SW1170501_Stormwater Report_20221223

BROoKsw' Planning & Project Management / Civil Engineering / Surveying
Sail Science Services / Environmental Engineering & Services
EN G I N EERT N G AS S O C I AT E S 17 Arlington Street 1 Asheville NC28801 1 www.hrooksea.co® / 828-232-4700
AcoNy ®ELL m PH 3
MILLS RIVER' HEM®ERS®M COUNTY, NORTH CAR®LIMA
ERQSI13N AND SE®1MEN7-ATION C®NTR0L REVISI®N:
NARRA-ri E AND CALCULA-rmNE
PREPARED FOR:
AGONY BELL OF WNC, LLC
17 ARLINBTON ST
ASHEVILLE, NC 2138C11
�Ia
_ f'EL
051824
/IIIj1111144441111
PREPARED BY:
ER[C J. HUTCHISON III, PE
BROOKS ENGINEERINr. ASSOCIATES, PA
1 7 ARLINGTON ST - ASHEVILLE, N C 2BB0 1
ORIGINAL: SEPTEMBER 109 2021
REVISED: NOVEMBER IS, 2021

TABLE OF CONTENTS
Project Narrative and Methodology.................................................................. 1.0
Current Property References — Deed, Plat, Stormwater Permit ................................... Appendix A
NOAA Precipitation Charts, USGS Quad, FEMA Flood and NRCS Maps .................... Appendix B
Stormwater Conveyance and ESC Calculation Maps and Tables .............................. Appendix C

1.0 PROJECT NARRATIVE
1.1 Summary & Design Parameters
The included calculations and associated engineering plans are provided as a new phase of previously
closed out permit HENDE 2018-001 in order to demonstrate compliance of the project activities with the
NCDEQ Erosion and Sedimentation Control requirements for land disturbance. The 50.5ac subject
property is to undergo a third phase of development, involving development of 19 slips (bringing the site
total to 96) in two locations (these previously approved units were relocated from PHI and PH2 areas in
order to achieve lower density in those areas) and requiring land disturbance of approximately 5.0 acres.
To ensure that these operations are compliant with current NCDEQ standards as well as state
requirements for low -density development, measures will be provided which aid in sediment trapping,
surface stabilization, stormwater conveyance, and stormwater discharge/outlet stabilization. In addition to
outlining the construction and implementation of these measures, this report will also outline the required
site reporting and notifications through the duration of the project.
1.2 Project Contacts
Project Engineer: Eric J. Hutchison III, PE - Brooks Engineering Associates [phone]
Owner and Developer Emergency Contact: Mark Brooks - Acony Bell of WNC [phone]
NCDEQ — Asheville Office Regional Engineer: Stanley Aiken, PE [phone]
1.3 Existing Conditions
The subject site is located at 10517 Boylston Hwy (NC-280), Henderson County, PIN 9519-54-0173 (see
Appendix A for current property references).
Runoff from both of the project areas generally drains overland from north to south towards Goldmine
Branch (C, 6-52-5) and Boylston Creek (C, 6-52-(0.5)).
1.3 Proposed Disturbance
Land disturbance will be performed in 2 phases. The first phase will provide sediment loss protection
during Clearing and Grubbing operations through installation of perimeter measures including stabilized
construction entrances to protect against vehicle tracking of sediment onto public roads, silt fence with
reinforced stabilized outlets for water filtration and sediment capture, and sediment basins with associated

temporary and permanent diversions to provide capture of runoff and allow for discrete particle settlement
prior to discharge. Channels and side slopes of basins will be seeded and stabilized as they are
constructed. The second phase covers the period where Grading and Final Stabilization activities will take
place on the site to allow for construction of access roads and unit slips. This phase includes maintenance
of the existing Phase 1 measures, construction of slopes as they are brought to final grade and stabilized
with matting and vegetation, and installation of the permanent stormwater conveyance devices with
appropriate inlet and outlet protection devices. In accordance with NCDEQ standards, all erosion control
measures are designed for the 10-year storm event at a minimum — as an additional conservative measure,
all conveyances and discharge aprons are sized for the 25-year event at a minimum.
1.3 Post -Development Conditions
The proposed development will involve approximately 1.Oac of new BUA at full buildout, consisting of
buildings, paved roads, and gravel parking. Runoff will be safely conveyed through the developed areas
with stabilized conveyance channels and cross -pipes at road crossings. All discharge points will be
provided with riprap outlet protection sized for the 25-year event.

