SW5191001_E&SC Report_20200420

Erosion Control
Report
22 Davie LLC
SEA Job # 5885
Summey Engineering
Associates, PLLC
PO Box 968
Asheboro,NC 27204
Phone: [phone]
Fax: [phone]
Email: [e-mail]
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22 Davie LLC
SEA,PLLC
Project Overview:
22 Davie LLC will consist of a 22,000 sf manufacturing site and warehouse located at 1217
Harold Andrews Rd approximately 1.1 miles northeast of the intersection of Old Us 421 and
Harold Andrews Road in Chatham County, Siler City,NC. The project parcel is approximately
13.56 acres and is almost entirely wooded. The facility will produce tile and tile like flooring
materials to be used in construction. The company"Floorazoo"has an existing facility in
downtown Siler City along W. 3rd Street and intends to move the operation to the project site and
continue their production at the new facility.
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 3710876200K. There is an intermittent stream located
on site,per USGS Topo maps that runs from southwest to northeast across the western portion of
the parcel. There are no jurisdictional wetlands on site. The entire site drains to an unnamed
tributary of Rocky Rover, surface water classification C, that is part of the Cape Fear River
Basin.
Erosion Control:
All devices for this project have been sized to provide adequate protection from the runoff of the
10-year storm.
The majority of the site will be treated by two sediment basins, one located to the northern
boundary of the project limits and one located at the southern boundary of the project limits. The
remainder of the site will be treated by silt fence with silt fence stone outlets, temporary rock
check dams and rock inlet protection. The entire disturbed area for this project will be
approximately 5.0 acres.
One temporary diversion ditch and two permanent grass lined ditches will be installed to ensure
the majority of the disturbed will drain to the skimmer basins. Temporary rock check dams have
been provided in the temporary and permanent diversions.
The remaining disturbed area located outside of the drainage area to the temporary diversions,
and two sediment basins will be treated by silt fence and silt fence stone outlets. Geotextile
fabric has been provided where the temporary diversion empties into sediment basin#1 and at
sediment basin spillways.
All diversion ditches will be matted and stabilized within 7 days following installation. Rip rap
aprons have been provided at the driveway pipe outlet and has been sized for the 10-year storm.
After the site is completely stabilized all temporary erosion control measures will be removed. A
total of 86,719 sf of impervious area has been proposed as a part of this project. The BUA
density as proposed will be 6.69% classifying this as a low-density stormwater project per
NCDEQ standards but will require peak runoff attenuation per Siler City Local Ordinances.
Refer to the "Attachments" for further information.

22 Davie LLC
SEA,PLLC
Attachments:
- EC-1 Phase 1 —Sediment Basin Drainage Area Map
- EC-2 Phase 2— Sediment Basin Drainage Area Map
- EC-3 Diversion Ditch Drainage Area Map
- EC-4 Driveway Pipe Drainage Area Map
- USGS Topo Map
- NRCS Hardbound Soils Map
- Hydrologic Soils Group Map
- FIRM Panel 3710874200J
- Aerial
- NOAA IDF—Intensity
- Skimmer Basin Sizing Calculations
- Skimmer Sizing Calculations
- Open Channel Flow Calculations
- Rip Rap Apron Sizing Calculations

