2727.00
300.21
314.90
308.30
315.05
0.000355
3.24
975.88
301.37
0.17
Main
12658. 887
Culvert
Main
12623 888
100yr EX
2603.00
298.58
311.91
306.19
312.38
0.001318
5.59
548.03
120.67
0.32
Main
12623 888
FLWY
2603.00
298.58
312.06
306.22
312.52
0.001249
5.50
530.47
80.00
0.31
Main
12623 888
100yr FU
2727.00
298.58
312.04
306.40
312.53
0.001367
5.75
564.31
125.20
0.32

HEC-RAS Plan: Exist-sury River: RockvBranch Reach: Main (Continued)
Reach
River Sta
Profile
Q Total
Min Ch El
W.S. Elev
Crit W.S.
E.G. Elev
E.G. Slope
Vel Chnl
Flow Area
Top Width
Froude # Chl
(cfs)
(ft)
(ft)
(ft)
(ft)
(ft/ft)
(ft/s)
(sq ft)
(ft)
Main
12602. 889
Culvert
Main
12489 87
100yr EX
2603.00
296.00
309.46
309.46
310.64
0.003529
10.32
458.34
151.65
0.53
Main
12489 87
FLWY
2603.00
296.00
309.46
309.46
310.63
0.003507
10.29
457.57
145.00
0.53
Main
12489 87
100yr FU
1 2727.00
296.00
309.56
309.56
310.75
0.003576
10.45
474.20
154.10
0.54
Main
12326 890
100yr EX
2603.00
290.55
306.83
299.63
307.17
0.000708
5.63
797.27
153.12
0.26
Main
12326 890
FLWY
2603.00
290.55
307.46
299.63
307.78
0.000617
5.40
773.89
103.00
0.24
Main
12326 890
100yr FU
2727.00
290.55
307.01
299.84
307.35
0.000710
5.68
825.28
155.47
0.26
Main
12185 891
Culvert
Main
12079 Inter
100yr EX
2603.00
290.00
298.52
295.75
299.46
0.003118
7.88
375.25
67.44
0.50
Main
12079 Inter
FLWY
2603.00
290.00
298.64
295.74
299.58
0.003012
7.83
361.25
55.00
0.49
Main
12079 Inter
100yr FU
2727.00
290.00
299.20
295.90
300.05
0.002548
7.54
422.47
71.54
0.46
Main
12018 Inter
100yr EX
2603.00
290.00
298.48
299.18
0.002231
6.74
421.89
68.40
0.41
Main
12018 Inter
FLWY
2603.00
290.00
298.60
299.31
0.002194
6.741
390.15
47.00
0.41
Main
12018 Inter
100yr FU
2727.00
290.00
299.17
299.81
0.001853
6.48
471.30
74.36
0.38
Main
11569 326
100yr EX
2780.00
283.34
296.91
297.51
0.006671
6.24
445.19
58.71
0.40
Main
11569 326
FLWY
2780.00
283.34
296.95
297.74
0.006076
7.10
391.45
38.20
0.39
Main
11569 326
100yr FU
3160.00
283.34
297.69
298.33
0.006480
6.42
492.95
63.41
0.40
Main
11033 325
100yr EX
2780.00
279.76
291.67
292.68
0.012583
8.09
343.77
45.49
0.52
Main
11033 325
FLWY
2780.00
279.76
291.72
293.05
0.013218
9.28
299.65
29.00
0.51
Main
11033 325
100yr FU
3160.00
279.76
292.41
293.49
0.013141
8.35
378.52
47.76
0.52
Main
10503 324
100yr EX
2780.00
275.32
289.82
290.14
0.002221
4.56
609.77
60.91
0.25
Main
10503 324
FLWY
2780.001
275.32
290.17
290.53
0.002042
4.801
579.70
46.00
0.24
Main
10503 324
100yr FU
3160.00
275.32
290.25
290.64
0.002612
4.96
636.52
61.98
0.27
Main
10080 Inter
100yr EX
2780.00
276.00
289.55
281.87
289.76
0.000425
3.69
908.99
131.56
0.20
Main
10080 Inter
FLWY
2780.00
276.00
289.97
281.87
290.16
0.000386
3.60
860.54
87.00
0.19
Main
10080 Inter
100yr FU
3160.00
276.00
289.95
282.33
290.19
0.000483
4.03
962.52
136.73
0.21
Main
9962 323
100yr EX
2780.00
271.66
289.52
278.81
289.66
0.000680
3.05
1004.71
160.03
0.16
Main
9962 323
FLWY
2780.00
271.66
289.94
278.80
290.08
0.000619
2.97
978.14
99.00
0.15
Main
9962 323
100yr FU
3160.00
271.66
289.92
279.31
290.08
0.000783
3.31
1070.42
171.25
0.17
Main
9911 892
Culvert
Main
9727 85
100yr EX
2780.00
270.00
286.22
279.00
286.37
0.000232
2.62
1241.70
310.62
0.12
Main
9727 85
FLWY
2780.00
270.00
286.78
279.00
287.05
0.000315
3.13
823.75
78.21
0.14
Main
9727 85
100yr FU
3160.00
270.00
286.68
279.32
286.85
0.000254
2.79
1314.17
325.57
0.12
Main
9612 893
100yr EX
3084.00
267.86
286.19
278.04
286.31
0.000458
3.89
1514.90
506.24
0.16
Main
9612 893
FLWY
3084.00
267.86
286.67
278.04
286.98
0.000813
5.28
792.82
105.00
0.22
Main
9612 893
100yr FU
3625.00
267.86
286.661
279.01
286.78
0.000473
4.02
1681.98
511.93
0.17
Main
9566 322
Culvert
Main
9085 Inter
100yr EX
3084.00
266.00
273.37
272.11
274.43
0.005134
8.61
470.35
165.76
0.62
Main
9085 Inter
FLWY
3084.00
266.00
274.33
272.11
275.11
0.003070
7.36
528.40
95.00
0.49
Main
9085 Inter
100yr FU
3625.00
266.00
274.04
272.65
275.15
0.004758
8.90
554.34
199.64
0.61
Main
8986 Inter
100yr EX
3209.00
264.00
272.96
271.88
273.90
0.004552
9.18
567.82
217.31
0.60
Main
8986 Inter
FLWY
3209.00
264.00
273.73
271.78
274.71
0.003789
8.96
494.22
80.00
0.56
Main
8986 Inter
100yr FU
3793.00
264.00
273.71
272.41
274.63
0.004027
9.22
686.89
250.13
0.57
Main
8848 Inter
100yr EX
3209.00
261.00
272.08
270.56
272.82
0.003521
7.93
593.27
223.98
0.49
Main
18848 Inter
FLWY
3209.001
261.00
272.90
270.41
273.78
0.0033091
8.20
497.641
75.00
0.48
Main
8848 Inter
100yr FU
3793.00
261.00
272.981
271.00
273.67
0.003026
7.89
716.83
246.76
0.46
Main
8729 321
100yr EX
3209.00
261.37
271.59
269.68
272.42
0.002996
8.35
569.55
210.39
0.50
Main
8729 321
FLWY
3209.00
261.37
271.65
269.49
273.24
0.004653
10.45
351.43
45.00
0.62
Main
8729 321
100yr FU
3793.00
261.37
272.46
270.20
273.31
0.002780
8.57
670.15
250.01
0.49
Main
8638 Inter
100yr EX
3209.00
258.40
270.09
266.84
271.19
0.002934
8.71
455.13
142.17
0.49
Main
8638 Inter
FLWY
3209.00
258.40
270.46
266.73
271.67
0.002896
8.88
383.41
40.00
0.49
Main
8638 Inter
100yr FU
3793.00
258.40
270.79
267.63
272.07
0.003133
9.43
510.77
170.63
0.52
Main
8327 320
100yr EX
3209.00
257.33
269.81
265.64
270.38
0.001540
6.65
740.52
279.63
0.37
Main
8327 320
FLWY
3209.00
257.33
270.06
265.64
270.84
0.001806
7.31
497.65
58.70
0.40
Main
8327 320
100yr FU
3793.00
257.33
270.69
266.36
271.22
0.001372
6.63
919.77
281.19
0.35
Main
8052 319
100yr EX
3209.00
255.29
269.681
263.16
269.97
0.000678
4.46
813.11
161.03
0.24

