20030981 Ver 2_Stormwater Info_20131119

Prepared by:
15401 Weston Parkway
Suite 100
Cary, North Carolina 27513
[phone]
[phone] (Fax)
CHS Project Number 13-40024
a
an

j,.WS P

O=
Stonewater SF -1
O'Kelly Chapel Road, Cary, Chatham County, NC
Storm Water Management Plan Narrative
Existing Conditions
The existing site contains 1 property totaling 42.95 acres along O'Kelly Chapel Road.
The site is vacant with an existing subdivision located to the east of the property. The
site is part of the Stonewater PUD and the site was cleared with erosion controls
measures placed in 2007. The site has two streams, on draining down the center, and
one along the west property line, dividing the property into two drainage areas. The site
is located in the Cape Fear, Jordan Lake, and Upper New Hope river basin. Stream
buffers exist on the property.
The Wake County soil report labels the soils for this property to be Hydraulic Soil Group
(HSG) Type D soils.
Proposed Conditions
The proposed development will consist of a new residential subdivision with supporting
infrastructure.
To comply with the nutrient export requirements BMPs will be provided. This report will
outline the storm water management in order to meet the Town of Cary stormwater
management requirements and the State of North Carolina BMP design requirements.
The Stormwater Management system will provide water quality and water quantity
components.
Water Quality
Wetponds and constructed wetlands will be utilized for nitrogen and phosphorus
reduction. The combined bmps will reduce the Nitrogen to 3.06 Ib /ac /yr and phosphorus
to 0.43 lb/ac/yr. A buy down from the 3.06 to the 2.2 is proposed.
Water Quantity
The site will utilize the wetponds /wetlands to detain the runoff to the predevelopment
flows for the 2 -year, 5 -year, 10 -year, rational storm events and for the 1 -year SCS 24-
hour storm event.
Hydroflow Hydrographs was used to provide routing for each bmp to determine the post
development flows. The existing BMP was not used in the predevelopment and post
development calculations.
Page 1

M=
Erosion Control
Erosion Control measure will consist of wetponds utilized as sediment basins during
construction along with additional sediment basins. Initial measures will try to utilize the
existing erosion control while converting over to the final measures during construction.
Page 2

Existing Maps
Soil Map Wake County (Printed from NRCS)
Hydrologic Soil Group (Printed from NRCS)
NC Floodmaps (Printed from NC Floodmaps)

350 50' 57"
350 50' 30"
(Stonewater SF -1)
Map Scale: 1:3,930 if printed on Asize (8.5" x 11 ") sheet. m
v v
N Meters
n 0 35 70 140 210
Feet
0 150 300 600 900
USDA Natural Resources Web Soil Survey 5/23/2013
�Conservation Servm.l Wsb— CpsfNsw W04P C9L011u9 Pagel of3
350 50' 57"
350 50' 30"

Soil Map— Chatham County, North Carolina, and Wake County, North Carolina
(Stonewater SF -1)
MAP LEGEND
MAP INFORMATION
Area of Interest (A01)
Very Stony Spot
Map Scale: 1:3,930 if printed on A size (8.5' X 11 ") sheet.
Area of Interest (AOI)
Wet Spot
The soil surveys that comprise your AOI were mapped at scales
Soils
ranging from 1:15,840 to 1:24,000.
Other
Soil Map Units
Special Line Features
Warning: Soil Map may not be valid at this scale.
Special
Point Features
Gully
Blowout
'
Enlargement of maps beyond the scale of mapping can cause
0 0' Short Steep Slope
misunderstanding of the detail of mapping and accuracy of soil line
Borrow Pit
placement. The maps do not show the small areas of contrasting
Other
soils that could have been shown at a more detailed scale.
Clay Spot
Political Features
Closed Depression
Cities
Please rely on the bar scale on each map sheet for accurate map
measurements.
Gravel Pit
Water Features
Source of Map: Natural Resources Conservation Service
Gravelly Spot
Streams and Canals
Web Soil Survey URL: http : / /websoilsurvey.nres.usda.gov
Landfill
Transportation
Coordinate System: UTM Zone 17N NAD83
Lava Flow
i i-+ Rails
This product is generated from the USDA -NRCS certified data as of
,1L
Marsh or swamp
Interstate Highways
the version date(s) listed below.
-M US Routes
Soil Survey Area: Chatham County, North Carolina
Mine or Quarry
Survey Area Data: Version 15, Jul 2, 2012
O
Miscellaneous Water
Major Roads
Soil Survey Area: Wake County, North Carolina
p
Perennial Water
Local Roads
Survey Area Data: Version 10, Jul 13, 2012
Rock Outcrop
Your area of interest (AOI) includes more than one soil survey area.
These survey areas may have been mapped at different scales, with
+
Saline Spot
a different land use in mind, at different times, or at different levels
Sandy Spot
of detail. This may result in map unit symbols, soil properties, and
interpretations that do not completely agree across soil survey area
Severely Eroded Spot
boundaries.
Sinkhole
Date(s) aerial images were photographed: 8/28/2006
y
Slide or Slip
The orthophoto or other base map on which the soil lines were
Sodic Spot
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor shifting
a
Spoil Area
of map unit boundaries may be evident.
Stony Spot
USIDA Natural Resources Web Soil Survey 5/23/2013
Conservation Service National Cooperative Soil Survey Page 2 of 3

Soil Map— Chatham County, North Carolina, and Wake County, North Carolina
Map Unit Legend
Stonewater SF -1
Chatham County, North Carolina (NC037)
Map Unit Symbol
Map Unit Name
Acres in AOI
Percent of AOI
ChA
Chewacla and Wehadkee soils, 0 to 2 percent
slopes, frequently flooded
0.5
1.1%
WhB
White Store - Polkton complex, 2 to 6 percent
slopes
10.5
23.5%
WhD
White Store - Polkton complex, 10 to 15 percent
slopes
33.8
75.4%
Subtotals for Soil Survey Area
44.8
100.0%
Totals for Area of Interest
44.8
100.0%
Wake County, North Carolina (NC183)
Map Unit Symbol
Map Unit Name
Acres in AOI
Percent of AOI
WsE
White Store sandy loam, 10 to 20 percent
slopes
0.0
0.0%
Subtotals for Soil Survey Area
0.0
0.0%
Totals for Area of Interest
44.8
100.0%
USDA Natural Resources Web Soil Survey 5/23/2013
Conservation Service National Cooperative Soil Survey Page 3 of 3

350 50' 57"
350 50' 30"
Hydrologic Soil Group— Chatham County, North Carolina, and Wake County, North Carolina
(Stonewater SF -1 HSG)
o
in m
v v
u� u�
ro ro
I r
Map Scale: 1:3,930 if printed on Asize (8.5" x 11 ") sheet. m
v v
N Meters
/ 0 35 70 140 210
N Feet
0 150 300 600 900
USDA Natural Resources Web Soil Survey 5/23/2013
�Conservation Service National Cooperative Soil Survey Pagel of 4
350 50' 57"
350 50' 30"

Hydrologic Soil Group—Chatham County, North Carolina, and Wake County, North Carolina
(Smnewate,or-1nos)
MAPLEGEND
MAP INFORMATION
Area ox Interest (Ao;
Map Scale: 1:u.Vaon printed onx size (a.er"11lsheet.
�] Area mInterest (A01)
The soil surveys that comprise your A01 were mapped at scales
Soils
ranging from 115,84Oto1:24,OOO
soil Map Units
Warning: Soil Map may not be valid at this scale.
Soil Ratings
A
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil line
mo
placement. The do not eh the U areas of contrasting
NN a
soils that could have been shown at a more detailed scale.
am
Please rely on the bar scale on each map sheet for accurate map
[�] o
measurements.
o/o
moumeofMap Notum|ReooumeoConaemaUonSemiue
Web Soil Survey URL http:0webaoi|eumeynma.uada.gov
E::] n
Coordinate System: �m� UTMZ one 17NNAD83
Not rated o, not available
This product io generated from the USDA-NRCS certified data asof
the version dote(s) listed below.
Political Features
SO cmoo
Soil Survey Area: Chatham Cvunty, North Carolina
Su�eyA�aData: Ve�inn15. Jul 2.2012
�er�eomeu
Water
,_- Streams and Canals
Soil Survey Area: Wake County, North Carolina
Survey Area Data: Version 1V. Jul 13.2V12
rmnmvvunuvn
�ooa
Your aeaofintere�(AO|) includes mo�than one soil ou�eyoeo
These survey areas may have been mapped at different scales, with
Interstate Highways
o different land use in mind, at different times, orat different levels
US Routes
of detail. This may result in map unit symbols, soil properties, and
interpretations that do not completely agree across soil survey area
Major Roads
boundaries.
Local Roads
Date(s) aerial images were photographed: 8/28/2006
The ouhvphvtvo, other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed nn these maps. Asa result, some minor shifting
vf map unit boundaries may he evident.
0SDA Natural Resources Web Soil Survey 5/23/2013
Conservation Service National Cooperative Soil Survey Page 2^,4

Hydrologic Soil Group– Chatham County, North Carolina, and Wake County,
North Carolina
Hydrologic Soil Group
Stonewater SF -1 HSG
Hydrologic Soil Group— Summary by Map Unit — Chatham County, North Carolina (NG037)
Map unit symbol
Map unit name
Rating
Acres in AOI
Percent of AOI'
ChA
Chewacla and Wehadkee soils, 0 to 2
percent slopes, frequently flooded
B/D
0.5
1.1%
WhB
White Store - Polkton complex, 2 to 6
percent slopes
D
10.5
23.5%
WhD
White Store - Polkton complex, 10 to
15 percent slopes
D
33.8
75.4%
Subtotals for Soil Survey Area
44.8
100.0%
Totals for Area of Interest
44.8
100.0%
Hydrologic Soil Group— Summary by Map Unit — Wake County, North Carolina (NC183)
Map unit symbol
Map unit name
Rating
Acres in AOI
Percent of AOI '
WsE
White Store sandy loam, 10 to 20
percent slopes
D
0.0
0.0%
Subtotals for Soil Survey Area
0.0
0.0%
Totals for Area of Interest
44.8
100.0%
USDA Natural Resources Web Soil Survey 5/23/2013
Conservation Service National Cooperative Soil Survey Page 3 of 4

Hydrologic Soil Group— Chatham County, North Carolina, and Wake County,
North Carolina
Description
Hydrologic soil groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive precipitation
from long- duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) and
three dual classes (A /D, B /D, and C /D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly
wet. These consist mainly of deep, well drained to excessively drained sands or
gravelly sands. These soils have a high rate of water transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained orwell drained
soils that have moderately fine texture to moderately coarse texture. These soils
have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of water
transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when
thoroughly wet. These consist chiefly of clays that have a high shrink -swell
potential, soils that have a high water table, soils that have a claypan or clay layer
at or near the surface, and soils that are shallow over nearly impervious material.
These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A /D, B /D, or C /D), the first letter is
for drained areas and the second is for undrained areas. Only the soils that in their
natural condition are in group D are assigned to dual classes.
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff. None Specified
Tie -break Rule: Higher
Stonewater SF -1 HSG
USDA Natural Resources Web Soil Survey 5/23/2013
Conservation Service National Cooperative Soil Survey Page 4 of 4

