SW5220301_Stormwater Report_20220330

Stormwater
Management Report
Deliverance Church
SEA Job # 5091
Summey Engineering
Associates, PLLC
PO Box 968
Asheboro, NC 27204
Phone: [phone]
Fax: [phone]
Email: [e-mail]
L1
1
` 26447 1
►►►►1I7111119i1�1,

Deliverance Church
SEA,PLLC
Proiect Overview:
Deliverance Church will consist of a 8,056 sf place of worship located on the North side of US
Hwy 64 approximately 1,500 LF East of the intersection of Ellington Road/Stockyard Road and
Us Hwy 64 in Chatham County, Siler City, NC. The project parcel is approximately 6.61 acres
and is entirely wooded.
The soils on site are classified as Hydrologic Soil Group (HSG) D. The site does not lie within a
special flood hazard area per FIRM Panel 3710874200J. There is a perennial stream located on
site that runs from north to south through the majority of the parcel. There is also a small
intermittent stream located off of the perennial stream. There are approximately 78,649 sf of
jurisdictional wetlands on site. The entire site drains to an unnamed tributary of Blood Run
Creek, surface water classification C, that is part of the Cape Fear River Basin. See the Wetland
Delineation Report dated April 5m, 2019 for more information.
Stormwater Requirements:
This project must comply with stormwater rules set forth by the Town of Siler City, NC. The
maximum built upon area for low density is 7%. This project will have a proposed built upon
area density of 6.96% making this a low -density project per the Town of Siler City Unified
Development Ordinance Article XVI.
This project must also comply with NCDEQ stormwater quality regulations. The maximum
BUA for NCDEQ Low Density Project is 24%. The proposed BUA of 6.96% is well below the
24% BUA limit. Therefore, this project will have no permanent stormwater control measures
designed to treat for water quality or runoff attenuation.
A 100 ft buffer is required along all perennial streams and a 50 ft buffer is required along all
intermittent streams. This buffer has been provided and shown on all plan sheets. There is
approximately 381 sf of disturbance inside the stream buffer to connect the sanitary sewer
service to the existing manhole located inside the stream buffer. No impervious surfaces or
grading has been proposed inside the stream buffer.
Stormwater Treatment:
As a low -density project, no permanent stormwater control structures are proposed as a part of
this project. The project will utilize grass lined runoff conveyance channels and sheet flow to
provide water quality protection. Two permanent grass swales are located at the western
boundary of the project. The remaining runoff that does not drain to the permanent swales will
sheet flow across the proposed grass and existing wooded areas prior to leaving the site.
The project as proposed, meets all the stormwater requirements set forth by the Town of Siler
City and NCDEQ. Refer the to "Attachments" for more information.

Deliverance Church
SEA,PLLC
Attachments:
- DA-1 Existing Site Area Map
- DA-2 Proposed Site Area Map
- DA-4 Diversion Ditch Drainage Area Map
- DA-5 Roadside Ditch Drainage Area Map
- USGS Topo Map
- NRCS Hardbound Soils Map
- Hydrologic Soils Group Map
- FIRM Panel 3710874200J
- Aerial
- Diversion Ditch Calculations