Appendix "A"

BOOK 3077 PAGE 656 (2)
666578 11111111111111
This document presented and filed:
07/13/2017 03:39:39 PM
"/6-<
WILLIAM LEE KING, Henderson COUNTY, NC
Transfer Tax: $1.198.00
NORTH CAROLINA GENERAL WARRANTY DEED
Excise Tax: $1.198.00
Parcel Identifier No. 800090
Mail/Box to: Goosmann, Rose, Colvard & Cramer, PA
This instrument was prepared by: Wm. Michael Begley, Begley Law Firm, PA, a licensed North Carolina
attorney. Delinquent taxes, if any, to be paid by the closing attorney to the county tax collector upon
disbursement of closing proceeds.
Brief description for the Index:
THIS DEED made this 13th day of July, 2017, by and between
GRANTOR GRANTEE
James Eade Anderson, Trustee under Acony Bell of WNC, LLC, a North Carolina
Declaration of Trust dated December 28, limited liability company
1976. executed by James E. Anderson, 17 Arlington Street
Grantor and Trustee, as amended Asheville, NC 28801
P. O. Box 489 rn I►�
Montreat, NC 28757
The designation Grantor and Grantee as used herein shall include said parties, their heirs, successors, and
assigns, and shall include singular, plural, masculine, feminine or neuter as required by context.
WITNESSETH, that the Grantor, for a valuable consideration paid by the Grantee, the receipt of which is
hereby acknowledged, has and by these presents does grant, bargain, sell and convey unto the Grantee in fee
simple, all that certain lot or parcel of land situated in Mills River Township, Henderson County, North
Carolina and more particularly described as follows:
Being all of that tract of land containing 53.432 acres, more or less, as shown on a Plat entitled "Survey For:
BMP Holdings, LLC", which said Plat is duly recorded in the Office of the Register of Deeds for Henderson
County, North Carolina in Plat Slide 10756, reference to which said Plat is hereby made for a more particular
metes and bounds description of said tract of land.

Book 3077
Page 657
The property hereinabove described was acquired by Grantor by instrument recorded in Book 549, page 193.
All or a portion of the property herein conveyed _ includes or _X_ does not include the primary residence
of a Grantor.
A map showing the above described property is recorded in Plat Slide 10756.
TO HAVE AND TO HOLD the aforesaid lot or parcel of land and all privileges and appurtenances thereto
belonging to the Grantee in fee simple.
And the Grantor covenants with the Grantee, that Grantor is seized of the premises in fee simple, has the
right to convey the same in fee simple, that title is marketable and free and clear of all encumbrances, and
that Grantorwill warrant and defend the title against the lawful claims of all persons whomsoever, other than
the following exceptions: Easements, restrictions, rights of way of record, and 2017 ad valorem taxes,
prorated as of the date of closing. The Grantor further warrants that restrictions, if any, have not been
materially violated and do not affect the value of the subject property, that any labor or material furnished
to the subject property within 120 days prior to the date of this Deed have been paid, and that, upon delivery
of this Deed, no tenant or any person other than the Grantee herein will have any right to use or possess the
subject property.
IN WITNESS WHEREOF, the Grantor has duly executed the foregoing as of the day and year first above
written.
"q � - 14 15!w-.- (SEAL)
-es Eade Anderson, Trustee under f5eclaration of
Trust dated December 28, 1976, executed by
James Eade Anderson, Grantor, as amended
State of North Carolina - County of Buncombe
I, the undersigned Notary Public of the County and State aforesaid, certify that James Eade Anderson,
Trustee under Declaration of Trust dated December 28, 1976, executed by James E. Anderson, Grantor, as
amended, who is known to me or proved to me on the basis of satisfactory evidence to be the person
described, personally appeared before me this day and acknowledged the due execution of the foregoing
instrument for the purposes therein expressed. Witness my hand and Notarial stamp or seal this 13th day of
July, 2017.
Notary Public
CU
G • : 2 My Commission Expires: February 29, 2020
C ',

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BK 2021 PG 13497 - 13497 (1) DOC# 950252
This Document eRecorded: 07/16/2021 09:27:46 AM
Fee: $21.00
Henderson County, North Carolina
William Lee King, Register of Deeds

State Stormwater Permit
Permit No.SW1170501
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT QUALITY
STATE STORMWATER MANAGEMENT PERMIT
In accordance with the provisions of Article 21 of Chapter 143, General Statutes of
North Carolina as amended, and other applicable Laws, Rules and Regulations
PERMISSION IS HEREBY GRANTED TO
BME Holdings
FOR THE
construction, operation and maintenance of a low density development, Acony Bell, Mills
River, Henderson County in compliance with the provisions of 15A NCAC 2H .1017 (hereafter
referred to as the "stormwater rules') and the approved stormwater management plans
and specifications, and other supporting data as attached and on file with and approved
by the State and considered a part of this permit.
The Permit shall be effective from the date of issuance until rescinded and shall be
subject to the following specific conditions and limitations:
I. DESIGN STANDARDS
The overall tract built -upon area percentage for the project must be maintained
below 24% or 2 dwelling units per acre, as required by 15A NCAC 2H .1017 of
the stormwater rules.
2. Approved plans and specifications for projects covered by this permit are
incorporated by reference and are enforceable parts of the permit.
3. All roof drains must terminate at least 30 foot from the mean high water mark.
4. The built -upon areas associated with this project shall be located at least 30 feet
landward of all perennial and intermittent streams.
5. Projects shall be designed to maximize dispersed flow through vegetated areas
and minimize channelization of flow.
6. Stormwater that cannot be released as dispersed flow shall be transported by
vegetated conveyances. A minimal amount of non -vegetated conveyances for
erosion protection or piping for driveways or culverts under a road shall be
allowed by the permitting authority when it cannot be avoided.
7. The conveyance shall be designed so that it does not erode during the peak flow
from the 10-year storm as demonstrated by engineering calculations.
8. Grassed swales or vegetated areas shall be designed such that the swale or
vegetated area can carry the peak flow from the 10-year storm at a non -erosive
Page 1 of 4

