20090554 Ver 1_More Info Received_20100405

April 1, 2010
NC DWQ 401 /Wetlands Unit
1650 Mail Service Center
Suite 250
Raleigh, NC 27699-1650
EMWLETT
SING &WRUEVING, K
1906 Nash Street North Wilson, NC 27893-1726
Phone: [phone] Fax: [phone]
C)q- D SS 4
11r=@?J
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DENR • WATER QUAl W
1VEX MJS AND STM',VATM tRAWA
REFERENCE: OLDE MILL STREAM, ROCKY MOUNT, NC -NASH CO.
To Whom It May Concern:
Please find herewith, 5 copies of revised plans and supporting documentation for the above referenced project.
Request for more information was addressed as follows:
1. Drainage easements for BMP's added to plans.
2. Maintenance access areas added to plans.
3. Drawdown calculations attached with supplemental information and soils report.
4. Soils report included.
5. Initial fertilizer and watering requirements to be determined with soils analysis and current
conditions at time of construction.
If you have any questions or need additional information, please contact our office. Thank you.
Sincerely,
0 q1f
B,ARTLETT
MUM M & SIMONG, PC
1906 Nash Street North Wilson, NC 27893-1726
Phone: [phone] Fax: [phone]
[e-mail]
March 11, 2010
NCDENR
401 Oversight/Express Review Permitting Unit
1650 Mail Service Center
Raleigh, NC 27604
QGGG?CI?1C??p
APR - 5 201U
DiAM5MRW pj)rn
REFERENCE: OLDE MILL STREAM SOILS EVALUATION-ROCKY MOUNT, NC
INTRODUCTION: A preliminary evaluation of soils and site characteristics was performed
by Jon L. Meade, PhD on September 2, 2009 and March 10, 2010 to evaluate potential
suitability for onsite stormwater control using constructed stormwater wetlands.
STORMWATER WETLAND#1:
The soil series mapped for the location is NrB and include Norfolk, Georgeville, and
Faceville soils. Bore samples tend to match the closest to the Georgeville and Faceville soils
which are generally shown as well drained with moderate permeability and red clay to red
silty clay exceeding 30-40 inches.
METHODS: Two soil sample bore holes (#1 and #2) were performed and locations are
shown in Figure 1 with detailed information in Table 1. Soils are generally sandy clay loam
0"-6" and red clay to a depth of 40"-48" before turning to a more streaky red /brown sandy
clay. Some iron depletions were evident at approximately 36"-40" and the high water table
was estimated to be between 36"40".
CONCLUSIONS AND RECOMMENDATIONS: Based on site contours, the existing
ground elevations for the constructed wetland range between 120.0' to 122.0'. The high clay
content of the soil layers and estimated seasonal high water table of approximately 36"-40"
deep (Elevation approximately 118.0') should be sufficient to support a constructed wetland
with a proposed permanent pool elevation of 118.0'.
STORMWATER WETLAND#2:
The soil series mapped for the location is NrB and include Norfolk, Georgeville, and
