1215 Long Ferry Road - Project Kodiak - Stormwater Report - 2019-0508

0 Stormwater Management
Calculations
Project Kodiak
SR 2120 (Long Ferry Road) &
SR 2182 (Unamed service road)
Prepared for:
NorthPoint Development
4825 NW 41" Street, Suite 500,
Riverside, MO 64150
Date: May, 2019
KHA Reference #: 013290000
Ki Hey \f\10- Horn
C Kimley-Horn and Associates, Inc. 2019
200 South Tryon, Suite 200, Charlotte, NC 28202
Phone: [phone]
NC FIRM #F-0102
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SEAL
045238
2019.05.13 16:30:35-04'00'

This document, together with the concepts and designs presented herein, as an instrument of service, is intended only for the specific
purpose and client for which it was prepared. Reuse of and improper reliance on this document without written authorization and
adaptation by Kimley-Horn and Associates, Inc. shall be without liability to Kimley-Horn and Associates, Inc.

STORMWATER MANAGEMENT &
EROSION AND SEDIMENT CONTROL CALCULATIONS
TABLE OF CONTENTS
1.0
BACKGROUND......................................................................................................................... 2
2.0
EXISTING CONDITIONS.......................................................................................................... 2
3.0
SOILS.........................................................................................................................................2
4.0
FLOODPLAIN/FLOODWAY/FIRM FLOOD INSURANCE RATE MAP .................................. 2
5.0
PERMANENT WATER QUALITY............................................................................................ 2
6.0
EROSION CONTROL................................................................................................................ 2
7.0
CONCLUSION........................................................................................................................... 3
APPENDIX A: SITE MAPS
SITE AERIAL MAP..................................................................................................... FIGURE 1
FEMA FIRMETTE...................................................................................................... FIGURE 2
APPENDIX B: WATERSHED MAPS
POST -DEVELOPMENT DRAINAGE AREA MAP ................................................... EXHIBIT 2
APPENDIX C: WATER QUALITY
SAND FILTER CALCULATIONS
UNDERDRAIN CALCULATIONS
APPENDIX D: SUPPLEMENTAL INFORMATION
USDA HYDRAULIC SOIL GROUPS
1

1.0 BACKGROUND
This report contains the approach and results of the stormwater analysis conducted for the proposed
distribution center (Project Kodiak) located in Rowan County, North Carolina. The approximately 88 +/-
acre project site is located at the south east corner of Long Ferry Road (SR 2120) and SR 2182 (unnamed
service road). The development is anticipated to consist of construction of a planned 690,000 SF building
with a planned 109,000 SF expansion, surrounding trailer parking and associate parking, and stormwater
management improvements.
This project consists of the following components:
■ Clearing and grubbing of the existing site;
■ Construction of the building and associated site appurtenances for operation (i.e. parking,
driveways and sidewalks);
■ Construction of the stormwater conveyance network and proposed Sand Filter SCM.
2.0 EXISTING CONDITIONS
The proposed project location is currently undeveloped land. The site was used as a borrow site for the
construction of the 1-85 widening. In the sites existing condition all stormwater flows south to Town
Creek, and is ultimately conveyed to the Yadkin -Pee Dee. The proposed project location is bordered by 2
existing streams. Approximately 101 ft of stream impacts, and 0.16 acres of wetland impacts have been
permitted through NCDWQ and the Army Corps of Engineers.
3.0 SOILS
On -site soils consist of (EnB) Enon fine sandy loam, 2 to 8 percent slopes, (EnC) Enon fine sandy loam, 8
to 15 percent slopes, (LdB2) Lloyd clay loam, 2 to 8 percent slopes, moderately eroded, (MeB2)
Mecklenburg clay loam, 2 to 8 percent slopes, moderately eroded, (MeC2) Mecklenburg clay loam, 8 to
15 percent slopes, moderately eroded, (SeB) Sedgefield fine sandy loam, 1 to 6 percent slopes and (Ud)
Udorthents, loamy soils. These soil groups have primarily C or C/D type hydraulic soil groups. Refer to
the appendix for the USDA SOIL CLASSIFICATION MAP.
4.0 FLOODPLAIN/FLOODWAY/FIRM FLOOD INSURANCE RATE MAP
Based on the effective FEMA Flood Insurance Rate Map Number 3710578000J, dated June 16, 2009 a
portion of the site appears to be in the unshaded Zone X: areas determined to be outside the 0.2%
annual chance floodplain. The remaining portion of the site appears to be in Zone AE: areas of special
flood hazards subject to flooding by the 1% annual chance flood. Though no impact is proposed to the
floodplain. A floodplain development permit has been obtained from Rowan County.
5.0 PERMANENT WATER QUALITY
In accordance with the North Carolina Department of Environmental Quality (NCDEQ) Stormwater
Design Manual, a stormwater quality control system designed to treat runoff of the first inch of rain for
85% average annual removal of total suspended solids will be required. This requirement will be met by
the construction of an on -site above ground sand filter.
The above ground sand filters have been designed in accordance with Part C-6 of the NCDEQ BMP
Design Manual, to treat the first inch of runoff from the development for water quality. The sand filters
have been designed with a media depth of 2.5 feet and minimum drawdown of 2 inches per hour to
2

