20091109 Ver 1_Other Agency Comments_20091117

LEVEL SPREADER DESIGN
CALCULATIONS
NORTHSIDE LOOP WITH JUNIPER
ROAD REALIGNEMENT
WAKE FOREST, NC
-?MULKEY
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
Initial Sheet No.
R.tW1,1& -,Er 1. Plans (1" - 50' or larger) of the entire site showing:
AND - Design at ultimate build-out,
C-4LCJJL4 - Off-site drainage (if applicable),
PAC-r-4(06 - 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.
L5 ^001 2. Plan details (1" = 30' or larger) for the level spreader showing:
L5 -Do 2 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,
L5 -C02 3. Section view of the level spreader (1" = 20' or larger) showing:
Underdrain system (if applicable),
Level lip,
Upslope channel, and
Downslope filter fabric.
CAL-cuLAn E 4. A date-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.
oc 2 5. A construction sequence that shows how the level spreader will be protected from sediment until the entire
drainage area is stabilized.
CALcv4ATION 6. The supporting calculations.
C,4c4vc-417oN 7. A copy of the signed and notarized operation and maintenance (0&M) agreement.
AGKA6E
N /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
MULKEY
t oOp ENGINEERS 6 CONSULTANTS
• ; Nq J
TABLE OF CONTENTS
• DRAINAGE AREA MAP
• LEVEL SPREADER DESIGN FLOW RATE CALCULATIONS
• BYPASS STRUCTURE DESIGN CALCULATIONS
• BYPASS CHANNEL DESIGN
• DWQ LEVEL SPREADER SUPPLEMENTAL FORMS
• LEVEL SPREADER DESIGN SUMMARY& DETAILS
W e FILTER STRIP PHOTOGRAPHS
• OPERATION AND MAINTENANCE AGREEMENT
•
MULKEY INC. 6750 TRYON ROAD CARY, NO 2751 1 PO 8O% 33127 RALEIGH, NO 27636 PH: 919-851-1912 FAX: [phone] .W .NULKEYINC.COM
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= M U LKEY Calculation Sheet
ENGINEERS 6 CONSULTANTS
CLIENT SUBJECT BYPASS STRUCTURE A
PROJECT No.
Flow from first inch to Level Spreader (Q,..) = 2.19 cfs
Total Flow from System (Q,o) = 15.80 cfs
Flow to Bypass system (Q) = 13.61 cfs
HEADWATER DESIGN
Q=Cc' A ` (29H)o.5
Q= discharge (cfs)
• Co = coefficient of discharge (0.6 default value)
A = cross sectional area of orifice (ft)
g = acceleration of gravity (32.2 ft/sec2)
H = driving head (ft)
A= Tr } d2/4
A = cross sectional area of orifice
d = orifice diameter
d=' IT
A = 79" (in2)
A = 0.55 (ft2)
H = 0.70 (ft)
Q=Cc•A•(2gH)05= 2.22 (cfs)
•
Page OF
Prepared By _ Date _
Reveiewed By _ Date_
Values to be input by user
(assume a height to centroid of orifice)
& WEIR DESIGN
Q=Cw'L•H,s
Cw= coefficient of discharge (3.33 for sharp crested weir)
L = length of weir (solve for)
H = driving head (ft)
Cw= 3.33
L = 2.22 (ft)
H = 1.50 (ft)
Q = Cw' B ` H' 5 = 1t3f58 (cfs)
Say 2.25' for width
Use Standard 24" x 36" precast box
Minimum height of box (without lid)= 4.00