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/ / / / I I TOTAL AREA : 43,816 SF (1.00 AC)
/ / / \ \ / c / IMPERVIOUS AREA : 19,357 SF (0.44 AC) (C=0.9) U
f�' / //// / / // / GRASS: 21,708 SF (0.56 AC) (C=0.2)
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/ / ` / IMPERVIOUS AREA 25,424 SF (0.58 AC) (C=0.9) v� Q �o
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TOTAL AREA : 32,638 SF (0.75 AC)
u / ( t / IMPERVIOUS AREA : 8,296 SF (0.19 AC) (C=0.9)
/ / I 1 / GRASS 24,342 SF (0.56 AC) (C=0.2) SEA Job No: -5885
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�_� I ,G�` / /// IMPERVIOUS AREA : 782 SF (0.02 AC) (C=0.9)
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UNITED STATES CHATHAM COUNTY,NORTH CAROLINA
DEPARTMENT OF AGRICULTURE CRUTCHFIELD CROSSROADS QUADRANGLE
030 , ,,,. .pl,.,.' . ''.1.141.' - .
NATURAL RESOURCES CONSERVATION SERVICE SHEET NUMBER 2 OF 18
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)� ope ling ge Base maps tlhophotographs a , CRUTCHFIELD CROSSROADS,NORTH CAROLINA,'
prepared byt he US.Department of the Interior,Geological
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1860000 FEET 1870000 FEET
This digital Flood Insurance Rate Map(FIRM)was produced trough a unique
cooperative partnership between the State of North Carolina anti the Federal
Emergency Management Agency(FEMA). The Stale of North Carolina has
implemented a long term approach to fbodplain management to decrease the
costs associatetl with flooding.This is demonstrated by the State's commitment
to map flood hazard areas at the local level.Asa pert of this effort,the Stale of
North coml.has jot.In a Cooperating Technical State agreement wit
FEMA to produce and maintain this digital FIRM.
FLOOD HAZARD INFORMATION NOTES TO USERS SCALE
SEE FIS REPORT FOR ZONE DESCRIPTIONS AND INDEX MAP NORTH CAROLINA FLOODPLAIN MAPPING PROGRAM
For information and questions about this map,avallable products associated with this FIRM including Map Projection:
E NATIONAL FLOOD INSURANCE PROGRAM
THE INFORMATION DEPICTED ON THIS MAP AND SUPPORTING hislodc versions of this FIRM,how to omen products or the National Flood Insurance Program In general, North Carolina Stale PlaO¢Pr Projection Feet Z00¢ A.I��
please call the FEMA Map InformalpneXchange at 1-877-FEMA-MAP(1-877336-2827)or visit the FEMA Map e ) ( 3200) `V '- 000 INSURANCE RATE MAP
DOCUMENTATION ARE ALSO AVAILABLE IN DIGITAL FORMAT AT Service Contemn....at http9/mse fema.go¢An accompanying Flood Insurance study report,Letter of Map Datum:NA01983(Horizontal),NAVD 1988(Vertical)
Revision(LOMR)or Letter of Map Amendment(LOMA)revising portions of this panel,and dIgnal versions of Nis
HTTP://FRIS,NC,GOV/FRIS FIRM may be available.Vlsil the North Carolina FlootlplainMappingProgramwebsiteathup:/hvww.ncflo0dmaps.cons 'o NORTH CAROLINA s,,grCantanNeFEMAMapServiceCe er. 1meh=S00feet 1:8,000 `Without Base Flood Elevation(B FE) Communities annexing land on adjacent FIRM panelsYust obtain a current Copy of Me adjacent panel as well as 0 250 500 1,000 1 © PANEL 762 �FithBZone A,V,rD [he current FIRM Index.These maY be omered direcd from floe MaP Service Center alNe numberlisletl above. CL 1 .i, -'
With BFE or Depth zone AE,AD,Al-I,VE,AR Feet
For co unity and countywide map d.s refer to the Flood Insurance Study report for N is jurisdiction.
SPECIAL FLOOD Meters CD
Regulatory Medway To determine if flood insurance is available m Me community,contact your Insurance agent or call the Natonal 0 75 150 300 Ir.�
HAZARD AREAS Flood Insurance Program at 1-800-638-6620, lr I^I
0.2%Annual Chance Flood Hazard,Areas Flood Insurance SNdy(FIS)means an examinalion,evaluation,and tlelerm1,etion offload f000,ds,comesporging
waterawfaceelevanon&noodhaza,499kzones,00doNerfooddetamacommunirymsuedbyte NorthCamlina PANEL LOCATOR Panel Contains:
oft%Annual Chance Flood with Average Floodplain Mappng Program(NCFMP).The Flood insurance Study(FIS)rs comprised of the following products ,.
usetl together:the Digital Flood Hazard Database,the Water Surface Elevation Rasters,the digitally delved,
Depth Less Than One Foot or With Drainage amq dFloodInsuranceR.MapandtheFloodInsuranceSurve Report. COMMUNITY CID PANEL SUFFIX
generate y Survey is
Areas of Less Than One Square Mile Zone X compllallonantlpresenlationotfloodnsktlaNforspecMcwatercourses,lakes,andcoestalflootlM1azardareaswlNin SILERCITV,TOWNOF 370058 8762 K
munfly.This report contains tie 18,,c Aced elevation data,data tables anti FIRM Indices.When a flood.6.Is
Future Conditions 1%Annual completed for the NEW,,the digital information,reports and maps are assembled Into an FIS.Information shown on
this FIRM Is provided In digital format by the NCFMP.Base map Information shown on Nls FIRM was provided In .,,ford
Chance Flood Hazard Zone x digital format by the NCFMP.The source of this Information can be determined from the metadata available In the Orange Durham
OTHER AREAS OF digital FLOOD database ant In the Technical Support Data Notebook— (TSDN). Alamance Area with Reduced Flood Risk due to Levee
FLOOD HAZARD ACCREDITED LEVEE NOTES TO USERS:If an accredited levee note appears on this panel check with your beat .. ...41.
See Notes zone x community to obtain more intonation,such as the estimated level of protection pmvltletl(which may exceed the Ranmalph g]3g}3J�,,�� 9]67 0717 can /�
OTHER lyercentannualchance level)and Emergency Action Plan,on the levee system(s)shown as providing protection. 8746 8766 e78slsr9s,w.0619a 97I: _"5'46• 976s 9ns9 60r0s Bns V
-Areas Determined to be Outside the To mitigate flood risk m residual risk areas,property owners and residents are encouraged to consider flood
AREAS 0.2%Annual Chance Floodplain zone x insurance and floodprOONg or other protective measures.For more information on flood insurance,interested
697259ia59]45 W559]659n5 7e6 7
parties should visit the FEMA Webege at Mtp:/Avwwfema.gov.uslnesslnfiphndex.shtm. leelL
Channel,Culvert,or Storm Sewer PROVISIONALLY ACCREDITED LEVEE NOTES TO USERS:If aProvisionall AccredlledLevee(PAL)note 8]24 8]44 8164 g]84 9704 9794 0704
Y 9724 9734 9744 97.97.9774 p724
Accredited or Provisionally Accredited appears onNiapaneL check wiNyour gcalwmmunirytoobtain more fnformadEro75 asNeeatlmaled level of ( 1I
protection provided(witch may exceed the 1-percentannual-charwe level)and Emergency Action Plan,on the 8763 8773 9743 9753 9763 9773 0703 071 CO
GENERAL Levee,Dike,or Floodwall leveesystem(s)shown as providing protection.To maintain accreditation,the levee owner 0r community is 8]22 8,42 W82 W02 9722 9782 I�
required to submit the data and documentation necessary b comply wit Section 65.10 of the NFIP regulations. g772 9742 9752 9762 9772 0702 07 2
STRUCTURES r,,r,r r,r,rr, Non-accredited Levee,Dike,or Floodwall If the community or owner does not provide the necessary data and documentation or 8 the data and docume lion
provided Indicates Ne levee system does not comply with Section 65.10 requirements,FEMA will revise the flood 8741 8751 8761 8771 9721 9731 9741 9751 9761 9771 07010 1
BM5510X North Carolina Geodetic Survey bench mark hazaManddakiar0rmal,nor Ohisarearestee[tle-aareditatg oftc'i:n ear VZmTomitigateno0drlsk In 8720 W80 W00 W80 }4
esdual dskareas,property ownersaM residerlsere ercouregetlbconsitlerfloetlinsurance antifloedprooflng 8,40875087fi08770 97209730 9740 97509760 9770 0,00 710
BM5510® National Geodetic Survey bench mark or other protectne measures.For more information on food insurance,interested partes should yst the FEMA Wke
CC
Websne at Mtp://www fame.gov/W 9�siness/nflp/Index.shtm. 996799689969
BM551 0 Contractor Est.NCFMP Survey bench mark eeos 8648 8668 8688 sees goes 9E48 6g
® LIMIT OF MODERATE WAVE ACTION NOTES TO USERS:For Some coastal flooding zones the AE Zone 9668 9678 9688 969
01 Cross Sections with 1%Annual Chance category has been divided by a Limit of Moderate Wave Action(LIMWA).The LIMWA represents the approximate /—
landward limit of the 1.5-foot breaking wave.The effects of wave hazards between the VE Zone and the LIMWA 9647 9657 ..687 9697
Water Surface Elevation(BFE) (or betweenthe shoreline and the LIMWAfor areas where VE Zones am not identified)wlllbe similar to,brit less 8626 canoe n, 8666 8686 9606 962 —lox— 9666 06 0626
severe than Nose In the VE Zone.
d Coastal Transect �00 oes 'B 969
8685 86951,515 9625 95
CoastalTransectBaselioe Limit of Moderate Wave Action(LiMWA) 8624 8644 8664 .11684p6941604 9 614 4 0624
__— 9 VERSION NUMBER
COASTAL BARRIER RESOURCES SYSTEM(CBRS)NOTE Lee 2.3.3.2
—- Profile Baseline This map may include approximate boundaries of the CBRS for informational purposes only.Flood tosurance Is not MAP NUMBER
available within CBRS areas for structures Nat are newly built or substantially improved on or after thedate(s) Moore Harnett 3710876200K
Hydrographic Feature Indicated on the map.For mereinfornationseebflp://w,wifws.gov/cbra,theFlSReport,orcalltheU.S.Fish I
and Wildlife Service Customer Service Center at 1-800344-WILD.
D
OTHER Limit of Study \\\\\y CBRS Area I� r 17,20P E7
L.:. Otherwise Protected Area November17,2017
FEATURES Jurisdiction Boundary