achieve 85% TSS removal. The media depth of includes a 3" layer of washed stone, 1.5' of cleaned
washed "concrete" sand, 6" gravel layer for underdrain system, and a 6" perforated PVC. The water
quality volume (WQv) for the sand filter was calculated and in accordance with the design manual, was
multiplied by 0.75 because the water drains through the sand media at quicker rate. This sand filter has
been designed with a maximum ponding depth of 6 feet. Detailed calculations are included in the
appendix of this report.
It should be noted that the Geotechnical Report completed for the site by ECS indicated that the
groundwater table was well below the existing ground surface and was not encountered in any of the
borings taken during the geotechnical evaluation. Based on the subsurface exploration of the site, it was
determined that shallow groundwater would not affect the BMP design.
6.0 EROSION CONTROL
The project will require disturbance of approximately 60 acres. Proposed temporary erosion control
measures include a stone construction entrance, silt fence, Filtrexx° filter soxxTM, temporary diversion
ditches, coir-wattle check dams, temporary slope drains, rip -rap outlet protection, three skimmer
sediment basins, erosion control blanket, stone filter outlet ring, and catch basin inlet protection. All
measures have been designed in accordance with North Carolina Department of Environmental Quality
Erosion Control standards.
The erosion control plans have approved by Rowan County and a construction general permit has
been issued.
7.0 CONCLUSION
This report, the attached calculations, and the attached plans and details have been prepared to meet
the requirements as outlined by the North Carolina Department of Environmental Quality Stormwater
BMP Manual.
3

APPENDIX A: SITE MAPS

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APPENDIX C: WATER QUALITY CALCULATIONS

Kimley>) Horn
SAND FILTER CALCULATIONS
Project Name:
Project Kodiak
KHA Project #:
01329000
Designed by:
RBD
Date:
5/3/2019
Revised by:
Date:
Checked by:
Date:
Design Resource:
NCDEQ - Stormwater BMP Manual (2017)
Site Information
Sub Area Identification:
DA-A
Drainage Area (DA) =
48.61
Acres
2,117,469
Impervious Area (IA) =
34.11
Acres
1,486,028
Percent Impervious (I) =
70.2
%
SHWT Separation
Type of Sand Filter:
Open Bottom
SHWT Elevation =
628.0
ft
Top of Sand Filter Media Elevation =
635.5
ft
Sand Filter Media Depth =
18.0
in
Surface Area of Top of Sand Filter
30,500.0
sf
Surface Area of Bottom of Sand Filter
30,500.0
sf
SHWT Separation Required =
2.0
ft
SHWT Separation Provided =
6.0
ft
OK
Sand Filter Design
Design Storm Depth Rp =
1
inch
Determine Rv Value =
0.05 + .9 (I) =
0.68
WQV =
120,275
cf
WQVadj=
90,206
cf
Top of Sand Filter Media Elevation =
635.5
ft
Top of Ponding Elevation =
638.5
ft
Ponding Depth Provided =
3.0
ft
OK
Minimum Surface Area of Sand Filter =
30,068.7
sf
Provided Surface Area of Sand Champer =
30,500.0
Provided Surface Area of Sediment Chamber =
50,688.0
sf
OK
Total Provided Surface Area of Sand Filter =
81,188.0
sf
OK
Treatment Volume Required =
90,206.2
cf
Volume Stored in Sand and Sediment Chamber =
243,564.0
cf
OK

