SW5231101_Design Calculations_20240329

Sitework Calculations
Ll
1111 I'1 o -Jewett, /1"Ar -_-
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at Bunn, NC
Owner/Developer:
Robmir Inc.
100 S. Smithfield Rd,
Knightdale, NC 27545
919.497.6906
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STOCKS
ENGINEERING
801 EAST WAS}HINGTON STREET P.O. 80X 1108
NASNNLLE, N.C. 27856 PHONE: [phone]
WWW.S TOCKSETIGINEER1NO.COM

STOCKS
ENGINEERING
Wetland Design
Project: Bunn Subdivision
Location: Bunn, NC
Date: 28-Mar-24
Basin ID: #1
Drainage Area(A) 1.3 Acres
Impervious Area 0.84 Acres
% Impervious(I) 65%
Water Quality Volume
Calculate Rv: Rv=0.05+.9 X I
Rv= 0.63
WQV= 3630XRDXRvXA
Ro= 1.00 Inch
Min. WQV= 2,980 CF
Actual WQV= 3,372 CF
Surface Area
Design Depth = 15.00 INCHES
Surface Area= 2,384 SF
Orifice Sizing
Design Orifice Q= CDAo.J2gHo
CD= 0.6
g= 32.2 FT/S2
Ho= H/3= 0.42 FT
H= 1.25 FT
Ao= 00055 FEET
Design Pipe= 1 INCH
Design Orifice Q= 0.017 CFS
Days to Drain
Wetland Zones
#Wetland
Area in SF %of Total Plants
Deep Pool (Non-Forebay) 255 7% NA
Deep Pool (Forebay) 348 10% NA
Shallow Water 1277 37% 319,25
Temporary Inundation Zone 1569 45% 392,25
Total Wetland Area 460 ',

STOCKS
ENGINEERING
Rip-Rap Outlet Protection
Pipe# FES Into SCM
.104
•�ii. . � Known:
•a.*:11Ii�4+- 18 RCP
3d 0 A _���:,�,�e�+•41Iil A
�l�j�� i�..�l•I Qio= 5.99
.4Pits :eleib!
o �4 i� �� g• Vio= 3.4
1 it�"l141:e0al•i i.
.�•04 jam%iii"i
IfaIll eV 1 .• Min. Required:
Plan wag. La = 8
W= 6
.i amilliLa
„ 3do= 4.5
��•�_� ��,�_��,,: — dso= 0.3 (Rip Rap Size)
• rr 0., VINP. IIT-I II
- -I Id Ve404.:ilex:: 1'4 mil='00061- 7
. Section AA 'Filter
blanket *Use Class B Rip Rap over
Mirafi 140N 18 " in depth.
Rip-Rap Outlet Protection
Pipe# SCM Outlet
•,,• 0.0
• .../•• Known:
3do A I� j��=j'���o�`����A 15 RCP
Hi E ���/.• 1••cradozoilalMeobe V io= 8.25
io
il° IIII IhAigitliktreeteg = 6.7
1=1016•104 •00r Min. Required:
Plan
r•411.06 La = 6
W= 4
1. 1,...„miLa � 3do= 4
dso= 0.3 (Rip Rap Size)
_ :",rami o f ,1: ifi: V II=I I I
1 II I tJ �d '= �e::'�:•:•'loose =III-_.
Section AA 'Filter *Use Class B Rip Rap over
blanket
Mirafi 140N 18 " in depth.

Tar-Pamlico Stormwater Rule 15A NCAC 28.0258 Last Modified 5/23/03
Piedmont of the Tar-Pamlico River Basin:
Includes Oxford,Henderson,Rocky Mount and Tarboro as well as Franklin,Nash and Edgecome Counties
BMP Removal Calculation Worksheet(Automated)
Project Name: E.Jewell Avenue Subdivision Phase 1
Date: 10/25/2023
By: E.A verette Checked By:
Directions:
>It maybe advantageous to split the development into separate catchments to be handled by separate BMPs. The tables below allow
the development to be split into as many as three catchments,and can be copied for greater than three. NOTE:Unless runoff flowing
onto the development from offsite is routed separately around or through the site,the offsite catchment area draining in must be
included in the acreage values of the appropriate land use(s)and treated.
>Above each table:Enter the catchment acreage in the top green blank. Based on a comparison of the post-development TN and TI'
export coefficients you calculated above to the rule requirements of 4.0 lb/ac/yr TN and 0.4 lb/ac/yr TP,select BMP(s)from the list for
treating the catchment runoff. Enter the chosen BMP(s)nutrient removal rates in the green blanks. If more than one BMP is to be
used in series,the combined removal rates will be calculated automatically in the blue blanks.
>Catchment Tables:Enter the acres of each type of land cover in the green boxes. The spreadsheet will calculate all of the light blue
boxes. NOTE:Compare the Total Catchment Acreage for the Development(final table)to the value you established in the pre-BMP
worksheet tables,and also to the site plans,for consistency. All of these values need to be the same
BMP Iketeiifjorl and.:;:; 25 40 NC BMP Manual
Nutrient 'Stort iwn erWe lanil 40 35 NC BMP Manual
............ ...........
.......................
............ ...........
.......................
............ ...........
Removal Siia I?fltet 35 45 NC BMP Manual
Rates jbkteiti`ii€ 35 45 NC BMP Manual
;C;'rgssSiiale [;E? E 20 20 NC BMP Manual
5'ej;eirct(iterStrip r% 20 35 NC BN1P Manual
::frcs el Sp ciitlgi::::::
Dr )<?ej;isflori ' l0 10 NC BMP Manual
Catchment 1:
'Dotal acreage of catchment 1= ac
First BMP's TN removal rate= I % First BMP's'UP removal rate=
Second BMP's TN removal rate= % Second BMP's TP removal rate=
Third BMP's TN removal rate= % Third BMP's'UP removal rate=
TOTAL TN REMOVAL RATE= 40 % TOTAL TP REMOVAL RATE= 35
€ 1 pe of I ?iti over::;:::: :Ciitebiiie:ur Si 1 G`o iiiulii
Trminsjit)rtalipii;riijiei s tufts 5.64 2.60 4.54 0.19 0.33
KPof fiiijiet iQjl$ 5.64 1.95 5.50 0.11 0.31
hlfijiiij eti pety q is`: : 5.64 1A2 3.28 0.28 0.65
€\�'ao teJ.gervious 5.64 0.94 0.00 0.14 0.00
to tijfir is ip thV 00' 5.64 1.95 0.88 0.11 0.05
0.62 14.20 1.34
l
:: t3SiPT
�......N ......otal.Area of De..elyyin.cut. 1.30 10.93 1.03
i•R:TN t 2 7 8.5 0 8
•. liihtl U/ c I>osd lb/.. .
l .f
5 6.