Faceville soils. Bore samples tend to match the closest to the Georgeville and Faceville soils
which are generally shown as well drained with moderate permeability and red clay to red
silty clay exceeding 30-40 inches.
-2- March 12, 2010
METHODS: Two soil sample bore holes (#1 and #2) were performed and locations are
shown in Figure 1 with detailed information in Table 1. Soils are generally loamy sand 0"-
10" transitioning to sandy clay at a depth of 24"-30". Faint redox streaks and iron depletions
were evident at approximately 10"-16" and the high water table was estimated to be between
18"-24".
CONCLUSIONS AND RECOMMENDATIONS: Based on site contours, the existing
ground elevations for the constructed wetland range between 124.0' to 125.5'. The high clay
content of the soil layers and estimated seasonal high water table of approximately 18"-24"
deep (Elevation approximately 123.0') should be sufficient to support a constructed wetland
with a proposed permanent pool elevation of 123.0'.
If you have any questions or need additional information, please contact our office. Thank
you.
Sincerely,
Bartlett Engineering & Surveying
CA
Robert S. Bartlett, PE ????,:? ??•?''??;
Enclosure
__ ? SEAL
20106 ?II?
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OLDE MILL STREAM
STORMWATER WETLAND AREA #1
TABLE 1: SOIL PROFILE DESCRIPTIONS
LOCATION: BORE HOLE#1
DEPTH " COLOR TEXTURE DESCRIPTION
0-6 10YR 6/6 SANDY LOAM
6-12 2.5Y 5/4 SANDY LOAM
12-20 5YR 5/8 CLAY
20-26 5YR 5/8 CLAY HEAVY CLAY
10YR 5/4 APPROX. 10%
26-30 5YR 5/8 CLAY HEAVY CLAY
10YR 5/4
2.5Y 6/4
30-36 5YR 5/8 CLAY
2.5Y 4/4
5Y 7/2 IRON DEPLETIONS -30%
36-48 2.5Y 8/2 SANDY CLAY
5YR 5/8
NOTES: HIGH WATER TABLE ESTIMATED TO BE 36"
LOCATION: BORE HOLE#2
DEPTH" COLOR TEXTURE DESCRIPTION
0-6 2.5Y 6/4 SANDY CLAY LOAM
6-16 5YR 5/6 CLAY
2.5Y 6/4 MINOR
16-24 5YR 5/4 CLAY 50%
2.5Y 6/3 50%
24-36 5Y 7/2 CLAY 25%
5YR 5/4 75%
36+ 5Y 7/2 CLAY MAJORITY
5YR 5/4
7.5YR 5/6 STREAKY
NOTES: HIGH WATER TABLE ESTIMATED TO BE 30"-36"
BASED ON EXISTING GROUND CONTOURS, THE SHWT ELEVATION IS APPROXIMATELY AT ELEV. 118.0'
OLDE MILL STREAM
STORMWATER WETLAND AREA #2
TABLE 1: SOIL PROFILE DESCRIPTIONS
LOCATION: BORE HOLE#1
DEPTH " COLOR TEXTURE DESCRIPTION
0-4 10YR 5/4 LOAMY SAND
5-10 10YR 5/4 LOAMY SAND
7.5YR 5/8 FAINT REDOX STREAKS
10-14 2.5Y 4/2 SANDY LOAM
14-18 2.5Y 5/2 SANDY CLAY LOAM
7.5YR 5/8 REDOX STREAKS
18-24 10YR 5/6 SANDY CLAY LOAM
7.5YR 5/8 > 50% REDOX CONCENTRATIONS
24-30 10YR 5/6 SANDY CLAY
7.5YR 5/8
NOTES: HIGH WATER TABLE ESTIMATED TO BE 18"-20"
LOCATION: BORE HOLE#2
DEPTH " COLOR TEXTURE DESCRIPTION
0-4 10YR 4/4 LOAMY SAND
4-8 10YR 5/4 LOAMY SAND
8-12 10YR 5/4 LOAMY SAND
7.5YR 5/8 FAINT REDOX STREAKS
12-16 10YR 5/4 SANDY LOAM
7.5YR 5/8 FAINT REDOX STREAKS
16-20 10YR 6/6 SANDY CLAY LOAM
