SW5210702_Previously Approved Stormwater Management Plan_20210930

STORMWATER MANAGEMENT PLAN
CALCULATIONS & APPENDICIES
Louisburg Plaza
Louisburg, North Carolina
Owner & Developer:
Louisburg Plaza, LLC
14600 Weston Pkwy.
Cary, North Carolina 27519
[phone]
O'Brien & Gere Project No. 12063:39505
November, 2006
Revised April 2007
Revised May 2007
2610 Wycliff Road, Suite 104
Raleigh, North Carolina 27607
Phone [phone] Fax [phone]

TABLE OF CONTENTS
Shallow Wetland No. 1
Drainage Area Analysis SW No. 1
I
Calculations
2 thni 20
Soils
2
Runoff
3
SA/DA
4
Permanent Pool Surface Area
4 thm 5
Temporary Pool Volume/Surface Area
5
Outlet Device
5
Emergency By -Pass (Overflow Weir)
5
Wetland Features Areas
6
Contour Areas
7
50 Year Storm Routing
8 thra 17
Discharge Piping
18 thm 19
Stilling Basin
20
Shallow Wetland No. 2
Drainage Area Analysis SW No. 2
21
Calculations
22 thm 41
Soils
22
Runoff
23
SA/DA
24
Permanent Pool Surface Area
24 tluu 26
Temporary Pool Volume/Surface Area
26
Outlet Device
26
Emergency By -Pass (Overflow Weir)
26
Wetland Features Areas
27
Contour Areas
28
50 year Storm Routing
29 thni 38
Discharge Piping
39 thm 40
Outlet Protection
41

Pocket Wetland No. 1
Calculations
42 thou 56
Runoff
42
SA/DA
43
Permanent Pool Surface Area
43 thou 44
Temporary Pool Volume/Surface Area
44
Outlet Device
44
Emergency By -Pass (Overflow Weir)
44
Wetland Features Areas
45
Contour Areas
46
50 year Storm Routing
47 thru 56
Pocket Wetland No. 2
Calculations
57 thru
Runoff
57
SA/DA
58 thru 59
Permanent Pool Surface Area
59
Temporary Pool Volume/Surface Area
59
Outlet Device
59
Emergency By -Pass (Overflow Weir)
59
Wetland Features Areas
60
Contour Areas
61
50 year Storm Routing
62 thru 71
Pocket Wetlands No. 1 & No. 2
Calculations
Diversion Structure/Inlet & Bypass Outlet
72
Diversion Structure/Level Spreader Inlet Piping
73
Diversion Structure/Overflow Weir
73
Level Spreader Forebay
74
Level Spreader Length (PW No. 1)
75
Level Spreader Length (PW No. 2)
76
Level Spreader Plan Detail
77
Level Spreader Bypass Swale
78 thru 79

Drawings (Separate)
Appendices
Cover Sheet
Boundary & Topographic Survey (Existing Conditions)
Grading and Drainage Plan
Stormwater Control Devices
Plans, Sections, Details and Planting Plan
Appendix A Soils Information
Appendix B Worksheets
Appendix C Operation and Maintenance Agreements
SW-1
SW-2, SW-3
SW-4 thm SW-7

Draina e Area Analysis Shallow Wetland No. 1 Basin
Drainage Area No.
Impervious
Lawn/Landscape
Total Area
Composite C factor
1
2.04
0.13
2.17
0.86
2
1.05
0.16
1.21
0.80
3
1.76
0.17
1.93
0.83
4
2.29
0.07
2.36
0.88
5
1.03
2.89
3.92
0.35
6
0.72
0.11
0.83
0.80
7
1.98
0
1.98
0.90
8
1.45
0
1.45
0.90
9
0.15
0
0.15
0.90
10
0.79
0.04
0.83
0.86
11
0.84
0
0.84
0.90
12
0.37
0.02
0.39
0.86
13
0.2
0.02
0.22
0.83
14
0
5.98
5.98
0.15
Total
14.67
9.59
24.26
0.60

O'BRIEN 5 GERE
SUBJECT
SHEET
BY
DATE
JOB NO.
F�bJ. /IIi710-I
24.Z1,
W e. �,�/ G•1!-c d ,C. �Ga ��'`.Ac'.'�.
y F:
.mac>1� �u:•�__,,�,.:, �_ �_�
t-1 =1 u
G 1J ' Co
J = Co 0
IoTPL
Table 1— Partial listing of SCS Curve Numbers in Urban,Areas
(taken from USDA — SCS, 1986)
Land Use
Soil
Soil
Soil
Soil
Grou A
Grou B
Group C
Group D
Paved Parking Lots Roofs
98
98
98
98
Paved Roads with Curb & Gutter
98
98
98
98
Paved Roads with o en ditches
83
89
92
93
Gravel Roads(including right-of-way)
76
85
89
91
Paved Roads(including right-of-wayl
74
84
90
92
Commercial and Business District
89
92
94
95
85%impervious)
Industrial District 72%Impervious)
81
88
91
93
Townhouses 1/8 acre lot
77
85
90
92
Residential Lot 1/4 acre
61
75
83
87
Residential Lot 1/2 acre
54
70
80
85
Residential Lot 1 acre
51
68
79
84
Residential Lot 2 acres
46
65
77
82
Open Space (Golf courses, lawns, Parks,
68
79
86
89
cemeteries)withs cover < 50%
Open Space with s cover 50% to 75%
49
69
79
en S ce with s cover > 75%
39
61
74
TO
Woods in Fair H drolo is Condition
3673
R 59
c._ �i�r T ��r. !'1 tr C. • �� = 1 Z �� �r >'- <1 � .}._ =a-��� �.r... • X Cp i ;, .-f �� - � ^�

Zz:�
GFD - Louisburg, NC
D.A. Nos. 1 thru 14
Shallow Wetlands No. 1
Drainage Area
24.26 acres
Soil Type
WeC, WeB
Hydrologic Soil Group
B
Land Use
C
Wooded
0.2
Impervious
0.95
Grass/Open Space
0.5
Total Acreage
Composite C 0.77
Composite CN 83
5/11/2007
whd
39505
1,056,766 sq, ft,
Acreage CN
0 60
14.67 98
9.59 61
24.26
g
h
P (in)
1-year
104
18
3
2-year
132
18
3.60
10-year
195
22
5.38
25-year
232
23
6.41
c=
0.77
50-year
261
24
7.21
A=
24.26 acres
100-year
290
25
8.00
H=
50 ft
L=
1600 ft
Time of Concentration
tc=
8.70
Min tc=
CN=
83
S=
2.05
1
Q (actual)
Qp
W
Tp
(in/hr)
(cfs)
(cfs)
(in)
(min)
(actual)
1-year
3.90
73.0
73.0
1.45
20.9
2-year
4.94
92.6
92.6
1.94
22.2
10-year
6.35
119.0
119.0
3.52
31.2
25-year
7.32
137.1
137.1
4.47
34.5
50-year
7.98
149.5
149.5
5.23
36.9
100-year
8.61
161.2
161.2
5.98
39.2
1

O'DRIEN 6 GERE
SUBJECT:
PAGE:
BY:
DATE:
JOB NUMBER:
NA r> ��o . I
Z+
\AA'A s
5I111o"1
loo
Table 1.1 Surface Area to Drainage Area Ratio For Permanent Pool Sizing For 85% Pollutant
Removal Efficiency in the Piedmont
% Impervious
Permanent Pool Denth (feet)
Cover
3.0 4.0 5.0 6.0 7.0 8.0 9.0
20
0.97
0.79rO.7
0.59
0.51
0.46
0.44
30
1.34
1.080.83
0.70
0.64
0.6240
1.73
1.431,05
0.90
0.82
0.77
2.06
1.73
1.30
1.09
1.00
0.922.40
2.03
1.51
1.29
1.18
1.10
M901
2.88
2.40
2.07
1.79
1.54
1.35
1.26
3.36
2.78
2.38
2.10
1.86
1.60
1.42
3.74
3.10
2.66
2.34
2.11
1.83
1.67
Notes: Numbers given in the body of the table are given in percentages.
Coastal SA/DA ratios can be obtained from the local DWQ Regional Office.
2,141oa

S
Shallow Wetlands No. 1
Permanent Pool Surface Area Required
Impervious Area (Acres) 14.67
Impervious 60.5
% Impervious Cover from Table 1.1 2.40
Permanent Pool Area (Acres) 0.58
Permanent Pool Area (Sq. Ft.) 25,362
Temp. Pool Volume & Surface Area Req.
Temp. Runoff Volume, Rv (in/in)
0.59
Temp. Pool Volume (acre-feet)
1.2
Temp. Pool Volume (cubic feet)
52,330
Temp. Pool Volume (acre -inches)
14.4
Temp, Pool Depth (inches)
12
Temp. Pool Area (acres)
1.20
Overflow Weir
Orifice
Cw=
3
Orifice Diameter, d (in)=
L=
20 ft.
Number, n=
Q50=
149.5 cfs
Coefficient, Cd=
H=
1.84 ft.
Area, a (sq. ft.)=
Drawdown Rate, Or (cfs)=
Time to Drawdown, T (days)=
4
1
0.3
0.09
0.15
4.1
OK
K,

GBRIEN 6 GERE
F 2 oo�
O'RRIEN Ei GERE'STF60TH ANNIVERSARY
SUBJECT
SHEET
BY
DATE
JOB NO.
.f .G000 Gde�CAN �/d �ivis�o�/O1 �'{,-./'
(P
LS
�/(/-l/07
q'i 5n5
7/,
F
I
,11 11I
f
-
-
2

-- GGRIEN 6 SERE
GEs 2a� o�
G'BRIEN Ei GERE'3 fiOTR ANNIVERSARY
SUBJECT
SHEET
BY
DATE
JOB NO.
rr>r o

9
1S
(new S bcat)
2P
(new Pond)
(SUbcai) (Reach A.n Link; Dranage Diagram for shallow wetlands no 141307
] Prepared by O'BRIEN & GERE 5/16/2007
FHydl,,ADS7.00 s/n 003332 © 1986-2003 Applied Microcomputer Systems

q
shallow wetlands no 1 41307 Rainfall Duration=30 min, Inten=7.98 in/hr
Prepared by O'BRIEN & GERE Page 2
HydroCADO 7.00 sin 003332 © 1986-2003 Applied Microcomputer Systems 5/16/2007
Time span=0.00-3.00 hrs, dt=0.01 hrs, 301 points
Runoff by Rational method, Rise/Fall=1.0/1.0 xTc
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment 1S: (new Subcat) Runoff Area=24.260 ac Runoff Depth=3.07"
Tc=8.7 min C=0.77 Runoff=150.31 cfs 6.211 of
Pond 2P: (new Pond) Peak Elev=273.63' Storage=128,997 cf Inflow=150.31 cfs 6.211 of
Primary=0.33 cfs 0.055 of Secondary=137.04 cfs 5.232 of Outflow=137.37 cfs 5.287 of
Total Runoff Area = 24.260 ac Runoff Volume = 6.211 of Average Runoff Depth = 3.07"

/O
shallow wetlands no 1 41307 Rainfall Duration=30 min, lnten=7.98 in/hr
Prepared by O'BRIEN & GERE Page 3
HydroCAD® 7.00 s/n 003332 © 1986-2003 Applied Microcomputer Systems 5/16/2007
Subcatchment 1S: (new Subcat)
Runoff = 150.31 cfs @ 0.15 hrs, Volume= 6.211 af, Depth= 3.07"
Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs
Rainfall Duration=30 min, Inten=7.98 in/hr
Area (ac) C
24.260 0.77
Tc Length Slope Velocity Capacity Description
(min) (feet) (f /ft) (ft/sec) (cfs)
8.7 Direct Entry,
Subcatchment 1S: (new Subcat)
Hydrograph
— Runoft
140= Rainfall
130-
120-- Duration=30 min,
Inten=7.98 in/hr
N 00- Runoff Area=24.260 ac
u 90-
80 Runoff Volume=6.211 of
LL 70- Runoff Depth=3.07"
60-
50-- Tc=8.7 min
40- C=0.77
2
Time (hours)

shallow wetlands no 1 41307 Rainfall Duration=30 min, Inten=7.98 in/hr
Prepared by O'BRIEN & GERE Page 4
HvdroCAD® 7.00 s/n 003332 © 1986-2003 AoDIied Microcomouter Svstems r;/1 ft/9M7
Time Runoff
(hours) (cfs)
0.00 0.00
0.02 20.73
0.04 41.46
0.06 62.20
0.08 82.93
0.10 103.66
0.12 124.39
0.14 145.13
0.16 150.31
0.18 150.31
0.20 150.31
0.22 150.31
0.24 150.31
0.26 150.31
0.28 150.31
0.30 150.31
0.32 150.31
0.34 150.31
0.36 150.31
0.38 150.31
0.40 150.31
0.42 150.31
0.44 150.31
0.46 150.31
0.48 150.31
0.50 150.31
0.52 129.58
0.54 108.85
0.56 88.11
0.58 67.38
0.60 46.65
0.62 25.92
0.64 5.18
0.66 0.00
0.68 0.00
0.70 0.00
0.72 0.00
0.74 0.00
0.76 0.00
0.78 0.00
0.80 0.00
0.82 0.00
0.84 0.00
0.86 0.00
0.88 0.00
0.90 0.00
0.92 0.00
0.94 0.00
0.96 0.00
0.98 0.00
1.00 0.00
1.02 0.00
Hydrograph for Subcatchment 1S: (new Subcat)
Time Runoff
(hours) (cfs)
1.04 0.00
1.06 0.00
1.08 0.00
1.10 0.00
1.12 0.00
1.14 0.00
1.16 0.00
1.18 0.00
1.20 0.00
1.22 0.00
1.24 0.00
1.26 0.00
1.28 0.00
1.30 0.00
1.32 0.00
1.34 0.00
1.36 0.00
1.38 0.00
1.40 0.00
1.42 0.00
1.44 0.00
1.46 0.00
1.48 0.00
1.50 0.00
1.52 0.00
1.54 0.00
1.56 0.00
1.58 0.00
1.60 0.00
1.62 0.00
1.64 0.00
1.66 0.00
1.68 0.00
1.70 0.00
1.72 0.00
1.74 0.00
1.76 0.00
1.78 0.00
1.80 0.00
1.82 0.00
1.84 0.00
1.86 0.00
1.88 0.00
1.90 0.00
1.92 0.00
1.94 0.00
1.96 0.00
1.98 0.00
2.00 0.00
2.02 0.00
2.04 0.00
2.06 0.00
Time Runoff
(hours) (cfs)
2.08 0.00
2.10 0.00
2.12 0.00
2.14 0.00
2.16 0.00
2.18 0.00
2.20 0.00
2.22 0.00
2.24 0.00
2.26 0.00
2.28 0.00
2.30 0.00
2.32 0.00
2.34 0.00
2.36 0.00
2.38 0.00
2.40 0.00
2.42 0.00
2.44 0.00
2.46 0.00
2.48 0.00
2.50 0.00
2.52 0.00
2.54 0.00
2.56 0.00
2.58 0.00
2.60 0.00
2.62 0.00
2.64 0.00
2.66 0.00
2.68 0.00
2.70 0.00
2.72 0.00
2.74 0.00
2.76 0.00
2.78 0.00
2.80 0.00
2.82 0.00
2.84 0.00
2.86 0.00
2.88 0.00
2.90 0.00
2.92 0.00
2.94 0.00
2.96 0.00
2.98 0.00
3.00 0.00

/ Z_
shallow wetlands no 141307 Rainfall Duration=30 min, Inten=7.98 in/hr
Prepared by O'BRIEN & GERE Page 5
HydroCAD& 7.00 s/n 003332 & 1986-2003 Applied Microcomputer Systems 5/16/2007
Pond 2P: (new Pond)
Inflow Area = 24.260 ac, Inflow Depth = 3.07"
Inflow = 150.31 cfs @ 0.15 hrs, Volume= 6.211 of
Outflow = 137.37 cfs @ 0.51 hrs, Volume= 5.287 af, Atten= 9%, Lag= 21.8 min
Primary = 0.33 cfs @ 0.51 hrs, Volume= 0.055 of
Secondary = 137.04 cfs @ 0.51 hrs, Volume= 5.232 of
Routing by Stor-Ind method, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs
Peak Elev= 273.63' @ 0.51 hrs Surf.Area= 58,163 sf Storage= 128,997 cf
Plug -Flow detention time= 19.2 min calculated for 5.287 of (85% of inflow)
Center -of -Mass det. time= 16.8 min ( 36.2 - 19.4 )
# Invert Avail.Storage Storage Description
1 271.00' 212,013 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic -feet) (cubic -feet)
271.00 26,282 0 0
271.75 44,919 26,700 26,700
272.00 52,181 12,138 38,838
273.00 55,787 53,984 92,822
273.75 58,604 42,897 135,719
274.00 59,561 14,771 150,489
275.00 63,487 61,524 212,013
# Routing Invert Outlet Devices
1 Primary 271.00' 4.0" Vert. Orifice/Grate C= 0.300
2 Secondary 272.00' 20.0' long x 1.0' breadth Broad -Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2,50
3.00
Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31
3.32
Primary OutFlow Max=0.33 cfs @ 0.51 hrs HW=273.63' (Free Discharge)
t1=Orifice/Grate (Orifice Controls 0.33 cfs @ 3.8 fps)
Secondary OutFlow Max=136.95 cfs @ 0.51 hrs HW=273.63' (Free Discharge)
L2=Broad-Crested Rectangular Weir (Weir Controls 136.95 cfs @ 4.2 fps)

!3
shallow wetlands no 1 41307 Rainfall Duration=30 min, Inten=7.98 in/hr
Prepared by O'BRIEN & GERE Page 6
HydroCADO 7.00 s/n 003332 O 1986-2003 Applied Microcomputer Systems 5/16/2007
W
Pond 2P: (new Pond)
Hydrograph
Time (hours)
Pond 2P: (new Pond)
Stage -Discharge
0 50 100 150 200 250 300
Discharge (cfs)
— Inflow
— Outflow
— Primary
— Secondary
— Total
— Primary
— Secondary

/q
shallow wetlands no 1 41307 Rainfall Duration=30 min, Inten=7.98 in/hr
Prepared by O'BRIEN & GERE Page 7
HydroCADO 7.00 s/n 003332 © 1986-2003 Applied Microcomputer Systems 5/16/2007
W
Pond 2P: (new Pond)
Stage -Area -Storage
Storage (cubic -feet)
Surface
Storage