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NOAA Atlas 14,Volume 2,Version 3
€„ Location name:Slier City,North Carolina,USA* y
?p Latitude:35.7239°,Longitude: -79.4625° r 101lA
Elevation:606.59 ft** i
*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/hour)1 _
Average recurrence interval(years)
Duration -
1 2 5 10 25 50 100 200 500 1000
--
5-min 5.00 5.94 6.88 7.52 8.23 I8.70 9.11 9.46 9.82 10.1
(4.57-5.48) (5.42-6.52) (6.28-7.55) (6.86-8.24) (7.46-9.01) (7.86-9.52) (8.20-9.97) (8.46-10.4) (8.70-10.8) (8.83-11.0)
10-mini 4.00 4.75 5.51 6.02 6.56 6.93 7.24 7.49 7.76 7.92
i (3.65-4.39) i (4.34-5.21) (5.03-6.05) (5.48-6.59) (5.95-7.18) 1 (6.26-7.58) I (6.51-7.92) (6.70-8.21) (6.88-8.50) (6.96-8.68)
15-min 3.33 3.98 4.65 5.08 5.55 5.85 6.10 6.30 6.51 6.62
(3.04-3.65) _(3.64-4.36) (4.24-5.10) (4.62-5.56)_ (5.03-6.07) (5.28-6.40) (5.48-6.68) (5.64-6.90) (5.77-7.13) (5.82-7.26)
30-min 2.28 2.75 3.30 3.68 4.11 4.40 4.67 4.90 5.18 5.36
(2.09-2.50) (2.51-3.01) (3.01-3.62) (3.35-4.03) (3.72-4.49) (3.98-4.82) (4.20-5.11) (4.39-5.37) (4.59-5.67) (4.71-5.88)
60 min 1.42 1.72 2.12 2.40 2.74 2.98 3.22 3.44 3.72 3.92
1 (1.30-1.56) (1.58-1.89) (1.93-2.32) (2.18-2.62) (2.48-2.99) (2.70-3.27) (2.89-3.52) (3.08-3.77) (3.29-4.07) (3.44-4.29)
2-hr 0.853 1.03 1.28 1.46 1.69 1.86 2.03 2.19 2.40 I 2.56
(0.778-0.940) (0.944-1.14) (1.17-1.41) (1.33-1.61) (1.53-1.86) (1.67-2.05) (1.81-2.23) (1.94-2.41) (2.11-2.65) (2.23-2.83)
3-hr 0.606 0.736 0.915 1.05 1.22 1.36 1.49 1.62 1.80 1.94
(0.554-0.667) (0.674-0.810) (0.835-1.01) (0.955-1.15) (1.11-1.34) (1.22-1.49) (1.33-1.63) (1.44-1.78) (1.57-1.97) (1.67-2.13)
6-hr 0.366 0.443 0.551 0.634 0.744 0.830 0.917 1.01 1.13 1.22
(0.336-0.401) (0.407-0.486) (0.504-0.604) (0.578-0.693) (0.674-0.811) (0.746-0.905) (0.818-0.999) (0.888-1.10) (0.980-1.23) (1.05-1.33)
12-hr 0.216 0.261 0.326 0.378 0.448 0.504 0.562 0.623 0.707 0.774
(0.198-0.236) (0.240-0.286) (0.299-0.358) (0.345-0.414) (0.405-0.488) (0.452-0.548) (0.499-0.610) (0.547-0.675) (0.610-0.766)I(0.657-0.840)
24-hr 0.125 0.150 0.188 0.218 0.258 0.290 1 0.322 0.356 0.402 I 0.439
(0.116-0.134) (0.141-0.161) (0.176-0.202) (0.203-0.234) (0.240-0.277) (0.269-0.311) (0.298-0.347) (0.328-0.383) (0.369-0.434),(0.400-0.474)
2-day 0.073 0.088 0.109 0.126 0.148 0.166 0.184 0.202 0.228 0.248
(0.068-0.078) (0.082-0.094) (0.102-0.117) (0.118-0.135) (0.138-0.159) (0.154-0.178) (0.170-0.198) (0.186-0.218) (0.209-0.246) (0.226-0.268)
3-day 0.052 0.062 0.077 0.088 0.104 0.116 0.129 0.142 0.160 0.174
(0.048-0.055) (0.058-0.067) (0.072-0.082) (0.082-0.095) (0.097-0.111) (0.108-0.125) (0.119-0.138) (0.131-0.153) (0.146-0.172) (0.158-0.188)
4-day 0.041 I 0.049 0.061 0.070 0.082 I 0.091 0.101 0.112 0.126 0.137
(0.038-0.044) (0.046-0.053) (0.057-0.065) (0.065-0.074)1(0.076-0.088) (0.085-0.098) (0.094-0.109) (0.103-0.120) (0.115-0.135) (0.124-0.147)
7-day 0.027 0.032 0.039 0.045 0.052 0.058 0.064 0.071 0.079 0.086
(0.025-0.029) (0.030-0.034) (0.037-0.042) (0.042-0.048) (0.049-0.056) (0.054-0.062) (0.060-0.069) (0.065-0.076) (0.073-0.085) (0.079-0.093)
10-day 0.021 0.026 0.031 0.035 0.040 0.044 0.049 0.053 0.059 0.064
(0.020-0.023) (0.024-0.027) (0.029-0.033) (0.033-0.037) (0.038-0.043) (0.041-0.047) (0.045-0.052) (0.049-0.057) (0.055-0.063) (0.059-0.069)
0.014 0.017 0.020 0.023 0.026 0.028 0.031 0.034 0.037 0.040
10-day
(0.014-0.015) (0.016-0.018) (0.019-0.021) (0.021-0.024) (0.024-0.027) (0.027-0.030) (0.029-0.033) (0.031-0.036) (0.035-0.040) (0.037-0.043)
30-day 0.012 0.014 0.016 0.018 0.020 0.022 0.024 0.026 0.028 0.030
(0.011-0.013) (0.013-0.015) (0.015-0.017) (0.017-0.019) (0.019-0.021) (0.021-0.023) (0.023-0.025) (0.024-0.027) (0.026-0.030) (0.028-0.032)
45-day 0.010 0.012 0.014 0.015 0.017 0.018 0.019 0.020 0.022 0.023
(0.010-0.011) (0.011-0.012) (0.013-0.014) (0.014-0.016) (0.016-0.017) (0.017-0.019) (0.018-0.020) (0.019-0.022) (0.021-0.023) (0.022-0.025)
60-day 0.009 0.011 0.012 0.013 0.014 0.015 0.016 0.017 0.019 0.020
(0.009-0.010) (0.010-0.011) (0.011-0.013) (0.012-0.014) (0.014-0.015) (0.015-0.016) (0.016-0.017) (0.016-0.018) (0.018-0.020) (0.018-0.021)
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