(assume a height of water over weir)
0
•? O M U LKEY Calculation Sheet Page _ OF
ENGINEERS 6 CONSULTANTS
CLIENT SUBJECT BYPASS STRUCTURE B_ Prepared By _ Date _
PROJECT No. Reveiewed By Date
Values to be input by user
Flow from first inch to Level Spreader (Q,•) = 2.75 cfs
Total Flow from System (Q,o) = 19.82 cfs
Flow to Bypass system (Q) = 17.07 cfs
HEADWATER DESIGN
Q=Cp • A • (29H)os
Q = discharge (cfs)
CD= coefficient of,discharge (0.6 default value)
• A = cross sectional area of orifice (ft)
g = acceleration of gravity (32.2 fUsec2)
H = driving head (ft)
A= n' d2/4
A = cross sectional area of orifice
d = orifice diameter
d = 10"
A = 79" (in2)
A = 0.55 (ft)
H = 1.10 (ft)
Q=Co.A.(2gH)oe= 2 78' ` (cfs)
(assume a height to centroid of orifice)
is
•) WEIR DESIGN
Q=Cw- L•Hvs
Cw= coefficient of discharge (3.33 for sharp crested weir)
L = length of weir (solve for)
H = driving head (ft)
C„,= 3.33
L = 2.79 (ft)
H = 1.50 (ft)
Q = Cw . B . H1.s = < _:.17.07_.: =; (cfs)
Say 2.75' for width
Use Standard 24" x 36" precast box
Minimum height of box (without lid)= 4.00
•
(assume a height of water over weir)
0
•? ? M U LK EY Calculation Sheet Page OF
ENGINEERS S CONSULTANTS
CLIENT SUBJECT BYPASS STRUCTURE C_ Prepared By _ Date
PROJECT No. Reveiewed By Date_
Values to be input by user
Flow from first inch to Level Spreader (Q,..) = 2.71 cfs
Total Flow from System (Q10) = 19.60 cfs
Flow to Bypass system (Q) = 16.89 cfs
HEADWATER DESIGN
Q=Co+A. (2gH)o.e
Q = discharge (cfs)
Co = coefficient of discharge (0.6 default value)
• A = cross sectional area of orifice (ft)
g = acceleration of gravity (32.2 fUseCZ)
H = driving head (ft)
A= n ' d2/4
A = cross sectional area of orifice
d = orifice diameter
d = 10"
A = 79" (ins)
A = 0.55 (ft)
H = 1.05 (ft)
Q=Co•A=(2gH)o5= jjj2.71 (cfs)
(assume a height to centroid of orifice)
0
0)
WEIR DESIGN
Q=Cw'L.H15
Cw= coefficient of discharge (3.33 for sharp crested weir)
L = length of weir (solve for)
H = driving head (ft)
Cw= 3.33

L = 2.76 (ft)
H = 1.50 (ft)
Q = Cw - B - H'5=1116.88 (cfs)
Say 2.25' for width
Use Standard 24" x 36" precast box
Minimum height of box (without lid)= 4.00
BYPASS BOX DESIGN INFO
Invert of Bypass Box & Orifice = 342.50
Centroid Elevation = 342.92
Weir Elevation = Centroid Elev + Driving Head 343.97
Width of Weir = 2.76
Height of Box = 2.97
(assume a height of water over weir)
is
4-MULKEY Calculation Sheet
ENGINEERS 6 CONSULTANTS
CLIENT SUBJECT BYPASS STRUCTURE D_
PROJECT No.
Flow from first inch to Level Spreader (Q,•) =
Total Flow from System (Q10) =
Flow to Bypass system (Q) _
HEADWATER DESIGN
Q=CD * A * (29H)0.5
Q= discharge (cfs)
1.81 cfs
13.05 cfs
11.24 cfs
CD = coefficient of discharge (0.6 default value)
• A = cross sectional area of orifice (ft)
g = acceleration of gravity (32.2 ft/sec2)
H = driving head (ft)
A=Tr*d214
A = cross sectional area of orifice
d = orifice diameter
A = 50" (in2)
A = 0.35 (ft2)
H = 1.15 (ft)
Q=CD•A•(2gH)05= 1.81 (cfs)
d = 8"
Page - OF
Prepared By Date _
_ Reveiewed By _ Date_
Values to be input by user
(assume a height to centroid of orifice)
0
WEIR DESIGN
Q=Cw.L.Hi.5
Cw= coefficient of discharge (3.33 for sharp crested weir)
L = length of weir (solve for)
H = driving head (ft)
Cw = 3.33
L = 1.84 (ft)
H = 1.50 (ft)
Q = Cw " B ` H' S - 11.26 (cfs)
Say 1.75' for width
Use Standard 24" x 36" precast box
Minimum height of box (without lid)= 4.00
•
(assume a height of water over weir)
C J
O M U LK E Y Calculation Sheet Page _ OF
ENGINEERS 6 CONSULTANTS
CLIENT SUBJECT BYPASS STRUCTURE E_ Prepared By Date
PROJECT No. Reveiewed By _ Date_
Values to be input by user
Flow from first inch to Level Spreader (Q1.) = 4.54 cfs
Total Flow from System (Q10) = 32.77 cfs
Flow to Bypass system (Q) = 28.23 cfs
HEADWATER DESIGN

