20201842 Ver 2_More Info Received_20220308

Cleveland Bluff s
Stream Restoration Plan
Requested By:
KG Plaza, LLC
Mr. Jack Carlisle & Mr. Fields Carlisle
8620 River Road
Wilmington, NC 28412
Prepared By:
Southern Environmental Group, Inc.
5315 South College Road, Suite E
Wilmington, NC 28412
910.452.2711
Date:
December 23, 2020 — V2

Cleveland Bluffs Stream Restoration Plan
srGi
I. Introduction
KG Plaza LLC seeks to restore 456 linear feet of an unnamed tributary to Middle Creek in the Neuse
River Watershed, in Johnston County, North Carolina. The unnamed tributary (UT 1) was piped as part
of ongoing development activities. This Restoration Plan has been composed to address the North
Carolina Division of Water Resources (NCDWR) concerns outlined in their Notice of Violation dated
June 24, 2019. This document will summarize the history of UT 1, pre- and post -disturbance site
conditions, and the proposed Restoration Plan.
II. Location
The site is located within the Cleveland Bluffs subdivision, located south of the intersection of
Cornwallis Road and Cleveland Road, near Garner, NC (see Attachment 1 — Vicinity Map). UT 1 is
located along the west side of the clubhouse and north of an existing pond. It is in the Neuse River
Basin, and the Upper Neuse subbasin. The 8-digit HUC is 03020201. This site is not located within a
Neuse River Basin Targeted Local Watershed. The USGS Edmondson quad was utilized for this
document (see Attachment 2 — USGS Topo Map).
III. Watershed Data
The general watershed area of Middle Creek is comprised of single-family subdivisions and agricultural
land. According to the USGS tool StreamStats, UT 1 has a drainage area of 20 acres (0.0313 sq. mi.)
(see Attachment 3 — Drainage Area Map). The watershed consists of a portion of the Cleveland
Elementary School, Cornwallis Road, some wooded areas, rural pasture, and meadow.
IV. Existing Site Conditions
A. Pre -development Conditions
Historically, the entire area of the subdivision was agricultural land. UT 1 was likely channelized
to maintain good farm drainage pre-1950. Cleveland Elementary, constructed in approximately
2004, lies to the northeast of UT 1. It appears that most of the stormwater generated from
impervious surfaces on this property is collected via stormwater inlets and piped directly into the
channelized feature upstream of UT 1. Most recently, UT 1 was part of a residential parcel, that
contained a single mobile home. There was a cultivated field along the west side of UT 1 up until
2015, and a smaller cultivated field on the east side of UT 1, north of the mobile home until 2015.
A soil road provided access from Cornwallis Road, which had a culverted crossing over the
unnamed tributary. There was also a culverted crossing downstream, at the point that UT 1 enters
the existing pond. UT 1 was a relatively straight channel, with, at best, intermittent flow, based on
in -person observations. The feature did not have any benching or steep banks and was regularly
mowed by the landowner. The lower third of this channel had been possibly excavated and
impounded sometime after 2006, based on Google Earth imagery (see Attachment 4 — 2014 Google
Earth Aerial). On April 24, 2015, Johnston County made a sitewide Neuse River Buffer
Determination. UT 1 (Feature B on Buffer Call) was determined to be "not subject" to the Johnson
County Neuse River Buffer Ordinance. (see Attachment 5 — Neuse River Buffer Call).
No N.C. Stream Assessment Method (NCSAM) forms were completed before UT 1 was piped.
However, based on available historical aerial imagery, extensive experience, and observations of
similar drain -ways, it is likely that UT 1 would score as a low -quality stream in both ratings classes
(USACE and NCDWR). Based on these ratings, UT 1 seemed to only serve as a low functioning
conduit for upstream stormwater to quickly move through the channel and enter the existing pond.
2