Summey Engineering Associates, PLLC
Engineering - Land Planning - Consulting
P.O. Box 968 -Asheboro NC 27203
Phone - 336-328-0922 Fax: [phone]
TEMPORARY SKIMMER BASIN CALCULATIONS
PROJECT INFORMATION
Job No: E-5885
Job Description: Basic Machinery
Job Location:
Siler City, NC
Owner:
Address:
Temporary Skimmer Basir 1 - Phase 1
DESIGN DATA Skimmer
Runoff Coefficient ( C ) = 0.5
Intensity ( I ) = 7.52 IN./HR. 10 Year Storm
Drainage Area ( A ) = 1.31 AC.
Disturbed Area = 1.31 AC.
Impervious Area = 0
Peak Inflow ( Q=CIA ) = 4.9256 C.F.S.
DIMENSIONS REQUIRED
Surface Area Required = 1601 S.F. 325 S.F. / Peak Flow
Volume Required = 2358 C.F. 1800 C.F. / Dist. Acre
DIMENSIONS PROVIDED
Basin Size:
Elevation Area (SF) Storage (CF)
Surface Area Provided: 1800 S.F. OK 616 864
Volume Provided: 2628 C.F. OK 616 864 0
617 1296 1080
618.00 1800 1548
Total Storage 2628