Stonewater SF1 FEMA A
Mawcifies Roads M 100w Flooding - Fterodway IAE) N 0 700 Feet
6
Benchmarks - NC Highway M 1COR Flooding - Has BFIE's (AE) ........ . J
DFI RM Grid -US Highway VAS 10%,rFloDding - No BFEA(A)
Rivers and Streams casalvalInterstate Highway 130yT Flooding- `Velocity Zcaw
TranserariCoastall Political Areas SGOA Flooding (Shaded -4)
County Boundrares = E&arten-rorial Jurisdictions Base Flood Elevatim (Symboli, North Carolina
M Coastal Sounds Chars Sectms I'loodplain Mapping Program

Erosion Control
Skimmer Basins

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MRRRZO SUBIMSION
BM 2008. P0. 120 -126
STONEWA�kGLEN
SCALE 1 " -250'
11X77
STONEWATER SF -1
SEDIMENT BASIN DRAINAGE AREA *Emmwsp
Transportation & Infrastructure
DATE: 7 -10 -13 DA -3 15401 Weston Parkway Suite 100 - Cary, NC 27513 - 919.678.0035
www.wspsells.com
PROJECT: 13 -40024 STANDARD PACIFIC License No.: F -0891

SEDIMENT TRAP SIZES
Denuded area sizing based on maximum denuded area that
can be directed to sediment basin.
STRUCTURE FLOWS G= 195
GIVEN: C: 0.5 Runoff Coefficient H= 22
I: 5.27 IN /HR (10 -YR STORM) I(Tc)= 15
H: 12 INCHES Intensity Duration Frequency Equation
Cw: 3
(MALCOM, ELEMENTS OF STORMWATER DESIGN)
L = Q /(Cw *H ^(3/2))
STRUCTURE
STRUCTURE
#
DRAINAGE
AREA
(AC)
DENUDED
AREA
(AC)
SIZE (MINIMUM)
WEIR
LENGTH
(FT) **
VOLUME
REQUIRED
(CF)
VOLUME
PROVIDED
(CF)
sqft/cfs
Surface Area
Required
(ac)
Surface Area
Provided
(ac)
Detail
Top of Dam
Elevation
(ft)
WIDTH
(FT)
LENGTH
(FT)
DEPTH*
(FT)
TST -4
TST 1
4.0
3.0
45
90
4.0
10
5,400
9,113
325
0.079
0.093
SKIMMER
291
10
TST 2
9.3
5.7
65
130
5.0
10
10,260
25,350
325
0.183
0.194
RISER
295
2
TST 3
5.7
4.5
50
100
5.0
10
8,100
15,000
324
0.112
0.115
RISER
276
TST -4
2.2
2.2
33
66
4.0
10
3,960
4,901
325
0.043
0.050
SKIMMER
270
TST -5
5.0
5.0
47
94
8.0
10
9,000
23,195
325
0.098
0.101
RISER
268
TST -6
8.9
7.0
62
124
8.0
10
12,600
40,362
325
0.175
0.176
RISER
275
TST -7
7.3
7.0
56
112
5.0
10
12,600
18,816
325
0.143
0.144
RISER
276
TST -8
11.5
8.0
71
141
9.0
10
14,400
59,643
325
0.225
0.228
RISER
259
TST -8A
775
7.0
57
114
8.0
10
12,600
34,115
325
0.147
0.149
RISER
264.5
*INCLUDES 1' OF FREE BOARD. 1800SF /AC
** MINIMUM WEIR LENGTH = 4'
Denuded area sizing based on maximum denuded area that
can be directed to sediment basin.
STRUCTURE FLOWS G= 195
GIVEN: C: 0.5 Runoff Coefficient H= 22
I: 5.27 IN /HR (10 -YR STORM) I(Tc)= 15
H: 12 INCHES Intensity Duration Frequency Equation
Cw: 3
(MALCOM, ELEMENTS OF STORMWATER DESIGN)
L = Q /(Cw *H ^(3/2))
STRUCTURE
AREA
Q (CFS)
WEIR L (FT)
TST 1
4.0
10.5
10
TST 2
9.3
24.5
10
TST 3
5.7
15.0
10
TST -4
2.2
5.8
10
TST -5
5.0
13.2
10
TST -6
8.9
23.5
10
TST -7
7.3
19.2
10
TST -8
11.5
30.2
10
TST -8A
7.5
19.8
10
Skimmer Sizing
Structure
Volume
(CF)
Pipe Size
(in)
Head
(in)
Flow
(cfs)
Time
(hours)
TST 1
9,113
3
1.5
0.084
30.3
TST 2
25,350
4
2
0.172
41.0
TST 3
15,000
4.00
2.00
0.172
24.3
TST -4
4,901
3
1.5
0.084
16.3
TST -5
23,195
4
2
0.172
37.6
TST -6
40,362
4
2
0.172
65.4
TST -7
18,816
4
2
0.172
30.5
TST -8
59,643
6
3
0.473
35.0
TST -8A
34,115
4
2
0.172
55.2
Notes: 1) Based on Q= Cd *A *SQ(2GH), H =1/2 OUTLET HEIGHT
2) Draw down time to be 2 -3 days
Time
(days)
1.3
1.7
1.0
0.7
1.6
2.7
1.3
1.5
2.3
7/11/2013

PRE - DEVELOPMENT CALCULATIONS
Existing Drainage Area Map (Sheet EX DA)
Cary IDF
SCS Curve Numbers Chart
Existing Conditions Hydrograph Model Layout
Existing Drainage Area TR55 worksheet
SCS 24 -hour 1 -yr, 2 -yr, 10 -yr, 25 -yr, 100 -yr hydrographs

AP-
B P
AP-2
100' RIPARIAN BUFFER
— — — — — — — — — — — — — —
BMI
,FFSITE T
MP-2 I/
DATE: 7-10-13
PROJECT: 13-40024
BMP-3
OFFSIT
CAROLINA PRESERVE BY
STONEWATER SF-1
EXISTING DRAINAGE AREA
DA-1
STANDARD PACIFIC
BMP-4
N
OFFSITE TO
BMP-4
FTE-RRAZO AT STONEWATE-R]
IBALI AT STONEWATER
SCALE 7 "-250'
lIX77
p.wsP
Transportation & Infrastructure
15401 Weston Parkway Suite 100 - Cary, NC 27513 - 919.678.0035
www.wspsells.com
License No.: F-0891

Hydrograph OF Curves
Int. (in /hr)
OF file: CARY NOAA 6- 21- 11.IDF
14.00
14.00 100 -Yr
12.00
12.00
10.00
10.00
2 -Yr
8.00
8.00 1 O-Yr
'
6.00
6.00 5 -Yr
4.00
A
\. �..
4.00
�,
2 -Yr
_
2.00
_
—
2.00.av,
0.00 0.00
0 5 10 15 20 25 30 35 40 45 50 55 60
Time (min)
Hydraflow Hydrographs 2004

Stonewater SF -1
Basin Area Calculations
Pre- Develop.
Basin Area Calculations
Pre- Develop.
Basin Area Calculations
Post- Develop.
Area: AP -1
Soil Group
D Soil Group
Area: Offsite BMP -1
D Soil Group
Area: Total AP -1
Area (SF)
D Soil Group
Description:
Area (SF)
Acres
CN
C
Description:
Area (SF)
Acres
CN
C
Description:
Area (SF)
Acres
CN
C
Impervious
Roadway
0
0.000
Impervious
0.96
Roadway
0
0.000
Impervious
0.96
Driveway
0
0.000
Roadway
0
0.000
98
0.96
Roadway
0
0.000
98
0.96
Roadway
0
0.000
98
0.96
Driveway
0
0.000
98
0.96
Driveway
750
0.017
98
0.96
Driveway
750
0.017
98
0.96
Parking Lot
0
0.000
98
0.96
Parking Lot
0
0.000
98
0.96
Parking Lot
0
0.000
98
0.96
Roof
0
0.000
98
0.96
Roof
750
0.017
98
0.96
Roof
750
0.017
98
0.96
Sidewalk
0
0.000
98
0.96
Sidewalk
0
0.000
98
0.96
Sidewalk
0
0.000
98
0.96
-
0
0.000
98
0.96
-
0
0.000
98
0.96
-
0
0.000
98
0.96
Total
0
0.000
0
0.000
Total
1,500
0.034
0
0.000
Total
1,500
0.034
0
0.000
Pervious
0.54
Riparian Buffer
0
0.000
Pervious
0.54
Riparian Buffer
0
0.000
Pervious
0.54
Open Water
0
0.000
Lawn
0
0.000
84
0.68
Lawn
0
0.000
84
0.68
Lawn
0
0.000
84
0.68
Man. Pervious
126,438
2.903
80
0.6
Man. Pervious
45,000
1.033
80
0.6
Man. Pervious
171,438
3.936
80
0.6
Forest
256,707
5.893
77
0.54
Forest
9,902
0.227
77
0.54
Forest
266,609
6.121
77
0.54
Natural Wetland
0
0.000
77
0.54
Natural Wetland
0
0.000
7
0.54
Natural Wetland
0
0.000
77
0.54
Riparian Buffer
33,034
0.758
77
0.54
Riparian Buffer
0
0.000
77
0.54
Riparian Buffer
33,034
0.758
77
0.54
Open Water
0
0.000
0
0.15
Open Water
0
0.000
30
0.15
Open Water
0
0.000
30
0.15
-
0
0.000
30
0.15
-
0
0.000
30
0.15
-
0
0.000
30
0.15
Total
416,179
9.554
Total
54,902
1.260
Total
4711081
10.815
BMP Area
0
0.000
30
0.15
BMP Area
0
0.000
30
0.15
BMP Area
0
0.000
30
0.15
BMP Area Water
0
0.000
30
0.15
BMP Area Water
0
0.000
30
0.15
BMP Area Water
0
0.000
30
0.15
Total Area
416,179
9.554
Total Area
56,402
1.295
Total Area
472,581
10.849
% Impervious
0.00%
% Impervious
2.66%
% Impervious
0.32%
Basin Weighted
78
0.561
Basin Weighted
80
0.6
1
Basin Weighted
78
0.563
Basin Area Calculations
Pre- Develop.
Basin Area Calculations
Pre- Develop.
Area: AP -1
D
Soil Group
Area: AP -1
D Soil Group
Description:
Area (SF)
Acres
CN
C
Description:
Area (SF)
Acres
CN
C
Impervious
Impervious
Roadway
0
0.000
98
0.96
Roadway
0
0.000
98
0.96
Driveway
0
0.000
98
0.96
Driveway
0
0.000
98
0.96
Parking Lot
0
0.000
98
0.96
Parking Lot
0
0.000
98
0.96
Roof
0
0.000
98
0.96
Roof
0
0.000
98
0.96
Sidewalk
0
0.000
98
0.96
Sidewalk
0
0.000
98
0.96
-
0
0.000
98
0.96
-
0
0.000
98
0.96
Total
0
0.000
Total
0
0.000
Pervious
Pervious
Lawn
0
0.000
84
0.68
Lawn
0
0.000
84
0.68
Man. Pervious
0
0.000
80
0.6
Man. Pervious
0
0.000
80
0.6
Forest
0
0.000
77
0.54
Forest
0
0.000
77
0.54
Natural Wetland
0
0.000
77
0.54
Natural Wetland
0
0.000
7
0.54
Riparian Buffer
0
0.000
77
0.54
Riparian Buffer
0
0.000
77
0.54
Open Water
0
0.000
30
0.15
Open Water
0
0.000
30
0.15
-
0
0.000
30
0.15
-
0
0.000
30
0.15
Total
0
0.000
Total
0
0.000
BMP Area
0
0.000
30
0.15
BMP Area
0
0.000
30
0.15
BMP Area Water
0
0.000
30
0.15
BMP Area Water
0
0.000
30
0.15
Total Area
0
0.000
Total Area
0
0.000
% Impervious
#DIWO!
% Impervious
#DIWO!
Basin Weighted
# # ##
# # ##
Basin Weighted # # ## # # # ##
Table 2 -2.
Values of SCS CN and Radonal, C far various cover conditions
(Based upon S S,1 86)
HR Malcom, 2003 [2-10] Hydrologic estimates
Pre Development Analysis Point 1

