HomeMy WebLinkAbout20070231 Ver 1_Stormwater Info_20070823Engineering & Energy
Baker and Associates
A Unit o/Michael Baker Corporation
7800 Airport Center Drive, Suite 100 /~ ~,- ~~3'
Greensboro, NC 27409 V
(336) 931-1500
FAX (336) 931-1501
Letter of Transmittal
To: NC DWQ S.O. No.:
2321 Crabtree Blvd Project: Condition 2 of NC WOC 3404 issued to PTAA
Raleigh, NC 27604-2260
Attn: Ian McMillan ~~~,~ Date:
August 22, 2007
We are forwarding the following: ^ Attached ®Under Separate Cover ^ Other _
DWG. NO. NO. COPIES TITLE OR DESCRIPTION COMMENTS
1 Construction Site Stormwater Detention Pond For Submission and Review
Calculations Southwest Pond for HONDA Aircraft
Company Corporate Campus
~V15~ V L5 n
,.
per, 2 200"l
THESE ARE TRANSMITTED as checked below:
® As requested
^ For review and comment
^ For your information
^ No exception taken
^ Rejected -See remarks
^ Proceed subject to corrections noted
^ Revise and resubmit
^ Submit specified items
^ Other
GENERAL COMMENTS: Please find attached a copy of the SWMP for the
HONDA Aircraft facility in Greensboro, NC pursuant to Condition 2 of the WOC
3404 issued to the Piedmont Triad Airport Authority on March 19, 2007.
cc: file
Organization
Bv~ Richard Darling
title: Environmental Associate
Page: ~ of 1
Challenge
O~~F W A TF94G
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RECEIVED
MAR 2 22001
c ,.A~y4,
CERTIFIED MAIL:.70042514 0002 2177 7157
RETURN RECEIPT REQUESTED
Mr. Mickie Elmore
Piedmont Triad Airport Authority
P. O. Box 35445
Greensboro, NC 27425
Alan W. Klimek, P.E. Director
Division of Water Quality
March 19, 2007
`r' ~=!, u.-~ w DWQ# 07-0231
( % Guilford County
RECE~~
AUG 2 3 2007 ~ 2 2 ~
~~EiVR - WATER QUALITY
Y'/ETIAND3 AiYD STOR4QHATER BRANCH ~~~, &
APPROVAL of 401 Water Quality Certification with Additional Conditions
Dear Mr. Elmore:
The Piedmont Triad Airport Authority (PTAA) has our approval, in accordance with the attached conditions,
to place permanent fill in 100 linear feet of perennial stream in order to construct a road crossing for access
into PTAA property located at the intersection of Radar Road and the proposed extension of Ballinger Road in
Greensboro, Guilford County, as described in your application received by the North Carolina Division of
Water Quality (NCDWQ) on February 5, 2007. After reviewing your application, we have determined that
this- fill is covered by General Water Quality Certification Number 3404, which can be viewed on our web site
at http://www.ncwaterqualit r}_org,(wetlands.html. .This Certification allows you to use Nationwide Permit
Number 14 when it is issued by the U.S. Army Corps of Engineers. In addition, you should secure any other
applicable federal, state or local permits before you proceed with your project, including (but not limited to)
those required by Sediment.and Erosion Control, Non-Discharge, and Water Supply Watershed regulations.
Also, this approval will expire when the accompanying 404 permit expires unless otherwise specified in the
General Certification. ~ ,
This approval is valid only for the purpose and design that you have described in your application. If you
change your project, you must notify us in writing, and you may be required to send us a new application for a
new certification. If the property is sold, the new owner must be given a copy of the Certification and
approval letter and is thereby responsible for complying with all conditions. If total wetland fill for. this
project (now or in the future) exceeds one acre, or total fill to perennial streams equals or exceeds 1501inear
feet, compensatory mitigation may be required as described in 15A NCAC 2H .0506 (h). For this approval
to be valid, you must follow the conditions listed in the attached certification, as well as the additional
conditions listed below:
1. The following impacts are hereby approved as long as all other specific and general conditions of this
Certification are met. No other impacts, including incidental impacts, are approved:
r)Q""` Caro 'na
,1~atura~~y
North Carolina Division of Watcr Quality
Wetlands Certification Unit 1630 Mail Service Center Raleigh, NC 27699-1650 Phone (919) 733-1786 FAX (919)133.2496
2321 Crabtree Blvd. Raleigh, NC 27604.2260 Internet htto:llwww.ncwaterouaGty.org
Customer Service Number. 1.877-623-6748
Michael F. Easlry, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
An Equal OpportunirylAffmtalive Action Employer- 50% Recycledll0% Post Consumer Paper
` Mr. Mickie Elmore
Page 3, DWQ# 07-0231
March 19, 2007
6. Where riprap is required for energy dissipation and scour protection, it shall be limited to the minimum
dimensions specified by appropriate engineering calculations. Riprap may only be used below the
normalihigh water level. The original- grade and elevation of the stream's cross-section must be
maintained. Riprap placed in the stream bottom must be inserted into the bottom matrix to a depth
sufficient to provide the thickness of riprap required for scour protection. The elevation of the stream
bottom must not be .increased by the. placement of riprap. Placement of riprap must not result in
destabilization ofthe streambed or banks upstream or downstream of any crossing.