State Stormwater Permit
Permit No.SW1170501
velocity. The longitudinal slope of the swale or vegetated area shall not exceed
five percent, except where not practical due to physical constraints. In these
cases, devices to slow the rate of runoff and encourage infiltration to reduce
pollutant delivery shall be provided. The swale's cross-section shall be
trapezoidal with a minimum bottom width of two feet. The side slopes of the
swale or vegetated area shall be no steeper than 3:1 (horizontal to vertical).
9. The minimum length of the swale or vegetated area shall be 100 feet.
II. SCHEDULE OF COMPLIANCE
The permittee is responsible for verifying that the proposed built -upon area does
not exceed the allowable built -upon area.
2. The Director may notify the permittee when the permitted site does not meet one
or more of the minimum requirements of the permit. Within the time frame
specified in the notice, the permittee shall submit a written time schedule to the
Director for modifying the site to meet minimum requirements. The permittee
shall provide copies of revised plans and certification in writing to the Director
that the changes have been made.
3. This project may not be sold or subdivided in whole or in part without first
receiving a permit modification.
4. The following deed restrictions must be recorded with the Office of the Register
of Deeds:
a. The following covenants are intended to ensure ongoing compliance with
State Stormwater Management Permit Number SW1170501.
b. The State of North Carolina is made a beneficiary of these covenants to
the extent necessary to maintain compliance with the Stormwater
Management Permit.
C. These covenants are to run with the land and be binding on all persons
and parties claiming under them.
d. The covenants pertaining to stormwater may not be altered or rescinded
without the express written consent of the State.
e. Alteration of the drainage as shown on the approved plans may not take
place without the concurrence of the State.
f. This project may not be sold or subdivided, in whole or in part, without first
receiving a permit modification from the Division.
h. Construction of additional impervious areas such that low -density
requirements are no longer met will require a permit modification prior to
construction. An engineered system will be required to collect and treat
the runoff from all built -upon area associated with the project, including
that area permitted under the low -density option.
i. Filling in or piping of any vegetative conveyances (ditches, swales, etc.)
associated with this development, except for average driveway crossings,
is strictly prohibited by any persons.
j. The built -upon areas shall be located a minimum of 30 feet landward of all
perennial and intermittent surface waters.
Page 2 of 4

State Stormwater Permit
Permit No.SW1170501
5. A copy of the recorded restrictions must be received in this Office within 30 days
of the date of sale.
6. Filling in or piping of any vegetative conveyances (ditches, swales, etc.)
associated with the permitted development, except for average driveway
crossings, is strictly prohibited by any persons.
7. The permittee shall submit to the Director and shall have received approval for
revised plans, specifications, and calculations prior to construction, for any
modification to the approved plans, including, but not limited to, those listed
below:
a. Any revision to the approved plans, regardless of size.
b. Project name change.
C. Transfer of ownership.
d. Redesign or addition to the approved amount of built -upon area.
e. Further subdivision, acquisition, or sale of the project area in whole or in
part. The project area is defined as all property owned by the permittee,
for which Sedimentation and Erosion Control Plan approval was sought.
f. Filling in, altering or piping any vegetative conveyance shown on the
approved plan.
8. During construction, erosion shall be kept to a minimum and any eroded areas of
the swales or other vegetated conveyances will be repaired immediately.
9. At all times the permittee shall provide the operation and maintenance necessary
to operate the permitted stormwater management systems at optimum efficiency
to include:
a. Inspections
b. Sediment removal.
C. Mowing, and re -vegetating of the side slopes.
d. Immediate repair of eroded areas.
e. Maintenance of side slopes in accordance with approved plans and
specifications.
10. Within 30 days of completion of the project, the permittee shall certify in writing
that the project has been constructed in accordance with the approved plans.
11. The permittee shall submit all information requested by the Director or his
representative within the time frame specified in the written information request.
III. GENERAL CONDITIONS
This permit is not transferable to any person or entity except after notice to and
approval by the Director. The Director may require modification or revocation and
re -issuance of the permit to change the name and incorporate such other
requirements as may be necessary. In the event of a name or ownership
change, a completed Name/Ownership Change form, signed by both parties,
must be submitted to the State accompanied by the supporting documentation.
The approval of this request will be considered on its merits.
Page 3 of 4