Tar-Pamlico Stormwater Rule 15A NCAC 2B.0258 Last Modified 5/23/03
Catchment 2:
Total acreage of catchment 2= , ac
First 13MP's TN removal rate= I % First BMP's TP removal rate= h
Second BMP's TN removal rate= % Second BMP's TP removal rate=
Third BMP's TN removal rate % Third BMP's TP removal rate= %
TOTAL TN REMOVAL RATE= 0 % TOTAL TP REMOVAL RATE= 0
i01iiiigi iiiss.'..I.0.)'•'isiii.li ! ii:iiiit'!0...... gii iiiiii0$. 2* i :110/::iHWii
ii.:Ii::i.•::•:::T5.0..0!4iiit.:00.i.i :: :•. iifOii*.11(i*S),,IfOii:i0 ::i.n..'i':e00: % .*:.:i:,:,.ii.:: ti.lti: ti:i::.i i':NY.pr.,:.igf,.,Wc::, :::::c910:.T.piii.
is.....:i.:Ai.i6ii:.:';(04 :-..C..8:31)]... s:i.:iii7T61'.fiiiiC.1::::::::::(2) .(3) .:(4). ::i::ot:T.P.itiiii/Li:::: '(2):.?(3},.i.:E6
...i.iii.:',:iiiiii•::::: ::::.:]]:.iiiiiiii..:::::::.::.H....1,..
ti:a00:oititliiii itiljfeitiidtisSi:::i 0.52 2.60 0.00 0.19 0.00
:i'::::',.]Ii.ii':i:].].*:::::i.']..]. ':•:::::i]':!:]]':::]]]•:::]::::isiii]ii
.] ::::i:::i:.i.i].:: •]'.. .]:•:.]. ..:::::. QH::
:::]].i]•]]i]iiitittiff;irilichittiti.ii]iiiiiiiii] 0.52 1.95 0.01 0.11 0.00
]].].]:.':::]]*. W:::::::::::]..]:]*:::::':ii]i]ili.]: •:]•:]]i]
0.52 1.42 0.57 0.28 0.11
]i]].]•:]•:]*:]•:]i]i]:iiiiii]i]•:]•:]]]i]iiii]ii:iiii]iiiiiii
]:::::::::ssii::.]. iiiii::::.:]iii]•::: i.]:::i:sii::EiWi. i]:'
V0004..ge:TS'i00r.ii]iijiiii']':: 0.52 0.94 0.27 0.14 0.04
:::]iiii]ii:His].].*:XiiXii];:.i]:. ::•:•::::]:.]:.:::]:.]:::
4010.it:#.0.In PAP]::::]]:: :: 0.52 1.95 0.00 0.11 0.00
:.,iiii]ii]:::::iiiii].iiiiiiii':]':*:.]:.*:iii•:*],..]i:;:i•:.:i.]:..]:.
it:']:t::i:::::::::::.:•:i.i:ii::1::::::::::*:sii. ss:':',.]..]:..]:::::::::: :.::]::::.i:::::: :. .. :
P'ilittiOit fn:tifet1166§ Pre;1jiiiii.,:'iti i.j" #$.i.iit0
:(1p,-;-:::::*:: 086
]::::•i':i:::,] .]::.]::]::] ',..ii.]::: ]]..i]..]:.] :*:OH s -...:: A 5,!11.A1!)(.1-.:4.): i..i•!? (1iat?/.3'.r)
:::::'.: :..iM:::......,........:::•::•::• •• •:M; Hi. ::::::::::::::::::::::...i: ::::::::::::::::::::::::::::, i:.::::::::::::::::::::::::.
. : pi•kiimie::TN.rtiltiist! Pre-sjampi-r.prriLooil,
lta.tOiKr.OisiOil.)0v.e.(00.!At.i.1 ::::: 1.34 :]i:ii11]*]*1::]iiIiiii iii•?i•:i]Ji.41,k,];. ; 0.64 ::]:]:::::::].i.:•:..0.0._L 0.11
::.:•:.:.:.:.(10.2 1 ,
:•].*:]ii'•i:':iiiiiiiiiiiiii:::::jiiii]iii]ii:].]::•::::::t:.] :•:•:•:•:•:•:•-:•:•:•:•.•.•:.
....iiiP.00.i.t0it...V. 8 86 l'':#st!;41:.1 !! 0.15!zili:40.iiP ' ::i.:i0i*oil:.i0ji0
...................................................................................... ....
......................................................... •••••••••••••••••••.... :....:.:....:....:.:....:.:. :,.......:.:.:.:.:.,......... """".""..:•:•:::•:•"••••••••••••••••
::::.::.::...i:::.:i:i:-:::.:...:i:::::.: ::......iiiiiiiiiiiiiiii iiiii.:...iii.:iiii:.-::.i::. ..]:i:i•-:::::.•:.:.,i:::.:::. •i:i..iiiiNii......tiii.i..t. :::::voitinmr•lx> 0 II
Irt,..:...:::::::::.:::::::::::::::]::::.:::::::::::::::::::i:•:• :...•:•••-••:•*.•:•:•:•:• :•:•:::•:•:•:•:•:•:::•:: ..,:•.•.•••:•:•:::.•:,:••:. :i•14).o it 0 ii.la.):i 0
::-..:::•.•:•:•...................
Catchnteirl 3:
Total acreage of catchment 3= ac
First BMP's TN removal rate= % First BMP's TP removal rate= %
Second BMP's TN removal rate= % Second BM1''s TP removal rate=
Third BMP's TN removal rate= % Third BMP's TP removal rate= %
TOTAL TN REMOVAL RATE= 0 % TOTAL TP REMOVAL RATE= 0
. ..........
i.i.;i:::::::A::.::•:::::.ii:iii:A .ii i Ti::iiifii..ii ) 'aii.'i ::....ii: (4)H.iEIP:MiY00-iiiPii7 iiJ :4
yifttykot4iiii000::IiT:iiii.]ioi(e)iii.o.ioi. .i047:.0000 •...i..mi.i..17,40.*0(1ij ii.i....i,:q9.1pszp!i,ii.:::!:, ..5.00...*;s:1:(.., ::::::-e;p10,,.pili.
.....:. :.A:.e.6ii. i.ii.*.-46::4.:-.:.A.-;•3ii.:. ....:::.*Er.iiiTN:iiiiiiW .. )'...(3)*?':.(4).....--i:.tifite(iiiiii):::. :(2) ::-(3).;.:'.(6)
Tfliii$iiiiilitifitirifiqiiiiiiiii:s:: i 2.60 0.19
...::i :::iM:iii:;:::,YiiiT:i:::iiit:iss4
,.]:*]•: 1Rilitfliii067tiiiii]]]i]:iii.:]i 1.95 0.11
%
:]:.]:. ::•:::i::.]..]ii.]:]siiiiliii•:iiiiisii]iii::
i.iiiiii0itti.i:OVv:i:ii:iii:: 1.42 0.28
Sytitididii.f.tiiie.ai!•:]]]:ii:.*:ii i 0.94 0.14
1/4ts.iiiiir4iri.:iili:11$ki. % ::::: 1.95 0.11
.'::::. :::::.]:]isiii.iii:::;::::iiiii.:::.:i ii•:i:::::::::: i.i.:: :.:.:.:...:.:.,............•.
. . _6giijii: :•]iiiiPi*Ip4pipfy
f tie06ifil:iiiiiiii'kitii:ifY: ::::: •••••••:•:••••"•••1.:•••
:•.':..:;-ti0:0.0:(S.':i.0 :::::::.1mct(1.44).;0],--!
]:]:::]:]:]:::::]:•::::::::
..]::.:riiNi:]i: ,4.1i.**11,!it...ij;;:t P64.-41NIPTP Ei-0.0est
:0.00:fsy.oi ocl.)§.000•;:qi,.0•7:-J .. :::::.....,.:,...:
•::::::::::::.(qt4.e.612.:,
•::::i'.::::'.i']'::::i':::::::: *i''.ii::::::"iiii/A:ti'4
••••••:,••••••••••••:•
.(:.0181P•TN
•••••••••••••••••••••••••••••••••,.......... ..........................................
::......:.::1 04.0($..il 1',.c.1.1 .,(%3./st)7
........................... ............................................., .............................
.................................... ........... ................... ............................. ..,:::::::::•:::::•:•:•:•:•:•
....................................................................................„.:-....,......„....... .:.:...:........:.:.::.....
(itilail507-
::„.,...:....
.................................................,,...,,,............................................................,..„..,

Tar-Pamlico Storm water Rule 15A NCAC 2B.0258 Last Modified 5/23/03
Weighted Average of Nutrient Loadings from the Catchments:
C.atchrnegt Pos113 1[':: ::::::Psi=131111':
:E:A�ee"e'E .. Lvat i t '[':hEoiitlo'::
lb/ac%'r Itilacl•r [
.................................
.............................
.............................
.............................
.............................
..........................................................
1.30 6.56 0.67
CiiCcp`iiciit2 €€ € 1.34 0.64 0.11
Cate}itieiit3 0.00 0.00 0.00
[: 1 1I h:dlt 0*.Y4•oPMEN.' 2.64 3.55 0.39
..................... ......
............ ...............
............................
............ ...............
............................
Note: The nutrient loading goals are 4.0 lb/ac/yr for TN and 0.4 lb/ac/yr for TP. If the post-development nutrient
loading is below these levels,then the BMPs planned are adequate. Otherwise,additional BMPs and/or
modifications in development plans are required.

1
Watershed Model Schematic Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2024
4,0
Rs
Et-3
Project: Pre vs Post- Phase 1.gpw Friday, 03/29/2024

Hydraflow Table of Contents Pre vs Post-Phase 1.gpw
Hydraflow Hydrographs Extension for Autodesk®Civil 3D by Autodesk, Inc.v2024 Friday,03/29/2024
Watershed Model Schematic 1
1 - Year
Summary Report 2
Hydrograph Reports 3
Hydrograph No. 1, SCS Runoff, Pre Dev Area 1 3
Hydrograph No. 2, SCS Runoff, Post Dev To SCM 4
Hydrograph No. 3, SCS Runoff, Post Dev Bypass 5
Hydrograph No. 4, Reservoir, Wetland #1 Outflow 6
Pond Report- Wetland #1 7
Hydrograph No. 5, Combine, Total Post Dev 8
10 - Year
Summary Report 9
Hydrograph Reports 10
Hydrograph No. 1, SCS Runoff, Pre Dev Area 1 10
Hydrograph No. 2, SCS Runoff, Post Dev To SCM 11
Hydrograph No. 3, SCS Runoff, Post Dev Bypass 12
Hydrograph No. 4, Reservoir, Wetland #1 Outflow 13
Hydrograph No. 5, Combine, Total Post Dev 14
25 - Year
Summary Report 15
Hydrograph Reports 16
Hydrograph No. 1, SCS Runoff, Pre Dev Area 1 16
Hydrograph No. 2, SCS Runoff, Post Dev To SCM 17
Hydrograph No. 3, SCS Runoff, Post Dev Bypass 18
Hydrograph No. 4, Reservoir, Wetland #1 Outflow 19
Hydrograph No. 5, Combine, Total Post Dev 20
100 - Year
Summary Report 21
Hydrograph Reports 22
Hydrograph No. 1, SCS Runoff, Pre Dev Area 1 22
Hydrograph No. 2, SCS Runoff, Post Dev To SCM 23
Hydrograph No. 3, SCS Runoff, Post Dev Bypass 24
Hydrograph No. 4, Reservoir, Wetland #1 Outflow 25
Hydrograph No. 5, Combine, Total Post Dev 26