Summey Engineering Associates, PLLC
Engineering - Land Planning - Consulting
P.O. Box 968 -Asheboro NC 27203
Phone - 336-328-0922 Fax: [phone]
TEMPORARY SKIMMER BASIN CALCULATIONS
PROJECT INFORMATION
Job No: E-5885
Job Description: Basic Machinery
Job Location:
Siler City, NC
Owner:
Address:
Temporary Skimmer Basir 2 - Phase 1
DESIGN DATA Skimmer
Runoff Coefficient ( C ) = 0.5
Intensity ( I ) = 7.52 IN./HR. 10 Year Storm
Drainage Area ( A ) = 2.04 AC.
Disturbed Area = 2.04 AC.
Impervious Area = 0
Peak Inflow ( Q=CIA ) = 7.6704 C.F.S.
DIMENSIONS REQUIRED
Surface Area Required = 2493 S.F. 325 S.F. / Peak Flow
Volume Required = 3672 C.F. 1800 C.F. / Dist. Acre
DIMENSIONS PROVIDED
Basin Size:
Elevation Area (SF) Storage (CF)
Surface Area Provided: 4474 S.F. OK 617.5 2731
Volume Provided: 7169 C.F. OK 617.5 2731 0
618.5 3566 3149
619.50 4474 4020
Total Storage 7169

