20000874_Other Documents_20130611 (3)

SITE 7
SITE 6
-YI-
SITE MA
-Y2- (EXISTING US 22D)
SITE 5
SITE 4
SITE 3
SITE 2
SITE I
N. C. DEPT. OF TRANSPORTATIION
DIVISION OF HIGHWAYS
MONTGOMERY COUNTY
PROJECT: 8.T&50803 (R- 2231CBi)
US 220 BYPASS
HFIE • 2 OF 25

VICINITY
N. C. DEPT. OF TRANSP40RTATION
DIVISION OF HIGKWAYS
MONTGOMERY COUNTY
PROJECT:8.TS50803 (IFL- 2231CB)
US 220 BYPASS
SHEET I OF 35 9102
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END PROJECT
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VICINITY
N. C. DEPT. OF TRANSP40RTATION
DIVISION OF HIGKWAYS
MONTGOMERY COUNTY
PROJECT:8.TS50803 (IFL- 2231CB)
US 220 BYPASS
SHEET I OF 35 9102

- -WLB— WETLAND BOUNDARY
WETLAND
L
® DENOTES FILL IN
WETLAND
®DENOTES FILL IN
SURFACE WATER
® DENOTES FILL
SURFACE WATER
IPDND)
®DENOTES TEMPORARY
FILL IN WETLAND
® DENOTES EXCAVATION
IN WETLAND
DENOTES TEMPORARY
FILL IN SURFACE WATER
• ; • • DENOTES MECHANIZED
••% ••• CLEARING
-- FLOW DIRECTI ©N
TB
—� TOP OF BANK
-- -WE - -- EDGE OF WATER
— C — PROP. LIMIT OF CUT
— -E- ---
PROP. LIMIT OF FILL
`— PROP. RIGHT OF WAY
— - NG--
-- -- NATURAL GROUND
-- -J�L-- - PROPERTY LINE
—TDE—
TEMP. DRAINAGE
EASEMENT
- --POE—
PERMANENT DRAINAGE
EASEMENT
— EAB- --
EXIST. ENDANGERED
ANIMAL BOUNDARY
—EPB—
EXIST. ENDANGERED
PLANT BOUNDARY
----- - - - -
-- WATER SURFACE
LEGEND
LIVE STAKES
BOULDER
COIR FIBER ROLLS
5 ADJACENT PROPERTY OWNER
OR PARCEL NUMBER
3:::� PROPOSED BRIDGE
PROPOSED BOX CULVERT
PROPOSED PIPE CULVERT
(DASHED LINES DENOTE
EXISTNG STRUCTURES)
SINGLE TREE.
WOODS LINE
■ DRAINAGE INLET
mm ROOTWAD
VANE
Ana RIP RAP
RIP RAP ENERGY
DISSIPATOR BASIN
N. C. DEPT. OF TRANSPORTATION
DIVISION OF HIGHWAYS
MONTGOMERY COUNTY
PROJECT. 8.TS50805
SHEET OF