HEC-RAS Plan: Exist-sury River: RockvBranch Reach: Main (Continued)
Reach
River Sta
Profile
Q Total
Min Ch El
W.S. Elev
Crit W.S.
E.G. Elev
E.G. Slope
Vel Chnl
Flow Area
Top Width
Froude # Chl
(cfs)
(ft)
(ft)
(ft)
(ft)
(ft/ft)
(ft/s)
(sq ft)
(ft)
Main
8052 319
FLWY
3209.00
255.29
269.98
263.16
270.32
0.000728
4.70
712.62
72.13
0.25
Main
8052 319
100yr FU
3793.00
255.29
270.58
263.78
270.85
0.000612
4.47
995.44
245.36
0.23
Main
7933 895
Culvert
Main
7864 Inter
100yr EX
3209.00
255.00
264.26
265.45
0.005119
8.75
366.86
57.60
0.61
Main
7864 Inter
FLWY
3209.00
255.00
264.28
265.47
0.005071
8.73
367.91
57.60
0.60
Main
7864 Inter
100yr FU
3793.00
255.00
264.66
266.14
0.005857
9.74
390.22
59.21
0.65
Main
7407 318
100yr EX
3209.00
250.94
260.31
260.31
262.36
0.007719
12.28
410.25
137.65
0.78
Main
17407 318
FLWY
3209.00
250.94
261.00
262.79
0.0059241
11.39
377.97
65.00
0.69
Main
7407 318
100yr FU
3793.00
250.94
261.04
261.04
263.04
0.007098
12.50
517.01
155.44
0.75
Main
6964 317
100yr EX
3209.00
247.94
258.99
259.25
0.001323
5.59
945.32
230.86
0.32
Main
6964 317
FLWY
3209.00
247.94
259.45
260.49
0.003767
9.74
540.80
90.00
0.54
Main
6964 317
100yr FU
3793.00
247.94
259.67
259.93
0.001177
5.52
1105.96
237.11
0.30
Main
6530 Inter
100yr EX
3209.00
247.41
255.27
255.27
257.75
0.011302
12.83
287.74
79.70
0.92
Main
6530 Inter
FLWY
3209.00
247.41
255.30
255.30
257.74
0.011045
12.73
287.33
71.00
0.91
Main
6530 Inter
100yr FU
3793.00
247.41
256.13
256.13
258.59
0.009611
12.93
364.16
96.22
0.87
Main
6377 316
100yr EX
3513.00
242.93
254.83
251.16
255.73
0.004093
7.66
471.47
63.91
0.46
Main
6377 316
FLWY
3513.00
242.93
254.87
251.17
255.77
0.004040
7.63
469.65
58.00
0.46
Main
6377 316
100yr FU
4109.00
242.93
256.06
251.84
256.99
0.003563
7.80
553.97
74.92
0.44
Main
6299 896
Culvert
Main
6218 Inter
100yr EX
3513.00
242.00
251.81
248.00
252.46
0.002194
6.54
566.49
120.90
0.41
Main
6218 Inter
FLWY
3513.00
242.00
251.96
248.01
252.65
0.002231
6.67
541.64
76.16
0.41
Main
6218 Inter
100yr FU
4109.00
242.00
253.29
248.64
253.76
0.001332
5.70
755.96
132.77
0.33
Main
5869 315
100yr EX
3352.00
238.16
251.73
251.89
0.000496
4.09
1700.34
333.59
0.21
Main
5869 315
FLWY
3352.00
238.16
251.76
252.03
0.000699
4.87
1118.34
143.58
0.25
Main
5869 315
100yr FU
3825.00
238.16
253.26
253.37
0.000322
3.58
2349.48
468.23
0.17
Main
5613 Inter
100yr EX
3352.00
240.00
251.71
251.77
0.000249
2.88
2518.74
421.21
0.15
Main
5613 Inter
FLWY
3352.00
240.00
251.72
251.86
0.000430
3.78
1535.91
186.19
0.20
Main
5613 Inter
100yr FU
3825.00
240.00
253.25
253.29
0.000170
2.59
3195.29
466.33
0.13
Main
5346 314
100yr EX
3352.00
238.69
251.31
247.37
251.60
0.000853
5.35
1162.78
656.13
0.27
Main
5346 314
FLWY
3352.00
238.69
251.35
247.37
251.65
0.000877
5.44
1170.07
170.76
0.28
Main
5346 314
100yr FU
3825.00
238.69
252.94
247.75
253.16
0.000607
4.92
1440.39
668.52
0.24
Main
5158 397
Culvert
Main
5008 313
100yr EX
3352.00
235.08
246.75
244.26
247.31
0.002017
6.47
623.41
527.47
0.40
Main
5008 313
FLWY
3352.00
235.08
246.81
244.24
247.37
0.001938
6.38
620.56
179.26
0.39
Main
5008 313
100yr FU
3825.00
235.08
247.11
244.99
247.67
0.001928
6.51
700.28
549.08
0.39
Main
5000 898
Bridge
Main
4974 Inter
100yr EX
3352.00
235.08
243.66
242.67
244.48
0.004116
7.96
679.39
322.93
0.56
Main
4974 Inter
FLWY
3352.00
235.08
244.61
242.80
245.17
0.002095
6.24
798.31
194.49
0.41
Main
4974 Inter
100yr FU
3825.00
235.08
244.17
243.18
244.89
0.003381
7.61
822.74
367.43
0.52
Main
4472 312
100yr EX
3368.00
233.90
243.67
243.72
0.000302
2.51
2884.48
637.24
0.16
Main
4472 312
FLWY
3368.00
233.90
244.08
244.30
0.000981
4.67
1382.66
220.00
0.28
Main
4472 312
100yr FU
3846.00
233.90
244.16
244.21
0.000289
2.55
3202.56
661.97
0.15
Main
3983 Inter
100yr EX
3368.00
231.50
242.03
243.23
0.003955
9.45
518.99
145.12
0.57
Main
3983 Inter
FLWY
3368.00
231.50
242.22
243.37
0.003663
9.23
514.02
105.00
0.55
Main
3983 Inter
100yr FU
3846.00
231.50
242.49
243.73
0.003953
9.78
586.86
149.39
0.58
Main
3851 311
100yr EX
3532.00
230.79
241.44
239.81
242.61
0.005292
8.78
470.24
170.89
0.61
Main
3851 311
FLWY
3532.00
230.79
241.75
239.81
242.77
0.004399
8.26
508.78
140.00
0.56
Main
3851 311
100yr FU
4046.00
230.79
241.58
240.31
243.02
0.006363
9.77
494.45
178.27
0.68
Main
3810 899
Culvert
Main
3760 Inter
100yr EX
3532.00
230.00
239.68
239.68
241.06
0.006496
10.29
472.52
202.57
0.65
Main
3760 Inter
FLWY
3532.00
230.00
239.69
239.69
241.06
0.006423
10.24
474.11
192.44
0.64
Main
3760 Inter
100yr FU
4046.00
230.00
240.01
239.94
241.46
0.006741
10.77
544.34
359.44
0.66
Main
3594 900
100yr EX
3617.00
230.02
237.87
237.87
239.45
0.008492
11.08
512.99
188.42
0.79
Main
3594 900
FLWY
3617.00
230.02
238.25
237.86
239.49
0.006365
9.99
573.32
174.25
0.69
Main
3594 900
100yr FU
4152.00
230.02
239.85
238.50
240.36
0.002388
7.09
1061.09
319.03
0.44

HEC-RAS Plan: Exist-sury River: RockvBranch Reach: Main (Continued)
Reach
River Sta
Profile
Q Total
Min Ch El
W.S. Elev
Crit W.S.
E.G. Elev
E.G. Slope
Vel Chnl
Flow Area
Top Width
Froude # Chl
(cfs)
(ft)
(ft)
(ft)
(ft)
(ft/ft)
(ft/s)
(sq ft)
(ft)
Main
3590 901
Bridge
Main
3565 Inter
100yr EX
3617.00
230.00
237.17
237.90
0.004027
8.38
790.06
260.35
0.57
Main
3565 Inter
FLWY
3617.00
230.00
238.15
238.79
0.002826
7.68
801.73
147.31
0.49
Main
3565 Inter
100yr FU
1 4152.00
230.00
237.43
238.23
0.004294
8.87
860.94
272.43
0.59
Main
3291 310
100yr EX
3617.00
227.26
236.40
236.95
0.002474
7.20
843.25
341.60
0.44
Main
3291 310
FLWY
3617.00
227.26
236.94
237.87
0.003242
8.60
716.43
180.39
0.51
Main
3291 310
100yr FU
4152.00
227.26
236.59
237.20
0.002722
7.67
910.73
343.07
0.47
Main
2881 309
100yr EX
3617.00
226.54
235.59
234.82
235.91
0.002028
5.77
1014.27
367.69
0.38
Main
2881 309
FLWY
3617.00
226.54
235.83
234.59
236.40
0.003054
7.23
873.64
215.88
0.47
Main
2881 309
100yr FU
4152.00
226.54
235.49
235.00
235.96
0.002987
6.94
976.98
363.01
0.46
Main
2868 902
Bridge
Main
2835 Inter
100yr EX
3617.00
226.00
234.80
233.88
235.52
0.003894
8.06
964.98
429.49
0.53
Main
2835 Inter
FLWY
3617.00
226.00
235.78
233.85
236.33
0.002480
7.00
992.20
214.71
0.43
Main
2835 Inter
100yr FU
4152.00
226.00
235.23
234.54
235.90
0.003584
8.03
1151.87
440.06
0.51
Main
2258 308
100yr EX
3193.00
222.91
234.42
234.48
0.000544
3.16
2177.70
634.84
0.19
Main
2258 308
FLWY
3193.00
222.91
235.03
235.21
0.001079
4.66
1369.98
254.62
0.27
Main
2258 308
100yr FU
3497.00
222.91
234.96
235.01
0.000408
2.85
2524.59
651.17
0.17
Main
1788 307
100yr EX
3193.00
224.33
234.25
234.29
0.000301
2.50
3295.12
656.08
0.15
Main
1788 307
FLWY
3193.00
224.33
234.65
234.78
0.000754
4.08
1688.08
257.88
0.24
Main
1788 307
100yr FU
3497.00
224.33
234.82
234.85
0.000258
2.42
3674.30
678.11
0.14
Main
1366 306
100yr EX
3193.00
224.00
234.17
234.19
0.000166
2.04
4004.34
707.08
0.12
Main
1366 306
FLWY
3193.00
224.00
234.34
234.47
0.000687
4.20
1666.07
225.00
0.24
Main
1366 306
100yr FU
3497.00
224.00
234.75
234.77
0.000148
2.00
4417.60
722.00
0.11
Main
876 305
100yr EX
3193.00
221.20
233.31
229.38
233.84
0.001701
6.53
722.00
177.83
0.36
Main
876 305
FLWY
3193.00
221.20
233.31
229.38
233.84
0.001701
6.53
721.96
93.89
0.36
Main
876 305
100yr FU
3497.00
221.20
233.88
229.68
234.43
0.001656
6.68
775.34
192.30
0.36
Main
779 903
Culvert
Main
666 Inter
100yr EX
3193.00
221.20
229.49
229.39
231.59
0.008615
12.18
363.35
146.12
0.86
Main
666 Inter
FLWY
3193.00
221.20
229.49
229.41
231.70
0.008916
12.40
348.06
88.86
0.88
Main
666 Inter
100yr FU
3497.00
221.20
229.68
229.68
231.99
0.009217
12.85
380.81
147.54
0.90
Main
370 304
100yr EX
3206.00
216.65
225.30
225.25
228.31
0.012014
14.06
261.90
75.00
0.93
Main
370 304
FLWY
3206.00
216.65
225.33
225.08
228.39
0.012009
14.10
240.43
38.00
0.93
Main
370 304
100yr FU
3512.00
216.65
226.87
226.87
228.59
0.005842
11.21
594.73
280.49
0.67