Q=Cc' A • (29H)O'
Q = discharge (cfs)
Cc = coefficient of discharge (0.6 default value)
A = cross sectional area of orifice (ft)
g = acceleration of gravity (32.2 fUsec2)
H = driving head (ft)
A= Tr ' d 2 A
A = cross sectional area of orifice
d = orifice diameter
d12"
A = 113" (in2)
A = 0.79 (ft2)
H = 1.45 (ft)
Q=Cp•A•(2gH)05= 4.58 _ (cfs)
(assume a height to centroid of orifice)
C?
V WEIR DESIGN
Q=Cw.L.Hi.s
Cw= coefficient of discharge (3.33 for sharp crested weir)
L = length of weir (solve for)
H = driving head (ft)
Cw= 3.33
L = 4.61 (ft)
H = 1.50 ' (ft)
Q=Cw.B.H15=:` 28x20;'-,(cfs)
Say 1.50' for width
Use Standard 24" x 36" precast box
Minimum height of box (without lid)= 4.00
•
(assume a height of water over weir)

0
•r ? Calculation Sheet Page OF
ENGINEERS S CONSULTANTS
CLIENT SUBJECT BYPASS STRUCTURE F_ Prepared By Date _
PROJECT No. Reveiewed By Date_
Values to be input by user
Flow from first inch to Level Spreader (Q,•) = 1.83 cfs
Total Flow from System (Q10) = 13.23 cfs
Flow to Bypass system (Q) = 11.40 cfs
HEADWATER DESIGN
Q=CD' A' (2gH)0 .5
Q= discharge (cfs)
CD = coefficient of discharge (0.6 default value)
• A = cross sectional area of orifice (ftz)
g = acceleration of gravity (32.2 fUsec2)
H = driving head (ft)
A= Tr ' d2/4
A = cross sectional area of orifice
d = orifice diameter
d = 8"
A = 50" (in2)
A = 0.35 (fe)
H = 1.20 (ff)
Q=CD'A'(2gH)o5 = 1 85±': i (cfs)
(assume a height to centroid of orifice)
u
0 WEIR DESIGN
Q=Cw.L.Hi.e
Cw= coefficient of discharge (3.33 for sharp crested weir)
L = length of weir (solve for)
H = driving head (ft)
CV,= 3.33
L = 1.86 (ft)
H = 1.50 (ft) (assume a height of water over weir)
Q = Cw - B * H1.5 11.38 (cfs)
•
Say 2.00' for width
Use Standard 24" x 36" precast box
Minimum height of box (without lid)= 4.00
is
•/ ? M U LKEY Calculation Sheet
ENGINEERS& CONSULTANTS
CLIENT SUBJECT BYPASS STRUCTURE H_
PROJECT No.
Flow from first inch to Level Spreader (Q,..) = 1.19 cfs
Total Flow from System (Q,o) = 8.56 cfs
Flow to Bypass system (Q) = 7.37 cfs
HEADWATER DESIGN
•
Q=Co A'(2gH)o.5
Q=Cc' A • (29H)o5
Q= discharge (cfs)
CD = coefficient of discharge (0.6 default value)
A = cross sectional area of orifice (ft)
g = acceleration of gravity (32.2 fUsec2)
H = driving head (ft)
A= Tr ` d2/4
A = cross sectional area of orifice
d = orifice diameter
d = 6"
A = 28"
A = 0.20
H = 1.50
(in2)
(ft)
(ft)
(cfs)
Page _ OF
Prepared By Date
_ Reveiewed By Date
Values to be input by user
(assume a height to centroid of orifice)
0
& WEIR DESIGN
Q=Cw•L•H"
Cw = coefficient of discharge (3.33 for sharp crested weir)
L = length of weir (solve for)
H = driving head (ft)
Cw= 3.33
L= 1.2 (ft)
H = 1.50 (ft) (assume a height of water over weir)
Q = Cw « B* H1'5=7.34 (cfs)
•
Say 2.00' for width
Use Standard 24" x 36" precast box
Minimum height of box (without lid)= 4.00
•
Channel Report
0) BYPASS CHANNEL A (NORTHSIDE LOOP)
Trapezoidal
Bottom Width (ft) = 1.50
Side Slopes (z:1) = 3.00, 3.00
Total Depth (ft) = 2.00
Invert Elev (ft) = 310.00
