SW3170603 - Larkin Subidivision Phase 6B (4)

Storm Drain/Erosion Control Project Report
for
Larkin Golf Club Ph. 613
Iredell County, North Carolina
Date: May 19, 2017
Client:
Dependable Development, Inc.
2649 Brekonridge Centre Drive, Suite 104
Monroe, North Carolina 28110
Engineer:
QR. Joe Harris & Associates. Inc.
Engineering • Surveying • Pluuig • Management
127 BEV CASEY DRIVE, SUITE 101
FORT MILL, SC 29708
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- Report -
Initial Submittal to City of Statesville
& Iredell County

Larkin Golf Club Ph. 6B
Storm Drain/Erosion Control Project Report
SECTION I: Project Summary
• Project Summary
SECTION II: Project Information
Vicinity Map
• Soil Classification Map
• USGS Topographic Map
FEMA Map
• Rainfall Data
SECTION III: Storm Drain Calculations
• Storm System 100
o Plan View
o Pipe Design— 10 -year Rational Method
o Inlet Spread— 1 -year Storm Event
o Rip -Rap Apron Calculation
Storm System 200
o Plan View
o Pipe Design— 10 -year Rational Method
o Inlet Spread — 1 -year Storm Event
o Rip -Rap Apron Calculation
• Storm System 300
o Plan View
o Pipe Design— 10 -year Rational Method
o Inlet Spread — 1 -year Storm Event
o Rip -Rap Apron Calculation
• Storm System 400
o Plan View
o Pipe Design— 10 -year Rational Method
o Inlet Spread — 1 -year Storm Event
o Rip -Rap Apron Calculation
Storm System 500
o Plan View
o Pipe Design — 10 -year Rational Method
o Inlet Spread — i -year Storm Event
o Rip -Rap Apron Calculation
Table of Contents

Larkin Golf Club Ph. 6B
Storm Drain/Erosion Control Project Report
• Storm System 600
o Plan View
o Pipe Design — 10 -year Rational Method
o Inlet Spread—I -year Storm Event
o Rip -Rap Apron Calculation
SECTION IV: Erosion & Sediment Control
• Initial Phase Erosion Control Basins Calculations
• Final Phase Erosion Control Basin Calculation
SECTION V: Pre & Post Analysis
• Pre & Post -Development Summary
• Pre & Post -Development Curve Numbers
• Pre & Post -Development TC Values
• 2, 10, 50, 100 -year Storm Event Hydrograph Analysis
SECTION VI: SNIP Analysis
• BMP Curve Number Calculations
• Nater Quality Calculations
• Hydrograph Analysis
SECTION VII: Appendix A
• Pre -Development Drainage Area Map
• Post -Development Drainage Area Map
• Storm Drainage Area Map
• BMP Drainage Area Maps (Included in Construction Plans)
Table of Contents

Larkin Colf Club Ph. 6B
Storm Drain/Erosion Control Project Report Section 1: Project Summary
Project Summary

