20100063 Ver 1_Stormwater Info_20100727

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Diffused Flow
Calculations
Franklin County Hub Road
Connection Road - US 401
To Franklin County Municipal Airport
Revised July 20, 2010
Hobbs, L'pchurc•h & Associates, P.A.
Consulting Engineers
drainage FK0702 SWM [over
11 07 AM an Date: 7.20.2010
S =
12975 =
'?O.2'?tiGINE?P'•?
Page 1 J 1
Precipitation Frequency Data Server
POINT PRECIPITATION` t*"
FREQUENCY ESTIMATES
FROM NOAA ATLAS 14 `?., .
`
Confidence Limits
North Carolina 36.0275 N 78.3371 W318 feet
fro m "Precipitation-Frequency Atlas of the t inited States" NOAA Atla; 14. Volume _'. Version .
G.M. Bonnin. D. Martin. B. Lin. 'F. Parzybok. M.Yekta. and I) Riley
NOAA. National Weather Service. Silver Spring. Maryland. 2(X)4
Extracted: Wed Jul 21 2010
Seasonality I Related Info GIS data I Maps ) DOCS
PrPrinitatinn FrPanenev Fstimates (inches)
Page 1 of 4
Retum to State Map
10 20 30 45 6(I
ARI* 5 10 IS 30 60 120 3 hr 6 hr 12 hr 24 hr 48 hr 4 day, 7 day &, & d du day
(years) n
mi min min min min min ay i

* Upper bound of the 90% confidence interval
Precipitation Frequency Estimates (inches)
60 120 3 6 12 24 48 7 10 20 30 45 60
ARI 5 10 15 30
F
Z
v
day 11 day 11 day 11 day 11 day
a
(years) min min min min min hr hr hr hr hr day
F 0.45 0.71 0.89 1.22 1.52 1.80 1.93 2.31 E70:]13 10 3.59 4.01 4.65 5.29 7.07 8.74 11.06 13.23
0 0.51 0.82 1.03 1.43 1.79 2.12 2.28 2.73 3.20 3.75 4.33 4.81 5.55 6.30 8.35 10.29 12.96 15.45
=[0 5 80.93 1.18 1.68 2.15 2.58 2.77 3.32 3.91 4.72 5.41 5.95 6.79 7.59 9.90 12.01 14.89 17.53

1.05 1.3 6.39 19.14
10 0.66 31.93 2.51 3.04 3.29 3.95 4.69 5.49 6.27 6.85 7.778.62 11.14 13.35 1

25 3 1.17 1.48 2.19 2.91 3.58 3.91 4.71 5.63 6.55 7.45 8.11 9.14 10.02 12.81 15.14 18.36 21.24
0.7
F -1
50 0.79 1.26 1.60 2.41 3.26 4.07 4.49 5.42 6.50 7.42 8.39 9.12 10.23 11.13 14.16 16.53 19.86 22.83
100 0.85 1.34 1.70 2.60 3.58 4.54 5.05 6.13 7.40 8.33 9.38 10.18 11.38 12.29 15.53 17.93 21.37 24.39
200 0.90 1.42 1.79 2.79 3.91 5.03 5.65 6.88 8.38 9.29 10.44 11.29 12.57 13.47 16.95 19.35 22.87 25.92
500 0.95 1.SU 1.89 3.01 4.32 5.67 6.45 7.91 9.72 10.65 11.91 12.84 14.23 15.11 18.90 21.26 24.89 27.94
1000 1 AU 1.58 1.98 3.21 4.69 6.27 7.23 8.91 11.03 11.75 13.12 14.09 15.58 16.42 20.44 22.75 26.44 29.47
i he upper bound or the connaence mtervai at au /o connaence ievei is me vawe wmon o-ro or me smuiaieu quanwe va1UeS ioi a ywen aequency ma yrgln1 u
These precipitation frequency estimates are based on a oartial duration series. ARI is the Average Recurrence Interval.
Dl-- -f- 1n ^10r. 7: All- 1 n rbvv -t fnr m- inform Minn Mr1TG Fnrmattinn nm-tC adimataC nant 7Rm to minci.ar aA 7Arn
* Lower bound of the 90% confidence interval
Precipitation Frequency Estimates (inches)
ARI** 5 10 15 30 60 120 3 6 12 24 48 4 7 10 20 30 45 60
F
(years) min
0 0.37 hr day day day day day day day
min min min min min F r hr hr hr
4 2 4.10 4.676.29 7.84 10.01 12.04
0.60 0.75 1.02 1.28 1.49 1.58 1.89 2.24 2.70 3.1 3.5
?2 0.43 0.69 0.87 1.20 1.51 1.77 1.89 2.25 2.67 3.26 3.79 4.23 4.89 5.56 7.44 9.23 11.73 14.05
0 0.49 0.79 0.99 1.41 1.81 2.15 2.29 2.74 3.26 4.10 4.72 5.23 5.97 6.71 8.82 10.77 13.46 15.94
10 0.55 0.88 1.12 1.62 2.11 2.53 2.71 3.26 3.89 4.75 5.46 6.01 6.82 7.60 9.91 11.95 14.79 17.39
25 0.61 0.97 1.24 1.83 2.44 2.96 3.21 3.87 4.65 5.66 6.46 7.08 7.99 8.80 11.36 13.51 16.53 19?5
httn://hdsc.nws.noaa.gov/cgi-bin/hdsc/buildout.perl?type=pf&units=us&series=pd&statena... 7/21/2010
oea?o rnfcr to Hr1oa ANac 1d rri-imant fnr mnrc infnrmatinn NOTF Fnrmattinn forces estimates near zero to aDDear as zero.

Erosion Control Construction Sequence
' 1. Obtain erosion control permit and all other applicable permits prior to any land
disturbing activity.
' 2. Schedule a pre-construction conference with the owner, all contractors for land
disturbance and erosion control authority personnel to discuss the project and the

' erosion control plan.
3. Install temporary gravel construction entrance/exit at location depicted on sheet EC-I

' and EC-6.
4 Construction limits throughout the site shall be flagged.
' 5. Prior to land disturbing, install silt fence, sediment basins, diversion swales and check
dams at the locations shown on the approved erosion control plan.
Install stream crossing and stone access road as shown on sheet EC-12.
Clear only enough to install these devices.
Sediment basins shall remain in place until construction of the site is completed and
' stabilized.
6. Initiate clearing, grubbing and topsoil stripping of the site.
r 7. Begin grading activities. Maintain all erosion control measures.
' 8. As construction progresses, remove silt and sediment buildups at all silt fencing,
diversions, check dams and sediment basins to maintain adequate erosion control
measures.
' 9. Install storm drainage with inlet and outlet protection measures.
When installing the box culverts, first install the multiple HDPE bypass pipes, then
install the sandbag coffer dams as shown on sheet EC-12, then proceed with the
installation of the box culverts.
10. Provide a groundcover (temporary or permanent) on exposed slopes within 21
calendar days following completion of any phase of grading; and, a permanent
groundcover for all disturbed areas within 15 working days or 90 calendar days
(whichever is shorter) following completion of construction or development.
11. Continue with fine grading of the site.
3
12. When construction is complete and all soil areas stabilized, install erosion control
measures for the proposed level spreaders and wet ponds.
13. When level spreaders and wet ponds are complete and all soil areas stabilized, call for
on-site inspection by the site engineer and sedimentation and erosion control
inspector.
14. If the site is approved, remove temporary erosion control measures as directed, seed,
fertilize and mulch resulting disturbed areas. Clear all pipes, inlets, swales and basins
that will remain free of all debris and sediment accumulation. Establish permanent
stabilizing vegetation during the appropriate time of year.
15. Upon established and stabilizing vegetation, call for final site erosion and
sedimentation control inspection and approval.
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Outlet #1
sed trap FK0702 Outlet Cover 10 44 AM on Date: 6/12010
Page 1 of 1

ARA V
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NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely filled out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)!
L PROJECT INFORMATION
Project name Franklin County Hub Road
' Contact name Tom Wanko
Phone number 910.692-5616
Date May 18, 2010
' Drainage area number #1
II. DESIGN INFORMATION
For Level Spreaders Receiving Flow From a BMP
' Type of BMP
Drawdown flow from the BMP cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area 527,748.00 ft2
Impervious surface area 23,718.00 ft
Percent impervious 4.49 %
' Rational C coefficient 0.33
Peak flow from the 1 in/hr storm 4.00 cfs
Time of concentration 6.70 min
Rainfall intensity, 10-yr storm 6.44 in/hr
' Peak flow from the 10-yr storm 25.75 cfs
Where Does the Level Spreader Discharge?
To a grassed bioretention cell? N (Y or N)
To a mulched bioretention cell? N (Y or N)
To a wetland? N (Y or N)
To a filter strip or riparian buffer? Y (Y or N) Please complete filter step characterization below.
' Other (specify)
Fitter Strip or Riparian Buffer Characterization (if applicable)
Width of grass 30.00 ft
Width of dense ground cover ft
Width of wooded vegetation ft
Total width 30.00 ft
Elevation at downslope base of level lip 315.30 fmsl
Elevation at top of bank of the receiving water 313.25 fmsl
Slope (from level lip to to top of bank) 6.83 %
Are any draws present? N (Y or N) OK
Level Spreader Design
Forebay surface area 47.00 sq ft OK
Feet of level lip needed per cfs 13 ft/cfs
Answer "Y" to one of the following:
Length based on the 1 in/hr storm? Y (Y or N)
Length based on the 10-yr storm? N (Y or N)
Length based on the BMP discharge rate? N (Y or N)
Design flow 4.00 cfs
Is a bypass device provided? Y (Y or N) OK
Form SW401-Level Spreader, Fitter Strip, Restored Riparian Buffer-Rev.5 Parts I. and II. Design Summary, page 1 of 2

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Length of the level lip
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
y
Peak velocity in the channel during the 10-yr storm
Channel lining material
52.00 ft Level spreader length OK.
N (Y or N)
N (Y or N)
Y (Y or N)
4.00 ft
10.00 ft
1.00 ft
25.75 cfs
P300 Polypropylene
• •
t i Y
M
i B i
Form SW401-Level Spreader, Fitter Strip, Restored Riparian Buffer-Rev.5
l
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M
Parts I. and 11. Design Summary, page 2 of 2
JUL REQUIRED ITEMS CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met, If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Pagel Plan
Initials Sheet No.
TF w f • 1. Plans (1" - 50' or larger) of the entire site showing:
Design at ultimate build-out,
Off-site drainage (if applicable),
Delineated drainage basins (include Rational C coefficient per basin),
Forebay (if applicable),
- High flow bypass system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROW), and
- Boundaries of drainage easement.
TF W DF 2. Plan details (1" = 30' or larger) for the level spreader showing:
- Forebay (if applicable),
- High flow bypass system,
- One foot topo lines between the level lip and top of stream bank,
- Proposed drainage easement, and
- Design at ultimate build-out.
1 FW DF • 1 3. Section view of the level spreader (1" = 20' or larger) showing:
Underdrain system (if applicable),
- Level lip,
- Upslope channel, and
Downslope filter fabric.
NA 4. A date-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.
'V V0 G AU.5 5. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
TF L.) 6. The supporting calculations.
TF W 7. A copy of the signed and notarized operation and maintenance (0&M) agreement.
N 8. A copy of the deed restrictions (if required).
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Part III, page 1 of 1