SF
SF
in/in

Kimley>>> Horn
UNDERDRAIN CALCULATIONS
Project Name:
Project Kodiak
KHA Project #:
01329000
Designed by:
RBD
Date: 5/3/2019
Revised by:
Date:
Checked by:
Date:
Compute Sand Filter Drawdown Discharge
Qo = Aft) (hf+df)l(df)
Surface Area of Sand Chamber (Af) =
30069
sf
Coefficient of Permeability (ft/day) =
4.0
ft/day
Filter Bed Depth (df) =
1.5
ft
Maximum Ponding Depth (hf) =
3.0
ft
Sand Filter Media Drawdown =
4.18
cfs
Computer Diameter of Single Pipe
D=16(Q *n/S^0. S)^ (3/8)
Diameter of single pipe (D) =
17.03
in
Roughness factor (n) =
0.01
Internal Slope (S) =
0.005
for a slope of 0.5%
Underdrain Design Flow (Qreq) =
8.4
cfs *multiplied by factor of safety 2
Orifice Flow
Number of Pipes =
4
Size of Pipe =
6
in
Required Design Flow Per Pipe (Qreq) per pipe=
2.1
cfs
Head (H) =
5.25
Orifice Coefficient =
0.6
Orifice Flow (Q) =
2.2
is Qreq <= Qorifice?
YES
SUFFICIENT UNDERDRAINS
Compute Perforation Capacity
Pipe Diameter =
6 in
Number of Pipes =
4
Length of Pipes =
950 LF
Rows of Perforations =
4
Perforations per Row =
3,508
Number of 3/8" Perforations =
14,031
50% of Perforations =
7,015
Capacity of each 3/8" Perforation =
0.008 cfs
Total Underdrain Capacity =
54.93 cfs OK

APPENDIX D: SUPPLEMENTAL INFORMATION

Hydrologic Soil Group —Rowan County, North Carolina
- v
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553700 553900 554100 554300 554500 554700 554900
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Map projection: Web Mercator Conermordinates: WGS84 Edge tics: lfrM Zone 17N WGS84
USDA Natural Resources Web Soil Survey 12/3/2018
Conservation Service National Cooperative Soil Survey Pagel of 4

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Hydrologic Soil Group -Rowan County, North Carolina
Hydrologic Soil Group
Map unit symbol
Map unit name
Rating
Acres in AOI
Percent of AOI
CcB
Cecil sandy loam, 2 to 8
B
0.1
0.0%
percent slopes
CeB2
Cecil sandy clay loam, 2
B
34.0
10.0%
to 8 percent slopes,
moderately eroded
CeC2
Cecil sandy clay loam, 8
B
8.0
2.4%
to 15 percent slopes,
moderately eroded
CfB
Cecil -Urban land
B
8.0
2.4%
complex, 2 to 8
percent slopes
ChA
Chewacla loam, 0 to 2
B/D
48.7
14.4%
percent slopes,
frequently flooded
EnB
Enon fine sandy loam, 2
C
27.1
8.0%
to 8 percent slopes
EnC
Enon fine sandy loam, 8
C
63.6
18.8%
to 15 percent slopes
LcD
Lloyd loam, 15 to 25
B
1.1
0.3%
percent slopes
LdB2
Lloyd clay loam, 2 to 8
B
61.0
18.0%
percent slopes,
moderately eroded
McB2
Mecklenburg clay loam,
C
22.5
6.7%
2 to 8 percent slopes,
moderately eroded
McC2
Mecklenburg clay loam,
C
15.3
4.5%
8 to 15 percent
slopes, moderately
eroded
PxD
Poindexter -Rowan
C
12.3
3.6%
complex, 15 to 25
percent slopes
RnC
Rion -Wedowee
C
0.1
0.0%
complex, 8 to 15
percent slopes
SeB
Sedgefield fine sandy
C/D
5.0
1.5%
loam, 1 to 6 percent
slopes
Ud
Udorthents, loamy
C
31.6
9.3%
VnB2
Vance sandy clay loam,
C
0.3
0.1 %
2 to 8 percent slopes,
moderately eroded
Totals for Area of Interest
338.8
100.0%
USDA Natural Resources Web Soil Survey 12/3/2018
Conservation Service National Cooperative Soil Survey Page 3 of 4