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The proposed stream was designed to retain the bankfull characteristics of the reference
stream. To aid in bank stability, log vanes and rootwads are proposed in the bend /pool
areas. Also, permanent soil reinforcement mat will be placed on the banks along the
entire proposed reach. This will enable vegetation to establish along the stream banks.
Based on surveyed data in the field and analyzed information provided by the NCSRI, the
tributary to Rocky Ford Branch was classified as an E5 stream. According to Rosgen's
Applied River Morphology, E5 streams are characterized as "hydraulically efficient
channel forms" with a "high sediment transport capacity" and a "high resistance to plan
form adjustment which results in channel stability without significant downcuttimg."
They are found in broad alluvial valleys with well developed floodplains. The stream
banks "are composed of materials finer than that of the dominant channel bed materials
and are typically stabilized with extensive riparian or wetland vegetation that forms
densely rooted sod mats from grasses, as well as woody species." The ES stream retains
these very stable characteristics "unless the stream banks are disturbed and significant
changes in sediment supply and/or streamflow occur."
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NCDOT Project ID# R- 223IC13
Montgomery County
US 220 Bypass from south of SR 1524 to
Existing four -lane section of US 220, North of US 220 alternate
Prepared by: Sungate Design Group, PA
915 -A Jones Franklin Road
Raleigh, NC 27606
April 13, 2001
NATURAL CHANNEL DESIGN
RIGHT OF STA. 254 +60 -L-
The proposed new location US 220 will cause a shift in the existing stream at +/- 254 +60
--L -. The existing and proposed charuie s were classifiW according to principles
proposed by Dave Rosgen.
The existing stream drains 44 Ha (109 Acres) of a rural agricultural area. The first order
perennial stream drains an existing pastureland into a hardwood forest at the poirat of
relocation. The channel was found to be perennial with riffles, pools, and aquatic
wildlife.
There are no hydraulic gage data available on this stream nor on nearby streams. Current
discharges were estimated using NCDOT procedures for rural watersheds and calibrated
to the field observed bankfull depth.
The existing channel is relatively stable in the hardwood forest and has pattern and
dimension. The data gathered was used to classify the reach to be relocated as an E5
stream according to the Rosgen classification procedure.
Because of the development in the present climatic era, a reference reach of a stable
stream in this area is unlikely. A portion upstream of the site and at the site was used as a
representative reach to reference pattern and dimension. The portion used for a reference
was found to have characteristics of an E5 stream. The dimensions gathered in the field
compared favorably to the regional curves developed by the North Carolina Stream
Restoration Institute. Using these reference characteristics and the regional curves
Sungate Design has recommended a natural stream design by replacing the existimg E5
channel with a stable E5 channel.
Bankfull mean depth was found to be 0.2m (0.7 ft). With this information a proposed
channel was designed to maintain a low width/depth ratio and a high entrenchmemt ratio.
Sinuosity was increased slightly, as well as, the radius of curvature. These modifiications
will encourage a decrease of energy along the channel banks.
SHT « OF -t5

A pebble count was conducted in the pools and riffles. Velocities were obtained using
standard engineering procedures. These velocities were compared to shear stresses
predicted by the pebble count. The pebble count confirmed the channel hydraulics by
qualifying the velocities that have moved bed form material. This material has been
classified as a fine to medium sand. The proposed channel was designed to maintain
velocities and appropriate shear stress that will transport this type of material at bankfull
stage without aggrading or degrading the stream banks or bed.
The proposed channel utilizes cross wanes and root wads to direct flow away from the
banks and help create pools and riffs to encouraged aquatic habitat. Finally, native
woody vegetation will be used to stabilize the proposed flood plain and channel banks.
SHT 1� OF 35