Proposed Conditions 100-year and FW

HEC-RAS Plan: Proposed River: RockvBranch Reach: Main
Reach
River Sta
Profile
Q Total
Min Ch El
W.S. Elev
Crit W.S.
E.G. Elev
E.G. Slope
Vel Chnl
Flow Area
Top Width
Froude # Chl
(cfs)
(ft)
(ft)
(ft)
(ft)
(ft/ft)
(ft/s)
(sq ft)
(ft)
Main
23338 Inter
100yr EX
647.00
432.00
442.55
436.69
442.55
0.000004
0.30
2311.09
668.49
0.02
Main
23338 Inter
FLWY
647.00
432.00
443.32
436.64
443.33
0.000019
0.70
752.07
112.08
0.04
Main
23338 Inter
100yr FU
743.00
432.00
442.68
437.25
442.68
0.000005
0.33
2394.20
673.98
0.02
Main
23244. Inter
Culvert
Main
23069 Inter
100yr EX
647.00
432.00
442.54
436.61
442.55
0.000101
1.42
1057.11
477.55
0.09
Main
23069 Inter
FLWY
647.00
432.00
443.29
436.61
443.32
0.000099
1.49
683.70
112.08
0.09
Main
23069 Inter
100yr FU
743.00
432.00
442.65
436.94
442.67
0.000122
1.57
1113.39
481.73
0.10
Main
23025 349
100yr EX
647.00
430.47
442.531
442.55
0.0000941
1.38
1127.01
489.00
0.08
Main
23025 349
FLWY
647.00
430.47
443.29
443.31
0.000105
1.40
625.19
91.79
0.08
Main
23025 349
100yr FU
743.00
430.47
442.65
442.67
0.000113
1.53
1184.20
493.53
0.09
Main
22944 868
100yr EX
647.00
429.18
442.50
436.03
442.53
0.000198
2.02
1088.67
548.19
0.11
Main
22944 868
FLWY
647.00
429.18
443.19
436.03
443.28
0.000350
2.80
430.86
70.00
0.15
Main
22944 868
100yr FU
743.00
429.18
442.61
436.46
442.65
0.000229
2.19
1150.99
552.72
0.12
Main
22904. 869
Culvert
Main
22814 Inter
100yr EX
647.00
427.00
431.59
430.78
432.27
0.007590
6.63
98.34
33.31
0.66
Main
22814 Inter
FLWY
647.00
427.00
431.73
430.78
432.36
0.006970
6.35
101.85
30.74
0.62
Main
22814 Inter
100yr FU
743.00
427.00
431.68
431.04
432.53
0.009071
7.39
101.51
33.70
0.72
Main
22712 Inter
100yr EX
612.00
426.00
430.04
429.91
431.14
0.013590
8.55
90.69
82.37
0.88
Main
22712 Inter
FLWY
612.00
426.00
430.46
431.38
0.011226
7.71
79.34
23.85
0.75
Main
22712 Inter
100yr FU
721.00
426.00
430.43
430.43
431.45
0.011245
8.45
122.99
84.24
0.82
Main
22608 348
100yr EX
612.00
421.54
429.70
427.72
430.02
0.004258
4.62
160.88
101.15
0.47
Main
22608 348
FLWY
612.00
421.54
430.27
427.73
430.52
0.002832
4.04
151.53
41.90
0.37
Main
22608 348
100yr FU
721.00
421.54
429.79
428.77
430.20
0.005304
5.26
170.12
106.19
0.52
Main
22578. 870
Culvert
Main
22536 Inter
100yr EX
612.00
422.00
426.12
425.89
427.20
0.012996
8.39
76.42
32.03
0.87
Main
22536 Inter
FLWY
612.00
422.00
426.63
425.87
427.43
0.008965
7.18
85.24
24.97
0.69
Main
22536 Inter
100yr FU
721.00
422.00
426.45
426.20
427.65
0.012455
8.83
87.35
33.94
0.87
Main
22507 Inter
100yr EX
612.00
422.00
426.08
426.74
0.006268
6.63
105.62
41.39
0.63
Main
22507 Inter
FLWY
612.00
422.00
426.55
427.12
0.005509
6.02
101.66
25.90
0.54
Main
22507 Inter
100yr FU
721.00
422.00
426.44
427.17
0.006144
7.01
120.83
43.62
0.63
Main
22422 Inter
100yr EX
612.00
420.00
425.70
426.27
0.004420
6.21
124.17
50.76
0.54
Main
22422 Inter
FLWY
612.00
420.00
426.12
426.67
0.004811
5.95
102.89
22.47
0.49
Main
22422 Inter
100yr FU
721.00
420.00
426.00
424.77
426.69
0.004851
6.83
141.08
79.06
0.57
Main
22362 Inter
100yr EX
612.00
420.00
424.85
423.96
425.87
0.007981
8.41
106.49
72.14
0.72
Main
22362 Inter
FLWY
612.00
420.00
425.00
426.17
0.012181
8.68
70.49
15.97
0.73
Main
22362 Inter
100yr FU
721.00
420.00
425.23
424.97
426.29
0.007628
8.70
136.83
85.97
0.71
Main
22285 871
100yr EX
612.00
417.40
424.51
422.63
424.98
0.008104
5.48
111.62
33.28
0.52
Main
22285 871
FLWY
612.00
417.40
424.66
422.64
425.09
0.007296
5.27
116.20
31.05
0.48
Main
22285 871
100yr FU
721.00
417.40
424.96
423.03
425.43
0.007045
5.54
136.09
83.55
0.49
Main
22243 872
Culvert
Main
22070 Inter
100yr EX
612.00
416.00
421.30
419.32
421.46
0.001422
3.71
346.55
180.59
0.31
Main
22070 Inter
FLWY
612.00
416.00
421.65
419.34
421.93
0.002104
4.38
164.94
36.80
0.35
Main
22070 Inter
100yr FU
721.00
416.00
421.50
419.56
421.68
0.001585
4.04
383.30
186.25
0.33
Main
22050 347
100yr EX
612.00
413.75
421.21
421.41
0.002124
4.84
319.92
167.19
0.33
Main
22050 347
FLWY
612.00
413.75
421.51
421.86
0.002758
5.69
184.32
47.34
0.38
Main
22050 347
100yr FU
721.00
413.75
421.40
421.63
0.002421
5.27
352.24
173.39
0.36
Main
22015 Inter
100yr EX
612.00
414.00
421.21
419.15
421.31
0.000824
3.03
336.14
164.32
0.23
Main
22015 Inter
FLWY
612.00
414.00
421.54
419.16
421.70
0.001182
3.78
264.56
70.00
0.28
Main
22015 Inter
100yr FU
721.00
414.00
421.41
419.48
421.52
0.000910
3.26
369.58
180.63
0.25
Main
21972. 873
Culvert
Main
21927 Inter
100yr EX
612.00
414.00
418.54
418.54
419.06
0.005452
6.67
215.65
227.95
0.59
Main
21927 Inter
FLWY
612.00
414.00
418.54
418.54
419.25
0.006761
7.43
154.58
130.00
0.66
Main
21927 Inter
100yr FU
721.00
414.00
418.70
418.70
419.23
0.005716
7.01
252.46
238.27
0.61
Main
21817
100yr EX
612.00
411.95
416.69
416.65
417.42
0.008932
7.89
159.76
125.05
0.73
Main
21817
FLWY
612.00
411.95
416.69
416.65
417.41
0.008901
7.88
158.41
119.00
0.73
Main
21817
100yr FU
721.00
411.95
417.13
416.89
417.71
0.006745
7.40
218.73
144.07
0.65