1 / 1 / �//o / �l � �/t11 � /1 �W � W W �pW! W W W W W W W\ \ 1 1 L / x � � \ �•
f l �1/ ✓� l �� i \h \��"'/``�~\p] \ W W Wp v�II5*gl 0W W .4W -1"w W DRAWING LEGEND
W 1 � � \ � � ��
PERMANENT DIVERSION DITCH
jo '� l�� W W W W o L LLL DRAINAGE AREA BOUNDARY
�\\> IMPERVIOUS AREAS
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�, PpINg\
,7A.:V1iY
DIVERSION DITCH 1:
� l � > J�
S ( 1 l) 1 4�� W W W W W W Wo. \1 �� \ GRASS: 26,939 S.F. (0.62 AC)
IMPERVIOUS: 1,604 S.F. (0.04 ACC
0 �
1 "ram mi l\ TOTAL AREA: 28,543 S.F. (0.66 AC) W _
\\ C= 0.43 w= W o o U o 0
1= 7.52 z� z
)� C A= 0.66LLJ
z �'� €
DIVERSION DITCH 2:
r � GRASS: 23,430 S.F. (0.53 AC) J
M D1VER.l!.77l1ON /% I �W�W W W W ( ) I IMPERVIOUS: 12,866 S.F. (0.30 AC) � W =
3 / Dr LJ� // W W W W� v (I j \ Q Q EE
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TOTAL AREA: 36,296 S.F. (0.83 AC) V �J
_ s W W w I ` C- 0.58
1 1= 7.52
A= 0.83
DIVERSION DITCH 2
nm LLCM
�\
Plal CFS= 3.62
Om BOOK/PACE 1 ss/1o83
PUTOM/PAM' SEA Job No: �-5C91
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DRAWING SCALE
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DRAINAGE AREA BOUNDARY
IMPERVIOUS AREAS
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ROADSIDE
DITCH:
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60,327 S.F. (1.38 AC)
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16,429 S.F. (0.38 ACC
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TOTAL AREA:
76,756 S.F. (1.76 AC)
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DRAWING SCALE

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UNITED STATES
DEPARTMENT OF AGRICULTURE
' NATURAL RESOURCES CONSERVATION SERVICE
—30'00"
IF�3XLIY
CHATHAM COUN"Il', NORTH CAROLINA �
STLER CITY QUADRANGLE °
SHEET NUMBER 8OF18 tes seen
J9" 2230"
m
m
]9'30'00"
�3
This sail survey --piled by t, U.S. Depargnent of
AgriculWr,, N.—I Resources Canservatian Service and
y+asp` cooperating agencies. Base maps are orTophotagrmhs
0 prepared by the U.S. Departlnentof lhelnteriar, GedogicA
Survey, ham 19]&1399 aerial photography. Adminislra—
boundatles were acquired from the State of North Carolina
Boundaries may have been edited to cantorm uilh features
represented on the publicagon oIth0phet,graphy or 10
e hence tl�e darlty of the sdls lnformatlan.
Nortli American Datum of 1—qN AD83). GRE80 Spheroid
1000�meter gcks: Universal Transverse Mercater, zone f ]
Coordinate ggrid gcks and land division d-, if shovm, are
pprodmatdy positioned. Digital data are available for
this quadrangle.
79-27'30" ]9 26'00"
sc ALE 1:24000
MILE a caassxaws
SILER CITY, NORTH CAROLINA
7.5 MINUTE SERIES
SHEETNUMBER 8 OF 18
Soil map delineadons extending beyond the dashed
white quadrangle neatline are tar reference only and
are induded on adjacent map sheets.
e�NJ

a
ry
636010
35° 44' 14" N
35° 44' 1" N
Hydrologic Soil Group —Chatham County, North Carolina
636060 636110 636160 636210
636010 636060 636110 636160 636210
in
Map Scale: 1:2,010 if printed on A portrait (8.5" x 11") sheet.
Meters
N 0 25 50 100 150
Feet
0 50 100 200 ?00
Map projection: Web Mercator Conermordinates: WGS84 Edge tics: lfrM Zone 17N WGS84
usoA Natural Resources Web Soil Survey
Conservation Service National Cooperative Soil Survey
m
636310
0
35° 44' 14" N
0
35° 44' 1" N
636310
N
9/24/2018
Pagel of 4