Stonewater SF -1
Basin Area Calculations
Pre- Develop.
Basin Area Calculations
Pre- Develop.
Basin Area Calculations
Post- Develop.
Area: AP -2
D Soil Group
Area: Offsite BMP -3
D Soil Group
Area: Total AP -2
Description:
Area (SF)
D
Acres
Soil Group
CN
C
Description: Area (SF) Acres CN C
Description: Area (SF) Acres CN C
Impervious
Description:
Area (SF)
Acres
CN
Impervious
Description:
Area (SF)
Acres
CN
Impervious
Impervious
Roadway
0
0.000
98
0.96
Roadway
66,320
1.523
98
0.96
Roadway
105,976
2.433
98
0.96
Driveway
0
0.000
98
0.96
Driveway
750
0.017
98
0.96
Driveway
750
0.017
98
0.96
Parking Lot
0
0.000
98
0.96
Parking Lot
0
0.000
98
0.96
Parking Lot
0
0.000
98
0.96
Roof
0
0.000
98
0.96
Roof
1,500
0.034
98
0.96
Roof
21,000
0.482
98
0.96
Sidewalk
0
0.000
98
0.96
Sidewalk
7,064
0.162
98
0.96
Sidewalk
9,539
0.219
98
0.96
-
0
0.000
98
0.96
-
0
0.000
98
0.96
-
0
0.000
98
0.96
Total
0
0.000
0.000
98
Total
75,634
1.736
0.000
98
Total
Pervious
137,265
3.151
0.000
Pervious
Pervious
Lawn
0
0.000
84
0.68
Lawn
2,500
0.057
84
0.68
Lawn
5,000
0.115
84
0.68
Man. Pervious
523,768
12.024
80
0.6
Man. Pervious
0
0.000
80
0.6
Man. Pervious
644,725
14.801
80
0.6
Forest
1,063,406
24.412
77
0.54
Forest
51,019
1.171
77
0.54
Forest
1,212,449
27.834
77
0.54
Natural Wetland
0
0.000
77
0.54
Natural Wetland
0
0.000
7
0.54
Natural Wetland
0
0.000
77
0.54
Riparian Buffer
141,968
3.259
77
0.54
Riparian Buffer
0
0.000
77
0.54
Riparian Buffer
1411968
3.259
77
0.54
Open Water
0
0.000
30
0.15
Open Water
0
0.000
30
0.15
Open Water
0
0.000
30
0.15
-
0
0.000
30
0.15
-
0
0.000
30
0.15
-
0
0.000
30
0.15
Total
1,729,142
39.696
0.15
Open Water
Total
53,519
1.229
0.15
-
Total
BMP Area
2,004,142
0
46.009
0.000
30
0.15
BMP Area 0 0.000 30 0.15
BMP Area 0 0.000 30 0.15
BMP Area Water
0
0.000
30
0.15
BMP Area Water
0
0.000
30
0.15
BMP Area Water
0
0.000
30
0.15
Total Area
1,729,142
39.696
30,787
0.707
Total Area
129,153
2.965
0
0.000
Total Area
2,141,407
49.160
0
0.000
% Impervious
0.00%
BMP Area
0
0.000
% Impervious
58.56%
BMP Area Water
0
0.000
% Impervious
6.41%
BMP Area Water
0
0.000
30
Basin Weighted
78
0.561
0.000
Basin Weighted
89
0.791
2,145,321
Basin Weighted
79
0.585
Basin Area Calculations
Pre- Develop.
Basin Area Calculations
Pre- Develop.
Basin Area Calculations
Pre- Develop.
Area: AP- IJAP -2
D Soil Group
Area: Offsite 13MP -4
D Soil Group
Area: Mite 13MP
-2
D Soil Group
Description:
Area (SF)
Acres
CN
C
Description:
Area (SF)
Acres
CN
C
Description:
Area (SF)
Acres
CN
C
Impervious
Impervious
Impervious
Roadway
0
0.000
98
0.96
Roadway
39,656
0.910
98
0.96
Roadway
0
0.000
98
0.96
Driveway
0
0.000
98
0.96
Driveway
0
0.000
98
0.96
Driveway
0
0.000
98
0.96
Parking Lot
0
0.000
98
0.96
Parking Lot
0
0.000
98
0.96
Parking Lot
0
0.000
98
0.96
Roof
0
0.000
98
0.96
Roof
19,500
0.448
98
0.96
Roof
0
0.000
98
0.96
Sidewalk
0
0.000
98
0.96
Sidewalk
2,475
0.057
98
0.96
Sidewalk
0
0.000
98
0.96
-
0
0.000
98
0.96
-
0
0.000
98
0.96
-
0
0.000
98
0.96
Total
0
0.000
Total
61,631
1.415
Total
0
0.000
Pervious
Pervious
Pervious
Lawn
0
0.000
84
0.68
Lawn
0
0.000
84
0.68
Lawn
2,500
0.057
84
0.68
Man. Pervious
650,206
14.927
80
0.6
Man. Pervious
120,957
2.777
80
0.6
Man. Pervious
0
0.000
80
0.6
Forest
1,320,113
30.306
77
0.54
Forest
69,737
1.601
77
0.54
Forest
28,287
0.649
77
0.54
Natural Wetland
0
0.000
77
0.54
Natural Wetland
0
0.000
77
0.54
Natural Wetland
0
0.000
77
0.54
Riparian Buffer
175,002
4.018
77
0.54
Riparian Buffer
0
0.000
77
0.54
Riparian Buffer
0
0.000
77
0.54
Open Water
0
0.000
30
0.15
Open Water
0
0.000
30
0.15
Open Water
0
0.000
30
0.15
-
0
0.000
30
0.15
-
0
0.000
30
0.15
-
0
0.000
30
0.15
Total
2,145,321
49.250
Total
190,694
4.378
Total
30,787
0.707
BMP Area
0
0.000
30
0.15
BMP Area
0
0.000
30
0.15
BMP Area
0
0.000
30
0.15
BMP Area Water
0
0.000
30
0.15
BMP Area Water
0
0.000
30
0.15
BMP Area Water
0
0.000
30
0.15
Total Area
2,145,321
49.250
Total Area
252,325
5.793
Total Area
30,787
0.707
% Impervious
0.00%
% Impervious
24.43%
% Impervious
0.00%
Basin Weighted
78
0.561
Basin Weighted
84
0.67
1
Basin Weighted
78
0.551
Table 2 -2.
Values of SCS CN and Radomal C for various cover conditions
(Based upon SCS, 1.996)
H.R. Malcom, 2003 J2 -101 Hydrologic est fral s
Predevelopment Analysis Point 2

Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Thursday, Jul 11 2013, 1:8 PM
Hyd. No. 1
AP-1 Predevelop
Hydrograph type
= Rational
Peak discharge
= 28.21 cfs,
Storm frequency
= 2 yrs
Time interval
= 1 min
Drainage area
= 10.850 ac
Runoff coeff.
= 0.56
Intensity
= 4.642 in/hr
Tc by TR55
= 9.00 min
OF Curve
= GARY NOAA6-21-11.IDF
Asc/Rec limb fact
= 1/1
Q (Cfs) AP-1 Predevell
op
Hyd. No. 1 -- 2 Yr
30.00
fe
OM
IM
am
MM
0.00
0
— Hyd No. 1
Hydrograph Volume = 15,232 cuff
1E
15
Q (Cfs)
30.00
25.00
20.00
15M
10.00
0.00
20
Time (min)

Hydraflow Hydrographs by Intelisolve
il.
i !....r * r. .. J
-
_Sheet Flow
Manning's n- vane
= 0.130
0.011
0.011
Flow length (ft)
= 160.0
0.0
0.0
Two -year 24 -hr precip. (ire)
= 3.60
0.00
0.00
Land slope ( %)
= 6.00
0.00
0.00
Travel Time (min)
= 7.7
- 7.7
Shallow Concentrated _ Flow
Flow length (ft)
= 27.00
0.00
0.00
Watercourse slope ( %)
= 6.00
0.00
0.00
Surface description
= Unpaved
Paved
Paved
Average velocity (ftls)
= 3.95
0.00
0.00
Travel Time (min)
= 0.11 +
0.00
011
Channel Flow
sectional flow area (sgft)
= 4.00
0.00
0.00
Wetted perimeter (ft)
= 6.00
0.00
0.00
Channel slope ( %)
= 7.00
0.00
0.00
Manning's n -value
= 0.030
0.015
0.015
Velocity (ftls)
= 10.01
0.00
0.00
Flow length (ft)
= 526.0
0.0
0.0
Travel Time i)
= 0.88 +
0.00
0.88
-

Hydraflow Hydrographs by Intelisolve
Hyd. No. I
Runoff coeff.
AP-1 Predevelop
To by TR55
Hydrograph type
= Rational
Storm frequency
= 5 yrs
Drainage area
= 10.850 ac
Intensity
= 5.219 in/hr
OF Curve
= CARY NOAA6-21-11.[DF
Q (Cfs)
35.00
30.00
AP-1 Predevelop
Hyd. No. 1 -- 5 Yr
I
Thursday, Jul 11_2013, 1:9 PM
Time interval
I min
Runoff coeff.
0.56
To by TR55
9.00 min
Asc/Rec limb fact
Hydrograph Volume = 17,124 cult
5 10 15
Q (Cfs)
35.00
ti
15.00
10.00
5.00
0 :{}0
20
Time (min)

Hydraflow Hydrographs by Intelisolve
Hyd. No. 1
Runoff coeff.
AP-1 Predevelop
To by TR55
Hydrograph type
= Rational
Storm frequency
® 10 yrs
Drainage area
® 10.850 ac
Intensity
= 5.689 in/hr
OF Curve
= CARY NOAA6-21-11.IDF
Q (Cfs) AP-1 Predevellop
Hyd. No. 1 -- 10 Yr
35.00
I
i
0 Me
0.00
0
— Hyd No. 1
Thursday, Jul 11 2013, 1:9 PM
Time interval
1 min
Runoff coeff.
0.56
To by TR55
9.00 min
Asc/Rec limb fact
1/1
5 10 15
Q (Ofs)
35 :00
15.00
10.00
5.00
0.00
20
Time (min)