HEC-RAS Plan: Proposed River: RockvBranch Reach: Main (Continued)
Reach
River Sta
Profile
Q Total
Min Ch El
W.S. Elev
Crit W.S.
E.G. Elev
E.G. Slope
Vel Chnl
Flow Area
Top Width
Froude # Chl
(cfs)
(ft)
(ft)
(ft)
(ft)
(ft/ft)
(ft/s)
(sq ft)
(ft)
Main
21789
100yr EX
612.00
411.00
416.58
416.23
417.21
0.005946
7.29
170.02
103.83
0.61
Main
21789
FLWY
612.00
411.00
416.58
416.22
417.19
0.005923
7.27
169.40
99.80
0.60
Main
21789
100yr FU
721.00
411.00
416.50
416.48
417.43
0.009049
8.89
161.95
100.62
0.75
Main
21786.1
Bridge
Main
21783
100yr EX
612.00
410.98
416.78
417.18
0.003935
5.89
205.62
116.52
0.49
Main
21783
FLWY
612.00
410.98
416.77
417.16
0.003911
5.87
201.10
102.65
0.49
Main
21783
100yr FU
721.00
410.98
416.93
417.40
0.004590
6.51
223.50
119.31
0.53
Main
21774
100yr EX
612.00
410.96
416.35
416.35
417.04
0.007367
8.29
183.89
127.65
0.66
Main
21774
FLWY
612.00
410.96
416.37
416.37
417.04
0.007109
8.16
186.07
125.00
0.65
Main
21774
100yr FU
721.00
410.96
416.53
416.53
417.27
0.007892
8.80
208.04
130.29
0.69
Main
21756 Inter
100yr EX
612.00
410.00
414.32
414.32
415.89
0.015814
10.11
65.36
27.41
0.94
Main
121756 Inter
FLWY
612.00
410.00
414.34
414.34
415.89
0.015412
10.03
66.08
27.691
0.93
Main
21756 Inter
100yr FU
721.00
410.00
414.75
414.75
416.41
0.014591
10.48
78.39
33.19
0.92
Main
21735
100yr EX
612.00
408.64
412.80
412.80
414.20
0.018771
9.48
64.60
24.00
1.01
Main
21735
FLWY
612.00
408.64
412.81
412.81
414.20
0.018569
9.45
64.81
23.85
1.00
Main
21735
100yr FU
721.00
408.64
413.15
413.15
414.67
0.017534
9.91
73.13
25.50
1.00
Main
21686
100yr EX
612.00
408.00
411.71
411.71
413.02
0.017593
9.20
67.23
27.32
0.99
Main
21686
FLWY
612.00
408.00
411.72
411.72
413.02
0.017340
9.16
67.50
26.75
0.98
Main
21686
100yr FU
721.00
408.00
412.05
412.05
413.47
0.016302
9.58
76.73
28.71
0.97
Main
21662
100yr EX
612.00
406.50
410.48
410.48
411.83
0.017618
9.34
65.88
25.49
0.99
Main
21662
FLWY
612.00
406.50
410.48
410.48
411.83
0.017486
9.32
66.01
25.00
0.98
Main
21662
100yr FU
721.00
406.50
410.81
410.81
412.30
0.016671
9.80
74.60
26.94
0.98
Main
21632 Inter
100yr EX
612.00
405.25
409.43
409.43
410.71
0.018387
9.05
68.00
28.14
1.00
Main
21632 Inter
FLWY
612.00
405.25
409.43
409.43
410.71
0.018496
9.06
67.82
27.50
1.00
Main
21632 Inter
100yr FU
721.00
405.25
409.72
409.72
411.14
0.017811
9.56
76.34
29.34
1.00
Main
21587
100yr EX
612.00
404.00
408.97
409.74
0.006466
7.01
89.05
24.24
0.61
Main
21587
FLWY
612.00
404.00
408.95
409.73
0.006635
7.08
87.10
21.70
0.61
Main
21587
100yr FU
721.00
404.00
409.17
410.13
0.007672
7.88
93.85
24.59
0.67
Main
21026 Inter
100yr EX
877.00
398.00
404.57
404.57
405.63
0.007943
8.77
175.52
127.41
0.71
Main
21026 Inter
FLWY
877.00
398.00
404.58
404.58
405.62
0.007791
8.71
175.97
120.00
0.70
Main
21026 Inter
100yr FU
919.00
398.00
404.65
404.65
405.73
0.007966
8.89
186.57
129.45
0.71
Main
20859 345
100yr EX
877.00
396.56
403.58
401.15
403.99
0.002654
6.37
256.51
67.51
0.44
Main
20859 345
FLWY
877.00
396.56
403.59
401.15
403.99
0.002593
6.30
256.99
52.09
0.43
Main
20859 345
100yr FU
919.00
396.56
404.02
401.25
404.40
0.002290
6.17
282.27
88.88
0.41
Main
20746. 874
Culvert
Main
20652 Inter
100yr EX
877.00
392.00
400.39
395.51
400.51
0.000443
2.80
346.17
109.20
0.19
Main
20652 Inter
FLWY
877.00
392.00
400.42
395.51
400.55
0.000589
2.88
305.01
42.67
0.19
Main
20652 Inter
100yr FU
919.00
392.00
400.51
395.61
400.64
0.000459
2.89
353.46
111.31
0.19
Main
20472 625
100yr EX
1281.00
391.57
398.16
398.16
399.77
0.010031
12.58
194.17
57.75
0.88
Main
20472 625
FLWY
1281.00
391.57
398.17
398.17
399.76
0.009833
12.48
194.64
56.00
0.87
Main
20472 625
100yr FU
1327.00
391.57
398.24
398.24
399.89
0.010121
12.75
198.98
58.10
0.89
Main
20287 344
100yr EX
1281.00
387.58
395.48
394.54
396.58
0.007241
9.71
201.05
107.45
0.65
Main
20287 344
FLWY
1281.00
387.58
396.49
394.54
397.34
0.004612
8.48
212.10
50.00
0.53
Main
20287 344
100yr FU
1327.00
387.58
395.65
394.54
396.62
0.006461
9.32
218.91
109.14
0.61
Main
20243 Inter
100yr EX
1281.00
388.37
395.54
394.95
396.10
0.003416
7.02
292.59
124.84
0.50
Main
20243 Inter
FLWY
1281.00
388.37
396.45
394.86
397.06
0.002810
6.99
260.04
61.02
0.47
Main
20243 Inter
100yr FU
1327.00
388.37
395.68
395.02
396.20
0.003199
6.89
309.10
126.76
0.49
Main
20208. 875
Culvert
Main
20149 Inter
100yr EX
1281.00
388.00
393.25
393.25
394.37
0.008842
9.42
224.57
111.25
0.78
Main
20149 Inter
FLWY
1281.00
388.00
393.26
393.26
394.85
0.011226
10.62
159.76
56.00
0.88
Main
20149 Inter
100yr FU
1327.00
388.00
393.31
393.31
394.45
0.008890
9.53
231.32
111.79
0.79
Main
20101 Inter
100yr EX
1281.00
388.00
392.52
392.52
393.43
0.007662
7.93
172.52
93.77
0.71
Main
20101 Inter
FLWY
1281.00
388.00
392.54
392.54
393.97
0.011689
9.84
136.96
47.00
0.88
Main
20101 Inter
100yr FU
1327.00
388.00
392.55
392.55
393.50
0.007771
8.03
175.67
94.04
0.72
Main
19708 342
100yr EX
1281.00
380.11
386.92
386.92
387.58
0.007585
8.98
280.71
148.88
0.65
Main
19708 342
FLWY
1281.00
380.11
387.41
387.41
388.54
0.009483
10.59
185.15
62.23
0.73