Cleveland Bluffs Stream Restoration Plan
srGi
This rapid movement through the system would have provided little uplift or value to downstream
water quality.
B. Current Conditions
The upstream off -site reach of UT 1 could be classified as a channelized headwater stream. The
culvert at the upstream end of UT 1 was moved as part of installation of an asphalt pedestrian
walking trail to serve the subdivisions residents. UT 1 was then piped down to an existing pond.
The site was then graded and stabilized with grasses and is mowed and maintained as green space.
C. Soils
According to the Soil Survey of Johnston County, UT 1 is mapped as Cowarts loamy sand, 2 to 6
percent slopes. This well drained soil was formed on ridges on marine terraces and is comprised of
loamy and sandy marine deposits.
D. Existing Plant Communities
The site is currently regularly mowed and maintained as green space for the subdivision.
E. Threatened and Endangered Species
According to N.C. Natural Heritage Program, there are no element occurrences within UT 1.
V. Restoration Plan
To restore UT 1 to stream configuration, the existing pipe will be removed, and the channel restored in
its original footprint ( see Attachment 6 —Post-Development Impacts to Stream and Wetlands and
Proposed Mitigation, Restoration of Channel). The lower third of UT 1 was a pond pre -impact but will
be restored to a continuous channel down to the culvert under the amenities access road which flows to
the exiting pond resulting in approximately 456' of stream channel. The culvert at the upper and lower
ends of the restoration area will be buried 20%.
The basic stream design includes a 2' channel bottom, slightly larger than the average width of the
original bottom which will reduce the velocity and allow longer water retention within the stream bed.
The channel bottom will be on a 1.41% grade or slope, similar to the original channel. The base channel
banks are designed to be on a 2:1 slope. A 3' wide bank -full -bench is designed on either side of the
base channel. This has a 3:1 slope extending to the top -of -bank.
The stream banks will be lined with coir matting anchored in place and overseeded. Based on velocity
calculations, seeding the coir matted banks with Class C or D vegetation will meet 2-year and 10-year
events. The site will be stabilized with the appropriate wetland seed mix and a variety of non -wetland
seed and live stakes higher on the banks and adjacent to the channel. Additionally, the headwater of
this tributary is comprised of mature tree and shrub species, which will also provide a seed source for
volunteer site appropriate species over time. Irrigation of the restoration planting will be done as
necessary. Please see Attachment 6 for stream design drawings and Channel Analysis Worksheet.
The construction sequence would include removal of the pipe and stabilizing the channel in one event.
During this time, sediment and erosion control measures will be utilized to prevent sediment discharge
into downstream waters. While we would hope this can be accomplished in 2 weeks, it will be weather
dependent and may take longer in adverse conditions. All soil removed during this process will be
placed in the spoil area shown on Sheet 6.1.
3

Cleveland Bluffs Stream Restoration Plan
srGi
To start the restoration, process the restoration plan does require the approval of NC DWR and the
USACE. This restoration plan is included in the current Nationwide Permit request. Once we have
received approval to begin the restoration process, work will begin as soon as possibly but with some
consideration of the growing season and germination requirements of the approved seed mix. We would
propose an approximate start date of May 15th and approximate completion by June 30th. We do realize
that we have 120 days from the approval date to complete the restoration process and will adjust our
timeline accordingly to meet the agreed upon deadline.
VI. Monitoring Plan
The monitoring plan for the site will follow the guidance outlined in the U.S. Army Corps of Engineers
— Wilmington District Public Notice: Notification of Issuance of Guidance for Compensatory Stream
and Wetland Mitigation Conducted for Wilmington District (October 24, 2016). Monitoring data
collected on the site will include photos, plant survival analyses, and channel stability analyses.
Monitoring will take place quarterly for the first year and then annually for a total of 5 years, unless the
NCDWR and USACE agrees the site has met the success criteria and monitoring can be stopped. Early
completion of monitoring will only be provided through written approval from the NCDWR and
USACE. Annual monitoring reports will be submitted to these agencies no later than November 30 of
each monitoring year.
A. Stream Monitoring
Stream monitoring and reports will include monitoring of the vegetative, hydrologic, and
geomorphic functions of the restored channel. This will include two cross sections (1 riffle, 1 pool).
Channel stability will be assessed yearly, to track performance of the restoration work. Visual
inspection to assess hydrologic regime will be conducted at each monitoring event, to include
assessment of channel establishment and migration, overbank events, and ordinary high-water
indicators. Vegetation will be monitored for health and vigor, to include documentation of the need
for additional plantings as necessary to maintain channel stability. Visual monitoring will be
conducted by traversing the entire mitigation site to identify and document areas of poor plant
vigor, areas dominated by undesirable volunteer species, prolonged inundation, native and exotic
invasive species, or other areas of concern. Additionally, two quadrats will be utilized to track
species, coverage, stem density and vigor.
B. Success Criteria
Succuss criteria for UT 1 will be accomplished after the following parameters are met.
1. Bank stabilization — 90% of the stream bank is observed to be stable, with no signs of ongoing
erosion (bank filling or head cutting).
2. Vegetation — 90% of the planted stems survive with 90% vegetative cover of the restored area.
3. All required repairs for site stabilization and success are made expeditiously.
VII. Pond Berm Removal
A portion of the berm and a culvert located along the eastern side of the pond will be removed.
This will involve the removal of 2-3 trees planted within the berm, the existing culvert, and
berm material. All items will be removed, placed in uplands and stabilized. Please see
Attachment 7.
4

