20200660 Ver 1_2020-05-19 Buffer Protection - SW Package_20200519

J MCADAMS
NORTH RIDGE APARTMENTS
Buffer Impact - SW Narrative
GENERAL DESCRIPTION
NARRATIVE > AVC-19000
The proposed development is located in the Neuse River Basin draining to Big Branch Creek. The site is not located
within a Watershed Protection Overlay. According to the N.C. Division of Water Quality Basin Wide Information
Management System (BIMS), Big Branch Creek [Stream Index # 27-33-17] is classified as C; NSW at this location. The
proposed development shall be subject to the stormwater management requirements set forth in Section 9.2.2. of
the City of Raleigh regulations. Per City of Raleigh regulations, stormwater management on this site shall address two
primary issues: (1) peak discharge rates and (2) water quality management.
The proposed project will result in a significant increase in peak flow rates to the downstream points of analyses. To
mitigate these impacts, the proposed stormwater management facilities have been sized such that post -development
peak flow rates are no greater than pre -development levels in the 2- and 10-year storm events on site. To meet the
City of Raleigh standards in Phase 1, one stormwater wet pond and one underground detention/StormFilter are
proposed. To meet the City of Raleigh standards in Phase 2, two stormwater wet ponds are proposed. Therefore, in
the full build -out condition, three stormwater wet ponds and one underground detention/StormFilter are proposed.
As the site is located within the Lower Neuse watershed, the target loading rate for TN is 10 Ibs/ac/yr. The site
nutrient calculations are divided into two nutrient boundaries corresponding to each phase boundary for Phases 1
and 2 individually with each meeting this requirement. Additionally, 85% TSS removal for the site will be required, as
is provided by the proposed StormFilter and stormwater wet ponds. A buydown payment will be required to offset
the remaining TN loading down to 3.6 Ibs/ac/yr.
DIFFUSE FLOW REQUIREMENTS
The proposed development will also result in the re-routing of existing stormwater that will create a new discharge to
the 50' Neuse River Buffer onsite. The accompanying exhibits, C9.1 and C9.2 show in more detail where these new
outlets will be located. Drainage to the outlets is comprised of a significant amount of existing impervious offsite, new
impervious associated with ROW areas that will remain untreated, and a significant amount of drainage from new
impervious that will first receive treatment from the proposed StormFilter system. Diffuse flow rules require new
discharges through the buffer to be non -erosive and/or provide 30% nutrient removal from an upstream SCM.
To address these requirements, each outlet will be directed at a velocity dissipator pad sized using the NYDOT method
and shown in the accompanying calculations. To ensure that the stone size will be appropriate, Bentley's FlowMaster
program was used to confirm depth of flow through the dissipator pad and then shear stress calculations performed to
ensure that the proposed NCDOT Class 'I' riprap will appropriately dissipate the energy from these outlets.
As an added measure, a small scour pool has been placed at the end of the dissipator pads to further dissipate energy
of outflow into the buffer. Water will then exit the pools in a dispersed manner into the adjacent low-lying buffer area,
to be planted with a wetland seed mix, prior to entering the stream channel. By dispersing flow through the created
wetland area, potential for additional nutrient uptake is created.
As previously stated, the outflow to each of these points contains a mixture of treated and bypassed flows. To offset
the impact of the bypassed flows, the proposed StormFilter will provide overtreatment (-50% TN removal) of new
impervious in combination with the stream adjacent wetland that will also provide supplementary nutrient removal.
creating experiences through experience 2905 Meridian Parkway, Durham, NC 27713 / 919. 361. 5000

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PROPOSED DRAINAGE AREA TO DISCHARGE POINT
TOTAL AREA 62.82 AC
IMPERVIOUS AREA (UNTREATED) = 998,865 SF MISSION
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'J
McADAMS
The John R. McAdams Company, Inc.
2905 Meridian Parkway
Durham, NC 27713
phone [phone]
fax [phone]
license number: C-0293
www.mcadamsco.com
CLIENT
NAME
ADDRESS
ADDRESS
PHONE: XXX. XXX. XXXX
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NO. DATE
PLAN INFORMATION
PROJECT NO.
AVC-19000
FILENAME
AVC19000-IMP EX.
CHECKED BY
RAS
DRAWN BY
HBD
SCALE
1"=150'
DATE
04.13.2020
SHEET
IMPERVIOUS AREA
TO DISCHARGE PT.
POST