Slope (%) = 5.71
N-Value = 0.200
Calculations
Compute by: Known Q
Known Q (cfs) = 13.65
Tuesday, Nov 10 2009
Highlighted
Depth (ft) = 1.49
Q (cfs) = 13.65
Area (sqft) = 8.90
Velocity (ft/s) = 1.53
Wetted Perim (ft) = 10.92
Crit Depth, Yc (ft) = 0.84
Top Width (ft) = 10.44
EGL (ft) = 1.53
(ft) Section
0
2 4 6
8 10
Reach (ft)
12 14 16
18
Depth (ft)
3.00
2.50
2.00
1.50
1.00
0.50
0.00
-0.50
Channel Report
•1BYPASS CHANNEL B (NORTHSIDE LOOP)
Trapezoidal
Bottom Width (ft)
Side Slopes (z:1)
Total Depth (ft)
Invert Elev (ft)
Slope (%)
N-Value
2.00
3.00, 3.00
2.00
348.00
6.67
0.200
Calculations
Compute by: Known Q
Known Q (cfs) = 13.61
Highlighted
Tuesday, Nov 10 2009
Depth (ft) = 1.37
Q (cfs) = 13.61
Area (sqft) = 8.37
Velocity (ft/s) = 1.63
Wetted Perim (ft) = 10.66
Crit Depth, Yc (ft) = 0.78
Top Width (ft) = 10.22
EGL (ft) = 1.41
(ft) Section Depth (ft)
3.00
2.50
2.00
1.50
1.00
0.50
0.00
0 50
2 4 6
8 10 12 14
Reach (ft)
16 18
Channel Report
Hydraflow Express Extension for AutoCAD® Civil 3D® 2008 by Autodesk, Inc.
.)
BYPASS CHANNEL C (NORTHSIDE LOOP)
Trapezoidal
Bottom Width (ft) = 3.00
Side Slopes (z:1) = 3.00, 3.00
Total Depth (ft) = 2.00
Invert Elev (ft) = 342.50
Slope (%) = 4.70
N-Value = 0.200
Calculations
Compute by: Known Q
Known Q (cfs) = 16.93
.Elev (ft) Section
x5.00
344.50
344.00
343.50
343.00
342.50
4P42.00
Wednesday, Nov 11 2009
Highlighted
Depth (ft) = 1.51
Q (cfs) = 16.93
Area (sqft) = 11.37
Velocity (ft/s) = 1.49
Wetted Perim (ft) = 12.55
Crit Depth, Yc (ft) = 0.77
Top Width (ft) = 12.06
EGL (ft) = 1.54
2 4 6 8 10 12 14 16 18 2
Reach (ft)
Depth (ft)
2.50
2.00
1.50
1.00
0.50
0.00
-0.50
Channel Report
BYPASS CHANNEL D (NORTHSIDE LOOP)
Trapezoidal
Bottom Width (ft)
Side Slopes (z:1)
Total Depth (ft)
Invert Elev (ft)
Slope (%)
N-Value
1.00
3.00, 3.00
2.00
352.00
6.00
0.200
Calculations
Compute by: Known Q
Known Q (cfs) = 11.41
Tuesday, Nov 10 2009
Highlighted
Depth (ft) = 1.44
Q (cfs) = 11.41
Area (sqft) = 7.66
Velocity (ft/s) = 1.49
Wetted Perim (ft) = 10.11
Crit Depth, Yc (ft) = 0.83
Top Width (ft) = 9.64
EGL (ft) = 1.47
Elev (ft) Section
•i5.00
354.50
354.00
353.50
353.00
352.50
352.00
•
351.50
I 2 4 6 8 10
Reach (ft)
Depth (ft)
3.00
2.50
2.00
1.50
1.00
0.50
0.00
_n Fn
12 14 16 18
Channel Report
Hydraflow Express Extension for AutoCADV Civil 3D® 2008 by Autodesk, Inc.
W Tuesday, Nov 10 2009
BYPASS CHANNEL E (NORTHSIDE LOOP & G ILCHREST FARM ROAD)
Trapezoidal Highlighted
Bottom Width (ft) = 2.50 Depth (ft) = 1.74
Side Slopes (z:1) = 3.00, 3.00 Q (cfs) = 23.90
Total Depth (ft) = 2.25 Area (sqft) = 13.43
Invert Elev (ft) = 332.00 Velocity (fUs) = 1.78
Slope (%) = 5.88 Wetted Perim (ft) = 13.50
N-Value = 0.200 Crit Depth, Yc (ft) = 0.98
Top Width (ft) = 12.94
Calculations EGL (ft) = 1.79
Compute by: Known Q
Known Q (cfs) = 23.90
Elev (ft) Section
*5.00
334.50
334.00
333.50
333.00
332.50
332.00
1.50
0 2 4 6 8
10
Reach (ft)
Depth (ft)
3.00
2.50
2.00
1.50
1.00
0.50
0.00
n cn
12 14 16 18 20 - --
Channel Report