C

Level Spreader Supporting Calculations
Area - #1
Time of Concentration Caicuiations
Input
Lqmth of Watershed 1,205 FT
Hftht of Watershed 42 FT
q#Put
Tirm of Concentration Minutes 6.70
I P*ak hrtene Caiculatlorn
Finding The 10yr, @ Te 0.72 inches
b r"di attached tart
Qnytc min 6.44 inches/hour ,,
ak ow Calcut0lons
AM 527 ,748 SF 12.12 Acres
t
lo ment im rvious Area 0 SF 0.00 Acres
t t iou8 Area 23,718 SF 0.54 Acres
t 0.00%
Post 4.49%
ft!:!je?v? KWRReqIC**I 1! -7 0.30
ost-dev C 0,33
Fiagtfa[t 1.0 in
1 6.44 in/hr
Peak AoM 'r/!wslorna 7-1
owl 3.96 W/sec {
e develWnent aj?r,p;a Iro-w - { _
= C'I`A Q ° 23.42 ft /sec
10,yr. Peak {{ ...
C`C'A 25 52 ft/sec

2% of d* totnrtbu area's i bus sufjrce 47 SF
4-*Vil IpM!gff MW Des n
f. vyek fength z G.10'

H z9 1.26'
r

' Hub Road
Diffuse Swale Calculations
Entrance Swale No. 1
' Q=CIA C= 0.33 1= 1 A= 12.12 Quo = 4.00 CFS
channel calculator for bare earth swale
Given Input Data: Computed Results:
Shape ........................... Trapezoidal Depth .......................... . 0.6302 ft
Solving for ..................... Depth of Flow Velocity ........................ 3.3239 fps
Flowrate ........................ 4.0000 cfs Full Flowrate ................ ... 87.0103 cfs
Slope ........................... 0.0100 ft/ft Flow area ..................... .. 1.2034 ft2
Manning's n ..................... 0.0200 Flow perimeter ............. ..... 4.0218 ft
Height .......................... 2.0000 ft Hydraulic radius ........... ..... 0.2992 ft
Bottom width .................... 0.0000 ft Top width ..................... .. 3.8193 ft
Left slope ...................... 0.3300 ft/ft (V/H) Area ............................ 12.1212 ft2
Right slope..................... 0.3300 ft/ft (V/H) Perimeter ..................... .. 12.7642 ft
' Percent full ................... . 31.5089%
channel calculator for permanent grass swale
Given Input Data: Computed Results:
Shape ........................... Trapezoidal Depth ........................... 0.7773 ft
Solving for ..................... Depth of Flow Velocity ........................ 2.1846 fps
' Flowrate ........................ 4.0000 cfs Full Flowrate ................. .. 49.7202 cfs
Slope ........................... 0.0100 ft/ft Flow area ...................... . 1.8310 ft2
Manning's n ..................... 0.0350 Flow perimeter .............. .... 4.9610 ft
' Height .......................... 2.0000 ft Hydraulic radius ............ .... 0.3691 ft
Bottom width .................... 0.0000 ft Top width ...................... . 4.7111 ft
Left slope ...................... 0.3300 ft/ft (V/H) Area ............................ 12.1212 ft2
Right slope ..................... 0.3300 ft/ft (V/H) Perimeter ...................... . 12.7642 ft
' Percent full .................... 38.8663%
Temporary Liner Desien
' Permissible Unit Shear Stress, Td
T=yds Lining Type Ibs/ft.2
t= Shear Stress in Ibs/ft.2 straw w/ tack coat 0.35
y= Unit weight of water 62.4 Ibs/ft.3 S75 straw w/ net 1.55
d= Flow depth in ft. P300 polypropylene 3.00
' s= Channel Gradient in ft./ft. P550 polypropylene 4.00
d50 Stone Size (inches)
d= 0.63 ft. 1 0.33
s= 0.01 ft. /ft. 2 0.67
' t= 0.39lb/ft.` 6 2
9 3
12 4
' Lining Required: S75 Straw w/ Net 15 5
18 6
21 7.8
24 8

u

C

1

Hub Road
Diffuse Swale Calculations
Bypass Swale No. 1
Qio=CIA C= 0.33 1= 6.44 A= 12.12 Quo = 25.75 CFS
channel calculator for bare earth swale
Given Input Data: Computed Results:
Shape ........................... Trapezoidal Depth ........................... 0.4608 ft
Solving for ..................... Depth of Flow Velocity ........................ 10.2637 fps
Flov rate ........................ 25.7500 cfs Full Flowrate ................ ... 110.3113 cfs
Slope ........................... 0.0750 ft/ft Flow area ..................... .. 2.4864 ft2
Manning's n ..................... 0.0200 Flow perimeter ............. ..... 6.9407 ft
Height .......................... 1.0000 ft Hydraulic radius ........... ..... 0.3582 ft
Bottom width .................... 4.0000 ft Top width ...................... . 6.7925 ft
Left slope ...................... 0.3300 ft/ft (V/H) Area ............................ 7.0303 ft2
Right slope ..................... 0.3300 ft /ft (V/H) Perimeter ...................... . 10.3821 ft
Percent full ................... . 46.0769%
channel calculator for permanent grass swale

Given Input Data: Computed Results:
Shape ........................... Trapezoidal Depth ........................... 0.6244 ft
Solving for ..................... Depth of Flow Velocity ........................ 6.9363 fps
Flowrate ........................ 25.7500 cfs Full Flowrate ................. .. 63.0350 cfs
Slope ........................... 0.0750 ft/ft Flow area ...................... . 3.6792 ft2
Manning's n ..................... 0.0350 Flow perimeter .............. .... 7.9851 ft
Height .......................... 1.0000 ft Hydraulic radius ............ .... 0.4608 ft
Bottom width .................... 4.0000 ft Top width ...................... . 7.7844 ft
Left slope ...................... 0.3300 ft/ft (V/H) Area ............................ 7.0303 ft2
Right slope ..................... 0.3300 ft/ft (V/H) Perimeter ...................... . 10.3821 ft
Percent full .................... 62.4418%
Temporary Liner Design
Permissible Unit Shear Stress, Td
T=yds Lining Type Ibs/ft.z
t= Shear Stress in Ibs/ft.z straw w/ tack coat 0.35
y= Unit weight of water 62.4 Ibs/ft.3 S75 straw w/ net 1.55
d= Flow depth in ft. P300 polypropylene 3.00
s= Channel Gradient in ft./ft. P550 polypropylene 4.00
d50 Stone Size (inches)
d= 0.62 ft. 1 0.33
S= 0.08 ft./ft. 2 0.67
t= 2.90lb/ft.z 6 2
9 3
12 4
Lining Required: P300 Polypropylene ] 15 5
18 6
21 7.8
24 8
11

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Ouffet #213
Page
>ed trap FK0702 Cutlet Cover 3 44 P*d on Date: 6,912010 1 of 1
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ATA • rVry'??A?1c,
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' NCDENR
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STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely filled out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)I
IL PROJECT INFORMA7t0111i
Project name Franklin County Hub Road
Contact name Tom Wanko
Phone number 910-692-5616
Date May 18, 2010
Drainage area number #213
It. DESIGN INFORUT 1
For Level Spreaders Receiving Flow From a BMP
Type of BMP
Drawdown flow from the BMP cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area
Impervious surface area
Percent impervious
Rational C coefficient
Peak flow from the 1 in/hr storm
Time of concentration
Rainfall intensity, 10-yr storm
Peak flow from the 10-yr storm
Where Does the Level Spreader Discharge ?
To a grassed bioretention cell?
To a mulched bioretention cell?
To a wetland?
' To a filter strip or riparian buffer?
Other (specify)
44,695.00 ft19,740.00 ft' 44.17 %

0.56
0.57 cis
5.00 min
7.2 in/hr
4.14 cfs
N (Y or N)
N (Y or N)
N (Y or N)
Y (Y or N) Please complete filter step characterization below.
Filter Strip or Riparian Buffer Characterization (if applicable)
' Width of grass 30.00 ft
Width of dense ground cover ft
Width of wooded vegetation ft
Total width 30.00 ft
' Elevation at downslope base of level lip 285.15 fmsl
Elevation at top of bank of the receiving water 282.75 fmsl
Slope (from level lip to to top of bank) 8.00 %
' Are any draws present? N (Y or N) OK
Level Spreader Design
Forebay surface area 39.00 sq ft OK
Feet of level lip needed per cfs 13 ft/cfs
Answer 'Y' to one of the following:
Length based on the 1 in/hr storm? Y (Y or N)
' Length based on the 10-yr storm? N (Y or N)
Length based on the BMP discharge rate? N (Y or N)
Design flow 0.57 cfs
Is a bypass device provided? Y (Y or N) OK

Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5
Parts I. and II. Design Summary, page 1 of 2
Length of the level lip
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
y
Peak velocity in the channel during the 10-yr storm
Channel lining material
13.00 ft Level spreader length OK.
N (Y or N)
N (Y or N)
Y (Y or N)
2.00 ft
3.00 ft
11.00 ft
2.00 ft
4.14 cfs
P300 Polypropylene
W

M

/ l
M
Form SW401-Level Spreader, Fitter Strip, Restored Riparian Buffer-Rev.5 Parts I. and II. Design Summary, page 2 of 2
I ill. REQUIRED ITEMS CHECKUSt
' Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
' Pagel Plan
Initials Sheet No.
TFw IDF,3_ 1. Plans (1" - 50' or larger) of the entire site showing:
- Design at ultimate build-out,
- Off-site drainage (if applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Forebay (if applicable),
- High flow bypass system,
- Maintenance access,
' - Proposed drainage easement and public right of way (ROW), and
- Boundaries of drainage easement.
TF W F- 31 2. Plan details (1" = 30' or larger) for the level spreader showing:
' - Forebay (if applicable),
- High flow bypass system,
- One foot topo lines between the level lip and top of stream bank,
t - Proposed drainage easement, and
- Design at ultimate build-out.
DF-9 3. Section view of the level spreader (1" = 20' or larger) showing:
Underdrain system (if applicable),
- Level lip,
Upslope channel, and
Downslope filter fabric.
TPW C 5. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
TV- W 6. The supporting calculations.
t f'W 7. A copy of the signed and notarized operation and maintenance (0&M) agreement.
8. A copy of the deed restrictions (if required).
4. A date-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.
I Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Part III, page 1 of 1

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1
Level Spreader Supporting Calculations
Area - #2/3
1
I
750 FT
[HOWK of WASObW 35 FT
b wq- •. w. -
44,695 SF
1.03 Acres
0 SF 0.00 Acres
p? r 19,740 SF 0.45 Acres

F

1
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1
1

0.00% ...
id to 44.17%
'
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° '" - ?.
M "t
Ow 0 A
POO
4)

0.30

,
,•
p - 0.56
fi I
1.0 in

Q
7.20 in/hr S
F, se
. .
bOO *w 10
.
0.58 ft /sec
'