Project
Project No.
Outlet ID
Flow, Q10_yr
Slope, S
Pipe Diameter, Do
Pipe Diameter, Do
Number of pipes
Pipe separation
Manning's n
DESIGN OF RIPRAP OUTLET PROTECTION WORKSHEET
North Ridge Apartments Date 5/19/2020
AVC-19000 Designer RAS
Buffer Outlets
50.0 cfs
0.50 %
36 inches
3.0 feet
1
0 feet
0.013
Fh!ure 8.06.b.1
25
20 one
V
15
w
V
10
7 on
41 7.1 ft/se
5
0
0 1 2 3 4 5 6 7 8 9 10
Pipe diameter (ft)
Zone from graph above =
2
Outlet pipe diameter
36 in.
Length =
18.0 ft.
Outlet flowrate
50.0 cfs
Width =
9.0 ft.
Outlet velocity
7.1 ft/sec
Stone diameter =
6 in.
Material =
Class B
Thickness =
22 in.
Zone
Material
Diameter
Thickness
Length
Width
1
Class A
3
9
4 x D(o)
3 x D(o)
2
Class B
6
22
6 x D(o)
3 x D(o)
3
Class 1
13
22
8 x D(o)
3 x D(o)
4
Class 1
13
22
8 x D(o)
3 x D(o)
5
Class 11
23
27
10 x D(o)
3 x D(o)
6
Class 11
23
27
10 x D(o)
3 x D(o)
7
Special study required
1. Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
2. Outlet velocity based on full -flow velocity
SCM - Rip Rap Outlet Protection Design5/19/2020

Buffer Outlets
Project Description
Friction Method Manning Formula
Solve For Normal Depth
Input Data
Roughness Coefficient
0.069
Channel Slope
0.06670
ft/ft
Left Side Slope
3.00
ft/ft (H:V)
Right Side Slope
3.00
ft/ft (H:V)
Bottom Width
9.00
ft
Discharge
50.00
ft3/s
Results
Normal Depth
0.93
ft
Flow Area
11.01
ft2
Wetted Perimeter
14.90
ft
Hydraulic Radius
0.74
ft
Top Width
14.60
ft
Critical Depth
0.89
ft
Critical Slope
0.07937
ft/ft
Velocity
4.54
ft/s
Velocity Head
0.32
ft
Specific Energy
1.25
ft
Froude Number
0.92
Flow Type
Subcritical
GVF Input Data
Downstream Depth 0.00 ft
Length 0.00 ft
Number Of Steps 0
GVF Output Data
Upstream Depth
0.00
ft
Profile Description
Profile Headloss
0.00
ft
Downstream Velocity
Infinity
ft/s
Upstream Velocity
Infinity
ft/s
Normal Depth
0.93
ft
Critical Depth
0.89
ft
Channel Slope
0.06670
ft/ft
Critical Slope
0.07937
ft/ft
Bentley Systems, Inc. Bentley FlowMaster V8i (SELECTseries 1) [08.11.01.03]
5/19/2020 10:33:56 AM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of 1

NORTH RIDGE APARTMENTS SHEAR STRESS CALCULATIONS
AVC-19000 Buffer Outlets
Shear Stress Calculations for Outlet Channel
where,
T = yds
y: specific weight of water (pcf)
d: depth of flow (ft)
s: channel gradient (ft/ft)
Input data:
y =
62.4 pcf
d =
0.93 ft
s =
0.067 ft/ft
Calculated Values:
T = 3.87 p/sf
T < 2.40 = Class'B' riprap
T < 4.80 = Class T riprap
T < 9.64 = Class'II' riprap
R. STUBBS, PE
5/19/2020