/5
shallow wetlands no 141307 Rainfall Duration=30 min, Inten=7.98 in/hr
Prepared by O'BRIEN & GERE Page 8
HydroCADO 7.00 s/n 003332 © 1986-2003 Applied Microcomputer Systems 5/16/2007
Hydrograph for Pond 2P: (new Pond)
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
271.00
0.00
0.00
0.00
0.10
103.66
18,645
271.52
0.13
0.13
0.00
0.20
150.31
67,137
272.52
21.04
0.24
20,79
0.30
150.31
103,095
273.18
78.97
0.30
78.67
0.40
150.31
120,934
273.49
118.24
0.32
117.92
0.50
150.31
128,691
273.63
136.66
0.33
136.33
0.60
46.65
117,690
273.43
110.79
0.32
110.48
0.70
0.00
91,809
272.98
57.99
0.28
57.71
0.80
0.00
76,192
272.69
32.46
0.26
32.20
0.90
0.00
66,860
272.52
20.72
0.24
20.48
1.00
0.00
60,665
272.40
14.23
0.23
13.99
1.10
0.00
56,318
272.32
10.21
0.23
9.99
1.20
0.00
53,143
272.26
7.60
0.22
7.38
1.30
0.00
50,749
272.22
5.82
0.22
5.60
1.40
0.00
48,897
272.19
4.56
0.21
4.34
1.50
0.00
47,430
272.16
3.63
0.21
3.42
1.60
0.00
46,248
272.14
2.96
0.21
2.76
1.70
0.00
45,282
272.12
2.43
0.21
2.22
1.80
0.00
44,479
272.10
2.04
0.20
1.84
1.90
0.00
43,802
272.09
1.72
0.20
1.52
2.00
0.00
43,231
272.08
1.45
0.20
1.25
2.10
0.00
42,744
272.07
1.27
0.20
1.07
2.20
0.00
42,316
272.06
1.11
0.20
0.91
2.30
0.00
41,942
272.06
0.97
0.20
0.77
2.40
0.00
41,614
272.05
0.85
0.20
0.66
2.50
0.00
41,326
272.05
0.75
0.20
0.55
2.60
0.00
41,074
272.04
0.65
0.20
0.46
2.70
0.00
40,850
272.04
0.60
0.20
0.40
2.80
0.00
40,643
272.03
0.56
0.20
0.36
2.90
0.00
40,450
272.03
0.52
0.20
0.32
3.00
0.00
40,271
272.03
0.48
0.19
0.29

shallow wetlands no 1 41307 Rainfall Duration=30 min, Inten=7.98 in/hr
Prepared by O'BRIEN & GERE Page 9
HydroCADO 7.00 s/n 003332 © 1986-2003 Applied Microcomputer Systems 5/16/2007
Stage -Discharge for Pond 2P: (new Pond)
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
271.00
0.00
0.00
0.00
271.05
0.00
0.00
0.00
271.10
0.01
0.01
0.00
271.15
0.03
0.03
0.00
271.20
0.04
0.04
0.00
271.25
0.06
0.06
0.00
271.30
0.08
0.08
0.00
271.35
0.09
0.09
0.00
271.40
0.10
0.10
0.00
271.45
0.11
0.11
0.00
271.50
0.12
0.12
0.00
271.55
0.13
0.13
0.00
271.60
0.14
0.14
0.00
271.65
0.15
0.15
0.00
271.70
0.15
0.15
0.00
271.75
0.16
0.16
0.00
271.80
0.17
0.17
0.00
271.85
0.17
0.17
0.00
271.90
0.18
0.18
0.00
271.95
0.19
0.19
0.00
272.00
0.19
0.19
0.00
272.05
0.80
0.20
0.60
272.10
1.90
0.20
1.70
272.15
3.33
0.21
3.13
272.20
5.03
0.21
4.81
272.25
6.96
0.22
6.74
272.30
9.11
0.22
8.89
272.35
11.46
0.23
11.23
272.40
14.00
0.23
13.76
272.45
16.70
0.24
16.47
272.50
19.58
0.24
19.34
272.55
22.62
0.25
22.37
272.60
25.81
0.25
25.56
272.65
29.34
0.26
29.08
272.70
33.06
0.26
32.80
272.75
36.96
0.26
36.70
272.80
41.05
0.27
40.79
272.85
45.45
0.27
45.18
272.90
50.05
0.28
49.78
272.95
54.87
0.28
54.58
273.00
59.88
0.28
59.60
273.05
64.95
0.29
64.66
273.10
70.21
0.29
69.91
273.15
75.65
0.30
75.35
273.20
81.27
0.30
80.98
273.25
87.23
0.30
86.93
273.30
93.39
0.31
93.08
273.35
99.76
0.31
99.45
273.40
106.33
0.31
106.02
273.45
112.76
0.32
112.44
273.50
119.37
0.32
119.05
273.55
126.14
0.32
125.82
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
273.60
133.09
0.33
132.77
273.65
139.69
0.33
139.35
273.70
146.40
0.33
146.07
273.75
153.25
0.34
152.91
273.80
160.21
0.34
159.87
273.85
166.80
0.34
166.45
273.90
173.46
0.35
173.11
2 73.9 5
180.21
0.35
179.86
274.00
187.03
0.35
186.68
274.05
194.14
0.36
193.78
274.10
201.33
0.36
200.97
274.15
208.62
0.36
208.26
274.20
215.99
0.37
215.63
274.25
223.46
0.37
223.09
274.30
231.01
0.37
230.63
274.35
238.64
0.37
238.27
274.40
246.36
0.38
245.99
274.45
254.17
0.38
253.79
274.50
262.06
0.38
261.68
274.55
270.04
0.39
269.65
274.60
278.09
0.39
277.70
274.65
286.23
0.39
285.84
274.70
294.45
0.39
294.05
274.75
302.75
0.40
302.35
274.80
311.13
0.40
310.73
274.85
319.59
0.40
319.19
274.90
328.13
0.41
327.72
274.95
336.74
0.41
336.33
275.00
345.44
0.41
345.02

.7
shallow wetlands no 1 41307 Rainfall Duration=30 min, Inten=7.98 in/hr
Prepared by O'BRIEN & GERE Page 10
HydroCADO 7.00 s/n 003332 O 1986-2003 Applied Microcomputer Systems 5/16/2007
Stage -Area -Storage for Pond 2P: (new Pond)
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
271.00
26,282
0
271.05
27,524
1,780
271.10
28,767
3,560
271.15
30,009
5,340
271.20
31,252
7,120
271.25
32,494
8,900
271.30
33,737
10,680
271.35
34,979
12,460
271.40
36,222
14,240
271.45
37,464
16,020
271.50
38,707
17,800
271.55
39,949
19,580
271.60
41,192
21,360
271.65
42,434
23,140
271.70
43,677
24,920
271.75
44,919
26,700
271.80
46,371
29,128
271.85
47,824
31,555
271.90
49,276
33,983
271.95
50,729
36,410
272.00
52,181
38,838
272.05
52,361
41,537
272.10
52,542
44,236
272.15
52,722
46,935
272.20
52,902
49,635
272.25
53,083
52,334
272.30
53,263
55,033
272.35
53,443
57,732
272.40
53,623
60,431
272.45
53,804
63,131
272.50
53,984
65,830
272.55
54,164
68,529
272.60
54,345
71,228
272.65
54,525
73,927
272.70
54,705
76,627
272.75
54,886
79,326
272.80
55,066
82,025
272.85
55,246
84,724
272.90
55,426
87,423
272.95
55,607
90,123
273.00
55,787
92,822
273.05
55,975
95,682
273.10
56,163
98,541
273.15
56,350
101,401
273.20
56,538
104,261
273.25
56,726
107,121
273.30
56,914
109,981
273.35
57,102
112,840
273.40
57,289
115,700
273.45
57,477
118,560
273.50
57,665
121,420
273.55
57,853
124,279
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
273.60
58,041
127,139
273.65
58,228
129,999
273.70
58,416
132,859
273.75
58,604
135,719
273.80
58,795
138,673
273.85
58,987
141,627
273.90
59,178
144,581
273.95
59,370
147,535
274.00
59,561
150,489
274.05
59,757
153,565
274.10
59,954
156,642
274.15
60,150
159,718
274.20
60,346
162,794
274.25
60,543
165,870
274.30
60,739
168,946
274.35
60,935
172,023
274.40
61,131
175,099
274.45
61,328
178,175
274.50
61,524
181,251
274.55
61,720
184,327
274.60
61,917
187,404
274.65
62,113
190,480
274.70
62,309
193,556
274.75
62,506
196,632
274.80
62,702
199,708
274.85
62,898
202,785
274.90
63,094
205,861
274.95
63,291
208,937
275.00
63,487
212,013

GBRIEN 6 GERE
O'BRIEN 5 GERE'B 60TH ANNIVERSARY
SUBJECT
SHEET
BY
DATE
JOB NO.
L� rzC
uo ��o.,✓ V /G'it-c�_��e� � �� I — v � �U s� ae�-.G �r�1.J c�
r
v-, -
o � 141-e�, �s S
1_
TH✓. =tiJ
2(,S. o
:2 o_R
a
I i-1✓. ou'r
' Ito I
�.loz

GBRIEN 6 GERE
O'BRIE1 46'Sf��TH 006 ANNIVERSARY
SUBJECT
SHEET
BY
DATE
JOB NO.
L.�L-{IL.1311(L(� �LI��Q.
1�
VJi1�
I24I0%
�ji�07�
Cyr lar ldlr�
z
�OC
-G 2-Lo2,Cv
Z
1--, � ; ;, .0 I ' 3.01
-7
% I

>O
0
0
Cl.
N
C
a
M
N
in
a�
0
m
'O
a�
m
c
U
J
N
L
rn
L
w
° o 0 N m 0 0 0
a a33 > O `°rar
0 o o w a o o> o>
@ 0 0 c m c
o m rn c o o v o m o. a c o
o > a m c
O @ 00. J J O O O N N
p C C L O O v 0 N 'a L a O. EL. E .0 N N O
L 0 0 o m E E a c o 0 o a o@ o J
C w 0 :: E
a°i 0 0� o> u a 3 C 0 3 3 N a a
C O O_ O U C C W O Q O. a N N N j W
tl
N N
N
C O N ❑ ❑ O) ❑ ❑ ❑ O ❑
Co O O N 0 �. O N ❑ a
> =a❑❑ a N
i�crcn�>���NNN❑ �0NN�JJ�
0
N I"O O �: N m M 0-'� I� M (O M O O O W N
C O 'O O f to V N OJ O' r m m m O m m s ,' O M N M O O
N h'M r; Cj N'I M `N O

Draina e Area Anal sis Shallow Wetland No. 2 Basin
Drainage Area No.
Impervious
Lawn/Landscape
Total Area
Composite C factor
15
0.96
0.24
1.2
0.75
16
0.76
0.34
1.1
0.67
17
0.71
0.33
1.04
0.66
18
0.2
0.19
0.39
0.53
19
0.24
0.03
0.27
0.82
20
1.38
1.6
2.98
0.50
21
0.03
0.08
0.11
0.35
22
0.14
1.41
1.55
0.22
23
0.2
0.03
0.23
0.80
24
0.11
0.12
0.23
0.51
25
0.81
0
0.81
0.90
26
0.43
0
0.43
0.90
27
0.23
0.13
0.36
0.63
28
0.11
0.05
0.16
1 0.67
29
1.78
0.3
2.08
0.79
30
0.11
0.05
0.16
0.67
31
0.26
0.13
0.39
0.65
32
1.24
0.25
1.49
0.77
33
0.27
0.1
0.37
0.70
34
0.48
0.18
0.66
0.70
35
0
1.11
1.11
0.15
Total
10.45
6.67
17.12
0.61

--== O'DRIEN5GERE
SUBJECT
SHEET
BY
DATE
JOB NO.
C. ALL w-✓ s �. IE-iG.-F-:rarer �-
ZZ'
�/-I Fti `^'
\l 2 Olo
�11� la'1
/a f�.-,,,E T o
VI • I z
"kz-fe _ 4/c�7v�ec
R�
�,.. �::, t.tl� ? . �•. C-... �..1 �-�C1�C3-C�. `F•�� l,f -�- wit ��h A�P I -r= C� .. . �j L��
G U • :-> a �"� �� �.-�.,--, c, c� �' � C I N
, F-

GFD - Lousiburg, NC
D.A. Nos. 15 thru 35
Shallow Wetlands No. 2
Drainage Area
17.12 acres
Soil Type
WeC, WeB
Hydrologic Soil Group
B
Land Use
C
Wooded
0.2
Impervious
0.95
Grass/Open Space
0.5
Imperviousness (%)
61.0
Total Acreage
Composite C
0.77
Composite CN
84
g
h
1-year
104
18
2-year
132
18
10-year
195
22
25-year
232
23
50-year
261
24
100-year
290
25
1-year
2-year
10-year
25-year
50-year
100-year
745,747 sq, ft,
Acreage
0
10.45
6.67
17.12
P (in)
3
3.60
5.38
6.41
c=
7.21
A=
8.00
H=
L=
Time of Concentration
tc=
CN=
S=
5/11 /2007
whd
39505
CN
60
98
61
0.77
17.12 acres
70 ft
1900 ft
9.32 Min tc= 5
84
1.90
I
Q (actual)
Qp
W
Tp
(in/hr)
(cfs)
(cfs)
(in)
(min)
(actual)
3.81
50.5
50.5
1.52
22.4
4.83
64.1
64.1
2.02
23.5
6.23
82.6
82.6
3.62
32.7
7.18
95.2
95.2
4.58
35.9
7.83
103.9
103.9
5.34
38.3
8.45
112.1
112.1
6.10
40.5
1

GBRIEN 6 GERE
SUBJECT:
/
` t
-7
P�A7GE:
BY:
DATE:
JOB NUMBER:
Table 1.1 Surface Area to Drainage Area Ratio For Permanent Pool Sizing For 85% Pollutant
Removal Efficiency in the Piedmont
% Impervious
Permanent Pool Denth (feet)
Cover
3.0 4.0 5.0 6.0 7.0 8.0 9.0
20
0.97
0.79
0.70
0.59P0.51
0.46
0.44
1.34
1.08
0.97
0.83
0.64
0.62
1.73
1.43
1.25
1.05
0.82
0.77
50
2.06
1.73
1.50
1.30
1.00
0.92
60
2.40
2.03
1.71
1.51
1.18
1.10
70
2.88
2.40
2.07
1.79
1.54
1.35
1.26
80
3.36
2.78
2.38
2.10
1.86
1.60
1.42
90
3.74
3.10
2.66
2.34
2.11
1.83
1.67
Notes: Numbers given in the body of the table are given in percentages.
Coastal SA/DA ratios can be obtained from the local DWQ Regional Office.
l! u o y-- I `l , I Z Vic_ , Wiz. O.-It

GBRIEN 6 GERE
SUBJECT:
PAGE:
BY:
DATE(:
JOB NUMBER:
/ d j
G, 11 t�. t i o i l E E --..Y' J - P 1 r'-1 -?
/
2� ✓2
-e-/o" a
[> j I I I O 1
� —( 1= /)
\l
V, 0 .'� Y. n • i l- iI-
r) . 8 to 1 7

2U
Shallow Wetlands No. 2
Permanent Pool Surface Area Required
Impervious Area (Acres) 10.45
% Impervious 61.0
% Impervious Cover from Table 1.1 2.40
Permanent Pool Area (Acres) 0.41
Permanent Pool Area (Sq. Ft.) 17,898
Temp. Pool Volume and Surface Area Req.
Temp. Runoff Volume, Rv (in/in)
0.60
Temp. Pool Volume (acre-feet)
0.9
Temp. Pool Volume (cubic feet)
37,247
Temp. Pool Volume (acre -inches)
10.3
Temp. Pool Depth (inches)
12
Temp. Pool Area (acres)
0.86
Overflow Weir
Orifice
Cw= 3 Orifice Diameter, d (in)=
L= 20 ft. Number, n=
Q50= 103.9 cfs Coefficient, Cd=
H= 1.44 ft. Area, a (sq. ft.)=
Drawdown Rate, Or (cfs)=
Time to Drawdown, T (days)=
4
1
0.3
0.09
0.15
2.9
OK
P]

GBRIEN 6 GERE
1946 2
G'BRIEN E+GERE'S fiOTH ANNIVERSARY
SUBJECT
SHEET
BY
DATE
I JOB NO.

M GBRIEN 5 GERE
�946 2S 006
O'BgIEN E GERE'8 / BOTH ANNIVERSARY
SUBJECT
SHEET
BY
DATE
JOB NO.
-/� oG.� Wq} /✓ 0 1 .v �ii /� -
2�J
'bG`�
Itl(O"I
3�17gS
ir�oo�: l�✓ci2 2r
bnv c-/2:T/r7
---
---

1S
(new Subcat)
2P
(new Pond)
CSuat Reach _on Ink' age Diagram for shallow wetlands no 2 41607
epared by O'BRIEN & GERE 5/16/2007
FHydIOCA.00 s/n003332 ©1986-2003 Applied Microcomputer Systems

30
shallow wetlands no 2 41607 Rainfall Duration=30 min, Inten=7.83 in/hr
Prepared by O'BRIEN & GERE Page 2
HydreCADO 7.00 s/n 003332 © 1986-2003 Applied Microcomputer Systems 5/16/2007
Time span=0.00-3.00 hrs, dt=0.01 hrs, 301 points
Runoff by Rational method, Rise/Fall=1.0/1.0 xTc
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment 1S: (new Subcat) Runoff Area=17.120 ac Runoff Depth=3.01"
Tc=9.3 min C=0.77 Runoff=104.08 cfs 4.301 of
Pond 2P: (new Pond) Peak Elev=262.34' Storage=83,095 cf Inflow=104.08 cfs 4.301 of
Primary=0.31 cfs 0.053 of Secondary=98.21 cfs 3.579 of Outflow=98.52 cfs 3.631 of
Total Runoff Area = 17.120 ac Runoff Volume = 4.301 of Average Runoff Depth = 3.01"

31
shallow wetlands no 2 41607 Rainfall Duration=30 min, Inten=7.83 in/hr
Prepared by O'BRIEN & GERE Page 3
HydroCADO 7.00 s/n 003332 © 1986-2003 Applied Microcomputer Systems 5/16/2007
Subcatchment 1S: (new Subcat)
Runoff = 104.08 cfs @ 0.16 hrs, Volume= 4.301 af, Depth= 3.01"
Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs
Rainfall Duration=30 min, Inten=7.83 in/hr
Area (ac) C Description
17.120 0.77
Tc Length
Description
9.3 Direct Entry,
Subcatchment 1S: (new Subcat)
Hydrograph
115=
110. 104.08 efs
105-
95:
Rainfall
90-
fly. Duration=30 min,
80
75Inten=7.83 in/hr
70
� 55-:
Runoff Area=17.120 ac
v 60
55-
Runoff Volume=4.301 of
45 Runoff Depth=3.01"
40:
35 Tc=9.3 min
30-I
25- C=0.77
Time (hours)
— Runoff