HEC-RAS Plan: Proposed River: RockvBranch Reach: Main (Continued)
Reach
River Sta
Profile
Q Total
Min Ch El
W.S. Elev
Crit W.S.
E.G. Elev
E.G. Slope
Vel Chnl
Flow Area
Top Width
Froude # Chl
(cfs)
(ft)
(ft)
(ft)
(ft)
(ft/ft)
(ft/s)
(sq ft)
(ft)
Main
19708 342
100yr FU
1327.00
380.11
386.95
386.95
387.62
0.007730
9.10
285.53
149.29
0.65
Main
19030 Inter
100yr EX
1281.00
374.00
381.10
381.26
0.000658
3.24
414.66
119.44
0.23
Main
19030 Inter
FLWY
1281.00
374.00
381.65
381.86
0.000813
3.46
353.62
61.80
0.23
Main
19030 Inter
100yr FU
1 1327.00
374.00
381.19
381.36
0.000653
3.25
425.42
120.84
0.23
Main
18984 341
100yr EX
1281.00
371.49
380.92
377.19
381.19
0.001217
4.50
354.77
115.96
0.29
Main
18984 341
FLWY
1281.00
371.49
381.47
377.19
381.78
0.001207
4.70
331.69
65.00
0.30
Main
18984 341
100yr FU
1327.00
371.49
381.02
377.30
381.29
0.001212
4.53
365.53
117.69
0.29
Main
18923. 876
Culvert
Main
18864 Inter
100yr EX
1281.00
362.73
369.60
367.95
370.47
0.004314
7.60
190.14
43.03
0.56
Main
18864 Inter
FLWY
1281.00
362.73
369.74
367.90
370.66
0.005830
7.72
166.03
28.60
0.56
Main
18864 Inter
100yr FU
1327.00
362.73
370.00
368.05
370.79
0.003659
7.31
207.33
44.46
0.52
Main
18821 Inter
100yr EX
1281.00
362.00
369.59
370.18
0.002872
6.30
229.50
52.36
0.46
Main
18821 Inter
FLWY
1281.00
362.00
369.68
370.32
0.003802
6.451
198.73
33.49
0.47
Main
18821 Inter
100yr FU
1327.00
362.00
369.99
370.54
0.002429
6.06
251.23
54.53
0.43
Main
18560 340
100yr EX
1281.00
360.50
368.34
369.23
0.004452
8.93
243.09
55.39
0.58
Main
18560 340
FLWY
1281.00
360.50
368.35
369.23
0.004397
8.89
243.34
54.00
0.58
Main
18560 340
100yr FU
1327.00
360.50
369.10
369.80
0.003172
8.06
286.85
59.25
0.50
Main
18270 Inter
100yr EX
1281.00
360.00
367.76
368.21
0.002218
5.47
257.79
56.60
0.41
Main
18270 Inter
FLWY
1281.00
360.00
367.78
368.23
0.002188
5.45
258.10
54.00
0.40
Main
18270 Inter
100yr FU
1327.00
360.00
368.79
369.13
0.001326
4.73
318.47
61.12
0.32
Main
18223 339
100yr EX
1281.00
358.08
367.02
365.20
367.93
0.004326
8.75
232.36
49.74
0.55
Main
18223 339
FLWY
1281.00
358.08
367.07
365.20
367.96
0.004203
8.66
234.52
49.00
0.54
Main
18223 339
100yr FU
1327.00
358.08
368.36
365.32
368.96
0.002441
7.29
303.13
55.85
0.42
Main
18141. 877
Culvert
Main
18102 Inter
100yr EX
1281.00
358.00
364.48
362.16
365.02
0.002540
6.06
239.42
55.28
0.44
Main
18102 Inter
FLWY
1281.00
358.00
364.51
362.15
365.06
0.002565
6.10
240.53
46.60
0.44
Main
18102 Inter
100yr FU
1327.00
358.00
365.26
362.24
365.70
0.001771
5.49
275.47
57.51
0.38
Main
18043 Inter
100yr EX
1446.00
358.00
362.71
362.59
364.38
0.012340
10.56
153.47
46.69
0.91
Main
18043 Inter
FLWY
1446.00
358.00
362.77
362.53
364.43
0.011947
10.49
150.79
40.00
0.90
Main
18043 Inter
100yr FU
1499.00
358.00
364.75
365.47
0.003217
7.04
257.20
54.75
0.50
Main
17929 Inter
100yr EX
1446.00
356.00
362.04
363.22
0.006673
9.18
199.41
51.57
0.70
Main
17929 Inter
FLWY
1446.00
356.00
362.02
363.28
0.007010
9.39
186.20
41.00
0.72
Main
17929 Inter
100yr FU
1499.00
356.00
364.67
365.14
0.001640
5.95
350.84
63.28
0.37
Main
17838 338
100yr EX
1446.00
352.80
360.34
360.34
362.31
0.013448
13.65
185.50
48.35
0.91
Main
17838 338
FLWY
1446.00
352.80
360.30
360.30
362.33
0.013921
13.83
178.36
42.00
0.92
Main
17838 338
100yr FU
1499.00
352.80
364.57
364.97
0.001775
6.79
425.16
65.16
0.36
Main
17579 Inter
100yr EX
1446.00
352.00
359.51
359.98
0.001823
5.69
310.73
59.16
0.38
Main
17579 Inter
FLWY
1446.00
352.00
359.61
360.11
0.001869
5.81
285.66
45.00
0.39
Main
17579 Inter
100yr FU
1499.00
352.00
364.60
364.74
0.000278
3.22
664.15
97.89
0.16
Main
17392 879
100yr EX
1446.00
347.08
359.40
359.71
0.000813
4.96
438.05
62.16
0.26
Main
17392 879
FLWY
1446.00
347.08
359.50
359.83
0.000844
5.08
403.23
45.00
0.27
Main
17392 879
100yr FU
1499.00
347.08
364.56
364.69
0.000218
3.31
848.79
139.76
0.14
Main
17366 Inter
100yr EX
1446.00
347.00
359.40
353.86
359.67
0.000757
4.20
344.43
62.56
0.25
Main
17366 Inter
FLWY
1446.00
347.00
359.51
353.86
359.78
0.000728
4.15
348.59
63.06
0.24
Main
17366 Inter
100yr FU
1499.00
347.00
364.59
353.97
364.66
0.000125
2.30
1024.67
216.48
0.11
Main
17299 880
Culvert
Main
17231 Inter
100yr EX
1446.00
342.00
352.92
349.30
353.45
0.001991
5.97
294.03
54.82
0.37
Main
17231 Inter
FLWY
1446.00
342.00
352.96
349.30
353.48
0.001950
5.93
295.29
52.00
0.37
Main
17231 Inter
100yr FU
1499.00
342.00
353.16
349.40
353.68
0.001927
5.99
306.95
56.01
0.37
Main
17157 Inter
100yr EX
1446.00
342.00
351.77
353.02
0.004644
9.39
209.93
42.09
0.59
Main
17157 Inter
FLWY
1446.00
342.00
351.86
353.07
0.004448
9.25
211.18
38.00
0.58
Main
17157 Inter
100yr FU
1499.00
342.00
352.03
353.27
0.004422
9.36
221.05
43.19
0.58
Main
16910 881
100yr EX
1446.00
340.68
351.87
352.29
0.001061
5.31
330.24
47.40
0.30
Main
16910 881
FLWY
1446.00
340.68
351.95
352.36
0.001031
5.26
331.91
44.00
0.29
Main
16910 881
100yr FU
1499.00
340.68
352.13
352.56
0.001039
5.35
342.77
48.23
0.30
Main
16252 1nter
100yr EX
2180.00
336.00
352.10
342.11
352.13
0.000028
1.14
1596.85
356.93
0.05