Hyd. No. 2
AP-1 Predevelle
am]
Thursday, Jul 11 2013, 1:9 PM
Time interval
1 min
Curve number
78
Hydraulic length
1000ft
Time of conc. (Tc)
9.00 min
Distribution
Type III
Shape factor
484
Hydrograph Volume = 44,455 cuft
AP-1 Predevelop
Hyd. No. 2 -- 1 Yr Q (Cfs)
14.00
14.00
12.00
12.00
10.00
10.00
8.00'
8.00
6.00
6.00
4.00
4.00
2,00
2.00
0,00 OM
0 2 5 7 9 12 14 16 19 21 23 26
— Hyd No. 2 Time (hrs)

Hydrallow Hydrographs by Intelisolve
Hyd. No. 3
Runoff coeff
AP-2 Predevelop
To by TR55
Hydrograph type
= Rational
Storm frequency
= 2 yrs
Drainage area
= 49.160 ac
Intensity
= 5.070 in/hr
OF Curve
= CAR Y NOAA6-21-11.IDF
Thursday, Jul 11 2013, 1:10 PM
Fr
Time interval
1 min
Runoff coeff
0.58
To by TR55
7.00 min
Asc/Rec limb fact
1/1
Hydrograph Volume = 60,717 cult
AP-2 Predevelop
Q (Cfs)
Hyd. No. 3 21'r
Q (Cfs)
160.00
160.00
140.00
140.00
120.00
120M
100,00
100.00
80.00
80.00
60.00
60.00
40.00'
40M
20.00
MOO
0.00
0.00
0 5 10
15
- Hyd No. 3
Time (min)

­ 1� I I 111�11' III! III 111 11 q�l
r.
Mirk-
Hyd. No. 3
Description
A
B
C
Sheet Flow
Manning's n-value
= 0.130
0.011
0.011
Flow length (ft)
= 70.0
0.0
0.0
Two-year 24-hr precip, (in)
= 3.60
0.00
0.00
Land slope (%)
= 6.00
0.00
0.00
Travel Time (min)
=
Shallow Concentrated Flow
Flow length (ft)
= 150.00
0:00
0.00
Watercourse slope
= 7.00
0.00
0.00
Surface description
= Unpaved
Paved
Paved
Average velocity (ft/s)
= 4.27
0.00
0.00
Travel Time (min)
= ® +
0.00 +
0.00
a_ -el Flow
X sectional flow area (sqft)
= 4.00
0.00
0.00
Wetted perimeter (ft)
= 6.00
0.00
0.00
Channel slope (%)
= 6.00
0.00
0.00
Manning's n-value
= 0.030
0.015
0.015
Velocity (ft/s)
= 9.27
0.00
0.00
Flow length (ft)
= 1500.0
0.0
0.0
Travel Time (_ i)
= 2.70 +
0.00 +
0.00
TotalTravel Time, Tc
....................................................
........................
Hydraflow Hydrographs by Intelisolve
2.70
7.27 min

MM
Hydraflow Hydrographs by Intelisolve
Hyd. No. 3
Runoff coeff.
AP-2 Predevelop
Tc by TR55
Hydrograph type
= Rational
Storm frequency
= 5 yrs
Drainage area
= 49.160 ac
Intensity
= 5.674 in/hr
OF Curve
= C NOAA6-21-11.IDF
Thursday, Jul 11 2013, 1:10 PM
Time interval
1 min
Runoff coeff.
M8
Tc by TR55
7.00 min
Asc/Rec limb fact
1/1
® r e
AP2 Pedv el op
Q (Cfs)
Hyd. No. 3 5 Yr
Q (Cfs)
180.00
180.00
160.00
160.00
140.00
140.00
120.00
120.00
100.00
100.00
80M
80.00
60.00
60.00
40.00
40,00
20.00
20.00
0.00
0
- Hyd o.3
0.00
5 10 15
Time (min)

Hydraflow Hydrographs by Intelisolve
Hyd. No. 3
Runoff coeff.
AP-2 Predevelop
Tc • TR55
Hydrograph type
= Rational
Storm frequency
= 10 yrs
Drainage area
= 49.160 ac
Intensity
= 6.162 in/hr
OF Curve
= CA NOAA6-21-11.IDF
0 (Cfs)
180.00
I
0.00
0
AP-2 Predevelop,
Hyd. No. 3 -- 10 Yr
Thursday, Jul 11 2013, 1:10 PM
Time interval
1 min
Runoff coeff.
OM
Tc • TR55
7,00 min
Asc/Rec limb fact
1/1
M
IN
No
150.00
90,00
60.00
30.00
0.00
15
Time (min)

Hydraflow Hydrographs by Intelisolve
Ayd.
AP-1 Predevelop
Q (Cfs)
Thursday, Jul 11 2013, 1:10 PM
Time interval
1 min
Curve number
79
Hydraulic length
200 ft
Time of conc, (Tc)
7.00 min
Distribution
Type I I I
Shape factor
484
NIM,
AP-1 Predevelop
Hyd. No. 4 -- 1 Yr Q (Cfs)
0.00
0 2 5
7 9 12 14 16 19 21 23
— MO
26
Time (hrs)

Nitrogen Calculations

Physiographic /Geologic Region:
Piedmont
Soil Hydrologic Group
D
Precipitation location:
Raleigh
Total Development Area (ft ):
2,145,321
Development Name:
Stonewater SF -14
Model Prepared By:
Shayne Leathers
II COLUMN 2 -- RESIDENTIAL LAND USES II

Development: Stone .-SF -1
Prepared By: Shay., Leathers
Date: July 10, 2013
BMP VOLUME REDUCTIONS /EFFLUENT CONCENTRATIONS
REGION:
TOTAL DEVELOPMENT AREA (R`I:
Piedmont
2,145,321
Per en[ Impery ous
Pre - Develop e.t Cond [ o.s Pos[- Development Cond [ o., Port- Development w/ BMP,
(YI
A.... l Runoff Volume
L.O. 33.1% 33.1%
h, f.l
405,913 2,823,900 2,258,810
Total Nitrogen EMC
(mg/L)
1.95 1.35 1.07
T—I Nir -Laad ig
Cwt 106
b/,,/,)
Total Phosphorus EMC
0.35 0.40 0.15
(mg/L)
T-1 Pi—ph— L-dig
3C 3 41
(IbJ"No
'
Percent Diff erence Between:
Pre-Dev. & Fre- Development & Post—D— without BMP, &
Percent Impery
Post -Dev. without BMP, Port - Development wth BMP, Post -Dev with BMP,
33% 33% 0%
ous (YI
Annual Runoff VOlume(c.f.l
596% 456% -20%
Total Nitrogen EMC(mg/L)
-31% 15% -21%
Total Nitrogen LOadi.g (lb/-/y,)
382% 205% -3)%
Total Phosphorus EMC b—Al
14% -58% -63%
Volume Reduct on TN Effluent Concen TP EHl...t C—..
( %I (mg/LI (mg/L)
B orM—im ith 50% L.95 012
IWS
B [ion 35% 100 012
h ut IWS....
,Dry D—ti. Pond 0% 120 020
Grassed Swale 0% 121 026
Green Roof 50% 108 015
Level Spdr, Filter 40% 120 015
Strip
Permeable 0% 144 039
Pavement*
-Sand Filter 5% 092 014
Water h. —timg user def.ed 108 015
Wk Dete.tm. Pond 10% 101 011
Wetland 20% 108 012
t eating cum W ­kimg ht, TP ffluent conce ton 016 mg/L
pr SBu...........z.......:::;

Catchment O.tfi. N trogee EMC (mg/L) 1.11 - 1.05 - - -
C d O fi
Tatai 5
N tranen (IbJacjyrj s ,
Percent Red R on i. N trogee Load I %j 30% - 31% - - -
Catchment O.tfi— Phosph- EMC
0.150 — 0.146 — — —
Img/Lj
C O fl w .330 c 5
Tatai Phospharus (IbJacjyrj
Percent Red. .. m Phosphorus Load I %j 70% 68% - -
Development: St. —ter SF -1
Prepared By: Shay,, Leathers
Date: July 10, 2013
BMP SUMMARY Ver2.0
CATCHMENTI
CATCHMENT2 CATCHMENT 3 CATCHMENT 4 CATCHMENTS CATCHMENT6
BMP1 BMP2 BMP3
WMlaed —
BMP1 BMP2 BMP3 BMP1 BMP2 BMP3 BMP1 BMP2 BMP3 B— BMP2 BMP3 BMP1 BMP2 BMP3
— — _ ,,,Wet D—t. Pond,,,, — — — — — — —
T al Area Treated
1525 -
Iacl
- - - 2601
Total Inflow Volume
984072 –
– – – 1,635058 – – – – – – –
Per- tVOlu%me Reduced 20% -
j
- - „- 10%
v .fi. Nitrogen EMC
v
„-
134 -
- - 136
Toal Inflow Ntrogen
„
541 -
(lb /ac /Yrl
- - 530
In flow Phosphorus EMC
-
0.410 -
- - 0412
Total Inflow Phosphorus
-
165 -
(lb /ac /Yrl
- - 162
Catchment O.tfi. N trogee EMC (mg/L) 1.11 - 1.05 - - -
C d O fi
Tatai 5
N tranen (IbJacjyrj s ,
Percent Red R on i. N trogee Load I %j 30% - 31% - - -
Catchment O.tfi— Phosph- EMC
0.150 — 0.146 — — —
Img/Lj
C O fl w .330 c 5
Tatai Phospharus (IbJacjyrj
Percent Red. .. m Phosphorus Load I %j 70% 68% - -