Larkin Golf Course Ph. 6B
Storm Drain/Erosion Control Project Report Project Summary
A. PROJECT DESCRIPTION
Larkin Golf Course Subdivision is a Planned Development located west of U.S. Interstate 77 off Amity Hill
Road in Iredell County, North Carolina. This phase of the project (Phase 613), will encompass
approximately 35.32 acres, consisting of 92 single family residential lots.
This property consists of a combination of Tax Parcel Numbers; 4743621050, 474518148 & 4743530075
and is located under Deed Book 2390, Pages 5-6 &Deed Book 2448, Pages 2052 - 2056.
The predominant soil types within the proposed limits of construction are Cecil sandy clay loam and
Pacolet sandy loam; all of which belong to the Soil Hydraulic Group B (as taken from the Web Soil Survey
2.1— National Cooperative Soil Survey by NRCS).
The disturbance for the site will encompass roughly 35 acres. The site will encounter two phases of
erosion and sediment control management, beginning with an initial phase. Initial clearing, grading and
infrastructure placement will occur during this phase. The last phase (stabilization or final phase) will
include paving and final seeding/stabilization of the site. Given the amount of grading work that will take
place, the majority of the erosion control is best managed through the use of temporary sediment
basins and skimmer basin; with temporary and permanent diversion ditches to help channel flow to the
aforementioned basins. Accessory features such as inlet protection, silt fence, and concentration outlets
will also be used to assist with bypass areas and smaller areas of concentrated flow.
Five proposed sediment basins (#100-#400 & #600) and one temporary skimmer basin (Basin #500) have
been specified for the initial phase erosion control. Sediment Basins #100-#400 will remain active during
E the final phase of erosion control and sediment management. All storm drainage systems will be
installed per plans with no stubbed pipes or temporary pipes.
B. STORMWATER MANAGEMENT
Pre and Post development flows were analyzed to determine if storm water detention would be
necessary for the higher level storm events. The pre -development analysis point was conducted along
the stream which runs west/east of the property for Area #1. The Post development analysis was
analyzed at the same location and includes a bypass area as well as BMP Wet Ponds #'s 100, 200, 300 &
400.
Pre and Post Development runoff summaries can be found in Section V of this project report and they
show that we meet the pre -development runoff rates for the 2 -year, 10 -year, 50 -year and 100 -year
storm events.
C. WATER QUALITY
There are 4 main drainage areas that make up the combined flow from Larkin Golf Course Ph. 6B.
One, being located at the North West part of the site depositing collected runoff into BMP #100, Second
area being located at the South West part of the site and deposited into BMP #200, the third being
located at the middle North part and deposited into BMP #300 and the fourth and final area located at
the North East and placed into BMP #400.

I
Larkin Golf Course Ph. 6B
Storm Drain/Erosion Control Project Report Project Summary
All four of these drainage areas have been designed to collect the bulk of the sites impervious runoff
and treat it before releasing downstream. The BMP water quality design can be found in Section VI of
the report booklet.
D. STORM DRAINAGE SYSTEM
An analysis of all receiving storm drainage systems within the Larkin Golf Course Subdivision Ph. 6B was
conducted to verify that the drainage systems would not surcharge or be beyond capacity due to the
drainage areas and the storm water runoff from the site for the 10 -year, 24-hour rainfall intensity. All of
the street catch basins have been evaluated for inlet spread using the 1 -year, 24-hour rainfall intensity,
and all yard inlets have been evaluated for sump capacity using the 25 -year, 24-hour rainfall intensity.
For the analysis of the infrastructure, RJH utilized field-run/Aerial topography to evaluate each of the
storm drain systems. Storm systems #'s 100, 200, 400, & 600 are new systems within the limits of the
Larkin Golf Course Subdivision Phase 6B. Storm systems #'s 300 and 500 are existing systems from
Phases 4 and 6A and have been carried through the site and parts added too system within the limits of
the Larkin Golf Course Subdivision Phase 6B. This storm system functions within the design parameters
set forth by the City of Statesville, Iredell County and NCDOT for both pipe design and inlet spread
capacity.
The system has been fitted with a properly sized riprap apron at the outflow for energy dissipation. All
proposed storm drain profiles have been designed to limit the hydraulic gradient line (HGL) to no closer
than 0.5' below the weir/rim elevation.
End Report !

Larkin Colf Club Ph. 6B
Storm Drain/Erosion Control Project Report Section Z: Project Information
Overall Project Information

VICINITY MAP N.T.S.
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3 Hydrologic Soil Group—Iredell County, North Carolina a
(2506-Laknn Phase 6i3)
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Map profeclJon: Web Mermtor Comer won'irons: VIGS84 Edge is UTh9 Zone 17N ME84
USDA Natural Resources Web Sod Survey 4/212017
w Conservation Service National Cooperative Sod Survey Page 1 of 4