Hydrologic Soil Group —Chatham County, North Carolina
MAP LEGEND
Area of Interest (AOI)
0
Area of Interest (AOI)
Soils
Soil Rating
Polygons
0
A
0
A/D
0
B
0
B/D
C
0
C/D
0
D
0
Not rated or not available
Soil Rating
Lines
r 0
A
r 0
A/D
B
B/D
N 0
C
r 0
C/D
r 0
D
r 0
Not rated or not available
Soil Rating
Points
0
A
0
A/D
0
B
0
B/D
❑ C
0 C/D
0 D
❑ Not rated or not available
Water Features
Streams and Canals
Transportation
— Rails
­0 Interstate Highways
US Routes
Major Roads
Local Roads
Background
D6 Aerial Photography
MAP INFORMATION
The soil surveys that comprise your AOI were mapped at
1:24,000.
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
line placement. The maps do not show the small areas of
contrasting soils that could have been shown at a more detailed
scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Chatham County, North Carolina
Survey Area Data: Version 20, Sep 26, 2017
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: May 19, 2015—Oct
16, 2017
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.
usoA Natural Resources Web Soil Survey 9/24/2018
Conservation Service National Cooperative Soil Survey Page 2 of 4

Hydrologic Soil Group —Chatham County, North Carolina
Hydrologic Soil Group
Map unit symbol
Map unit name
Rating
Acres in AOI
Percent of AOI
CmB
Cid-Lignum complex, 2
to 6 percent slopes
D
11.8
100.0%
GnC
Georgeville-Urban land
complex, 2 to 10
percent slopes
B
0.0
0.0%
Totals for Area of Interest
11.8
100.0%
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.
USDA Natural Resources Web Soil Survey 9/24/2018
Conservation Service National Cooperative Soil Survey Page 3 of 4

Hydrologic Soil Group —Chatham County, North Carolina
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff.- None Specified
Tie -break Rule: Higher
USDA Natural Resources Web Soil Survey 9/24/2018
Conservation Service National Cooperative Soil Survey Page 4 of 4