.., .: f w 2.22 ft /sec
OjjW
1pr, 11pw ?+R!)
,,A e Q * 4.17 ft/sec

2'96ie° a>rr+a?s 39 SF

4 9 weir long x 3 0.07'

3 ?Nfela
?# RE1 # x 3 0.38'

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? ? '?` ?Lr'•? tip Tx'-G.x .. , ? =',? ? ? ?
f'.`
7 ? `
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Hub Road
Diffuse Swale Calculations
Entrance Swale No. 2/3
Q=CIA C= 0.56 1= 1 A= 1.03 010 = 0.57 CFS
channel calculator for bare earth swale
Given Input Data: Computed Results:
Shape ........................... Trapezoidal Depth ........................... 0.2707 ft
Solving for ..................... Depth of Flow Velocity ........................ 2.5669 fps
Flowrate ........................ 0.5700 cfs Full Flowrate ................ ... 18.5880 cfs
Slope ........................... 0.0184 ft/ft Flow area ..................... .. 0.2221 ft2
Manning's n ..................... 0.0200 Flow perimeter ............. ..... 1.7276 ft
Height .......................... 1.0000 ft Hydraulic radius ........... ..... 0.1285 ft
Bottom width .................... 0.0000 ft Top width ..................... .. 1.6406 ft
Left slope ...................... 0.3300 ft/ft (V,fH) Area ............................ 3.0303 ft2
Right slope ..................... 0.3300 ft/ft (V/H) Perimeter ..................... .. 6.3821 ft
Percent full ................... . 27.0702%
channel calculator for permanent grass swale

Given Input Data: Computed Results:
Shape ........................... Trapezoidal Depth ........................... 0.3339 ft
Solving for ..................... Depth of Flow Velocity ........................ 1.6871 fps
Flowrate ........................ 0.5700 cfs Full Flowrate ................ ... 10.6217 cfs
Slope ........................... 0.0184 ft/ft Flow area ..................... .. 0.3379 ft2
Manning's n ..................... 0.0350 Flow perimeter ............. ..... 2.1310 ft
Height .......................... 1.0000 ft Hydraulic radius ........... ..... 0.1585 ft
Bottom width .................... 0.0000 ft Top width ...................... . 2.0237 ft
Left slope ...................... 0.3300 ft/ft (V/H) Area ............................ 3.0303 ft2
Right slope ..................... 0.3300 ft/ft (V/H) Perimeter ...................... . 6.3821 ft
Percent full ................... . 33.3910%
Temporary Liner Design
Permissible Unit Shear Stress, Td
T=yds Lining Type Ibs/ft.2
t= Shear Stress in Ibs/ft.z straw w/ tack coat 0.35
y= Unit weight of water 62.4 Ibs/ft.3 S75 straw w/ net 1.55
d= Flow depth in ft. P300 polypropylene 3.00
s= Channel Gradient in ft./ft. P550 polypropylene 4.00
d50 Stone Size (inches)
d= 0.27 ft. 1 0.33
S= 0.02 ft./ft. 2 0.67
t= 0.31lb/ft.2 6 2
9 3
12 4
Lining Required: S75 Straw W/ Net 15 5
18 6
21 7.8
24 8
1

1
Qto=CIA C= 0.56
t

L?

Hub Road
Diffuse Swale Calculations
Bypass Swale No. 2/3
1= 7.2 A= 1.03 Q10 =
4.14 CFS
channel calculator for bare earth swale
Given Input Data: Computed Results:
Shape ........................... Trapezoidal Depth ........................... 0.1561 ft
Solving for ..................... Depth of Flow Velocity ........................ 8.0064 fps
Flowrate ........................ 4.1400 cfs Full Flowrate ................. .. 462.5469 cfs
Slope ........................... 0.1600 ft/ft Flow area ...................... . 0.5171 ft2
Manning's n ..................... 0.0200 Flow perimeter .............. .... 3.6982 ft
Height .......................... 2.0000 ft Hydraulic radius ............ .... 0.1398 ft
Bottom width .................... 3.0000 ft Top width ...................... . 3.6245 ft
Left slope ...................... 0.5000 ftlft (V/H) Area ............................ 14.0000 ft2
Right slope ..................... 0.5000 ft/ft (V/H) Perimeter ...................... . 11.9443 ft
Percent full ................... . 7.8058%
channel calculator for permanent grass swale

Given Input Data: Computed Results:
Shape ........................... Trapezoidal Depth ........................... 0.2167 ft
Solving for ..................... Depth of Flow Velocity ........................ 5.5632 fps
Flowrate ........................ 4.1400 cfs Full Flowrate ................. .. 264.3125 cfs
Slope ........................... 0.1600 ft/ft Flow area ...................... . 0.7442 ft2
Manning's n ..................... 0.0350 Flow perimeter .............. .... 3.9693 ft
Height .......................... 2.0000 ft Hydraulic radius ............ .... 0.1875 ft
Bottom width .................... 3.0000 ft Top width ...................... . 3.8670 ft
Left slope ...................... 0.5000 ft/ft (V/H) Area ............................ 14.0000 ft2
Right slope ..................... 0.5000 ft/ft (V/H) Perimeter ...................... . 11.9443 ft
Percent full ................... . 10.8371 %
Temporary Liner Design
Permissible Unit Shear Stress, Td
T=vds Lining Type lbs/ft.2
t= Shear Stress in Ibs/ft.2 straw w/ tack coat 0.35
y= Unit weight of water 62.4 Ibs/ft.3 S75 straw w/ net 1.55
d= Flow depth in ft. P300 polypropylene 3.00
s= Channel Gradient in ft./ft. P550 polypropylene 4.00
d50 Stone Size (inches)
d= 0.16 ft. 1 0.33
S= 0.16 ft./ft. 2 0.67
t= 1.60lb/ft .2 6 2
9 3
12 4
Lining Required: P300 Polypropylene 15 5
18 6
21 7.8
24 8

sed trap FK0702 Outlet Cover
Outlet #415
3 57 PM on Date: 6ig12010
Page 1 of 1

W „FTr
A
A
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely filled out, printed and submitted.
DO NOT FORGET TO ATTAC H THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)!
1. PROJECT INFORMATION
Project name Franklin County Hub Road
Contact name Tom Wanko
Phone number 910-692-5616
Date May 18, 2010
Drainage area number #4/5
II. DESIGN INFORMATI t
For Level Spreaders Receiving Flow From a BMP
Type of BMP
Drawdown flow from the BMP cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area
Impervious surface area
Percent impervious
Rational C coefficient
Peak flow from the 1 in/hr storm
Time of concentration
Rainfall intensity, 10-yr storm
Peak flow from the 10-yr storm
Where Does the Level Spreader Discharge?
To a grassed bioretention cell?
To a mulched bioretention cell?
To a wetland?
To a filter strip or riparian buffer?
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass
Width of dense ground cover
Width of wooded vegetation
Total width
Elevation at downslope base of level lip
Elevation at top of bank of the receiving water
Slope (from level lip to to top of bank)
Are any draws present?
Level Spreader Design
Forebay surf ace area
Feet of level lip needed per cfs
Answer "Y" to one of the following:
Length based on the 1 in/hr storm?
Length based on the 10-yr storm?
Length based on the BMP discharge rate?
Design flow
Is a bypass device provided?
670,387.00 ft'
34,450.00 ft
5.14 %
0.33
5.08 cfs
8.37 min
6.02 in/hr
30.57 cfs
N (Y or N)
N (Y or N)
Y (Y or N) Please complete filter step characterization below.
N (Y or N)
30.00 ft
ft
ft
30.00 ft
242.15 fmsl
242.00 fmsl
0.50 % OK
N (Y or N) OK
69.00 sq ft OK
13 ft/cfs
Y (Y or N)
N (Y or N)
N (Y or N)
5.08 cfs
Y (Y or N) OK
Form SW401-Level Spreader, Fitter Strip, Restored Riparian Buffer-Rev.5 Parts I. and II. Design Summary, page 1 of 2
Length of the level lip
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
8
W
y
Peak velocity in the channel during the 10-yr storm
Channel lining material
67.00 ft Level spreader length OK.
N (Y or N)
N (Y or N)
Y (Y or N)
2.00 ft
4.00 ft
12.00 ft
2.00 ft
30.57 cfs
S75 Straw w/Net
•
M
y
i B i
M

Form SW401-Level Spreader, Fitter Strip, Restored Riparian Buffer-Rev.5 Parts I. and II. Design Summary, page 2 of 2

Ili. REQUIRED ITEMS CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Pagel Plan
Initials Sheet No.
TPw OF-4 1. Plans (1" - 50' or larger) of the entire site showing:
Design at ultimate build-out,
Off-site drainage (if applicable),
Delineated drainage basins (include Rational C coefficient per basin),
- Forebay (if applicable),
High flow bypass system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROW), and
Boundaries of drainage easement.
TPw 0 r- 4 2. Plan details (1" = 30' or larger) for the level spreader showing:
Forebay (if applicable),
- High flow bypass system,
One foot topo lines between the level lip and top of stream bank,
- Proposed drainage easement, and
Design at ultimate build-out.
DO ' 9 3. Section view of the level spreader (1" = 20' or larger) showing:
Underdrain system (if applicable),
Level lip,
Upslope channel, and
Downslope filter fabric.
4. A date-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.
5. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
T'Pw 6. The supporting calculations.
jYvJ 7. A copy of the signed and notarized operation and maintenance (0&M) agreement.
A 8. A copy of the deed restrictions (if required).
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5
Part III, page 1 of 1
1
1
1
1
1
1
1
1
1
1
1
1
1
Level Spreader Supporting Calculations
Area - #4/5
me of conoentration Calcuations
ir4xd
Length of Watershed 1,755 FT
Nainht of WntArshari 73 FT
Time of Concentration Minutes 8.37
1 .PeakIntensity C*Icuatbns
Finding The 10yr, c 0.84 inches
b reading attached chart
in m n * mkAw 6.02 inches/hour,
ak t?r11aw Caktatlans
Inage Area 670,387 SF 15.39 Acres
t fotm Args 0 SF 0.00 Acres
ostydev t lmus Ares 34,450 SF 0.79 Acres
re-deyWq"ent ions Perbentage 0.00%
ast-d meat i Pertentage 5.14%

0.30
ea$t Coeflent C 0.33

Rwinfall d- 1.0 in
10 , fair"I f!' i 6.02 in/hr

Peak flow 1'/hr storm
= CTA 5.09 ft /sec

Pner?vsk pment 1 t yr,pe flow
= C't'A Q 27.79 ft /sec
ost-development 10-yr, peak K-w (0)
?ti C"IAA Q' 30.65 ft /sec

orobay Design
t `
0.2% of ft contribyMV area's impervious suface 69 SF

?twl Spreader Weir Design
H = Q/ weir length x era 0.10'

Hess Swale Weir Design
H = weir tength x 1.43'