Hydraflow Express Extension for AutoCAD® Civil 3D® 2008 by Autodesk, Inc.
&
BYPASS CHANNEL F (NORTHSIDE LOOP)
Trapezoidal
Bottom Width (ft) = 1.00
Side Slopes (z:1) = 3.00, 3.00
Total Depth (ft) = 2.00
Invert Elev (ft) = 336.50
Slope (%) = 5.50
N-Value = 0.200
Calculations
Compute by: Known Q
Known Q (cfs) = 11.41
Wednesday, Nov 11 2009
Highlighted
Depth (ft) = 1.46
Q (cfs) = 11.41
Area (sqft) = 7.85
Velocity (ft/s) = 1.45
Wetted Perim (ft) = 10.23
Crit Depth, Yc (ft) = 0.83
Top Width (ft) = 9.76
EGL (ft) = 1.49
Elev (ft) Section
09.00
338.50
338.00
337.50
337.00
336.50
196.00
Depth (ft)
2.50
2.00
1.50
1.00
0.50
0.00
0 50
2 4 6 8 10
Reach (ft)
12 14 16
18
Channel Report
.)BYPASS CHANNEL H (JUNIPER AVE)
Trapezoidal
Bottom Width (ft)
Side Slopes (z:1)
Total Depth (ft)
Invert Elev (ft)
Slope (%)
N-Value
1.00
3.00, 3.00
2.00
355.00
5.83
0.200
Calculations
Compute by: Known Q
Known Q (cfs) = 7.36
Wednesday, Nov 11 2009
Highlighted
Depth (ft) = 1.20
Q (cfs) = 7.360
Area (sqft) = 5.52
Velocity (ft/s) = 1.33
Wetted Perim (ft) = 8.59
Crit Depth, Yc (ft) = 0.68
Top Width (ft) = 8.20
EGL (ft) = 1.23
Elev (ft) Section
0)8.00
357.50
357.00
356.50
356.00
355.50
355.00
•
QFd Fn
2 4 6 8 10 12 14 16
Reach (ft)
18
Depth (ft)
3.00
2.50
2.00
1.50
1.00
0.50
0.00
-0.50
®Y? ?Of WArFq `
y Or
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
l% PROJECT INFORMATION;
Project name NORTHSIDE LOOP WITH JUNIPER ROAD REALIGNMENT
Contact name MICHAEL ALLEN
Phone number 919-858-1888
Date -November 10, 2009
Drainage area number DRAINAGE AREA A (NORTHS(DE LOOP)
Type of BMP
Drawdown flow from the BMP
From a BMP
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area 149,276.00 fiz
Impervious surface area 71,930.00 ftz
Percent impervious 48.19 %
Rational C coefficient 0.64
Peak flow from the 1 in/hr storm 2.19 cfs
Time of concentration 5.00 min
Rainfall intensity, 10-yrstorm
• Peak flow from the 10-yr storm 7,22 in/hr
15.84 cfs
Where Does the Level Spreader Discharge?
To a grassed biorelention cell? N (Y or N)
To a mulched bioretention cell? N (Y or N)
To a wegand? N (Y or N)
To a filter strip or riparian buffer? Y (Y or N) Please complete filter strip characterization bdmv.
Other (specify)
Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass 30.00 It
Width of dense ground cover 0.00 ft
Width of wooded vegetation 0.00 ft
Total width 30.00 ft
Elevation at downslope base of level lip 310.00 fmsl
Elevation at top of bank of the receiving water 308.00 fmsl
Slope (from level lip to to top of bank) 6.67 %
Are any draws present? N (Y or N) OK
Level Spreader Design
Forebay surface area 145.00 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)
,"esign flow 2.19 cfs
1 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 or 2
Length of the level lip
Are level spreaders in series?
Bypass Channel Design (if applicable)
1 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
30.00 ft Level spreader length OK.
N (Y or N)
N (Y or N)
Y (Y or N)
3.00 ft
1.50 ft
13.50 ft
2.00 ft
1.49 cfs
'URF REINF. BY NORTH AMI