10YR 7/2 IRON DEPLETIONS
7.5YR 5/8 REDOX STREAKS
20-24 10YR 6/6 SANDY CLAY LOAM
10YR 7/2 MORE PROMINENT IRON DEPLETIONS
7.5YR 5/8 MORE PROMINENT REDOX STREAKS
24-30 10YR 6/6 SANDY CLAY
10YR 7/2 MORE PROMINENT IRON DEPLETIONS
7.5YR 5/8 MORE PROMINENT REDOX STREAKS
NOTES: HIGH WATER TABLE ESTIMATED TO BE 22"-24"
BASED ON EXISTING GROUND CONTOURS, THE SHWT ELEVATION IS APPROXIMATELY AT ELEV. 123.0'
AMW
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
WETLAND SUPPLEMENT
I'?JYJ`A' r
0
This form must be filled out, printed and submitted.
The Required Items Checklist (Part 111) must be printed, filled out and submitted along with all the required information.
i. PROJECT INFORMATION
Project name OLDE MILL STREAM (NASH COUNTY)
Contact name Jon Meade
Phone number 252-399-0704
Date March 12, 2010
Drainage area number 1
11. DESIGN INFORMATION
Site Characteristics
Drainage area 95,530.00 ft
Impervious area 40,999.00 ft
Percent impervious 42.9%%
Design rainfall depth 1.00 inch
Peak Flow Calculations
1-yr, 24-hr rainfall depth
1-yr, 24-hr intensity
Pre-development 1-yr, 24-hr runoff
Post-development 1-yr, 24-hr runoff
Pre/Post 1-yr, 24-hr peak control
Storage Volume: Non-SA Waters
Minimum required volume
Volume provided (temporary pool volume)
Storage Volume: SA Waters Parameters
1.5" runoff volume
Pre-development 1-yr, 24-hr runoff volume
Post-development 1-yr, 24-hr runoff volume
Minimum volume required
Volume provided
Outlet Design
Depth of temporary pool/ponding depth (Dpi,,,,:)
Drawdown time
Diameter of orifice
Coefficient of discharge (CD) used in orifice diameter
calculation
Driving head (Ho) used in the orifice diameter calculation
2.77 in
4.76 in/hr
ft3/sec
ft3/sec
ft3/sec
3,473.00 ft3
3,519.00 ft3 OK
ft3
ft3
ft3
ft3
ft3
12.00 in OK
2.66 days OK
1.00 in OK
0.60 (unitless)
0.34 ft OK
Form SW401-Wetland-Rev.6-11/16/09 Parts I and 11. Project Design Summary, Page 1 of 3
Surface Areas of Wetland Zones
Surface Area of Entire Wetland 4,328.00 ft2 OK
Shallow Land 1,730.00 ftO K
The shallow land percentage is: 40%%
Shallow Water 1,686.00 ft2 OK
The shallow water percentage is: 39%%
Deep Pool
Forebay portion of deep pool (pretreatment) 476.00 ft2 OK
The forebay surface area percentage is: 11%%
Non-forebay portion of deep pool 436.00 ft O K
The non-forebay deep pool surface area percentage is: 10%%
Total of wetland zone areas 4,328.00 ft2 OK
Add or subtract the following area from the zones 0.00 ft2
Topographic Zone Elevations
Temporary Pool Elevation (TPE)
Shallow Land (top) 119.00 ft amsl
Permanent Pool Elevation (PPE)
Shallow Water/Deep Pool (top) 118.00 ft amsl
Shallow Water bottom 117.50 ft amsl
Most shallow point of deep pool's bottom 116.00 ft amsl
Deepest point of deep pool's bottom 116.00 ft amsl
Design must meet one of the following two options:
This design meets Option #1,