'
Hub Road
Diffuse Swale Calculations
' Bypass Swale No. 4/5
' Q1o=CIA C= 0.33 1= 6.02 A= 15.39 Q10 = 30.57 CFS
channel calculator for bare earth swale
' Given Input Data: Computed Results:
Shape ........................... Trapezoidal Depth ........................... 0.7195 ft
Solving for ..................... Depth of Flow Velocity ........................ 7.8115 fps
Flowrate ........................ 30.5700 cfs Full Flowrate ................ ... 216.4913 cfs
Slope ........................... 0.0250 ft/ft Flow area ..................... .. 3.9135 ft2
Manning's n ..................... 0.0200 Flow perimeter ............. ..... 7.2178 ft
Height .......................... 2.0000 ft
Bottom width .................... 4.0000 ft Hydraulic radius ...........
Top width ..................... ..... 0.5422 ft
.. 6.8781 ft
Left slope ...................... 0.5000 ft/ft (V/H) Area ............................ 16.0000 ft2
Right slope ... ... 0.5000 ft/ft (V/H) Perimeter ....................... 12.9443 ft
Percent full .................... 35.9759%
channel calculator for permanent grass swale
Given Input Data: Computed Results:
Shape ........................... Trapezoidal Depth ........................... 0.9758 ft
Solving for ..................... Depth of Flow Velocity ........................ 5.2639 fps
Flowrate ........................ 30.5700 cfs Full Flowrate ................... 123.7093 cfs
Slope ........................... 0.0250 ft/ft Flow area ....................... 5.8075 ft2
Manning's n ..................... 0.0350 Flow perimeter ............. ..... 8.3639 ft
Height .......................... 2.0000 ft Hydraulic radius ................ 0.6944 ft
Bottom width .................... 4.0000 ft Top width ...................... . 7.9032 ft
Left slope ...................... 0.5000 ft/ft (V/H) Area ............................ 16.0000 ft2
Right slope ..................... 0.5000 ft/ft (V/H) Perimeter ...................... . 12.9443 ft
' Percent full .................... 48.7894%
Temp orary Liner Design
' Permissible Unit Shear Stress, Td
T=yds Lining Type Ibs/ft.2
' t= Shear Stress in Ibs/ft.2 straw w/ tack coat 0.35
y= Unit weight of water 62.4 Ibs/ft.3 S75 straw w/ net 1.55
d= Flow depth in ft. P300 polypropylene 3.00
s= Channel Gradient in ft./ft. P550 polypropylene 4.00
d50 Stone Size (inches)
d= 0.98 ft. 1 0.33
s= 0.03 ft./ft. 2 0.67
' t= 1.53 lb/ft.2 6 2
9 3
12 4
' Lining Required: S75 Straw w/Net 15 5
18 6
21 7.8
' 24 8
1
1
1

1
1
1

sed trap FK0702 Outlet Cover
Outlet #6
10.29 AM on Date: W12010
Page 1 of 1

1
u

1
I
1

r
r
1
n
1
1
1
AN"'A
NCDENR

STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely filled out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)I
Ill. PROJECT INFORMATION 7771
Project name Franklin County Hub Road
Contact name Tom Wanko
Phone number 910-692-5616
Date May 18, 2010
Drainage area number #6
tl. DESIGN INFORMATit3F1
For Level Spreaders Receiving Flow From a BMP
Type of BMP
Drawdown flow from the BMP cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area
Impervious surface area
Percent impervious
Rational C coefficient
Peak flow from the 1 in/hr storm
Time of concentration
Rainfall intensity, 10-yr storm
Peak flow from the 10-yr storm
Where Does the Level Spreader Discharge?
To a grassed bioretention cell?
To a mulched bioretention cell?
To a wetland?
To a filter strip or riparian buffer?
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass
Width of dense ground cover
Width of wooded vegetation
Total width
Elevation at downslope base of level lip
Elevation at top of bank of the receiving water
Slope (from level lip to to top of bank)
Are any draws present?
Level Spreader Design
Forebay surface area
Feet of level lip needed per cfs
Answer "Y" to one of the following:
Length based on the 1 in/hr storm?
Length based on the 10-yr storm?
Length based on the BMP discharge rate?
Design flow
Is a bypass device provided?
28,520.00 ftZ
14,560.00 ftZ
51.05 %
0.61
0.40 cfs
5.00 min
7.2 in/hr
2.88 cfs
N (Y or N)
N (Y or N)
N (Y or N)
Y (Y or N) Please complete filter strip characterization below.
30.00 ft
ft
ft
30.00 ft
233.25 fmsl
230.90 fmsl
7.83 %
N (Y or N)
29.00 sq ft
13 ft/cfs
OK
OK
N (Y or N)
Y (Y or N)
N (Y or N)
2.88 cis
N (Y or N) A bypass device is not needed.
I Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Parts I. and II. Design Summary, page 1 of 2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Length of the level lip
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
y
Peak velocity in the channel during the 10-yr storm
Channel lining material
38.00 ft Level spreader length OK.
N (Y or N)
(Y or N) Do not complete this section of the worksheet.
(Y or N) Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
cfs Do not complete this section of the worksheet
Do not complete this section of the worksheet.
W

t
:---
--------- y'
M M
: B :
Form SW401-Level Spreader, Fitter Strip, Restored Riparian Buffer-Rev.5 Parts I. and II. Design Summary, page 2 of 2

' iH. REQUIRED ITEMS CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
' Pagel Plan
Initials Sheet No.
(~t'w I D5 - 5 1. Plans (1" - 50' or larger) of the entire site showing:
' - Design at ultimate build-out,
- Off-site drainage (if applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Forebay (if applicable),
- High flow bypass system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROW), and
- Boundaries of drainage easement.
D 2. Plan details (1" = 30' or larger) for the level spreader showing:
Forebay (if applicable),
- High flow bypass system,
- One foot topo lines between the level lip and top of stream bank,
- Proposed drainage easement, and
- Design at ultimate build-out.
TFW 09-1 3. Section view of the level spreader (1" = 20' or larger) showing:
Underdrain system (if applicable),
Level lip,
- Upslope channel, and
- Downslope filter fabric.
4. A date-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.
T>Fw _CAL.( 5 5. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
T 6. The supporting calculations.
' 7. A copy of the signed and notarized operation and maintenance (0&M) agreement.
8. A copy of the deed restrictions (if required).
I Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Part III, page 1 of 1
Level Spreader Supporting Calculations
Area - #6
Time of Concentration Calculations
Input
Length of Watershed 530 FT
Height of Watershed 12 FT
Ou ut
Time of Concentration Minutes 5.00
10 Peak Wens Caiculatfons
Finding The 10yr, @ Tc 0.60 inches
b reading afitactted' chart
din c min -6 min/hr 7.20 inches/hour
Peak inftow C*?euwoiat
Drainage Area(A) 28,520 SF 0.65 Acres
Pre-dev I+us 0 SF 0.00 Acres
Pos ` tt4 1 Atoo 14,560 SF 0.33 Acres
Pre-devel Pwoerft 0.00%
Post-de. ant Im kws Pe 51.05%
,

C?f9t 0.30
cs;t C 0.61

RainfaX 1.0 in p
10 , rairdleil intbroky (1) 7.20 in/hr

Peak ftaw '/hr storm
0 = C`I`A Q 0.40 ft /sec =

Pre-development, 10-yr, c w 1?+Q?
R = C" t" A Q 1.41 ft /sec
v,etopme? U yr.; .p r {t?j
*?1 2.86 ft /sec
F
Dest"
Ot
tt7e area`s ions Waco 29 SF

Level S wWr Wek Design
H = Q/ weir x 3 za 0.10'

1
1
11
1
1
1
1
1
1
1
1
1
1
1
1
1
Outlet #7
sed trap FK0702 Outlet Cover 10:44 AM on Date: 6/2/2010
Page 1 of 1

ATA OF `N A 7E?
r
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely filled out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIR ED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)I
L PROJECT INFORMATION
Project name Franklin County Hub Road
Contact name Tom Wanko
Phone number 910-692-5616
Date May 18, 2010
Drainage area number #7
10. 0001111111 NW"ATION
For Level Spreaders Receiving Flow From a BMP
Type of BMP
Drawdown flow from the BMP cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area 75,878.00 ftz
Impervious surface area 11,676.00 ftz
Percent impervious 15.39 %
Rational C coefficient 0.39
Peak flow from the 1 in/hr storm 0.68 cfs
Time of concentration 5.00 min
Rainfall intensity, 10-yr storm 7.2 in/hr
Peak flow from the 10-yr storm 4.89 cfs
Where Does the Level Spreader Discharge ?
To a grassed bioretention cell? N (Y or N)
To a mulched bioretention cell? N (Y or N)
To a wetland? Y (Y or N) Please complete filter strip characterization below.
To a filter strip or riparian buffer? N (Y or N)
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass 30.00 ft
Width of dense ground cover ft
Width of wooded vegetation ft
Total width 30.00 ft
Elevation at downslope base of level lip 233.35 fmsl
Elevation at top of bank of the receiving water 231.00 fmsl
Slope (from level lip to to top of bank) 7.83 %
Are any draws present? N (Y or N) OK
Level Spreader Design
Forebay surface area 25.00 sq ft OK
Feet of level lip needed per cfs 13 ft/cfs
Answer "Y" to one of the following:
Length based on the 1 in/hr storm? N (Y or N)
Length based on the 10-yr storm? Y (Y or N)
Length based on the BMP discharge rate? N (Y or N)
Design flow 4.89 cfs
Is a bypass device provided? N (Y or N) A bypass device is not needed.
Form SW401-Level Spreader, Fitter Strip, Restored Riparian Buffer-Rev.5 Parts I. and II. Design Summary, page 1 of 2
Length of the level lip
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
y
Peak velocity in the channel during the 10-yr storm
Channel lining material

64.00 ft Level spreader length OK.
N (Y or N)
(Y or N) Do not complete this section of the worksheet.
(Y or N) Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet.
ft Do not complete this section of the worksheet
ft Do not complete this section of the worksheet.
cfs Do not complete this section of the worksheet
Do not complete this section of the worksheet.
1
M M
i B i
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Parts I. and II. Design Summary, page 2 of 2

I ill. REQUIRED ITEMS CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
' requirement has not been met, attach justification.
1 Page/ Plan
Initials Sheet No.
_ OE- to 1. Plans (1" - 50' or larger) of the entire site showing:
' Design at ultimate build-out,
Off-site drainage (if applicable),
Delineated drainage basins (include Rational C coefficient per basin),
Forebay (if applicable),
High flow bypass system,
Maintenance access,
Proposed drainage easement and public right of way (ROW), and
' Boundaries of drainage easement.
W DF - 2. Plan details (1" = 30' or larger) for the level spreader showing:
Forebay (if applicable),
High flow bypass system,
One foot topo lines between the level lip and top of stream bank,
Proposed drainage easement, and
' - Design at ultimate build-out.
3. Section view of the level spreader (1" = 20' or larger) showing:
Underdrain system (if applicable),
Level lip,
Upslope channel, and
- Downslope filter fabric.
' 1J A 4. A date-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.
TALC 5. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
TPW 6. The supporting calculations.
7. A copy of the signed and notarized operation and maintenance (0&M) agreement.
8. A copy of the deed restrictions (if required).
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Part III, page 1 of 1