Jordan Lake Developer Nutrient Reporting Form
Please complete and submit the following information to the local government permitting your development project to
characterize it and assess the need to purchase nutrient offsets. Contact and rule implementation information can be
found online at httD://oortal.ncdenr.or2/web/wo/Ds/nos/nutrientoffsetintro.
PROJECT INFORMATION (for Jordan Lake)
Applicant Name:
Project Name:
Project Address (if available): Street: City/Town: County:
0 e a- P"-,
Date: (moldlyr)
Project
Let: (decimal degrees)
Long: (decimal degrees)
�
Location
F 1� �, 76'
Is this Redevelopment? F-1 - Yes
Development Type (Please check all that apply)
No
Impervious Cover
(Pre-Construction)
Commercial
F]
Mixed-Use
Single Fam. Residential
EJ
El
Industrial
Institutional
Duplex Residential
❑Multi-Fam,
Residential
Impervious Cover
J,0v
(Post-Construction)
JORDAN WATERSHED INFORMATION
Small Watershed ID (6 digits): (See next page or online ma pi
New Development Load Requirements (See individual rules
fora full description of nutrient requirements.)
Jordan Subwatershed (Please check one)
Loading Rate Targets
Nitro en {N) & Phosphorus (P) 1
Offsite Thresholds
6 N lbs/ac Residential;
21 N lb/ac/yr
JR
Upper New Hope
0,82 P lb/ac/yr
10 N lbstac Commercial
(must meet all onsite treatment
requirements)
❑
Lower New Hope
4.4 N lb/ac/yr
0.78 P Ib/ac/yr
NUTRIENT
OFFSET REQUEST(Must meet the offske thresholds - see above)
Nitrogen Loading / Offset Needs
(A)
(B)
I (C)
(D)
(E)
I (F)
(G)
(HI
Untreated
Treated
Loading Rate
Reduction Need
Project
Offset
Delivery
State Buy Down
Loading Rate
Loading Rate
Tar
(lbs/a, �/y /r)
Size (ac)
Duration (yrs)
Factor
Amount (lbs)
(lbs/ac/yr)
(lbs/aclyr)
(Itish
B - C
D * E * F * G
q,
0(o
-2, -Z
1
30
Phosphorus Loading l Offset Needs
(A)
(B'
(C)
I (D)
1E7
(F)
I (G) I
(H)
Untreated
Treated
Loading Rate
Reduction Need
Project
Offset
Delivery
State Buy Down
Load Rate
I
Load Rate
Target
(lbs/actyr)
Size (ac)
Duration (y rs
Factor (%)
it
Amount b.)
(
(ibs/ac/yr)
(lbs/aclyr)
(lbs/ac/yr)
B - C
D- E - F'G
LA I
O,ci3
0 ':6 -2—
�7
Control of Peak Stormwater Flow (1 year 24 hour design storm)
Calculated Preclevelopment Peak Flow
Calculated Post Development Peak Flow
Flow Control Method
14
Authorizing Local Government Name:
Staff Name:
Staff Email:
=Phone
Jordan Nutrient Load Reporting Form, September 12, 2012

BMP Sizing Calculations
BMP Drainage Area Map
BMP -1 -2 Wetland
Basin 3 -4 Wetpond

Stonewater SF -1
Basin Area Calculations
Post- Develop.
Basin Area Calculations
Post- Develop.
Basin Area Calculations
Post- Develop.
Area: BMP -1
D Soil Group
D Soil Group
Area: -
CN
D Soil Group
Area: AP -1 Post Devel.
D Soil Group
Description:
Area (SF)
Acres
CN
C
Description:
Area (SF)
Acres
CN
C
Description:
Area (SF)
Acres
CN
C
Impervious
0.000
98
0.96
0.000
Impervious
0.96
Driveway
0
0.000
Impervious
0.96
0.000
98
0.96
Roadway
33,568
0.771
98
0.96
Roadway
0
0.000
98
0.96
Roadway
33,568
0.771
98
0.96
Driveway
16,526
0.379
98
0.96
Driveway
0
0.000
98
0.96
Driveway
16,526
0.379
98
0.96
Parking Lot
0
0.000
98
0.96
Parking Lot
0
0.000
98
0.96
Parking Lot
0
0.000
98
0.96
Roof
68,184
1.565
98
0.96
Roof
0
0.000
98
0.96
Roof
68,184
1.565
98
0.96
Sidewalk
16,998
0.390
98
0.96
Sidewalk
0
0.000
98
0.96
Sidewalk
16,998
0.390
98
0.96
-
0
0.000
98
0.96
-
0
0.000
98
0.96
-
0
0.000
98
0.96
Total
135,276
3.106
Total
0
0.000
Total
135,276
3.106
Pervious
Pervious
Pervious
Lawn
171,380
3.934
34
0.68
Lawn
0
0.000
84
0.68
Lawn
171,380
3.934
84
0.68
Man. Pervious
66,758
1.533
80
0.6
Man. Pervious
0
0.000
30
0.6
Man. Pervious
70,889
1.627
80
0.6
Forest
0
0.000
77
0.54
Forest
0
0.000
7
0.54
Forest
0
0.000
77
0.54
Natural Wetland
0
0.000
77
0.54
Natural Wetland
0
0.000
7
0.54
Natural Wetland
0
0.000
77
0.54
Riparian Buffer
0
0.000
77
0.54
Riparian Buffer
0
0.000
77
0.54
Riparian Buffer
33,034
0.758
77
0.54
Open Water
0
0.000
30
0.15
Open Water
0
0.000
30
0.15
Open Water
0
0.000
30
0.15
-
0
0.000
30
0.15
-
0
0.000
3()
0.15
-
0
0.000
30
0.15
Total
238,138
5.467
Total
0
0.000
Total
275,303
6.320
BMP Area
0
0.000
30
0.15
BMP Area
0
0.000
30
0.15
BMP Area
0
0.000
30
0.15
BMP Area Water
5,600
0.129
30
0.15
BMP Area Water
0
0.000
30
0.15
BMP Area Water
5,600
0.129
30
0.15
Total Area
379,014
8.701
Total Area
0
0.000
Total Area
416,179
9.554
% Impervious
35.69%
% Impervious
0.00%
% Impervious
32.50%
Basin Weighted
87
0.75
Basin Weighted
79
0.581
Basin Weighted
87
0.73
Post- Develop.
Basin Area Calculations
Post- Develop.
D Soil Group
Pervious
Area: -
D Soil Group
Acres
CN
C
Description:
Area (SF)
Acres
CN
C
04
0.68
Man. Pervious
Impervious
0.095
80
0.6
Man. Pervious
0.000
98
0.96
Roadway
0
0.000
98
0.96
0.000
98
0.96
Driveway
0
0.000
98
0.96
0.000
98
0.96
Parking Lot
0
0.000
98
0.96
0.000
98
0.96
Roof
0
0.000
98
0.96
0.000
98
0.96
Sidewalk
0
0.000
98
0.96
0.000
98
0.96
-
0
0.000
98
0.96
0.000
-
0
Total
0
0.000
Total
37,165
Pervious
Pervious
Lawn
0
0.000
34
0.68
Lawn
0
0.000
04
0.68
Man. Pervious
4,131
0.095
80
0.6
Man. Pervious
0
0.000
30
0.6
Forest
0
0.000
77
0.54
Forest
0
0.000
77
0.54
Natural Wetland
0
0.000
77
0.54
Natural Wetland
0
0.000
7
0.54
Riparian Buffer
33,034
0.758
77
0.54
Riparian Buffer
0
0.000
77
0.54
Open Water
0
0.000
30
0.15
Open Water
0
0.000
30
0.15
-
0
0.000
30
0.15
-
0
0.000
30
0.15
Total
37,165
0.853
Total
0
0.000
BMP Area
0
0.000
30
0.15
BMP Area
0
0.000
30
0.15
BMP Area Water
0
0.000
30
0.15
BMP Area Water
0
0.000
30
0.15
Total Area
37,165
0.853
Total Area
0
0.000
% Impervious
0.00%
% Impervious
0.00%
Basin Weighted
77
0.55
Basin Weighted
30
-0.4
Total Area 0 SF
Table 2-2.
Values of S S Nt and Rational C for various cover conditions
(Based upon SS$ 1 9;
H.1t ale�rom, 2003 [2-1 Qj Hydrologic eso mams
Post Development AP -1

Basin Area Calculations
Post- Develop.
Area: BMP -1 Total Design
D Soil Group
Description:
Area (SF)
Acres
CN
C
Impervious
Roadway
33,568
0.771
98
0.96
Driveway
17,276
0.397
98
0.96
Parking Lot
0
0.000
98
0.96
Roof
68,934
1.583
98
0.96
Sidewalk
16,998
0.390
98
0.96
-
0
0.000
98
0.96
Total
136,776
3.140
Pervious
Lawn
171,380
3.934
84
0.68
Man. Pervious
111,758
2.566
80
0.6
Forest
9,902
0.227
77
0.54
Natural Wetland
0
0.000
77
0.54
Riparian Buffer
0
0.000
77
0.54
Open Water
0
0.000
30
0.15
-
0
0.000
30
0.15
Total
293,040
6.727
BMP Area
0
0.000
30
0.15
BMP Area Water
5,600
0.129
30
0.15
Total Area
429,816
9.867
% Impervious
31.82%
Basin Weighted
88
0.75

Stonewater SF -1
Basin Area Calculations
Post- Develop.
Basin Area Calculations
Post- Develop.
Basin Area Calculations
Post- Develop.
Area: BMP -2
D Soil Group
D Soil Group
Area: BMP -3
Area (SF)
D Soil Group
Area: Total AP -2
C
D Soil Group
Description:
Area (SF)
Acres
CN
C
Description:
Area (SF)
Acres
CN
C
Description:
Area (SF)
Acres
CN
C
Impervious
1.570
98
0.96
Roadway
Impervious
0.000
98
0.96
Driveway
Impervious
0.476
98
0.96
Driveway
Roadway
31,946
0.733
98
0.96
Roadway
67,789
1.556
98
0.96
Roadway
168,132
3.860
98
0.96
Driveway
14,105
0.324
98
0.96
Driveway
24,982
0.574
98
0.96
Driveway
59,841
1.374
98
0.96
Parking Lot
0
0.000
98
0.96
Parking Lot
0
0.000
98
0.96
Parking Lot
0
0.000
98
0.96
Roof
45,456
1.044
98
0.96
Roof
87,124
2.000
98
0.96
Roof
253,796
5.826
98
0.96
Sidewalk
15,128
0.347
98
0.96
Sidewalk
25,266
0.580
98
0.96
Sidewalk
64,327
1.477
98
0.96
-
0
0.000
98
0.96
-
0
0.000
98
0.96
-
0
0.000
98
0.96
Total
106,635
2.448
0.54
Natural Wetland
Total
205,161
4.710
0.54
Natural Wetland
Total
546,096
12.537
0.54
Riparian Buffer
Pervious
0.000
77
0.54
Riparian Buffer
Pervious
3.259
77
0.54
Open Water
Pervious
0.000
30
0.15
Open Water
Lawn
140,323
3.221
88
0.68
Lawn
270,111
6.201
84
0.68
Lawn
739,110
16.968
84
0.68
Man. Pervious
34,225
0.786
80
0.6
Man. Pervious
108,946
2.501
80
0.6
Man. Pervious
278,967
6.404
80
0.6
Forest
0
0.000
77
0.54
Forest
0
0.000
7
0.54
Forest
0
0.000
77
0.54
Natural Wetland
0
0.000
77
0.54
Natural Wetland
0
0.000
7
0.54
Natural Wetland
0
0.000
77
0.54
Riparian Buffer
0
0.000
77
0.54
Riparian Buffer
0
0.000
77
0.54
Riparian Buffer
141,969
3.259
77
0.54
Open Water
0
0.000
30
0.15
Open Water
0
0.000
38
0.15
Open Water
0
0.000
30
0.15
-
0
0.000
30
0.15
-
0
0.000
(.)
0.15
-
0
0.000
30
0.15
Total
174,548
4.007
Total
379,057
8.702
Total
1,160,046
26.631
BMP Area
0
0.000
30
0.15
BMP Area
0
0.000
30
0.15
BMP Area
0
0.000
30
0.15
BMP Area Water
4,000
0.092
30
0.15
BMP Area Water
9,000
0.207
30
0.15
BMP Area Water
23,000
0.528
30
0.15
Total Area
285,183
6.547
Total Area
593,218
13.618
Total Area
1,729,142
39.696
% Impervious
37.39%
% Impervious
34.58%
% Impervious
31.58%
Basin Weighted
88
0.761
Basin Weighted
87
0.75
1
Basin Weighted
86
0.73
Basin Area Calculations
Post- Develop.
Basin Area Calculations
Post- Develop.
Area: BMP -4
D Soil Group
Area: untreated Area
D Soil Group
Description:
Area (SF)
Acres
CN
C
Description:
Area (SF)
Acres
CN
C
Impervious
Impervious
Roadway
68,397
1.570
98
0.96
Roadway
0
0.000
98
0.96
Driveway
20,754
0.476
98
0.96
Driveway
0
0.000
98
0.96
Parking Lot
0
0.000
98
0.96
Parking Lot
0
0.000
98
0.96
Roof
83,336
1.913
98
0.96
Roof
37,880
0.870
98
0.96
Sidewalk
19,433
0.446
98
0.96
Sidewalk
4,500
0.103
98
0.96
-
0
0.000
98
0.96
-
0
0.000
98
0.96
Total
191,920
4.406
Total
42,380
0.973
Pervious
Pervious
Lawn
236,010
5.418
88
0.68
Lawn
92,666
2.127
83
0.68
Man. Pervious
101,970
2.341
80
0.6
Man. Pervious
33,826
0.777
80
0.6
Forest
0
0.000
77
0.54
Forest
0
0.000
77
0.54
Natural Wetland
0
0.000
77
0.54
Natural Wetland
0
0.000
7
0.54
Riparian Buffer
0
0.000
77
0.54
Riparian Buffer
141,969
3.259
77
0.54
Open Water
0
0.000
30
0.15
Open Water
0
0.000
38
0.15
-
0
0.000
30
0.15
-
0
0.000
30
0.15
Total
337,980
7.759
Total
268,461
6.163
BMP Area
0
0.000
30
0.15
BMP Area
0
0.000
30
0.15
BMP Area Water
10,000
0.230
30
0.15
BMP Area Water
0
0.000
30
0.15
Total Area
539,900
12.394
Total Area
310,841
7.136
% Impervious
35.55%
% Impervious
13.63%
Basin Weighted
87
0.741
Basin Weighted
82
0.65
Table 2 -;
Values of S S CN and Rational O for various cover conditions
(Based upon SOS, 1986)
H. Malcom, 2003 [2 -1 Qj Hydrologic esthsates'
Post Development AP -2