2
Hydrograph Summary Report
ydra11ow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2024
Hyd. Hydrograph Peak Time Time to Hyd. inflow Maximum Total Hydrograph
No. type flow Interval Peak volume hyd(s) elevation strge used Description
(origin) (cfs) (min) (min) (cuft) (ft) (cuft)
1 SCS Runoff 1.759 2 718 3,877 Pre Dev Area 1
2 SCS Runoff 3.114 2 716 6,341 Post Dev To SCM
3 SCS Runoff 1.132 2 718 2,379 Post Dev Bypass
4 Reservoir 0.152 2 784 6,301 2 253.36 3,784 Wetland#1 Outflow
5 Combine 1.439 2 718 8,407 3,4 Total Post Dev
Pre vs Post- Phase 1.gpw Return Period: 1 Year Friday, 03/29/2024

3
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D0 by Autodesk, Inc.v2024 Friday,03/29/2024
Hyd. No. 1
Pre Dev Area 1
Hydrograph type = SCS Runoff Peak discharge = 1.759 cfs
Storm frequency = 1 yrs Time to peak = 11.97 hrs
Time interval = 2 min Hyd. volume = 3,877 cuft
Drainage area = 2.640 ac Curve number = 70
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = User Time of conc. (Tc) = 5.00 min
Total precip. = 2.45 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
Pre Dev Area 1
o (cfs) Hyd. No. 1 -- 1 Year Q (cfs)
2.00 2.00
1.00 1.00
0.00 - _. _ 0.00
0 2 4 6 8 10 12 14 16 18 20 22 24 26
Hyd No. 1 Time (hrs)

4
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2024 Friday,03 I 29/2024
Hyd. No. 2
Post Dev To SCM
Hydrograph type = SCS Runoff Peak discharge = 3.114 cfs
Storm frequency = 1 yrs Time to peak = 11 .93 hrs
Time interval = 2 min Hyd. volume = 6,341 cuft
Drainage area = 1.300 ac Curve number = 89.3
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = User Time of conc. (Tc) = 5.00 min
Total precip. = 2.45 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
Post Dev To SCM
Q (cfs) Hyd. No. 2 -- 1 Year Q (cfs)
4.00 4.00
3.00 3.00
2.00 2.00
1.00 1.00
0.00 . T -- - - -, 0.00
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hrs)
6--- Hyd No. 2

5
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2024 Friday,03/29/2024
Hyd. No. 3
Post Dev Bypass
Hydrograph type = SCS Runoff Peak discharge = 1.132 cfs
Storm frequency = 1 yrs Time to peak = 11.97 hrs
Time interval = 2 min Hyd. volume = 2,379 cuft
Drainage area = 1.340 ac Curve number = 72.5
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = User Time of conc. (Tc) = 5.00 min
Total precip. = 2.45 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
Post Dev Bypass
Q (cfs) Hyd. No. 3 -- 1 Year Q (cfs)
2.00 2.00
1.00 1.00
0.00 — - -- • — 0.00
0 2 4 6 8 10 12 14 16 18 20 22 24 26
Hyd No. 3 Time (hrs)

6
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2024 Friday,03/29/2024
Hyd. No. 4
Wetland #1 Outflow
Hydrograph type = Reservoir Peak discharge = 0.152 cfs
Storm frequency = 1 yrs Time to peak = 13.07 hrs
Time interval = 2 min Hyd. volume = 6,301 cuft
Inflow hyd. No. = 2 - Post Dev To SCM Max. Elevation = 253.36 ft
Reservoir name = Wetland #1 Max. Storage = 3,784 cuft
Storage Indication method used.
Wetland #1 Outflow
Q (cfs) Hyd. No. 4 -- 1 Year Q (cfs)
4.00 4.00
3.00 3.00
2.00 2.00
1.00 1.00
),444.?„._.
0 8 16 24 32 40 48 56 64 72 80 88 96
Time (hrs)
-- --- Hyd No. 4 Hyd No. 2 II I TTTTI Total storage used = 3,784 cuft

Pond Report 7
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2024 Friday,03/29/2024
Pond No. 1 - Wetland #1
Pond Data
Contours-User-defined contour areas.Average end area method used for volume calculation.Begining Elevation=252.00 ft
Stage/Storage Table
Stage(ft) Elevation(ft) Contour area(sqft) Incr.Storage(cuft) Total storage(cuft)
0.00 252.00 1,880 0 0
1.00 253.00 3,208 2,544 2,544
1.06 253.06 3,230 193 2,737
1.25 253.25 3,449 635 3,372
2.00 255.00 4,389 2,939 6,311
3.00 255.00 5,684 5,036 11,347
3.50 255.50 7,277 3,240 14,588
Culvert/Orifice Structures Weir Structures
[A] [B] [C] [PrfRsr] [A] [B] [C] [D]
Rise(in) = 15.00 1.00 6.00 0.00 Crest Len(ft) = 10.00 10.00 0.00 0.00
Span(in) = 15.00 1.00 12.00 0.00 Crest El.(ft) = 254.00 255.00 0.00 0.00
No.Barrels = 1 1 1 0 Weir Coeff. = 3.33 2.60 3.33 3.33
Invert El.(ft) = 251.65 252.00 253.25 0.00 Weir Type = Rect Broad --- ---
Length(ft) = 25.00 0.50 0.50 0.00 Multi-Stage = Yes No No No
Slope(%) = 0.50 0.00 0.00 n/a
N-Value = .013 .013 .013 n/a
Orifice Coeff. = 0.60 0.60 0.60 0.60 Exfil.(in/hr) = 0.000(by Wet area)
Multi-Stage = n/a Yes Yes No TW Elev.(ft) = 0.00
Note:Culvert/Orifice outflows are analyzed under inlet(ic)and outlet(oc)control. Weir risers checked for orifice conditions(ic)and submergence(s).
Stage(ft) Stage/ Discharge Elev(ft)
4.00 . 256.00
3.00 255.00
2.00 - 254.00
1.00 253.00
0.00 - 252.00
0.00 3.00 6.00 9.00 12.00 15.00 18.00 21.00 24.00 27.00 30.00 33.00 36.00
Total Q Discharge(cfs)

8
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2024 Friday,03/29/2024
Hyd. No. 5
Total Post Dev
Hydrograph type = Combine Peak discharge = 1.439 cfs
Storm frequency = 1 yrs Time to peak = 11.97 hrs
Time interval = 2 min Hyd. volume = 8,407 cuft
Inflow hyds. = 3, 4 Contrib. drain. area = 1 .340 ac
Total Post Dev
Q (cfs) Hyd. No. 5 -- 1 Year Q (cfs)
2.00 2.00
1.00 1.00
I
0 6 12 18 24 30 36 42 48 54 60
Time (hrs)
---�- Hyd No. 5 Hyd No. 3 Hyd No. 4

9
Hydrograph Summary Report,
ydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc,v2024
Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph
No. type flow interval Peak volume hyd(s) elevation strge used Description
(origin) (cfs) (min) (min) (cult) (ft) (cult)
1 SCS Runoff 9.563 2 718 19,165 Pre Dev Area 1
2 SCS Runoff 8,131 2 716 17,378 Post Dev To SCM
3 SCS Runoff 5.301 2 718 10,673 Post Dev Bypass
4 Reservoir 8.257 2 718 17,337 2 254.81 6,258 Wetland#1 Outflow
5 Combine 8.366 2 720 27,842 3,4 Total Post Dev
Pre vs Post - Phase 1.gpw Return Period: 10 Year Friday, 03/29 1 2024

10
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk,Inc.v2024 Friday,03/29/2024
Hyd. No. 1
Pre Dev Area 1
Hydrograph type = SCS Runoff Peak discharge = 9.563 cfs
Storm frequency = 10 yrs Time to peak = 11.97 hrs
Time interval = 2 min Hyd. volume = 19,165 cuft
Drainage area = 2.640 ac Curve number = 70
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = User Time of conc. (Tc) = 5.00 min
Total precip. = 5.13 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
Pre Dev Area 1
Q (cfs) Hyd. No. 1 -- 10 Year Q (cfs)
10.00 10.00
8.00 8.00
6.00 6.00
4.00 4.00
2.00 2.00
0.00 - ` 0.00
0 2 4 6 8 10 12 14 16 18 20 22 24 26
Time(hrs)
Hyd No. 1

11
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk,Inc.v2024 Friday,03/29/2024
Hyd. No. 2
Post Dev To SCM
Hydrograph type = SCS Runoff Peak discharge = 8.131 cfs
Storm frequency = 10 yrs Time to peak = 11.93 hrs
Time interval = 2 min Hyd. volume = 17,378 cuft
Drainage area = 1.300 ac Curve number = 89.3
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = User Time of conc. (Tc) = 5.00 min
Total precip. = 5.13 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
Post Dev To SCM
Q (cfs) Hyd. No. 2 -- 10 Year Q (cfs)
10.00 10.00
8.00 8.00
6.00 6.00
4.00 4.00
2.00 2.00
0.00 0.00
0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0
Hyd No. 2 Time (hrs)