Cleveland Bluffs Stream Restoration Plan
5r Gi
Attachment 1
Location Map
5

lack
4
N 0
"wal Rd
Sumter Dr
Qa
or
co
rn
Stream Restoration Project Area
HUC - Middle Creek
b
er
�ach�tl keri Dr 3
Midge Dr o
a
to
fir
U
0302020109
0011Fd
'i
,Cfc
row
420
almoralc‘
4.
p� �s
Q•
4754
6
S�h�7
e
rr
Pa Puodant8
vI
3
n
0 0.1250.25 0.5 0.75 1 Vicinity Map
Miles Cleveland Bluffs Stream Restoration
1 inch = 1 miles
Clayton, Johnston Co., N.C.
Map Source: ESRI Street Maps 12/18/2020 019-115.01

Cleveland Bluffs Stream Restoration Plan
5r Gi
Attachment 2
USGS Topo Map
6

0 200 400
800 1,200 1,600
Feet
1 inch = 800 feet
Map Source: USGS TopoView Service,
2016 Edmondson panel, 7.5' quad, 1:24k scale
USGS Topo Map
Cleveland Bluffs Stream Restoration
Clayton, Johnston Co., N.C.
12/18/2020 019-115.01
4M OE

Cleveland Bluffs Stream Restoration Plan
5r Gi
Attachment 3
Drainage Area Map
7

•
.1 • "
I 4.4
47.4.
Stream Restoration Project Area
StreamStats Watershed Area
i-i HI Ir. - Mir1r1IP Crank
0 0.0150.03 0.06 0.09 0.12
Miles
1 inch = 0 miles
Map Source: 2019 NCOneMaps Orthoimagery,
USGS StreamStats Service
Drainage Area Map
Cleveland Bluffs Stream Restoration
Garner, Johnston Co., N.C.
12/18/2020 019-115.01

Cleveland Bluffs Stream Restoration Plan
5r Gi
Attachment 4
2014 Google Earth Aerial
8

rrr rrvrrr. f wr
0 25 50 100 150 200
Feet
1 inch = 100 feet
Map Source: 2014 Google Eath
Aerial Photgraph - 2014
Cleveland Bluffs Stream Restoration
Garner, Johnston Co., N.C.
12/18/2020 019-115.01

Cleveland Bluffs Stream Restoration Plan
5r Gi
Attachment 5
Neuse River Buffer Ca11
9

DEPARTMENT OF PUBLIC UTILITIES
POST OFFICE BOX 2263
SMITHFIELD, N.C. 27577
[phone]
May 19, 2015
Donnie Adams, PE
DC Adams Engineering, Inc.
335 Athletic Club Blvd.
Clayton, NC 27527
Subject: Neuse River Buffer Call
NBR# NB 15-005
Project Name: Cleveland Bluffs PUD (NC PIN# 163600-54-5620)
Location / Directions: Cornwallis Road, Garner, NC, approximately 0.30 miles south of the intersection
of Cornwallis Rd and Cleveland Rd. Parcel is located on east side of Cornwallis Rd.
Subject Stream: UT to Middle Creek (C,NSW)
Determination Date: April, 24, 2015 Staff: Carlos Bagley, PE
Feature
A
Al
Stream
Type
(E/I/P)*
Pond
I
Not
Subject
Subject
Pond not
subject
Below Pond
Soil
Survey
USGS
Topo
L
Latitude
(Dec.
Degrees)
Longitude
(Dec.
Degrees)
B
n
T
P
Pond
n
z
Pond
n
P
L
Pond
n
= Ephemeral / Intermittent/ Perenn .al
Printed on recycled paper j..)