7. All construction activities associated with this project shall minimize built-upon surface area, direct
stormwater runoff away from surface waters, and incorporate best management practices to minimize
water quality impacts. If concrete is used with -any fill material, it shall not be allowed to come in
contact with surface waters until it has cured. If any stormwater must be collected for discharge into a
stream channel, it shall not enter the stream as a point source, but shall be slowed and discharged as
sheet flow prior to entering the riparian buffer on either side of the stream.
8. Upon finishing the project, the Applicant shall fill out and return the enclosed "Certificate of
Completion" to notify the NCDWQ when all work included in the §401 Certification has been
completed. This certificate should be returned to the Winston-Salem Regional Office of the NCDWQ at
the address listed on the form. Along with the Certificate of Completion, please send photographs
. upstream and downstream of the culvert site to document correct installation.
If you do not accept any of the conditions of this certification, you may ask for an adjudicatory hearing. You
must act within 60 days of the date that you receive this letter. To ask. for a hearing, send a written petition
which conforms to Chapter 150B of the North Carolina General Statutes to the Office of Administrative
Hearings, 6714 Mail Service Center, Raleigh, N.C. 27699-6714. This certification and its conditions are final
and binding unless you ask for a hearing.
This letter completes the review of the Division of Water Quality under Section 401 of the Clean Water Act.
If you have any questions, please telephone Daryl Lamb in the NCDWQ Winston-Salem Regional Office at
336-771-4959 or Ian McMillan in the Wetlands/401 Central Office in Raleigh at 919-715-4631.
Sincerely,
~~ ~i~
Alan W. Klimek, P.E.
AWK/cdl
Attachments
cc: Mr. Andy Williams, U. S. Army Corps of Engineers, Raleigh Regulatory Field Office
NCDWQ, Winston-Salem Regional Office
Central Files
Wetlands/401 File Copy `
Mr. Richard B. Darling, C.E., Baker and Associates, 7800 Airport Center Drive, Suite 100, Greensboro,
NC 27409
Mr. Mickie Elmore
Page 2, DWQ# 07-0231
Mazch 19, 2007
Amount A roved Plan Location or Reference
Streams -100 linear feet Unnamed tributary to Horsepen Creek located on Radar Road at its
intersection with the proposed extension ofBallinger Road in
Greensboro, Guilford County, as depicted on the site plan included
.with the a lication
2. A final, written stormwater management plan must be approved in writing by the Central Office of the
Wetlands/401 Certification Unit before the impacts specified in this authorization occur, per condition
No. 6 in General Certification 3404: The stormwater management plan must include plans and
specifications for stormwater management facilities that are appropriate for surface waters classified as
Class WS-IV and designed to remove, at a minimum, 85% Total Suspended Solids according to the
most recent version of the NCDENR stormwater Best Management Practices Manual. These facilities
must be designed to treat the runoff from the entire project, unless otherwise explicitly approved by the
Division of Water Quality. Also, before any new permanent building is occupied at the subject site, the
facilities (as approved by this Office) shall be constructed and operational, and the stormwater
management plan (as approved by this Office) shall be implemented. The structural stormwater practices
as approved by this Office, as well as drainage patterns, must be maintained in perpetuity. No changes
to the structural stormwater. practices shall be made without written authorization from the Division of
Water Quality. This stormwater management plan must be submitted to the Central Office of the
Wetlands/401 Certification Unit in Raleigh within 60 days of receiving this letter.