M
\J
•
4
B

M
Form SW401-Level Spreader, Fitter Strip, Restored Riparian Buffer-Rev.5 Parts 1. and II. Design Summary, page 2 or 2
?? 2?F WATEgo_
O G
NCDENR y
•? 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 name
Contact name
Phone number
Dale
Drainage area number
Type of BMP
Drawdown flow from the BMP
Flow From a BMP
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 cis
Answer "Y" to one of the following:
Length based on the 1 inlhr storm?
Length based on the 10-yr storm?
Length based on the BMP discharge rate?
0s s esign flow
a bypass device provided?
NORTHSIDE LOOP WITH
MICHAEL ALLEN
919-8b8-1888
Noyemoer 1 u, 2u u9
DRAINAGE AREA S (NORTHSIDE LOOP)
181,050.00 hP
94,515.00 ftz
52.20 %
0.66
2.74 cis
5.00 min
7.22in/hr
19.81 ds
N (Y or N)
N (Y or N)
N (Y or N)
Y (Y or N) Please complete filter stdp characterization below.
30.00 it
0.00 ft
0.00 it
30.00 it
348.00 fmsl
347.00 fmsl
3.33 % OK
N (Y or N) OK
189.00 sq it OK
13 fads
Y (Y or N)
N (Y or N)
N (Y or N)
2.74 cfs
Y (Y or N) OK
Fonn SW401-1-evel 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

36.00 ft Level spreader length OK.
N (Y or N)
N (Y or N)
Y (Y or N)
3.00 ft
2.00 ft
14.00 ft
2.00 ft
1.53 cfs
'URF REINF. BY NORTH AMI
1 - --------- y
M
l B 1
is
is

M
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Parts 1. and II. Design Summary, page 2 of 2
®?? 2?F WAiFgO
9
•l WDENR r
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 name
Contact name
Phone number
Date
Drainage area number
NORTHSIDE LOOP WITH
MIUMAEL ALLEN
519.858-1888
November 10,
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 164,455.00 ff
Impervious surface area 101,600.00 fl
Percent impervious 61.78 %
Rational C coefficient 0.72
Peak flow from the 1 in/hr storm 2.72 cis
Time of concentration 5.00 min
Rainfall intensity, 10-yr storm
•Peak flow from theI0-yrstorm 722 in/hr
19
63 cis
.
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)
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 cis
Answer 'Y" to one of the following:
Length based on the 1 in1hr storm?
Length based on the 10-yr storm?
Length based on the BMP discharge rate?
1esbn flow
a bypass device provided?
30.00 It
0.00 it
0.00 It
30.00 It
342.50 fmsl
341.00 fmsl
Please complete filter strip characterization below.
5.00 % OK
N (Y or N) OK
203.00 sq ft OK
13 Pods
Y (Y or N)
N (Y or N)
N (Y or N)
2.72 cis
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