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FLOOD HAZARD INFORMATION
SEE FIS REPORT FORZONE DESCRIPTIONSAND INDEX MAP
THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTING
DOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT
HTTP://FRIS.NC.GOV/FRIS
-Without Base Flood Elevation (BFE)
Zone A. V, A99
With BFE or Depth sane AE, AO, are, VE, are
SPECIAL FLOOD
HAZARD AREAS — Regulatory Floodway
HAZARD
— 0.2 % Annual Chance Flood Hazard, Areas
of 1% Annual Chance Flood with Average
g
Depth LessThan One Foot orWith Drainage
Areas of Less Than One Square Mile zone x
— Future Conditions 1% Annual
Chance Flood Hazard zone x
OTHER AREAS OF — Area with Reduced Flood Risk due to Levee
FLOOD HAZARD See Notes Zane x
OTHER — Areas Determined to be Outside the
AREAS 0.2% Annual Chance Floodplain 2onex
Channel, Culvert, or Storm Sewer
Accredited or Provisionally Accredited
GENERAL Levee, Dike, or Floodwall
STRUCTURES . . . . . . . . . . . . . Non -accredited Levee, Dike, or Floodwall
BM5510, North Carolina Geodetic Su rvey bench mark
BM55100 National Geodetic Survey bench mark
BM5510
'�> Contractor Est. NCFMP Survey bench mark
o�ra.z— Cross Sections with 1% Annual Chance
Water Su rface Elevation (BFE)
s8) - - - - - Coastal Transect
------- Coastal Transect Baseline
Profile Baseline
Hydrographic Feature
OTHER Limit of Study
FEATURES Jurisdiction Boundary
NOTES TO USERS
For Information Intl a s'boutthls ma vallable rotlucts a 'tetl with Ibis FlRM:,Illdin q e p,' p g
hlsmbc versbns Of mis FIRM h0wm Omer r0tluc[s Orme N'e0n'I rloga msw'nce," a eaI
please all me FEMA Map Inf—t , eXch'nge at 1-e]]-FEMA -MAP (1-e77-336-2627) orrvlsitthd FEMA Map
Service Center web sib at htgh.//msc fem'.gmv. An'ceomp'nying Fbotl Insuance St tly report, Letter of Map
Revision (LOMR) or Letter of Map Amentlment (LOMA) revising DID1111 of this panel, Intl tliglbl versions of this
FIRM may be available. Visit the North Carolina FlootlplainMapping Program websib at Utp//www.ncfbotlm con
or cenbc[ the FEMA Map Service Center.
Communites annexing lantl on atljacent FIRM panels must obb,, a current copy of the atljacent panel as well as
the curent FIRM Index. These may be o,db,bd tlirecty fmm the Map Service Center atthe number Ilsbtl above.
For community Ina aunn,,wme map tl'td, referb me Flootl bsuance SNtly ap0rtbrmisjuhstlld0n.
TI tleb-,,b If flootl bsuance Is'v'o'be In be 10mmu11ty, contaetylur bsuance agent 01 at me N't0n'I
Flootl Insuance Pmgam at 1-800-638 6620.
Base map Inmrnaton shown on this FIRM was pmvitletl In tligibl format by the North C'mlln' Flootlplain
Mapping Pmgam(NCFMP). The source of this Inm 3t,an be tlebrminetl f,m the metatlab'vallable In me
tliglbl FLOOD tlatabase Intl In the Tech31 Support Dab Notebook TARN).
ACCREDITED LEVEE NOTES TO USERS. If'n'ccretllbtl Ievee note appears on thls panel chb,kwltlh your baI
iuuY b of cha h tllevlfp pm tltl(Hh yexceetlthe
permce h eI p tl E g'' A PI on h v (,) h p ,ding pmbcron.
To m[g fl tl k restl I k ,Amp rty ntl Itl ce g tl tlerflootl
111,311, tlfl tlp ofing h p ctiv .Fro f nfl tl I,tb,b,tbd
p'rtes h Itl h FEMA-b UDIP1 vw f g v/bu g fpl,tl dhtm
PROVISIONALLY ACCREDITED LEVEE NOTES TO USERS If P d IIyAm tlL (PAL)n,tb
appears on this panel, check with your IOaI community m obt- more Information, such as the estm'tetl level of
Ipmtectln pmvitletl (which may exceed be 1_peaent-annua3chance level)— Emergen Action Plan, on the
ees,,lemlk shown 3s pmvting pmtecto, Tom'bbin'ccatll't0n, me levee owner or community Is
levee
b submit the tlata Intl tlocome-bb, necessary b comply with the
65.10 of the NFIP regN3tons.
If me toh""ty 0'
owner does not provme the nece—, tlata Intl tlocumenbeon or If the tlata Intl tlocumenbeon
pmvitletl Indc3tes the levee "tem doe, not comply with Section 65.10 requirement,, FEMA will revise the flood
hazard Intl risk Inmmaton for this area to reflect de 3—etlibton of the levee ry,tem. To mitg'te flood risk In
R' dual risk areas, pmpehy ownea Intl resment— encouaged b considereuutl bsuance Intl fioodpmoeng
r other protective measures. For more IU-3ton on flood Insuance, Interesbtl p'rtesshoultl visit the FEMA
Website at ht[p://.fema g0v/busines U,/rode-shim
LIMIT OF MODERATE WIVE ACTION NOTES TO USERS Forsome coasblFlood, zonesthe AE Zone
ategory has been tllvitletl by a Limit of Modeate Wave Action (LiM WA). The LiM WA represent, the appmma bte
3ndwa limit of the 15-foot breaking wave. The effects of wave h3z3,d, between the VE Zone Intl the LiM W1
(or between De shoreline Intl the LIM W1 for areas where VE Zones are not,dentified) will be smilar b, but less
seven than those In the VE Zone.
Limit of Moderate Wave Action (LiMWA)
COASTAL BARRIER RESOURCES SYSTEM (CBRS) NOTE
This map may —elude approximate houndd-,0fthe CBRS fo—f0mabonal purposes only. Flood Insuance is not
mg'o'be w¢hb CBRS areas to, tub e, matare newly hoot orsub,bnt,blly Improved on o, dDe, me dbte(s)
l,ted 0n the nap. Fur more lnbmat0n see hbp>/www rwsg0vm'bIb[c0nsem't0n/c0'sbI b'merhmn, he
FIS Report, or all heUS. Fish Intl VNltllife Service Customer Service Center at 1-800-344WILD
.
® CBRS Area 0 Otherwise Protected Area
SCALE
eMao
A ra State Plane Proection
Northh Ca.ollinin
Feet Zone 3200
Datum. PAD 1983 Horizontal
NAVD 1988 Vertical
1 inch = 1,000 feet
1:12,000
0 500 1,000
2,000
Feet
Meters
0 150 300
600
PANEL
LOCATOR
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I i
ORANGE COUNTY
I i DURHpM COUNTY
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NORTH CAROLINA FLOODPLAIN MAPPING PROGRAM
NATIONAL FLOOD INSURANCE PROGRAM
'_OOD INSURANCE RATE MAP
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COMMUNITY CID PANEL SUFFIX
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CHATHAM COUNTY 3]0299 8742 ..
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MAP NUMBER
3710874200J
'*a...� MAP REVISED
02/02/07