Hydrologic Soil Group —Rowan 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 or well
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
USDA Natural Resources Web Soil Survey 12/3/2018
Conservation Service National Cooperative Soil Survey Page 4 of 4

Precipitation Frequency Data Server
Page 1 of 4
NOAA Atlas 14, Volume 2, Version 3
Location name: Salisbury, North Carolina, USA
Latitude: 35.6917*, Longitude:-80.3987*
Elevation: 698.67 ft** im
*source ESRI Maps
**source USGS AW
POINT PRECIPITATION FREQUENCY ESTIMATES
G.M. Bonnin, D. Martin, B. Lin, T. Parrybok, M.Yekta, and D. Riley
NOAA, National Weather Service, Silver Spring, Maryland
PF tabular I PF graphical I Maps & aerials
PF tabular
PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)'
Average
recurrence interval (years)
Duration
���
10
25
501
100
200
500
1000
0.385
0.456
0.532
0.583
0.641
0.678
0-1-1 11
F-0-1-3-8-IF-0-1-6-6-10.784
5-min
(0.355-0.418)
(0.421-0.496)
(0.489-0.578)
(0.536-0.633)
(0.586-0.694)
(0.617-0.735)
(0.643-0.771)
(0.665-0.802)
(0.683-0.834)
(0.693-0.855)
0.615
0.729
0.852
0.933
1.02
1.08
1.13
1.17
1.21
1.24
10-min
(0.567-0.668)
(0.673-0.794)
(0.783-0.925)
(0.856-1.01)
(0.933-1.11)
(0.983-1.17)
1 (1.02-123)
1 (1.05-127)
1 (1.08-1.32)
(1.09-1.35)
0.769
0.916
1.08
1.18
1.29
1.37
1.43
1.48
1.53
1.55
15-min
(0.708-0.835)
(0.846-0.998)
(0.991-1.17)
1 (1.08-128)
1 (1.18-1.40)
1 (125-1.48)
1 (129-1.55)
1 (1.33-1.60)
1 (1.36-1.66)
1 (1.37-1.69)
1.05
1.27
1.53
1.71
1.92
2.06
2.19
2.30
2.43
2.51
30-min
(0.971-1.14)
1 (1.17-1.38)
1 (1.41-1.66)
1 (1.57-1.86)
1 (1.75-2.08)
(1.88-223)
(1.98-2.37)
(2.07-2.50)
(2.16-2.64)
(222-2.74)
60-min
1.31
1.59
1.96
2.23
2.55
2.79
3.01
3.22
3.48
3.66
(121-1.43)
(1.47-1.73)
(1.81-2.13)
(2.04-2.42)
(2.33-2.77)
(2.54-3.03)
(2.73-327)
(2.90-3.50)
(3.11-3.79)
(324-3.99)
1.52
1.84
2.28
2.61
3.04
3.35
3.66
3.95
4.32
4.60
2-hr
(1.40-1.65)
(1.69-2.00)
(2.10-2.49)
(2.39-2.84)
(2.77-329)
(3.03-3.63)
(329-3.97)
(3.53-4.30)
(3.82-4.71)
(4.02-5.01)
1.61
1.95
2.44
2.80
3.27
3.64
3.99
4.34
4.80
5.14
3-hr
(1.49-1.76)
(1.80-2.13)
(224-2.65)
(2.56-3.04)
(2.98-3.55)
(329-3.94)
(3.59-4.32)
(3.87-4.71)
(422-522)
(4.47-5.60)
1.96
2.35
2.94
3.39
3.98
4.45
4.91
5.38
6.00
6.47
6-hr
(1.80-2.13)
1 (2.17-2.57)
1 (2.70-321)
1 (3.10-3.69)
1 (3.62-4.32)
1 (4.02-4.82)
1 (4.40-5.32)
1 (4.77-5.83)
1 (525-6.51)
(5.59-7.02)
2.30
2.77
3.47
4.02
4.77
5.37
5.97
6.60
7.44
8.09
12-hr
(2.12-2.51)
(2.55-3.04)
(3.19-3.79)
(3.69-4.39)
(4.33-5.18)
(4.83-5.81)
(5.33-6.45)
(5.82-7.12)
(6.46-8.02)
(6.93-8.73)