12
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2024 Friday,03/29/2024
Hyd. No. 3
Post Dev Bypass
Hydrograph type = SCS Runoff Peak discharge = 5.301 cfs
Storm frequency = 10 yrs Time to peak = 11.97 hrs
Time interval = 2 min Hyd. volume = 10,673 cuft
Drainage area = 1.340 ac Curve number = 72.5
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = User Time of conc. (Tc) = 5.00 min
Total precip. = 5.13 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
Post Dev Bypass
Q (cfs) Hyd. No. 3 -- 10 Year 0 (cfs)
6.00 6.00
5.00 5.00
4.00 4.00
3.00 3.00
2.00 2.00
1.00 1.00
0.00 — - - k 0.00
0 2 4 6 8 10 12 14 16 18 20 22 24 26
Hyd No. 3 Time (hrs)

13
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2024 Friday,03/29/2024
Hyd. No. 4
Wetland #1 Outflow
Hydrograph type = Reservoir Peak discharge = 8.257 cfs
Storm frequency = 10 yrs Time to peak = 11.97 hrs
Time interval = 2 min Hyd. volume = 17,337 cuft
Inflow hyd. No. = 2 - Post Dev To SCM Max. Elevation = 254.81 ft
Reservoir name = Wetland #1 Max. Storage = 6,258 cuft
Storage Indication method used.
Wetland #1 Outflow
Q (cfs) Hyd. No. 4 -- 10 Year Q (cfs)
10.00 10.00
8.00 8.00
6.00 6.00
4.00 4.00
2.00 - S 2.00
0.00 0.00
0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0
Time (hrs)
Hyd No. 4 Hyd No. 2 11 1 1 1 1 1 1 Total storage used = 6,258 cuft

14
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk,Inc.v2024 Friday,03/29/2024
Hyd. No. 5
Total Post Dev
Hydrograph type = Combine Peak discharge = 8.366 cfs
Storm frequency = 10 yrs Time to peak = 12.00 hrs
Time interval = 2 min Hyd. volume = 27,842 cuft
Inflow hyds. = 3, 4 Contrib. drain. area = 1.340 ac
Total Post Dev
Q (cfs) Hyd. No. 5 -- 10 Year Q (cfs)
10.00 10.00
8.00 8.00
6.00 6.00
4.00 4.00
2.00 2.00
0.00 = i 0.00
0 2 4 6 8 10 12 14 16 18 20 22 24 26
Time (hrs)
Hyd No. 5 Hyd No. 3 Hyd No. 4

15
Hydrograph Summary Reportydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2024
Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph
No. type flow interval Peak volume hyd(s) elevation strge used Description
(origin) (cfs) (min) (min) (cuff) (ft) (cuft)
1 SCS Runoff 12.94 2 716 26,132 Pre Dev Area 1
2 SCS Runoff 9.992 2 716 21,654 Post Dev To SCM
3 SCS Runoff 7.104 2 716 14,356 Post Dev Bypass
4 Reservoir 9.731 2 718 21,614 2 255.00 6,324 Wetland#1 Outflow
5 Combine 14.00 2 718 35,847 3,4 Total Post Dev
Pre vs Post- Phase 1.gpw Return Period: 25 Year Friday, 03/29/2024

16
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2024 Friday,03/29/2024
Hyd. No. 1
Pre Dev Area 1
Hydrograph type = SCS Runoff Peak discharge = 12.94 cfs
Storm frequency = 25 yrs Time to peak = 11.93 hrs
Time interval = 2 min Hyd. volume = 26,132 cuft
Drainage area = 2.640 ac Curve number = 70
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = User Time of conc. (Tc) = 5.00 min
Total precip. = 6.13 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
Pre Dev Area 1
Q (cfs) Hyd. No. 1 -- 25 Year Q (cfs)
14.00 14.00
12.00 1 12.00
10.00 10.00
J 8.00 8.00
6.00 6.00
4.00 4.00
:::
J \,,,,...
2.00
- - = i t - 0.00
0 2 4 6 8 10 12 14 16 18 20 22 24 26
�---- Hyd No. 1 Time (hrs)

17
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk,Inc.v2024 Friday,03/29/2024
Hyd. No. 2
Post Dev To SCM
Hydrograph type = SCS Runoff Peak discharge = 9.992 cfs
Storm frequency = 25 yrs Time to peak = 11.93 hrs
Time interval = 2 min Hyd. volume = 21,654 cuft
Drainage area = 1.300 ac Curve number = 89.3
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = User Time of conc. (Tc) = 5.00 min
Total precip. = 6.13 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
Post Dev To SCM
Q (cfs) Hyd. No. 2 --25 Year Q (cfs)
10.00 10.00
8.00 8.00
6.00 6.00
4.00 4.00
2.00 2.00
0.00 0.00
0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0
Hyd No. 2 Time(hrs)

18
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2024 Friday,03/29/2024
Hyd. No. 3
Post Dev Bypass
Hydrograph type = SCS Runoff Peak discharge = 7.104 cfs
Storm frequency = 25 yrs Time to peak = 11.93 hrs
Time interval = 2 min Hyd. volume = 14,356 cuft
Drainage area = 1 .340 ac Curve number = 72.5
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = User Time of conc. (Tc) = 5.00 min
Total precip. = 6.13 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
Post Dev Bypass
Q (cfs) Hyd. No. 3 -- 25 Year Q (cfs)
8.00 8.00
6.00 6.00
4.00 - - 4.00
2.00 2.00
0.00 — . - . _ _ Tw_. ,_ -..---,---- —, 0.00
0 2 4 6 8 10 12 14 16 18 20 22 24
• - Hyd No. 3 Time (hrs)

19
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2024 Friday,03/29/2024
Hyd. No. 4
Wetland #1 Outflow
Hydrograph type = Reservoir Peak discharge = 9.731 cfs
Storm frequency = 25 yrs Time to peak = 11 .97 hrs
Time interval = 2 min Hyd. volume = 21 ,614 cuft
Inflow hyd. No. = 2 - Post Dev To SCM Max. Elevation = 255.00 ft
Reservoir name = Wetland #1 Max. Storage = 6,324 cuft
Storage Indication method used.
Wetland #1 Outflow
Q (cfs) Hyd. No. 4 --25 Year Q (cfs)
10.00 10.00
8.00 8.00
6.00 6.00
4.00 4.00
2.00 — 2.00
0.00 ."� 0.00
0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0
Time (hrs)
Hyd No. 4 Hyd No. 2 fl ITTTTI Total storage used = 6,324 cuft

20
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2024 Friday, 03/29/2024
Hyd. No. 5
Total Post Dev
Hydrograph type = Combine Peak discharge = 14.00 cfs
Storm frequency = 25 yrs Time to peak = 11.97 hrs
Time interval = 2 min Hyd. volume = 35,847 cuft
Inflow hyds. = 3, 4 Contrib. drain. area = 1.340 ac
Total Post Dev
Q (cfs) Hyd. No. 5 -- 25 Year Q (cfs)
15.00 15.00
12.00 12.00
9.00 9.00
6.00 6.00
3.00 3.00
0.00 — =— 0.00
0 2 4 6 8 10 12 14 16 18 20 22 24 26
Time (hrs)
Hyd No. 5 Hyd No. 3 Hyd No. 4

21
Hydrograph Summary Reportydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2024
Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph
No. type flow interval Peak volume hyd(s) elevation strge used Description
(origin) (cfs) (min) (min) (cuft) (ft) (cuft)
1 SCS Runoff 18.99 2 716 38,492 Pre Dev Area 1
2 SCS Runoff 13.06 2 716 28,828 Post Dev To SCM
3 SCS Runoff 10.23 2 716 20,828 Post Dev Bypass
4 Reservoir 11.10 2 720 28,788 2 255.12 6,932 Wetland#1 Outflow
5 Combine 19.48 2 718 49,561 3,4 Total Post Dev
Pre vs Post- Phase 1.gpw Return Period: 100 Year Friday, 03/29/2024

22
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2024 Friday,03/29/2024
Hyd. No. 1
Pre Dev Area 1
Hydrograph type = SCS Runoff Peak discharge = 18.99 cfs
Storm frequency = 100 yrs Time to peak = 11.93 hrs
Time interval = 2 min Hyd. volume = 38,492 cuft
Drainage area = 2.640 ac Curve number = 70
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = User Time of conc. (Tc) = 5.00 min
Total precip. = 7.79 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
Pre Dev Area 1
Q (cfs) Hyd. No. 1 -- 100 Year Q (cfs)
21.00 21.00
18.00 18.00
15.00 fi 15.00
I
12.00 12.00
9.00 9.00
6.00 6.00
3.00 3.00
0.00 — ,-<- ,��.� 0.00
0 2 4 6 8 10 12 14 16 18 20 22 24
Hyd No. 1 Time (hrs)

23
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2024 Friday,03/29/2024
Hyd. No. 2
Post Dev To SCM
Hydrograph type = SCS Runoff Peak discharge = 13.06 cfs
Storm frequency = 100 yrs Time to peak = 11.93 hrs
Time interval = 2 min Hyd. volume = 28,828 cuft
Drainage area = 1.300 ac Curve number = 89.3
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = User Time of conc. (Tc) = 5.00 min
Total precip. = 7.79 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
Post Dev To SCM
Q (cfs) Hyd. No. 2 -- 100 Year Q (cfs)
14.00 14.00
12.00 12.00
10.00 10.00
8.00 8.00
6.00 6.00
4.00 4.00
2.00 2.00
-0,1 C*...„
0.00 -- -_ _ _..�. �_.-..r. --.-- I ``f - -1---- 0.00
0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0
Hyd No. 2 Time (hrs)