Top of PPE is within 6" of SHWT, If yes: Y (Y or N)
SHWT (Seasonally High Water Table) 118.00 ft amsl OK
This design meets Option #2,

Wetland has liner with permeability < 0.01 in/hr, If yes: N (Y or N)
Depth of topsoil above impermeable liner in
Topographic Zone Depths
Temporary Pool
Shallow Land 12.00 in OK
Permanent Pool
Shallow Water 6.00 in OK
Deep Pool (shallowest) 24.00 in OK
Deep Pool (deepest) 24.00 in OK
Planting Plan
Are cattails included in the planting plan? N (Y or N) OK
Number of Plants recommended in Shallow Water Area:
Herbaceous (4'cubic-inch container) 450
Number of Plants recommended in Shallow Land Area:
Herbaceous (4'cubic-inch container), OR 450
Shrubs (1 gallon or larger), OR 72
Trees (3 gallon or larger) and Herbaceous (4+ cubic-inch) 9 and 360
Number of Plants provided in Shallow Water Area:
Herbaceous (4'cubic-inch container) 450 OK
Number of Plants provided in Shallow Land Area:
Herbaceous (4'cubic-inch container) 360 More required if not planting shrubs or trees.
Shrubs (1 gallon or larger)
Trees (3 gallon or larger) and 9 OK
Grass-like Herbaceous (4+ cubic-inch)
Form SW401-Wetland-Rev.6-11/16/09 Parts I and It. Project Design Summary, Page 2 of 3
Additional Information
Can the design volume be contained?
Does project drain to SA waters? If yes,
What is the length of the vegetated filter?
Are calculations for supporting the design volume provided in the
application?
Is BMP sized to handle all runoff from ultimate build-out?
Is the BMP located in a recorded drainage easement with a
recorded access easement to a public Right of Way (ROW)?
The length to width ratio is:
Approximate wetland length
Approximate wetland width
Approximate surface area using length and width provided
Will the wetland be stabilized within 14 days of construction?
Y (Y or N) OK
N (Y or N) Excess volume must pass through filter.
ft
Y (Y or N) OK
Y (Y or N) OK
Y (Y or N) OK
14.38 :1 OK
230.00 ft
16.00 ft
3,680.00 ft2 This approx. surface area is within this number of square feet
of the entire wetland surface area reported above:
Y (Y or N) OK
Form SW401-Wetland-Rev.6-11/16/09 Parts I and II. Project Design Summary, Page 3 of 3
AV-0 ?
NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
WETLAND SUPPLEMENT
o?OF N NA
T?c9OG
y f
o
This form must be filled out, printed and submitted.
The Required Items Checklist (Part 111) must be printed, filled out and submitted along with all the required information.
I. PROJECT INFORMATION
Project name OLDE MILL STREAM (NASH COUNTY)
Contact name Jon Meade
Phone number 252-399-0704
Date March 12, 2010
Drainage area number 2
11. DESIGN INFORMATION
Site Characteristics
Drainage area 280,962.00 ft2
Impervious area 121,328.00 ft2
Percent impervious 43.2%%
Design rainfall depth 1.00 inch
Peak Flow Calculations
1-yr, 24-hr rainfall depth
1-yr, 24-hr intensity
Pre-development 1-yr, 24-hr runoff
Post-development 1-yr, 24-hr runoff
Pre/Post 1-yr, 24-hr peak control
Storage Volume: Non-SA Waters
Minimum required volume
Volume provided (temporary pool volume)
Storage Volume: SA Waters Parameters
1.5" runoff volume
Pre-development 1-yr, 24-hr runoff volume
Post-development 1-yr, 24-hr runoff volume
Minimum volume required
Volume provided
Outlet Design
Depth of temporary pool/ponding depth (Dp1,nJ
Drawdown time
Diameter of orifice
Coefficient of discharge (CD) used in orifice diameter
calculation
Driving head (Ho) used in the orifice diameter calculation
2.77 in
4.76 in/hr
ft3/sec
ft3/sec
ft3/sec
10,270.00 ft3
10,334.00 ft3 OK
ft3
ft3
ft3
ft3
ft3
12.00 in OK
3.47 days OK
1.50 in OK
0.60 (unitless)
0.34 ft OK
Form SW401-Wetland-Rev.6-11/16/09 Parts I and It. Project Design Summary, Page 1 of 3
Surface Areas of Wetland Zones
Surface Area of Entire Wetland
Shallow Land
The shallow land percentage is:
Shallow Water
The shallow water percentage is:
Deep Pool
Forebay portion of deep pool (pretreatment)
The forebay surface area percentage is:
Non-forebay portion of deep pool
The non-forebay deep pool surface area percentage is:
Total of wetland zone areas
Add or subtract the following area from the zones