32
shallow wetlands no 2 41607 Rainfall Duration=30 min, Inten=7.83 in/hr
Prepared by O'BRIEN & GERE Page 4
HydroCAD®7 00 s/n 003332 © 1986-2003 Applied Microcomputer Systems 5/16/2007
Time Runoff
(hours) (cfs)
0.00 0.00
0.02 13.43
0.04 26.86
0.06 40.29
0.08 53.72
0.10 67.15
0.12 80.58
0.14 94.01
0.16 104.08
0.18 104.08
0.20 104.08
0.22 104.08
0.24 104.08
0.26 104.08
0.28 104.08
0.30 104.08
0.32 104.08
0.34 104.08
0.36 104.08
0.38 104.08
0.40 104.08
0.42 104.08
0.44 104.08
0.46 104.08
0.48 104.08
0.50 104.08
0.52 90.65
0.54 77.22
0.56 63.79
0.58 50.36
0.60 36.93
0.62 23.50
0.64 10.07
0.66 0.00
0.68 0.00
0.70 0.00
0.72 0.00
0.74 0.00
0.76 0.00
0.78 0.00
0.80 0.00
0.82 0.00
0.84 0.00
0.86 0.00
0.88 0.00
0.90 0.00
0.92 0.00
0.94 0.00
0.96 0.00
0.98 0.00
1.00 0.00
1.02 0.00
Hydrograph for Subcatchment 1S: (new Subcat)
Time Runoff
(hours) (cfs)
1.04 0.00
1.06 0.00
1.08 0.00
1.10 0.00
1.12 0.00
1.14 0.00
1.16 0.00
1.18 0.00
1.20 0.00
1.22 0.00
1.24 0.00
1.26 0.00
1.28 0.00
1.30 0.00
1.32 0.00
1.34 0.00
1.36 0.00
1.38 0.00
1.40 0.00
1.42 0.00
1.44 0.00
1.46 0.00
1.48 0.00
1.50 0.00
1.52 0.00
1.54 0.00
1.56 0.00
1.58 0.00
1.60 0.00
1.62 0.00
1.64 0.00
1.66 0.00
1.68 0.00
1.70 0.00
1.72 0.00
1.74 0.00
1.76 0.00
1.78 0.00
1.80 0.00
1.82 0.00
1.84 0.00
1.86 0.00
1.88 0.00
1.90 0.00
1.92 0.00
1.94 0.00
1.96 0.00
1.98 0.00
2.00 0.00
2.02 0.00
2.04 0.00
2.06 0.00
Time Runoff
(hours) (cfs)
2.08 0.00
2.10 0.00
2.12 0.00
2.14 0.00
2.16 0.00
2.18 0.00
2.20 0.00
2.22 0.00
2.24 0.00
2.26 0.00
2.28 0.00
2.30 0.00
2.32 0.00
2.34 0.00
2.36 0.00
2.38 0.00
2.40 0.00
2.42 0.00
2.44 0.00
2.46 0.00
2.48 0.00
2.50 0.00
2.52 0.00
2.54 0.00
2.56 0.00
2.58 0.00
2.60 0.00
2.62 0.00
2.64 0.00
2.66 0.00
2.68 0.00
2.70 0.00
2.72 0.00
2.74 0.00
2.76 0.00
2.78 0.00
2.80 0.00
2.82 0.00
2.84 0.00
2.86 0.00
2.88 0.00
2.90 0.00
2.92 0.00
2.94 0.00
2.96 0.00
2.98 0.00
3.00 0.00

j
shallow wetlands no 2 41607 Rainfall Duration=30 min, Inten=7.83 in/hr
Prepared by O'BRIEN & GERE Page 5
HydroCADO 7.00 s/n 003332 O 1986-2003 Applied Microcomputer Systems 5/16/2007
Pond 2P: (new Pond)
Inflow Area =
17.120 ac, Inflow Depth = 3.01"
Inflow =
104.08 cfs @ 0.16 hrs, Volume= 4.301 of
Outflow =
98.52 cfs @ 0.51 hrs, Volume= 3.631 af, Atten= 5%, Lag= 20.9 min
Primary =
0.31 cfs @ 0.51 hrs, Volume= 0.053 of
Secondary =
98.21 cfs @ 0.51 hrs, Volume= 3.579 of
Routing by Stor-Ind
method, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs
Peak Elev= 262.34' @ 0.51 hrs Surf.Area= 41,870 sf Storage= 83,095 cf
Plug -Flow detention
time= 16.8 min calculated for 3.619 of (84% of inflow)
Center -of -Mass det. time= 14.8 min ( 34.4 - 19.7 )
# Invert
Avail.Storage Storage Description
1 260.00'
155,815 cf Custom Stage Data (Prismatic) Listed below
Elevation
Surf.Area Inc.Store CUm.Store
(feet)
(sq-ft) (cubic -feet) (cubic -feet)
260.00
19,352 0 0
261.00
38,530 28,941 28,941
262.00
41,009 39,770 68,711
263.00
43,540 42,275 110,985
264.00
46,120 44,830 155,815
# Routing
Invert Outlet Devices
1 Primary
260.00' 4.0" Vert. Orifice/Grate C= 0.300
2 Secondary
261.00' 20.0' long x 1.0' breadth Broad -Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50
3.00
Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31
3.32
Primary OutFlow Max=0.31 cfs @ 0.51 hrs HW=262.34' (Free Discharge)
t1=Orifice/Grate (Orifice Controls 0.31 cfs @ 3.5 fps)
Secondary OutFlow Max=98.15 cfs @ 0.51 hrs HW=262.34' (Free Discharge)
t2=Broad -Crested Rectangular Weir (Weir Controls 98.15 cfs @ 3.7 fps)

�i:-t
shallow wetlands no 2 41607 Rainfall Duration=30 min, Inten=7.83 in/hr
Prepared by O'BRIEN & GERE Page 6
HydroCADO 7.00 s/n 003332 © 1986-2003 Applied Microcomputer Systems 5/16/2007
w
Pond 2P:(new Pond)
Hydrograph
— Inflow
— Outflow
— Primary
Inflow Area=17.120 ac -Secondary
Peak Elev=262.34'
Storage=83,095 cf
Time (hours)
Pond 2P: (new Pond)
Stage -Discharge
Discharge (cfs)
— Total
— Primary
— Secondary

g5,
shallow wetlands no 2 41607 Rainfall Duration=30 min, Inten=7.83 in/hr
Prepared by O'BRIEN & GERE Page 7
HydroCADO 7.00 s/n 003332 O 1986-2003 Applied Microcomputer Systems 5/16/2007
a.
Pond 2P: (new Pond)
Stage -Area -Storage
SurfacelHorizontaMetted Aroa tsq.t
Storage (cubic -feet)
Surface
Storage

-2�CP
shallow wetlands no 2 41607 Rainfall Duration=30 min, lnten=7.83 in/hr
Prepared by O'BRIEN & GERE Page 8
HydroCADO 7.00 s/n 003332 © 1986-2003 Applied Microcomputer Systems 5/16/2007
Hydrograph for Pond 2P: (new Pond)
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
260.00
0.00
0.00
0.00
0.10
67.15
12,076
260.42
0.11
0.11
0.00
0.20
104.08
44,860
261.40
14.01
0.23
13.78
0.30
104.08
68,884
262.00
60.30
0.28
60.01
0.40
104.08
79,231
262.25
87.10
0.30
86.80
0.50
104.08
83,008
262.34
98.25
0.31
97.94
0.60
36.93
75,549
262.16
76.96
0.30
76.66
0.70
0.00
58,968
261.76
37.37
0.26
37.11
0.80
0.00
49,119
261.51
20.03
0.24
19.79
0.90
0.00
43,468
261.37
12.22
0.23
11.99
1.00
0.00
39,891
261.28
8.03
0.22
7.81
1.10
0.00
37,475
261.21
5.58
0.22
5.37
1.20
0.00
35,763
261.17
4.05
0.21
3.84
1.30
0.00
34,500
261.14
3.04
0.21
2.83
1.40
0.00
33,542
261.12
2.33
0.20
2.13
1.50
0.00
32,793
261.10
1.85
0.20
1.65
1.60
0.00
32,199
261.08
1.47
0.20
1.27
1.70
0.00
31,718
261.07
1.22
0.20
1.02
1.80
0.00
31,317
261.06
1.02
0.20
0.82
1.90
0.00
30,982
261.05
0.85
0.20
0.65
2.00
0.00
30,701
261.04
0.71
0.20
0.51
2.10
0.00
30,466
261.04
0.61
0.20
0,41
2.20
0.00
30,258
261.03
0.55
0.20
0.36
2.30
0.00
30,068
261.03
0.50
0.20
0.31
2.40
0.00
29,897
261.02
0.45
0.19
0.26
2.50
0.00
29,742
261.02
0.41
0.19
0.22
2.60
0.00
29,601
261.02
0.37
0.19
0.18
2.70
0.00
29,473
261.01
0.34
0.19
0.14
2.80
0.00
29,358
261.01
0.31
0.19
0.11
2.90
0.00
29,253
261.01
0.28
0.19
0.08
3.00
0.00
29,158
261.01
0.25
0.19
0.06

37
shallow wetlands no 2 41607 Rainfall Duration=30 min, lnten=7.83 in/hr
Prepared by O'BRIEN & GERE Page 9
HydroCADO 7.00 s/n 003332 © 1986-2003 Applied Microcomputer Systems 5/16/2007
Stage -Discharge for Pond 2P: (new Pond)
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
260.00
0.00
0.00
0.00
260.05
0.00
0.00
0.00
260.10
0.01
0.01
0.00
260.15
0.03
0.03
0.00
260.20
0.04
0.04
0.00
260.25
0.06
0.06
0.00
260.30
0.08
0.08
0.00
260.35
0.09
0.09
0.00
260.40
0.10
0.10
0.00
260.45
0.11
0.11
0.00
260.50
0.12
0.12
0.00
260.55
0.13
0.13
0.00
260.60
0.14
0.14
0.00
260.65
0.15
0.15
0.00
260.70
0.15
0.15
0.00
260.75
0.16
0.16
0.00
260.80
0.17
0.17
0.00
260.85
0.17
0.17
0.00
260.90
0.18
0.18
0.00
260.95
0.19
0.19
0.00
261.00
0.19
0.19
0.00
261.05
0.80
0.20
0.60
261.10
1.90
0.20
1.70
261.15
3.33
0.21
3.13
261.20
5.03
0.21
4.81
261.25
6.96
0.22
6.74
261.30
9.11
0.22
8.89
261.35
11.46
0.23
11.23
261.40
14.00
0.23
13.76
261.45
16.70
0.24
16.47
261.50
19.58
0.24
19.34
261.55
22.62
0.25
22.37
261.60
25.81
0.25
25.56
261.65
29.34
0.26
29.08
261.70
33.06
0.26
32.80
261.75
36.96
0.26
36.7C
261.80
41.05
0.27
40.79
261.85
45.45
0.27
45.18
261.90
50.05
0.28
49.78
261.95
54.87
0.28
54.58
262.00
59.88
0.28
59.6C
262.05
64.95
0.29
64.6E
262.10
70.21
0.29
69.91
262.15
75.65
0.30
75.3E
262.20
81.27
0.30
80.9E
262.25
87.23
0.30
86.92
262.30
93.39
0.31
93.0E
262.35
99.76
0.31
99.4E
262.40
106.33
0.31
106.02
262.45
112.76
0.32
112.44
262.50
119.37
0.32
119.0E
262.55
126.14
0.32
125.82
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
262.60
133.09
0.33
132.77
262.65
139.69
0.33
139.35
262.70
146.40
0.33
146.07
262.75
153.25
0.34
152.91
262.80
160.21
0.34
159.87
262.85
166.80
0.34
166.45
262.90
173.46
0.35
173.11
262.95
180.21
0.35
179.86
263.00
187.03
0.35
186.68
263.05
194.14
0.36
193.78
263.10
201.33
0.36
200.97
263.15
208.62
0.36
208.26
263.20
215.99
0.37
215.63
263.25
223.46
0.37
223.09
263.30
231.01
0.37
230.63
263.35
238.64
0.37
238.27
263.40
246.36
0.38
245.99
263.45
254.17
0.38
253.79
263.50
262.06
0.38
261.68
263.55
270.04
0.39
269.65
263.60
278.09
0.39
277.70
263.65
286.23
0.39
285.84
263.70
294.45
0.39
294.05
263.75
302.75
0.40
302.35
263.80
311.13
0.40
310.73
263.85
319.59
0.40
319.19
263.90
328.13
0.41
327.72
263.95
336.74
0.41
336.33
264.00
345.44
0.41
345.02

shallow wetlands no 2 41607 Rainfall Duration=30 min, Inten=7.83 in/hr
Prepared by O'BRIEN & GERE Page 10
HydroCAD®7 00 s/n 003332 © 1986-2003 Applied Microcomputer Systems 5/16/2007
Stage -Area -Storage for Pond 2P: (new Pond)
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
260.00
19,352
0
260.05
20,311
1,447
260.10
21,270
2,894
260.15
22,229
4,341
260.20
23,188
5,788
260.25
24,147
7,235
260.30
25,105
8,682
260.35
26,064
10,129
260.40
27,023
11,576
260.45
27,982
13,023
260.50
28,941
14,471
260.55
29,900
15,918
260.60
30,859
17,365
260.65
31,818
18,812
260.70
32,777
20,259
260.75
33,736
21,706
260.80
34,694
23,153
260.85
35,653
24,600
260.90
36,612
26,047
260.95
37,571
27,494
261.00
38,530
28,941
261.05
38,654
30,929
261.10
38,778
32,918
261.15
38,902
34,906
261.20
39,026
36,895
261.25
39,150
38,883
261.30
39,274
40,872
261.35
39,398
42,860
261.40
39,522
44,849
261.45
39,646
46,837
261.50
39,770
48,826
261.55
39,893
50,814
261.60
40,017
52,803
261.65
40,141
54,791
261.70
40,265
56,780
261.75
40,389
58,768
261.80
40,513
60,757
261.85
40,637
62,745
261.90
40,761
64,734
261.95
40,885
66,722
262.00
41,009
68,711
262.05
41,136
70,824
262.10
41,262
72,938
262.15
41,389
75,052
262.20
41,515
77,165
262.25
41,642
79,279
262.30
41,768
81,393
262.35
41,895
83,507
262.40
42,021
85,620
262.45
42,148
87,734
262.50
42,275
89,848
262.55
42,401
91,961
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
262.60
42,528
94,075
262.65
42,654
96,189
262.70
42,781
98,303
262.75
42,907
100,416
262.80
43,034
102,530
262.85
43,160
104,644
262.90
43,287
106,758
262.95
43,413
108,871
263.00
43,540
110,985
263.05
43,669
113,227
263.10
43,798
115,468
263.15
43,927
117,709
263.20
44,056
119,951
263.25
44,185
122,193
263.30
44,314
124,434
263.35
44,443
126,676
263.40
44,572
128,917
263.45
44,701
131,158
263.50
44,830
133,400
263.55
44,959
135,642
263.60
45,088
137,883
263.65
45,217
140,124
263.70
45,346
142,366
263.75
45,475
144,608
263.80
45,604
146,849
263.85
45,733
149,091
263.90
45,862
151,332
263.95
45,991
153,573
264.00
46,120
155,815

O'ORIEN E GERE
46,,,, 2006
D'DRIEN S GERE'S 1'� 6GTH ANNIVERSARY
SUBJECT
SHEET
BY
DATE
JOB NO.
�o �•%Qu Q-t.. ���
�'�141,
0
Tb- -/ TT
2 S I.0
3� o
WSJ
- $16
`a<O-t�13]
�o, 0 4,
�. 3lo
g•rjr
4S. 4

O'DRICN 5 GCRC
1 46 2006
O'BRIEN Ei GERE'S `1 BOTH ANNIVERSARY
SUBJECT
SHEET
BY
DATE
JOB NO.
v
Q
t-1 l ?
,AV
Y�y
z
2
UPI
�wT
L, 4 w o. o 4o
iF
TCto L�c o.-
Q.%

A\
DATE
Plaza -
WHD
Storm Outlet Structure
FES No.=
Wet. 2
Q10/Qfull = 0.73
Pipe Dia=
36
in
Mfull = 1.09
Q50 =
103.90
cfs
V = 22.0 fps
Qfull =
142.00
cfs
Vfull =
20.20
fps
From Fig.
8.06.b.1:
Zone
= 3
From Fig. 8.06.b.2:
7
IBLeroLF _�
D5o
= 10 in
DMAx
= 15 in
Riprap Class
= 1
Apron Thickness
= 22.5 in
Apron Length
= 24.0 ft
Apron Width = 3xDia
= 9 ft
s:\1351\0001\calcs\39505 wetlands no 2-Outlet.XLS LATEST REVISION: 4/26/2007 2:48 PM PAGE 1 OF 1

GFD - Louisburg, NC
D.A. Nos. 36
Pocket Wetlands No. 1
Drainage Area
4.02 acres
Soil Type
WeC, WeB
Hydrologic Soil Group
B
Land Use
C
Wooded
0.2
Impervious
0.95
Grass/Open Space
0.22
Imperviousness (%)
68.9
Total Acreage
Composite C
0.72
Composite CN
86
g
h
1-year
104
18
2-year
132
18
10-year
195
22
25-year
232
23
50-year
261
24
100-year
290
25
1-year
2-year
10-year
25-year
50-year
100-year
175,111 sq, ft,
Acreage
0
2.77
1.25
M%
P (in)
3
3.60
5.38
6.41
c=
T21
A=
8.00
H=
L=
Time of Concentration
tc=
CN=
S=
5/11/2007
whd
39505
CN
60
98
61
0.72
4.02 acres
37 ft
750 ft
4.07 Min tc= 5
86
1.63
I
Q (actual)
Qp
W
Tp
(in/hr)
(cfs)
(cfs)
(in)
(min)
(actual)
4.52
13.1
13.1
1.66
22.1
5.74
16.7
16.7
2.19
22.9
7.22
21.0
21.0
3.82
31.9
8.29
24.1
24.1
4.80
34.9
9.00
26.2
26.2
5.57
37.2
9.67
28.1
28.1
6.33
39.4
1

O'DRIEN 6 GERE
SUBJECT:
1::�Uv-f-��E
PAGE:
W�
BY:
DATE:
JOB NUMBER:/
f _, % , \
V�
K I,-)If
77 nG.
/ c-.
,,�_ 10 C)
�•-�� Pam.
e O Z n�-•
Cn 9,D . 9 " 1
Table 2.3 Surface Area to Drainage Area Ratios for Sizing Pocket Wetlands
Imperviousness (%) SAMA (%)
-:a— < 70
0.75
70
0.80
75
0.85
80
0.91
85
0.96
90
1.02
95
1.07
100
1.12
{'( s'f r,t ,_�-�' %von �2t r. •� p,'S° Y__ o ,