3. Appropriate sediment and erosion control measures which equal or exceed those outlined in the most
recent version of the North Carolina Erosion and Sediment Control Planning and Design Manual or the
North Carolina Surface Mining Manual (available from the Division of Land Resources at NCDENR
regional offices or the central office), whichever is more appropriate, shall be designed,. installed and
maintained properly to assure compliance at all times with the North Carolina water quality standards
that are applicable to Class WS-IV waters as described in 1 SA NCAC 02B .0216 Fresh Surface Water
Quality Standards For Class WS-IV Waters. These measures must be maintained on all construction
sites, borrow sites, and waste pile (spoil) sites, including contractor owned and leased borrow pits,
which aze associated with this project.
4. Sediment and erosion control measures shall not be placed in wetlands or waters to the maximum extent
practicable. If placement of sediment and erosion control measures in wetlands or waters is
unavoidable, they shall be removed and the natural grade restored within six months of the date that the
project is completed or, if applicable, within six months of the date that the project is released by the
North Cazolina Division of Land Resources. ~'
5. No waste, spoils, solids, or fill of any kind shall occur in wetlands, waters, or riparian areas beyond the
footprint of the impacts depicted in .the Pre-Construction Notification. All construction activities,
including the design, installation, operation, and maintenance of sediment and erosion control "Best
Management Practices" shall be performed so that. no violations of state water quality standazds,
statutes, or rules occur.
.~
August 77, 2007
1
1
1
CONSTRUCTION SITE STORMWATER
DETENTION POND CALCULATIONS
SOUTHWEST POND
For
aril
HONDA AIRCRAFT COMPANY
NEW CORPORATE CAMPUS
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SEAL
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Prepared For:
American Honda Motor Company, Inc.
6430 Ballinger Road
Greensboro, NC 27410
Prepared By:
Barge, Waggoner, Sumner and Cannon, Inc.
10133 Sherrill Boulevard, Suite 200
Knoxville, Tennessee 37932
BWSC 33238-01
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Existing Conditions
The existing site conditions were determined from a site field survey by McKim and
Creed Surveyors and were supplied to BWSC by the developer. The approximately 80
acre site is a previously undeveloped lease parcel owned by the Piedmont Triad Airport
Authority that is southeast and immediately adjacent to the Piedmont Triad International
Airport. The site was previously used as pasture and forest. Soils map information was
from the U.S. Department of Agriculture, Natural Resources Conservation Service web
site (http://websoilsurvey.nres.usda. ov/app/WebSoilSurve~px). A copy of the soils
mapping is included. The soil survey shows primarily sandy clay loams which are
classed as type C soils by for the SCS method.
Proposed Conditions
The site is proposed to be used as an aircraft research and development (R&D), and
production facility. The current planned facility will contain a corporate office building
and a R&D facility. The production facility is planned for a future phase. The site
topography for the area planned for the offices and R&D building slopes to the southwest
to an unnamed tributary of Horse Pen Creek. This area will drain through a piped
collection system, into a detention pond and to the stream. The pond is intended to serve
only this phase of the development. The future production facility area drains to the
southeast to another unnamed tributary of Horse Pen Creek. The drainage for the
production facility area has not been designed.
Methods and Assumptions
The hydrology and hydraulics were simulated in the Bentley CivilStorm software, V8
' XM Edition. An SCS approach was used for the curve numbers and times of
concentration. All catchbasins were assumed to be full capture type with no bypass
assumed. Structure head losses were calculated using an HEC-22 approach.
' Results
1
1
1
The stage-storage relationship for the detention pond was calculated using Microsoft
Excel and an average end area approach. Data and a graph are enclosed. The required 1
year storm storage volume for water quality was calculated using Mathcad v13 by
Mathsoft Engineering and Education, Inc. The calculated volume required was 42,140
cubic feet and corresponds to an elevation of 851.70 in the proposed pond. The pond
surface area at this elevation was calculated at 20,481.9 square feet. Using the approach
from page 60 of the City of Greensboro Stormwater Management Manual and assuming a
90% desired removal efficiency, a particle size of 4.6 microns was calculated as the
minimum particle size meeting the 90% removal efficiency.
07-031
Qr~c~r~odr~ ~
AUG 2 3 2007
UEN'~ -WATER 4UALITY
WETtAN03 AND STOR!+~NATER BRANCH
1
1
1
1
1 ear 2 ear 10 ear 25 ear 100 ear
Pre-Development
Flow, cfs
21.08
39.88
90.59
123.41
174.81
Post-Development
Flow, cfs
20.03
35.39
72.77
91.81
129.37
Pond Water
Surface Elev., ft
853.10
853.62
854.54
854.97
855.46
Freeboard, ft 4.90 4.38 3.46 3.03 2.54
Additionally, the one year event storm was routed and results are included for an
extended period of 5 days. The calculated water surface elevations in the pond are
850.90 and 850.81 at the start of the fourth day and the fifth day respectively. Both of
these elevations are above the 850.50 invert of the 2" outlet. Review of a longer
simulation (not included) shows the pond at 850.76 at around 5.5 days and is assumed to
be the final drain down point.