Basin Area Calculations
Post- Develop.
Basin Area Calculations
Post- Develop.
Basin Area Calculations
Post- Develop.
Basin Area Calculations
Post- Develop.
Pervious
Area: BMP -2 Total
D Soil Group
Area: BMP -3 Total
D Soil Group
Area: BMP -4 Total
D Soil Group
Area: BMP -3/4 Total
3.279
D Soil Group
Description: Area
(SF)
Acres
CN
C
Description:
Area (SF)
Acres
CN
C
Description: Area (SF)
Acres
CN C
Description: Area
(SF)
Acres
CN
C
Impervious
80
0.6
Man. Pervious
108,946
Impervious
80
0.6
Man. Pervious
222,927
Impervious
80
0.6
Man. Pervious
Impervious
4.842
80
0.6
Forest
Roadway
31,946
0.733
98
0.96
Roadway
134,109
3.079
98
0.96
Roadway
108,053
2.481
98 0.96
Roadway
136,186
3.126
98
0.96
Driveway
14,105
0.324
98
0.96
Driveway
25,732
0.591
98
0.96
Driveway
20,754
0.476
98 0.96
Driveway
45,736
1.050
98
0.96
Parking Lot
0
0.000
98
0.96
Parking Lot
0
0.000
98
0.96
Parking Lot
0
0.000
98 0.96
Parking Lot
0
0.000
98
0.96
Roof
45,456
1.044
98
0.96
Roof
88,624
2.035
98
0.96
Roof
102,836
2.361
98 0.96
Roof
170,460
3.913
98
0.96
Sidewalk
15,128
0.347
98
0.96
Sidewalk
32,330
0.742
98
0.96
Sidewalk
21,908
0.503
98 0.96
Sidewalk
44,699
1.026
98
0.96
-
0
0.000
98
0.96
-
0
0.000
98
0.96
-
0
0.000
98 0.96
-
0
0.000
98
0.96
Total
106.635
2.448
Total
280.795
6.446
30
0.15
Total
253.551
5.821
30
Total
397.081
9.116
0.000
30
Pervious
Pervious
Pervious
Pervious
Lawn
142,823
3.279
84
0.68
Lawn
272,611
6.258
84
0.68
Lawn
236,010
5.418
84
0.68
Lawn
506,121
11.619
84
0.68
Man. Pervious
34,225
0.786
80
0.6
Man. Pervious
108,946
2.501
80
0.6
Man. Pervious
222,927
5.118
80
0.6
Man. Pervious
210,916
4.842
80
0.6
Forest
28,287
0.649
77
0.54
Forest
51,019
1.171
77
0.54
Forest
69,737
1.601
77
0.54
Forest
0
0.000
77
0.54
Natural Wetland
0
0.000
77
0.54
Natural Wetland
0
0.000
7
0.54
Natural Wetland
0
0.000
77
0.54
Natural Wetland
0
0.000
77
0.54
Riparian Buffer
0
0.000
77
0.54
Riparian Buffer
0
0.000
77
0.54
Riparian Buffer
0
0.000
77
0.54
Riparian Buffer
0
0.000
77
0.54
Open Water
0
0.000
30
0.15
Open Water
0
0.000
30
0.15
Open Water
0
0.000
30
0.15
Open Water
0
0.000
3
0.15
-
0
0.000
30
0.15
-
0
0.000
30
0.15
-
0
0.000
30
0.15
-
0
0.000
30
0.15
Total
205,335
4.714
Total
432,576
9.931
Total
528,674
12.137
Total
717,037
16.461
BMP Area
0
0.000
30
0.15
BMP Area
0
0.000
30
0.15
BMP Area
0
0.000
30
0.15
BMP Area
0
0.000
3£:1
0.15
BMP Area Water
4,000
0.092
30
0.15
BMP Area Water
9,000
0.207
30
0.15
BMP Area Water
10,000
0.230
30
0.15
BMP Area Water
19,000
0.436
30
0.15
Total Area
315,970
7.254
Total Area
722,371
16.583
Total Area
792,225
18.187
Total Area
1,133,118
26.013
% Impervious
33.75%
% Impervious
38.87%
% Impervious
32.00%
% Impervious
35.04%
Basin Weighted
87
0.74
Basin Weighted
88
0.75
Basin Weighted
86
0.721
Basin Weighted
87
0.745
Basin Area Calculations
Post- Develop.
Basin Area Calculations
Post- Develop.
Area: BMP -1/2 Total
D Soil Group
Area: Post AP
1/2
D Soil Group
Description: Area (SF) Acres CN C
Description: Area (SF) Acres CN C
Impervious
Impervious
Roadway
65,514
1.504
98
0.96
Roadway
201,700
4.630
98
0.96
Driveway
30,631
0.703
98
0.96
Driveway
76,367
1.753
98
0.96
Parking Lot
0
0.000
98
0.96
Parking Lot
0
0.000
98
0.96
Roof
113,640
2.609
98
0.96
Roof
321,980
7.392
98
0.96
Sidewalk
32,126
0.738
98
0.96
Sidewalk
81,325
1.867
98
0.96
-
0
0.000
98
0.96
-
0
0.000
98
0.96
Total
241,911
5.554
Total
681,372
15.642
Pervious
Pervious
Lawn
311,703
7.156
84
0.68
Lawn
910,490
20.902
84
0.68
Man. Pervious
100,983
2.318
80
0.6
Man. Pervious
349,856
8.032
80
0.6
Forest
0
0.000
77
0.54
Forest
0
0.000
77
0.54
Natural Wetland
0
0.000
77
0.54
Natural Wetland
0
0.000
77
0.54
Riparian Buffer
0
0.000
77
0.54
Riparian Buffer
175,003
4.018
77
0.54
Open Water
0
0.000
30
0.15
Open Water
0
0.000
3 ()
0.15
-
0
0.000
30
0.15
-
0
0.000
30
0.15
Total
412,686
9.474
Total
1,435,349
32.951
BMP Area 0 0.000 30 0.15
BMP Area 0 0.000 30 0.15
BMP Area Water
9,600
0.220
30
0.15
BMP Area Water
28,600
0.657
30
0.15
Total Area
664,197
15.248
Total Area
2,145,321
49.250
% Impervious
36.42%
% Impervious
31.76%
Basin Weighted
88
0.75
Basin Weighted
87
0.73

POND -1
MINIMUM NORMAL POOL CALCULATIONS
Total Area 9.867 ac
Impervous Areas
Building 1.583 ac
roads - parking 1.168 ac
sidewalk -patio 0.39 ac
total 3.141 ac
% impervious 31.8 %
1" Rainfall Draw Down Calculation
Drainage Area
% Impervious
Pond N.P. elev
Rain
CN,
CN2
CN3
CN4
CN5
CN Average
Volume
9.867 ac
31.8 %
ft
1 in
98
98
98
84
0
88
IA=
Rv= 0.05 +0.009(IA) =
V= 3630(Rp)(Rv)(A)=
Draw Down
Depth Provided
Cd
9
Dia.
Ho
Ho /3
Q =CdA sq(2gH)
Draw Down Time
1.583 ac
1.168 ac
0.39 ac
6.726 ac
0 ac
9.87 ac
31.83
0.337
12053 cult
13035.0 SF Provided
SA /DA= 1.754 % per table 10 -3 NC State BMP
Manual -4ft Pond Depth
Min. SA= 0.173 ac
min. required 7539 sqft 0.17 acre
provided 13035 sqft 0.30 acre
average depth
Minimum Normal Pool Surface Area 1" Rainfall Draw Down Calculations

POND -2
MINIMUM NORMAL POOL CALCULATIONS
Total Area 7.254 ac
Impervous Areas
Building
1.044 ac
roads - parking
1.057 ac
sidewalk -patio
0.347 ac
total
2.443 ac
% impervious
33.7 %
1" Rainfall Draw Down Calculation
Drainage Area
% Impervious
Pond N.P. elev
Rain
CN,
CN2
CN3
CN4
CN5
CN Average
Volume
7.254 ac
33.7 %
ft
1 in
93
93
93
34
0
39
IA=
Rv= 0.05 +0.009(IA) =
V= 3630(Rp)(Rv)(A)=
Draw Down
Depth Provided
Cd
9
Dia.
Ho
Ho /3
Q =CdA sq(2gH)
Draw Down Time
1.044 ac
1.057 ac
0.347 ac
4.306 ac
0 ac
7.25 ac
33.75
0.354
9314 cult
10040.0 SF Provided
SA /DA= 1.311 % per table 10 -3 NC State BMP
Manual -4ft Pond Depth
Min. SA= 0.131 ac
min. required 5722 sqft 0.13 acre
provided 10040 sqft 0.23 acre
average depth
Minimum Normal Pool Surface Area 1" Rainfall Draw Down Calculations