HEC-RAS Plan: Proposed River: RockvBranch Reach: Main (Continued)
Reach
River Sta
Profile
Q Total
Min Ch El
W.S. Elev
Crit W.S.
E.G. Elev
E.G. Slope
Vel Chnl
Flow Area
Top Width
Froude # Chl
(cfs)
(ft)
(ft)
(ft)
(ft)
(ft/ft)
(ft/s)
(sq ft)
(ft)
Main
16252 Inter
FLWY
2180.00
336.00
352.07
342.11
352.14
0.000089
2.02
1077.40
101.28
0.09
Main
16252 Inter
100yr FU
2275.00
336.00
352.36
342.25
352.40
0.000028
1.14
1646.20
362.30
0.05
Main
16169 Inter
100yr EX
2180.00
336.00
351.72
343.49
352.05
0.000554
4.92
685.33
83.98
0.23
Main
16169 Inter
FLWY
1 2180.00
336.00
351.68
343.49
352.05
0.000605
5.13
607.15
65.00
0.24
Main
16169 Inter
100yr FU
2275.00
336.00
351.97
343.66
352.31
0.000562
5.01
706.81
85.55
0.23
Main
16157. 882
Bridge
Main
16135 335
100yr EX
2180.00
333.43
351.06
351.53
0.001011
5.81
509.15
59.47
0.26
Main
16135 335
FLWY
2180.00
333.43
351.06
351.54
0.0010081
5.80
509.06
58.42
0.26
Main
16135 335
100yr FU
2275.00
333.43
351.31
351.81
0.001033
5.94
524.41
59.94
0.27
Main
16096 Inter
100yr EX
2180.00
335.00
351.07
344.87
351.45
0.001005
5.09
484.70
81.82
0.28
Main
16096 Inter
FLWY
2180.00
335.00
351.07
344.87
351.45
0.001004
5.09
484.85
53.75
0.28
Main
16096 Inter
100yr FU
2275.00
335.00
351.33
345.06
351.71
0.000971
5.09
547.30
86.31
0.27
Main
15564. 334
Culvert
Main
15461 Inter
100yr EX
2180.00
325.00
333.14
331.72
334.18
0.005353
8.31
303.87
95.07
0.62
Main
15461 Inter
FLWY
2180.00
325.00
333.14
331.72
334.18
0.005377
8.32
299.86
76.51
0.62
Main
15461 Inter
100yr FU
2275.00
325.00
333.32
331.85
334.35
0.005183
8.34
320.92
98.32
0.61
Main
15344 Inter
100yr EX
2460.00
324.67
332.70
333.58
0.003750
8.00
416.50
88.27
0.55
Main
15344 Inter
FLWY
2460.00
324.67
332.67
333.59
0.003890
8.12
400.23
75.00
0.56
Main
15344 Inter
100yr FU
2570.00
324.67
332.88
333.78
0.003715
8.10
432.29
89.59
0.55
Main
15053 333
100yr EX
2460.00
321.94
329.28
329.28
331.60
0.012828
14.45
296.43
64.74
0.99
Main
15053 333
FLWY
2460.00
321.94
329.31
329.31
331.58
0.012538
14.33
298.02
63.00
0.98
Main
15053 333
100yr FU
2570.00
321.94
329.43
329.43
331.80
0.012822
14.66
306.15
65.40
0.99
Main
14520 332
100yr EX
2460.00
319.55
326.77
327.00
0.000990
3.96
697.13
151.11
0.28
Main
14520 332
FLWY
2460.00
319.55
326.76
326.99
0.000989
3.95
695.57
149.00
0.28
Main
14520 332
100yr FU
2570.00
319.55
326.99
327.22
0.000947
3.96
730.37
153.30
0.27
Main
14100 331
100yr EX
2460.00
316.03
326.08
326.44
0.001762
6.66
780.37
148.84
0.38
Main
14100 331
FLWY
2460.00
316.03
326.081
326.44
0.001731
6.60
771.05
140.00
0.37
Main
14100 331
100yr FU
2570.00
316.03
326.33
326.69
0.001691
6.63
817.39
149.88
0.37
Main
14053 Inter
100yr EX
2460.00
316.42
325.56
322.91
326.24
0.002751
7.83
505.60
89.57
0.48
Main
14053 Inter
FLWY
2460.00
316.42
325.56
322.96
326.24
0.002729
7.79
490.69
76.50
0.48
Main
14053 Inter
100yr FU
2570.00
316.42
325.80
323.05
326.49
0.002677
7.87
527.22
91.05
0.48
Main
14001. 884
Bridge
Main
13896 Inter
100yr EX
2460.00
314.10
321.08
321.08
322.49
0.008710
11.12
383.77
141.61
0.80
Main
13896 Inter
FLWY
2460.00
314.10
321.10
321.10
323.26
0.011584
12.85
258.34
60.00
0.93
Main
13896 Inter
100yr FU
2570.00
314.10
321.17
321.17
322.61
0.008810
11.30
395.44
142.45
0.81
Main
13776 885
100yr EX
2603.00
311.08
320.80
319.12
321.21
0.001679
6.23
830.65
260.96
0.41
Main
13776 885
FLWY
2603.00
311.08
320.91
319.12
321.34
0.001650
6.24
780.26
210.00
0.41
Main
13776 885
100yr FU
2727.00
311.08
320.89
319.22
321.32
0.001720
6.36
854.97
261.71
0.41
Main
13723 886
Bridge
Main
13704 Inter
100yr EX
2603.00
312.00
319.03
319.03
320.10
0.005502
8.92
466.78
271.82
0.70
Main
13704 Inter
FLWY
2603.00
312.00
319.04
319.04
320.10
0.005427
8.88
470.25
271.00
0.69
Main
13704 Inter
100yr FU
2727.00
312.00
319.12
319.12
320.20
0.005471
9.01
493.02
273.18
0.70
Main
13634 Inter
100yr EX
2603.00
310.00
317.38
317.38
318.38
0.005465
9.22
513.48
264.37
0.70
Main
13634 Inter
FLWY
2603.00
310.00
317.42
317.42
318.38
0.005288
9.11
517.46
256.00
0.69
Main
13634 Inter
100yr FU
2727.00
310.00
317.46
317.46
318.47
0.005535
9.37
533.06
264.86
0.71
Main
12719 Inter
100yr EX
2603.00
302.50
314.88
314.97
0.000315
2.93
1180.79
324.33
0.16
Main
12719 Inter
FLWY
2603.00
302.50
315.86
316.00
0.000306
3.08
893.70
144.00
0.16
Main
12719 Inter
100yr FU
2727.00
302.50
314.99
315.08
0.000320
2.98
1215.29
328.45
0.17
Main
12678 328
100yr EX
2603.00
300.21
314.80
308.09
314.94
0.000349
3.20
945.37
293.06
0.17
Main
12678 328
FLWY
2603.00
300.21
315.65
308.09
315.94
0.000582
4.34
674.13
80.00
0.22
Main
12678 328
100yr FU
2727.00
300.21
314.90
308.30
315.05
0.000355
3.24
975.88
301.37
0.17
Main
12658. 887
Culvert
Main
12623 888
100yr EX
2603.00
298.58
311.91
306.19
312.38
0.001318
5.59
548.03
120.67
0.32
Main
12623 888
FLWY
2603.00
298.58
312.06
306.22
312.52
0.001249
5.50
530.47
80.00
0.31
Main
12623 888
100yr FU
2727.00
298.58
312.04
306.40
312.53
0.001367
5.75
564.31
125.20
0.32

HEC-RAS Plan: Proposed River: RockvBranch Reach: Main (Continued)
Reach
River Sta
Profile
Q Total
Min Ch El
W.S. Elev
Crit W.S.
E.G. Elev
E.G. Slope
Vel Chnl
Flow Area
Top Width
Froude # Chl
(cfs)
(ft)
(ft)
(ft)
(ft)
(ft/ft)
(ft/s)
(sq ft)
(ft)
Main
12602. 889
Culvert
Main
12489 87
100yr EX
2603.00
296.00
309.46
309.46
310.64
0.003529
10.32
458.34
151.65
0.53
Main
12489 87
FLWY
2603.00
296.00
309.46
309.46
310.63
0.003507
10.29
457.57
145.00
0.53
Main
12489 87
100yr FU
1 2727.00
296.00
309.56
309.56
310.75
0.003576
10.45
474.20
154.10
0.54
Main
12326 890
100yr EX
2603.00
290.55
306.83
299.63
307.17
0.000708
5.63
797.27
153.12
0.26
Main
12326 890
FLWY
2603.00
290.55
307.46
299.63
307.78
0.000617
5.40
773.89
103.00
0.24
Main
12326 890
100yr FU
2727.00
290.55
307.01
299.84
307.35
0.000710
5.68
825.28
155.47
0.26
Main
12185 891
Culvert
Main
12079 Inter
100yr EX
2603.00
290.00
298.52
295.75
299.46
0.003118
7.88
375.25
67.44
0.50
Main
12079 Inter
FLWY
2603.00
290.00
298.64
295.74
299.58
0.003012
7.83
361.25
55.00
0.49
Main
12079 Inter
100yr FU
2727.00
290.00
299.20
295.90
300.05
0.002548
7.54
422.47
71.54
0.46
Main
12018 Inter
100yr EX
2603.00
290.00
298.48
299.18
0.002231
6.74
421.89
68.40
0.41
Main
12018 Inter
FLWY
2603.00
290.00
298.60
299.31
0.002194
6.741
390.15
47.00
0.41
Main
12018 Inter
100yr FU
2727.00
290.00
299.17
299.81
0.001853
6.48
471.30
74.36
0.38
Main
11569 326
100yr EX
2780.00
283.34
296.91
297.51
0.006671
6.24
445.19
58.71
0.40
Main
11569 326
FLWY
2780.00
283.34
296.95
297.74
0.006076
7.10
391.45
38.20
0.39
Main
11569 326
100yr FU
3160.00
283.34
297.69
298.33
0.006480
6.42
492.95
63.41
0.40
Main
11033 325
100yr EX
2780.00
279.76
291.67
292.68
0.012583
8.09
343.77
45.49
0.52
Main
11033 325
FLWY
2780.00
279.76
291.72
293.05
0.013218
9.28
299.65
29.00
0.51
Main
11033 325
100yr FU
3160.00
279.76
292.41
293.49
0.013141
8.35
378.52
47.76
0.52
Main
10503 324
100yr EX
2780.00
275.32
289.82
290.14
0.002221
4.56
609.77
60.91
0.25
Main
10503 324
FLWY
2780.001
275.32
290.17
290.53
0.002042
4.801
579.70
46.00
0.24
Main
10503 324
100yr FU
3160.00
275.32
290.25
290.64
0.002612
4.96
636.52
61.98
0.27
Main
10080 Inter
100yr EX
2780.00
276.00
289.55
281.87
289.76
0.000425
3.69
908.99
131.56
0.20
Main
10080 Inter
FLWY
2780.00
276.00
289.97
281.87
290.16
0.000386
3.60
860.54
87.00
0.19
Main
10080 Inter
100yr FU
3160.00
276.00
289.95
282.33
290.19
0.000483
4.03
962.52
136.73
0.21
Main
9962 323
100yr EX
2780.00
271.66
289.52
278.81
289.66
0.000680
3.05
1004.71
160.03
0.16
Main
9962 323
FLWY
2780.00
271.66
289.94
278.80
290.08
0.000619
2.97
978.14
99.00
0.15
Main
9962 323
100yr FU
3160.00
271.66
289.92
279.31
290.08
0.000783
3.31
1070.42
171.25
0.17
Main
9911 892
Culvert
Main
9727 85
100yr EX
2780.00
270.00
286.22
279.00
286.37
0.000232
2.62
1241.70
310.62
0.12
Main
9727 85
FLWY
2780.00
270.00
286.78
279.00
287.05
0.000315
3.13
823.75
78.21
0.14
Main
9727 85
100yr FU
3160.00
270.00
286.68
279.32
286.85
0.000254
2.79
1314.17
325.57
0.12
Main
9612 893
100yr EX
3084.00
267.86
286.19
278.04
286.31
0.000458
3.89
1514.90
506.24
0.16
Main
9612 893
FLWY
3084.00
267.86
286.67
278.04
286.98
0.000813
5.28
792.82
105.00
0.22
Main
9612 893
100yr FU
3625.00
267.86
286.661
279.01
286.78
0.000473
4.02
1681.98
511.93
0.17
Main
9566 322
Culvert
Main
9085 Inter
100yr EX
3084.00
266.00
273.37
272.11
274.43
0.005134
8.61
470.35
165.76
0.62
Main
9085 Inter
FLWY
3084.00
266.00
274.33
272.11
275.11
0.003070
7.36
528.40
95.00
0.49
Main
9085 Inter
100yr FU
3625.00
266.00
274.04
272.65
275.15
0.004758
8.90
554.34
199.64
0.61
Main
8986 Inter
100yr EX
3209.00
264.00
272.96
271.88
273.90
0.004552
9.18
567.82
217.31
0.60
Main
8986 Inter
FLWY
3209.00
264.00
273.73
271.78
274.71
0.003789
8.96
494.22
80.00
0.56
Main
8986 Inter
100yr FU
3793.00
264.00
273.71
272.41
274.63
0.004027
9.22
686.89
250.13
0.57
Main
8848 Inter
100yr EX
3209.00
261.00
272.08
270.56
272.82
0.003521
7.93
593.27
223.98
0.49
Main
18848 Inter
FLWY
3209.001
261.00
272.90
270.41
273.78
0.0033091
8.20
497.641
75.00
0.48
Main
8848 Inter
100yr FU
3793.00
261.00
272.981
271.00
273.67
0.003026
7.89
716.83
246.76
0.46
Main
8729 321
100yr EX
3209.00
261.37
271.59
269.68
272.42
0.002996
8.35
569.55
210.39
0.50
Main
8729 321
FLWY
3209.00
261.37
271.65
269.49
273.24
0.004653
10.45
351.43
45.00
0.62
Main
8729 321
100yr FU
3793.00
261.37
272.46
270.20
273.31
0.002780
8.57
670.15
250.01
0.49
Main
8638 Inter
100yr EX
3209.00
258.40
270.09
266.84
271.19
0.002934
8.71
455.13
142.17
0.49
Main
8638 Inter
FLWY
3209.00
258.40
270.46
266.73
271.67
0.002896
8.88
383.41
40.00
0.49
Main
8638 Inter
100yr FU
3793.00
258.40
270.79
267.63
272.07
0.003133
9.43
510.77
170.63
0.52
Main
8327 320
100yr EX
3209.00
257.33
269.81
265.64
270.38
0.001540
6.65
740.52
279.63
0.37
Main
8327 320
FLWY
3209.00
257.33
270.06
265.64
270.84
0.001806
7.31
497.65
58.70
0.40
Main
8327 320
100yr FU
3793.00
257.33
270.69
266.36
271.22
0.001372
6.63
919.77
281.19
0.35
Main
8052 319
100yr EX
3209.00
255.29
269.681
263.16
269.97
0.000678
4.46
813.11
161.03
0.24