Topographic Zone Elevations
Temporary Pool Elevation (TPE)
Shallow Land (top)
Permanent Pool Elevation (PPE)
Shallow Water/Deep Pool (top)
Shallow Water bottom
Most shallow point of deep pool's bottom
Deepest point of deep pool's bottom
Design must meet one of the following two options:
This design meets Option #1,
Top of PPE is within 6" of SHWT, If yes:
SHWT (Seasonally High Water Table)
This design meets Option #2,
Wetland has liner with permeability < 0.01 in/hr, If yes:
Depth of topsoil above impermeable liner
Topographic Zone Depths
Temporary Pool
Shallow Land
Permanent Pool
Shallow Water
Deep Pool (shallowest)
Deep Pool (deepest)
Planting Plan
Are cattails included in the planting plan?
Number of Plants recommended in Shallow Water Area:
Herbaceous (4`cubic-inch container)
Number of Plants recommended in Shallow Land Area:
Herbaceous (4'cubic-inch container), OR
Shrubs (1 gallon or larger), OR
Trees (3 gallon or larger) and Herbaceous (4+ cubic-inch)
Number of Plants provided in Shallow Water Area:
Herbaceous (4'cubic-inch container)
Number of Plants provided in Shallow Land Area:
Herbaceous (4'cubic-inch container)
Shrubs (1 gallon or larger)
Trees (3 gallon or larger) and
Grass-like Herbaceous (4+ cubic-inch)
11,696.00 ft2 OK
4,678.00 ft2 OK
40%%
4,716.00 ft2 OK
40%%
1,171.00 ft2 OK
10%%
1,131.00 ft2 OK
10%%
11,696.00 ft2 OK
0.00 ft2
124.00 ft amsl
123.00 ft amsl
122.50 ft amsl
120.00 ft amsl
120.00 ft amsl
Y (Y or N)
123.00 ft amsl OK
N (Y or N)
in
12.00 in OK
6.00 in OK
36.00 in OK
36.00 in OK
N (Y or N) OK
1,200
1,200
192
24 and 960
1,200
101)
OK
OK
Form SW401-Wetland-Rev.6-11/16/09 Parts I and II. Project Design Summary, Page 2 of 3
Additional Information
Can the design volume be contained? Y (Y or N) OK
Does project drain to SA waters? If yes, N _
(Y or N) Excess volume must pass through filter.
What is the length of the vegetated filter? ft
Are calculations for supporting the design volume provided in the Y (Y or N) OK
application?
Is BMP sized to handle all runoff from ultimate build-out? Y (Y or N) OK
Is the BMP located in a recorded drainage easement with a Y (Y or N) OK
recorded access easement to a public Right of Way (ROW)?
The length to width ratio is: 1.87 :1 OK
Approximate wetland length 140.00 ft
Approximate wetland width 75.00 ft
Approximate surface area using length and width provided 10 ,500.00 ftz This approx. surface area is within this number of square feet
of the entire wetland surface area reported above:
Will the wetland be stabilized within 14 days of construction? Y (Y or N) OK
Form SW401-Wetland-Rev.6-11/16/09 Parts I and It. Project Design Summary, Page 3 of 3
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OLD MILL STREAM STORMWATER WETLAND
CALCULATIONS FOR 100YR STORM MAXIMUM WATER SURFACE ELEVATION (MWSEL)
Rational Equation (Q=CIA)
Where: i= 9.35 in/hr (100yr Intensity)
C= 0.62 (2.19 acres total with 0.941 acres impervious)
(open area c=0.4, imp area c=0.9)
A= 2.19 acres
Q= 12.70 cfs
Using the weir formula Q=CwLH1-5 (Weir elev=119.0')
Where: Cw= 3
L= 100 LF
Q= 12.70
Solve for H= 0.12
Assume that stormwater wetland is completely full to weir elevation, the MWSEL=119.12'
BMP#2
Rational Equation (Q=CIA)
Where: i=
C=
A=
Q=
9.35 in/hr (100yr Intensity)
0.62 (6.45 acres total with 2.785 acres impervious)
(open area c=0.4, imp area c=0.9)
6.45 acres
37.39 cfs
Using the weir formula Q=CwLH'.5 (Weir elev=124.0')
Where: Cw= 3
L= 58 LF
Q= 37.39
Solve for H= 0.36
Assume that stormwater wetland is completely full to weir elevation, the MWSEL=124.36'
POINT PRECIPITATION A
FREQUENCY ESTIMATES
FROM NOAA ATLAS 14 V-00) ?.,
ROCKY MOUNT 6 SW, NORTH CAROLINA (31-7395) 35.91 N 77.8892 W 150 feet
from "Precipitation-Frequency Atlas of the United States" NOAA Atlas 14, Volume 2. Version 3
G.M. Bonin, D. Martin, B. Lin, T. Par-zybok, M.Yekta, and D. Riley
NOAA, National Weather Service, Silver Spring, Maryland, 2004
Extracted: Fri Mar 12 2010
Confidence Limits Seasonality Location Maps Other Info. GIS data Maps Docs Return to State Map
Precipitation Intensity Estimates (in/hr)
ARI*