Hydrologic Soil Group—Iredell County, North Carolina
(2506 -Laken Phase 6B)
MAP LEGEND
Area of Interest (AOI)
0
Area of Interest (AOI)
Soils
CID
Soil Rating
Polygons
0
A
Q
AID
Q
B
Q
BID
0
C
Q
CID
Q
D
0
Not rated or not avallabie
Soil Rating
Lines
,.,
A
Rads
AID
ry
e
US Routes
BID
ry
C
t J
CID
Local Roads
D
r
Not rated or not available
Soil Rating
Points
I'
A
El
AID
IS
B
IS
BID
MAP INFORMATION
© C
The soil surveys that comprise your AOI were mapped at
1 12,000.
CID
® D
Warning. Soil Map may not be valid at this scale.
0 Not rated or not available
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
Water Features
line placement The maps do not show the small areas of
Streams and Canals
contrasting soils that could have been shown at a more detailed
scale.
Transportation
Rads
Please rely on the bar scale on each map sheet for map
Interstate Highways
measurements.
US Routes
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Major Roads
Coordinate System: Web Mercator (EPSG 3857)
Local Roads
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
Background
distance and area. A projection that preserves area, such as the
Aerial Photography
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below
Soil Survey Area: Iredell County, North Carolina
Survey Area Data: Version 21, Sep 15, 2015
Soil map units are labeled (as space allows) for map scales
1.50,000 or larger
Date(s) aerial images were photographed- Feb 11, 2011—Mar 2,
2011
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident
USDA Natural Resources Web Soil Survey 4/2/2017
Conservation Service National Cooperative Soil Survey Page 2 of 4

Hydrologic Soil Group—Iredell County, North Carolina
Hydrologic Soil Group
2506-Lakrin Phase 6B
Hydrologic Soil Group—Summary by Map Unit— lredell County, North Carolina (NC097)
Map unit symbol
Map unit,name
Rating
Acres in AOI
,Percpnt of AOI
CeB2
Cecil sandy clay loam, 2
B
2.8
8.0%
to 6 percent slopes,
moderately eroded
CeC2
Cecil sandy clay loam, 6
B
3.3
9.2%
to 10 percent slopes,
moderately eroded
ChA
Chewacla loam, 0 to 2
BID
3.2
9.0%
percent slopes,
frequently Flooded
DrB
Dorian fine sandy loam,
C
07
2.0%
0 to 6 percent slopes,
rarely flooded
PaF
Pacolet sandy loam, 25 ;
B ( 0.9
2.6%
to 45 percent slopes
PcB2
Pacolet sandy clay
I B
0.0
0.0%
loam, 2 to 6 percent
slopes, moderately
eroded
PcC2
Pacclet sandy clay
8
0.0
0.0%
loam, 6 to 10 percent
slopes, moderately
eroded
PcD2
Pacolet sandy clay
B
72
20.4%
loam, 10 to 15 percent
slopes, moderately
eroded
PcE2
Pacolet sandy clay
B
1.5
4.3%
loam, 15 to 25 percent
slopes, moderately
eroded
PrF
Poindexter -Rowan
C 1.5
4.1%
complex, 25 to 45
percent slopes
RiD
Rion sandy loam, 8 to C
4.1
11.6%
15 percent slopes
RiF
Rion sandy loam, 15 to
C
8,3
236%
45 percent slopes
i
RtA Riverview and Toccoa
B
1.8
5.0%
soils, 0 to 2 percent
slopes, occasionally
flooded
W Water
0.1
0.2%
Totals for Area of Interest
35.4
100.0%
USDA Natural Resources Web Sod Survey 41212017
+� Conservation Service National Cooperative Soil Survey Page 3 of 4 ;

Hydrologic Soil Group—Iredell 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 (AID, BID, and CID). 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 (AID, BID, or CID), 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
2506-Lakrin Phase 6B
4 - USDA Natural Resources Web Soil Survey 4/7/2017
Conservation Service National Cooperative Soil Survey Page 4 of 4