Level Spreader Supporting Calculations
Area - #7
6-saf Concentration Calculations
fi.,ulf
p P 0.00%
Post-deveOxnent im Pwmrtt a 15.39%

F?t1n C 0.30
Post 'Run-off Coeffk*rvt C 0.39

Rak" 2a f- 1.0 in
10 , tail #n 1 7.20 in/hr

oak fk w Vhr St01m
- C rA on 0.68 ft /sec

tB-d?BV!sbprt?r3t yF, 11f?;a?Q? - .
C't*A Q 376 ft /sec
gist-development 40-yr, .pak Aawv
C'I`A all 4.92 ft /sec

D" n
F2eb
0.2% of ate contributing ariea's iouS auface 23 SF

Level Weir n
H= W weir length x 3 0.10'

Am A 75,878 SF 1.74 Acres
Pre-dvv Area 0 SF 0.00 Acres
Post-detr 1 -Arm 11,676 SF 0.27 Acres
Length of Watershed 640 FT
H t of Watershed 15 FT

O
Time of CorwAntratim Minutes 5.00

t Peak Intww i:aicuWa * :.
Finding The 10yr' Q Tc 0.60 inches
by reading attached dot
d(1nytc(n-vinMmW 7.20 inches/hour:

Peak W calo ui onit
Hub Road
Diffuse Swale Calculations
Entrance Swale No. 7
Q=CIA C= 0.39 1= 7.2 A= 1.74 Q10 = 4.89 CFS
channel calculator for bare earth swale
Given Input Data: Computed Results:
Shape ........................... Trapezoidal Depth ........................... 0.2301 ft
Solving for ..................... Depth of Flow Velocity ........................ 4.5240 fps
Flowrate ........................ 4.8900 cfs Full Flowrate ................ ... 72.2798 cfs
Slope ........................... 0.0322 ft/ft Flow area ..................... .. 1.0809 ft2
Manning's n ..................... 0.0200 Flow perimeter ............. ..... 5.4686 ft
Height .......................... 1.0000 ft Hydraulic radius ........... ..... 0.1977 ft
Bottom width .................... 4.0000 ft Top width ..................... .. 5.3946 ft
Left slope ...................... 0.3300 ft/ft (V,/H) Area ............................ 7.0303 ft2
Right slope ..................... 0.3300 f l/ft (V/H) Perimeter ..................... .. 10.3821 ft
Percent full ................... . 23.0111 %
channel calculator for permanent grass Swale
Given Input Data: Computed Results:
Shape ........................... Trapezoidal Depth ........................... 0.3169 ft
Solving for ..................... Depth of Flow Velocity ........................ 3.1113 fps
Flowrate ........................ 4.8900 cfs Full Flowrate ................. .. 41.3028 cfs
Slope ........................... 0.0322 ft/ft Flow area ..................... .. 1.5717 ft2
Manning's n ..................... 0.0350 Flow perimeter ............. ..... 6.0222 ft
Height .......................... 1.0000 ft Hydraulic radius ........... ..... 0.2610 ft
Bottom width .................... 4.0000 ft Top width ...................... . 5.9203 ft
Left slope ...................... 0.3300 ft/ft (V/H) Area ............................ 7.0303 ft2
Right slope ..................... 0.3300 ft/ft (V/H) Perimeter ...................... . 10.3821 ft
Percent full ................... . 31.6857%
Temporary Liner Design
Permissible Unit Shear Stress, Td
T=yds Lining Type Ibs/ft.2
t= Shear Stress in Ibs/ft.2 straw w/ tack coat 0.35
y= Unit weight of water 62.4 lbs/ft.3 S75 straw w/ net 1.55
d= Flow depth in ft. P300 polypropylene 3.00
s= Channel Gradient in ft./ft. P550 polypropylene 4.00
d50 Stone Size (inches)
d= 0.23 ft. 1 0.33
S= 0.03 ft./ft . 2 0.67
t= 0.46lb/ft .2 6 2
9 3
12 4
Lining Required: S75 Straw w/ Net 15 5
18 6
21 7.8
24 8

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Area - #8
I
hdiaw Calculations
1,100 FT
42 FT
Minutes 6.03
Druirave Area A 386,204 SF 8.8 Acres
PLt ft ment Impervious Area 0 SF 0.00 Acres
Post-development Impervious Area 13,300 SF 0.31 Acres
rr ment Impervms Percen o.oo°io
Post meet Impervious Percentage 3.44%

Pre-dev meM Run-off Coefficient c 0.30
Post-develo ent Run-off Coeffident c 0.32

Rainfa# Intensity 10 Year Storm 6.96 in/hr

Pre-Developed Peak Flow fom 10 Year Storm (0)
Q a CTA Q 18.51 ft /sec
Posted Peak Flow from ft 14 Year Sta",(Q)
Q a C*I*A Q ?. 19.79 ft /sec
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Hub Road
Area #8 Calculations
Existing Channel - Un-maintained, Light Vegetation
channel calculator for pre-developed conditions
Given Input Data:
Shape ........................... Trapezoidal
Solving for .................... . Depth of Flow
Flowrate ........................ 18.5100 cfs
Slope ........................... 0.0175 ft/ft
Manning 's n ................... .. 0.0500
Height .......................... 4.0000 ft
Bottom width ................ .... 0.0000 ft
Left slope ...................... 0.0485 ft/ft (V/H)
Right slope .................... . 0.0715 ft/ft (V/H)
Computed Results:
Depth .................. ......... 0.7302 ft
Velocity .............. .......... 2.0061 fps
Full Flowrate ....... ............ 1725.7460 cfs
Flow area ............ ........... 9.2267 ft2
Flow perimeter .... .............. 25.3137 ft
Hydraulic radius .. .............. 0.3645 ft
Top width ............ ........... 25.2700 ft
Area .................... ........ 276.8366 ft2
Perimeter ............ ........... 138.6580 ft
Percent full .......... .......... 18.2562%
channel calculator for post-developed conditions
Given Input Data:
Shape ............
Solving for .....
Flowrate ........
Slope .............
Manning's n ...
Height ............
Bottom width .
Left slope ......
Right slope ....
Computed Results:
............... Trapezoidal Depth ........................... 0.7488 ft
................ Depth of Flow Velocity ........................ 2.0400 fps
............... 19.7900 cfs Full Flowrate ................... 1725.7460 cfs
.............. 0.0175 ft/ft Flow area .................... ... 9.7012 ft2
.................. 0.0500 Flow perimeter ............ ...... 25.9565 ft
.............. 4.0000 ft Hydraulic radius ........... ..... 0.3737 ft
................... 0.0000 ft Top width ..................... .. 25.9116 ft
............... 0.0485 ft/ft (V/H) Area ............................ 276.8366 ft2
................. 0.0715 ft/ft (V/H) Perimeter ..................... .. 138.6580 ft
Percent full .................. .. 18.7198%
1 Permissible Velocity for Sand Loam Unprotected Existing Channels : 2.5 FPS

Hub Road
Area #8 Calculations
Existing Channel - Un-maintained, Dense Vegetation
channel calculator for pre-developed conditions
' Given Input Data:
Shape ........................... Trapezoidal
Solving for ................... .. Depth of Flow
Flowrate .......................
Slope ........................... . 18.5100 cfs
0.0175 ff'ft
Manning's n .................. ... 0.1000
' Height--. ...................
Bottom width ................ 4.0000 ft
.... 0.0000 ft
Left slope ...................... 0.0485 ft /ft (V/H)
Right slope .................... . 0.0715 ft/ft (V/H)

Given Input Data:
Shape ............
' Solving for .....
Flowrate ........
Slope .............
' Manning's n ...
Height ............
Bottom width .
Left slope .......
Right slope ....
Computed Results:
Depth ...............
Velocity ...........
Full Flowrate ....
Flow area .........
Flow perimeter.
Hydraulic radius
Top width .........
Area .................
Perimeter .........
Percent full .......
....... 0.9470 ft
........ 1.1929 fps
.......... 862.8730 cfs
......... 15.5174 ft2
............ 32.8278 ft
............ 0.4727 ft
32.7711 ft
..... 276.8366 ft2
........ 138.6580 ft
........ 23.6754%
channel calculator for post-developed conditions
.............. Trapezoidal
............... Depth of Flow
.............. 19.7900 cfs
............. 0.0175 ft/ft
................. 0.1000
............. 4.0000 ft
................. 0.0000 ft
.............. 0.0485 ft/ft (V/H)
............... 0.0715 ft/ft (V/H)
Computed Results:
Depth ............... ............ 0.9711 ft
Velocity ........... ............. 1.2130 fps
Full Flowrate .... ............... 862.8730 cfs
Flow area ......... .............. 16.3154 ft2
Flow perimeter . ................. 33.6614 ft
Hydraulic radius ................ 0.4847 ft
Top width ......... .............. 33.6032 ft
Area ................. ........... 276.8366 ft2
Perimeter ......... .............. 138.6580 ft
Percent full ....... ............. 24.2766%
t Permissible Velocity for Sand Loam Unprotected Existing Channels : 2.5 FPS

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Area - #9
e of Concenttstion Calculations
Len of Watershed 775 FT
Mei ht of Watershed 16 FT
Time of Concentration Minutes 5.84
r??¦¦¦?? ????+_?
Drainage Area A
236,406 SF
5.43 Acres
re-developmot mpervious Area 0 SF 0.00 Acres
oat-development impervious Area 36,088 SF 0.83 Acres
i
tm rvwus rercenra
t-development Impervious Percentage 15.27%

Pro-devel t Run-off Coeffieier £ 0.30
Post-de t Run-off Cootfktt C 0.39

Rainfall Intensity 10 Year Storm 7.00 in/hr

Pre-D ed Peak Flmv from the 10 Year Storm (q)
= C`I*A Q-w
/sec
11.40 ft
Post-Developed Peak Row from the 10 Year Storm {Q}
= C*t*A p 14.88 ft /sec

Hub Road
Area #9 Calculations
Existing Channel - Un-maintained, Light Vegetation
channel calculator for pre-developed conditions
Given Input Data: Computed Results:
' Shape ............... ............ Trapezoidal Depth ........................... 0.5230 ft
Solving for ....... .............. Depth of Flow Velocity ........................ 1.4879 fps
Flowrate ...........
Slope ................ ............. 11.4000 cfs
........... 0.0150 ft/ft Full Flowrate .................
Flow area ...................... .. 407.5914 cfs
. 7.6617 ft2
Manning's n ..... ................ 0.0500 Flow perimeter .............. .... 29.3155 ft
Height .............. ............ 2.0000 ft Hydraulic radius ............ .... 0.2614 ft
' Bottom width ... ................. 0.0000 ft Top width ...................... . 29.2968 ft
Left slope ......... ............. 0.0345 ft/ft (V/H) Area ............................ 112.0251 ft2
Right slope ....... .............. 0.0370 ft/ft (V/H) Perimeter ...................... . 112.0965 ft
' Percent full .................... 26.1520%
channel calculator for post-developed conditions