min 10

- 15 30 60 120

hr

hr

2 hr

4 hr

8 hr [2j [L F10 20 30 4

5
F

60
F1

(y )

ears mi
n
mm
mm
min
mm
d

[

d

.
day

1
d?
= 4.76 3.80 3.17 2.17 1.35 0.79 0.55 0.33 0.19 0.12 0.07 0.04 0.03 0.02 0.01 0.01 0.01 0.01
= 5.39 4.30 3.61 2.49 1.56 0.91 0.65 0.39 0.23 0.14 0.08 0.05 0.03 0.02 0.02 0.01 0.01 0.01
0 5.93 4.75 4.00 2.84 1.82 1.08 0.76 0.46 0.27 0.18 0.10 0.06 0.04 0.03 0.02 0.02 0.01 0.01
10 6.92 5.54 4.67 3.38 2.20 1.32 0.94 0.57 0.33 92 0.12 0.07 0.04 0.03 92 0.02 0.01 0.01
25 7.78 6.20 5.24 3.88 2.58 1.58 1.14 0.68 0.41 0.27 0.15 0.08 0.05 0.04 0.03 0.02 0.02 0.01
50 8.63 6.88 5.80 4.37 2.96 1.85 1.35 0.81 0.49 0.32 0.18 0.10 0.06 0.05 0.03 0.02 0.02 0.02
100 9.35 7.43 6.26 4.79 3.30 2.11 1.54 0.94 0.56 0.37 0.21 0.11 0.07 0.05 0.03 0.03 0.02 0.02
200 10.03 7.95 6.69 5.21 3.65 2.38 1.76 1.07 0.65 0.43 0.24 0.12 0.08 0.06 0.04 0.03 0.02 0.02
500 10.78 8.53 7.15 5.69 4.08 2.73 2.04 1.25 0.77 0.52 0.29 0.15 0.09 0.07 0.04 0.03 0.02 0.02
1000 11.63 9.16 7.66 6.20 4.53 3.10 2.35 1.45 0.89 0.60 0.33 0.17 0.10 0.08 0.05 0.03 0.03 0.02
These precipitation frequency estimates are based on a partial duration series. AM is the Average Recurrence interval.
Please refer to NOAA Atlas 14 Document for more information. NOTE: Formatting forces estimates near zero to appear as zero.
* Upper bound of the 90% confidence interval
Precipitation Intensity Estimates (in/hr)
pal-*-*] 5 10 15 30 60 120 3 6 12 24 48 4 7 10 20 30 45 60
(years) min min nun nun min min hr hr hr hr hr day day day 11 day day 11 day 11 day
5.27 4.21 3.50 2.40 1.50 0.88 0.62 0.37 0.21 0.12 0.07 0.04 0.03 0.02 0.01 0.01 0.01 0.01
=2
- 5.90 4.72 3.95 2.73 1.71 1.00 0.71 0.43 0.25 0.15 0.09 0.05 0.03 0.03 0.02 0.01 0.01 0.01
75
] FE] 5.20 4.38 3.11 2.00 1.18 0.84 0.50 0.29 0.19 0.11 0.06 0.04 0.03 0.02 0.02 0.01 0.01
10 7.60 6.07 5.12 3.71 2.42 1.46 1.04 0.62 0.37 0.23 0.13 0.07 0.05 0.04 0.02 0.02 0.02 0.01
25 8.52 6.79 5.74 4.25 2.83 1.74
I
1.25
0.75
0.44
0.29
0.16
0.09
0.06
-1
0.04
-1
0.03
0.02
0.02
0.02
50 9.44 7.52 6.35 4.78 3.24 2.03 1.48 0.89 0.53 0.34 0.19 0.10 0.07 I
0.05
0.03
0.02
0.02
-
0.02
-l
100 10.24 8.13 6.85 5.25 3.61 2.31 1.70 1.03 0.61 0.40 0.22 0.12 0.08 0.06 0.04 0.03 0.02 0.02
200 10.99 8.71 7.33 5.71 4.00 2.60 1.94 1.17 0.71 0.47 0.26 0.14 0.09 0.06 0.04 0.03 0.02 0.02
500 11.83 9.36 7.86 6.25 4.48 2.99 2.25 1.37 0.83 0.57 0.31 0.16 0.10 0.07 0.05 0.03 0.03 0.02
1000 12.82 10.09 8.44 6.84 4.99 3.40 2.60 1.59 0.97 0.66 0.36 0.18 0.11 0.08 0.05 0.04 0.03 0.02
e upper w..- o. ma win-r- imumai ai ii)%connmence ievei is me vawe wnicn t m or the simulated quantile values for a given frequency are greater than.
These precipitation frequency estimates are based on a partial duration series. ARI is the Average Recurrence Interval.
Please refer to NOAA Atlas 14 Document for more information. NOTE: Formatting prevents estimates near zero to appear as zero.
* Lower bound of the 90% confidence interval
Precipitation Intensity Estimates (in/hr)
A46** 5 f-1-6 15 30 60 120 3 6 12 24 48 4 7 10 20 30 45 60
(years) min min min min min min hr ][hr hr hr hr day day day 11 day 11 day 11 day day
4.32 3.45 2.87 1.97 1.23 0.71 0.50 0.30 0.18 0.11 0.06 0.04 0.02 0.02 0.01 0.01 0.01 0.01
0 4.92 3.94 3.30 2.28 1.43 0.83 0.59 0.35 0.21 0.13 0.08 0.04 0.03 0.02 0.02 0.01 0.01 0.01
5.40 4.33 3.65 2.59 1.66 0.98 0.69 0.41 0.24 0.17 0.10 0.05 0.04 0.03 0.02 0.02 0.01 0.01
10 6.31 5.05 4.26 3.08 2.01 1.20 0.85 0.51 0.30 0.20 0.11 0.06 0.04 0.03 0.02 0.02 0.01 0.01
25 7.06 5.62 4.75 3.52 2.34 1.43
1.02 0.62 0.37
0.25
0.14