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NOAA Atlas 14, Volume 2, Version 3
Location name: Statesville, North Carolina, USA'
Latitude: 35.7451', Longitude: -80.8648° if
Elevation: 808.83 ft"
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POINT PRECIPITATION FREQUENCY ESTIMATES
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5.63
3 -hr
(1 47-1 74)
1 (1 78-2 11) 11
(2 23-2 65)
(2 57-31}6) 11
(3 03-3 63)
(3 38-4 08)
1 (3 72-4.54) 11
(4.05-5 03)
1 (4 49-5 70) 11
(4 83-6.25)
1.96
2.37
2.97
--3.4-4--IF-4.08
4.60
5.12
5.66
6.41
6.99
6 -hr
(1 82-213)
1 (2 19-2 58)
1 (2 74-3 23) 11
(317-3.74)
(3.73-4 43)
(417-4 99)
1 (4 60-5 57) 11
(5 02-6 17)
1 (601-768)
2.36
2.85
3.57
4.15
4.94
5S8
624
6.92
7.86
8.61
12 -hr
(218-256)
(264-31o)
(3 30-3 89)
(382-450)
(4 52-535)
11 (505-603)
(SW -674)
1 (6 13-7.48)
1 (6 86-8 51)
1 (740-934)
2.82
3.42
432
5.03
6.00
6.78
7.58
8.40
9.53
10.4
24 -hr
(2.62-3 OS)
(317-3 70)
(4 CO -4 68)
(4 64-5.44)
(5 52-6 49)
(6.22-7.33)
(6592-8201
(765-9.10)11(863-103)
(939-113)
3.
4.
5.02
5.80
6.87
7.71
8.57
9.44
10.6
11.6
2 -day
(3 08-3-3 58
3 72-4-4 34) 11
(4.65-543)
5 37-6 27) 11
(6.33-7-42)
1 (786-9 26)
1 (8 63-10 2)
9 68-11 5) 11
(10 5-12.6)
3.53
4.25
5.2-97F--S.-10---1F--7.-20---j
8.07
8.95
9.85
11.1
12.0
3 day
(3 28-3 80)
1 (3 96-4 59)
1 (4 92-5.71)
(5 66-6.58)
(6 55-7.77)
1 (7.44-8.703)
0 (823-9.666) 11
(9 03-10 6)
1 (101-12.0) 11
(10 9-13 0)
3.74
4.49
5.56
6.40
7.53
8.4210.3
11.5
12.5
4 -day
(3 49-4 02)
(4 20-4 84)
(5 18-5 99)
(5 95-6.89)
(6 97-811)
(7.78-9 08)
(8 59-10.1)
(9 42-11 1)
(10.5-12 5)
(114-1351
4.31
5.15
6.27
7.t4
8.31
9.23
10.711.1
12.3
13.3
7 day
(4 05-4 61)
(4 84-5 51)
(5 88-6 71)
(6 69-7.64)
(7-75-8.891
(8.59-9.87)
(942-10.9)11F(10.3-11
9)
(11 4-13.3)
(122-1431
4.94
5.89
7.07
7.98
9.18
10.1
11.0
12.0
13.2
14.2
10 -day
(4 66-5 26)
(5 55-6 27)
(6 66-7 53)
(7 51-8 491
(8.61-9 77)
1 (9.46-108)
10 3-11.81 11
(112-12-8)
12 3-14 1)
(131-15.1)
6.63
7.84
9.25
10.4
1-1 -8-1
12.9 14.1
15.211
16.7
7-1
17.9
20 -day
(6 29-6 99)
(7 44-8 26) 11
(8 77-9-75)
(9 80-10.9) 11
(11.2-12.4)
11 (12-2-137) (13-2-14%
(143-16 . 1)
1 (15 6-17 7) 11
(16 7-19 0)
8.21
9.fi5
11.1
123
13.7
14.8 F15.8
16.9
18.2
19.2
30 -day
(7.84-8 60)
(9 22-101)1
(10 6-11 7)
(11.7-128)
(13.0-14-4)
11 (14.1-15.5) 1 (15 0-16 61
(16.0-17 7)
1 (17 2-19 2)
11 (18 1-20.3)
10.3
12.1
13.714.9
16.5
17.6 18.7
19.8
21.1
22.1
45 day
(991-108)
(11.6-126)
(13.1-143)
(143-15.6)
(15.7-17.2}
(16.8-18.4) (178-196) 11