24
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk,Inc.v2024 Friday,03/29/2024
Hyd. No. 3
Post Dev Bypass
Hydrograph type = SCS Runoff Peak discharge = 10.23 cfs
Storm frequency = 100 yrs Time to peak = 11.93 hrs
Time interval = 2 min Hyd. volume = 20,828 cuft
Drainage area = 1.340 ac Curve number = 72.5
Basin Slope = 0.0 % Hydraulic length = 0 ft
Tc method = User Time of conc. (Tc) = 5.00 min
Total precip. = 7.79 in Distribution = Type II
Storm duration = 24 hrs Shape factor = 484
Post Dev Bypass
Q (cfs) Hyd. No. 3 -- 100 Year Q (cfs)
12.00 12.00
10.00 I 10.00
8.00 8.00
6.00 6.00
4.00 4.00
2.00 2.00
0.00 - 0.00
0 2 4 6 8 10 12 14 16 18 20 22 24
Hyd No. 3 Time (hrs)

25
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2024 Friday,03/29/2024
Hyd. No. 4
Wetland #1 Outflow
Hydrograph type = Reservoir Peak discharge = 11.10 cfs
Storm frequency = 100 yrs Time to peak = 12.00 hrs
Time interval = 2 min Hyd. volume = 28,788 cuft
Inflow hyd. No. = 2 - Post Dev To SCM Max. Elevation = 255.12 ft
Reservoir name = Wetland #1 Max. Storage = 6,932 cuft
Storage Indication method used.
Wetland #1 Outflow
Q (cfs) Hyd. No. 4 -- 100 Year Q (cfs)
14.00 14.00
12.00 12.00
10.00 10.00
8.00 8.00
6.00 6.00
4.00 4.00
2.00 2.00
0.00 - -- 110 ' 0.00
0 2 4 6 8 10 12 14 16 18 20 22 24
Time (hrs)
- Hyd No. 4 Hyd No. 2 lITTI Ill Total storage used = 6,932 cuft

26
Hydrograph Report
Hydraflow Hydrographs Extension for Autodesk®Civil 3D®by Autodesk, Inc.v2024 Friday,03/29/2024
Hyd. No. 5
Total Post Dev
Hydrograph type = Combine Peak discharge = 19.48 cfs
Storm frequency = 100 yrs Time to peak = 11 .97 hrs
Time interval = 2 min Hyd. volume = 49,561 cuft
Inflow hyds. = 3, 4 Contrib. drain, area = 1.340 ac
Total Post Dev
Q (cfs) Hyd. No. 5 -- 100 Year Q (cfs)
21.00 21.00
18.00 1 18.00
15.00 15.00
12.00 12.00
9.00 9.00
6.00 6.00
3.00 3.00
0.00 — - ---y-- 0.00
0 2 4 6 8 10 12 14 16 18 20 22 24 26
Time (hrs)
.� Hyd No. 5 Hyd No. 3 Hyd No. 4

STOCKS
ENGINEERING
Curve Numbers
Project: E.Jewett Ave Subdivision
Location: Bunn, NC
Date: 26-Oct-23
Basin ID: Pre Dev.Area 1
Drainage Area (A) 2.64 Acres
Runoff Curve Numbers
Cover Description
Cover Type and Hydrologic Condition I A Area(ac)I B Area(ac)I C Area(ac)I D Area (ac)
Cultivated Land
Without Conservation Treatment _ 72 81 88 91
With Conservation Treatment 62 71 78 81
Wood of Forest Land
Poor Cover(Thin) 45 66 77 83
Good Cover 25 55 70 2.64 77
Open Spance(lawns, parks, cemeteries, etc
Poor Condition 68 79 86 89
(grass cover<50%)
Fair Condition 49 69 79 84
(grass cover 50%-75%)
Good Condition 39 0 61 74 80
(grass cover>75%)
Impervious Area
Parking Lots, Roofs, Drives, etc. 98 98 98 98
Soil Area per Hydrologic Group 0 0 2.64 0
Drainage Area=Area Total TRUE 2.64 = 2.64
Weighted Curve Number
CN = [(CNi*Ai)+ (CNn*An)1/Atot
Post Development Area 3 Curve Number 70.00

STOCKS
ENGINEERING
Curve Numbers
Project: E.Jewett Ave Subdivision
Location: Bunn, NC
Date: 26-Oct-23
Basin ID: Post Dev.Area 1 to SCM 1
Drainage Area (A) 1.15 Acres
Runoff Curve Numbers
Cover Description
Cover Type and Hydrologic Condition I A Area(ac)I B Area(ac)I C Area(ac)I D Area (ac)
Cultivated Land
Without Conservation Treatment _ 72 81 88 91
With Conservation Treatment 62 71 78 81
Wood of Forest Land
Poor Cover(Thin) 45 66 77 83 0
Good Cover 25 55 70 77
Open Spance(lawns, parks, cemeteries, etc
Poor Condition 68 79 86 89
(grass cover<50%)
Fair Condition 49 69 79 84
(grass cover 50%-75%)
Good Condition 39 0 61 74 0.44 80
(grass cover>75%)
Impervious Area
Parking Lots, Roofs, Drives, etc. 98 98 98 0.71 98
Soil Area per Hydrologic Group 0 0 1.15 0
Drainage Area=Area Total TRUE 1.15 = 1.15
Weighted Curve Number
CN = [(CN1*A0+ (CNn*An)]/Atot
Post Development Area 3 Curve Number 88.82

STOCKS
ENGINEERING
Curve Numbers
Project: E.Jewett Ave Subdivision
Location: Bunn, NC
Date: 26-Oct-23
Basin ID: Bypass SCM 1
Drainage Area (A) 1.49 Acres
Runoff Curve Numbers
Cover Description
Cover Type and Hydrologic Condition I A Area(ac)I B Area(ac)I C Area(ac)I D Area (ac)
Cultivated Land
Without Conservation Treatment _ 72 81 88 91
With Conservation Treatment 62 71 78 81
Wood of Forest Land
Poor Cover(Thin) 45 66 77 83 0
Good Cover 25 55 70 0.56 77
Open Spance(lawns, parks, cemeteries, etc
Poor Condition 68 79 86 89
(grass cover<50%)
Fair Condition 49 69 79 84
(grass cover 50%-75%)
Good Condition 39 0 61 74 0.81 80
(grass cover>75%)
Impervious Area
Parking Lots, Roofs, Drives, etc. 98 98 98 0.12 98
Soil Area per Hydrologic Group 0 0 1.49 0
Drainage Area=Area Total TRUE 1.49 = 1.49
Weighted Curve Number
CN = [(CN1*A0+ (CNn*An)]/Atot
Post Development Area 3 Curve Number 74.43

STOCKS
ENGINEERING
Wetland Design
Project: Bunn Subdivision
Location: Bunn, NC
Date: 26-Oct-23
Basin ID: #1
Drainage Area (A) 1.15 Acres
Impervious Area 0.77 Acres
Impervious(I) 67%
Water Quality Volume
Calculate Rv: Rv=0.05+.9 X I
Rv= 0.65
WQV= 3630XRDXRvXA
RD= 1.00 Inch
WQV= 2,724 CF
Surface Area
Design Depth= 15.00 INCHES
Surface Area= 2,179 SF
Orifice Sizing
Design Orifice Q= CoAo V2gHo
CD= 0.6
g= 32.2 FT/S2
Ho= H/3= 0.42 FT
H= 1.25 FT
Ao= 0.0055 FEET
Design Pipe= 1 INCH
Design Orifice Q= 0.017 CFS
Days to Drain = 1.9
Wetland Zones
#Wetland
Area in SF %of Total Plants
Deep Pool (Non-Forebay) 255 7% NA
Deep Pool (Forebay) 348 10% NA
Shallow Water 1277 37% 319.25
Temporary Inundation Zone 1569 45% 392.25
Total Wetland Area 3450.0