Explanation: The feature(s) listed above that are checked "Subject" to the Johnston County Neuse
Riparian Buffer Ordinance (Section 14-393 Johnston County Code of Ordinances) has or have been
approximately shown on either the Soil Survey of Johnston County, North Carolina (1994) or the most
recent version of the 1:24,000 (7.5 minute) quadrangle topographic maps prepared by the United States
Geologic Survey (USGS), and have been located on the property and possess characteristics that qualify
it to be a stream. Each feature that is checked "Not Subject" has been determined not to be a stream or
is not present on the property. There may be other streams located on your property that do not show up
on the maps referenced above but still may be considered jurisdictional according to the US Army Corps
of Engineers and/or the North Carolina Division of Water Resources.
This on -site determination shall expire five (5) years from the date of this letter. Landowners or
affected parties that dispute a determination made by Johnston County may request a
determination by the Director of the Division of Water Resources c/o the 401 and Buffer
Permitting Unit, or its successor. An appeal request must be made within sixty (60) days of the
date of this letter or from the date the affected party (including downstream and/or adjacent
owners) is notified of this letter. A request for a determination by the Director must be submitted
in writing with a copy of this letter to:
North Carolina Division of Water Resources
401 & Buffer Permitting Unit
1650 Mail Service Center
Raleigh, North Carolina 27699-1650
This determination is final and binding unless, as detailed above, a request for an appeal has been
made in writing within sixty (60) days.
The owner/future owners should notify the Division of Water Resources (including any Local,
State, and Federal Agencies) of this decision concerning any future correspondences regarding the
subject property (stated above). This project may require a Section 404/401 Permit for the
proposed activity. Any inquiries should be directed to the US Army Corps of Engineers Raleigh
Regulatory Field Office at [phone] and the Division of Water Resources 401 & Buffer
Permitting Unit at [phone].
If you have any questions regarding this determination, please feel free to contact Carlos Bagley at (919)
209-8333 or via email at carlos.bagley(dijohnstonnc.com.
Sincerely,
Carlos Bagley, PE
Enviromnental Manager

Riparian Buffer 1 Stream Determination
u n
FEATURE A (PO N ❑ ), •
Not Subject
FEATURE Al - Subject
below pond at existing
tree lisle
FEATURE E (UPPER
POW - Not Subject.
Feature not shown on
soils rnap.
Johnston County Public Utilities
309 E. Market Street
P.Q. Box 2263
Smithfield, NC 27577
FEATURE E -Not
S L bject
1
QM 4$r3-'.)'S r'.VD
FEATURE C .Subic:::
FEATURE D - SI.Dject
FEATURE F (LOWER
POND) - Subject
:FEATURE G - Si.! e-cr
IFEATURE H - Not
Subject. Feature not
shown on soils map.
Soil Survey of Johnston County
North Carolina
USDA Soil Conservation Service
1994
Properly Info:
Sandra S. Allen
9638 Cleveland Road
Clayton, NC 27520
FIN# /6360C-54-ben0
Tomas Franklin Allen, Jr.
2426 Cornwallis Road
Garner, NC 27529
PI J# 16300-63-2285

Riparian Buffer / Stream Determination
FEATURE A - Not
Subject.
FEATURE E (UPPER
,POND - Not Subject
J r -
Johnston County Public Utilities
309 E. Market Street
P.O. Box 2263
Smithfield, NC 27577
FEATURE F (LOWER
FOND) - Subject
FEATURE H - Not
Subject
USGS Topographical Map
Edmondson Quad
7.5-Minute Series
2013
Property Info:
Sandra S. Allen
9638 Cleveland Road
Clayton, NC 27520
PIN# 1636DC-64-5620
Thomas Franklin Allen, Jr.
242S Cornwallis Road
Garner, NC 27529
PIN# 16300-63-2285