POND -3 Table 40-1
MINIMUM NORMAL POOL CALCULATIONS Surface Area to Drainage Area Ratio for Permanent Pool Sizing to Achieve 85 Percent TSS
Total Area 16.583 ac
Impervous Areas
98
Building
2.035 ac
roads - parking
3.67 ac
sidewalk -patio
0.742 ac
total
6.447 ac
% impervious
38.9 %
1" Rainfall Draw Down Calculation
Drainage Area 16.583 ac
% Impervious 38.9 %
Pond N.P. elev ft
Rain 1 in
CN,
98
2.035 ac
CN2
98
3.67 ac
CN3
98
0.742 ac
CN4
84
10.136 ac
CN5
0
0 ac
CN Average
89
16.58 ac
Volume
7.0
8.0
IA=
Rv= 0.05 +0.009(IA) =
V= 3630(Rp)(Rv)(A)=
Draw Down
Depth Provided
Cd
9
Dia.
Ho
Ho /3
Q =CdA sq(2gH)
Draw Down Time
38.88
0.400
24072 cult
SA /DA= 1.967 % per table 10 -3 NC State BMP
Manual -4ft Pond Depth
Min. SA= 0.326 ac
min. required 14209 sqft 0.33 acre
provided 13000 sqft 0.30 acre
SA /DA= 1.39 % per table 10 -1 NC State BMP
Manual -4ft Pond Depth
Min. SA= 0.231 ac
min. required 10041 sqft 0.23 acre
provided 10583 sqft 0.24 acre
pollutant removal hitzeiencv in the Mountain n cans Piedmont regions, Adapted from Driscoll, 1986
Percent
Permanent Pool Average Depth (ft)
PermanentPool Average Depth (ft)
Impervious
Impervious
Cover
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10%
0.59
0.49
0.43
0.35
0.31
0.29
0.26
20%
0.97
0.79
0.70
0.59
0.51
0.46
0.44
30
1.34
1.08
0.97
0.83
0.70
0.64
0.62
40
1.73
1.4'3
1.25
1.05
0.90
0.82
1177
50%
106
1.73
1.50
1.30
1.09
1.00
0.92
60%
140
2.03
1.71
151
1.29
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
'fable 1t1 -3
Surface Area to Drainage Area Ratio for Permanent Pool Sizing to Achieve 90 Percent TSS
Pollutant Removal Efficiency in the Wuntain and P ec niont Regions, Adapted from Driscoll. 1986
Percent
PermanentPool Average Depth (ft)
Impervious
Cover
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
10%
0.9
0.8
0.8
0.7
0.6
0.6
0.5
0.5
0.5
0.5
0.4
0.4
0.4'
20 wo
1.5
1.3
1.1
1.0
1.0
0.9
0.9
0.9
0.8
0.8
0.8
0.7
0.7'
30%
1.9
1.8
1.7
1.5
1.4
1.4
1.3
1.1
1.0
1.0
1.0
0,.9
0.9'
40%
2.5
2.3
2.0
1.9
1.8
1.7
1.6
1.6
1.5
1.4
1.3
1.2
1.1'
50%
3.0
2.8
2.5
2.3
2.0
1.9
1.9
1.8
1.7
1.6
1.6
1.5
1.5'
60%
3.5
3.2
2.8
2.7
2.5
2.4
2.2
2.1
1.9
1.9
1.8
1.8
1.7'
70
4.0
37
3.3
3.1
2.8
27
2.5
2.4
2.2
2.1
2.0
2..0
1.9'
80%
4.5
4.1
3.8
3.5
3.3
3.0
2.8
2.7
2.6
2.4
2.3
2.1
2.0
90%
5.0
4.5
4.0
3.8
3.5
3.3
3.0
2.9
2.8
2.7
2.6
2.5
2.4'
Minimum Normal Pool Surface Area 1" Rainfall Draw Down Calculations

POND -4 Table 10-1
MINIMUM NORMAL POOL CALCULATIONS Surface Area to Drainage Area Ratio for Permanent Pool Sizing to Achieve 85 Percent TSS
Total Area 18,187 ac
Impervous Areas
Building
2,361 ac
roads-parking
2,957 ac
sidewalk-patio
0,503 ac
total
5,821 ac
% impervious
32.0 %
11" Rainfall Draw Down Calculation
Drainage Area
% Impervious
Pond N.P. elev
Rain
CN,
CN2
CN3
CN4
CN5
CN Average
Volume
18,187 ac
32,0 %
ft
1 in
98
98
98
84
0
88
IA=
Rv=0.05+0-009(IA)=
V=3630(RD)(Rv)(A)=
Draw Down
Depth Provided
Cd
9
Dia.
Ho
HO/3
Q=CdA sq(2gH)
Draw Down Time
2,361 ac
2,957 ac
0,503 ac
12,366 ac
0 ac
18,19 ac
32.01
0.338
22318 cult
SA/DA= 1,76 % per table 10-3 NC State BMP
Manual -4ft Pond Depth
Min. SA= 0.320 ac
min. required 13943 sqft 0.32 acre
provided 14044 sqft 0.32 acre
Pollutant Removal Efficiency in the N'Tountain and Piedmont Regions, Adapted from Driscoll, 1986
Percent
Permanent Pool Average Depth (ft)
Permanent Pool Average Depth (ft)
Impervious
Impervious
Cover
3.0
4.0
5.0
6.0
17.0
8.0
9.0
10%
0.59
0.49
0.43
0.35
0.31
0.29
0.26
20%
0.97
0.79
0,70
0.59
0.51
0.46
0.44
30'm"
1.34
1.08
0.97
0.83
0.70
0.64
0.62
40 '/6
1.73
1.4-3
1,25
1.05
0.90
0.82
077
50%
106
1.73
1.50
1.30
1.09
1.00
0.92
60%
140
2.03
1.71
151
1.29
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
'table 1(1-3
Surface Area to Drainage Area Ratio for Permanent Pool Sizing to Achieve 90 Percent TSS
Pollutant Removal Efficiency in the Wuntain and Piedniont Regions., Adapted from Driscoll, 1986
Percent
Permanent Pool Average Depth (ft)
Impervious
Cover
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
10%
0.9
0.8
0.8
0.7
0.6
0.6
0.5
0.5
0.5
0.5
0.4
0.4
0.4
20 wo
1.5
1.3
1.1
1.0
1.0
0.9
0.9
0.9
0.8
0.8
0.8
0.7
0.7
30%
1.9
I'S
1.7
1.5
1.4
1.4
1.3
1.1
1.0
1.0
1.0
0.9
0.9
40%
2.5
2.3
2.0
1.9
1.8
1.7
1.6
1.6
1.5
1.4
1.3
1.2
1.1
50%
3.0
2.8
2.5
2.3
2.0
1.9
1.9
1.8
1.7
1.6
1.6
1.5
1.5
60%
3.5
3.2
2.8
2.7
2.5
2.4
2.2
2.1
1.9
1.9
1.8
1.8
1.7
70 W/6
4.0
37
3.3
3.1
2.8
27
2.5
2.4
2.2
2.1
2.0
2.0
1.9
80%
4.5
4.1
3.8
3.5
3.3
3.0
2.8
2.7
2.6
2.4
2.3
2.1
2.0
90%
5.0
4.5
4.0
3.8
3.5
3.3
3.0
2.9
2.8
2.7
2.6
2.5
2.4i
Minimum Normal Pool Surface Area 1" Rainfall Draw Down Calculations

Hydraflow Hydrographs by Intelisolve
Thursday, Jul 11 2013, 1:44 PM
and No. 1 - BMP-1 Wetland
can Data
Pond storage is based on known contour areas. Average end area method used.
Stage / Storage Table
Stage (ft) Elevation (ft)
Contour area (sqft)
Incr. Storage {tuft) Total storage (cuft)
0.00 268:00
13,052
0 0
4.00 272M
19,567
65,238 65,238
Culvert / Orifice Structures
Weir Structures
[A] [B]
[C]
[D]
[A] [B]
[C] (D]
Rise (in) = 24.00 2.00
4.00
0.00
Crest Len (ft) = 9,42 10.00
0.00 0.00
Span (in) = 24.00 2.00
4:00
0.00
Crest El. (ft) = 270,30 271.00
0.00 0.00
No. Barrels = 1 1
1
0
Weir Coeff. = 333 2.60
0.00 0:00
Invert El. (ft) = 261.00 26&00 269.00
0.00
Weir Type = Riser Broad
--- ---
Length (ft) = 45.00 0.00
0.00
0:00
Multi-Stage = Yes No
No No
Slope (%) = 5.00 MIDI
0,00
0.00
N-Value = .013 .013
.013
.000
Orif. Coeff. = 0.60 0.60
0.60
0.00
Multi-Stage = n/a Yes
Yes
No
Exfiltration = 0.000 in/hr (Contour) Tailwater Elev. = 0.00 ft
Note: Culvert/Orifice outflows have been analyzed under inlet and outlet control.

Stage / Storage Table
Stage (ft) Elevation (ft) Contour area (sqft)
0.00 261,50 10,040
3.50 265.00 14,580
Incr. Storage (cult) Total storage (cuft)
0 0
43,085 43,085
Weir Structures
Thursday, Jul 11 2013, 1:44 PM
[A]
[B]
[C]
[D]
Rise (in)
= 24.00
2.00
4.00
0.00
Span (in)
= 24.00
2.00
4.00
0.00
No. Barrels
= 1
1
1
0
Invert El. (ft)
= 258,00
261.50
262.50
0.00
Length (ft)
= 34,00
0,00
0.00
0.00
Slope (0/0)
= 5.00
0.00
0.00
0,00
N-Value
= .013
.013
.013
.000
Orif. Coeff.
= 0.60
0.60
0.60
0.00
Multi-Stage
= n/a
Yes
Yes
No
Incr. Storage (cult) Total storage (cuft)
0 0
43,085 43,085
Weir Structures
Thursday, Jul 11 2013, 1:44 PM
Exfiltration = 0.000 in/hr (Contour) Tailwater Elev. = 0.00 ft
0,00 -
0
m
20,000
Note: Culvert/Orifice-outflows have been analyzed under inlet and outlet control.
24,000 28,000 32,000 36,000
40,000
Stage (ft)
4:00
3.00
2.00
1.00
0-00
44,000
Storage {tuft)
[A]
[B]
[C]
[D]
Crest Len (ft)
= 9,42
10.00
0.00
0.00
Crest El. (ft)
= 263.70
264.50
0:00
0.00
Weir Coeff.
= 3.33
2.60
0.00
0:00
Weir Type
= Riser
Broad
---
---
Multi-Stage
= Yes
No
No
No
Exfiltration = 0.000 in/hr (Contour) Tailwater Elev. = 0.00 ft
0,00 -
0
m
20,000
Note: Culvert/Orifice-outflows have been analyzed under inlet and outlet control.
24,000 28,000 32,000 36,000
40,000
Stage (ft)
4:00
3.00
2.00
1.00
0-00
44,000
Storage {tuft)