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SH T rq OF 35

PEBBLE COUNT
Site: Trib, To Big Mountain Crk. +/- 254 +60 -L- R- 2231CB Date: 4 -05 -01
Party: WHW,FFF,RHK
PartirlP rni I ntc
Inches
Particle
Millimeter
Riffles
Pools
Total No.
Item %
% Cumulative
Silt/Clay
< 0.062
S/C
16
0
16
16%
16%
Very Fine
-062 - .125
S
36
0
36
36%
52%
Fine
.125-.25
A
28
0
28
28%
80%
Medium
.25-.50
N
8
0
8
8%
88%
Coarse
.50-1.0
D
12
0
12
12%
100%
.04-.08
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1.0-2.0
S ': ''
0
0
0
0%
100%
.08 - 16
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2.0-4.0
0
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0%
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.16-.22
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4.0-5.7
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0
0
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0%
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.22-.31
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5.7-8.0
R
0
0
0
0%
100%
.31-.44
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8.0-11.3
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0
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0%
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.44-.63
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11.3-16.0
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0
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100%
.63-.89
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16.0-22.6
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0
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.89-1.26
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0%
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1.26-1.771
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32.0-45.0
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0
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.1.77-2.51
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45.0 --64-.0
0
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64-90
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5.0-7.1
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128-180
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7.1 - 10.1
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0
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10.1 - 14.3
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256-362
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14.3-20
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362-512
L„ ::
0
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512-1024
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100%
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3 60%
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Morphological Measurement Table for R -2231 CB
Stream @ Site 6
Variables
Existing
Channel
Proposed
Reach
USGS Station
Reference Reach
Stream @ Site #3
1. Stream type(Rosgen Classification)
E5
E5
na
E5
2. Drainage area (Ac)
74
74
na
109
3. Bankfull width (Fr)
5.9
6.5
na
6.9
4. Bankfull mean depth (Fr)
0.69
0.6
na
0.65
5. Width /depth ratio
8.6
10.8
na
10.5
6. Bankfull cross - sectional area (FT^3)
13.1
13.4
na
14.8
7. Bankfull mean velocity (Fr /s)
2.8
2.8
na
3.3
8. Bankfull discharge, cfs
11
11.3
na
12.4
9. Bankfull max depth (riffle)
1
1
na
1.2
10. Width of floodprone area (FT)
13.8
16.4
na
25
11. Entrenchment ratio
2.3
2.4
na
3.6
12. Meander length (FT)
28
44
na
52
13. Ratio of meander length to Bankfull
width
4.7
6.8
na
7.6
14. Radius of curvature (FT)
8.2
10
na
13
15. Ratio of radius of curvature to bankfull
width
1.35
1.5
na
1.9
16. Belt width (FT)
9.8
11
na
11.5
17. Meander width ratio
1.7
1.7
na
1.7
18. Sinuosity (stream length/valley length)
1.4
1.4,
na
1.2
19. Valley slope (FT /FT)
0.0125
0.0125
na
0.0122
20. Average slope
valley slope/Sinuosity
0.0086
0.0096
na
0.00991
21. Pool slope (FT /Fr
0.005
0.005
na
0.005
22. Ratio of pool slope to average slope
0.58
0.52
na
0.54
23. Maximum pool depth (FT)
1.3
1.3
na
2.2
24. Ratio of pool depth to average
bankfull depth
1.9
2.2
na
3.3
25. Pool width(FT)
3.9 -10.2
4.9 -10.2
na
6.2 -8.2
26. Ratio of pool width to bankfull width
0.67 -1.7
0.75 -1.6
na
0.9 -1.2
27. Pool to pool spacing (FT)
3.6 -14.8
4.9 -16.4
na
15 -Jun
28. Ratio of pool to pool spacing to
bankfull width -
0.61 -2.5
0.75 -2.5
na
2.85 -7.11
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NCDOT Project ID# R -2231 CB
Montgomery County
US 220 Bypass from south of SR 1524 to
Existing four -lane section of US 220, North of US 220 alternate
Prepared by: Sungate Design Group, PA
915 -A Jones Franklin Road
Raleigh, NC 27606
April 13, 2001
NATURAL CHANNEL DESIGN
RIGHT OF STA. 268 +40 —L-
The proposed new location US 220 will cause a shift in the existing stream at +/- 268 +40
—L -. The existing and proposed channels were classified according to principles
developed by Dave Rosgen.
The existing stream drains 30 Ha (74 Acres) of a rural hardwood forested area. The first
order perennial stream drains an existing hardwood forest at the point of relocation. The
channel was found to be perennial with riffles, pools, and aquatic wildlife.
There are no hydraulic gage data available on this stream nor on nearby streams. Current
discharges were estimated using NCDOT procedures for rural watersheds and calibrated
to the field observed bankfull depth.
The existing channel is relatively stable in the hardwood forest and has pattern and
dimension. The data gathered was used to classify the reach to be relocated as an E5
stream according to the Rosgen classification procedure.
Because of the development in the present climatic era, a reference reach of a stable
stream in this area is unlikely. A portion of the existing stream at station 254 +60 —L-
was used as a representative reach to reference pattern and dimension. The portion used
for a reference was found to have characteristics of an E5 stream. The dimensions
gathered in the field compared favorably to the regional curves developed by the North
Carolina Stream Restoration Institute. Using these reference characteristics and the
regional curves Sungate Design has recommended a natural stream design by replacing
the existing E5 channel with a stable E5 channel.
Bankfull mean depth was found to be 0.18m (0.6 ft). With this information a proposed
channel was designed to maintain a low width/depth ratio and a high entrenchment ratio.
Sinuosity was maintained with an increase in the radius of curvature. These
modifications will encourage a decrease of energy along the channel banks.
SHT 29 OF 35