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Soil Map-Guilford County, North Carolina
n
Map Unit Legend
Guilford County, North Carolina (NC081)
Map Unit Symbol Map Unit Name Acres in AOf `Percent of AOI
CcC Cecil sandy loam, 6 to 10
percent slopes 2.4 0.4%
Ce62 Cecil sandy clay loam, 2 to 6
percent slopes, eroded 7.4 1.3%
CeC2 Cecil sandy clay loam, 6 to 10
percent slopes, eroded 0.2 0.0%
Ch Chewacla sandy loam 7.7 1.3%
Co Congaree loam 41.0 7.0%
En6 Enon fine sandy loam, 2 to 6
percent slopes 6.0 1.0%
EnC Enon fine sandy loam, 6 to 10
percent slopes 13.7 2.3%
EnD Enon fine sandy loam, 10 to 15
percent slopes 4.9 0.8%
IrB Iredell fine sandy loam, 0 to 4
percent slopes 21.2 3.6%
McD2 Madison clay loam, 10 to 15
percent slopes, eroded 5.6 1.0%
McE2 Madison clay loam, 15 to 25
percent slopes, eroded 8.5 1.4%
MhB2 Mecklenburg sandy clay loam, 2
to 6 percent slopes, eroded 235.7 40.3%
MhC2 Mecklenburg sandy clay loam, 6
to 10 percent slopes, eroded 113.0 19.3%
Ur Urban land 117.1 20.0%
W Water 0.8 0.1
' Totals for Area of Interest (AOI)
U~ Natural Resources
' Conservation Service
Web Soil Survey 2.0
National Cooperative Soil Survey
585.4
100.0%
8/17/2007
Page 3 of 3
Stage-Storage Data for Detention Pond, Honda Aeronautics, Greensboro, NC
Elevation Contour Area (sq ft) Storage (cu.ft.) Cum. Storage (cu.ft.)
849 3528.36 0 0
850 17119.08 10323.7 10323.7
851 19079.28 18099.2 28422.9
852 21083.04 20081.2 48504.1
853 23130.36 22106.7 70610.8
854 25221.24 24175.8 94786.6
855 27355.68 26288.5 121075.0
856 29620.8 28488.2 149563.3
857 31885.92 30753.4 180316.6
857.6 33279.84 19549.7 199866.3
Stage-Storage Data for Detention Pond, Honda Aeronautics,
Greensboro, NC
220000
200000
180000
160000
140000
= 120000
100000
0
~ 80000
60000
40000
20000
849
0
I
___
I
~,
l-
', i
' ;,
~~ ~ F
-------- _- - --_ - - _ I-_------ ---------- -- --_
t,
1
850 851 852 853 854 855 856 857 858
Elevation
'
Stuart Hen P.E. Honda Aircraft Facili Greensboro NC
rY, tY, 1 of 3
' 8/15/2007 33238-01 PondCalcs.xmcd
First flush basin calculation 849 0
' Find Volume of Rainfall
area of site is: Area := 14.06•acre % impervious I:= 85
850
10323.7
by Schuler Method: Rv := 0.05 + 0.009•I Rv = 0.815 851 28422.9
' first. flush basin volume is: Vol := R„•r•Area Vol = 41595.8 ft3 852 48504.1
853 70610.8
Find elevation for required volume input data to matrix: stage
storage :_
' _
`0)
(1) 854 94786.6
Set Variables: X := Stage_Storage
n := rows(Stage_Storage)
Y := Stage_Storage 855 121075.0
enter degree of polynomial to fit: k:= 5
856 149563.3
' number of data points: n = 10 regress data: z := regress(x,Y,k)
g57 180316.6
polynomial fitting function: fit(x) := interp(z,x,Y,x)
set variable: coeffs := submatrix(z, 3 , length(z) - 1, 0, 0) 857.6 199866.3
coefficient values are coeff T = 02.418 X 1015 -1.415 x 1013 3.315 X 1010 -3.882 x 107 2.273 X 10 4 -5.322)
'
2
~(fit(X) - mean(t))
' R2 value: = 0.99998 Degrees of freedom: n - k -1 = 4
2
~(Y -mean(t))
' Plots
5
2.10
' 1.8.105
' 1.6.105
S
1.4.10
1
2 •105
w .