(188-207)
1 (20.1-222)
1 (210-233)
12.3
14 4
16-1
` 17.5
19.2
20.d 21.7
22.8
24.3
25.4
60 -day
(11 8-12 8}
(13 8-15 O)
(15 5-16 8)
j (16.8-182)
(18 4-2(1.0)
(19.6-21.3) (237-22-6)
(21 8-23 8)
(23 2-25 4)
(242-266)
Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial dura:w series (PDS)
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval The pmbabdity that precipitation frequency estimates (far a
given duration and average recurrence interval) will be greater than the upper bound (cc less than the lover bound) is 5% Estimates at upper bounds are not
checked against probable maximum precipitation (PNIP) estimates and may be higher that currentty valid PfAP va'ues
Please refer to NOAA Atlas 14 document for more information
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Precipitation Frequency Data Server
PF graphical
PDS -based depth -duration -frequency (DDF) curves
Lati_ude- 35.751°, Longitude= -80.8648°
30
25
70
n.
0
30
25 ----
20
a
C 15-
C-1
CL
0
1 2 5 10 25 50 100 200 500 1000
Average recurrence interiat (y --ars)
NOAA Atlas 14, Volume 2. Version 3 Created tGM11T;_ Fri Apr 2S 14 -CO -23 2017
Back to Top
Paye 2 of 4
Average recurrence
enteral
(ye _ars)
— f
— 2
— 5
t0
— 25
s0
100
200
500
loco
Duration
mn
mea
m mm
P C - - N &.Ii-;?
— 15 -min
— '-day
.a
i7? -9 7
0
p p
— Go -min
O
O O Ul O
N M Q 4?
.-, - to 10
Duration
— 3 -hr
— 30 -Jay
— 64hr
30
25 ----
20
a
C 15-
C-1
CL
0
1 2 5 10 25 50 100 200 500 1000
Average recurrence interiat (y --ars)
NOAA Atlas 14, Volume 2. Version 3 Created tGM11T;_ Fri Apr 2S 14 -CO -23 2017
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Paye 2 of 4
Average recurrence
enteral
(ye _ars)
— f
— 2
— 5
t0
— 25
s0
100
200
500
loco
Duration
2-dav
— 10 -mm
— 3 -day
— 15 -min
— '-day
— 30 -mm
— T -day
— Go -min
— t D-day
— 2 -hr
— 2o•aay
— 3 -hr
— 30 -Jay
— 64hr
— 35 -day
— 12 -hr
— 6c -day
— 2l -hr
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Precipitation Frequency Data Server
Maps & aerials
Small scale terrain
` Staiesvill
Gofn� b"' nal t
• Barium - _ -
spling —
v� ; 3Nm,
in
Lame scale terrain
Large scale map
Greensboro I jr
,t � �; Garoiu�❑ �'
F a
1Ookm
OMI {
f
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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 `Nest Hignvay
Sdoer 5cnr9 MD 20510
Questions' HDSC Questions(d_)noaa goy
Disclaimer
http://hdse.nws.noaa.o,ov/hdsc/pfds/pfds�rintpage.html?Iat=35.74� 1&lon=-80.8648&data._. 4!28/2017