10/23/23,5:06 PM Precipitation Frequency Data Server
NOAA Atlas 14,Volume 2,Version 3 LOUISBURG
Station ID:31-5123
io'°` Location name: Louisburg, North Carolina, USA* � '`'''
V Latitude:36.1028°,Longitude: -78.3039° - none 1
Elevation: ;
c Elevation(station metadata):260 ft** N..,. .of
*source:ESRI 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
Average recurrence interval(years)
Duration
1 2 5 10 25 50 100 200 500 1000
5-min 0.408 0.472 0.533 0.605 I 0.673 0.730 0.781 0.826 0.877 0.925
(0.373-0.447) (0.433-0.516) (0.488-0.582) (0.552-0.660) (0.612-0.734) (0.661-0.797) (0.702-0.852) (0.738-0.904) (0.777-0.961) (0.813-1.02)
10-min 0.652 0.755 0.854 0.967 1.07 1.16 1.24 1.31 1.39 1.46
(0.596-0.715) (0.692-0.825) (0.782-0.933) (0.883-1.06)_ (0.975-1.17) (1.05-1.27) (1.12-1.35) (1.17-1.43) (1.23-1.52) (1.28-1.60)
15-min 0.815 0.949 1.08 1.22 1.36 1.47 I 1.57 1.65 1.74 1.83
(0.745-0.893) (0.870-1.04) (0.989-1.18) (1.12-1.34) (1.24-1.48) (1.33-1.61) (1.41-1.71) (1.48-1.81) (1.55-1.91) (1.61-2.01)
30-min 1.12 1.31 1.54 1.77 I 2.01 2.22 2.40 2.57 2.78 2.96
(1.02-1.22) (1.20-1.43) (1.40-1.68) (1.62-1.94) I (1.83-2.20) (2.01-2.42) (2.16-2.62) (2.30-2.81) I (2.46-3.04) (2.60-3.25)
60-min 1.39 1.64 1.97 2.31 2.68 3.00 3.31 3.61 3.98 4.32
(1.27-1.53) (1.51-1.80) (1.80-2.15) (2.11-2.52)_ (2.44-2.92) (2.72-3.28)_ (2.98-3.61) (3.22-3.95) (3.53-4.37) (3.80-4.75)
2-hr 1.64 1.94 2.35 2.79 3.29 3.75 4.19 4.64 5.23 5.79
(1.49-1.81) (1.77-2.13) (2.14-2.58) (2.53-3.06) (2.96-3.60) (3.36-4.10) (3.73-4.58) (4.11-5.07) (4.58-5.73)_ (5.02-6.35)
3-hr 1.75 2.07 2.51 3.00 3.57 I 4.10 4.62 5.18 5.91 I 6.62
(1.58-1.94) (1.88-2.29)_ (2.28-2.78) (2.71-3.31) I (3.21-3.93) I (3.66-4.52) i (4.10-5.09) (4.55-5.69) (5.14-6.50) (5.68-7.30)
6-hr 2.09 2.48 3.01 3.60 4.30 4.97 5.63 6.33 7.28 8.20
(1.90-2.32) (2.25-2.74) (2.72-3.32) (3.26-3.97) (3.87-4.74) (4.43-5.46) (4.98-6.18) (5.55-6.94) (6.30-7.99) (6.99-9.01)
12-hr 2.45 2.91 3.55 4.27 5.15 5.99 6.83 7.74 9.00 10.2
(2.24-2.71)_ (2.67-3.20) (3.24-3.91) (3.89-4.70) (4.66-5.64) (5.37-6.54) (6.06-7.45) (6.80-8.44) (7.77-9.81) (8.69-11.2)
24-hr 2.90 3.50 4.41 I 5.13 6.13 6.95 7.79 8.69 9.94 10.9
(2.72-3.11) (3.28-3.76) (4.12-4.73) I (4.78-5.50) (5.70-6.58) (6.43-7.45) (7.18-8.37) (7.95-9.34) (9.03-10.7) I (9.88-11.8)
2-day 3.37 4.06 5.08 5.88 6.98 7.88 8.80 9.77 11.1 12.2
(3.17-3.60) (3.82-4.34) (4.76-5.42) (5.50-6.28) (6.51-7.47) (7.31-8.42) (8.14-9.42) (8.99-10.5) (10.1-12.0) (11.1-13.2)
3-day 3.57 4.30 4 . .
(3.35-3.80) (4.04-4.58) (5.01-5.69)5.34 (5.78-6.57)6.17 (6.82-7.79)7.32 (7.65-8.28.78) (8.50-9.81)9.20 (9.38-10.9)10.2 (10.6-11162.4) (11.5-12173.7)
4-day 3.77 4.53 5.61 6.46 7.65 8.60 9.59 10.6 12.0 13.2
(3.54-4.01) (4.25-4.81) (5.26-5.95) (6.05-6.86)_ (7.13-8.12) (7.99-9.14) (8.87-10.2) (9.76-11.3) (11.0-12.9) (12.0-14.1)
7-day 4.38 5.23 6.40 7.33 8.61 9.64 10.7 11.8 I 13.3 I 14.6
(4.12-4.67) (4.92-5.57) (6.01-6.81) (6.86-7.80) (8.03-9.17) (8.96-10.3) (9.91-11.4) (10.9-12.6) (12.2-14.3) (13.2-15.7)
10-day 5.00 5.95 7.18 8.16 9.48 10.5 11.6 12.7 14.2 15.4
(4.70-5.31) (5.59-6.32) (6.75-7.62) (7.65-8.65) (8.86-10.1) (9.81-11.2) (10.8-12.4) (11.8-13.5) (13.1-15.2) (14.1-16.5)
20-day 6.69 7.91 9.39 10.6 12.2 13.4 14.7 16.0 17.8 19.2
(6.32-7.08) (7.48-8.37) (8.87-9.93) (9.96-11.2) (11.4-12.9) (12.6-14.2) (13.7-15.6) (14.9-17.0) (16.5-19.0) (17.7-20.5)
30-day 8.30 9.77 11.4 12.7 14.4 15.7 17.0 18.3 20.1 21.4
(7.88-8.75) (9.28-10.3) (10.8-12.0) (12.0-13.4) (13.6-15.2) (14.8-16.6) (16.0-18.0) (17.2-19.4) (18.7-21.3) (19.9-22.8)
45-day 10.5 12.3 14.2 15.6 I 17.5 18.9 20.3 21.7 23.6 25.0
(10.0-11.1) (11.8-13.0) (13.5-14.9) (14.8-16.4) (16.6-18.4) (17.9-19.9) (19.2-21.4) (20.4-22.9) 1 (22.1-24.9) I (23.3-26.5)
60-day 12.6 14.8 16.8 18.3 20.3 21.8 23.3 24.7 26.5 27.9
(12.1-13.2) (14.1-15.4) (16.0-17.5) (17.4-19.1) I (19.3-21.2) (20.7-22.8) (22.0-24.4) (23.3-25.9) (25.0-27.9) (26.3-29.5)
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
(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
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10/23/23,5:06 PM Precipitation Frequency Data Server
PDS-based depth-duration-frequency (DDF) curves
Latitude: 36.1028°, Longitude: -78.3039°
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interval
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1 2 5 10 25 50 100 200 500 1000 -
Average recurrence interval (years)
NOAA Atlas 14,Volume 2,Version 3 Created(GMT):Mon Oct 23 21:05:54 2023
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Maps & aerials
Small scale terrain
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10/23/23,5:06 PM Precipitation Frequency Data Server
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10/23/23,5:06 PM 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(cilnoaa.gov
Disclaimer
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USDA United States A product of the National Custom Soil Resource
Department of Cooperative Soil Survey,
Agriculture a joint effort of the United Report for
States Department of
RC S Agriculture and other Franklin County
Federal agencies, State
Naturalagencies including the North Carolina
Resources Agricultural Experiment
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September 1, 2023

Preface
Soil surveys contain information that affects land use planning in survey areas.
They highlight soil limitations that affect various land uses and provide information
about the properties of the soils in the survey areas. Soil surveys are designed for
many different users, including farmers, ranchers, foresters, agronomists, urban
planners, community officials, engineers, developers, builders, and home buyers.
Also, conservationists, teachers, students, and specialists in recreation, waste
disposal, and pollution control can use the surveys to help them understand,
protect, or enhance the environment.
Various land use regulations of Federal, State, and local governments may impose
special restrictions on land use or land treatment. Soil surveys identify soil
properties that are used in making various land use or land treatment decisions.
The information is intended to help the land users identify and reduce the effects of
soil limitations on various land uses. The landowner or user is responsible for
identifying and complying with existing laws and regulations.
Although soil survey information can be used for general farm, local, and wider area
planning, onsite investigation is needed to supplement this information in some
cases. Examples include soil quality assessments (http://www.nrcs.usda.gov/wps/
portal/nrcs/main/soils/health/) and certain conservation and engineering
applications. For more detailed information, contact your local USDA Service Center
(https://offices.sc.egov.usda.gov/locator/app?agency=nrcs)or your NRCS State Soil
Scientist(http://www.nres.usda.gov/wps/portal/nres/detail/soils/contactus/?
cid=nrcs142p2_053951).
Great differences in soil properties can occur within short distances. Some soils are
seasonally wet or subject to flooding. Some are too unstable to be used as a
foundation for buildings or roads. Clayey or wet soils are poorly suited to use as
septic tank absorption fields. A high water table makes a soil poorly suited to
basements or underground installations.
The National Cooperative Soil Survey is a joint effort of the United States
Department of Agriculture and other Federal agencies, State agencies including the
Agricultural Experiment Stations, and local agencies. The Natural Resources
Conservation Service (NRCS) has leadership for the Federal part of the National
Cooperative Soil Survey.
Information about soils is updated periodically. Updated information is available
through the NRCS Web Soil Survey, the site for official soil survey information.
The U.S. Department of Agriculture (USDA) prohibits discrimination in all its
programs and activities on the basis of race, color, national origin, age, disability,
and where applicable, sex, marital status, familial status, parental status, religion,
sexual orientation, genetic information, political beliefs, reprisal, or because all or a
part of an individual's income is derived from any public assistance program. (Not
all prohibited bases apply to all programs.) Persons with disabilities who require
2

alternative means for communication of program information (Braille, large print,
audiotape, etc.) should contact USDA's TARGET Center at [phone] (voice
and TDD). To file a complaint of discrimination, write to USDA, Director, Office of
Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or
call [phone] (voice)or(202) 720-6382 (TDD). USDA is an equal opportunity
provider and employer.
3