Summey Engineering Associates, PLLC
Engineering - Land Planning - Consulting
P.O. Box 968 -Asheboro NC 27203
Phone - 336-328-0922 Fax: [phone]
TEMPORARY SKIMMER BASIN CALCULATIONS
PROJECT INFORMATION
Job No: E-5885
Job Description: Basic Machinery
Job Location:
Siler City, NC
Owner:
Address:
Temporary Skimmer Basir 1 - Phase 2
DESIGN DATA Skimmer
Runoff Coefficient ( C ) = 0.5655
Intensity ( I ) = 7.52 IN./HR. 10 Year Storm
Drainage Area ( A ) = 1.16 AC.
Disturbed Area = 0.97 AC.
Impervious Area = 0.19
Peak Inflow ( Q=CIA ) = 4.9331 C.F.S.
DIMENSIONS REQUIRED
Surface Area Required = 1603 S.F. 325 S.F. / Peak Flow
Volume Required = 1746 C.F. 1800 C.F. / Dist. Acre
DIMENSIONS PROVIDED
Basin Size:
Elevation Area (SF) Storage (CF)
Surface Area Provided: 1800 S.F. OK 616 864
Volume Provided: 2628 C.F. OK 616 864 0
617 1296 1080
618.00 1800 1548
Total Storage 2628

Summey Engineering Associates, PLLC
Engineering - Land Planning - Consulting
P.O. Box 968 -Asheboro NC 27203
Phone - 336-328-0922 Fax: [phone]
TEMPORARY SKIMMER BASIN CALCULATIONS
PROJECT INFORMATION
Job No: E-5885
Job Description: Basic Machinery
Job Location:
Siler City, NC
Owner:
Address:
Temporary Skimmer Basir 2 - Phase 2
DESIGN DATA Skimmer
Runoff Coefficient ( C ) = 0.6904
Intensity ( I ) = 7.52 IN./HR. 10 Year Storm
Drainage Area ( A ) = 2.29 AC.
Disturbed Area = 1.2 AC.
Impervious Area = 1.09
Peak Inflow ( Q=CIA ) = 11.889 C.F.S.
DIMENSIONS REQUIRED
Surface Area Required = 3864 S.F. 325 S.F. / Peak Flow
Volume Required = 2160 C.F. 1800 C.F. / Dist. Acre
DIMENSIONS PROVIDED
Basin Size:
Elevation Area (SF) Storage (CF)
Surface Area Provided: 4474 S.F. OK 617.5 2731
Volume Provided: 7169 C.F. OK 617.5 2731 0
618.5 3566 3149
619.50 4474 4020
Total Storage 7169

Skimmer Basin #1
Calculate Skimmer Size
Basin Volume in Cubic Feet 2,358 Cu.Ft Skimmer Size 1.5 Inch
Days to Drain* 3 Days Orifice Radius 0.5 Inch[es]
Orifice Diameter 1.0 Inch[es]
*In NC assume 3 days to drain
Estimate Volume of Basin Length Width
Top of water surface in feet 0 0 Feet VOLUME 0 Cu. Ft.
Bottom dimensions in feet 0 0 Feet
Depth in feet 0 Feet

Skimmer Basin #2
Calculate Skimmer Size
Basin Volume in Cubic Feet 3,672 Cu.Ft Skimmer Size 1.5 Inch
Days to Drain* 3 Days Orifice Radius 0.6 Inch[es]
Orifice Diameter 1.3 Inch[es]
*In NC assume 3 days to drain
Estimate Volume of Basin Length Width
Top of water surface in feet 0 0 Feet VOLUME 0 Cu. Ft.
Bottom dimensions in feet 0 0 Feet
Depth in feet 0 Feet

Summey Engineering Associates, PLLC
Project: Basic Machinery
Job Number: E-5885
Channel Flow Equations
Temporary Ditch 1- Phase 1
Hydraulic Radius R=A/Pw 0.643462
Area A= 6 sf
Wetted Perimeter Pw= 9.324555 ft
Channel Slope S = 0.0238 ft/ft
Mannings Coeff. n = 0.02
Trapazoidal Ditch
Bottom Width 3 ft
Side Slope 3 :1
Top Width 9 ft
Depth 1 ft
Manning Equation
Q= (1.49/n)*A*R2/3*S1/2
Q= 51.40 cfs (Ditch Maximum)
Drainage Area
Type Area (AC) C
Bare Earth 0.75 0.5
Impervious 0.00 0.9
Q =CIA
C 0.50
I 7.52 in/hr (10 yr-5 min Storm)
A 0.75 ac
Q 2.82 cfs (Max Required)
Depth of Flow 0.215 ft(@ required Flow)
Q 2.868766 cfs
A 0.783675 sf
R 0.179751
Pw 4.359779 ft
Top Width 4.29 ft
Outlet Velocity (V)= Q/A
✓ 3.660657 ft/s
LINER IS REQUIRED