2.75
3.32
4.16
4.82
5.72
6.43
7.15
7.89
8.90
9.69
24-hr
(2.57-2.96)
(3.11-3.57)
(3.89-4.47)
(4.50-5.18)
(5.31-6.14)
(5.96-6.90)
(6.61-7.67)
(728-8.47)
(8.17-9.57)
(8.86-10.4)
3.19
3.84
4.78
5.51
6.49
7.27
8.05
8.86
9.94
10.8
2-day
(2.98-3.41)
(3.60-4.11)
(4.47-5.11)
(5.14-5.88)
(6.04-6.93)
(6.75-7.77)
(7.46-8.60)
(8.18-9.47)
(9.14-10.6)
(9.89-11.6)
3.40
4.08
5.05
5.81
6.84
7.65
8.47
9.31
10.5
11.3
3-day
(3.18-3.62)
1 (3.83-4.36)
1 (4.73-5.39)
1 (5.43-620)
1 (6.37-729)
1 (7.11-8.16)
1 (7.86-9.05)
1 (8.61-9.96)
1 (9.63-112)
1 (10.4-122)
3.60
4.32
5.32
6.11
7.18
8.02
8.89
9.77
11.0
11.9
4-day
(3.38-3.84)
(4.06-4.61)
(4.99-5.67)
(5.72-6.51)
(6.70-7.65)
(7.47-8.56)
(825-9.49)
(9.04-10.4)
(10.1-11.7)
(10.9-12.8)
4.15
4.96
6.03
6.87
8.03
8.94
9.87
10.8
12.1
13.1
7-day
(3.92442)
(4.68-527)
(5.67-6.40)
(6.46-7.30)
(7.53-8.53)
(8.37-9.50)
(921-10.5)
(10.1-11.5)
(112-12.9)
(12.1-14.0)
4.73
5.63
6.76
7.64
8.83
9.76
10.7
11.6
12.9
13.9
10�1ay
(4.49-5.01)
(5.33-5.95)
1 (6.40-7.14)
(723-8.08)
(8.33-9.33)
(9.19-10.3)
(10.0-11.3)
(10.9-12.3)
(12.1-13.7)
(12.9-14.8)
6.37
7.51
8.87
9.94
11.4
12.5
13.7
14.8
16.4
17.6
20�1ay
(6.06-6.69)
1 (7.15-7.89)
1 (8.43-9.31)
1 (9.44-10.4)
1 (10.8-12.0)
1 (11.8-132)
1 (12.9-14.4)
1 (13.9-15.6)
1 (15.3-17.3)
1 (16.4-18.6)
7.88
9.26
10.8
11.9
13.4
14.6
15.8
16.9
18.4
19.6
30�1ay
(7.53-824)
1 (8.85-9.68)
1 (10.3-112)
1 (11.4-12.4)
1 (12.8-14.0)
1 (13.9-15.3)
1 (14.9-16.5)
1 (16.0-17.7)
1 (17.3-19.3)
1 (18.4-20.6)
9.91
11.6
13.2
14.5
16.2
17.4
18.6
19.8
21.4
22.5
45�ay
(9.51-10.3)
1 (11.1-12.1)
1 (12.7-13.8)
1 (13.9-15.1)
1 (15.5-16.8)
1 (16.6-182)
1 (17.7-19.4)
1 (18.8-20.7)
1 (202-22.4)
1 (21.3-23.6)
11.8
13.7
15.5
16.9
18.6
19.9
21.2
22.4
24.0
25.2
60�1ay
(11.4-12.3)
(132-14.3)
(14.9-16.1)
(162-17.5)
(17.9-19.3)
(19.1-20.7)
(20.3-22.0)
(21A-23.3)
(22.8-25.0)
(23.9-26.3)
Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS).
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90 % confidence interval. The probability that precipitation frequency estimates
(for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds
are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values.
Please refer to NOAA Atlas 14 document for more information.
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Precipitation Frequency Data Server
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PF graphical
PD5-based depth -duration -frequency (DDF) curves
Latitude: 35.6917', Longitude--90.39BY
30
25
C
20
7. 7. 7.
7. 7.
]% 7. ]% ]%
C
C
C
N
14 !�1
N
N 1�1
Q
❑ O i!'!
LO