Hydraflow Hydrographs by Intelisolve
Stage (ft)
Thursday, Jul 11 2013, 1:44 PM
on No. 3 - BMP-3 et and
4.00
4.00
3.00
Pond Data
Pond storage is based on known contour areas. Average
end area method used,
Stage / Storage Table
Stage (it) Elevation (ft) Contour
area (sqft)
Intr. Storage {tuft) Total storage {cuff)
0.00 290,60
10,583
0 0
0.40 291.00
13,422
4,801 4,801
4.40 295.00
16,316
59,476 64,277
Culvert / Orifice Structures
Weir Structures
[A] [B]
[C]
[D]
[A] [B]
[C]
[D]
Rise (in) = 36.00 2.75
0:00
0.00
Crest Len (ft) = 10.99 15.00
0.00
0.00
Span (in) = 36.00 2.75
0.00
0:00
Crest El. (ft) = 292.00 294.00
0.00
0.00
No. Barrels = 1 1
0
0
Weir Coeff. = 3.33 2.60
0.00
0.00
Invert El. (ft) = 287.00 290.60
0.00
0.00
Weir Type = Riser Broad
---
- --
Length (it) = 5Z00 0.00
0.00
0.00
Multi-Stage = Yes No
No
No
Slope (%) = 2.69 0.00
0.00
0.00
N-Value = .013 .013
.000
.000
Crif. Coeff, = 0.60 0.60
0.00
0.00
Multi-Stage = n/a Yes
No
No
Exi'lltration = 0.000 in/hr (Contour) Tailwater Elev.
= 0.00 If
Note: Culvert/Orifice outflows have been analyzed
under inlet and outlet control.
Stage (ft) Stage 1 Storage
Stage (ft)
5.00
5.00
4.00
4.00
3.00
12,000 18,000 24,000 30,000
48,000 54,000
60,000
2.00
1.00

90��=
Stage (ft)
5.00
4.00
3.00
2.00
1.00
0,00
0
Stage (ft)
5:00
4:00
&00
2.00
1.00
0.00
90,000
Storage {cult)
[A]
[B]
[C]
[D]
[A]
[B]
[C]
[D]
Rise (in)
= 36.00
3.00
4.00
0.00
Crest Len (ft)
= 10.99
15.00
0,00
0.00
Span (in)
= 36.00
3.00
4.00
0.00
Crest El. (ft)
= 252.00
253.20
0.00
0.00
No. Barrels
= I
1
1
0
Weir Coeff.
= 3.33
2.60
0.00
0.00
Invert El. (ft)
= 245.50
249.60
250.70
0:00
Weir Type
= Riser
Broad
---
---
Length (ft)
= 45.00
0.00
0.00
0.00
Multi-Stage
= Yes
No
No
No
Slope (0/6)
= 1.78
0♦00
0.00
0.00
N-Value
= 013
.013
.013
.000
Orif. Coeff.
= 0.60
0.60
0.60
0.00
Multi-Stage
= n/a
Yes
Yes
No
Exfiltration = 0.000
in/hr (Contour) Tailwater Elev. = 0.00 ft
Note: Culvert/Orifice outflows have been analyzed under inlet and outlet control.
Stage (ft)
5.00
4.00
3.00
2.00
1.00
0,00
0
Stage (ft)
5:00
4:00
&00
2.00
1.00
0.00
90,000
Storage {cult)

BMP Design Post Development Calculations
Hydrograph Model
Inflow and BMP Outflow Hydrographs

15 17
13 21
it
?
S
IY
V� _
Legend
1§ 22
Hyd. Origin
Description
1 Rational
AP -1 Predevelop
2 SCS Runoff
AP -1 Predevelop
f
3 Rational
AP -2 Predevelop
4 SCS Runoff
AP -1 Predevelop
z
5 Rational
BMP -1 DA
6 Rational
AP -1 Untreated
7 Reservoir
BMP -1 Routing
8 Combine
AP -1 Postdevelop
9 SCS Runoff
BMP -1 DA SCS
10 SCS Runoff
Untreated SCS
11 Reservoir
BMP -1 SCS Routing
12 Combine
AP -1 SCS Postdevel
13 Rational
BMP -2 DA
14 Reservoir
BMP -2 Routing
15 Rational
BMP -3 Routing
16 Reservoir
<no description>
17 Rational
BMP -4 DA
18 Reservoir
BMP -4 Routing
19 Rational
AP -1 Untreated
20 Combine
AP -2 Postdevelopment
21 SCS Runoff
BMP -2 SCS Routing
22 Reservoir
BMP -2 SCS Routing
23 SCS Runoff
BMP -3 SCS Routing
24 Reservoir
BMP -3 SCS Routing
25 SCS Runoff
BMP -4 SCS
26 Reservoir
BMP -4 SCS Routing
27 SCS Runoff
AP -1 Untreated
28 Combine
AP -2 Post Development
Hydraflow Hydrographs Model
Project:
1340024 SWSF -1 bmp design.gpw
Thursday, Jul 11 2013, 12:59 PM

Hydraffow Hydrographs by Intelisolve
Hyd. No. 5
Runoff coeff.
BMP -1 DA
Tc by User
Hydrograph type
= Rational
Storm frequency
= 2 yrs
Drainage area
= 8.700 ac
Intensity
= 5.597 in/hr
OF Curve
= CARY NO AA 6-21 -11. 1 DF
Q (of S)
40 .00
am
0.00
0 5
— Hyd No. 5
BMP-1 DA
Time interval
1 min
Runoff coeff.
Tc by User
5.00 min
Asc/Rec limb fact
4/4
Hydrograph Volume = 43,823 cuft
10 15 20
25 30 35
Q (Cfs)
40.00
MR 4=1 1I
rr
000
40
Time (min)

Hydraflow Hydrographs by Intelisolve
Thursday, Jul 11 2013, 1:29 PM
Hyd. No. 5
BM P-1 DA
Hydrograph type
= Rational
Peak discharge
= 40.68 cfs
Storm frequency
= 5 yrs
Time interval
= 1 min
Drainage area
= 8.700 ac
Runoff coeff.
= 0.75
Intensity
= 6.234 in/hr
Tc by User
= 5.00 min
OF Curve
= CARY NOAA6-21-11.IDF
Asc/Rec limb fact
= 4/4
Q (cf S)
50.00
40.00
EM
it M11
im
000
0 5
— Hyd No. 5
ME,
10 15 20 25 30 35
Q (Cfs)
50.00
40.00
IM
0.00
40
Time (min)

Hydrailow Hydrographs by Intelisolve
Hyd. No. 5
Runoff coeff.
BMP-1 DA
Tc by User
Hydrograph type
= Rational
Storm frequency
= 10yrs
Drainage area
= 8.700 ac
Intensity
= 6.742 in/hr
OF Curve
= GARY NOAA6-21-11.IDF
Thursday, Jul 11 2013,1:29 PM
IM �W
Time interval
1 min
Runoff coeff.
0.75
Tc by User
5.00 min
1
Asc/Rec limb fact
-- 4/4
Hydrograph Volume = 52,789 cult
Q (Cfs) Hyd. No. 5 10 Yr
Q (Cfs)
50.00
50.00
40.00
40.00
30.00
30.00
10.00
0.00
0 5
— Hyd o.5
10 15 20 25 30

MM
ME
IM
0.00
0 5 10
— Hyd No. 7
15 19
— Hyd No. 5
24 29 34 39 44
1111111111 Req. for = 41,389 cuff
0
" NO#
30.00
10.00
— 0.00
48
Time (hrs)

Hydraflow Hydrographs by Intelisolve
Thursday, Jul 11 2013, 1:29 PM
Hyd. No. 7
BMP-1 Routing
Hydrographtype =
Reservoir
Peak discharge = 9.11 cfs
Storm frequency =
5 yrs
Time interval = 1 min
Inflow hyd. No. =
5
Max. Elevation = 270.69 ft
Reservoir name =
BMP-1 Wetland
Max. Storage = 43,941 cuff
Storage Indication method used.
Hydrograph Volume = 41,576 cult
EM
1 Ii
M
000
0 3
— Hyd No. 7
5 8 11 13 16 19 21
— Hyd No. 5 1111111111 Req. Stor = 43,941 cuff
U]
K no Will
Om
Um
n nn
27
Time (hrs)

Hydraflow Hydrographs by Intelisolve
Thursday, Jul 11 2013, 1:29 PM
Hyd. No. 7
BMP-1 Routing
Hydrograph type =
Reservoir
Peak discharge = 12.17 cfs,
Storm frequency =
10 yrs
Time interval = 1 min
Inflow hyd. No. =
5
Max. Elevation = 270.81 ft
Reservoir name =
BMP-1 Wetland
Max. Storage = 45,800 cuft
Storage Indication method used.
Hydrograph Volume = 45,544 cult
BMP-1 Routing
0 (Cfs) Hyd. No. 7 -- 10 Yr
50.00
Q (Cfs)
50.00
40.00
M
0.00 SW I 1 0.00
0.0 2.2 43 6.5 8.7 10.8 13.0 15.2 17.3 19.5 21.7
—
Time (hrs)
Hyd No. 7 — Hyd No. 5 '1 [ 1 [ 111111 Req. Star = 45,800 cuft

Hydraflow Hydrographs by Intelisolve
Hyd. No. 6
AP-1 Untreatel
Hydrograph type
Rational
it frequency
2 yrs
Drainage area
0.853 ac
Intensity
5.597 in/hr
OF Curve
CARY 1, d.... 6-21 -11.1
Q (Cfs)
3.00
PA I#
M
MM
�M.
Hyd. No,
Thursday, Jul 11 2013, 1:30 PM
MOW,
Time interval
1 min
Runoff coeff.
0.55
Tc by User
5.00 min
Asc/Rec limb fact
1/1
I
bi
3.00
M
M
n nn
10
Time (min)

IM
Hydraflow Hydrographs by Intelisolve
112111 VMW
•• .s type Rational
Storm frequency 5 yrs
Drainage area 0.853 ac,
Intensity 6.234 in/hr
OF Curve CARY NOAA6-21-11.IDF
EM
MW
9M
it
M
AP-1 Untreated
Thursday, Jul 11 2013, 1:30 PM
Time interval
1 min
Runoff coeff.
0.55
Tc by User
5.00 min
Asc/Rec limb fact
1/1
Hydrograph Volume = 877 cuff
0
Q (Cfs)
M
W61
n nn
10
Time (min)

Hydraflow Hydrographs by Intel solve
Hyd. No. 6
Runoff coeff
AP-1 Untreated
Tc by User
Hydrograph type
= Rational
Storm frequency
= 10yrs
Drainage area
= 0.853 ac,
Intensity
= 6.742 in/hr
OF Curve
= CARY NOAA6-21-11.IDF
Thursday, Jul 11 2013, 1:30 PM
Time interval
1 min
Runoff coeff
0.55
Tc by User
5.00 min
Asc/Rec limb fact
1/1
we]
M
IM
0.00
• .
M
Q (cfs)
4.00
M
im
n nn
10
Time (min)