Precipitation Frequency Data Server
Page 1 of 4
NOAA Atlas 14, Volume 2, Version 3
Dui
Location name: Statesville, North Carolina, USA'
Latitude: 35.7451°, Longitude: -80.8648°
DI
Elevation. 808.83 ft"
+�_
'source ESRI Maps
10
" source USGS
50
POINT PRECIPITATION FREQUENCY ESTIMATES
G M Scnnin, D Martin B Lin T Parrrbok, 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)1
Dui
Average recurrence interval (years)
raton
1
�0
10
25
50
100
200
500
1000
{
4.52
5 34
6.28
6.94
7.72
827
8.77
9.24
9.78
10.2
5 -min
I
(416-4.91) 11
(4 94-5 83) 1
1 (637-755)
(703-839)
(749-899)
1 (788-956) 11
(823-10.1)
1(860-108)
1 (884-113)
3.61
4 27
5.02
5 55
6.15
6.58
6.977---732--F.7.73
8.01
10 min
(333-392)
(3.95-4 66)
(462-5.47)
(;09-603) 03)
(5.60-6 68)
(5 96-7.16)
(627-760)
(653-801)
(680-851)
(696-8 86)
3.01
3.58
4.24
4.68
5 20
5.56
5.88
6.16
6.49
6.70
15 -min
11
(278-3 27) 11
(3 31-3 90)
1 (3 90-4 61)
1 (4 29-5 08)
11 (4 74-5 64)
1 (5 03-6 04)
1 (5 28-6 40)
1 (5 49-6 74)
1 (5 71-7 14)
1 (5 82-7.42)
2.06
2.47
3.01
3.39
3.85
4.18
4.50
4.79
5.16
5.43
30 -min
(1.90-224)
1 (2.29-2.70)
(277-3 28)
(311-368)
(351-418)
(379-4.55)
1 (4.05-490)
1 (427-524)
1(454-!568) 11
(4.72-600)
1'29
1.55
1.93
2.21
2 56
2.83
3.10
3.36
3.71
3.96
60 -min
(1 19-1.40) 11
(143-169) 11
(1 78-2 10)
1 (2 03-2 40)
(2.34-2 78)
(2 57-3 08)
1 (2 79-3 38)
1 (3 00-3 68)
1 (3 26-4 08)
(3 44-4 38)
0-746
0.904
1.13
130
1.53
1.71
1.89
2.06
2.30
2.48
2 -hr
(0686-0810)
(0832-0986)
1 (1 04-123) 11
(119-142)
(1.39-167)
(154-186)
1 (169-206)
1 (183-226)
1 (2.01-254) 11
(214-2.75)
0.532
0.643
0.808
0.935
1.11
1.25
1.38
1.53
1.72
1.87
3 -hr
1(0491-0580)1(0594-0704)
(0744-0883)1(0
857-102)
1001-121)
(1.12-136)
1 (124-151)
1 035-167)
1 (150-190) 11
(161-208)
0.328
0.395
0.496
0.575
0.682
0.768
0.855
0.945
1.07
1.17
6 -hr 11
(0 303-0 356)
(0 366-0 431)
(0 458-0 540)
(0 529-0 625
(0 623-0 740
(0 696-0 833)
(0 768-0 930
1(0.839-103)
(0 933-1 17)
0.196
0 236
0.297
-O-.3-45---IF-0-4-10---]F-O--4-63-
0.516
0.574
0.653
0.715
12 -hr
1(0181-0212)1(0219-0257)1(0274-0323)1(0317-0374
1(0375-0444
(0 419-0.501)
(0 464-0 559)
(0.509-0 621)
0 569-0 706)
(0 614-0 776)
0-117
0.142
0.180
0.210
0.250
0 283
0.316
0.350
0.397
0.434
24 -hr
(0 109-0127)
(0 132-0 154)
0.167-0 195)
(0 193-0 227
(0 230-0 2711(0259
-0305)1(0.289-0341)1(()319-0379)
0360-0431)1(0.391-0472)1
F 0.083
F 0-107F
2 -day
(0 064 0 075)
(0 077 0 090)
0 097 01 13)
(0 10.121
102 01131
(0 132 0 155
(0 148 01174)
(0 164' 08193)
(D.180 0 213)
kO 202-0 240)
(0 2108-0 262)
0.049
0.059
0.073
0.085
0.100
0.112
0.124
0.137
0.154
0.167
3 -day
(0 046-0 053)
(0 055-0.064)
(0 068-0 079)
(0 079-0 091
1(0092-0108
(0 103-0 121)
(0.114-0.134)
(0 125-0.148)
0.140-0.167)
(0 152-0181)
0.039
0.047
F-05-58-7-0--0-67
0.078
0.088
0.097
0.107
0.120
0.130
4 day
10 036-0 042)
(0.044-0 050)
0 054-0.062)1(0
062-0 072
(0 073-0 084
(0 081-0.095)1(0.090-0
105)
(0.098-0 115)
k0A10-0130)1((1119-0
141)
0.026
0.031
0.037
0 043
0 049
0.055
0.060
0.066
0.073