Duration
25
C
t 20
1 2 5 10 25 50 100 200 500 1000
Average recurrence interval (years)
NOAA Atlas 14. Volume 2. Version 3 Created (GKT): Wed Dec 12 23.10:37 2018
Back to Top
Average recurrence
interval
(years)
— 1
2
— 5
1❑
25
50
100
200
500
1000
Duration
- 5anln
— 2-day
— 1Wnn
— 3-day
15-min
— 4-day
— 30-min
— 7-day
— 60-min
— 1O-day
— 2fir
— 20-day
— 3-rr
— 30-day
— Mr
— 45-day
— 12-hr
— 60-day
— 24-hr
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Precipitation Frequency Data Server
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Maps & aerials
Small scale terrain
Large scale terrain
Hristd
i�
_Ity+ -
Winston -Sal +al l
• • DLI I alll
Greensbor❑ •
` Rale-191
F-R IL�Yeh?A h •
*A,,heville NORTH AROLINA
* Char Otte Fayetteville
'Greenville 100km
7-1Omi
C t',11 TT-T C A T', i I I N
Large scale map
GreansharV
Durham
Raleial
North
(:arollina
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Precipitation Frequency Data Server
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Back to Top
US Department of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
National Water Center
1325 East West Highway
Silver Spring, MD 20910
Questions?: HDSC.Questions(rDnoaa.gov
Disclaimer
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Precipitation Frequency Data Server
Page 1 of 4
NOAA Atlas 14, Volume 2, Version 3
Location name: Salisbury, North Carolina, USA
Latitude: 35.6917*, Longitude:-80.3987*
Elevation: 698.67 ft** im
*source ESRI Maps
**source USGS AW
POINT PRECIPITATION FREQUENCY ESTIMATES
G.M. Bonnin, D. Martin, B. Lin, T. Parrybok, M.Yekta, and D. Riley
NOAA, National Weather Service, Silver Spring, Maryland
PF tabular I PF graphical I Maps & aerials
PF tabular
PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches/hour)'
Average
recurrence interval (years)
Duration
���
10
25
501
100
200
500
1000
4.62
5.47
6.38
7.00
7.69
8.14
8.53
8.86
9.19
9.41
5-min
(426-5.02)
(5.05-5.95)
(5.87-6.94)
(6.43-7.60)
(7.03-8.33)
(7.40-8.82)
(7.72-925)
1 (7.98-9.62)
1 (820-10.0)
1 (8.32-10.3)
3.69
4.37
5.11
5.60
6.13
6.49
6.78
7.02
7.27
7.41
10-min
(3.404 01)
(4.04-4.76)
(4.70-5.55)
(5.14-6.07)
(5.60-6.64)
(5.90-7.03)
(6.13-7.36)
1 (6.32-7.63)
1 (6.49-7.91)
3.08
3.66
4.31
4.72
5.18
5.47
5.72
5.91
6.10
6.20
15-min
(2.83-3.34)
(3.38-3.99)
(3.96-4.68)
(4.33-5.12)
(4.73-5.61)
(4.98-5.93)
(5.17-620)
(5.32-6.41)
(5.44-6.64)
(5.48-6.76)
2.11
2.53
3.06
3.42
3.83
4.12
4.38
4.60
4.86
5.02
30-min
(1.94-229)
(2.34-2.76)
(2.82-3.33)
(3.14-3.71)
(3.50-4.15)
(3.75-4.47)
(3.96-4.75)
(4.14-4.99)