1 Given Input Data: Computed Results:
Shape ............ ............... Trapezoidal Depth ........................... 0.5780 ft
Solving for ..... ................ Depth of Flow Velocity ........................ 1.5904 fps
Flowrate ......... ............... 14.8800 cfs Full Flowrate ................. .. 407.5914 cfs
Slope ............. .............. 0.0150 ft/ft Flow area ...................... . 9.3562 ft2
Manning's n ... .................. 0.0500 Flow perimeter .............. .... 32.3954 ft
Height ............ .............. 2.0000 ft Hydraulic radius ............ .... 0.2888 ft
Bottom width .. .................. 0.0000 ft Top width ...................... . 32.3748 ft
Left slope ....... ............... 0.0345 ft/ft (V/H) Area ............................ 112.0251 ft2
Right slope .... ................. 0.0370 ft/ft (V/H) Perimeter ...................... . 112.0965 ft
Percent full .................... 28.8996%
Permissible Velocity for Sand Loam Unprotected Existing Channels : 2.5 FPS

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channel calculator for pre-developed conditions
Given Input Data:
Shape ........................... Trapezoidal
Solving for .................... . Depth of Flow
Flowrate ........................ 11.4000 cfs
Slope ........................... 0.0150 f,1ft
Manning's n ................... .. 0.1000
Height .......................... 2.0000 ft
Bottom width ................ .... 0.0000 ft
Left slope ...................... 0.0345 ft/ft (V/H)
Right slope .................... . 0.0370 ft/ft (V/H)
Hub Road
Area #9 Calculations
Existing Channel - Un-maintained, Dense Vegetation
Computed Results:
Depth ........................... 0.6783 ft
Velocity ........................ 0.8847 fps
Full Flowrate ................. .. 203.7957 cfs
Flow area ...................... . 12.8854 ft2
Flow perimeter .............. .... 38.0175 ft
Hydraulic radius ............ .... 0.3389 ft
Top width ...................... . 37.9932 ft
Area ............................ 112.0251 ft2
Perimeter ...................... . 112.0965 ft
Percent full ................... . 33.9150%
channel calculator for post-developed conditions
Given Input Data:
Shape ................
Solving for .........
Flowrate ............
Slope .................
Manning's n .......
Height ................
Bottom width .....
Left slope ..........
Right slope ........
.......... Trapezoidal
.......... Depth of Flow
.......... 14.8800 cfs
........ 0.0150 ft/ft
............ 0.1000
......... 2.0000 ft
............. 0.0000 ft
.......... 0.0345 ft/ft (V/H)
........... 0.0370 ft/ft (V/H)
Computed Results:
Depth ...................... ..... 0.7496 ft
Velocity .................. ...... 0.9457 fps
Full Flowrate ............ ....... 203.7957 cfs
Flow area ................ ....... 15.7352 ft2
Flow perimeter ........ .......... 42.0117 ft
Hydraulic radius ...... .......... 0.3745 ft
Top width ................ ....... 41.9849 ft
Area ........................ .... 112.0251 ft2
Perimeter ................ ....... 112.0965 ft
Percent full .............. ...... 37.4781 %
Permissible Velocity for Sand Loam Unprotected Existing Channels : 2.5 FPS
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' sed trap FK0702 Outlet Cover 10:44 AM on Date: 612)2010
Page 1 of 1
TA ?
NCDENR
4A
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely filled out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)!
I. PROJECT INFORMATION
Project name Franklin County Hub Road
Contact name Tom Wanko
Phone number 910-692-5616
Date May 18, 2010
Drainage area number #10
NL DESIGN INFOWT
For Level Spreaders Receiving Flow From a BMP
Type of BMP
Drawdown flow from the BMP cfs
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area 103,660.00 ftz
Impervious surface area 0.00 ftz
Percent impervious 0.00 %
Rational C coefficient 0.30
Peak flow from the 1 in/hr storm 0.71 cis
Time of concentration 5.00 min
Rainfall intensity, 10-yr storm 7.2 in/hr
Peak flow from the 10-yr storm 5.14 cfs
Where Does the Level Spreader Discharge ?
To a grassed bioretention cell? N (Y or N)
To a mulched bioretention cell? N (Y or N)
To a wetland? N (Y or N)
To a filter strip or riparian buffer? Y (Y or N) Please complete filter strip characterization below.
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass 30.00 ft
Width of dense ground cover ft
Width of wooded vegetation ft
Total width 30.00 ft
Elevation at downslope base of level lip 290.15 fmsl
Elevation at top of bank of the receiving water 290.00 fmsl
Slope (from level lip to to top of bank) 0.50 % OK
Are any draws present? N (Y or N) OK
Level Spreader Design
Forebay surface area 49.00 sq ft OK
Feet of level lip needed per cfs 13 ft/cfs
Answer "Y" to one of the following:
Length based on the 1 in/hr storm? Y (Y or N)
Length based on the 10-yr storm? N (Y or N)
Length based on the BMP discharge rate? N (Y or N)
Design flow 0.71 cis
Is a bypass device provided? Y (Y or N) OK
I Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Parts I. and It. Design Summary, page 1 of 2
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Length of the level lip
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
y
Peak velocity in the channel during the 10-yr storm
Channel lining material
13.00 ft Level spreader length OK.
N (Y or N)
N (Y or N)
Y (Y or N)
3.00 ft
9.00 ft
1.00 ft
5.14 cfs
P300 Polypropylene

t Y t
•
•---- ---------
M
M
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Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5
Parts 1. and 11. Design Summary, page 2 of 2

III. REQUIRED ITEMS CHECKLIST
' Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent. the agent may initial below. If a
' requirement has not been met, attach justification.
Pagel Plan
Initials Sheet No.
TiA) F - 3 1. Plans (1" - 50' or larger) of the entire site showing:
' - Design at ultimate build-out,
- Off-site drainage (if applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Forebay (if applicable),
- High flow bypass system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROW), and
- Boundaries of drainage easement.
?w F • 2. Plan details (1" = 30' or larger) for the level spreader showing:
Forebay (if applicable),
High flow bypass system,
One foot topo lines between the level lip and top of stream bank,
Proposed drainage easement, and
' Design at ultimate build-out.
3. Section view of the level spreader (1" = 20' or larger) showing:
' Underdrain system (if applicable),
Level lip,
Upslope channel, and
Downslope filter fabric.
4. A date-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.
' T( , G4V, 5. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
TES 6. The supporting calculations.
7. A copy of the signed and notarized operation and maintenance (0&M) agreement.
8. A copy of the deed restrictions (if required).
I Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev-5 Part III, page 1 of 1
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Level Spreader Supporting Calculations
Area - #10
Time of Concentration Calculations
l
Length of Watershed 640 FT
Height of Watershed 43 FT
Output
Time of Concentration Minutes5.00
1 peak inte"Ofty Caiculatlens
Firstling The 10yr. @ To 0.60 inches
by rmdrtg attached chart
in min mWhr 7.20 inches/hour
Peak inflow Cslculs?ions
rainage AM A 103,660 SF 2.38 Acres
PLjtqVeh2pM 0 SF 0.00 Acres
q 0 SF 0.00 Acres
re-dgy P 0.00%
Post-dBV t tkwAeO PPffcwtage- 0.00%

!
ttt 0.30
,
_
float-dmrel mart Run-of Ceaet?cient G 0.30

einfsll' 1.0 L n
10 7.20 in/hr

Peak tbw P/4r storm
G*t'A a. 0.71 ft /sec

10-yr,POak fin' (.
5.14 ft /sec
WO 10-yr, POW flow TQ)
a
r 5.14 ft /sec

n
reA's lous suface
of 0 SF

Level Spreader. Weir Ges n
,
= Q/ weir Isnoth x U 0.08'

'Bypass Swale Weir Design
= Q/ weir length x 3 0.43'

n
1

I Qto=CIA C= 0.3
Hub Road
Diffuse Swale Calculations
Bypass Swale No. 10
1= 7.2 A= 2.38
Q1o = 5.14 CFS
channel calculator for bare earth swale
Given Input Data: Computed Results:
Shape ........................... Trapezoidal Depth ........................... 0.1884 ft
Solving for ..................... Depth of Flow Velocity ........................ 8.0781 fps
Flowrate ........................ 5.1400 cfs Full Flowrate ................. .. 416.9341 cfs
Slope ........................... 0.1300 ft/ft Flow area ...................... . 0.6363 ft2
Manning 's n ..................... 0.0200 Flow perimeter .............. .... 3.8427 ft
Height .......................... 1.0000 ft Hydraulic radius ............ .... 0.1656 ft
Bottom width .................... 3.0000 ft Top width ...................... . 3.7537 ft
Left slope ...................... 0.5000 ft/ft (V/H) Area ............................ 14.0000 ft2
Right slope ..................... 0.5000 ft/ft (V/H) Perimeter ...................... . 11.9443 ft
Percent full .................... 9.4213%
channel calculator for permanent grass swale

Given Input Data: Computed Results:
Shape ........................... Trapezoidal Depth ........................... 0.2611 ft
Solving for ..................... Depth of Flow Velocity ........................ 5.5897 fps
Flowrate ........................ 5.1400 cfs Full Flowrate ................. .. 238.2481 cfs
Slope ........................... 0.1300 ft/ft Flow area ...................... . 0.9196 ft2
Manning's n ..................... 0.0350 Flow perimeter .............. .... 4.1676 ft
Height .......................... 1.0000 ft Hydraulic radius ............ .... 0.2206 ft
Bottom width .................... 3.0000 ft Top width ...................... . 4.0443 ft
Left slope ...................... 0.5000 ft/ft (V/H) Area ............................ 14.0000 ft2
Right slope ..................... 0.5000 ft/ft (V/H) Perimeter ...................... . 11.9443 ft
Percent full ................... . 13.0539%
Temporary Liner Design
Permissible Unit Shear Stress, Td
T=yds Lining Type Ibs/ft.2
t= Shear Stress in Ibs/ft.2 straw w/ tack coat 0.35
y= Unit weight of water 62.4 Ibs/ft.3 S75 straw w/ net 1.55
d= Flow depth in ft. P300 polypropylene 3.00
s= Channel Gradient in ft./ft. P550 polypropylene 4.00
d50 Stone Size (inches)
d= 0.19 ft. 1 0.33
S= 0.13 ft./ft. 2 0.67
t= 1.54 1 b/ft.2 6 2
9 3
12 4
Lining Required: P300 Polypropylene 15 5
18 6
21 7.8
24 8
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Area - #11
Time of Concentration Calculations
t ut
t
e6oh of W*wstl6d 370 FT
Of Yltsken t*d 9 FT