NORTH RIDGE APARTMENTS
AVC-19000
TN -Loading Input Data
POST -DEVELOPMENT - PHASE 1
NITROGEN EXPORT CALCULATIONS
Nitrogen Analysis Area [acres]
H. DEW, PE
1/22/2020
3uo-ua5111 iu
I Open
Wooded
Impervious
Pond
Total
To SCM A
2.31
0.00
8.97
0.00
11.28
To SCM B
0.65
0.00
2.51
0.17
3.34
Bypass Area
6.34
2.61
3.12
0.00
12.07
Totals= 9.3U Z.b1 14.bU U.1/ Zb.b9
TN -Loading Output Data -Ew
Sub -basin ID
Nitrogen Analysis Area
[acres]
TN -Load Before
Treatment [Ibs/yr]
% Removal
TN -Load After
Treatment [Ibs/yr]
BM Type
To SCM A
11.28
192.94
50%
96.47
StormFilter
To SCM B
3.34
54.30
30%
38.01
Wet Pond
Bypass Area
12.07
76.82
0%
76.82
/orals = 2b.b9
3Z4.Ub
Z11.3U
Total TN -Load After Treatment =
211.30
Ibs/yr
=
7.92
Ibs/ac/yr
Compute Estimated Offset Payment
Total Nitrogen Analysis Area =
26.69
acres
Max. TN -Export w/o Offset Payment =
96.08
Ibs/yr
3.60
Ibs/ac/yr
Computed TN -Export After Treatment=
211.30
Ibs/yr
7.92
Ibs/ac/yr
Total TN -Export Requiring Offset Payment=
115.22
Ibs/yr
4.32
Ibs/ac/yr
# of Years requiring offset =
30
yrs
Ibs
Total TN -Export Requiring Offset Payment =
3,456.7
NUTRIENT CALCULATIONS SHOWN HAVE BEEN INCLUDED IN THE
STORMWATER IMPACT ANALYSIS SUBMITTED TO THE CITY OF RALEIGH

NORTH RIDGE APARTMENTS POST -DEVELOPMENT - PHASE 1
AVC-19000 NITROGEN EXPORT CALCULATIONS
To SCM A
METHOD 2:
Quantifying TN Export from Residentail / Industrial / Commercial Developments when Footprints of all
Impervious Surfaces are shown.
STEP 1: Determine the area for each type of land use and enter in Column (2).
STEP 2: Total the areas for each type of land use and enter at the bottom of Column (2).
STEP 3: Multiply the areas in Column (2) by the TN export coefficients in Column (3) and enter in Column (4).
STEP 4: Total the TN exports for each type of land use and enter at the bottom of Column (4).
STEP 5: Determine the export coefficient for the site by dividing the total TN exportfrom uses at the bottom of
Column (4) by the total area at the bottom of Column (2).
(1)
(2)
(3)
(4)
Type of Land Cover
Area
TN export coeff.
TN export from use
[acres]
(Ibs/ac/yr)
(Ibs/yr)
Permanently protected undisturbed
0.00
0.6
0.00
open space (forest unmown meadow)
Permanently protected managed
2.31
1.2
2.77
open space (grass, landscaping, etc.)
Impervious surfaces (roads, parking
lots, driveways, roofs, paved storage
8.97
21.2
190.17
areas, etc.)
TOTAL
11.28
---
192.94
Total TN Export = 17.1 Ibs/ac/yr
impervious = 79.5%
<== Includes BMP Area
NUTRIENT CALCULATIONS SHOWN HAVE BEEN INCLUDED IN THE
STORMWATER IMPACT ANALYSIS SUBMITTED TO THE CITY OF RALEIGH
H. DEW, PE
1/22/2020