U-i4-
Pocket Wetlands No. 1
Permanent Pool Surface Area Required
Impervious Area (Acres) 2.77
% Impervious 68.9
% Impervious Cover from Table 2.3 0.75
Permanent Pool Area (Acres) 0.03
Permanent Pool Area (Sq. Ft.) 1,313
Temp. Pool Volume and Surface Area Req.
Temp. Runoff Volume, Rv (in/in)
0.67
Temp, Pool Volume (acre-feet)
0.2
Temp. Pool Volume (cubic feet)
9,779
Temp. Pool Volume (acre -inches)
2.7
Temp. Pool Depth (inches)
12
Temp. Pool Area (acres)
0.22
Overflow Weir
Orifice
Cw= 3 Orifice Diameter, d (in)=
L= 20 ft. Number, n=
Q50= 26.2 cfs Coefficient, Cd=
H= 0.57 ft. Area, a (sq. ft.)=
Drawdown Rate, Qr (cfs)=
Time to Drawdown, T (days)=
2
1
0.3
0.02
0.04
3.0
OK
2

=- G'DRIEN E GERE
1< <6� 20
N065AR�
O'SRIE5 GERE'B O
SUBJECT
SHEET
BY
DATE
JOB NO.
14,
/
.
1116//
/2.
lJ //' 2 5F
/S-

GGRIEN 5 GERE
O'BRIE42466GERE`1i O�OO�5ARV
SUBJECT
SHEET
BY
DATE
JOB NO.
?v"I I
4u
Q,� a
�
I��IO

IS
(new/Subcat)
(new Pond)
Subcat Reach Z Pon Link:

4 `3
pocket wetlands no 1 41307 Rainfall Duration=30 min, lnten=9.00 in/hr
Prepared by O'BRIEN & GERE Page 2
HydroCAD® 7.00 s/n 003332 © 1986-2003 Applied Microcomputer Systems 5/16/2007
Time span=0.00-3.00 hrs, dt=0.01 hrs, 301 points
Runoff by Rational method, Rise/Fall=1.0/1.0 xTc
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment 1S: (new Subcat) Runoff Area=4.020 ac Runoff Depth=3.24"
Tc=5.0 min C=0.72 Runoff=26.27 cfs 1.085 of
Pond 2P: (new Pond) Peak Elev=278.61' Storage=11,563 cf Inflow=26.27 cfs 1.085 of
Primary=0.06 cfs 0.013 of Secondary=26.20 cfs 0.952 of Outflow=26.26 cfs 0.965 of
Total Runoff Area = 4.020 ac Runoff Volume = 1.085 of Average Runoff Depth = 3.24"

49
pocket wetlands no 1 41307 Rainfall Duration=30 min, Inten=9.00 in/hr
Prepared by O'BRIEN & GERE Page 3
HydroCAD® 7.00 s/n 003332 © 1986-2003 Applied Microcomputer Systems 5/16/2007
Subcatchment 1S: (new Subcat)
Runoff = 26.27 cfs @ 0.09 hrs, Volume= 1.085 af, Depth= 3.24"
Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs
Rainfall Duration=30 min, Inten=9.00 in/hr
Area (ac) C Description
4.020 0.72
Tc Length
cfs
Description
5.0 Direct Entry,
2-
s
Subcatchment 1S: (new Subcat)
Hydrograph
Rainfall
Duration=30 min,
Inten=9.00 in/hr
Runoff Area=4.020 ac
Runoff Volume=1.085 of
Runoff Depth=3.24"
Tc=5.0 min
C=0.72
Time (hours)
2
— Runoff

pocket wetlands no 1 41307 Rainfall Duration=30 min, lnten=9.00 in/hr
Prepared by O'BRIEN & GERE Page 4
HydroCADO 7.00 s/n 003332 © 1986-2003 Applied Microcomputer Systems 5/16/2007
Time Runoff
(hours) (cfs)
0.00 0.00
0.02 6.30
0.04 12.61
0.06 18.91
0.08 25.22
0.10 26.27
0.12 26.27
0.14 26.27
0.16 26.27
0.18 26.27
0.20 26.27
0.22 26.27
0.24 26.27
0.26 26.27
0.28 26.27
0.30 26.27
0.32 26.27
0.34 26.27
0.36 26.27
0.38 26.27
0.40 26.27
0.42 26.27
0.44 26.27
0.46 26.27
0.48 26.27
0.50 26.27
0.52 19.96
0.54 13.66
0.56 7.35
0.58 1.05
0.60 0.00
0.62 0.00
0.64 0.00
0.66 0.00
0.68 0.00
0.70 0.00
0.72 0.00
0.74 0.00
0.76 0.00
0.78 0.00
0.80 0.00
0.82 0.00
0.84 0.00
0.86 0.00
0.88 0.00
0.90 0.00
0.92 0.00
0.94 000
0.96 0.00
0.98 0.00
1.00 000
1.02 0.00
Hydrograph for Subcatchment 1S: (new Subcat)
Time Runoff
(hours) (cfs)
1.04 0.00
1.06 0.00
1.08 0.00
1.10 0.00
1.12 0.00
1.14 0.00
1.16 0.00
1.18 0.00
1.20 0.00
1.22 0.00
1.24 0.00
1.26 0.00
1.28 0.00
1.30 0.00
1.32 0.00
1.34 0.00
1.36 0.00
1.38 0.00
1.40 0.00
1.42 0.00
1.44 0.00
1.46 0.00
1.48 0.00
1.50 0.00
1.52 0.00
1.54 0.00
1.56 0.00
1.58 0.00
1.60 0.00
1.62 0.00
1.64 0.00
1.66 0.00
1.68 0.00
1.70 0.00
1.72 0.00
1.74 0.00
1.76 0.00
1.78 0.00
1.80 0.00
1.82 0.00
1.84 0.00
1.86 0.00
1.88 0.00
1.90 0.00
1.92 0.00
1.94 0.00
1.96 0.00
1.98 0.00
2.00 0.00
2.02 0.00
2.04 0.00
2.06 0.00
Time Runoff
(hours) (cfs)
2.08 0.00
2.10 0.00
2.12 0.00
2.14 0.00
2.16 0.00
2.18 0.00
2.20 0.00
2.22 0.00
2.24 0.00
2.26 0.00
2.28 0.00
2.30 0.00
2.32 0.00
2.34 0.00
2.36 0.00
2.38 0.00
2.40 0.00
2.42 0.00
2.44 0.00
2.46 0.00
2.48 0.00
2.50 0.00
2.52 0.00
2.54 0.00
2.56 0.00
2.58 0.00
2.60 0.00
2.62 0.00
2.64 0.00
2.66 0.00
2.68 0.00
2.70 0.00
2.72 0.00
2.74 0.00
2.76 0.00
2.78 0.00
2.80 0.00
2.82 0.00
2.84 0.00
2.86 0.00
2.88 0.00
2.90 0.00
2.92 0.00
2.94 0.00
2.96 0.00
2.98 0.00
3.00 0.00

Ste/
pocket wetlands no 1 41307 Rainfall Duration=30 min, Inten=9.00 in/hr
Prepared by O'BRIEN & GERE Page 5
HydroCAM 7.00 sin 003332 © 1986-2003 Applied Microcomputer Systems 5/16/2007
Pond 2P: (new Pond)
Inflow Area = 4.020 ac, Inflow Depth = 3.24"
Inflow =
26.27 cfs @
0.09 hrs,
Volume=
1.085 of
Outflow =
26.26 cfs @
0.50 hrs,
Volume=
0.965 af, Atten= 0%, Lag= 24.6 min
Primary =
0.06 cfs @
0.50 hrs,
Volume=
0.013 of
Secondary =
26.20 cfs @
0.50 hrs,
Volume=
0.952 of
Routing by Stor-Ind method, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs
Peak Elev= 278.61'
@ 0.50 hrs Surf.Area= 10,044 sf Storage= 11,563 cf
Plug -Flow detention
time= 8.2 min calculated for 0.962 of (89% of inflow)
Center -of -Mass det.
time= 6.9 min ( 24.4 - 17.5 )
# Invert
Avail.Storage Storage Description
1 277.00'
38,818 cf Custom Stage Data (Prismatic) Listed below
Elevation Surf.Area
Inc.Store Cum.Store
(feet)
(sq-ft) (cubic -feet) (cubic -feet)
277.00
1,570 0 0
278.00
9,450 5,510 5,510
279.00
10,425 9,938 15,448
280.00
11,662 11,044 26,491
281.00
12,991 12,327 38,818
# Routino
Invert Outlet Devices
1 Primary 277.00' 2.0" Vert. Orifice/Grate C= 0.300
2 Secondary 278.00' 20.0' long x 1.0' breadth Broad -Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50
3.00
Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31
3.32
Primary OutFlow Max=0.06 cfs @ 0.50 hrs HW=278.61' (Free Discharge)
t-1=Orifice/Grate (Orifice Controls 0.06 cfs @ 3.0 fps)
Secondary OutFlow Max=26.19 cfs @ 0.50 hrs HW=278.61' (Free Discharge)
t-2=Broad-Crested Rectangular Weir (Weir Controls 26.19 cfs @ 2.1 fps)

S Z
pocket wetlands no 1 41307 Rainfall Duration=30 min, Inten=9.00 in/hr
Prepared by O'BRIEN & GERE Page 6
HydroCADO 7.00 s/n 003332 O 1986-2003 Applied Microcomputer Systems 5/16/2007
N
U
2
LL
7
a
Pond 2P: (new Pond)
Hydrograph
Inflow Area=4.020 ac
Peak Elev=278.61'
Storage=11,563 cf
Time (hours)
Pond 2P: (new Pond)
Stage -Discharge
Discharge (cfs)
- Inflow
— Outflow
— Primary
— Secondary
— Total
— Primary
— Secondary

53
pocket wetlands no 1 41307 Rainfall Duration=30 min, Inten=9.00 in/hr
Prepared by O'BRIEN & GERE Page 7
HydroCAD® 7.00 s/n 003332 © 1986-2003 Applied Microcomputer Systems 5/16/2007
a
w
Pond 2P: (new Pond)
Stage -Area -Storage
Storage (cubic -feet)
Surface
Storage

5
pocket wetlands no 141307 Rainfall Duration=30 min, Inten=9.00 in/hr
Prepared by O'BRIEN & GERE Page 8
HydroCAD® 7.00 s/n 003332 © 1986-2003 Applied Microcomputer Systems 5/16/2007
Hydrograph for Pond 2P: (new Pond)
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
277.00
0.00
0.00
0.00
0.10
26.27
5,496
278.00
0.05
0.05
0.00
0.20
26.27
10,793
278.53
21.31
0.06
21.25
0.30
26.27
11,496
278.60
25.79
0.06
25.72
0.40
26.27
11,558
278.61
26.23
0.06
26.16
0.50
26.27
11,563
278.61
26.26
0.06
26.20
0.60
0.00
8,596
278.31
9.44
0.06
9.38
0.70
0.00
6,789
278.13
2.55
0.05
2.50
0.80
0.00
6,195
278.07
1.05
0.05
1.00
0.90
0.00
5,924
278.04
0.52
0.05
0.46
1.00
0.00
5,775
278.03
0.34
0.05
0.29
1.10
0.00
5,674
278.02
0.23
0.05
0.18
1.20
0.00
5,606
278.01
0.15
0.05
0.10
1.30
0.00
5,560
278.01
0.10
0.05
0.05
1.40
0.00
5,529
278.00
0.07
0.05
0.02
1.50
0.00
5,508
278.00
0.05
0.05
0.00
1.60
0.00
5,490
278.00
0.05
0.05
0.00
1.70
0.00
5,472
277.99
0.05
0.05
0.00
1.80
0.00
5,454
277.99
0.05
0.05
0.00
1.90
0.00
5,436
277.99
0.05
0.05
0.00
2.00
0.00
5,418
277.98
0.05
0.05
0.00
2.10
0.00
5,400
277.98
0.05
0.05
0.00
2.20
0.00
5,382
277.98
0.05
0.05
0.00
2.30
0.00
5,364
277.97
0.05
0.05
0.00
2.40
0.00
5,346
277.97
0.05
0.05
0.00
2.50
0.00
5,328
277.97
0.05
0.05
0.00
2.60
0.00
5,311
277.96
0.05
0.05
0.00
2.70
0.00
5,293
277.96
0.05
0.05
0.00
2.80
0.00
5,275
277.96
0.05
0.05
0.00
2.90
0.00
5,258
277.95
0.05
0.05
0.00
3.00
0.00
5,240
277.95
0.05
0.05
0.00

pocket wetlands no 141307 Rainfall Duration=30 min, lnten=9.00 in/hr
Prepared by O'BRIEN & GERE Page 9
HydroCADO 7.00 s/n 003332 © 1986-2003 Applied Microcomputer Systems 5/16/2007
Stage -Discharge for Pond 2P: (new Pond)
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
277.00
0.00
0.00
0.00
277.05
0.00
0.00
0.00
277.10
0.01
0.01
0.00
277.15
0.01
0.01
0.00
277.20
0.02
0.02
0.00
277.25
0.02
0.02
0.00
277.30
0.02
0.02
0.00
277.35
0.03
0.03
0.00
277.40
0.03
0.03
0.00
277.45
0.03
0.03
0.00
277.50
0.03
0.03
0.00
277.55
0.04
0.04
0.00
277.60
0.04
0.04
0.00
277.65
0.04
0.04
0.00
277.70
0.04
0.04
0.00
277.75
0.04
0.04
0.00
277.80
0.04
0.04
0.00
277.85
0.05
0.05
0.00
277.90
0.05
0.05
0.00
277.95
0.05
0.05
0.00
278.00
0.05
0.05
0.00
278.05
0.65
0.05
0.60
278.10
1.75
0.05
1.70
278.15
3.18
0.05
3.13
278.20
4.87
0.06
4.81
278.25
6.80
0.06
6.74
278.30
8.95
0.06
8.89
278.35
11.29
0.06
11.23
278.40
13.82
0.06
13.76
278.45
16.53
0.06
16.47
278.50
19.40
0.06
19.34
278.55
22.44
0.06
22.37
278.60
25.63
0.06
25.56
278.65
29.15
0.07
29.08
278.70
32.86
0.07
32.80
278.75
36.77
0.07
36.70
278.80
40.85
0.07
40.79
278.85
45.25
0.07
45.18
278.90
49.85
0.07
49.78
278.95
54.66
0.07
54.58
279.00
59.67
0.07
59.60
279.05
64.74
0.07
64.66
279.10
69.99
0.07
69.91
279.15
75.43
0.08
75.35
279.20
81.05
0.08
80.98
279.25
87.00
0.08
86.93
279.30
93.16
0.08
93.08
279.35
99.53
0.08
99.45
279.40
106.10
0.08
106.02
279.45
112.53
0.08
112.44
279.50
119.13
0.08
119.05
279.55
125.90
0.08
125.82
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
279.60
132.85
0.08
132.77
279.65
139.44
0.08
139.35
279.70
146.15
0.08
146.07
279.75
152.99
0.09
152.91
279.80
159.96
0.09
159.87
279.85
166.54
0.09
166.45
279.90
173.20
0.09
173.11
279.95
179.94
0.09
179.86
280.00
186.77
0.09
186.68
280.05
193.87
0.09
193.78
280.10
201.06
0.09
200.97
280.15
208.35
0.09
208.26
280.20
215.72
0.09
215.63
280.25
223.18
0.09
223.09
280.30
230.73
0.09
230.63
280.35
238.36
0.09
238.27
280.40
246.08
0.10
245.99
280.45
253.89
0.10
253.79
280.50
261.78
0.10
261.68
280.55
269.75
0.10
269.65
280.60
277.80
0.10
277.70
280.65
285.94
0.10
285.84
280.70
294.15
0.10
294.05
280.75
302.45
0.10
302.35
280.80
310.83
0.10
310.73
280.85
319.29
0.10
319.19
280.90
327.82
0.10
327.72
280.95
336.44
0.10
336.33
281.00
345.13
0.10
345.02

5�
pocket wetlands no 1 41307 Rainfall Duration=30 min, Inten=9.00 in/hr
Prepared by O'BRIEN & GERE Page 10
HydroCADO 7.00 s/n 003332 O 1986-2003 Applied Microcomputer Systems 5/16/2007
Stage -Area -Storage for Pond 2P: (new Pond)
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
277.00
1,570
0
277.05
1,964
276
277.10
2,358
551
277.15
2,752
826
277.20
3,146
1,102
277.25
3,540
1,378
277.30
3,934
1,653
277.35
4,328
1,929
277.40
4,722
2,204
277.45
5,116
2,479
277.50
5,510
2,755
277.55
5,904
3,031
277.60
6,298
3,306
277.65
6,692
3,581
277.70
7,086
3,857
277.75
7,480
4,133
277.80
7,874
4,408
277.85
8,268
4,684
277.90
8,662
4,959
277.95
9,056
5,234
278.00
9,450
5,510
278.05
9,499
6,007
278.10
9,548
6,504
278.15
9,596
7,001
278.20
9,645
7,497
278.25
9,694
7,994
278.30
9,743
8,491
278.35
9,791
8,988
278.40
9,840
9,485
278.45
9,889
9,982
278.50
9,938
10,479
278.55
9,986
10,976
278.60
10,035
11,473
278.65
10,084
11,969
278.70
10,132
12,466
278.75
10,181
12,963
278.80
10,230
13,460
278.85
10,279
13,957
278.90
10,327
14,454
278.95
10,376
14,951
279.00
10,425
15,448
279.05
10,487
16,000
279.10
10,549
16,552
279.15
10,611
17,104
279.20
10,672
17,656
279.25
10,734
18,208
279.30
10,796
18,761
279.35
10,858
19,313
279.40
10,920
19,865
279.45
10,982
20,417
279.50
11,044
20,969
279.55
11,105
21,521
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
279.60
11,167
22,074
279.65
11,229
22,626
279.70
11,291
23,178
279.75
11,353
23,730
279.80
11,415
24,282
279.85
11,476
24,834
279.90
11,538
25,387
279.95
11,600
25,939
280.00
11,662
26,491
280.05
11,728
27,107
280.10
11,795
27,724
280.15
11,861
28,340
280.20
11,928
28,956
280.25
11,994
29,573
280.30
12,061
30,189
280.35
12,127
30,805
280.40
12,194
31,422
280.45
12,260
32,038
280.50
12,327
32,654
280.55
12,393
33,271
280.60
12,459
33,887
280.65
12,526
34,503
280.70
12,592
35,120
280.75
12,659
35,736
280.80
12,725
36,352
280.85
12,792
36,969
280.90
12,858
37,585
280.95
12,925
38,201
281.00
12,991
38,818

5-7
GFD - Louisburg, NC
D.A. Nos. 37
Pocket Wetlands No. 2
Drainage Area
2.78 acres
Soil Type
WeC, WeB
Hydrologic Soil Group
B
Land Use
C
Wooded
0.2
Impervious
0.95
Grass/Open Space
0.22
Imperviousness (%)
73.7
Total Acreage
Composite C
0.76
Composite CN
88
g
h
1-year
104
18
2-year
132
18
10-year
195
22
25-year
232
23
50-year
261
24
100-year
290
25
5/11 /2007
whd
39505
121,097 sq, ft.
Acreage CN
0 60
2.05 98
0.73 61
2.78
P (in)
3
3.60
5.38
6.41
c=
7.21
A=
8.00
H=
L=
Time of Concentration
tc=
CN=
S=
0.76
2.78 acres
17 ft
600 ft
4.24 Min tc= 5
88
1.36
I
Q (actual)
Qp
Q`
Tp
(in/hr)
(cfs)
(cfs)
(in)
(min)
(actual)
1-year
4.52
9.5
9.5
1.82
23.1
2-year
5.74
12.1
12.1
2.36
23.6
10-year
7.22
15.2
15.2
4.03
32.0
25-year
8.29
17.5
17.5
5.02
34.8
50-year
9.00
19.0
19.0
5.80
37.0
100-year
9.67
20.4
20.4
6.57
39.0
1

GBRICN E GERE
SUBJECT:
PAGE:
BY:
DATE:
JOB NUMBER:
1 l
�2
I l.)ki=,
T>
,:�, , -__ P ✓., ,G a . 3
;�?- , o<, �-,c.
0- 0-:2 'Lc-.