Summey Engineering Associates, PLLC
Project: Basic Machinery
Job Number: E-5885
Channel Flow Equations
Temporary Ditch 1- Phase 2
Hydraulic Radius R=A/Pw 0.643462
Area A= 6 sf
Wetted Perimeter Pw= 9.324555 ft
Channel Slope S = 0.0238 ft/ft
Mannings Coeff. n = 0.02
Trapazoidal Ditch
Bottom Width 3 ft
Side Slope 3 :1
Top Width 9 ft
Depth 1 ft
Manning Equation
Q= (1.49/n)*A*R2/3*S1/2
Q= 51.40 cfs (Ditch Maximum)
Drainage Area
Type Area (AC) C
Bare Earth 0.56 0.5
Impervious 0.19 0.9
Q =CIA
C 0.60
I 7.52 in/hr (10 yr-5 min Storm)
A 0.75 ac
Q 3.39 cfs (Max Required)
Depth of Flow 0.237 ft(@ required Flow)
Q 3.404903 cfs
A 0.879507 sf
R 0.195493
Pw 4.49892 ft
Top Width 4.422 ft
Outlet Velocity (V)= Q/A
✓ 3.871377 ft/s
LINER IS REQUIRED

Summey Engineering Associates, PLLC
Project: Basic Machinery
Job Number: E-5885
Channel Flow Equations
Permanent Ditch 1-Construction Phase
Hydraulic Radius R=A/Pw 0.70643
Area A= 8 sf
Wetted Perimeter Pw= 11.32456 ft
Channel Slope S = 0.02 ft/ft
Mannings Coeff. n = 0.02
Trapazoidal Ditch
Bottom Width 5 ft
Side Slope 3 :1
Top Width 11 ft
Depth 1 ft
Manning Equation
Q= (1.49/n)*A*R2/3*Sl/2
Q= 66.86 cfs (Ditch Maximum)
Drainage Area
Type Area (AC) C
Bare Earth 0.56 0.5
Impervious 0.44 0.9
Q =CIA
C 0.68
I 7.52 in/hr (10 yr-5 min Storm)
A 1.00 ac
Q 5.08 cfs (Max Required)
Depth of Flow 0.239 ft(@ required Flow)
Q 5.08344 cfs
A 1.366363 sf
R 0.209836
Pw 6.511569 ft
Top Width 6.434 ft
Outlet Velocity (V)= Q/A
✓ 3.720417 ft/s
LINER IS REQUIRED

Summey Engineering Associates, PLLC
Project: Basic Machinery
Job Number: E-5885
Channel Flow Equations
Permanent Ditch 2-Construction Phase
Hydraulic Radius R=A/Pw 0.70643
Area A= 8 sf
Wetted Perimeter Pw= 11.32456 ft
Channel Slope S = 0.02 ft/ft
Mannings Coeff. n = 0.02
Trapazoidal Ditch
Bottom Width 5 ft
Side Slope 3 :1
Top Width 11 ft
Depth 1 ft
Manning Equation
Q= (1.49/n)*A*R2/3*Sl/2
Q= 66.86 cfs (Ditch Maximum)
Drainage Area
Type Area (AC) C
Bare Earth 0.25 0.5
Impervious 0.58 0.9
Q =CIA
C 0.78
I 7.52 in/hr (10 yr-5 min Storm)
A 0.83 ac
Q 4.87 cfs (Max Required)
Depth of Flow 0.233 ft(@ required Flow)
Q 4.86591 cfs
A 1.327867 sf
R 0.20512
Pw 6.473621 ft
Top Width 6.398 ft
Outlet Velocity (V)= Q/A
✓ 3.664456 ft/s
LINER IS REQUIRED

Summey Engineering Associates, PLLC
Project: Basic Machinery
Job Number: E-5885
Channel Flow Equations
Permanent Ditch 1- Post Construction
Hydraulic Radius R=A/Pw 0.70643
Area A= 8 sf
Wetted Perimeter Pw= 11.32456 ft
Channel Slope S = 0.02 ft/ft
Mannings Coeff. n = 0.03
Trapazoidal Ditch
Bottom Width 5 ft
Side Slope 3 :1
Top Width 11 ft
Depth 1 ft
Manning Equation
Q= (1.49/n)*A*R2/3*Sl/2
Q= 44.57 cfs (Ditch Maximum)
Drainage Area
Type Area (AC) C
Grass 0.56 0.2
Impervious 0.44 0.9
Q =CIA
C 0.51
I 7.52 in/hr (10 yr-5 min Storm)
A 1.00 ac
Q 3.82 cfs (Max Required)
Depth of Flow 0.2565 ft(@ required Flow)
Q 3.827827 cfs
A 1.479877 sf
R 0.22347
Pw 6.622248 ft
Top Width 6.539 ft
Outlet Velocity (V)= Q/A
✓ 2.586585 ft/s
LINER IS REQUIRED