OW?IKI Agee IA
k 0 SF 0.00 Acres
t 5,110 SF 0.12 Acres

37.47%

C 0.30
C 0.52

in tnt6!! 10 Year Stoffn 7.22 in/hr

0.68 ft /sec
?,?,
i?t 44)W t' Y r+i
- 1.19 ft/sec

11

a df Corumtrstbn M 5.00
IrtfiwM a11c?t?tiotnR
13,639 SF 0.31 Acres • .
Hub Road
Area #11 Calcualtions
Proposed Roadside Swale - Maintained
channel calculator for post-developed conditions
Given Input Data:
Shape ............... ............ Trapezoidal
Solving for ....... .............. Depth of Flow
Flowrate ........... ............. 1.1900 cfs
Slope ................ ........... 0.0150 ft/ft
Manning 's n ...... ............... 0.0350
Height .............. ............ 2.0000 ft
Bottom width ... ................. 0.0000 ft
Left slope ......... ............. 0.2000 ft/ft (V/H)
Right slope ....... .............. 0.5000 ft/ft (V/H)
Computed Results:
Depth ........................... 0.4327 ft
Velocity ........................ 1.8163 fps
Full Flowrate ................. .. 70.5645 cfs
Flow area ...................... . 0.6552 ft2
Flow perimeter .............. .... 3.1736 ft
Hydraulic radius ............ .... 0.2064 ft
Top width ...................... . 3.0286 ft
Area ............................ 14.0000 ft2
Perimeter ...................... . 14.6702 ft
Percent full .................... 21.6327%
Permissible Velocity for Sand Loam Unprotected Existing Channels : 2.5 FPS

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7.39 AM on Date: 6110/2010 Page 1 of 1
sed trap FK0702 Outlet Cover
of ,N ?. rFR
A=JfA
p
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
' LEVEL SPREADER, FILTER STR IP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely filled out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)I
'

It PROJECT MtfOWTtON
Project name Franklin County Hub Road
Contact name Tom Wanko
Phone number 910-692-5616
Date May 18, 2010
' Drainage area number #12
M. DEt311t#!! 0 TK
For Level Spreaders Receiving Flow From a BMP
Type of BMP
Drawdown flow from the BMP cis
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area 150,381.00 ftz
Impervious surface area 0.00 ftz
Percent impervious 0.00 %
Rational C coefficient 0.30
' Peak flow from the 1 in/hr storm 1.04 cis
Time of concentration 5.00 min
Rainfall intensity, 10-yr storm 7.2 in/hr
Peak flow from the 10-yr storm 7.46 cfs
Where Does the Level Spreader Discharge ?
To a grassed bioretention cell? N (Y or N)
To a mulched bioretention cell? N (Y or N)
To a wetland? N (Y or N)

' To a filter strip or riparian buffer?
Other (specify) Y (Y or N) Please complete filter strip characterization below.
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass 30.00 ft
' Width of dense ground cover ft
Width of wooded vegetation ft
Total width 30.00 ft
Elevation at downslope base of level lip 232.50 fmsl
Elevation at top of bank of the receiving water 231.00 fmsl
Slope (from level lip to to top of bank) 5.00 % OK
' Are any draws present? N (Y or N) OK
Level Spreader Design
Forebay surface area 56.00 sq ft OK
Feet of level lip needed per cfs 13 ft/cfs
Answer "Y" to one of the following:
Length based on the 1 in/hr storm? Y (Y or N)
Length based on the 10-yr storm? N (Y or N)
Length based on the BMP discharge rate? N (Y or N)
Design flow 1.04 cfs
' Is a bypass device provided? Y (Y or N) OK
' Form SW401-Level Spreader, Fitter Strip, Restored Riparian Buffer-Rev.5 Parts I. and II. Design Summary, page 1 of 2
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Length of the level lip
Are level spreaders in series?
Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
y
Peak velocity in the channel during the 10-yr storm
Channel lining material
14.00 ft Level spreader length OK
N (Y or N)
N (Y or N)
Y (Y or N)
0.00 ft
6.00 ft
1.50 ft
7.46 cfs
P300 Polypropylene

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M
B i
Form SW401-Level Spreader, Fitter Strip, Restored Riparian Buffer-Rev.5

Parts I. and ll. Design Summary, page 2 of 2

I8. REQUIRED ITEMS CHECKLIST
' Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
' requirement has not been met, attach justification.
' Pagel Plan
Initials Sheet No.
T'FVJ D F 1. Plans (1" - 50' or larger) of the entire site showing:
' Design at ultimate build-out,
Off-site drainage (if applicable),
Delineated drainage basins (include Rational C coefficient per basin),
Forebay (if applicable),
High flow bypass system,
Maintenance access,
- Proposed drainage easement and public right of way (ROW), and
Boundaries of drainage easement.
2. Plan details (1" = 30' or larger) for the level spreader showing:
' Forebay (if applicable),
- High flow bypass system,
One foot topo lines between the level lip and top of stream bank,
' - Proposed drainage easement, and
- Design at ultimate build-out.
Tf uJ F ' °1 3. Section view of the level spreader (1" = 20' or larger) showing:
- Underdrain system (if applicable),
Level lip,
Upslope channel, and
' Downslope filter fabric.
Ut?4 4. A date-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.
' `C?1rW Ct?1lG 5 5. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
6. The supporting calculations.
TVW 7. A copy of the signed and notarized operation and maintenance (0&M) agreement.
N 14 8. A copy of the deed restrictions (if required).
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Part III, page 1 of 1
Level Spreader Supporting Calculations
Area - #12
Time of Concentration Calculations
Input
Length of Watershed 855 FT
iw?qht of W aFtemw 46 FT
Output _
Time of Concentration Minutes 5.00
10 Peak intens Uculations
Finding The 1Oyr, C T4 - 0.60 inches
t? reading attached thaft
d(inYtc min rnintt' 7.20 inches/hour
htflOw Calcutcrtio
eadc ns
Dn*YaP Areal ,
150,381 SF
3.45 Acres
Pro-development lrnpwyWVg „ Arw 0 SF 0.00 Acres
Post-dev l l 0 SF
0 0.00 Acres

ent irk
Pre-dev m
ISO

.00 /o

i
p i 0.00°10

0.30
Post dev Ruin-off Coefftcisnt C 0.30

R 1.0 in

ittt l
t0
twofall
yr.

7.20 in/hr

Peak kw 1 "l hr storr?r

'
Pire-dovOWrner?

;?
0 *A 7.46 ft /sec
oet * elopment 10-yr, P%* flow (Q)
es 7.46 ft /sec

fore tses
0.2% s'1f thM OM W ekr"Is . VaGe 0 SF

l
H = 3 0.10,

Bypass tlwal i Wier` Design
w*, Wingth 3 0.55'

Q=CIA C= 0.3
Hub Road
Diffuse Swale Calculations
Entrance Swale No. 12
1= 1
A= 3.45 010 = 1.04 CFS
channel calculator for bare earth swale
Given Input Data: Computed Results:
Shape ........................... Trapezoidal Depth ........................... 0.3454 ft
Solving for ..................... Depth of Flow Velocity ........................ 2.8768 fps
Flowrate ........................ 1.0400 cfs Full Flowrate ................ ... 17.7085 cfs
Slope ........................... 0.0167 ft/ft Flow area ..................... .. 0.3615 ft2
Manning's n ..................... 0.0200 Flow perimeter ............. ..... 2.2044 ft
Height .......................... 1.0000 ft Hydraulic radius ........... ..... 0.1640 ft
Bottom width .................... 0.0000 ft Top width ...................... . 2.0933 ft
Left slope ...................... 0.3300 ft/ft (V/H) Area ............................ 3.0303 ft2
Right slope ..................... 0.3300 ft/ft (V/H) Perimeter ...................... . 6.3821 ft
Percent full ................... . 34.5397%
channel calculator for permanent grass swale

Given Input Data: Computed Results:
Shape ........................... Trapezoidal Depth ........................... 0.4260 ft
Solving for ..................... Depth of Flow Velocity ........................ 1.8907 fps
Flowrate ........................ 1.0400 cfs Full Flowrate ................. .. 10.1192 cfs
Slope ........................... 0.0167 ft/ft Flow area ...................... . 0.5501 ft2
Manning's n ..................... 0.0350 Flow perimeter ............. ..... 2.7191 ft
Height .......................... 1.0000 ft Hydraulic radius ........... ..... 0.2023 ft
Bottom width .................... 0.0000 ft Top width ...................... . 2.5821 ft
Left slope ...................... 0.3300 ft/ft (V/H) Area ............................ 3.0303 ft2
Right slope ..................... 0.3300 ft/ft (V/H) Perimeter ...................... . 6.3821 ft
Percent full ................... . 42.6048%
Temporarv Liner Design
Permissible Unit Shear Stress, Td
T=yds Lining Tyae Ibs/ft.2
t= Shear Stress in Ibs/ft.2 straw w/ tack coat 0.35
y= Unit weight of water 62.4 Ibs/ft.3 S75 straw w/ net 1.55
d= Flow depth in ft. P300 polypropylene 3.00
s= Channel Gradient in ft./ft. P550 polypropylene 4.00
d50 Stone Size (inches)
d= 0.35 ft. 1 0.33
S= 0.02 ft./ft. 2 0.67
t= 0.36lb/ft.2 6 2
9 3
12 4
Lining Required: S75 Straw w/ Net 15 5
18 6
21 7.8
24 8