0.08
0.05
0.04
0.02 0.02
0.02
0.01
50 7.80 6.21 5.24 3.95 2.67 1.66 1.20 0.73 0.44 0.29 0.16 0.09 0.06 0.04 0.03 0.02 0.02 0.02
100 8.39
- 6.67 5.62 4.30 2.96 1.88 1.37 0.83 0.50 0.33 0.18 0.10 0.06 0.05 0.03 0.02 0.02 0.02
F20
01F8 .94 7.09 5.96 4.64 3.25 2.10 1.55 0.94 0.57 0.38 0.21 0.11 0.07 0.05 0.03 0.03 0.02 0.02
500 9.53 7.53 6.32 5.03 3.61 2.39 1.78 1.09 0.66 0.45 0.25 0.13 0.08 0.06 0.04 0.03 0.02 0.02
1000 10.16 8.00 6.70 5.42 3.96 2.68 2.02 1.24 0.76 0.52 0.28 0.14 0.09 0.07 0.04 0.03 0.02 0.02
' The lower bound of th e confiden ce interva l at 90% confidence level is th e value w hich 5% o f tha slm. W d mrn oeln ?A. - f-. „i - r..,.,,. .,,.,, ... r. .. a...
these precipitation frequency estimates are based on a partial duration maxima series ARI is the Average Recurrence Interval,
http:llhdsc.nws.noaa.gov/cgi-binlhdsclbuildout.perl?type=idf&units=us&series=pd&staten... 3/12/2010
Please refer to NOAA Atlas 14 Document for more information. NOTE: Formatting prevents estimates near zero to appear as zero.
Text version of tables
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Partial duration based Point IDF Curves - Version: 3
35.91 h 77.8892 W 150 ft
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E E E E
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Fri Mar 12 13:52:17 2010
Maps -
Average Recurrence Interval
(years)
I--fear
2-year 100-year -
5-year + '. c,s, -" '- --
10-year 500-year +
25-year -- 1000-year $
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70"W
These maps were produced using a direct map request from the
U.S. Census Bureau Mapping and Cartographic Resources
Tiger Mao Server.
Please read disclaimer jar more injormaNon.
http://hdsc.nws.noaa.gov/cgi-binlhdscibuildout.perl?type=idf&units=us&series=pd&staten... 3/12/2010
i 1
170"'W 110'"W 100"Id 90" W 80"Id
LEGEND
- State - Connector
- County Stream
= Indian Resv 11 . Military Area
111111110 LakelPondlOcean 1W. National Park
- Street - Other Park
- Expressway [-]City
- Highway 0 f- C$unty,6 .8 Mi
Scale 1:228583 2 11
*average--true scale depends on ..n6t.r'reso" ution
Other Maps/Photographs -
View USGS dieital orthouhoto auadranele (DOO) covering this location from TerraServer; USGS Aerial Photograph may also be available
from this site. A DOQ is a computer-generated image of an aerial photograph in which image displacement caused by terrain relief and camera
tilts has been removed. It combines the image characteristics of a photograph with the geometric qualities of a map. Visit the USGS for more information.
Watershed/Stream Flow Information -
Find the Watershed for this location using the U.S. Environmental Protection Agency's site.
Climate Data Sources -
Precipitation frequency results are based on data from a variety of sources, but largely NCDC. The following links provide general information
about observing sites in the area, regardless of if their data was used in this study. For detailed information about the stations used in this study,
please refer to NOAH Atlas 14 Document.
Using the National Climatic Data Center's (NCDC) station search engine, locate other climate stations within:
+/-30 minutes OR +/-1 degree of this location (35.91/-77.8892). Digital ASCII data can be obtained directly from NCDC
Hydrometeorological Design Studies Center
DOC/NOAA/National Weather Service
1325 East-West Highway
Silver Spring, MD 20910
[phone]
Questions?: HDSC Ouestions(anoaa.eov
Disclaimer
http://hdsc.nws.noaa.gov/cgi-binlhdsclbuildout.perl?type=idf&units=us&series=pd&staten... 3/12/2010