Summey Engineering Associates, PLLC
Project: Basic Machinery
Job Number: E-5885
Channel Flow Equations
Permanent Ditch 2- Post Construction
Hydraulic Radius R=A/Pw 0.70643
Area A= 8 sf
Wetted Perimeter Pw= 11.32456 ft
Channel Slope S = 0.02 ft/ft
Mannings Coeff. n = 0.03
Trapazoidal Ditch
Bottom Width 5 ft
Side Slope 3 :1
Top Width 11 ft
Depth 1 ft
Manning Equation
Q= (1.49/n)*A*R2/3*Sl/2
Q= 44.57 cfs (Ditch Maximum)
Drainage Area
Type Area (AC) C
Grass 0.25 0.2
Impervious 0.58 0.9
Q =CIA
C 0.69
I 7.52 in/hr (10 yr-5 min Storm)
A 0.83 ac
Q 4.30 cfs (Max Required)
Depth of Flow 0.274 ft(@ required Flow)
Q 4.290244 cfs
A 1.595228 sf
R 0.236929
Pw 6.732928 ft
Top Width 6.644 ft
Outlet Velocity (V)= Q/A
✓ 2.689424 ft/s
LINER IS REQUIRED

rof~ . l
— _p -; -- j .
Maw
300
T
Outlet W = Do + 0.4La 120 — I
PIPe A. I � �' _
diameler(Lb) V 1i • I
La--.1 _� - i. ;�..
110 11
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er
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I i ■I II M rr IRM U ! ■ M .I ... :I•
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43
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•
3 5 10 20 50 100 200 500 1000
Discharge(ft3/sec)
Curves may not be extrapolated.
Figure 8.06b Design of outlet protection from a round pipe flowing full,maximum tailwater condition(Tw>_0.5 diameter).

rof~ . l
— _p -; -- j .
Maw
300
T
Outlet W = Do + 0.4La 120 — I
PIPe A. I � �' _
diameler(Lb) V 1i • I
La--.1 _� - i. ;�..
110 11
�_v TaI1watyr z 4.5Do ;.::: ' : r
. :.. It : r I100 :. �'; , ' �A' i
::i` ,,•: . r 'j ,ii j ,✓IJ j 1 .�I�IrA■I1il I 1 11R
901I 11i11 ! I y� ikl
.1 . ' !ril • —-•.:., 11111 II,1 IIII111
- -- --1 -- I '. 1 - i ••FI� i1 80iiiitirrit
hm fnnll`. I ; . t ti .i11�:'�
F-. 70 ;r■1 a 1 i .1, . a New
'C� 60IV /!IEi•. I AiM II !!
_ i : 1: ::_ 1 r III II t1l
_ • a - i11i. 1i 1 1 1111,P11
\� 50 n— a!'"''' • I ■ 1. 111 ill Il li ! 1 I11 11h
Ii-,1 Jl$Fw9
1€ 1■ 1l1, l J j 1111-I ill a "4 ... 1 ! rr II1' ,np 3
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,•. �IFl [II1
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er
1 F fl grails di n1I#i r ,� : : I ■I A 1 r ,f!i.A!I. . . J 'Il 111 1r.1
20 r ■1II II■tlMO .IMflfmiDv ',11 A1�11I i : 11.ii r • -r-0.0i1 ��®r �IIIltrl![I
1fi11 mar rr rI i 1 li I fill: ,-... I v'� __ �al�illfl:ltlfll N 1!■1 U 111t111f; :lir d1111r1 ■ I �jf3 1 .1 H •1 , I 1
1■■I f1 ■lfifr'■l I1Iet11tIIa"'I Ira - 11�11 . j. I 4.. CA --
I i ■I II M rr IRM U ! ■ M .I ... :I•
` -- 'L i 11 I�
10 rlil•I II
�alMl�irl118kTit■�11►■ 1'.ii rt '' L I: r 'bill
p T''' •i II : `::] ::E :�tie. " ill! ilii 1 CC
: is
.�1::--I I -i. ��illfit IN
.4,1 Cr:.1'.. . i- • ��, I '� - 15 1 �� I�IiiI#lei k1
43
.rl�' _. A�rim.- II
•
3 5 10 20 50 100 200 500 1000
Discharge(ft3/sec)
Curves may not be extrapolated.
Figure 8.06b Design of outlet protection from a round pipe flowing full,maximum tailwater condition(Tw>_0.5 diameter).