HEC-RAS Plan: Proposed River: RockvBranch Reach: Main (Continued)
Reach
River Sta
Profile
Q Total
Min Ch El
W.S. Elev
Crit W.S.
E.G. Elev
E.G. Slope
Vel Chnl
Flow Area
Top Width
Froude # Chl
(cfs)
(ft)
(ft)
(ft)
(ft)
(ft/ft)
(ft/s)
(sq ft)
(ft)
Main
8052 319
FLWY
3209.00
255.29
269.98
263.16
270.32
0.000728
4.70
712.62
72.13
0.25
Main
8052 319
100yr FU
3793.00
255.29
270.58
263.78
270.85
0.000612
4.47
995.44
245.36
0.23
Main
7933 895
Culvert
Main
7864 Inter
100yr EX
3209.00
255.00
264.26
265.45
0.005119
8.75
366.86
57.60
0.61
Main
7864 Inter
FLWY
3209.00
255.00
264.28
265.47
0.005071
8.73
367.91
57.60
0.60
Main
7864 Inter
100yr FU
3793.00
255.00
264.66
266.14
0.005857
9.74
390.22
59.21
0.65
Main
7407 318
100yr EX
3209.00
250.94
260.31
260.31
262.36
0.007719
12.28
410.25
137.65
0.78
Main
17407 318
FLWY
3209.00
250.94
261.00
262.79
0.0059241
11.39
377.97
65.00
0.69
Main
7407 318
100yr FU
3793.00
250.94
261.04
261.04
263.04
0.007098
12.50
517.01
155.44
0.75
Main
6964 317
100yr EX
3209.00
247.94
258.99
259.25
0.001323
5.59
945.32
230.86
0.32
Main
6964 317
FLWY
3209.00
247.94
259.45
260.49
0.003767
9.74
540.80
90.00
0.54
Main
6964 317
100yr FU
3793.00
247.94
259.67
259.93
0.001177
5.52
1105.96
237.11
0.30
Main
6530 Inter
100yr EX
3209.00
247.41
255.27
255.27
257.75
0.011302
12.83
287.74
79.70
0.92
Main
6530 Inter
FLWY
3209.00
247.41
255.30
255.30
257.74
0.011045
12.73
287.33
71.00
0.91
Main
6530 Inter
100yr FU
3793.00
247.41
256.13
256.13
258.59
0.009611
12.93
364.16
96.22
0.87
Main
6377 316
100yr EX
3513.00
242.93
254.83
251.16
255.73
0.004093
7.66
471.47
63.91
0.46
Main
6377 316
FLWY
3513.00
242.93
254.87
251.17
255.77
0.004040
7.63
469.65
58.00
0.46
Main
6377 316
100yr FU
4109.00
242.93
256.06
251.84
256.99
0.003563
7.80
553.97
74.92
0.44
Main
6299 896
Culvert
Main
6218 Inter
100yr EX
3513.00
242.00
251.81
248.00
252.46
0.002194
6.54
566.49
120.90
0.41
Main
6218 Inter
FLWY
3513.00
242.00
251.96
248.01
252.65
0.002231
6.67
541.64
76.16
0.41
Main
6218 Inter
100yr FU
4109.00
242.00
253.29
248.64
253.76
0.001332
5.70
755.96
132.77
0.33
Main
5869 315
100yr EX
3352.00
238.16
251.73
251.89
0.000496
4.09
1700.34
333.59
0.21
Main
5869 315
FLWY
3352.00
238.16
251.76
252.03
0.000699
4.87
1118.34
143.58
0.25
Main
5869 315
100yr FU
3825.00
238.16
253.26
253.37
0.000322
3.58
2349.48
468.23
0.17
Main
5613 Inter
100yr EX
3352.00
240.00
251.71
251.77
0.000249
2.88
2518.74
421.21
0.15
Main
5613 Inter
FLWY
3352.00
240.00
251.72
251.86
0.000430
3.78
1535.91
186.19
0.20
Main
5613 Inter
100yr FU
3825.00
240.00
253.25
253.29
0.000170
2.59
3195.29
466.33
0.13
Main
5346 314
100yr EX
3352.00
238.69
251.31
247.37
251.60
0.000853
5.35
1162.78
656.13
0.27
Main
5346 314
FLWY
3352.00
238.69
251.35
247.37
251.65
0.000877
5.44
1170.07
170.76
0.28
Main
5346 314
100yr FU
3825.00
238.69
252.94
247.75
253.16
0.000607
4.92
1440.39
668.52
0.24
Main
5158 397
Culvert
Main
5008 313
100yr EX
3352.00
235.08
246.75
244.26
247.31
0.002017
6.47
623.41
527.47
0.40
Main
5008 313
FLWY
3352.00
235.08
246.81
244.24
247.37
0.001938
6.38
620.56
179.26
0.39
Main
5008 313
100yr FU
3825.00
235.08
247.11
244.99
247.67
0.001928
6.51
700.28
549.08
0.39
Main
5000 898
Bridge
Main
4974 Inter
100yr EX
3352.00
235.08
243.66
242.67
244.48
0.004116
7.96
679.39
322.93
0.56
Main
4974 Inter
FLWY
3352.00
235.08
244.61
242.80
245.17
0.002095
6.24
798.31
194.49
0.41
Main
4974 Inter
100yr FU
3825.00
235.08
244.17
243.18
244.89
0.003381
7.61
822.74
367.43
0.52
Main
4472 312
100yr EX
3368.00
233.90
243.67
243.72
0.000302
2.51
2884.48
637.24
0.16
Main
4472 312
FLWY
3368.00
233.90
244.08
244.30
0.000981
4.67
1382.66
220.00
0.28
Main
4472 312
100yr FU
3846.00
233.90
244.16
244.21
0.000289
2.55
3202.56
661.97
0.15
Main
3983 Inter
100yr EX
3368.00
231.50
242.03
243.23
0.003955
9.45
518.99
145.12
0.57
Main
3983 Inter
FLWY
3368.00
231.50
242.22
243.37
0.003663
9.23
514.02
105.00
0.55
Main
3983 Inter
100yr FU
3846.00
231.50
242.49
243.73
0.003953
9.78
586.86
149.39
0.58
Main
3851 311
100yr EX
3532.00
230.79
241.44
239.81
242.61
0.005292
8.78
470.24
170.89
0.61
Main
3851 311
FLWY
3532.00
230.79
241.75
239.81
242.77
0.004399
8.26
508.78
140.00
0.56
Main
3851 311
100yr FU
4046.00
230.79
241.58
240.31
243.02
0.006363
9.77
494.45
178.27
0.68
Main
3810 899
Culvert
Main
3760 Inter
100yr EX
3532.00
230.00
239.68
239.68
241.06
0.006496
10.29
472.52
202.57
0.65
Main
3760 Inter
FLWY
3532.00
230.00
239.69
239.69
241.06
0.006423
10.24
474.11
192.44
0.64
Main
3760 Inter
100yr FU
4046.00
230.00
240.01
239.94
241.46
0.006741
10.77
544.34
359.44
0.66
Main
3594 900
100yr EX
3617.00
230.02
237.87
237.87
239.45
0.008492
11.08
512.99
188.42
0.79
Main
3594 900
FLWY
3617.00
230.02
238.25
237.86
239.49
0.006365
9.99
573.32
174.25
0.69
Main
3594 900
100yr FU
4152.00
230.02
239.85
238.50
240.36
0.002388
7.09
1061.09
319.03
0.44