(4.33-528)
(4.44-5.47)
1.31
1.59
1.96
2.23
2.55
2.79
3.01
3.22
3.48
3.66
60-min
(121-1.43)
(1.47-1.73)
(1.81-2.13)
(2.04-2.42)
(2.33-2.77)
(2.54-3.03)
(2.73-327)
(2.90-3.50)
(3.11-3.79)
(324-3.99)
0.758
0.918
1.14
1.31
1.52
1.67
1.83
1.97
2.16
2.30
2-hr
(0.698-0.825)
(0.844-1.00)
1 (1.05-124)
1 (120-1.42)
1 (1.38-1.65)
1 (1.52-1.82)
1 (1.65-1.99)
1 (1.76-2.15)
1 (1.91-2.36)
1 (2.01-2.51)
0.537
0.649
0.811
0.931
1.09
1.21
1.33
1.45
1.60
1.71
3-hr
(0.495-0.586)
(0.599-0.709)
(0.746-0.883)
(0.853-1.01)
(0.991-1.18)
1 (1.10-1.31)
1 (120-1.44)
1 (129-1.57)
1 (1.41-1.74)
1 (1.49-1.86)
0.326
0.393
0.491
0.565
0.665
0.743
0.820
0.898
1.00
1.08
6-hr
(0.300-0.356)
(0.362-0.429)
(0.451-0.536)
(0.518-0.615)
(0.605-0.722)
(0.671-0.805)
(0.735-0.889)
(0.797-0.973)
(0.877-1.09)
(0.934-1.17)
0.191
0.230
0.288
0.334
0.396
0.445
0.496
0.547
0.618
0.672
12-hr
(0.176-0.208)
(0212-0252)
(0.265-0.315)
(0.306-0.364)
(0.360-0.430)
(0.401-0.482)
(0.443-0.536)
(0.483-0.591)
(0.536-0.666)
(0.575-0.725)
0.115
0.138
0.174
0.201
0.238
0.268
0.298
0.329
0.371
0.404
24-hr
(0.107-0.123)
(0.129-0.149)
(0.162-0.186)
(0.187-0216)
(0.221-0.256)
(0248-0287)
(0276-0.320)
(0.303-0.353)
(0.340-0.399)
(0.369-0.434)
0.066
0.080
0.100
0.115
0.135
0.151
0.168
0.184
0.207
0.225
2-day
(0.062-0.071)
(0.075-0.086)
(0.093-0.106)
(0.107-0.123)
(0.126-0.144)
(0.141-0.162)
(0.155-0.179)
(0.170-0.197)
(0.190-0222)
(0206-0241)
0.047
0.057
0.070
0.081
0.095
0.106
0.118
0.129
0.145
0.158
3-day
(0.044-0.050)
(0.053-0.061)
(0.066-0.075)
(0.075-0.086)
(0.088-0.101)
(0.099-0.113)
(0.109-0.126)
(0.120-0.138)
(0.134-0.156)
(0.145-0.169)
0.038
0.045
0.055
0.064
0.075
0.084
0.093
0.102
0.114
0.124
4-day
(0.035-0.040)
(0.042-0.048)
(0.052-0.059)
(0.060-0.068)
(0.070-0.080)
0.078-0.089)
(0.086-0.099)
0.094-0.109)
(0.105-0.122)
0.114-0.133)
0.025
0.030
0.036
0.041
0.048
0.053
0.059
0.064
0.072
0.078
7-day
(0.023-0.026)
(0.028-0.031)
(0.034-0.038)
0.038-0.043)
(0.045-0.051)
0.050-0.057)
(0.055-0.062)
0.060-0.069)
(0.067-0.077)
0.072-0.084)
0.020
0.023
0.028
0.032
0.037
0.041
0.045
0.049
0.054
0.058
10�1ay
(0.019-0.021)
(0.022-0.025)
(0.027-0.030)
0.030-0.034)
(0.035-0.039)
0.038-0.043)
(0.042-0.047)
0.045-0.051)
(0.050-0.057)
0.054-0.062)
0.013
0.016
0.018
0.021
0.024
0.026
0.028
0.031
0.034
0.037
20�1ay
(0.013-0.014)
(0.015-0.016)
(0.018-0.019)
0.020-0.022)
(0.022-0.025)
0.025-0.027)
(0.027-0.030)
0.029-0.033)
(0.032-0.036)
0.034-0.039)
0.011
0.013
0.015
0.017
0.019
0.020
0.022
0.023
0.026
0.027
30�1ay
(0.010-0.011)
(0.012-0.013)