A pebble count was conducted in the pools and riffles. Velocities were obtained using
standard engineering procedures. These velocities were compared to shear stresses
predicted by the pebble count. The pebble count confirmed the channel hydraulics by
qualifying the velocities that have moved bed form material. This material has been
classified as a fine to medium sand. The proposed channel was designed to maintain
velocities that will transport this type of material at bankfull stage without aegrading or
degrading the stream banks or bed.
The proposed channel utilizes cross vanes and root wads to direct flow away from the
banks and help create pools and riffles to encouraged aquatic habitat. Finally, native
woody vegetation will be used to stabilize the proposed flood plain and channel banks.
SH T 30 OF 35

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SH T 3 t OF 35°

PFRRI F r0l JNT
Site: Trib. To Big Mountain Crk. +/- 268 +40 -R2231 CB
Date: 4 -05 -01
Party: WHW, FFF, RHK
Particle Counts
Inches
Particle
Millimeter
Riffles.
Pools
Total No.
Item %
% Cumulative
Silt/Clay
< 0.062
S/C
12
0
12
12%
12%
Very Fine
.062-.125
S
24
0
24
24%
36%
Fide
.125-.25
A
24
0
24
24%
60%
Medium
.25-.50
N
8
0
8
8%
68%
Coarse
.50-1.0
D
4
0
4
4%
72%
04,08
Very Coarse
1.0 - 2.0
S
0
0
0
1 0%
72%
.08-.16
Very Fine
2.0-4.0
0
0
0
0%
72%
,16-.22
Fine
4.0-5.7
'G.
0
0
0
0%
72%
.22-.31
Fine
5.7-8.0
.,,R.
6
0
6
6%
78%
.31 - .44
Medium
8.0-11.3
,A
10
0
10
10%
88%
.44-.63
Medium
11.3-16.0
:::. „':.V..
8
0
8
8%
96%
.63-.89
Coarse
16.0-22.6
` E
4
0
4
4%
100%
.89-1.26
Coarse
22.6-32.0
L
0
0
0
0%
100%
1.26-1.77
Very Coarse
32,0-45.0
: - S..
0
0
0
0%
100%
.1,77-2.5
Very Coarse
45.0-64.0
'`
0
0
0
0%
100%
2.5-3.5
Small
64-90
; ' C:
0
0
0
0%
100%
3.5-5.0
Small
90-128
Q
0
0
0
0%
100%
5.0-7.1
Large
128-180
$
0
0
0
0%
100%
7.1 - 10.1
Large
180-256
L ..:`
0
0
0
0%
100%
10.1-14.3
Small
256-362
.8..`:
0
0
0
0%
100%
14.3-20
Small
362-512
;:<,;;;::::
0
0
0
0%
100%
20-40
Medium
512-1024
D, .
0
0
0
0%
100%
40-80
Lrg- Very Lrg
1024 - 2048
.,:.,,;R:; >;<:
0 ,
0
0
0%
100%
Bedrock
[,BPR)<A
0 1
0 1
0%
100%
Totals 100 0 100 100% 100%
Particle Size Distribution
100%
90%
80%
70%
E 60%
U
c 50%
�a
40%
c 30%
W
c 20%
10%
0%
0.1 1 10 100 1000
Particle Size - Millimetter -
SHT 32 OF 35

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