Hub Road
Diffuse Swale Calculations
' Bypass Swale No. 12
' Qto=CIA C= 0.3 1= 7.2 A= 3.45 Quo = 7.45 CFS
channel calculator for bare earth swale
' Given Input Data: Computed Results:
Shape ........................... Trapezoidal Depth ........................... 0.6749 ft
Solving for ..................... Depth of Flow Velocity ........................ 8.1890 fps
' Flowrate ........................ 7.4600 cfs Full Flowrate ................. .. 135.1609 cfs
9110 ft2
0
Slope ........................... 0.0600 ft/ft Flow area ..................... .
..
Manning's n ..................... 0.0200 Flow perimeter ............. ..... 3.0182 ft
Height .......................... 1.5000 ft Hydraulic radius ........... ..... 0.3018 ft
Bottom width .................... 0.0000 ft Top width ...................... . 2.6996 ft
Left slope ...................... 0.5000 ft/ft (V/H) Area ............................ 8.0000 ft2
Right slope ..................... 0.5000 ft/ft (V/H) Perimeter ...................... . 8.9443 ft
Percent full ................... . 33.7449%
channel calculator for permanent Srass swale
' Given Input Data: Computed Results:
Shape ........................... Trapezoidal Depth ........................... 0.8325 ft
Solving for ..................... Depth of Flow Velocity ........................ 5.3821 fps
' Flowrate ........................ 7.4600 cfs Full Flowrate ................. .. 77.2348 cfs
Slope ........................... 0.0600 ft/ft Flow area ..................... .. 1.3861 ft2
Manning's n ..................... 0.0350 Flow perimeter ............. ..... 3.7230 ft
Height .......................... 1.5000 ft Hydraulic radius ........... ..... 0.3723 ft
Bottom width .................... 0.0000 ft Top width ...................... . 3.3299 ft
Left slope ...................... 0.5000 ft/ft (V/H) Area ............................ 8.0000 ft2
Right slope ..................... 0.5000 ft/ft (V/H) Perimeter ..................... .. 8.9443 ft
' Percent full ................... . 41.6243%
Temporary Liner Design
' Permissible Unit Shear Stress, Td
T=yds Lining Type Ibs/ft.2
' t= Shear Stress in Ibs/ft.2 straw w/ tack coat 0.35
y= Unit weight of water 62.4 Ibs/ft.3 S75 straw w/ net 1.55
d= Flow depth in ft. P300 polypropylene 3.00
' s= Channel Gradient in ft./ft. P550 polypropylene 4.00
d50 Stone Size (inches)
d= 0.67 ft. 1 0.33
s= 0.06 ft./ft. 2 0.67
' t= 2.51 Ib/ft.2 6 2
9 3
12 4
' Lining Required: P300 Polypropylene 15 5
18 6
21 7.8
'
1 24 8
Permit Number:
(to be provided by DWQ)
Drainage Area Number.
Filter Strip, Restored Riparian Buffer and Level Spreader
Operation and Maintenance Agreement
I will keep a maintenance record on this BMP. This maintenance record will be kept in a
log in a known set location. Any deficient BMP elements noted in the inspection will be
corrected, repaired or replaced immediately. These deficiencies can affect the integrity
of structures, safety of the public, and the removal efficiency of the BMP.
Important maintenance procedures:
- Immediately after the filter strip is established, any newly planted vegetation
will be watered twice weekly if needed until the plants become established
(commonly six weeks).
- Once a year, the filter strip will be reseeded to maintain a dense growth of
vegetation
- Stable groundcover will be maintained in the drainage area to reduce the
sediment load to the vegetation.
- Two to three times a year, grass filter strips will be mowed and the clippings
harvested to promote the growth of thick vegetation with optimum pollutant
removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and
may be allowed to grow as tall as 12 inches depending on aesthetic requirements
(NIPC,1993). Forested filter strips do not require this type of maintenance.
- Once a year, the soil will be aerated if necessary.
- Once a year, soil pH will be tested and lime will be added if necessary.
After the filter strip is established, it will be inspected quarterly and within 24 hours
after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County).
Records of operation and maintenance will be kept in a known set location and will be
available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall
be repaired immediately.
BMP element: Potential problem: How I will remediate the problem:
The entire filter strip Trash/debris is present. Remove the trash/debris.
system
The flow splitter device The flow splitter device is Unclog the conveyance and dispose
(if applicable) clogged. of an sediment off-site.
The flow splitter device is Make any necessary repairs or
damaged. replace if damage is too large for
re air.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 1 of 3
BMP element: Potential problem: How I will remediate the problem:
The swale and the level The swale is clogged with Remove the sediment and dispose
lip sediment. of it off-site.
The level lip is cracked, Repair or replace lip.
settled, undercut, eroded or
otherwise damaged.
There is erosion around the Regrade the soil to create a berm
end of the level spreader that that is higher than the level lip, and
shows stormwater has then plant a ground cover and
bypassed it. water until it is established. Provide
lime and a one-time fertilizer
application.
Trees or shrubs have begun Remove them.
to grow on the swale or just
downslo of the level lip.
The bypass channel Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then
reestablish proper erosion control.
Turf reinforcement is Study the site to see if a larger
damaged or ripap is rolling bypass channel is needed (enlarge if
downhill. necessary). After this, reestablish
the erosion control material.
The filter strip Grass is too short or too long Maintain grass at a height of
if applicable). approximately three to six inches.
Areas of bare soil and/or Regrade the soil if necessary to
erosive gullies have formed. remove the gully, and then plant a
ground cover and water until it is
established. Provide lime and a
one-time fertilizer application.
Sediment is building up on Remove the sediment and
the filter strip. restabilize the soil with vegetation if
necessary. Provide lime and a one-
time fertilizer application.
Plants are desiccated. Provide additional irrigation and
fertilizer as needed.
Plants are dead, diseased or Determine the source of the
dying. problem: soils, hydrology, disease,
etc. Remedy the problem and
replace plants. Provide a one-time
fertilizer application.
Nuisance vegetation is Remove vegetation by hand if
choking out desirable species. possible. If pesticide is used, do not
allow it to get into the receiving
water.
The receiving water Erosion or other signs of Contact the NC Division of Water
damage have occurred at the Quality local Regional Office, or the
outlet. 401 Oversight Unit at 919-733-1786.
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 2 of 3
Permit Number:
(to be provided by DWQ)
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ of any
problems with the system or prior to any changes to the system or responsible party.
Project name:Triantzle North Franklin Industrial Park Access Road
BMP drainage area number:Level Spreaders No. 1.2/3.4/5, b. 7. 10. & 12
Print name:Timmy Baynes
Title:Executive Director - Triangle North
Note: The legally responsible party should not be a homeowners association unless more than 50% of
the lots have been sold and a resident of the subdivision has been named the president.
I, Gina A AR/? , a Notary Public for the State of
v e , County of an c.e. , do hereby certify that
/ rma
hl- a p-5 personally appeared before me this oZd
day of and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
?pTAR?- t
1
1 yy AVB1.?G
,COUt.
SEAL
My commission expires //- /1-5- 441U

Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 3
Address:PO Box 709. 1724 Graham Avenue Henderson NC 27536
Soil & Environmental Consultants, FA
11010 Raven Ridge Road • Raleigh, North Carolina 27614 • Phone: [phone] • Fax: (919) W9467
www.SandEC.com
April 9, 2010
Job # 11404.51
Kerr-Tar Regional Economic Development Corporation
Attn: Danny Wright
PO Box 709
Henderson, NC 27536
Re: Detailed Soils Evaluation Report for the proposed Bioretention Areas on
the Franklin County HUB Road Connection, Franklin County, NC
Dear Mr. Wright:
Soil & Environmental Consultants, PA (S&EC) has performed a detailed soils evaluation
in the proposed stormwater infiltration areas at the site mentioned above. A map
showing the location of the proposed stormwater infiltration areas was provided to us by
the client. At the indicated locations the following activities were performed: soil
morphology profile descriptions and estimations of the seasonal high water table. The
purpose of this evaluation was to provide you with additional information for designing a
stormwater infiltration device. The following is a brief report of the methods utilized in
this evaluation and the results obtained.
il/Site Evaluation
The evaluation was performed by advancing hand auger borings at seven locations which
were located with a GPS receiver and are shown on the attached map. S&EC identified
and recorded the soil morphological conditions at those locations in order to develop soil
profile descriptions, which are also included with this report and shown on the attached
maps.
Soil borings revealed a sandy loam surface material overlying a clay to clay loam
subsurface horizon. The seasonal high water table based on soil morphology in soil
boring locations 1-7 ranges between 36" and 40" in Bioretention area #1, 32" in
Bioretention area #2, 28" and 32" in Bioretention area 0, and 14" and 26" in
Bioretention area #4. Under current regulations, the bottom of any infiltration system
must be a minimum of two feet above the seasonal high water table.
Under current regulations an underdrain shall be installed if the in-situ soils have an
infiltration rate of less than 2 inches per hour. All seven soil borings had subsurface
horizons that have an estimated hydraulic conductivity of less than the 2 inches per hour
threshold. Although saturated hydraulic conductivity measurements would be needed to
definitively show that these layers are below the 2 inches per hour threshold, we feel
strongly that any testing will reveal that these soils will not meet the threshold. No actual
site specific testing of hydraulic conductivity was performed.
Soil & Environmental Consultants, PA is pleased to be of service in this matter and we
look forward to assisting in the successful completion of the project. Please feel free to
call with any questions or comments.
Sincerely,
Ricky Pontello
NC Licensed Soil Scientist #1232
GNMHIC SCRLE
1 •IP
ao iX 1W
DETAILED 500. BORING MAP.
SOIL BORING LOCATIONS WERE ESTABLISHED IN THE FIELD USING CPS RECEIVERS.
NOT A SURVEY.
NOT A SURVEY.
TOPOGRAPHIC INFORMATION, BUILDINGS. ROADS AND OTHER SITE FEATURE
INFORMATION WAS PROVIDED TO SIEC FROM THE CLIENT.
I ? ,.¢.I Vxaci-? I
-' FRANY.LIN COUNTY h1U5 ROAD CONI4ECTION FRANKLIN CO. Soil A Environment Consultants, PA
SOIL BORING MAP FRANKLIN CO?
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s`•
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T BORING #2 k?
l- BIORETENTION AREA # I
• BORING #
BORING #1 SHWT AT 36" FROM TOP OF GROUND
BORING #2 SHWT AT 40" FROM TOP OF GROUND
DETAILED SOIL BORING MAP.
SOIL BORING LOCATIONS WERE ESTABLISHED IN THE FIELD USING GPS RECEIVERS.
NOT A SURVEY.
GRAPHIC SCALE NOT A SURVEY.
ill _ 301 TOPOGRAPHIC INFORMATION, BUILDINGS, ROADS AND OTHER SITE FEATURE
INFORMATION WAS PROVIDED TO SBEC FROM THE CLIENT.
30 0 30 60

Pr erect. Pr sec: N o. 11404.5 ?
FRANKLIN COUNTY HUB ROAD CONNECTION

Soil A Environmental Consultants, PA
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SOIL BORING MAP I Of
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• BORING #
BORING #3 SHWT AT 32" FROM TOP OF GROUND
DETAILED SOIL BORING MAP.
SOIL BORING LOCATIONS WERE ESTABLISHED IN THE FIELD USING GPS RECEIVERS.
NOT A SURVEY.
GRAPHIC SCALE NOTASURVEY.
11. _ 30, TOPOGRAPHIC INFORMATION, BUILDINGS, ROADS AND OTHER SITE FEATURE
INFORMATION WAS PROVIDED TO SBEC FROM THE CLIENT.
30 0 30 60

N. 11404.51
FRANKLIN COUNTY MUB ROAD CONNECTION
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Soil & Environmental Consultants, PA oc t c-i s ne;e Won
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• BORING #

BORING #4 SHWT AT 28" FROM TOP OF GROUND
BORING #5 SHWT AT 32" FROM TOP OF GROUND
DETAILED SOIL BORING MAP.
SOIL BORING LOCATIONS WERE ESTABLISHED IN THE FIELD USING GPS RECEIVERS.
NOT A SURVEY.
GRAPHIC SCALE NOTA SURVEY.
1 " = 30' TOPOGRAPHIC INFORMATION, BUILDINGS, ROADS AND OTHER SITE FEATURE
INFORMATION WAS PROVIDED TO S&EC FROM THE CLIENT.
30 0 30 60
Project. P,,jee.. W i I40?.51
FRANKLIN COUNTY HUB ROAD CONNECTION r;- Dr:rr"
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Soil A Environmental Consultants, PA aaro C.- 5-me .e1E Work
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• BORING #
BORING #6 SHWT AT 26" FROM TOP OF GROUND
BORING #7 SHWT AT 14" FROM TOP OF GROUND
DETAILED SOIL BORING MAP.
SOIL BORING LOCATIONS WERE ESTABLISHED IN THE FIELD USING GPS RECEIVERS.
NOT A SURVEY.
GRAPHIC SCALE
1"=30'
30 0 30 60
NOT A SURVEY.
TOPOGRAPHIC INFORMATION, BUILDINGS, ROADS AND OTHER SITE FEATURE
INFORMATION WAS PROVIDED TO S&EC FROM THE CLIENT,
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FRANKLIN COUNTY HUB ROAD CONNECTION My; c' I D""'
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