(0.014-0.016)
0.016-0.017)
(0.018-0.019)
0.019-0.021)
(0.021-0.023)
0.022-0.025)
(0.024-0.027)
0.026-0.029)
0.009
0.011
0.012
0.013
0.015
0.016
0.017
0.018
0.020
0.021
45�ay
(0.009-0.010)
(0.010-0.011)
(0.012-0.013)
0.013-0.014)
(0.014-0.016)
0.015-0.017)
(0.016-0.018)
0.017-0.019)
(0.019-0.021)
0.020-0.022)
0.008
0.010
0.011
0.012
0.013
0.014
0.015
0.016
0.017
0.017
60�1ay
(0.008-0.009)
(0.009-0.010)
(0.010-0.011)
0.011-0.012)
(0.012-0.013)
OA13-0.014)
(0.014-0.015)
0.015-0.016)
(OA16-0.017)
0.017-0.018)
Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS).
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90 % confidence interval. The probability that precipitation frequency estimates
(for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds
are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values.
Please refer to NOAA Atlas 14 document for more information.
Back to Top
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PF graphical
PD5-based intensity -duration -frequency (i4F) curves
Latitude- 35.69170, Longitude:-80.3987°
10.000
0.001 {
7.
l=
C
C
C
ry ✓� 1
N
[V ITl
Q
❑ O I[T
Duration
1.000
ZI
N
c
m
0.100
� 0.010
zt
00011 1 1 1 1 1 1 1 1 1
1 2 5 10 25 50 100 200 500 1000
Average recurrence interval (years)
NOAA Atlas 14. Volume 2. Version 3 Created (GKT); Wed Dec 12 23:11:27 2018
Back to Top
Average recurrence
interval
(years)
— 1
2
— 5
1❑
25
50
100
200
500
1000
Duration
5arYn
— 2-day
— 1Wnn
— 3-day
16arn
— 4-day
— 30-min
— 7-day
— 60-min
— 10-day
— 2fir
— 20-day
— 3-rr
— 30-day
— Mr
— 45-day
— 12-hr
— 60-day
— 24-hr
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Precipitation Frequency Data Server
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Maps & aerials
Small scale terrain
Large scale terrain
Hristd
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Winston -Sal +al l
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Greensbor❑ •
` Rale-191
F-R IL�Yeh?A h •
*A,,heville NORTH AROLINA
* Char Otte Fayetteville
'Greenville 100km
7-1Omi
C t',11 TT-T C A T', i I I N
Large scale map
GreansharV
Durham
Raleial
North
(:arollina
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Precipitation Frequency Data Server
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US Department of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
National Water Center
1325 East West Highway
Silver Spring, MD 20910
Questions?: HDSC.Questions(rDnoaa.gov
Disclaimer
https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=35.6917&lon=-80.3987&da... 12/12/2018