0.079
7 -day
(0 024-0 027)
(0 029-0 033)
(0 035-0 040)
(0 040-0 045
(0 046-0 053)
(0 051-0.059)
(0 056-0 065)
(0 061-0 071)
0.068-0 079)
((3 073-0 085)
0.021
0.025
0.029
0 033
0 038
0.042
0.046
0.050
0.055
0.059
10 day
0 019-0 022)
('70
(0023-0.0261
0 028-0 031)
(0 031-0 035)
(0 036-0 041
0 039-0 045)
(0 043-0 049
(0 046-0 053)
0 (151-0 059)
(0 055-0 0631
0.014
0.016
0.019
0.022
0 025
0.027
0.029
0.032
0.035
0.037
20 day
(0 013-0 015y
(0 015-0.017)
0 018-0 020)
(0 020-0 023)
(0 023-0 026)
(0 025-0 028 )
( 0 028-0 031
{ 0 0300 033)
0 Q33-0.037)
(0 035-0 040)
30 -day
0.011
011-0.012)
0.013
013-0 014)
0.015
0 015-0.016)
0,017
018
0019
018-0 020)
0 021
020-0 022)
0.022
021-0 023)
0.023
0 022-0 025)
0.025
0 024-0 027)
0.027
028)
(0
0.010
(0
0.011
(
0.013
(0.016-0
0 014
(0
0.015
(0
0.016
(0
0.017
0.018
0.020
(0.025-0
0.021
45 day
1(0009-0010)11(0011-0
012)
(0 012-0 013)
(0 013-0 014)
(0 015-0016)j(0
016-0017)1(0
017-0 018)
(0 017-0019)
0 019-0 021 i
(0 019-0 022)
60-day0.009
(D COS 0 009)
0.010
(0 010-0 010)
0 011
0 011-0 012)
0.012
(0 012-0 013
0.013
(0 013-0 014)
0.014
(0 014-0 015)
0.015
(0 014-0 016j
0.016
(0 015-0.Dt
6617
0 016-0.018)
0.018
(0.017-0 018)
' Preaplation 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
PF graphical
?DS -based intensity -duration -frequency {IDF} curves
Latitude 35.7451°, Longitude -30 3648=
1�0 000
10 000
a
�*
2-000
3f
� 0100
'J
i 0010
0001
�0 000
10.000
0.100
a
•i
0-001
1 2 5 10 25 50 loo 200 500 1000
Average recurrence interval (years)
1:'UAA At'as 1C, Volume 2, Merron 3 Created [GMT): Fri Aar 23 11.01:16 2017
Back to Too
Pa(Te 2 oF4
Average recurrence
nier.al
(years)
—t
—2
5
10
— 25
50
100
200
500
1000
Duration
— 5-4nrn
— 2 -day
— 10 -mm
— 3 -day
— 15-inm
— »-day
— 30 -min
— 7 -day
— 6G-rnin
— 10 -day
— 2 -hr
— 20 -day
— 3 -hr
N
4 •� —
•� 7
— 7 77
u1 O 1n
O O
"4
c`t �'1 C
c� p
O O
9
Duration
�0 000
10.000
0.100
a
•i
0-001
1 2 5 10 25 50 loo 200 500 1000
Average recurrence interval (years)
1:'UAA At'as 1C, Volume 2, Merron 3 Created [GMT): Fri Aar 23 11.01:16 2017
Back to Too
Pa(Te 2 oF4
Average recurrence
nier.al
(years)
—t
—2
5
10
— 25
50
100
200
500
1000
Duration
— 5-4nrn
— 2 -day
— 10 -mm
— 3 -day
— 15-inm
— »-day
— 30 -min
— 7 -day
— 6G-rnin
— 10 -day
— 2 -hr
— 20 -day
— 3 -hr
— 30 -day
— G -hr
— 45 -day
— 12 -hr
— G"ay
— 23 -hr
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Precipitation Frequency Data Server Page 3 of 4
Maps & aerials
Small scale terrain
nom. x "' y�ta esvil{ ;
Barium r
S
A kmt` _
Large scale terrain
am:
54 -
Large scale map
Ell 0
^Kingsport=
Gieensb'oto-
'�:isli�.iQa�~�"��•_
Our
�
' [H%xFttt,
Carolina
100km
{ _ Oml
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US Department of Commerce
National Oceanic and Atmosphenc Administration
National Weather Smote
National Water Center
1325 cast;Vest Hignway
S.,,,ar Scring MID 20910
CLes;icr; I WSC Questions(o)noaa gov
Disclaimer
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