M
•
rI
L
36.00 ft Level spreader length OK.
N (Y or N)
N (Y or N)
Y (Y or N)
3.00 ft
3.00 ft
15.00 It
2.00 ft
1.49 cis
URF REINF. BY NORTH AMI
B
i
M
4
Farm SW401-Level Spreader, Fitter Strip, Restored Riparian Buffer-Rev.S Parts I. and II. Design Summary, page 2 of 2
A W 2o,WATE9o
?? y s
• WDENR
j ST0RNIWATER 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 (NE)CT WORKSHEET)I
-,rolect name
Contact name
Phone number
Date
Drainage area number
LOOP WITH
ALLtN
9-858-1888
November 10, 2009
DRAINAGE AREA D (NORTHSIDE LOOP)
II. DESIGN INFORMATION
For Level Spreaders Receiving Flow From a BMP
Type of BMP
Drawdown flow from the BMP
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area 114,094.00 ft2
Impervious surface area 66,902.00 ft2
Percent impervious 58.64 %
Rational C coefficient 0.69
Peak flow from theIin/hr storm 1.81 cis
Time of concentration 5.00 min
Rainfall intensity, 10-yr storm
• Peak flow from the 10-yr storm 7.22 in/hr
13.05 cis
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)
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 cis
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?
esign flow
a bypass device provided?
Please complete filter strip chansdenzation below.
30.00 ft
0.00 ft
0.00 it
30.00 it
352.00 fmsl
351.00 fmsl
3.33 % OK
N (Y or N) OK
134.00 sq ft OK
.13 ft/cfs
Y (Y or N)
N (Y or N)
N (Y or N)
1.81 cis
Y (Y or N) ON
Form SW401-Level Spreader, Filter Strip, Restored Ripadan Buffer-Rev.S 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

M
•
•
24.00 ft Level spreader length OK.
N (Y or N)
N (Y or N)
Y (Y or N)
3.00 It
1.00 ft
13.00 ft
2.00 It
1.49 cfs
'URF REINF. BY NORTH AMI
j B 4
M
1
Fonn SW401-Level Spreader, Fiaer Strip, Restored Riparian Buffer-Rev.5 Parts I. and II. Design Summary, page 2 of 2
®ITA 20f W^a TEgl\O
O?L _.. \G
NCDENR ° Lry?rCyIJ-C y
•? 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
I. PROJECT INFORMATION
Poled name NORTHSIDE LOOP WITH JUNIPER ROAD REALIGNMENT
Contact name MICHAEL ALLEN
Phone number 919-858-1888
Date November 10, 2009
Drainage area number DRAINAGE AREA E (NORTHSIDE LOOP & GILCHREST FARM ROAD)
Ill. DESIGN INFORMATION
For Level Spreaders Receiving Flow From a BMP
Type of BMP
Drawdown flow from the BMP - ds
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, l0-yr storm
• Peak flow from the 10-yr storm
Where Does the Level Spreader Discharge?
To a grassed biorelention 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?
274,612.00 h'
170,957.00 f 2
62.25 %
0.72
4.54 cfs
5.00 min
7.22 inmr
32.77 cfs
N (Y or N)
N (Y or N)
N (Y or N)
Y (Yor N) Please complete filter step characterization belay.
30.00
It
It
ft
fmsl
Level Spreader Design
Forebay surface area
Feel of level lip needed per ds
Answer 'Y' to one of the following:
Length based on the 1 inthr storm?
Length based on the 10-yr storm?
Length based on the BMP discharge rate?
esign flow
s a bypass device provided?
3.33 % OK
N (Y or N) OK
342.00 sq ft OK
13 fVds
Y . (Y or N)
N (Y or N)
N (Y or N)
4.54 cis
Y (Y or N) OK
Form SW401-Level Spreader, Fiher Strip, Restored Riparian Buffer-Rev.5 Parts I. and H. 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):
B
W
Peak velocity in the channel during the 10-yr storm
Channel lining material
•
•
60.00 ft Level spreader length OK.
N (Y or N)
N (Y or N)
Y (Y or N)
3.00 fl
2.50 ft
16.00 ft
2.25 ft
1.78 cfs
'URF REINF. BY NORTH AMI
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Parts I, and II. Design Summary, page 2 of 2
AVA ?Q4 WATEgOL
NCDENR C
•? 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
Contact name
Phone number
Date
Drainage area number
NORTHSIDE LOOP WITH JUNIPER ROAD REALIGNMENT
MICHAEL ALLEN
919-858-1888
November 10, 2009
DRAINAGE AREA F (NORTHSIDE LOOP)
II. DESIGN INFORMATION
For Level Spreaders Receiving Flow From a BMP
Type of BMP
Drawdown flow from the BMP
For Level Spreaders Receiving Flow from the Drainage Area
Drainage area 135,308.00 f 2
Impervious surface area 54,143.00 ft'
Percent impervious 40.01 % -
Rational C coefficient 0.59
Peak flow from the 1 in/hr storm 1.83 ds
Time of concentraflon 5.00 min
Rainfall intensity, 10-yrstorm
• Peak flow from the 10-yr storm 722 in/hr
13
23 ds
.
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 wmplete filter step characterization below.
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 lop of bank)
Are any draws present?
Level Spreader Design
Forebay surface area
Feet of level lip needed per cis
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?
by flow
a
a bypass device provided?
30.00 ft
0.00 ft
0.00 ft
30.00 it
337.00 fmsl
336.00 fmsl
3.33 % OK
N (Y or N) OK
108.00 sq it OK
13 ft/cfs
Y (Y or N)
N (Y or N)
N (Y or N)
1.83 ds
Y (Y or N) OK
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Pans I. and II. Design Summary, page 1 of 2
Length of the level lip
Are level spreaders in series?
• Bypass Channel Design (if applicable)
1 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
Y
•
L]
24.00 ft Level spreader length OK
N (Y or N)
N (Y or N)
Y (Y or N)
3.00 ft
1.00 It
13.00 ft
2.00 it
1.45 cis
URF REINF. BY NORTH AMI
1
1 ---------- y
M
1 B 1
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5
i
M
Parts I. and II. Design Summary, page 2 of 2
®n =af WATESO
o? y
•) 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 REMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)I
I. PROJECT INFORMATION "
Project name NORTHSIDE LOOP WITH JUNIPER ROAD REALIGNMENT
Contact name MICHAEL ALLEN
Phone number 919.858-1888
Date
Drainage area number
iuuv