State Stormwater Permit
Permit No.SW1170501
2. The permittee is responsible for compliance with all permit conditions until the
Director approves a transfer of ownership. Neither the sale of the project nor the
transfer of common areas to a third party, such as a homeowner's association,
constitutes an approved transfer of the stormwater permit.
3. Failure to abide by the conditions and limitations contained in this permit may
subject the Permittee to an enforcement action in accordance with North
Carolina General Statutes 143-215.6A to 143-215.6C.
4. The issuance of this permit does not prohibit the Director from reopening and
modifying the permit, revoking and reissuing the permit, or terminating the permit
as allowed by the laws, rules, and regulations contained in Session Law 2006-
246, Title 15A of the North Carolina Administrative Code, Subchapter 2H.1000-1
and North Carolina General Statute 143-215.1 et. al.
5. In the event the facilities fail to perform satisfactorily, including the creation of
nuisance conditions, the Permittee shall take immediate corrective action,
including those as may be required by the State, such as the construction of
additional or replacement stormwater management systems.
6. The permittee grants permission to DEQ Staff to enter the property during
normal business hours, to inspect all components of the stormwater
management facility.
7. The permit issued shall continue in force and effect until revoked or terminated.
The permit may be modified, revoked and reissued or terminated for cause. The
filing of a request for a permit modification, revocation and re -issuance, or
termination does not stay any permit condition.
8. Unless specified elsewhere, permanent seeding requirements for the swales
must follow the guidelines established in the North Carolina Erosion and
Sediment Control Planning and Design Manual.
9. Approved plans and specifications for this project are incorporated by reference
and are enforceable parts of the permit.
10. The issuance of this permit does not preclude the Permittee from complying with
all statutes, rules, regulations, or ordinances, which may be imposed by other
government agencies (local, state and federal), which have jurisdiction.
11. The permittee shall notify the Division in writing of any name, ownership or
mailing address changes at least 30 days prior to making such changes.
Permit issued this the 23rd day of May, 2017.
0r4�+�s4ne& try M F. R",daW
for Tracy E. Davis, P.E., CPM
Director Division of Energy, Mineral, and Land Resources
Page 4 of 4

Appendix `B"

8/20/2021 Precipitation Frequency Data Server
NOAA Atlas 14, Volume 2, Version 3
(D Location name: Mills River, North Carolina, USA* '°
Latitude: 35.3293°, Longitude:-82.6391°
Elevation: ft**
° source: ESRI SRI Maps
** source: USGS
POINT PRECIPITATION FREQUENCY ESTIMATES
G.M. Bonnin, D. Martin, B. Lin, T. Parzybok, 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)1
Duration
Average recurrence interval (years)
1
���������
2
5
10
25
50
100
200
500
1000
0.383
0.456
0.545
0.613
0.701
0.767
0.834
0.901
0.989
1.06
5-min
(0.347-0.425)
(0.413-0.505)
(0.492-0.603)
(0.551-0.676)
(0.626-0.773)
(0.682-0.847)
(0.738-0.923)
(0.792-1.00)
(0.858-1.10)
(0.910-1.19)
10-min
0.554-0 678
0.661-0 808
0.788-0 966
0. 82-$1 A8
0.998-1.23
1.09-21.35
1.17-31347
1.25-41.59
1.36---1.75
1.43-6L87
0.765
0.917
1.10
1.24
1.42
1.55
1.68
1.80
1.97
2.09
15-min
(0.692-0.848)
(0.830-1.02)
(0.997-1.22)
1 (1.12-1.37)
1 (1.26-1.56)
1 (1.38-1.71)
1 (1.48-1.86)
(1.58-2.00)
(1.71-2.20)
(1.80-2.35)
1.05
1.27
1.57
1.80
2.10
2.33
2.57
2.81
3.13
3.39
30-min
(0.949-1.16)
1 (1.15-1.40)
1 (1.42-1.74)
1 (1.62-1.98)
1 (1.87-2.31)
1 (2.07-2.57)
1 (2.27-2.84)
(2.47-3.12)
(2.72-3.50)
(2.91-3.81)
1.31
1.59
2.01
2.34
2.79
3.16
3.54
3.94
4.49
4.95
60-min
(1.18-1.45)
(1.44-1.76)
(1.82-2.23)
(2.10-2.58)
(2.50-3.08)
(2.81-3.49)
1 (3.13-3.91)
(3.46-4.37)
(3.90-5.02)
(4.25-5.56)
1.55
1.88
2.37
2.76
3.30
3.75
4.22
4.72
5.43
6.02
2-hr
(1.40-1.71)
(1.70-2.07)
(2.14-2.61)
(2.48-3.03)
(2.95-3.63)
(3.33-4.13)
(3.72-4.66)
(4.13-5.22)
(4.69-6.04)
(5.15-6.73)
61988
3-hr
6
-
6.87
1.53-
1. 5-02426
2.31 2583
2. 89.29
3.21 3998
3.64 4.55
4. 96.17
4.57 585
5. 5
5.81-87?73
2.25
2.70
3.33
3.86
4.64
5.31
6.04
6.84
8.03
9.05
6-hr
(2.06-2.48)
(2.47-2.97)
(3.03-3.66)
(3.51-4.25)
(4.18-5.11)
(4.74-5.85)
(5.33-6.67)
(5.97-7.58)
(6.88-8.94)
(7.65-10.1)
2.91
3.49
4.29
4.93
5.83
6.58
7.35
8.19
9.38
10.4
12-hr
(2.67-3.18)
(3.20-3.82)
(3.93-4.69)
(4.50-5.39)
(5.30-6.38)
(5.94-7.20)
(6.59-8.07)
(7.28-9.02)
(8.23-10.4)
(9.00-11.6)
24-hr
$
3. 0 3?87
3.96 4863
4.87 5670
5.58 6453
6. 5 7?69
7.33 8064
8. 9162
8.94- 0.7
10.1- 12.1
10.9-13.4
4.27
5.09
6.20
7.08
8.30
9.29
10.3
11.4
12.9
14.0
2-day
(3.98-4.60)
(4.74-5.50)
(5.77-6.68)
(6.58-7.63)
(7.68-8.94)
(8.56-10.00)
1 (9.46-11.1)
(10.4-12.3)
(11.6-13.9)
(12.6-15.3)
4.56
5.43
6.56
7.45
8.66
9.63
10.6
11.6
13.0
14.2
3-day
(4.26-4.89)
(5.07-5.83)
(6.11-7.03)
(6.93-7.98)
(8.04-9.28)
1 (8.91-10.3)
1 (9.79-11.4)
(10.7-12.5)
(11.9-14.1)
(12.8-15.3)
0 9
9
4-day
01
4.548518
5. 0 6?16
6. 6--7.37
7.298.33
8.39 9?62
9. 5--10.6
10 7
11 7
121314.2
13.10-15.4
5.70
6.77
8.10
9.17
10.6
11.8
13.0
14.2
15.8
17.2
7-day
(5.33-6.12)
(6.33-7.26)
(7.58-8.69)
(8.55-9.83)
(9.88-11.4)
1 (10.9-12.6)
1 (12.0-13.9)
(13.0-15.2)
(14.4-17.0)
(15.5-18.5)
6.56
7.76
9.20
10.3
11.9
13.1
14.4
15.7
17.4
18.7
10-day
(6.17-6.99)
(7.29-8.28)
(8.64-9.81)
(9.70-11.0)
(11.1-12.7)
1 (12.2-14.0)
1 (13.4-15.3)
(14.5-16.7)
(15.9-18.6)
(17.1-20.1)
8.8
20-day
7.3
8. 0 9839
9.89- 1.0
11.5-12.8
12.17- 4.2
14.13-16.0
15 4-
16.16-18.6
17.17---19.9
19 0- 1.7
20.1-263.0
10.8
12.7
14.6
15.9
17.7
19.0
20.2
21.3
22.8
23.8
30-day
(10.3-11.4)
(12.1-13.4)
(13.8-15.4)
(15.1-16.8)
(16.7-18.7)
(17.9-20.0)
1 (19.0-21.3)
(20.0-22.6)
(21.3-24.1)
(22.2-25.3)
13.8
16.1
18.2
19.7
21.5
22.7
23.9
25.0
26.2
27.1
45-day
(131 14.5)
(15.3-16.9)
(17.3-19.1)
(18.7-20.6)
(20.4-22.5)
(21.6-23.9)
1 (22.6-25.1)
(23.6-26.3)
(24.7-27.6)
(25.5-28.6)
3.1
6.3
60-day
$
151615 3
18.19 0.1
2 5� 2.5
220- 4.2
23?8-26.2
25?0-27.6
26?� 8.9
27?$ 0.1
28 39 .4
29 0032.4
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
PF graphical
https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=35.3293&Ion=-82.6391 &data=depth&units=english&series=pds 1 /4