Cleveland Bluffs Stream Restoration Plan
5r Gi
Attachment 6
Post -Development Impacts to Stream and Wetlands and Proposed Mitigation Restoration of
Channel
10

w
w a
o
w01
I
,
(
' 31Y0
+6 SNtlVW3b
ON �.
o
ry
o =
3
o a
/061/10 J)S SiJ119 ONVIlA317
""' Od NIa4P7V /9
�)� vzvie oN.(sJa3NMo
S0I '13l V JYV3&S
SI3VdJ0103F 13130-1S0d
HSNNAL Nn� NI 0 �o
NOFi1JO S SJL1I) �CNV13A31J
ao, san��a t„Vd3,
> v v
0 v v
w v A
a
0
II
Q
A o N -- Il
> v�'� Lu / `--//
0
I// N \\ i
I I
I I �� `` 0 Q Q j/�Q- \
I z
m
*3.
I I , o
r'zo J '-- ____:,_ _ _,‘,,,, __ �v
�m
cz ,Li
II z iI1111
I I I
/Z�j��� wU t �Iolll
IIZII
0 Z -- - --- -m 0 I
//Q%' III o ���I�
o% poll, aI ��
�I
J
��_� \ ��Y � \ / I
�� d� II II

o
31 Y0
+6 SN8VN3b
ON A.
A¢
Z a =
( ,
6JbBZ J� NaVPNS'Zb9
0n 'nrld ON YSJa3NMo
�J
e2oa
CO
0 �(V/�/] w � �
hV7LSMI�/IS Si�nB Ot'1VIlA317
wrc
¢r
. �
h
I
2 Q
1J JV tl1S3a'73NNVlp
r ""nOeHswuo o�vvn ii°'N ais"�o
..:o ° B°o
�'�
w
CL
V z
�3� NOu�u� �ad
nnsinaens SI4 CNV73
� h
NN
ao
o s
o
R
N
O
NI
U
Q
I
W
W
I I
I
l I�LR R7
I'6T
Z
O
m
W
v = IY
W Q
O 5
O
, / O
EX, 24" R.0 PIPE
(INV. BURIED 0.4)
APPROX. POND
W
2
U
cn
r-j
2 X
8�
v
I
I
EASON
m) so 0
CHANNEL TYPICAL SECTION
/
2
/
Q O
I
Liii
Z
2
O
W
z
T
g
�O
cc2, I / m
Z I 2
\ z ,
Q
Qi O
Qi
X Q
O
a
Q
/=jam//
REMOVE EX. IRE
EX L07 LINES
PIPE "DAYLIGHT"
1:41
CHANNEL THALWEG (INVERT)
USE PATH
I ea GRADED SHOULD
GS
3:1 SLOPE 70
EX, 24" R.0 PIPE
(INV. BURIED 0.4 )
co
z 2777771110
o
o
R N N

0
1
o �
'xi NO
3,0
,
SNNVY3b
ON I.
Z '' =
A¢
( ,
IN�I�
6JbBZ J07 NaZZZb9
°n 'aViNSU,V7N, ONYSJa3Nn10
�J g ` ¢
'er
'
O
0�(61, � �
1067/1I09OS Imo ONV13ATO
oa wrc
a � ¢r
2
N711tlM71S3N 73NNVIW
""nO^eHrswuo o"�vvn ii�'N ais"r�o
B°o
..:o���
,�;°
zN
�"
V z Q
70d1M70 IN3WW3S Y N060N3 03S0d7Nd
'NM
NOIV IO ns Si3018/ONV13A3YJ
z
w
>
�9h` aLL o
o s
o
a s s
r
> >
I I
I r
I I
f
�
/ / /
. /
d/ Z Qzs
/ � /
wz w ,,
�� �
"
IiI1a
�� w
Q��Z
a� o�,
2
00
W
Z
oz
- CS
SILS FL
} ao,ozso aaNO5a
NOTES
9 OF PALLETS NUST SS PROVIDES TO ELEVATE SRL EVILRE
5 ISLTER BAC FOR EEL -WATERING ABOVE NATURAL GROUND
SPECIAL STILLING BASIN
ZQ
w I- 2
// �m ��
,
/ m c, vi
W m C,O
Z Z � Oa
� � Z Z
/^ Z � �.
U Z
111
mO
0 - --
Z
1
't f
/ X
II
h
I
2 V
..'g' mQ
.._.
J
l
Ill
22
E--
w
w
Q
o
Z
Z
CD,
8Ll
Ll
,,.
0
0-1
Z
x
w
\ /
1\ ��
sN
.6'
,
,
zga� as
ice`
\II
IO
6'
�3�N=aN
'
\/,�\
\ \ \ \
\-
\ ,--III
II
Wy
Q
... ��
; • Z O
z Z
m OZ
$o 0 00
G8poo -? £s ompai
\�- UIIZ
\ wI•
\cvs
xx
_N Me��na8ob�a omwx q`��

HEC-RAS Plan: Channel River: Channel Reach: 1
Reach
River Sta
Profile
Q Total
Min Ch El
W.S. Elev
Vel Chnl
Shear Chan
Vel Left
Shear LOB
Vel Right
Shear ROB
(cfs)
(ft)
(ft)
(ft/s)
(Ib/sq ft)
(ft/s)
(Ib/sq ft)
(ft/s)
(Ib/sq ft)
1
522.82
2-YR
29.33
275.00
276.73
3.09
0.84
1
522.82
10-YR
56.37
275.00
277.19
3.90
1.18
1.11
0.31
1.11
0.31
1
522.82
25-YR
73.98
275.00
277.41
4.28
1.36
1.41
0.45
1.41
0.45
1
522.82
100-YR
103.72
275.00
277.73
4.80
1.62
1.75
0.62
1.75
0.62
1
500
2-YR
29.33
274.68
276.43
3.05
0.81
1
500
10-YR
56.37
274.68
276.89
3.83
1.14
1.11
0.31
1.11
0.31
1
500
25-YR
73.98
274.68
277.11
4.22
1.32
1.40
0.44
1.40
0.44
1
500
100-YR
103.72
274.68
277.42
4.76
1.59
1.74
0.61
1.74
0.61
1
400
2-YR
29.33
273.27
274.94
3.29
0.95
1
400
10-YR
56.37
273.27
275.39
4.14
1.36
1.10
0.32
1.10
0.32
1
400
25-YR
73.98
273.27
275.61
4.50
1.53
1.43
0.47
1.43
0.47
1
400
100-YR
103.72
273.27
275.94
4.99
1.77
1.79
0.66
1.79
0.66
1
300
2-YR
29.33
271.86
273.69
2.82
0.68
0.34
0.05
0.34
0.05
1
300
10-YR
56.37
271.86
274.17
3.53
0.94
1.10
0.28
1.10
0.28
1
300
25-YR
73.98
271.86
274.40
3.89
1.10
1.34
0.39
1.34
0.39
1
300
100-YR
103.72
271.86
274.73
4.38
1.32
1.64
0.53
1.64
0.53
1
200
2-YR
29.33
270.67
272.31
3.38
1.01
1
200
10-YR
56.37
270.67
272.76
4.22
1.42
1.09
0.32
1.09
0.32
1
200
25-YR
73.98
270.67
272.98
4.62
1.62
1.43
0.48
1.43
0.49
1
200
100-YR
103.72
270.67
273.29
5.16
1.91
1.81
0.69
1.82
0.69
1
100
2-YR
29.33
269.05
270.77
3.12
0.85
1
100
10-YR
56.37
269.05
271.23
3.93
1.21
1.11
0.31
1.11
0.32
1
100
25-YR
73.98
269.05
271.45
4.32
1.39
1.41
0.45
1.41
0.45
1
100
100-YR
103.72
269.05
271.77
4.83
1.65
1.75
0.62
1.76
0.63
1
82.37
2-YR
29.33
268.80
270.52
3.12
0.85
1
82.37
10-YR
56.37
268.80
270.98
3.93
1.21
1.11
0.31
1.11
0.31
1
82.37
25-YR
73.98
268.80
271.20
4.31
1.39
1.41
0.45
1.41
0.45
1
82.37
100-YR
103.72
268.80
271.52
4.83
1.64
1.76
0.63
1.76
0.63