Ill. 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 79,487.00 it'
Impervious surface area 39,202.00 ff2
Percent impervious 49.32 %
Rational C coefficient 0.65
Peak flow from the 1 in/hr storm 1.19 cis
Time of concentration 5.00 min
Rainfall intensity, 10-yr storm 7.22 in/hr
• Peak flow from the 10-yr storm 8.56 cis
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)
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 lop of bank)
Are any draws present?
Level Spreader Design
Forebay surface area
Feet of level lip needed per cis
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?
ieaiby plow
a bypass device provided?
Please complete filter step characterization below.
40.00 it
0.00 ft
80.00 it
120.00 it
355.00 fmsl
348.00 fmsl
5.83 % OK
N (Y or N) OK
78.00 sq ft OK
48 h/ds
Y (Y or N)
N (Y or N)
N (Y or N)
1.19 cis
Y (Y or N) OK
Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5 Pans I. and II. Design Summary, page 1 of 2
III Length of the level lip
Are level spreaders in series?
• Bypass Channel Design (if applicable)
1 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

58.00 ft Level spreader length OK
N (Y or N)
N (Y or N)
Y (Y or N)
3.00 ft
1.00 ft
13.00 ft
2.00 ft
1.33 cfs
URF REINF. BY NORTH AM[

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

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LOCATION: SECTION:
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1. REINFORCEMENT: H-20 BRIDGE LOADING (TRAFFIC RATED)
2. CONCRETE: 4000 PSI @28 DAYS
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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 rernediate the problem:
The entire filter strip Trash/debris is present. Remove the trash/debris.
system
The flow splitter device The flow sputter 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
repair.
•
Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page l 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 a 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 I 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:
Ito 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: Northside Loop with Juniper Road Realignment
BMP drainage area number:A, B, C, D, E, F, G, H
Print name: Eric Keravuori
Title: Wake Forest Town EnIZineer
Address: 401 Elm Avenue Wake Forest, NC 27587
Signature:
Date: 1 I J5109
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.
O , a Notary Public for the State of
?t` 1 ?i Y1R. ount f "Vi d t- , do hereby certify that
E C44 e- rowy o ri personally appeared before me this 13'M
day of , cApOq , and acknowledge the due execution of the
forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements.
Witness my hand and official seal,
?1Y R,
14 0 T,q?? °v
1
SEAL
My commission expires 1d -0 1 " -W I L
E
Form SWU401-Lcvel Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 3

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