NORTH RIDGE APARTMENTS POST -DEVELOPMENT - PHASE 1
AVC-19000 NITROGEN EXPORT CALCULATIONS
To SCM 8
METHOD 2:
Quantifying TN Export from Residentail / Industrial / Commercial Developments when Footprints of all
Impervious Surfaces are shown.
STEP 1: Determine the area for each type of land use and enter in Column (2).
STEP 2: Total the areas for each type of land use and enter at the bottom of Column (2).
STEP 3: Multiply the areas in Column (2) by the TN export coefficients in Column (3) and enter in Column (4).
STEP 4: Total the TN exports for each type of land use and enter at the bottom of Column (4).
STEP 5: Determine the export coefficient for the site by dividing the total TN exportfrom uses at the bottom of
Column (4) by the total area at the bottom of Column (2).
(1)
(2)
(3)
(4)
Type of Land Cover
Area
TN export coeff.
TN export from use
[acres]
(Ibs/ac/yr)
(Ibs/yr)
Permanently protected undisturbed
0.00
0.6
0.00
open space (forest unmown meadow)
Permanently protected managed
0.83
1.2
0.99
open space (grass, landscaping, etc.)
Impervious surfaces (roads, parking
lots, driveways, roofs, paved storage
2.51
21.2
53.31
areas, etc.)
TOTAL
3.34
---
54.30
Total TN Export = 16.3 Ibs/ac/yr
impervious = 75.3%
<== Includes BMP Area
NUTRIENT CALCULATIONS SHOWN HAVE BEEN INCLUDED IN THE
STORMWATER IMPACT ANALYSIS SUBMITTED TO THE CITY OF RALEIGH
H. DEW, PE
1/22/2020

NORTH RIDGE APARTMENTS POST -DEVELOPMENT - PHASE 1 H. DEW, PE
AVC-19000 NITROGEN EXPORT CALCULATIONS 1/22/2020
Bypass Area
METHOD 2:
Quantifying TN Exportfrom Residentail / industrial/ Commercial Developments when Footprints of all
Impervious Surfaces are shown.
STEP 1: Determine the area for each type of land use and enter in Column (2).
STEP 2: Total the areas for each type of land use and enter at the bottom of Column (2).
STEP 3: Multiply the areas in Column (2) by the TN export coefficients in Column (3) and enter in Column (4).
STEP 4: Total the TN exports for each type of land use and enter at the bottom of Column (4).
STEP 5: Determine the export coefficient for the site by dividing the total TN exportfrom uses at the bottom of
Column (4) by the total area at the bottom of Column (2).
(1)
(2)
(3)
(4)
Type of Land Cover
Area
TN export coeff.
TN export from use
[acres)
(Ibs/ac/yr)
(Ibs/yr)
Permanently protected undisturbed
0.00
0.6
0.00
open space (forest unmown meadow)
Permanently protected managed
8.95
1.2
10.74
open space (grass, landscaping, etc.)
Impervious surfaces (roads, parking
lots, driveways, roofs, paved storage
3.12
21.2
66.08
areas, etc.)
TOTAL
12.07
---
76.82
Total TN Export = 6.4 Ibs/ac/yr
impervious = 25.8%
NUTRIENT CALCULATIONS SHOWN HAVE BEEN INCLUDED IN THE
STORMWATER IMPACT ANALYSIS SUBMITTED TO THE CITY OF RALEIGH