8/20/2021 Precipitation Frequency Data Server
PDS-based depth -duration -frequency {DDF) curves
Latitude: 35.32931, Longitude:-82.63911
35
30
25
5
0
tp
fp tp
fp t9
N
N
N f9
Ln
O
LA
4
r-� O
O
O
u1 O
'i
'•I
rn
kc
'i
N
M
-7 4D
Duration
35
30
25
s
+L
a.
20
0
15
M
2 10
rL
5
0
1 2 5 10 25 50 100 200 500 1000
Average recurrence interval (years)
P40AA Atlas 14, Volume 2, Version 3 Created (GMTY Fri Aug 20 16:54:32 2021
Back to Too
Maps & aerials
Small scale terrain
Average recurrence
mrerval
{years}
— t
2
10
25
50
100
200
500
1000
Duration
5-mm
-- 2Aay
— 10-min
— 3-day
15-min
— 4Aay
— 30-min
-- 7-day
— 60-min
— 10-day
— 2-hr
— 20-day
-- 3fir
— 30-day
— 6-hr
— 45-day
— 12-hr
— 60-day
24-hr
https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=35.3293&Ion=-82.6391 &data=depth&units=english&series=pds 2/4

8/20/2021 Precipitation Frequency Data Server
Af 0 U N TA IN
Holly Springs'
ECl
]�Zi)RGE ORR
N
3km .
2mi
jy
Large scale terrain
Kinq�.poit* Bristol
.6
J I) III s011 City 41
Win Stoll -Sal -
Knoxville
FAI fvlit,711a1
ALSIIeVill-E N 0 R T H
Char
110 09C4
4P Greenville +
100km S C1 U T H R C
60mi
-Amens
Large scale map
Kingsport - map
Johnson City
Large scale aerial
https:llhdsc.nws.noaa.gov/hdsc/pfds/pfds-Printpage.html?lat=35.3293&lon=-82.639l &data=depth&units=english&series=pds 3/4

8/20/2021
Precipitation Frequency Data Server
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.Questionsft_noaa.gov
Disclaimer
https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=35.3293&Ion=-82.6391 &data=depth&units=english&series=pds 4/4