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9/7/22, 1:10 PM
ECMDS 7.0
NORTH
AMERICAN
GREEN
CHANNEL ANALYSIS
> > > Diversion 1
Name
Diversion 1
Discharge
2.13
Channel Slope
0.01
Channel Bottom Width
2
Left Side Slope
3
Right Side Slope
3
Low Flow Liner
Retardence Class
C 6-12 in
Vegetation Type
None
Vegetation Density
None
Soil Type
Clay Loam (CL)
North American Green
5401 St. Wendel-Cynthiana Rd.
Poseyville, Indiana 47633
Tel. [phone]
>Fax [phone]
www.nagreen.com
ECMDS v7.0
S150
Normal Permissible Calculated Safety Staple
Phase Reach Discharge Velocity Depth 1ManningsNj'
Shear Stress Shear Stress Factor Remarks Pattern
S150 Straight 2.13 cfs 1.29 ft/s 0.48 ft 0.055 1.8 Ibs/ft2 0.3 Ibs/ft2 6.01 STABLE D
Unvegetated
Underlying Straight 2.13 cfs 1.29 ft/s 0.48 ft 0.055 1.96 Ibs/ft2 0.2 Ibs/ft2 9.59 STABLE D
Substrate
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https://ecmds. com/project/148635/chan nel-analysis/206226/show# 1 /1

9/7/22, 1:09 PM
NORTH
AMERICAN
GREEN
CHANNEL ANALYSIS
> > > Diversion 2
ECMDS 7.0
North American Green
5401 St. Wendel-Cynthiana Rd.
Poseyville, Indiana 47633
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www.nagreen.com
ECMDS v7.0
Name
Diversion 2
Discharge
3.62
Channel Slope
0.01
Channel Bottom Width 2
Left Side Slope
3
Right Side Slope
3
Low Flow Liner
Retardence Class C 6-12 in
Vegetation Type
None
Vegetation Density None
Soil Type
Clay Loam (CL)
S150
Phase
FReach
I Discharge
Velocity
Normal
Mannings N
Permissible
Calculated
Safety
Remarks
Staple
Depth
Shear Stress
Shear Stress
Factor
Pattern
S150
Straight 3.62 cfs 1.55 ft/s
0.61 ft
0.052 1.8 Ibs/ft2
0.38 Ibs/ft2
4.73
STABLE D
Unvegetated
Underlying
Straight 3.62 cfs 1.55 ft/s
0.61 ft
0.052 1.96 Ibs/ft2
0.25 Ibs/ft2
7.89
STABLE D
Substrate
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SEAL -
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https://ecmds.com/project/148635/channel-analysis/206248/show 1 /1