Contents
Preface 2
Soil Map 5
Soil Map 6
Legend 7
Map Unit Legend 8
Map Unit Descriptions 8
Franklin County, North Carolina 10
HeB—Helena sandy loam, 2 to 6 percent slopes 10
VaB—Vance sandy loam, 2 to 6 percent slopes 11
VnB—Varina loamy sand, 2 to 6 percent slopes 12
W—Water 13
Soil Information for All Uses 14
Soil Properties and Qualities 14
Soil Qualities and Features 14
Hydrologic Soil Group 14
References 19
4

Soil Map
The soil map section includes the soil map for the defined area of interest, a list of
soil map units on the map and extent of each map unit, and cartographic symbols
displayed on the map. Also presented are various metadata about data used to
produce the map, and a description of each soil map unit.
5

Custom Soil Resource Report
Soil Map
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3 3
Map Scale:1:3,290 if printed on A landscape(11"x 8.5")sheet. S
Meters N
0 45 90 180 270
Feet
0 150 300 m co 600 900
Map projection:Web Mercator Coer ordinates:WC584 Edge tics:UTM Zone 17N WGS84
6

Custom Soil Resource Report
MAP LEGEND MAP INFORMATION
Area of Interest(AOI) 14 Spoil Area The soil surveys that comprise your AOI were mapped at
Area of Interest(AOI) 1:24,000.
Q Stony Spot
Soilsit Very Stony Spot
Soil Map Unit Polygons Warning:Soil Map may not be valid at this scale.
Wet Spot
,..,. Soil Map Unit Lines Enlargement of maps beyond the scale of mapping can cause
p Other misunderstandingof the detail of mapping and accuracyof soil
p Soil Map Unit Points pp 9
.• Special Line Features line placement.The maps do not show the small areas of
Special Point Features contrasting soils that could have been shown at a more detailed
Blowout Water Features scale.
Streams and Canals
kg Borrow Pit
Transportation Please rely on the bar scale on each map sheet for map
* clay Spot 1.44 Rails measurements.
0 Closed Depression
o,/ Interstate Highways
Gravel Pit Source of Map: Natural Resources Conservation Service
.r US Routes Web Soil Survey URL:
Gravelly Spot Major Roads Coordinate System: Web Mercator(EPSG:3857)
® Landfill Local Roads Maps from the Web Soil Survey are based on the Web Mercator
• Lava Flow Background projection,which preserves direction and shape but distorts
distance and area.A projection that preserves area,such as the
46 Marsh or swamp Aerial Photography Albers equal-area conic projection,should be used if more
It Mine or Quarry accurate calculations of distance or area are required.
4 Miscellaneous Water This product is generated from the USDA-NRCS certified data as
O Perennial Water of the version date(s)listed below.
v Rock Outcrop Soil Survey Area: Franklin County,North Carolina
+ Saline Spot Survey Area Data: Version 26,Sep 8,2022
Sandy Spot Soil map units are labeled(as space allows)for map scales
Severely Eroded Spot 1:50,000 or larger.
• Sinkhole Date(s)aerial images were photographed: Apr 24,2022—May
31 Slide or Slip 9,2022
oa Sodic Spot 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.
7

Custom Soil Resource Report
Map Unit Legend
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
HeB Helena sandy loam,2 to 6 8.4 33.1%
percent slopes
VaB Vance sandy loam,2 to 6 10.3 40.6%
percent slopes
VnB Varina loamy sand,2 to 6 5.5 22.0%
percent slopes
W Water 1.1 4.3%
Totals for Area of Interest 25.3 100.0%
Map Unit Descriptions
The map units delineated on the detailed soil maps in a soil survey represent the
soils or miscellaneous areas in the survey area. The map unit descriptions, along
with the maps, can be used to determine the composition and properties of a unit.
A map unit delineation on a soil map represents an area dominated by one or more
major kinds of soil or miscellaneous areas. A map unit is identified and named
according to the taxonomic classification of the dominant soils. Within a taxonomic
class there are precisely defined limits for the properties of the soils. On the
landscape, however, the soils are natural phenomena, and they have the
characteristic variability of all natural phenomena. Thus, the range of some
observed properties may extend beyond the limits defined for a taxonomic class.
Areas of soils of a single taxonomic class rarely, if ever, can be mapped without
including areas of other taxonomic classes. Consequently, every map unit is made
up of the soils or miscellaneous areas for which it is named and some minor
components that belong to taxonomic classes other than those of the major soils.
Most minor soils have properties similar to those of the dominant soil or soils in the
map unit, and thus they do not affect use and management. These are called
noncontrasting, or similar, components. They may or may not be mentioned in a
particular map unit description. Other minor components, however, have properties
and behavioral characteristics divergent enough to affect use or to require different
management. These are called contrasting, or dissimilar, components. They
generally are in small areas and could not be mapped separately because of the
scale used. Some small areas of strongly contrasting soils or miscellaneous areas
are identified by a special symbol on the maps. If included in the database for a
given area, the contrasting minor components are identified in the map unit
descriptions along with some characteristics of each. A few areas of minor
components may not have been observed, and consequently they are not
mentioned in the descriptions, especially where the pattern was so complex that it
was impractical to make enough observations to identify all the soils and
miscellaneous areas on the landscape.
The presence of minor components in a map unit in no way diminishes the
usefulness or accuracy of the data. The objective of mapping is not to delineate
8

Custom Soil Resource Report
pure taxonomic classes but rather to separate the landscape into landforms or
landform segments that have similar use and management requirements. The
delineation of such segments on the map provides sufficient information for the
development of resource plans. If intensive use of small areas is planned, however,
onsite investigation is needed to define and locate the soils and miscellaneous
areas.
An identifying symbol precedes the map unit name in the map unit descriptions.
Each description includes general facts about the unit and gives important soil
properties and qualities.
Soils that have profiles that are almost alike make up a soil series. Except for
differences in texture of the surface layer, all the soils of a series have major
horizons that are similar in composition, thickness, and arrangement.
Soils of one series can differ in texture of the surface layer, slope, stoniness,
salinity, degree of erosion, and other characteristics that affect their use. On the
basis of such differences, a soil series is divided into soil phases. Most of the areas
shown on the detailed soil maps are phases of soil series. The name of a soil phase
commonly indicates a feature that affects use or management. For example, Alpha
silt loam, 0 to 2 percent slopes, is a phase of the Alpha series.
Some map units are made up of two or more major soils or miscellaneous areas.
These map units are complexes, associations, or undifferentiated groups.
A complex consists of two or more soils or miscellaneous areas in such an intricate
pattern or in such small areas that they cannot be shown separately on the maps.
The pattern and proportion of the soils or miscellaneous areas are somewhat similar
in all areas. Alpha-Beta complex, 0 to 6 percent slopes, is an example.
An association is made up of two or more geographically associated soils or
miscellaneous areas that are shown as one unit on the maps. Because of present
or anticipated uses of the map units in the survey area, it was not considered
practical or necessary to map the soils or miscellaneous areas separately. The
pattern and relative proportion of the soils or miscellaneous areas are somewhat
similar. Alpha-Beta association, 0 to 2 percent slopes, is an example.
An undifferentiated group is made up of two or more soils or miscellaneous areas
that could be mapped individually but are mapped as one unit because similar
interpretations can be made for use and management. The pattern and proportion
of the soils or miscellaneous areas in a mapped area are not uniform. An area can
be made up of only one of the major soils or miscellaneous areas, or it can be made
up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example.
Some surveys include miscellaneous areas. Such areas have little or no soil
material and support little or no vegetation. Rock outcrop is an example.
9

Custom Soil Resource Report
Franklin County, North Carolina
HeB—Helena sandy loam, 2 to 6 percent slopes
Map Unit Setting
National map unit symbol: 3s55
Elevation: 200 to 1,400 feet
Mean annual precipitation: 37 to 60 inches
Mean annual air temperature: 59 to 66 degrees F
Frost-free period: 200 to 240 days
Farmland classification: All areas are prime farmland
Map Unit Composition
Helena and similar soils: 90 percent
Minor components: 1 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Helena
Setting
Landform: Ridges
Landform position (two-dimensional): Summit, footslope
Landform position (three-dimensional): Interfluve
Down-slope shape: Concave
Across-slope shape: Concave
Parent material: Saprolite derived from granite and gneiss and/or schist
Typical profile
Ap- 0 to 8 inches: sandy loam
E- 8 to 12 inches: sandy loam
Bt- 12 to 39 inches: clay
BC-39 to 46 inches: clay loam
C-46 to 80 inches: coarse sandy loam
Properties and qualities
Slope: 2 to 6 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Moderately well drained
Runoff class: Low
Capacity of the most limiting layer to transmit water(Ksat): Moderately low to
moderately high (0.06 to 0.20 in/hr)
Depth to water table:About 18 to 30 inches
Frequency of flooding: None
Frequency of ponding: None
Available water supply, 0 to 60 inches: Moderate (about 7.6 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 2e
Hydrologic Soil Group: D
Ecological site: F136XY810SC-Acidic upland forest, seasonally wet
Hydric soil rating: No
10