8/20/2021 Precipitation Frequency Data Server
NOAA Atlas 14, Volume 2, Version 3
(D Location name: Mills River, North Carolina, USA* '°
Latitude: 35.3293°, Longitude:-82.6391°
Elevation: ft**
° source: ESRI SRI Maps
** source: USGS
POINT PRECIPITATION FREQUENCY ESTIMATES
G.M. Bonnin, D. Martin, B. Lin, T Parzybok, 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
Average
recurrence interval (years)
1
2
5
10
25
50
100
200
500
1000
4.60
5.47
6.54
7.36
8.41
9.20
10.0
10.8
11.9
12.7
5-min
(4.1 6-5.10)
1 (4.96-6.06)
(5.90-7.24)
1 (6.61-8.11)
1 (7.51-9.28)
(8.18-10.2)
1 (8.86-11.1)
1 (9.50-12.0)
(10.3-13.2)
(10.9-14.3)
10-min
5
3.32 4?07
3.97 4?85
4.73 5380
5. 9 6849
5.99 7039
6.52 8309
7.04 8680
7.b3 9?52
8. -310.5
8.60-111.2
3.06
3.67
4.41
4.96
5.66
6.18
6.70
7.21
7.87
8.38
15-min
(2.77-3.39)
1 (3.32-4.06)
1 (3.99-4.89)
1 (4.46-5.47)
1 (5.06-625)
1 (5.50-6.83)
1 (5.93-7.42)
1 (6.33-8.00)
1 (6.84-8.79)
1 (7.20-9.40)
2.10
2.53
3.14
3.59
4.19
4.66
5.13
5.61
6.26
6.78
30-min
(1.90-2.32)
(2.29-2.81)
(2.83-3.47)
(3.23-3.97)
(3.754.63)
(4.14-5.15)
(4.54-5.68)
(4.93-6.23)
(5.44-6.99)
(5.83-7.61)
1.31
1.59
2.01
2.34
2.79
3.16
3.54
3.94
4.49
4.95
60-min
(1.1 8-1.45)
(1.44-1.76)
(1.82-2.23)
(2.10-2.58)
(2.50-3.08)
(2.81-3.49)
(3.13-3.91)
(3.46-4.37)
(3.90-5.02)
(4.25-5.56)
0.773
0.939
1.18
1.38
1.65
1.87
2.11
2.36
2.72
3.01
2-hr
(0.701-0.854)
(0.852-1.03)
1 (1.07-1.30)
1 (1.24-1.52)
1 (1.48-1.82)
1 (1.67-2.07)
(1.86-2.33)
(2.07-2.61)
(2.35-3.02)
(2.57-3.36)
3-hr
0.510-0 625
0.615-0..753
0.768-0 942
0.999110
1.072 .32
1.213752
1.365572
1.521595
1. 5-02429
1.94 2957
0.376
0.451
0.556
0.645
0.776
0.887
1.01
1.14
1.34
1.51
6-hr
(0.344-0.414)
(0.412-0.496)
(0.507-0.612)
(0.585-0.709)
(0.698-0.853)
(0.792-0.977)
(0.890-1.11)
(0.997-1.27)
1 (1.15-1.49)
1 (1.28-1.69)
0.242
0.290
0.356
0.409
0.484
0.546
0.610
0.680
0.778
0.861
12-hr
(0.222-0.264)
(0.266-0.317)
(0.326-0.389)
(0.374-0.447)
(0.439-0.530)
(0.493-0.598)
(0.547-0.670)
(0.604-0.749)
(0.683-0.864)
(0.747-0.962)
24-hr
0.13.1161
8-0.
0.165-0.193
0.203-0..237
0.232-0.272
0.2073-0 321
0.305-0 360
0.338-0 401
0.377 -0 444
0.419-0 506
0.45 6-0 556
0.089
0.106
0.129
0.148
0.173
0.193
0.215
0.237
0.268
0.293
2-day
(0.083-0.096)
(0.099-0.114)
(0.120-0.139)
(0.137-0.159)
(0.160-0.186)
(0.178-0.208)
(0.197-0.231)
(0.216-0.256)
(0.242-0.290)
(0.263-0.318)
0.063
0.075
0.091
0.103
0.120
0.134
0.147
0.162
0.181
0.197
3-day
(0.059-0.068)
(0.070-0.081)
(0.085-0.098)
(0.096-0.111)
(0.112-0.129)
(0.124-0.143)
(0.136-0.158)
(0.148-0.174)
(0.165-0.195)
(0.178-0.213)
4-day
0.047--0 054
0.056-0 064
0. 67--0 077
0.076-0 087
0. 87--0.100
0. 9.6-011
0.105-0.122
0.114-0..1133
0.126 O$ 48
161
0.135-0.9
0.034
0.040
0.048
0.055
0.063
0.070
0.077
0.084
0.094
0.102
7-day
(0.032-0.036)
(0.038-0.043)
(0.045-0.052)
(0.051-0.059)
(0.059-0.068)
(0.065-0.075)
(0.071-0.083)
(0.078-0.091)
(0.086-0.101)
1 (0.092-0.110)
0.027
0.032
0.038
0.043
0.050
0.055
0.060
0.065
0.072
0.078
10-day
(0.026-0.029)
(0.030-0.034)
(0.036-0.041)
(0.040-0.046)
(0.046-0.053)
(0.051-0.058)
(0.056-0.064)
(0.060-0.070)
(0.066-0.078)
(0.071-0.084)
20-day
0.018-0 020
0.021-0 023
0.02 -0 027
0.026-0 030
0.030-0 033
0.032--0 036
0.03 -0 039
0.037--0 042
0.040-0 045
0.042--0 048
0.015
0.018
0.020
0.022
0.025
0.026
0.028
0.030
0.032
0.033
30-day
(0.014-0.016)
(0.017-0.019)
(0.019-0.021)
(0.021-0.023)
(0.023-0.026)
(0.025-0.028)
(0.026-0.030)
(0.028-0.031)
(0.030-0.034)
(0.031-0.035)
0.013
0.015
0.017
0.018
0.020
0.021
0.022
0.023
0.024
0.025
45-day
(0.012-0.013)
(0.014-0.016)
(0.016-0.018)
(0.017-0.019)
(0.019-0.021)
(0.020-0.022)
(0.021-0.023)
(0.022-0.024)
(0.023-0.026)
(0.024-0.026)
30
40
50
17
60-day
0.01100 012
0.01 014
001 016
001 017
00170-0 018
00170-0 019
0.018--0 020
0.019--0 021
0.020--0 022
0.020--0 023
1 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 (fora
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
PF graphical
https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=35.3293&Ion=-82.6391 &data=intensity&units=english&series=pds 1 /4