J1
Pocket Wetlands No. 2
Permanent Pool Surface Area Required
Impervious Area (Acres) 2.05
% Impervious 73.7
% Impervious Cover from Table 2.3 0.85
Permanent Pool Area (Acres) 0.02
Permanent Pool Area (Sq. Ft.) 1,029
Temp. Pool Volume & Surface Area Req.
Temp. Runoff Volume, Rv (in/in) 0.71
Temp. Pool Volume (acre-feet) 0.2
Temp. Pool Volume (cubic feet) 7,202
Temp. Pool Volume (acre -inches) 2.0
Temp. Pool Depth (inches) 12
Temp. Pool Area (acres) 0.17
Overflow Weir
Orifice
Cw= 3 Orifice Diameter, d (in)=
L= 20 ft. Number, n=
Q50= 19.0 cfs Coefficient, Cd=
H= 0.46 ft. Area, a (sq. ft.)=
Drawdown Rate, Qr (cfs)=
Time to Drawdown, T (days)=
2
1
0.3
0.02
0.04
2.2
OK
I]

2 m 2 OBm[N 6GERE
_. ./� \j�
SUBJECT
em
By
m.
,
60
«:
&[9\!
4
: 77�

GBRIEN 6 GERE
1 415 2006
O'BRIEN Ei GERE'B BOTH ANNIVERSARY
SUBJECT
SHEET
BY
DATE
JOB NO.
i
l i 7.
z_
qC-

La L
1S
(new ubcat)
2P
(new Pond)
OSubcat Reach Pond' Link; Drainage Diagram for pocket wetlands no 2 41307
-� Prepared by O'BRIEN & GERE 5/16/2007
HydroCAD® 7.00 sm 003332 ©1986-2003 Applied Microcomputer Systems

G3
pocket wetlands no 2 41307 Rainfall Duration=30 min, Inten=9.00 in/hr
Prepared by O'BRIEN & GERE Page 2
HydroCADO 7.00 s/n 003332 O 1986-2003 Applied Microcomputer Systems 5/16/2007
Time span=0.00-3.00 hrs, dt=0.01 hrs, 301 points
Runoff by Rational method, Rise/Fall=1.0/1.0 xTc
Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method
Subcatchment 1S: (new Subcat) Runoff Area=2.780 ac Runoff Depth=3.42"
Tc=5.0 min C=0.76 Runoff=19.17 cfs 0.792 of
Pond 2P: (new Pond) Peak Elev=264.50' Storage=8,860 cf Inflow=19.17 cfs 0.792 of
Primary=0.06 cfs 0.013 of Secondary=19.11 cfs 0.680 of Outflow=19.17 cfs 0.692 of
Total Runoff Area = 2.780 ac Runoff Volume = 0.792 of Average Runoff Depth = 3.42"

L0 L�
pocket wetlands no 2 41307 Rainfall Duration=30 min, Inten=9.00 in/hr
Prepared by O'BRIEN & GERE Page 3
HydroCADO 7.00 s/n 003332 © 1986-2003 Applied Microcomputer Systems 5/16/2007
Subcatchment 1S: (new Subcat)
Runoff = 19.17 cfs @ 0.09 hrs, Volume= 0.792 af, Depth= 3.42"
Runoff by Rational method, Rise/Fall=1.0/1.0 xTc, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs
Rainfall Duration=30 min, Inten=9.00 in/hr
Area (ac) C Description
2.780 0.76
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
N
U
0
0
U.
Subcatchment 1S: (new Subcat)
Hydrograph
Rainfall
Duration=30 min,
Inten=9.00 in/hr
Runoff Area=2.780 ac
Runoff Volume=0.792 of
Time (hours)
Runoff Depth=3.42"
Tc=5.0 min
C=0.76
— Runofl

pocket wetlands no 2 41307 Rainfall Duration=30 min, Inten=9.00 in/hr
Prepared by O'BRIEN & GERE Page 4
HydroCAD® 7.00 s/n 003332 © 1986-2003 Applied Microcomputer Systems 5/16/2007
Time Runoff
(hours) (Cfs)
0.00 0.00
0.02 4.60
0.04 9.20
0.06 13.81
0.08 18.41
0.10 19.17
0.12 19.17
0.14 19.17
0.16 19.17
0.18 19.17
0.20 19.17
0.22 19.17
0.24 19.17
0.26 19.17
0.28 19.17
0.30 19.17
0.32 19.17
0.34 19.17
0.36 19.17
0.38 19.17
0.40 19.17
0.42 19.17
0.44 19.17
0.46 19.17
0.48 19.17
0.50 19.17
0.52 14.57
0.54 9.97
0.56 5.37
0.58 0.77
0.60 0.00
0.62 0.00
0.64 0.00
0.66 0.00
0.68 0.00
0.70 0.00
0.72 0.00
0.74 0.00
0.76 0.00
0.78 0.00
0.80 0.00
0.82 0.00
0.84 0.00
0.86 0.00
0.88 0.00
0.90 0.00
0.92 0.00
0.94 0.00
0.96 0.00
0.98 0.00
1.00 0.00
1.02 0.00
Hydrograph for Subcatchment 1 S: (new Subcat)
Time Runoff
(hours) (Cfs)
1.04 0.00
1.06 0.00
1.08 0.00
1.10 0.00
1.12 0.00
1.14 0.00
1.16 0.00
1.18 0.00
1.20 0.00
1.22 0.00
1.24 0.00
1.26 0.00
1.28 0.00
1.30 0.00
1.32 0.00
1.34 0.00
1.36 0.00
1.38 0.00
1.40 0.00
1.42 0.00
1.44 0.00
1.46 0.00
1.48 0.00
1.50 0.00
1.52 0.00
1.54 0.00
1.56 0.00
1.58 0.00
1.60 0.00
1.62 0.00
1.64 0.00
1.66 0.00
1.68 0.00
1.70 0.00
1.72 0.00
1.74 0.00
1.76 0.00
1.78 0.00
1.80 O.00
1.82 0.00
1.84 0.00
1.86 0.00
1.88 0.00
1.90 0.00
1.92 0.00
1.94 0.00
1.96 0.00
1.98 0.00
2.00 0.00
2.02 O.00
2.04 O.00
2.06 O.00
Time Runoff
(hours) (Cfs)
2.08 0.00
2.10 0.00
2.12 0.00
2.14 0.00
2.16 0.00
2.18 0.00
2.20 0.00
2.22 0.00
2.24 0.00
2.26 0.00
2.28 0.00
2.30 0.00
2.32 0.00
2.34 0.00
2.36 0.00
2.38 0.00
2.40 0.00
2.42 0.00
2.44 0.00
2.46 0.00
2.48 0.00
2.50 0.00
2.52 0.00
2.54 0.00
2.56 0.00
2.58 0.00
2.60 0.00
2.62 0.00
2.64 0.00
2.66 0.00
2.68 0.00
2.70 0.00
2.72 0.00
2.74 0.00
2.76 0.00
2.78 0.00
2.80 0.00
2.82 0.00
2.84 0.00
2.86 0.00
2.88 0.00
2.90 0.00
2.92 0.00
2.94 0.00
2.96 0.00
2.98 0.00
3.00 0.00

OG
pocket wetlands no 2 41307 Rainfall Duration=30 min, Inten=9.00 in/hr
Prepared by O'BRIEN & GERE Page 5
HydroCADO 7.00 s/n 003332 © 1986-2003 Applied Microcomputer Systems 5/16/2007
Pond 2P: (new Pond)
Inflow Area =
2.780 ac,
Inflow Depth
= 3.42"
Inflow =
19.17 cfs @
0.09 hrs,
Volume=
0.792 of
Outflow =
19.17 cfs @
0.50 hrs,
Volume=
0.692 af, Atten= 0%, Lag= 24.6 min
Primary =
0.06 cfs @
0.50 hrs,
Volume=
0.013 of
Secondary =
19.11 cfs @
0.50 hrs,
Volume=
0.680 of
Routing by Stor-Ind method, Time Span= 0.00-3.00 hrs, dt= 0.01 hrs
Peak Elev= 264.50' @ 0.50 hrs Surf.Area= 8,468 sf Storage= 8,860 cf
Plug -Flow detention time= 9.1 min calculated for 0.692 of (87% of inflow)
Center -of -Mass det. time= 7.2 min ( 24.7 - 17.5 )
# Invert
Avail.Storage
Storage Description
1 263.00'
33,391 cf
Custom Stage
Data (Prismatic) Listed below
Elevation
Surf.Area
Inc.Store
Cum.Store
(feet)
(sq-ft)
(cubic -feet)
(cubic -feet)
263.00
1,334
0
0
264.00
7,983
4,659
4,659
265.00
8,961
8,472
13,131
266.00
10,102
9,532
22,662
267.00
11,356
10,729
33,391
Invert Outlet Devices
1 Primary 263.00' 2.0" Vert. Orifice/Grate C= 0.300
2 Secondary 264.00' 20.0' long x 1.0' breadth Broad -Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50
3.00
Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31
3.32
Primary OutFlow Max=0.06 cfs @ 0.50 hrs HW=264.50' (Free Discharge)
L1=Orifice/Grate (Orifice Controls 0.06 cfs @ 2.9 fps)
Secondary OutFlow Max=19.10 cfs @ 0.50 hrs HW=264.50' (Free Discharge)
L2=Broad-Crested Rectangular Weir (Weir Controls 19.10 cfs @ 1.9 fps)

(1-7
pocket wetlands no 2 41307 Rainfall Duration=30 min, lnten=9.00 in/hr
Prepared by O'BRIEN & GERE Page 6
Hydro CAD® 7.00 s/n 003332 © 1986-2003 Applied Microcomputer Systems 5/16/2007
N
U
3
LL:
Pond 2P:(new Pond)
Hydrograph
2
2J9.17 cis 19.11cfs
19
18-1 Inflow Area=2.780 ac
17-
15: Peak Elev=264.50'
14-
13- Storage=8,860 cf
--
12°
11'
10:
9-
8-
7_
6-
6'
4-
3-
2-
1 LLPip
0"
0 2 3
Time (hours)
Pond 2P: (new Pond)
Stage -Discharge
Discharge lets)
— Inflow
— Outflow
— Primary
— Secondary
— Total
— Primary
— Secondary

6's
pocket wetlands no 2 41307
Prepared by O'BRIEN & GERE
u
ry
Rainfall Duration=30 min, Inten=9.00 in/hr
Page 7
Pond 2P:(new Pond)
Stage -Area -Storage
SurfacOlofHzontal'Wetted Area (sq-ft7
Storage (cubic -feet)
_Surface
Storage

t,9
pocket wetlands no 2 41307 Rainfall Duration=30 min, Inten=9.00 in/hr
Prepared by O'BRIEN & GERE Page 8
HydroCAD® 7.00 s/n 003332 © 1986-2003 Applied Microcomputer Systems 5/16/2007
Hydrograph for Pond 2P: (new Pond)
Time
Inflow
Storage
Elevation
Outflow
Primary
Secondary
(hours)
(cfs)
(cubic -feet)
(feet)
(cfs)
(cfs)
(cfs)
0.00
0.00
0
263.00
0.00
0.00
0.00
0.10
19.17
4,010
263.86
0.05
0.05
0.00
0.20
19.17
8,260
264.43
15.17
0.06
15.11
0.30
19.17
8,810
264.49
18.83
0.06
18.76
0.40
19.17
8,856
264.50
19.15
0.06
19.08
0.50
19.17
8,860
264.50
19.17
0.06
19.11
0.60
0.00
6,740
264.25
6.63
0.06
6.58
0.70
0.00
5,491
264.10
1.74
0.05
1.68
0.80
0.00
5,091
264.05
0.70
0.05
0.65
0.90
0.00
4,912
264.03
0.37
0.05
0.32
1.00
0.00
4,804
264.02
0.24
0.05
0.19
1.10
0.00
4,736
264.01
0.15
0.05
0.10
1.20
0.00
4,693
264.00
0.09
0.05
0.04
1.30
0.00
4,666
264.00
0.06
0.05
0.01
1.40
0.00
4,647
264.00
0.05
0.05
0.00
1.50
0.00
4,629
263.99
0.05
0.05
0.00
1.60
0.00
4,611
263.99
0.05
0.05
0.00
1.70
0.00
4,593
263.99
0.05
0.05
0.00
1.80
0.00
4,575
263.98
0.05
0.05
0.00
1.90
0.00
4,557
263.98
0.05
0.05
0.00
2.00
0.00
4,539
263.97
0.05
0.05
0.00
2.10
0.00
4,522
263.97
0.05
0.05
0.00
2.20
0.00
4,504
263.97
0.05
0.05
0.00
2.30
0.00
4,486
263.96
0.05
0.05
0.00
2.40
0.00
4,468
263.96
0.05
0.05
0.00
2.50
0.00
4,451
263.96
0.05
0.05
0.00
2.60
0.00
4,433
263.95
0.05
0.05
0.00
2.70
0.00
4,415
263.95
0.05
0.05
0.00
2.80
0.00
4,398
263.94
0.05
0.05
0.00
2.90
0.00
4,380
263.94
0.05
0.05
0.00
3.00
0.00
4,363
263.94
0.05
0.05
0.00

-7,0
pocket wetlands no 2 41307 Rainfall Duration=30 min, Inten=9.00 in/hr
Prepared by O'BRIEN & GERE Page 9
HydroCADO 7.00 s/n 003332 O 1986-2003 Applied Microcomputer Systems 5/1612007
Stage -Discharge for Pond 2P: (new Pond)
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
263.00
0.00
0.00
0.00
263.05
0.00
0.00
0.00
263.10
0.01
0.01
0.00
263.15
0.01
0.01
0.00
263.20
0.02
0.02
0.00
263.25
0.02
0.02
0.00
263.30
0.02
0.02
0.00
263.35
0.03
0.03
0.00
263.40
0.03
0.03
0.00
263.45
0.03
0.03
0.00
263.50
0.03
0.03
0.00
263.55
0.04
0.04
0.00
263.60
0.04
0.04
0.00
263.65
0.04
0.04
0.00
263.70
0.04
0.04
0.00
263.75
0.04
0.04
0.00
263.80
0.04
0.04
0.00
263.85
0.05
0.05
0.00
263.90
0.05
0.05
0.00
263.95
0.05
0.05
0.00
264.00
0.05
0.05
0.00
264.05
0.65
0.05
0.60
264.10
1.75
0.05
1.70
264.15
3.18
0.05
3.13
264.20
4.87
0.06
4.81
264.25
6.80
0.06
6.74
264.30
8.95
0.06
8.89
264.35
11.29
0.06
11.23
264.40
13.82
0.06
13.76
264.45
16.53
0.06
16.47
264.50
19.40
0.06
19.34
264.55
22.44
0.06
22.37
264.60
25.63
0.06
25.56
264.65
29.15
0.07
29.08
264.70
32.86
0.07
32.80
264.75
36.77
0.07
36.70
264.80
40.85
0.07
40.79
264.85
45.25
0.07
45.18
264.90
49.85
0.07
49.78
264.95
54.66
0.07
54.58
265.00
59.67
0.07
59.60
265.05
64.74
0.07
64.66
265.10
69.99
0.07
69.91
265.15
75.43
0.08
75.35
265.20
81.05
0.08
80.98
265.25
87.00
0.08
86.93
265.30
93.16
0.08
93.08
265.35
99.53
0.08
99.45
265.40
106.10
0.08
106.02
265.45
112.53
0.08
112.44
265.50
119.13
0.08
119.05
265.55
125.90
0.08
125.82
Elevation Discharge Primary Secondary
(feet)
(cfs)
(cfs)
(cfs)
265.60
132.85
0.08
132.77
265.65
139.44
0.08
139.35
265.70
146.15
0.08
146.07
265.75
152.99
0.09
152.91
265.80
159.96
0.09
159.87
265.85
166.54
0.09
166.45
265.90
173.20
0.09
173.11
265.95
179.94
0.09
179.86
266.00
186.77
0.09
186.68
266.05
193.87
0.09
193.78
266.10
201.06
0.09
200.97
266.15
208.35
0.09
208.26
266.20
215.72
0.09
215.63
266.25
223.18
0.09
223.09
266.30
230.73
0.09
230.63
266.35
238.36
0.09
238.27
266.40
246.08
0.10
245.99
266.45
253.89
0.10
253.79
266.50
261.78
0.10
261.68
266.55
269.75
0.10
269.65
266.60
277.80
0.10
277.70
266.65
285.94
0.10
285.84
266.70
294.15
0.10
294.05
266.75
302.45
0.10
302.35
266.80
310.83
0.10
310.73
266.85
319.29
0.10
319.19
266.90
327.82
0.10
327.72
266.95
336.44
0.10
336.33
267.00
345.13
0.10
345.02