Custom Soil Resource Report
Minor Components
Worsham, undrained
Percent of map unit: 1 percent
Landform: Depressions
Landform position (two-dimensional): Footslope
Down-slope shape: Concave
Across-slope shape: Concave
Hydric soil rating: Yes
VaB—Vance sandy loam, 2 to 6 percent slopes
Map Unit Setting
National map unit symbol: 3s5q
Elevation: 300 to 600 feet
Mean annual precipitation: 37 to 60 inches
Mean annual air temperature: 59 to 66 degrees F
Frost-free period: 200 to 240 days
Farmland classification: All areas are prime farmland
Map Unit Composition
Vance and similar soils: 85 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Vance
Setting
Landform: Interfluves
Landform position (two-dimensional): Summit
Landform position (three-dimensional): Interfluve
Down-slope shape: Convex
Across-slope shape: Convex
Parent material: Residuum weathered from granite and gneiss
Typical profile
Ap-0 to 8 inches: sandy loam
Bt- 8 to 30 inches: clay
BC-30 to 39 inches: sandy clay
Cl -39 to 72 inches: sandy clay loam
C2- 72 to 80 inches: sandy loam
Properties and qualities
Slope: 2 to 6 percent
Depth to restrictive feature: More than 80 inches
Drainage class:Well drained
Runoff class: Low
Capacity of the most limiting layer to transmit water(Ksat): Moderately low to
moderately high (0.06 to 0.20 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
11

Custom Soil Resource Report
Frequency of ponding: None
Available water supply, 0 to 60 inches: Moderate (about 7.6 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 2e
Hydrologic Soil Group: C
Ecological site: F136XY820GA-Acidic upland forest, moist
Hydric soil rating: No
VnB—Varina loamy sand, 2 to 6 percent slopes
Map Unit Setting
National map unit symbol: 3s5t
Elevation: 80 to 330 feet
Mean annual precipitation: 38 to 55 inches
Mean annual air temperature: 59 to 70 degrees F
Frost-free period: 210 to 265 days
Farmland classification: All areas are prime farmland
Map Unit Composition
Varina and similar soils: 85 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Varina
Setting
Landform: Broad interstream divides on marine terraces, ridges on marine
terraces
Landform position (two-dimensional): Summit, shoulder
Landform position (three-dimensional): Crest
Down-slope shape: Convex
Across-slope shape: Convex
Parent material: Loamy and clayey marine deposits
Typical profile
Ap-0 to 7 inches: loamy sand
E- 7 to 14 inches: loamy sand
Bt- 14 to 38 inches: sandy clay
Btv-38 to 57 inches: sandy clay
BC-57 to 100 inches: sandy clay loam
C- 100 to 118 inches: sandy clay loam
Properties and qualities
Slope: 2 to 6 percent
Depth to restrictive feature: 36 to 60 inches to plinthite
Drainage class:Well drained
Runoff class: Low
Capacity of the most limiting layer to transmit water(Ksat): Moderately low to
moderately high (0.06 to 0.20 in/hr)
Depth to water table:About 48 to 72 inches
Frequency of flooding: None
12

Custom Soil Resource Report
Frequency of ponding: None
Available water supply, 0 to 60 inches: Low(about 4.6 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 2e
Hydrologic Soil Group: C
Hydric soil rating: No
W—Water
Map Unit Composition
Water: 100 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Water
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 8w
Hydric soil rating: No
13

Soil Information for All Uses
Soil Properties and Qualities
The Soil Properties and Qualities section includes various soil properties and
qualities displayed as thematic maps with a summary table for the soil map units in
the selected area of interest. A single value or rating for each map unit is generated
by aggregating the interpretive ratings of individual map unit components. This
aggregation process is defined for each property or quality.
Soil Qualities and Features
Soil qualities are behavior and performance attributes that are not directly
measured, but are inferred from observations of dynamic conditions and from soil
properties. Example soil qualities include natural drainage, and frost action. Soil
features are attributes that are not directly part of the soil. Example soil features
include slope and depth to restrictive layer. These features can greatly impact the
use and management of the soil.
Hydrologic Soil Group
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.
14

Custom Soil Resource Report
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.
15

Custom Soil Resource Report
Map—Hydrologic Soil Group
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Map Scale:1:3,290 if printed on A landscape(11"x 8.5")sheet. S
71,
Meters N
0 45 90 180 270
Feet
0 150 300 m co 600 900
Map projection:Web Mercator Coer ordinates:WG584 Edge tics:UTM Zone 17N WGS84
16

Custom Soil Resource Report
MAP LEGEND MAP INFORMATION
Area of Interest(AOI) 0 C The soil surveys that comprise your AOI were mapped at
Area of Interest(AOI) CID 1:24,000.
Soils D
Soil Rating Polygons Warning:Soil Map may not be valid at this scale.
A 0 Not rated or not available
Enlargement of maps beyond the scale of mapping can cause
I Water Features
A/D misunderstanding of the detail of mapping and accuracy of soil
Streams and Canals line placement.The maps do not show the small areas of
I I B
Transportation contrasting soils that could have been shown at a more detailed
I B/D scale.
1-FF Rails
I C
^,/ Interstate Highways
C/D Please rely on the bar scale on each map sheet for map
~iv US Routes measurements.
D Major Roads
Not rated or not available Source of Map: Natural Resources Conservation Service
Local Roads Web Soil Survey URL:
Soil Rating Lines Background Coordinate System: Web Mercator(EPSG:3857)
• Ael Aerial Photography
Maps from the Web Soil Survey are based on the Web Mercator
. • A/D projection,which preserves direction and shape but distorts
• B distance and area.A projection that preserves area,such as the
Albers equal-area conic projection,should be used if more
....we B/D accurate calculations of distance or area are required.
✓ w c
This product is generated from the USDA-NRCS certified data as
• r C/D of the version date(s)listed below.
. r D
Soil Survey Area: Franklin County,North Carolina
. • Not rated or not available Survey Area Data: Version 26,Sep 8,2022
Soil Rating Points
A Soil map units are labeled(as space allows)for map scales
1:50,000 or larger.
▪ A/D
▪ B Date(s)aerial images were photographed: Apr 24,2022—May
9,2022
▪ B/D
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.
17

Custom Soil Resource Report
Table—Hydrologic Soil Group
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
HeB Helena sandy loam,2 to D 8.4 33.1%
6 percent slopes
VaB Vance sandy loam,2 to 6 C 10.3 40.6%
percent slopes
VnB Varina loamy sand,2 to 6 C 5.5 22.0%
percent slopes
W Water 1.1 4.3%
Totals for Area of Interest 25.3 100.0%
Rating Options—Hydrologic Soil Group
Aggregation Method: Dominant Condition
Component Percent Cutoff:None Specified
Tie-break Rule: Higher
18

References
American Association of State Highway and Transportation Officials (AASHTO).
2004. Standard specifications for transportation materials and methods of sampling
and testing. 24th edition.
American Society for Testing and Materials (ASTM). 2005. Standard classification of
soils for engineering purposes. ASTM Standard D2487-00.
Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of
wetlands and deep-water habitats of the United States. U.S. Fish and Wildlife
Service FWS/OBS-79/31.
Federal Register. July 13, 1994. Changes in hydric soils of the United States.
Federal Register. September 18, 2002. Hydric soils of the United States.
Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric
soils in the United States.
National Research Council. 1995. Wetlands: Characteristics and boundaries.
Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service.
U.S. Department of Agriculture Handbook 18. http://www.nres.usda.gov/wps/portal/
nres/detail/national/soils/?cid=nres 142p2_054262
Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for
making and interpreting soil surveys. 2nd edition. Natural Resources Conservation
Service, U.S. Department of Agriculture Handbook 436. http://
www.nres.usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053577
Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of
Agriculture, Natural Resources Conservation Service. http://
www.nres.usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053580
Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and
Delaware Department of Natural Resources and Environmental Control, Wetlands
Section.
United States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of
Engineers wetlands delineation manual. Waterways Experiment Station Technical
Report Y-87-1.
United States Department of Agriculture, Natural Resources Conservation Service.
National forestry manual. http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/
home/?cid=nres142p2_053374
United States Department of Agriculture, Natural Resources Conservation Service.
National range and pasture handbook. http://www.nres.usda.gov/wps/portal/nres/
detail/national/landuse/rangepasture/?cid=stelprdb1043084
19

Custom Soil Resource Report
United States Department of Agriculture, Natural Resources Conservation Service.
National soil survey handbook, title 430-VI. http://www.nres.usda.gov/wps/portal/
nres/detail/soils/scientists/?cid=nres142p2_054242
United States Department of Agriculture, Natural Resources Conservation Service.
2006. Land resource regions and major land resource areas of the United States,
the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook
296. http://www.nres.usda.gov/wps/portal/nres/detail/national/soils/?
cid=nres142p2_053624
United States Department of Agriculture, Soil Conservation Service. 1961. Land
capability classification. U.S. Department of Agriculture Handbook 210. http://
www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/nrcs142p2_052290.pdf
20