8/20/2021 Precipitation Frequency Data Server
PDS-based intensity -duration -frequency (IDF) curves
Latitude: 35.32931, Longitude:-32.63911
100.00
001
M
-U
ro M
ru r0
-0-U
M
-U-0-V-U
M
M r9
A A
6
A
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^
N N
A 4
r-� O
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-7 4O
Duration
I [MIIN61*I
001 r` I I I I I I I -L
I
1 2 5 10 25 50 100 200 500 1000
Average recurrence interval (years)
P40AA Atlas 14, Volume 2, Version 3 Created [GMTY Fri Aug 20 16:55-20 2021
Back to Too
Maps & aerials
Small scale terrain
Average recurrence
mrerval
{years}
— t
2
10
25
50
100
200
500
1000
Duration
5-mm
-- 2Aay
— 10-min
— 3-day
15-min
— 4Aay
— 70-min
-- 7-day
— 60-min
— 10-day
— 2-hr
— 20-day
-- 3fir
— 36-day
— 6-hr
— 45-day
— 12-hr
— 60-day
24-hr
https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=35.3293&Ion=-82.6391 &data=intensity&units=english&series=pds 2/4

8/20/2021 Precipitation Frequency Data Server
Af 0 U N TA IN
Holly Springs'
ECl
]�Zi)RGE ORR
N
3km .
2mi
jy
Large scale terrain
Kinq�.poit* Bristol
.6
J I) III s011 City 41
Win Stoll -Sal -
Knoxville
FAI fvlit,711a1
ALSIIeVill-E N 0 R T H
Char
110 09C4
4P Greenville +
100km S C1 U T H R C
60mi
-Amens
Large scale map
Kingsport - map
Johnson City
Large scale aerial
https:llhdsc.nws.noaa.gov/hdsc/pfds/pfds-Printpage.html?lat=35.3293&lon=-82.639l &data=intensity&units=english&series=pds 3/4

8/20/2021
Precipitation Frequency Data Server
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.Questionsft_noaa.gov
Disclaimer
https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=35.3293&Ion=-82.6391 &data=intensity&units=english&series=pds 4/4

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359700 350800 350900 351000 351100 351200
Map Scale: 1:5,090 if printed on A portrait (8.5" x 11") sheet.
Meters
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Map projection: Web Mercator Conermordinates: WGS84 Edge tics: lfrM Zone 17N WGS84
usoA Natural Resources Web Soil Survey
Conservation Service National Cooperative Soil Survey
Hydrologic Soil Group —Henderson County, North Carolina
3508M 350900 351000 351100 351200 351300
351400
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35o 19' 59" N
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8/20/2021
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Hydrologic Soil Group —Henderson County, North Carolina
Hydrologic Soil Group
Map unit symbol
Map unit name
Rating
Acres in AOI
Percent of AOI
BaC
Bradson gravelly loam,
7 to 15 percent slopes
B
5.2
4.2%
Co
Codorus loam (arkaqua)
B/D
29.6
23.9%
DeB
Delanco (dillard) loam, 2
to 7 percent slopes
C
5.6
4.5%
FaC
Fannin silt loam, 7 to 15
percent slopes
B
9.8
7.9%
FaE
Fannin silt loam, 15 to
25 percent slopes
B
5.2
4.2%
Ro
Rosman loam
A
1.8
1.4%
TaF
Talladega silt loam, 25
to 45 percent slopes
(brownwood)
B
49.3
39.8%
TeB
Tate fine sandy loam, 2
to 7 percent slopes
C
1.6
1.3%
To
Toxaway silt loam
B/D
1.2
0.9%
TSC
Tusquitee loam, 7 to 15
percent slopes
A
14.5
11.7%
Totals for Area of Interest
123.8
100.0%
USDA Natural Resources Web Soil Survey 8/20/2021
Conservation Service National Cooperative Soil Survey Page 3 of 4