HEC-RAS Plan: Proposed River: RockvBranch Reach: Main (Continued)
Reach
River Sta
Profile
Q Total
Min Ch El
W.S. Elev
Crit W.S.
E.G. Elev
E.G. Slope
Vel Chnl
Flow Area
Top Width
Froude # Chl
(cfs)
(ft)
(ft)
(ft)
(ft)
(ft/ft)
(ft/s)
(sq ft)
(ft)
Main
3590 901
Bridge
Main
3565 Inter
100yr EX
3617.00
230.00
237.17
237.90
0.004027
8.38
790.06
260.35
0.57
Main
3565 Inter
FLWY
3617.00
230.00
238.15
238.79
0.002826
7.68
801.73
147.31
0.49
Main
3565 Inter
100yr FU
1 4152.00
230.00
237.43
238.23
0.004294
8.87
860.94
272.43
0.59
Main
3291 310
100yr EX
3617.00
227.26
236.40
236.95
0.002474
7.20
843.25
341.60
0.44
Main
3291 310
FLWY
3617.00
227.26
236.94
237.87
0.003242
8.60
716.43
180.39
0.51
Main
3291 310
100yr FU
4152.00
227.26
236.59
237.20
0.002722
7.67
910.73
343.07
0.47
Main
2881 309
100yr EX
3617.00
226.54
235.59
234.82
235.91
0.002028
5.77
1014.27
367.69
0.38
Main
2881 309
FLWY
3617.00
226.54
235.83
234.59
236.40
0.003054
7.23
873.64
215.88
0.47
Main
2881 309
100yr FU
4152.00
226.54
235.49
235.00
235.96
0.002987
6.94
976.98
363.01
0.46
Main
2868 902
Bridge
Main
2835 Inter
100yr EX
3617.00
226.00
234.80
233.88
235.52
0.003894
8.06
964.98
429.49
0.53
Main
2835 Inter
FLWY
3617.00
226.00
235.78
233.85
236.33
0.002480
7.00
992.20
214.71
0.43
Main
2835 Inter
100yr FU
4152.00
226.00
235.23
234.54
235.90
0.003584
8.03
1151.87
440.06
0.51
Main
2258 308
100yr EX
3193.00
222.91
234.42
234.48
0.000544
3.16
2177.70
634.84
0.19
Main
2258 308
FLWY
3193.00
222.91
235.03
235.21
0.001079
4.66
1369.98
254.62
0.27
Main
2258 308
100yr FU
3497.00
222.91
234.96
235.01
0.000408
2.85
2524.59
651.17
0.17
Main
1788 307
100yr EX
3193.00
224.33
234.25
234.29
0.000301
2.50
3295.12
656.08
0.15
Main
1788 307
FLWY
3193.00
224.33
234.65
234.78
0.000754
4.08
1688.08
257.88
0.24
Main
1788 307
100yr FU
3497.00
224.33
234.82
234.85
0.000258
2.42
3674.30
678.11
0.14
Main
1366 306
100yr EX
3193.00
224.00
234.17
234.19
0.000166
2.04
4004.34
707.08
0.12
Main
1366 306
FLWY
3193.00
224.00
234.34
234.47
0.000687
4.20
1666.07
225.00
0.24
Main
1366 306
100yr FU
3497.00
224.00
234.75
234.77
0.000148
2.00
4417.60
722.00
0.11
Main
876 305
100yr EX
3193.00
221.20
233.31
229.38
233.84
0.001701
6.53
722.00
177.83
0.36
Main
876 305
FLWY
3193.00
221.20
233.31
229.38
233.84
0.001701
6.53
721.96
93.89
0.36
Main
876 305
100yr FU
3497.00
221.20
233.88
229.68
234.43
0.001656
6.68
775.34
192.30
0.36
Main
779 903
Culvert
Main
666 Inter
100yr EX
3193.00
221.20
229.49
229.39
231.59
0.008615
12.18
363.35
146.12
0.86
Main
666 Inter
FLWY
3193.00
221.20
229.49
229.41
231.70
0.008916
12.40
348.06
88.86
0.88
Main
666 Inter
100yr FU
3497.00
221.20
229.68
229.68
231.99
0.009217
12.85
380.81
147.54
0.90
Main
370 304
100yr EX
3206.00
216.65
225.30
225.25
228.31
0.012014
14.06
261.90
75.00
0.93
Main
370 304
FLWY
3206.00
216.65
225.33
225.08
228.39
0.012009
14.10
240.43
38.00
0.93
Main
370 304
100yr FU
3512.00
216.65
226.87
226.87
228.59
0.005842
11.21
594.73
280.49
0.67

Appendix E
Sealed Construction Plans
Sealed Survey Plans

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Appendix F
Email Correspondence

Jacob Wines
From: Smalls, Dominick <[e-mail]>
Sent: Monday, July 10, 2023 11:31 AM
To: Becky Ward; David Duncan; Alston Willard
Subject: RE: Royal Street Concerns
Becky,
Ben stated that for elevation drops, you all can submit a Letter of Map Revision to FEMA after the project is built. If
you show a rise, then that would necessitate a review by FEMA before construction.
He also said if the study only shows decreases, then he would say go that way and submit the Letter of Map Revision
once it is built. Let me know if you need anything else.
Thanks,
Dominick
From: Becky Ward <[e-mail]>
Sent: Thursday, June 22, 2023, 8:16 AM
To: Smalls, Dominick<[e-mail]>; David Duncan <[e-mail]>; Alston
Willard <[e-mail]>
Subject: RE: Royal Street Concerns
CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you verify that
the attachment and content are safe. If you believe this email is suspicious, please click the Thish Alert' link in the banner to
report this message.
Dominick:
The meeting that we would like to have with Ben would be to discuss the drop that we have with the design
currently to see if it would be acceptable to submit a no rise report and then follow up with a LOMR to revise the
Base Flood Elevations. The drop that we have is from -1.0 up to -1.92 feet . If we can get an ok to submit the no rise
than we will proceed with completing that report. If we are not permitted to submit a no -rise with drops in the water
surface within this range there will be only two other options.
1. We go with the design that we have and submit a CLOMR
2. We revise the design to lessen the drop. We would prefer not to do this as lowering the water surface as
much as possible with homes currently in the floodplain is the better option.
Let us know if you need anything else.
Thanks,
Becky L. Ward, PE (NC,SC,VA)
Senior Engineer
TIMMONS GROUP I www.timmons.com
5410 Trinity Rd., Suite 102 1 Raleigh, NC 27607
Office: 984-255-2354 1 Cell: 919-812-7298 1 Fax: [phone]
Becky.Warda.timmons.com
Your Vision Achieved Through Ours.
To send me files greater than 20MB click here.
From: Smalls, Dominick <[e-mail]>
Sent: Wednesday, June 21, 2023 4:46 PM
To: Becky Ward <[e-mail]>; David Duncan <[e-mail]>
Subject: Royal Street Concerns

CAI ffinni• 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.
Becky and David,
I wanted to setup a meeting with Ben Brown, however I wanted to make sure I'm conveying the upcoming changes
needed to move forward. Could you provide me a quick summary of the sequence you need to happen to move
forward? My notes stated that we want the option of moving forward with the project and building it then complete
a LOMR after the fact. I want to talk to Ben separately to get his opinion and feedback as soon as possible.
Thanks,
Dominick
From: Becky Ward <[e-mail]>
Sent: Wednesday, May 24, 2023 10:25 AM
To: Rail, Todd <[e-mail]>; Smalls, Dominick <[e-mail]>
Cc: David Duncan <[e-mail]>; Alston Willard <[e-mail]>
Subject: Discuss contract management transfer to David and Task Order competition
CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you verify that
the attachment and content are safe. If you believe this email is suspicious, please click the Thish Alert' link in the banner to
report this message.
Todd and Dominick:
I hope you are doing well today. I wanted to ask if you would like to meet with our project team over the next couple
of weeks to discuss the Timmons contract management and final stormwater projects transfer upon my retirement?
We have the following availability to meet with you at your office. Let me know a good day and time for you and I
will send you a calendar invite.
Tuesday June 6t" 9:00am-12:00pm
Wednesday June 7t" 2:00-5:00pm
Tuesday June 20t" any time
Wednesday June 21 2:00-5:00pm
Let me know if we need to look at any additional days and times.
Thanks,
Becky L. Ward, PE (NC,SC,VA)
Senior Engineer
TIMMONS GROUP I www.timmons.com
5410 Trinity Rd., Suite 102 1 Raleigh, NC 27607
Office: 984-255-2354 1 Cell: 919-812-7298 1 Fax: [phone]
Becky.Ward(c)timmons.com
Your Vision Achieved Through Ours.
To send me files greater than 20MB click here.