-71
pocket wetlands no 2 41307 Rainfall Duration=30 min, Inten=9.00 in/hr
Prepared by O'BRIEN & GERE Page 10
HydroCAD® 7.00 s/n 003332 © 1986-2003 Applied Microcomputer Systems 5/16/2007
Stage -Area -Storage for Pond 2P:(new Pond)
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
263.00
1,334
0
263.05
1,666
233
263.10
1,999
466
263.15
2,331
699
263.20
2,664
932
263.25
2,996
1,165
263.30
3,329
1,398
263.35
3,661
1,630
263.40
3,994
1,863
263.45
4,326
2,096
263.50
4,659
2,329
263.55
4,991
2,562
263.60
5,323
2,795
263.65
5,656
3,028
263.70
5,988
3,261
263.75
6,321
3,494
263.80
6,653
3,727
263.85
6,986
3,960
263.90
7,318
4,193
263.95
7,651
4,426
264.00
7,983
4,659
264.05
8,032
5,082
264.10
8,081
5,506
264.15
8,130
5,929
264.20
8,179
6,353
264.25
8,228
6,777
264.30
8,276
7,200
264.35
8,325
7,624
264.40
8,374
8,047
264.45
8,423
8,471
264.50
8,472
8,895
264.55
8,521
9,318
264.60
8,570
9,742
264.65
8,619
10,165
264.70
8,668
10,589
264.75
8,717
11,013
264.80
8,765
11,436
264.85
8,814
11,860
264.90
8,863
12,283
264.95
8,912
12,707
265.00
8,961
13,131
265.05
9,018
13,607
265.10
9,075
14,084
265.15
9,132
14,560
265.20
9,189
15,037
265.25
9,246
15,513
265.30
9,303
15,990
265.35
9,360
16,467
265.40
9,417
16,943
265.45
9,474
17,420
265.50
9,532
17,896
265.55
9,589
18,373
Elevation
Surface
Storage
(feet)
(sq-ft)
(cubic -feet)
265.60
9,646
18,849
265.65
9,703
19,326
265.70
9,760
19,803
265.75
9,817
20,279
265.80
9,874
20,756
265.85
9,931
21,232
265.90
9,988
21,709
265.95
10,045
22,185
266.00
10,102
22,662
266.05
10,165
23,198
266.10
10,227
23,735
266.15
10,290
24,271
266.20
10,353
24,808
266.25
10,416
25,344
266.30
10,478
25,881
266.35
10,541
26,417
266.40
10,604
26,954
266.45
10,666
27,490
266.50
10,729
28,027
266.55
10,792
28,563
266.60
10,854
29,099
266.65
10,917
29,636
266.70
10,980
30,172
266.75
11,043
30,709
266.80
11,105
31,245
266.85
11,168
31,782
266.90
11,231
32,318
266.95
11,293
32,855
267.00
11,356
33,391

O'BRIEN 6 GERE
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rELPREADER OVERVIEW DIAGRAM
HATHAWAY, EXTENSION ASSOCIATE, NC STATE UNIVERSITY
Forebay
Reinforced
Vegetated
Swale
G o,rc.0 re
Channel
L
Level. —
5preader Lip
Level Spreader Design Guidance Final Version: Effective I January 2007
2

O'DRIEN 5 GERE
SUBJECT:
PAGE:
BY:
DATE:
JOB NUMBER:
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I�iCL K S k�C1�.R G' SQESS
n= o.o2s
y= ,al
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T (e2.4 Y 0.g3-F

O'DRIEN S GERE
SUBJECT:
PAGE:
BY:
DATE:
JOB NUMBER:
12 I _ j do
L\�L-9, -7
32�r�?pp
rl = 0•07(-�
zP-7-. 4 v I.Zg' u o •os '�

APPENDIX A
SOILS

Franklin County, North Carolina
Table 15.-Physical and
Chemical Properties of the Soils -Continued
I
I
I
I
I
I
I Erosion 1
Soil name and
IDepthl
Clay
I
Moist
(Permeability
lAvailablel
Soil
IShrink-swell
I factor. I
Organic
map symbol
I I.
I
bulk
I
I
water lreactionl
potential
I I I
matter
I I
density
I
capacity I
I
I R I T I
I In I
Pce
1
g/cc
I
In/hr
In/in I
PH
I
I
Pot
ROA+:
I
I
I
I
I
I
Roanoke ---------
1 0-5 1
30-27
11.20-1.501
0.6-2.0
10.14-0.2013.5-5.5
(Low ----------
10.371 5 1
.5-2
1 5-161
20-35
11.20-1.501
0.06-0.2
10.16-0.1911.5-5.5
IModerate-----
10,241 1
116-511
35-60
11,35-1.651
0.06-0.2
10.10-0.1913.5-5.5
IModerate-----
10.241 1
151-621
5-50
11.20-1.501
0.06-20
10.04-0.1413.5-5.5
(Moderate -----
10.241 1
Wahee-----------
1 1
1 0-111
30-27
1
11.20-1.501
1
0.2-2.0
1
10.15-0.2014.5-6.0
1
1
ILOw----------
1 1 1
10.281 5 1
.5-5
111-621
35-70
11.40-1.601
0.06-0.2
10.12-0.2013.6-5.5
IModerate-----
10.281 1
RWC+:
1 1
I I
1
I
1
I
1
I
1
I
1
I
1 1 1
I I I
Rock outcrop ----
1 0-601
___
I
___
I
0.06-6.0
I
___
I
_-_
I -------------
I ---- I___ 1
Wake ------------
I I
1 0-111
3-12
I
11.65-1.801
I
6.0-20
I
10.03-0.0814.5-6.0
I
I
LOW----------10.151
I I I
1 1
.5-1
1 11 1
---
I
o.00-0.01
I
I
-------------
I ---- I I
StA--------------
I I
1 0-101
10-18
I
11.20-1,351
0.6-2.0
I
10.12-0.1713.6-5.5
I
1Low----------
I I I
10.281 5 1
.5-2
State
110-481
18-34
11.35-1.501
0.6-2.0
10.14-0.1913.6-5.5
ILow----------
10.281 1
148-621
2-15
11.35-1.501
2.0-20
10.02-0.1013.6-6.5
1Low----------
10.171 1
TaD, TaE---------
1 1
1 0-8 1
12-27
1
11.10-1.401
1
0.6-2.0
1
10.16-0.2014.5-5.5
1
1
1Low----------
1 1 1
10.371 4 1
.5-2
Tatum
1 8-501
45-60
11.40-1.601
0.6-2.0
10.10-0.1914.5-5.5
Moderate -----
10.281 1
150-621
___
1
_._
1
0.00-0.06
1
___
I
___
I -------------
I ---- I I
Ud---------------
I I
1 0-601
10-50
I
11.30-1.651
I
0.06-2.0
I
10.10-0.1714.5-7.8
I
I
1Moderate-----
I I I
10.281 5 1
0-1
Udorthents
I I
I
I
I
I
I
I I I
VaB, VaC---------
I I
1 0-6 1
8-28
I
11.45-1.701
I
2.0-6.0
I
10.10-0.1414.5-6.0
I
I
1Low----------
I I I
10.241 3 1
.5-2
Vance
1 6-361
35-60
11.25-1.401
0.06-0.2
10.12-0.1514.5-5.5
IModerate-----
10.281 1
I
I
-------------I.___
I
VgB ---1
0-9 1
4-12
11.35-1.451
2.0-6.0
I
10.05-0.1114.5-6.5
I
IL -----------
I I
10.171 4 1
.5-2
Varina
1 9-161
35-50
11.40-1.551
0.6-2.0
10.12-0.1814.5-5.5
Low, ----------
10.281 1
116-801
35-50
11.45-1.551
0.06-0.2
10.10-0.1714.5-5.5
(Low----------10.281
1
VnE, VnC---------
1 1
1 0-141
3-10
1
11.50-1.701
1
6.0-20
1
10.05-0.0914.5-6.5
1
1
IL -----------
1 1 1
10.151 4 1
.5-2
Varina
114-421
35-60
11.30-1.501
0.6-2.0
10.12-0.1814.5-5.5
1L-----------
10.281 1
142-801
30-55
11.30-1.501
0.06-0.2
10.06-0.0914.5-5.5
(Low ----------
10.281 1
WaB+:
1 1
I I
1
I
1
I
1
I
1
I
1
I
1 1 1
I I I
Wake ------------
1 0-111
3-12
11.65-1.801
6.0-20
10.03-0.0814.5-6.0
1Low----------
10.151 1 1
.5-1
1 11 1
___
1
1
0.00-0.01
1
I
___
I-------------
I ---- I I
Saw ---1
I I
0-141
5-20
I
11.30-1.501
I
2.0-6.0
I
10.08-0.1214.5-7.3
I
ILow----------
I I I
10.201 2 1
.5-2
114-251
35-60
11.30-1.501
0.6-2.0
10.12-0.1514.5-6.5
1L-----------
10.281 1
125-341
5-30
11.30-1.501
0.6-6.0
10.07-0.1214.5-6.0
LOW ----------
10.201 1
1 34 1
I
1
I
___
I
___
1_____________I_-_-I
I
Wedowee ---------
I
1 0-5 1
5-20
I
11.25-1.601
2.0-6.0
I
10.10-0.1813.6-5.5
I
1L-----------
I I I
10.241 4 1
.5-3
1 5-101
14-30
11.30-1.SSI
0.6-2.0
10.12-0.1813.6-5.5
(Low ----------
10.281 1
110-351
35-45
11.30-1.501
0.6-2.0
10.12-0.1813.6-5.5
1L-----------
10.281 1
135-621
15-30
11.20-1.501
0.6-2.0
10.08-0.1513.6-5.5
Low ----------
10.281 1
wbD+:
I I
I
I
I
I
I
I
I I I
Wake ------------
1 0-111
3-12
11.65-1.801
6.0-20
10.03-0.0814.5-6.0
ILow----------
10.151 1 1
.5-1
1
._.
0.00-0.01
1
___
-------------
I ---- I I
Wateree---------
I
1 0-7 1
5-18
11,40-1.601
2.0-6.0
I
10.08-0.1214.5-6.0
ILow----------
I I I
10.201 3 1
cl
1 7-281
5-18
11.30-1.601
2.0-6.0
10.08-0.1214.5-6.0
1Low----------
10.201 1
128-151
2-15
11.40-1.701
2.0-6.0
10.04-0.1213.6-6.0
1L-----------
I0.171 1
135-721
___
I
___
I
___
I
___
I
___
I -------------
I ---- I I
See footnote
at end
of table.
227

228
Soil Survey
Table 15.-Physical and Chemical Properties of the Soils -Continued
Soil name and
map symbol
I I
IDepthl
I I
I I
Clay
I
I
I
I
I
Moist (Permeability
bulk I
density I
I I I
lAvailablel Soil IShrink-swell
I water Ireactionl potential
Icapacity I I
I Erosion
I factors
I
I x I T
I
I Organic
I matter
I
I In
Pct
g/cc
In/hr
In/in
PH
I
pot
I
Wedowee ---------
1 0-5 1
5-20
11.25-1.601
2.0-6.0
10.10-0.1813.6-5.5
[Low ----------
10,241 4
1 .5-3
1 5-101
14-30
11.30-1.551
0.6-2.0
10.12-0.1813.6-5.5
ILO w----------10.281
1
110-351
35-45
11.30-1.501
0.6-2.0
10.12-0.1813.6-5.5
[Low ----------
10.281
1
135-621
1
15-30
11.20-1.501
0.6-2.0
10.08-0.1513.6-5.5
[Low ----------
10.281
1
WCE•:
1
I I
1
I
1
I
1
I
I
I
I
I
1 1
I I
1
I
Wake
1 0-111
3-12
11.65-1.801
6.0-20
10.03-0.0814.5-6.0
Low ----------
10.151 1
1 .5-1
1 11 1
___
1
__-
I
0.00-0.01
1
___
-------------
I ---- I
I
Retorts ---------
I I
1 0-7 1
5-18
I
11.40-1.601
I
2.0-6.0
I
10.08-0.1214.5-6.0
ILow ----------
I I
10.201 3
I
1 <1
1 7-281
5-18
11.30-1.601
2.0-6.0
10.08-0.1214.5-6.0
Low ----------
10.20I
1
128-351
2-15
11.40-1.701
2.0-6.0
10.04-0.1213.6-6.0
ILow ----------
10.1]1
1
135-721
I I
---
I
I
___
I
___
I
--_
I
___
I -------------
I ---- I
I
I
I
I
I
I I
I
Wateree---------
1 0-7 1
5-18
11.40-1.601
2.0-6.0
10.08-0.1214.5-6.0
ILow
10.201 3
1 <1
1 7-281
5-18
11.30-1.601
2.0-6.0
10.08-0.1214.5-6.0
ILow ----------
10.201
1
128-351
2-15
11,40-1.701
2.0-6.0
10.04-0.1213.6-6.0
ILow
10.171
1
135-721
I I
---
I
___
I
___
I
-__
I
___
I -------------
I ---- I
I
Rion ------------
1 0-161
5-20
I
11.30-1.501
I
2.0-6.0
I
10,08-0.1214.5-6.5
I
I
ILow ----------
I I
10.241 3
I
1 .5-2
116-341
18-35
11.40-1.501
0.6-2.0
10,08-0.1514.5-6.5
ILow ----------
10.201
1
134-651
2-20
11.30-1.501
2.0-6.0
10.06-0.1214.5-6.5
ILow ----------
10.201
1
Wedowee---------1
I 1
0-5 1
5-20
1
11.25-1.601
1
2.0-6.0
1
10.10-0.1813.6-5.5
1
1
ILow ----------
1 1
10.241 4
1
1 .5-3
1 5-101
14-30
11.30-1.551
0.6-2.0
10.12-0.1813.6-5.5
ILow ----------
10.281
1
I30-35I
35-45
11.30-1.501
0.6-2.0
10.12-0.1813.6-5.5
ILow ----------
10.281
1
135-621
15-30
11.20-1.501
0.6-2.0
10.08-0.1513.6-5.5
ILow ----------
10.281
1
WeS, Wet, WeD----1
1 1
0-5 1
5-20
1
11.25-1.601
1
2.0-6.0
1
10.10-0.1813.6-5.5
1
1
ILow ----------
1 1
10.241 4
1
1 .5-3
Wedowee
1 5-101
14-30
11.30-1.551
0.6-2.0
10.12-0.1813.6-5.5
ILow ----------
10.281
1
110-351
35-45
11.30-1.501
0.6-2.0
10.12-0.1813.6-5.5
ILow ----------
10.281
1
135-621
1 1
15-30
11.20-1.501
0.6-2.0
10.08-0.1513.6-5.5
ILow ----------
10.281
1
wuC*:
I I
I
I
1
I
I
I
1
I
1
I
1 I
I I
1
I
Wedowee ---------
1 0-5 1
5-20
11,25-1.601
2.0-6.0
10.10-0.1813.6-5.5
ILow ----------
10.241 4
1 .5-3
1 5-101
14-30
11.30-1.551
0.6-2.0
10.12-0.1813.6-5.5
ILow ----------
10.281
1
110-351
35-45
11,30-1.501
0.6-2.0
10.12-0.1813.6-5.5
ILow ----------
10.281
1
135-621
15-30
11.20-1.501
0.6-2.0
10.08-0.1513.6-5.5
ILow ----------
10.281
1
Urban land.
I
I I
I
I
I
I
I
I
I I
I
I
Udorthen is------
1 0-60
I I
10-50
1.30
-1.65
0.06-2.0
I
I0.10-0.179
.5-].e
(Moderate -----
0.28 5
1 0-1
Wwe•, WWD=, WWE•:I
I
I
I
I
I
I
I
I
I
I
I
I
I
Winnsboro -------
1 0-6 1
10-25
11.20-1.401
0.6-2.0
10.15-0.2015.1-6.5
ILow ----------
10.321 4
1 .5-2
1 6-401
35-60
11.20-1,501
0.06-0.2
10.15-0.2016.1-7.8
(High ---------
10.201
1
140-481
15-35
11.30-1.601
0.2-0.6
10.15-0.2016.1-7.8
IModerate-----
10.281
1
148-621
I I
___
I
___
I
--_
I
___
I
___
I -------------
I ---- I
I
Wilkes ----------
1 0-4 1
5-20
I
11.30-1.501
I
2.0-6.0
I
10.11-0.1515.1-6.5
I
I
ILow ----------
I I
10.241 2
I
1 .5-2
1 4-131
20-45
11.40-1.601
0.2-0.6
10.15-0.2016.1-7.8
IModerate-----
10,321
1
113-421
__-
I
___
I
___
I
---
I
___
I -------------
I ---- I
I
See description of the map unit for composition and behavior characteristics of the map unit.

F3911]
Table 16. moil and Water Features —Continued
Soil Survey
I I
Soil name and (Hydro -I
map symbol I logicl Frequency
I group]
Flooding
I
I Duration
I
I High water table I Bedrock
I I I
(Months I Depth I Kind (Months IDepthlHard-
I I I I I I ness
Risk of
(Uncoated
I steel
corrosion
I
Iconcrete
I
I
I
I
I I et
I I I In I
I
I
RmI+•: I
I
I
I
I
I I
I I
I I I I
I I I I
I
I
I
I
Riverview ----- I
B
IFrequent ----
IBrief -----
IJan-Decl3.0-S.OIApparentlDec-Marl
>60 1 ---
ILow ------
IModerate.
I
Buncombe ------ I
A
I
(Frequent ----
I
(Brief -----
I I
IJan-Decl >6.0
I I I I
1 --- I --- 1 >60 I ---
I
ILow ------
I
IModerate.
I
ROA+: I
I
I I
I I
I I
I
I
Roanoke ------- I
D
(Occasional
(Brief -----
INov-Jun1 0-1.0]ApparentlNov-Mayl
>60 1 ---
IHigh -----
]High.
I
Wahee---------I
D
I
(Occasional
I
(Brief -----
I I
INov-JuniO.5-1.5IApparentlDec-Marl
I I I I
>60 1 ---
I
IHigh -----IHigh.
I
I
Rock outcrop --I
D
[None --------
I __-
1 ___ 1 16.0
1 ___ I ___ 1 0 IHard
I ___
I ---
I
Wake ---------- I
D
I
(None --------
I
I ---
I
I --- 1 16.0
I I I I
1 --- I --- I e-20IHard
I
IModerate
I
IModerate,
I
S[A------------I
B
I
IRare--------
I
I ---
I I
I --- 14.0-6.OIApparentlDec-Jung
I I I I
>60 I ---
I
IModerate
I
IHigh.
State
Tap, Tab"""-""- I
B
(None---_''_"
I ___
I
I ___ >6.0
I I
1 ___ "' 140-60Soft
IHigh-----
IHigh.
Tatum I
I
I
I I
I 1 1 >60 IHard
I
I
I
Ud-------------I
B
I
INone--------
I
I "'
I 1
I --- I >6.0
1 I 1 1
I --- I --- 1 >60 1 ---
1
IModerate
1
IHigh.
udorthents I
I
I
I
VaB, VaC------- 1
C
(None --------
I ---
I ___ 1 >6.0
1 ___ I ___ 1>60 1 ___
IHigh-----
IHigh.
Vance I
I
VgB, VnH, VnC--I
C
(Non¢ --------
I "'
I "' 4.0-S.
OPe rched (Dec -Apr] >60 1 ---
IModerate
IHigh.
Varina
I
I
I
I
waB•:
I
I
I
I
I I I I
Wake ---------- I
D
INone--------
I ---
I --- 1 >6.0
1 "' I "' 18-201Hard
IModerate
IModerate.
I
Saw ----------- I
B
I
INone--------
I
I ---
I I
I --- 1 >6.0
I I I I
1 "' I "' 120-401Hard
I
IModerate
I
IModerate.
I
Wedowee ------- I
B
I
INone--------
I
I ---
I I
I --- 1 >6.0
I I I I
1 --- I --- 1 >60 1 ---
I
IModerate
I
IHigh.
I
I
Wake ---------- I
D
INone--------
I "'
1 "' 1 >6.0
1 "' I "' 18-20IHard
IModerate
IModerate.
I
Wateree-------I
B
I
INone--------
I
I ---
I I
1 '-- 1 >6.0
I I I I
1 "' I "' 120-40I8oft
I
ILow ------
I
IHigh.
I
I
I
I I
I 1 1 >40 IHard
I
I
I
Wedowee ------- 1
B
I
INone--------
I
I "'
I I
I "' 1 >6.0
I
I I I I
1 --- I --- 1 >60 1 ---
I I I I
I
IModerate
I
I
IHigh.
I
I
wa
I
I
I
I
I
Wakk e---------- I
Wake.
D
(Non¢ --------
1 "'
I "' 1 >6.0
1 "' 1 "' I 8-20Hard
IModerate
IModerate.
I
Wateree-------I
B
I
INone--------
I
I ---
I I
I --- 1 >6.0
I I I I
1 --- I --- 120-401Soft
I
ILow------
I
IHigh.
I
I
I
I I
I 1 1 >40 IHard
I
I
woe•: I
I
I
I
I I
I I
I I I
I I I I
I
I
Wateree-------I
B
lNone--------
I ---
I --- 1 >6.0
1 --- I --- 120-401Soft
ILow ------
IHigh.
I
I
I
I I
I 1 1 >40 IHard
I
I
I
Rion ---------- I
B
I
INone--------
I
I ___
I I
I --- 1 >6.0
I I I I
1 --- I --- I >60 1 ---
I
IModerate
I
IHigh.
I
Wedowee ------- I
I
B
I
INone--------
I
I
I ---
I
I I
I --- 1 >6.0
I I
I I I I
1 --- I --- 1 >60 1 ---
I I I I
I
IModerate
I
I
IHigh,
I
See footnote
at
end of table.