LEGEND
I= SITE BOUNDARY
PHASE 1
■ ■ NUTRIENT BOUNDARY
SUBBASINS TO SCM
■
7■■■■■■■■■■'
OPEN AREA
WOODED AREA - BYPASS
IMPERVIOUS AREA - TREATED
7ENEWIMPERVIOUS AREA - BYPASS
1 /
1
EXISTING \
SANDY FORKTR/W)
\
\ (VARIABLE WIDTH
EXISTING
THE LAKES DRIVE
1 11
I \
�. EXISTING
'\ SPRING FOREST RD
(VARIABLE WIDTH R/W)
EXISTING
LAKE HILL DRIVE
J)HAINUA UKIVt
(VARIABLE WIDTH R/W)
GRAPHIC SCALE
0 100 200 400
1 inch = 200 ft.
F—
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NORTH RIDGE APARTMENTS POST -DEVELOPMENT - PHASE 2 H. DEW, PE
AVC-19000 NITROGEN EXPORT CALCULATIONS 1/23/2020
TN -Loading Input Data
Nitrogen Analvsis Area [acres]
3uo-ua5111 iu
I Open
Wooded
I Impervious
I Ponci
I Total
To SCM C
2.28
0.00
3.77
0.33
6.38
To SCM D
1.98
0.00
2.17
0.16
4.31
Bypass Area
0.95
0.68
1.38
0.00
3.01
Totals = 5.22 U.bx /.32 U.49 13. /U
TN -Loading Output Data
Sub -basin ID
Nitrogen Analysis Area
[acres]
TN -Load Before
Treatment [Ibs/yr]
% Removal
TN -Load After
Treatment [Ibs/yr]
BMP Type
To SCM C
6.38
83.05
30%
58.14
Wet Pond
To SCM D
4.31
48.65
30%
34.06
Wet Pond
Bypass Area
3.01
31.15
0%
31.15
1 orals = 13. /U 1bL.65
Total TN -Load After Treatment = 123.34 Ibs/yr
= 9.00 Ibs/ac/yr
Compute Estimated Offset Payment
Total Nitrogen Analysis Area =
13.70
acres
Max. TN -Export w/o Offset Payment =
49.34
Ibs/yr
3.60
Ibs/ac/yr
Computed TN -Export After Treatment=
123.34
Ibs/yr
9.00
Ibs/ac/yr
Total TN -Export Requiring Offset Payment=
74.00
Ibs/yr
5.40
Ibs/ac/yr
# of Years requiring offset =
30
yrs
Total TN -Export Requiring Offset Payment =
2,220.1
Ibs
1L3.34
NUTRIENT CALCULATIONS SHOWN HAVE BEEN INCLUDED IN THE
STORMWATER IMPACT ANALYSIS SUBMITTED TO THE CITY OF RALEIGH

NORTH RIDGE APARTMENTS POST -DEVELOPMENT - PHASE 2
AVC-19000 NITROGEN EXPORT CALCULATIONS
To SCM C
METHOD 2:
Quantifying TN Export from Residentail / Industrial / Commercial Developments when Footprints of all
Impervious Surfaces are shown.
STEP 1: Determine the area for each type of land use and enter in Column (2).
STEP 2: Total the areas for each type of land use and enter at the bottom of Column (2).
STEP 3: Multiply the areas in Column (2) by the TN export coefficients in Column (3) and enter in Column (4).
STEP 4: Total the TN exports for each type of land use and enter at the bottom of Column (4).
STEP 5: Determine the export coefficient for the site by dividing the total TN exportfrom uses at the bottom of
Column (4) by the total area at the bottom of Column (2).
(1)
(2)
(3)
(4)
Type of Land Cover
Area
TN export coeff.
TN export from use
[acres]
(Ibs/ac/yr)
(Ibs/yr)
Permanently protected undisturbed
0.00
0.6
0.00
open space (forest unmown meadow)
Permanently protected managed
2.61
1.2
3.14
open space (grass, landscaping, etc.)
Impervious surfaces (roads, parking
lots, driveways, roofs, paved storage
3.77
21.2
79.92
areas, etc.)
TOTAL
6.38
---
83.05
Total TN Export = 13.0 Ibs/ac/yr
impervious = 59.1%
<== Includes BMP Area
NUTRIENT CALCULATIONS SHOWN HAVE BEEN INCLUDED IN THE
STORMWATER IMPACT ANALYSIS SUBMITTED TO THE CITY OF RALEIGH
H. DEW, PE
1/23/2020