Hydrologic Soil Group —Henderson 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 8/20/2021
Conservation Service National Cooperative Soil Survey Page 4 of 4

35o 19' 59" N
8
8
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93
N
0
93
35o 19' 25" N
359700 350800 350900 351000 351100 351200
Map Scale: 1:5,090 if printed on A portrait (8.5" x 11") sheet.
Meters
N 0 50 100 200 ?00
Feet
0 200 400 800 1200
Map projection: Web Mercator Conermordinates: WGS84 Edge tics: lfrM Zone 17N WGS84
usoA Natural Resources Web Soil Survey
Conservation Service National Cooperative Soil Survey
Soil Map —Henderson County, North Carolina
3508M 350900 351000 351100 351200 351300
351400
351300 351400
35o 19' 59" N
1
35o 19' 25" N
m
8/20/2021
Page 1 of 3

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Soil Map —Henderson County, North Carolina
Map Unit Legend
Map Unit Symbol
Map Unit Name
Acres in AOI
Percent of AOI
BaC
Bradson gravelly loam, 7 to 15
percent slopes
5.2
4.2%
Co
Codorus loam (arkaqua)
29.6
23.9%
DeB
Delanco (dillard) loam, 2 to 7
percent slopes
5.6
4.5%
FaC
Fannin silt loam, 7 to 15
percent slopes
9.8
7.9%
FaE
Fannin silt loam, 15 to 25
percent slopes
5.2
4.2%
Ro
Rosman loam
1.8
1.4%
TaF
Talladega silt loam, 25 to 45
percent slopes (brownwood)
49.3
39.8%
TeB
Tate fine sandy loam, 2 to 7
percent slopes
1.6
1.3%
To
Toxaway silt loam
1.2
0.9%
TSC
Tusquitee loam, 7 to 15
percent slopes
14.5
11.7%
Totals for Area of Interest
123.8
100.0%
USDA Natural Resources Web Soil Survey 8/20/2021
Conservation Service National Cooperative Soil Survey Page 3 of 3

35o 19' 59" N
8
8
o_
93
N
0
93
35o 19' 25" N
359700 350800 350900 351000 351100 351200
Map Scale: 1:5,090 if printed on A portrait (8.5" x 11") sheet.
Meters
N 0 50 100 200 ?00
Feet
0 200 400 800 1200
Map projection: Web Mercator Conermordinates: WGS84 Edge tics: lfrM Zone 17N WGS84
usoA Natural Resources Web Soil Survey
Conservation Service National Cooperative Soil Survey
Depth to Water Table —Henderson County, North Carolina
3508M 350900 351000 351100 351200 351300
351400
351300 351400
35o 19' 59" N
1
35o 19' 25" N
m
8/20/2021
Pagel of 4

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Depth to Water Table —Henderson County, North Carolina
Depth to Water Table
Map unit symbol
Map unit name
Rating (centimeters)
Acres in AOI
Percent of AOI
BaC
Bradson gravelly loam,
7 to 15 percent slopes
>200
5.2
4.2%
Co
Codorus loam (arkaqua)
54
29.6
23.9%
DeB
Delanco (dillard) loam, 2
to 7 percent slopes
91
5.6
4.5%
FaC
Fannin silt loam, 7 to 15
percent slopes
>200
9.8
7.9%
FaE
Fannin silt loam, 15 to
25 percent slopes
>200
5.2
4.2%
Ro
Rosman loam
130
1.8
1.4%
TaF
Talladega silt loam, 25
to 45 percent slopes
(brownwood)
>200
49.3
39.8%
TeB
Tate fine sandy loam, 2
to 7 percent slopes
>200
1.6
1.3%
To
Toxaway silt loam
15
1.2
0.9%
TSC
Tusquitee loam, 7 to 15
percent slopes
>200
14.5
11.7%
Totals for Area of Interest
123.8
100.0%
Description
"Water table" refers to a saturated zone in the soil. It occurs during specified
months. Estimates of the upper limit are based mainly on observations of the
water table at selected sites and on evidence of a saturated zone, namely
grayish colors (redoximorphic features) in the soil. A saturated zone that lasts for
less than a month is not considered a water table.
This attribute is actually recorded as three separate values in the database. A
low value and a high value indicate the range of this attribute for the soil
component. A "representative" value indicates the expected value of this attribute
for the component. For this soil property, only the representative value is used.
Rating Options
Units of Measure: centimeters
Aggregation Method: Dominant Component
Component Percent Cutoff. None Specified
Tie -break Rule: Lower
Interpret Nulls as Zero: No
USDA Natural Resources Web Soil Survey 8/20/2021
am Conservation Service National Cooperative Soil Survey Page 3 of 4

Depth to Water Table —Henderson County, North Carolina
Beginning Month: January
Ending Month: December
USDA Natural Resources Web Soil Survey 8/20/2021
IM Conservation Service National Cooperative Soil Survey Page 4 of 4

Appendix "C"

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