Franklin County, North Carolina
Table 16.—Soil and Water Features —Continued
231
I I Flooding I High water table Bedrock I Risk of corrosion
Soil name and (Hydro-1 I I I I I I I I
map symbol I logic) Frequency I Duration IMonths I Depth I Kind IMonths DepthlHard- (Uncoated IConcrete
I groupl I I I 1 1 1 1 ness I steel I
I I I I I Ft I I I in I I I
I I I I I I I I I I I
WeB, WeC, WeD--1 B INone--------I --- I --- 1 >6.0 1 --- I --- 1 >60 1 --- IModerate IHigh.
P Wedowee I
Wedowee ------- I B INone--------I --- I --- 1 >6.0 1 --- I --- 1 >60 1 --- IModerate IHigh.
I I I I I I I I I I I
Urban land ---- I --- (None -------- I --- I --- 1 >2.0 1 --- I --- I >10 I --- I --- I ---
I I I I I I I I I I I
Udorthents ---- 1 B (None -------- I --- I --- 1 >6.0 1 --- I --- 1 >60 1 --- IModerate IHigh.
I I I I
wwH', wwD', I I I I I I
wwe': I I I I I
Winnsboro ----- I C INone--------I --- I --- 1 >6.0 1 --- I --- 140-60ISoft IHigh -----IModerate.
I I I I I I I I I I I
Wilkes -------- I C INone--------I --- I --- 1 >6.0 1 --- I --- 110-20ISoft IModerate IModerate.
See description of the map unit for composition and behavior characteristics of the map unit

APPENDIX B
BMP WORKSHEETS

DWQProjectNo. 'rkP f1 o• 01 -DO-70g2
DIVISION OF WATER QUALITY - 401 EXTENDED DETENTION (and POCKET*) WETLAND WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name : L_ cD Li z-'P�,j aG-, 'FL ". S Fv A �� 0 w r=T*- 4--I 0 " . l�
Contact Person: Phone Number: (q Ili ) -7 ` a -7 -7 -7 7
For projects with multiple basins, specify which basin this worksheet applies to: TA rz - Fkt n " -�
Permanent Pool Elevation
'� -1 1. u ft.
(elevation of the orifice invert out)
Temporary Pool Elevation
;2 -72.0
ft.
(elevation of the outlet structure invert in)
Permanent Pool Surface Area
2 6� 9 ,'
sq. ft.
(water surface area at permanent pool elevation)
Drainage Area
2<A. Zr,
ac.
(on -site and off -site drainage to the basin)
Impervious Area
i I. r,'I
ac.
(on -site and off -site drainage to the basin)
Forebay Surface Area
3, 9 1 3
sq. ft.
(at permanent pool elevation approximately 15%)*
Marsh 0"-9" Surface Area
o 7 7
sq. ft.
(at permanent pool elevation approximately 35%)*
Marsh 9"-18" Surface Area
_ f, 110
sq. ft.
(at permanent pool elevation approximately 35%)*
Micro Pool Surface Area
___3, P 3 1
sq. ft.
(at permanent pool elevation approximately 15%)*
Temporary Pool Volume
r�;2, 3-.50
cu. ft.
(volume detained on top of the permanent pool)
SAIDA used
(surface area to drainage area ratio)*
Diameter of Orifice
in.
(draw down orifice diameter)
II. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a
requirement has not been met, attach an explanation of why. At a minimum, a complete slormwater management plan submittal includes
a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed
drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for
additional information and will substantially delay final review and approval of the project
Aoolicants Initials
The temporary pool controls runoff from the 1 inch rain.
The basin side slopes are no steeper than 3:1.
\ A planting plan for the marsh areas with plant species and densities is provided.
Vegetation above the permanent pool elevation is specified.
W An emergency drain is provided to drain the basin.
\ a-� The temporary pool draws down in 2 to 5 days.
Sediment storage is provided in the permanent pool.
\> A sediment disposal area is provided.
Access is provided for maintenance.
A site specific, signed and notarized operation and maintenance agreement is provided,
\�R The drainage area (including any offsite area) is delineated on a site plan.
Access is provided for maintenance.
\ 1Y� Plan details for the wetland are provided.
`%NYC Plan details for the inlet and outlet are provided.
\xV A site specific operation and maintenance agreement, signed and notarized by the responsible party is provided (see
http:l/h2o.ehnr.state.nc.us/ncwetlands/oandm.doe).
Pocket Wetlands have different design parameters and are only assumed to remove 35% TSS - See pp. 19 and 20 of the NC DENR
Stormwater BMP Manual, April 1999. 10% open water, 50% high marsh, 40% low marsh.

DWQ Project No. 1J a o 7 - oo -I 0 \/ Z
DIVISION OF WATER QUALITY - 401 EXTENDED DETENTION (and POCKET*) WETLAND WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name: ow �u2c
P—aV�
(SNP��o�i \ �T��^' 0.71
Contact Person: -/.'�:) , -
Phone Number: 0 iq) -7v 3 - -77 7 7
For projects with multiple basins, specify which basin this worksheet
applies to: Tv a - .r='ow �, , o
Permanent Pool Elevation
-2, (1 c?- o ft.
(elevation of the orifice invert out)
Temporary Pool Elevation
2 v 1 , o ft.
(elevation of the outlet structure invert in)
Permanent Pool Surface Area
1 G 2 G o sq. ft.
(water surface area at permanent pool elevation)
Drainage Area
17. 1-L ac.
(on -site and off -site drainage to the basin)
Impervious Area
1O.L15 ac.
(on -site and off -site drainage to the basin)
Forebay Surface Area
2 , ` r5�9 sq. ft.
(at permanent pool elevation approximately 15%)*
Marsh 0"-9" Surface Area
G •-r ',?, 3 sq. ft.
(at permanent pool elevation approximately 35%)*
Marsh 9"-18" Surface Area
(0 30 l) sq. ft.
(at permanent pool elevation approximately 35%)*
Micro Pool Surface Area
2p Q 5 sq. ft.
(at permanent pool elevation approximately 15%)*
Temporary Pool Volume
21 `-17 cu. ft.
(volume detained on top of the permanent pool)
SAIDA used
2 • 4o
(surface area to drainage area ratio)*
Diameter of Orifice
4— in.
(draw down orifice diameter)
11. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a
requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes
a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed
drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for
additional information and will substantially delay final review and approval of the project
ADolicants Initials
Ny_� The temporary pool controls runoff from the 1 inch rain.
a The basin side slopes are no steeper than 3:1.
A planting plan for the marsh areas with plant species and densities is provided.
u'z Vegetation above the permanent pool elevation is specified.
An emergency drain is provided to drain the basin.
k. N>N The temporary pool draws down in 2 to 5 days.
�3 Sediment storage is provided in the permanent pool.
A sediment disposal area is provided.
Access is provided for maintenance.
a�'• - A site specific, signed and notarized operation and maintenance agreement is provided.
��• ;> The drainage area (including any offsite area) is delineated on a site plan.
Access is provided for maintenance.
Plan details for the wetland are provided.
Plan details for the inlet and outlet are provided.
l vCu A site specific operation and maintenance agreement, signed and notarized by the responsible party is provided (see
http://h2o.ehnr,state.no.us/ncwetlands/oandm.doc).
Pocket Wetlands have different design parameters and are only assumed to remove 35% TSS - See pp. 19 and 20 of the NC DENR
Stormwater BMP Manual, April 1999, 10% open water, 50% high marsh, 40% low marsh.

DWO Project No. E XfP N o • 0-7-
DIVISION OF WATER QUALITY - 401 EXTENDED DETENTION ( d POCKET*) ETLAND WORKSHEET
PROJECT INFORMATION (please complete the following information):
Project Name: 1—o�-x`=��Rc� ri_a�A. l 1 Oe_'�Er w6I�n•-js� t�v•1,
Contact Person: W 1`�l P�L2 x ,-•� Phone Number. (111 4 ) -713 -,_-1-7-1-1
For projects with multiple basins, specify which basin this worksheet applies to: TPQ - , L �o
Permanent Pool Elevation
2 -7 -7• o ft.
(elevation of the orifice invert out)
Temporary Pool Elevation
-I a• o
ft.
(elevation of the outlet structure invert in)
Permanent Pool Surface Area
( `>1 --?i
sq. ft.
(water surface area at permanent pool elevation)
Drainage Area
• L)Z-
ac.
(on -site and off -site drainage to the basin)
Impervious Area
-1-I
ac.
(on -site and off -site drainage to the basin)
Forebay Surface Area
I 'i 3
sq. ft.
(at permanent pool elevation approximately 15%)*
Marsh 0"-9" Surface Area
cflco 2
sq. ft.
(at permanent pool elevation approximately 35%)*
Marsh 9"-18" Surface Area
`�,4o
sq. ft.
(at permanent pool elevation approximately 35%)*
Micro Pool Surface Area
�2 3 l
sq. ft.
(at permanent pool elevation approximately 15%)*
Temporary Pool Volume
91 1
cu. ft.
(volume detained on top of the permanent pool)
SAIDA used
7
(surface area to drainage area ratio)*
Diameter of Orifice
in.
(draw down orifice diameter)
II. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a
requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes
a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed
drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for
additional information and will substantially delay final review and approval of the project
Aoolicants Initials
a The temporary pool controls runoff from the 1 inch rain.
a The basin side slopes are no steeper than 3:1.
„> A planting plan for the marsh areas with plant species and densities is provided.
Vegetation above the permanent pool elevation is specified.
v"'v_ An emergency drain is provided to drain the basin.
yw\ --_� The temporary pool draws down in 2 to 5 days.
J Sediment storage is provided in the permanent pool.
sediment disposal area is provided.
x* Access is provided for maintenance.
A site specific, signed and notarized operation and maintenance agreement is provided.
t, The drainage area (including any offsite area) is delineated on a site plan.
w4.. Access is provided for maintenance.
t Plan details for the wetland are provided.
\ Plan details for the inlet and outlet are provided.
A01, A site specific operation and maintenance agreement, signed and notarized by the responsible party is provided (see
http://h2o.ehnr.state.nc.us/ncwetlands/oandm.doc).
Pocket Wetlands have different design parameters and are only assumed to remove 35% TSS - See pp. 19 and 20 of the NC DENR
Stormwater BMP Manual, April 1999. 10% open water, 50% high marsh, 40% low marsh.

DWQProjectNo. EKe No• 0-7- 00 13`1
DIVISION OF WATER QUALITY - 401 EXTENDED DETENTIO (and POCKET*) ETLAND WORKSHEET
PROJECT INFORMATION (please complete the following information):
Project Name),
t
'oC'V_c'r
IE--t' f—I
x
Contact Person:
Phone Number: NO) `1-1 '7
For projects with multiple basins, specify which basin this worksheet
applies to: - TAA• P--k'
Permanent Pool Elevation
f_v
ft.
(elevation of the orifice invert out)
Temporary Pool Elevation
2l0 +
ft,
(elevation of the outlet structure invert in)
Permanent Pool Surface Area
> j'
sq. ft.
(water surface area at permanent pool elevation)
Drainage Area
2 • Z z,,
ac.
(on -site and off -site drainage to the basin)
Impervious Area
�2 - o s
ac.
(on -site and off -site drainage to the basin)
Forebay Surface Area
3
sq. ft.
(at permanent pool elevation approximately 15%)*
Marsh 0"-9" Surface Area
sq. ft.
(at permanent pool elevation approximately 35%)*
Marsh 9"-18" Surface Area
4 4-1
sq. ft.
(at permanent pool elevation approximately 35%)*
Micro Pool Surface Area
1 ` 1
sq, ft.
(at permanent pool elevation approximately 15%)*
Temporary Pool Volume
cu. ft.
(volume detained on top of the permanent pool)
SAIDA used
O• f3
(surface area to drainage area ratio)*
Diameter of Orifice
in.
(draw down orifice diameter)
II. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a
requirement has not been met, attach an explanation of why. At a minimum, a complete stormwaler management plan submittal includes
a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed
drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for
additional information and will substantially delay final review and approval of the project
ADolicants Initials
\A&), The temporary pool controls runoff from the 1 inch rain.
h�oI� The basin side slopes are no steeper than 3:1.
wrs: A planting plan for the marsh areas with plant species and densities is provided.
Vegetation above the permanent pool elevation is specified.
An emergency drain is provided to drain the basin.
The temporary pool draws down in 2 to 5 days.
Sediment storage is provided in the permanent pool.
\ \\\� - A sediment disposal area is provided.
_ k_> Access is provided for maintenance.
y �Lti A site specific, signed and notarized operation and maintenance agreement is provided.
The drainage area (including any offsite area) is delineated on a site plan.
\.>we-_. Access is provided for maintenance.
Plan details for the wetland are provided.
Plan details for the inlet and outlet are provided.
v' A site specific operation and maintenance agreement, signed and notarized by the responsible party is provided (see
http://h2o.ohnr.state.nc.us/ncwetiands/oandm.doc).
Pocket Wetlands have different design parameters and are only assumed to remove 35% TSS - See pp. 19 and 20 of the NC DENR
Stormwater BMP Manual, April 1999. 10% open water, 50% high marsh, 40% low marsh.

DIVISION OF WATER QUALITY - LEVEL SPREADER WORKSHEET (1/2007)
PROJECT INFORMATION (please complete the following information):
Project Name:
Contact Person:
Level Spreader ID:
Level Spreader Length
Drainage Area
Impervious Area
Forebay Area
Maximum Filter Strip/Buffer Slope
13 ft.
4 = 02 ac.
_2.-1 1 ac.
�l to eft.
3
Max. Discharge from 1"/Hr Storm h 1 a-cfs
Max. Discharge to Level Spreader o- 15 cfs
Filter Strip/ Zone 1 Buffer Vegetation
Filter Strip/ Zone 1 Buffer Width ft.
Filter Strip/ Zone 2 Buffer Vegetation
Filter Strip/ Zone 2 Buffer Width ft.
Phone Number: (` k9) 10'>--17'77
(perpendicular to flow)
(on -site and off -site drainage to the level spreader)
(on -site and off -site drainage to the level spreader)
(0.2% of the contributing impervious surface area)
(6% for forested/leaf littler cover, 8% for grass/thick cover)
(Discharge rate from extended detention wetland or pond)
(Grass/Thick ground cover or Forested)
-b 0Ee� iJ0' Jj\ c,.(_'F14=t e.
Bypass Method Used b r.rc—R ,,o Pam) - Please include a worksheet for this. C� (�" r, `-,. /4
IL REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is
attached. If a requirement has not been met, please explain why. At a minimum, a complete stormwater management plan
submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet
structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete
submittal package will result in a request for additional information and will substantially delay final review and approval of
the project.
ADDlicants Initials
Project Site was visited prior to designing level spreader system.
a�
Date of the Site visit. Please attach time -dated digital photos of existing buffer conditions.
W�
Level spreader length is at le sfr'133 ft. cfs for thick ground cover / grass; OR 65 ft per cfs for 50-
foot canopied forest with lea or 50 ft per cfs for 100-foot forested buffer; 40 ft. per cfs for 150-foot
forested buffer; OR a weighted average of the two vegetation types within the buffer/filter strip).
All ground cover types and their widths have been labeled on the construction plans.
Wei
All contours have been depicted on the construction plans.
No structures are located in protected buffers (must meet no practical alternatives criteria).
No draws are located in the buffer or filter strip in the vicinity of the proposed level spreader.
\�
Construction details for the level spreader have been provided.
The operation and maintenance agreement signed and notarized by the responsible party is provided.
r- 1 CA.,
No practical alternatives explanation + Variance request. (Level Spreaders in Series only).
Bypass method used:
Bypass conveyance method is specified and construction details and calculations are provided.
plc Alternative design option is specified and plan details and calculations are provided.
�1 Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the
bypass discharge.
Construction details for the bypass and outlets are provided.

DIVISION OF WATER QUALITY - LEVEL SPREADER WORKSHEET (1/2007)
PROJECT INFORMATION (please complete the following information):
Project Name :
Contact Person:
Level Spreader ID:
Level Spreader Length
Drainage Area
Impervious Area
Forebay Area
Maximum Filter Strip/Buffer Slope
ac.
co,S
ac.
5ce
4u, ft.
�,2.0
%
Max. Discharge from 1"1HrStorm r'l a- cfs
Max. Discharge to Level Spreader _ 0� o cfs
Filter Strip/ Zone 1 Buffer Vegetation �cS—rt 1:>
Filter Strip/ Zone 1 Buffer Width 2 O ft.
Filter Strip/ Zone 2 Buffer Vegetation J�7-i�-7 TE
Filter Strip/ Zone 2 Buffer Width 7�?13 ft.
Phone Number: (ten , ) -7 s 3- -7-17 -7
(perpendicular to Flow)
(on -site and off -site drainage to the level spreader)
(on -site and off -site drainage to the level spreader)
(0.2% of the contributing impervious surface area)
(6% for forested/leaf littler cover, 8% for grass/thick cover)
(Discharge rate from extended detention wetland or pond)
(Grass/Thick ground cover or Forested)
Bypass Method Used t Jey1,i or -I T3�3-4-- Please include a worksheet for this. SEC GA��
II. REQUIRED ITEMS CHECKLISTr" s'
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is
attached. If a requirement has not been met, please explain why. At a minimum, a complete stormwater management plan
submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet
structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete
submittal package will result in a request for additional information and will substantially delay final review and approval of
the project.
Applicants Initials
�> Project Site was visited prior to designing level spreader system.
ad'J Date of the Site visit. Please attach time -dated digital photos of existing buffeitions
Bypass method used:
Level spreader length is at least:13 ft. per cfs for thick ground cover/ grass;
0 5 ft pe cfs for 50-
footcanopied forest with leaf litter; 50 ft per cfs for 100-foot forested buffer; 40 ft. per c s for 150-foot
forested buffer; OR a weighted average of the two vegetation types within the buffer/titer strip).
All ground cover types and their widths have been labeled on the construction plans.
\ate---
All contours have been depicted on the construction plans.
No structures are located in protected buffers (must meet no practical alternatives criteria).
No draws are located in the buffer or filter strip in the vicinity of the proposed level spreader.
Construction details for the level spreader have been provided.
W
The operation and maintenance agreement signed and notarized by the responsible party is provided.
No practical alternatives explanation +Variance request. (Level Spreaders in Series only).
UNX-:� Bypass conveyance method is specified and construction details and calculations are provided.
v- k � Alternative design option is specified and plan details and calculations are provided.
Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the
bypass discharge.
l PL-- Construction details for the bypass and outlets are provided.