NORTH RIDGE APARTMENTS POST -DEVELOPMENT - PHASE 2
AVC-19000 NITROGEN EXPORT CALCULATIONS
To SCM D
METHOD 2:
Quantifying TN Export from Residentail / Industrial / Commercial Developments when Footprints of all
Impervious Surfaces are shown.
STEP 1: Determine the area for each type of land use and enter in Column (2).
STEP 2: Total the areas for each type of land use and enter at the bottom of Column (2).
STEP 3: Multiply the areas in Column (2) by the TN export coefficients in Column (3) and enter in Column (4).
STEP 4: Total the TN exports for each type of land use and enter at the bottom of Column (4).
STEP 5: Determine the export coefficient for the site by dividing the total TN exportfrom uses at the bottom of
Column (4) by the total area at the bottom of Column (2).
(1)
(2)
(3)
(4)
Type of Land Cover
Area
TN export coeff.
TN export from use
[acres]
(Ibs/ac/yr)
(Ibs/yr)
Permanently protected undisturbed
0.00
0.6
0.00
open space (forest unmown meadow)
Permanently protected managed
2.14
1.2
2.57
open space (grass, landscaping, etc.)
Impervious surfaces (roads, parking
lots, driveways, roofs, paved storage
2.17
21.2
46.08
areas, etc.)
TOTAL
4.31
---
48.65
Total TN Export = 11.3 Ibs/ac/yr
impervious = 50.4%
<== Includes BMP Area
NUTRIENT CALCULATIONS SHOWN HAVE BEEN INCLUDED IN THE
STORMWATER IMPACT ANALYSIS SUBMITTED TO THE CITY OF RALEIGH
H. DEW, PE
1/23/2020

NORTH RIDGE APARTMENTS POST -DEVELOPMENT - PHASE 2 H. DEW, PE
AVC-19000 NITROGEN EXPORT CALCULATIONS 1/23/2020
Bypass Area
METHOD 2:
Quantifying TN Exportfrom Residentail / industrial/ Commercial Developments when Footprints of all
Impervious Surfaces are shown.
STEP 1: Determine the area for each type of land use and enter in Column (2).
STEP 2: Total the areas for each type of land use and enter at the bottom of Column (2).
STEP 3: Multiply the areas in Column (2) by the TN export coefficients in Column (3) and enter in Column (4).
STEP 4: Total the TN exports for each type of land use and enter at the bottom of Column (4).
STEP 5: Determine the export coefficient for the site by dividing the total TN exportfrom uses at the bottom of
Column (4) by the total area at the bottom of Column (2).
(1)
(2)
(3)
(4)
Type of Land Cover
Area
TN export coeff.
TN export from use
[acres)
(Ibs/ac/yr)
(Ibs/yr)
Permanently protected undisturbed
0.00
0.6
0.00
open space (forest unmown meadow)
Permanently protected managed
1.63
1.2
1.96
open space (grass, landscaping, etc.)
Impervious surfaces (roads, parking
lots, driveways, roofs, paved storage
1.38
21.2
29.19
areas, etc.)
TOTAL
3.01
---
31.15
Total TN Export = 10.4 Ibs/ac/yr
impervious = 45.8%
NUTRIENT CALCULATIONS SHOWN HAVE BEEN INCLUDED IN THE
STORMWATER IMPACT ANALYSIS SUBMITTED TO THE CITY OF RALEIGH

LEGEND
I= SITE BOUNDARY
PHASE 2
■ ■ NUTRIENT BOUNDARY
SUBBASINS TO SCM
■
,■■■■■■■■■■'
OPEN AREA
WOODED AREA - BYPASS
IMPERVIOUS AREA - TREATED
7ENEWIMPERVIOUS AREA - BYPASS
7000= POND AREA
1
EXISTING \
SANDY FORKS RD \
\ (VARIABLE WIDTH R/W)
�T� 1
v
EXISTING
THE LAKES DRIVE
EXISTING
I AKF HII I nRI\/F
EXISTING
SHANDA DRIVE
(VARIABLE WIDTH R/W)
\ 1 n— C
EXISTING
SPRING FOREST RD
\ P �
GRAPHIC SCALE
0 100 200 400
1 inch = 200 ft.
Z o0 rn
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0
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E E
g g L
v m
L N
O
N
L
H
C
N
-