Page 1 of 2
CHANNEL ANALYSIS WORKSHEET
Date: 12/22/2020 Computed: JFO Checked: HSR CSD Engineering
3 N. Main Street
Suite D
Project: Cleveland Bluffs Subdivsion (JC# 19-096-P) Wendell, NC 27591
919.624-0997
Q Discharge (cfs) A Flow Area (sf)
Zreq (Q x n)/(1.49 x Slope^0.5) P Wetted Perimeter (ft)
B Base Width (ft) R Hydraulic Radius (ft)
Y Normal Depth (ft) V Velocity (fps)
M1 Left Side Slope Zav A*RA2/3
M2 Right Side Slope T Shear Stress (psf) 62.4 x Y x Slope
n Manning's Roughness Coefficient (Reference 1; Table 3, Charts 5 thru 9)
Tp Permissable Shear Stress (Reference 1; Table 2)
Reference 1: FHWA Hydraulic Engineering Circular No. 15, Publication No. FHWA-IP-87-7, 1988
(5)csD
Station: 0' TO 440'
Description: Channel Mitigation
Q=
Slope =
n=
Zreq =
29.3 cfs
0.0143 ft/ft
0.069
11.4 ft
2-Year Channel
Class C Vegetation with coir matting
B
Y
M1
M2
A
P
Zav
T
Tp
Remarks
3.0
1.5
3.0
3.0
11.3
12.5
0.90
2.4
10.5
1.34
4.00
Stable
Q=
Slope =
n=
Zreq =
29.3 cfs
0.0143 ft/ft
0.053
8.7 ft
Class D Vegetation with coir matting
B
Y
M1
M2
A
P
Zav
T
Tp
Remarks
3.0
1.50
3.0
3.0
11.3
12.5
0.90
3.1
10.5
1.34
4.00
Stable
Station: 0' TO 440'
Description: Channel Mitigation
Q=
Slope =
n=
Zreq =
56.4 cfs
0.0143 ft/ft
0.060
18.9 ft
10-Year Channel
Class C Vegetation with coir matting
B
Y
M1
M2
A
P
Zav
T
Tp
Remarks
3.0
2.0
3.0
3.0
18.0
15.6
1.15
3.3
19.8
1.78
4.00
Stable
Q=
Slope =
n=
Zreq =
56.40 cfs
0.0143 ft/ft
0.066
20.9 ft
Class D Vegetation with coir matting
B
Y
M1
M2
A
P
Zav
T
Tp
Remarks
3.0
1.0
3.0
3.0
5.6
9.0
0.62
2.0
4.0
0.85
4.00
Stable

Page 2 of 2
CHANNEL ANALYSIS WORKSHEET
Date: 12/22/2020 Computed: JFO Checked: HSR CSD Engineering
3 N. Main Street
Suite D
Project: Cleveland Bluffs Subdivsion (JC# 19-096-P) Wendell, NC 27591
919.624-0997
Q Discharge (cfs) A Flow Area (sf)
Zreq (Q x n)/(1.49 x Slope^0.5) P Wetted Perimeter (ft)
B Base Width (ft) R Hydraulic Radius (ft)
Y Normal Depth (ft) V Velocity (fps)
M1 Left Side Slope Zav A*RA2/3
M2 Right Side Slope T Shear Stress (psf) 62.4 x Y x Slope
n Manning's Roughness Coefficient (Reference 1; Table 3, Charts 5 thru 9)
Tp Permissable Shear Stress (Reference 1; Table 2)
Reference 1: FHWA Hydraulic Engineering Circular No. 15, Publication No. FHWA-IP-87-7, 1988
Station: 0' TO 440'
Description: Channel Mitigation
Q = 103.7 cfs
Slope = 0.0143 ft/ft
n = 0.055
Zreq = 31.8 ft
100-Year Channel
Class C Vegetation with temporary matting
B
Y
M1
M2
A
P
Zav
T
Tp
Remarks
3.0
2.5
3.0
3.0
25.4
18.5
1.37
4.0
31.3
2.19
4.00
Stable
Q = 103.70 cfs
Slope = 0.0143 ft/ft
n = 0.045
Zreq = 26.5 ft
Class D Vegetation with temporary matting
B
Y
M1
M2
A
P
Zav
T
Tp
Remarks
3.0
2.3
3.0
3.0
22.4
17.4
1.29
4.6
26.6
2.03
4.00
Stable

Cleveland Bluffs Stream Restoration Plan
5r Gi
Attachment 7
Pond Berm Removal
12