DWQ Project No. �E>,- 1-' --, ') . 01 — OO-7 0 \12
DIVISION OF WATER QUALITY - GRASSED SWALE WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name: T- rak:n
Contact Person: \/1, a t"' 1p n ^ Phone Number: (1 111 " -7 7 `7
Swale ID: V�vd .sb 1
Grass Swale Length
Tributary Drainage Area
Impervious Area
Max. Velocity from 2 Yr. Storm
Max. Velocity from 10 Yr. Storm
Min. side slopes
Steepest Effective Slope
Cover Crop
II. REQUIRED ITEMS CHECKLIST
4(, 8 ft,
—_-_07- ac.
2.ii ac.
�. 4 fps
�.s fps
1 ratio
6.O8 tuft
6t1 r-'A
(at least 100 ft. per tributary acre)
(on -site and off -site drainage to the swale)
(on -site and off -site drainage to the swale)
(2 fps max.) ( /> r» T"^ 6 R" G l�C-Lt� Vb+'1f
S 0 1 (D ' C� •
(3:1 min.)
(check dams may be used)
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a
requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes
a worksheel for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed
drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for
additional information and will substantially delay final review and approval of the project.
Applicants Initials
Wk'
Vegetation Plan provided on plans
_.,
The underlying soils are permeable and non -compacted
Swale carries only stormwater Flow
t,,\
Water table depth is greater than 1 foot.
�,�
Plan details for the swale provided.
Plan details for the inlets and outlets are provided.
\ ��s
Check dams provided.
The operation and maintenance agreement includes annual erosion and vegetation repair, and at least twice
annual mowing.
S�4�
The operation and maintenance agreement signed and notarized by the responsible party is provided.

DWQ Project No. e '�z P rJ o
DIVISION OF WATER QUALITY
07 -00-1 �7Q '--)—
GRASSED SWALE WORKSHEET
I. PROJECT INFORMATION (please complete the following information):
Project Name
Contact Person: Phone Number:
Swale ID:
Grass Swale Length
Tributary Drainage Area
Impervious Area
Max. Velocity from 2 Yr. Storm
Max. Velocity from 10 Yr. Storm
Min. side slopes
Steepest Effective Slope
Cover Crop
It. REQUIRED ITEMS CHECKLIST
�2q2 ft.
-2-78 ac.
�2,o5' ac.
5'
fps
On
fps
='-
ratio
v.04- fUft
(at least 100 ft. per ldbutary acre)
(on -site and off -site drainage to the swale)
(on -site and off -site drainage to the swale)
(2 fps max.)
(3:1 min.)
(check dams may be used)
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a
requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes
a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed
drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for
additional information and will substantially delay final review and approval of the project.
Applicants Initials
�.
Vegetation Plan provided on plans
The underlying soils are permeable and non -compacted
\»2
Swale carries only stormwater flow
k- -)
Water table depth is greater than 1 foot.
a1
Plan details for the swale provided.
�.N4f­
Plan details for the inlets and outlets are provided.
h&rr_>
Check dams provided.
The operation and maintenance agreement includes annual erosion and vegetation repair, and at least twice
annual mowing.
k0y\��
The operation and maintenance agreement signed and notarized by the responsible party is provided.

APPENDIX C
OPERATIONS & MAINTENANCE AGREEMENTS

LOUISBURG PLAZA, LOUISBURG, NORTH CAROLINA
SHALLOW WETLAND NO. 1 — OPERATION AND MAINTENANCE AGREEMENT
The shallow wetland system is defined as the wetland, pretreatment including forebays and the vegetated
filter.
Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wetland system for sediment accumulation, erosion, trash accumulation, vegetated cover,
and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2. Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow
vegetative cover to maintain a maximum height of six inches, and remove trash as needed.
Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.
Remove accumulated sediment from the wetland system semi-annually or when depth is reduced to 75%
of the original design depth (see diagram below). Removed sediment shall be disposed of in an
appropriate manner and shall be handled in a manner that will not adversely impact water quality (i.e.
stockpiling near a wetland or stream, etc.).
The measuring device used to determine the sediment elevation shall be such that it will give an accurate
depth reading and not readily penetrate into accumulated sediments.
If the elevation of the marsh areas exceed the permanent pool elevation, the sediment should be
removed to design levels. This shall be performed by removing the upper 6 inches of soil and stockpiling
it. Then the marsh area shall be excavated six inches below design elevations. Afterwards the stockpiled
soil should be spread over the marsh surface. The soil should not be stockpiled for more than two weeks.
When the permanent pool depth reads 269.1 feet in the forebay [and micro -pool], the sediment shall be
removed.
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation 271.0
Sediment oval El. 269.1�/° \ Sediment Removal Elevation 269.8 75%
Bottom E vation 268.5 1 5%
----------------
FOREBAY
MAIN POND
5. Replant wetland vegetation to maintain at least 50% surface area coverage in wetland plants after the
second growing season. Wetland planting densities in the marsh areas should be maintained by
replanting bare areas as needed. Wetland plants should be encouraged to grow in the marsh areas.
Page l of 2

6. If the wetland must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain shall be minimized to the maximum extent practical.
7. All components of the wetland system shall be maintained in good working order.
8. Level spreaders or other structures that provide diffuse flow shall be maintained every six months. All
accumulated sediment and debris shall be removed from the structure, and a level elevation shall be
maintained across the entire flow spreading structure. Any down gradient erosion must be repaired and/or
replanted as necessary.
I acknowledge and agree by my signature below that I am responsible for the performance of the seven
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.
Print
Title:
�d?fAgzll--
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.
1, Qs , a Notary Public for the State of K' V' 'k
County of 1/0'1 do hereby certify P-G)�&�3
personally appeared before me this day PJ)Dq ,and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,
DY��
�NUTARY
AUBUG
SEAL
My commission expires s/ay/lo
Page 2 of 2

LOUISBURG PLAZA, LOUISBURG, NORTH CAROLINA
SHALLOW WETLAND NO. 2 — OPERATION AND MAINTENANCE AGREEMENT
The shallow wetland system is defined as the wetland, pretreatment including forebays and the vegetated
filter.
Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at least monthly:
a. Inspect the wetland system for sediment accumulation, erosion, trash accumulation, vegetated cover,
and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2. Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow
vegetative cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.
4. Remove accumulated sediment from the wetland system semi-annually or when depth is reduced to 75%
of the original design depth (see diagram below). Removed sediment shall be disposed of in an
appropriate manner and shall be handled in a manner that will not adversely impact water quality (i.e.
stockpiling near a wetland or stream, etc.).
The measuring device used to determine the sediment elevation shall be such that it will give an accurate
depth reading and not readily penetrate into accumulated sediments.
If the elevation of the marsh areas exceed the permanent pool elevation, the sediment should be
removed to design levels. This shall be performed by removing the upper 6 inches of soil and stockpiling
it. Then the marsh area shall be excavated six inches below design elevations. Afterwards the stockpiled
soil should be spread over the marsh surface. The soil should not be stockpiled for more than two weeks.
When the permanent pool depth reads 260.1 feet in the forebay [and micro -pool], the sediment shall be
removed.
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation 260.0
Sediment Removal El. 258.
2im - ----- Sedent Removal Elevation 258.9_ 75%
- * --
Bottom E vation 257.5 25%
FOREBAY
5. Replant wetland vegetation to maintain at least 50% surface area coverage in wetland plants after the
second growing season. Wetland planting densities in the marsh areas should be maintained by
replanting bare areas as needed. Wetland plants should be encouraged to grow in the marsh areas.
Page 1 of 2

6. If the wetland must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain shall be minimized to the maximum extent practical.
All components of the wetland system shall be maintained in good working order.
8. Level spreaders for other structures that provide diffuse flow shall be maintained every six months. All
accumulated sediment and debris shall be removed from the structure, and a level elevation shall be
maintained across the entire flow spreading structure. Any down gradient erosion must be repaired and/or
replanted as necessary.
I acknowledge and aljree by my signature below that I am responsible for the performance of the seven
maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any
changes to the systen or responsible party.
Print name: J r U ,_ r
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, K-kj6 !V.? D114 K f S a Notary Public for the State of Ina.,
County of— 11A k , do hereby certify tth""at �Q, 6-?yd56o i Pres dmf 6f �p-C" -Irc-
personally appeared before me this � day of I UYI_ _ �ZOD'9-. and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,
N Dy%r
N0TAF!V
PUBLIC
SEAL
My commission exp!iresy_�L>1AQ
Page 2 of 2

LOUISBURG PLAZA, LOUISBURG, NORTH CAROLINA
POCKET WETLAND NO. 1 — OPERATION AND MAINTENANCE AGREEMENT
The shallow wetland system is defined as the wetland, pretreatment including forebays and the vegetated
filter.
Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at least monthly:
Inspect the wetland system for sediment accumulation, erosion, trash accumulation, vegetated cover,
and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
2. Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow
vegetative cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.
4. Remove accumulated sediment from the wetland system semi-annually or when depth is reduced to 75%
of the original design depth (see diagram below). Removed sediment shall be disposed of in an
appropriate manner and shall be handled in a manner that will not adversely impact water quality (i.e.
stockpiling near a wetland or stream, etc.).
The measuring device used to determine the sediment elevation shall be such that it will give an accurate
depth reading and not readily penetrate into accumulated sediments.
If the elevation of the marsh areas exceed the permanent pool elevation, the sediment should be
removed to design levels. This shall be performed by removing the upper 6 inches of soil and stockpiling
it. Then the marsh area shall be excavated six inches below design elevations. Afterwards the stockpiled
soil should be spread over the marsh surface. The soil should not be stockpiled for more than two weeks.
When the permanent pool depth reads 276.5 feet in the forebay [and micro -pool], the sediment shall be
removed.
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation 277.0
Sediment oval El. ----- _ \ Sediment Removal- Elevation 276_3 � 75%
Bottom E vation 275.0 5%
FOREBAY
MAIN POND
Replant wetland vegetation to maintain at least 50% surface area coverage in wetland plants after the
second growing season. Wetland planting densities in the marsh areas should be maintained by
replanting bare areas as needed. Wetland plants should be encouraged to grow in the marsh areas.
Page I of

6. If the wetland must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain shall be minimized to the maximum extent practical.
All components of the wetland system shall be maintained in good working order.
8. Level spreaders or other structures that provide diffuse flow shall be maintained every six months. All
accumulated sediment and debris shall be removed from the structure, and a level elevation shall be
maintained across the entire flow spreading structure. Any down gradient erosion must be repaired and/or
replanted as necessary.
I acknowledge and agree by my signature below that I am responsible for the performance of the seven
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. �]
Print name: ri d? G" �Irl r /Din l�)rJ�SGYI /7lSrc�/ff
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 �e u kfs a Notary Public for the State of �16Y,46 Qan h i'lGl
County of wake% do hereby certify that lh h P codsma pray,(LGI�' DC—
personally appeared before me this ;9 ' day of �}Vl✓l� o00' , and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,
51
'0�C'tARY
PU6L'10
SEAL
My commission expires
Page 2 of 2

LOUISBURG PLAZA, LOUISBURG, NORTH CAROLINA
POCKET WETLAND NO. 2 — OPERATION AND MAINTENANCE AGREEMENT
The shallow wetland system is defined as the wetland, pretreatment including forebays and the vegetated
filter.
Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at least monthly:
Inspect the wetland system for sediment accumulation, erosion, trash accumulation, vegetated cover,
and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within
2 to 5 days as designed.
Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow
vegetative cover to maintain a maximum height of six inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to
maintain proper functioning.
4. Remove accumulated sediment from the wetland system semi-annually or when depth is reduced to 75%
of the original design depth (see diagram below). Removed sediment shall be disposed of in an
appropriate manner and shall be handled in a manner that will not adversely impact water quality (i.e.
stockpiling near a wetland or stream, etc.).
The measuring device used to determine the sediment elevation shall be such that it will give an accurate
depth reading and not readily penetrate into accumulated sediments.
If the elevation of the marsh areas exceed the permanent pool elevation, the sediment should be
removed to design levels. This shall be performed by removing the upper 6 inches of soil and stockpiling
it. Then the marsh area shall be excavated six inches below design elevations. Afterwards the stockpiled
soil should be spread over the marsh surface. The soil should not be stockpiled for more than two weeks.
When the permanent pool depth reads 258.5 feet in the forebay [and micro -pool], the sediment shall be
removed.
BASIN DIAGRAM
(fill in the blanks)
Permanent Pool Elevation 263.0
Sediment 117ova l EI. 261.5 j 77% \ Sediment Removal Elevation 262.3 ,� 75%
Bottom Elevation 261.0
FOREBAY
MAIN POND
Replant wetland vegetation to maintain at least 50% surface area coverage in wetland plants after the
second growing season. Wetland planting densities in the marsh areas should be maintained by
replanting bare areas as needed. Wetland plants should be encouraged to grow in the marsh areas.
Page 1 of 2

6. If the wetland must be drained for an emergency or to perform maintenance, the flushing of sediment
through the emergency drain shall be minimized to the maximum extent practical.
All components of the wetland system shall be maintained in good working order.
8. Level spreaders or other structures that provide diffuse flow shall be maintained every six months. All
accumulated secliment and debris shall be removed from the structure, and a level elevation shall be
maintained across the entire flow spreading structure. Any down gradient erosion must be repaired and/or
replanted as necessary.
I acknowledge and agree by my signature below that I am responsible for the performance of the seven
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.
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, rK IS7Ci 1 �I. 2S a Notary Public forthe State of an&.CQ,f l rlol,
County of _ 1/ [A 'e do hereby certify that, —Dhn 166J21), Preside OF;-)-P. ��•��
personally appeared before me this � day of /g f o2ba , and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,
o•Q�s(EN t)
NOTA}i y
P013LIC
SEAL /
My commission expires $_ /; l ��
Page 2 of 2

LEVEL SPREADER SYSTEM OPERATION AND MAINTENANCE AGREEMENT (1/2007)
FOR POCKET WETLANDS NO. 1 & 2
A level spreader system includes: a forebay, diverter box, level spreader, riparian buffer/vegetated filter strip,
and flow bypass channel.
Name of Project: Louisburg Plaza
Address: Louisburg North Carolina
Maintenance activities shall be performed as follows:
MAINTENANCE ACTIVITY
FREQUENCY
Post -construction monitoring —inspect for vegetation,
Check after every heavy rainfall for first 6 months
settling, erosion, or concentrated flow.
following construction.
Inspect Diverter Box and clean and/or make repairs.
Once a month and after heavy rainfalls/storms.
Look for:
• Clogged inlet or outlet pipes.
• Trash/debris in the box.
Inspect Forebay + Level Spreader. Clean and/or
Once a month and after heavy rainfalls/storms.
make repairs. Look for:
• Sediment in forebay and along level spreader
lip;
• Trash and/or leaf buildup.
• Scour, undercutting of level spreader.
• Settlement of level spreader structure (no
longer level; you see silt downhill below level
spreader).
• Fallen trees on level spreader.
• #57 stone washing downhill.
Inspect the Riparian Buffer and the Bypass Swale
Once a month and after heavy rainfalls/storms.
and make repairs as needed'. Look for:
• Damaged turf reinforcement or riprap rolling
downhill.
• Erosion within the buffer or swale.
• Concentrated flows downhill of level
spreader —look for gullies or sediment flows.
Mow grass to a 6" height.
As needed during growing season.
Remove any weeds/shrubs growing on level spreader
Once a year.
or in swale.
' NOTE: Contact NC Division of Water Quality, 401/Wetlands Unit at 919-733-1786 BEFORE any work
in Protected Riparian Buffers.
Page t of

LEVEL
SPREADER NO.
LOCATION ON SITE (DESCRIBE)
HOW WILL IT BE ACCESSED?
1 1
Downstream from Pocket Wetland No. 1
Access from Public Street
2 2
Downstream from Pocket Wetland No. 2
Access from Public Street
3
4
5
6
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.
Print name: Ln .r, c., V yi ..�C�iAO p (•I �nr �tZ s�bi- 7
Title: P.-FS c�0T'
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, /AN iT-H r 2 e(-A R rr n, , a Notary Public for the State of N010 rH CA re, t. r ,vq
County of Wa.L . do hereby certify that —o hn P. r000d Son
personally appeared before me this day of MR �/ J001 , and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,
.NNNxv M,bnh
Q, X,\O Tq
t�
L1 . `0
'0UN"��.
SEAL j�
ao,,
My commission expires 7/'a0 /J010
Page 2 of 2

GRASS SWALE SYSTEM OPERATION AND MAINTENANCE AGREEMENT (1/2007)
The grass swale includes vegetation, side slopes and temporary timber check dams
Name of Project: Louisburg Plaza
Address: Louisburg, North Carolina
Maintenance activities shall be performed as follows:
MAINTENANCE ACTIVITY
FREQUENCY
Post -construction monitoring —inspect for vegetation,
settling, erosion, or concentrated flow.
Check after every heavy rainfall for first 6 months
following construction.
Inspect temporary timber check dams
Once a month and after heavy rainfalls/storms.
Mow grass to a 6" height.
As needed during growing season.
Remove any weeds/shrubs growing in swale and
reseed as needed.
Once a year.
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.
Print name: •� , i • C •. ,�. _� a +v,� (✓�c�oc�s�� �ees�o&,J
Title: {>>cs —z T
Address: �3�7 bis7 �� �— h,Jc' v��t c, a F.� ( �I LL
Phone: `1
Signature:
Date: M n , b f7
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.
N 1 r�-J '72 ECA P T7 Ai a Notary Public for the State of NO127-* CA (1c1 Li 1,/ A
County of WA L e , do hereby certify that TO i n P. mood SD n
personally appeared before me this i day of Ma. C, , ;20 7 , and acknowledge the due
execution of the forgoing wet [wetland] detention basin maintenance requirements. Witness my hand and
official seal,
SEA � f
Page t
My commission expires do /0