U
~ 1 •105
bA
0
8.104
_
6.104
Polynomial Regression of Y on X
' 4.104
2.104
0 `~ '
849 849.5 850 850.5 851 851.5 852 852.5 853 853.5 854 854.5 855 855.5 856 856.5 857 857.5 858
Elevation (in feet)
f •+• X-Y data
' Least-squares fit
Stuart Hen P.E. Honda Aircraft Facili Greensboro NC 2 of 3
rY, tY, ,
8/15/2007 33238-01 PondCalcs.xmcd
' Residual Plot
500
i I
i
-- ~
400 ~ '
i
I
' 300
I
I I `
200
' 100
i
1 .................... .. ~
0 __
I '
-100 ......... _._........_i. .. _ _..: ,..... ........ _ _ _._. +
I
' i
' '
i
~00 ..._ ................._...._....._....._-____...__............_.._......_..............i..._............... _..........._.....___...... _
i
I
I...
_...._ , .
......
-300...._...__....__...._..._ ............... _._.......-~-----...__..._........._.........._...._....----._....._ _
i
i
I
-400 ._..._............_..._..... _.._... ; -• --_._..... ;...- -- - -..... _ ...- - ... __ . _ ..
j j
-500 ~ I ~
849 850 851 852 853 854 855 856 857 858
' first flush volume req'd. (see calc. above): vo1 = 41595.81 •ft3 remove units: vol := vol
ft3
' fit(vol) := interp(z,X,Y,851.6745) fit(vol) = 41604.5
therefore, use: fit(vo1) := interp(z, x, Y, 851.7) fit(vot) = 42140.5
Stage/storage relationship for pond shows required volume at approx. elevation of 851.67. Therefore, the
' volume provided at elev. 851.7, 42140.5 cubic feet, is more than required.
Stuart Henry, P.E. Honda Aircraft Facility, Greensboro, NC 3 of 3
8/15/2007 33238-01 PondCalcs.xmcd
ft ft3
' define constants: fps :_ - ofs :_ -
s s
vo1 := fit(vo1)•ft3 vo1 = 42140.5 ft3 required 1 year storm volume (see calculation above)
and surface area at elevation 851.7 - 2
p AS :- 20481.9•ft
' yol Q° = 0.488 cfs from page 60 of City of Greensboro Stormwater Management Manual
Q° ~_
24•hr
set desired trap efficiency: E := 90•°~°
set guess value for particle settling velocity: w := 0.0004• ft
s
' calculate particle settling velocity provided in pond for 90% efficiency:
Given
AS = -Q° • ln(1 - E) from page 60 of City of Greensboro Stormwater Management Manual
w
w := Find(w) w = 0.000055 fps
set specific weight and kinematic viscosity for water at 60 degrees F.
2
rf:= 62.37• ib µ := 2.359.10 5.1b ss v := 1.217.10 5• ft
ft3 ft2 s
set particle specific gravity (quartz assumed): sG := 2.65
set guess value for particle size: dia := 20•micron
calculate 90% efficiency particle size based on pond settling velocity provided:
Given
1 dia2• Stokes relationship, eqn. 7.4, Design Hydrolo~y and Sedimentolo~y for
w = 18 • v g•(sG - 1) Small Catchments, C.T. Haan, B.J. Barfield and J.C. Hayes, Academic
' Press, Inc., San Diego, CA, 1994.
dia := Find(dia) dia = 4.585 micron 5 microns is break between silt & clay by AASHTO T-88
check that Re olds number < 0.5
3'n
eqn. 7.3, Desi ngn Hydrology and Sedimentolo~ for Small
w•dia _ 5 Catchments, C.T. Haan, B.J. Barfield and J.C. Hayes,
~ '- ~ Re = 6.777 x 10
Academic Press, Inc., San Diego, CA, 1994.
therefore, pond will collect sediment down to 4.6 microns at 90% or greater efficiency
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Honda Aeronautics, Greensboro, NC
Catchment Table
Label
Outflow Node Area
(acres) Tc
(min) Composite
SCS CN Peak Flow
(cfs) Total Runoff Vol.
(cu.ft.)
CM-2 25: CB-4 0.252 1.2 98.0 0.94 2294.9
CM-3 26: CB-5 0.246 1.3 98.0 0.86 2238.3
CM-4 27: CB-6 0.202 1.3 98.0 0.71 1840.4
CM-5 36: CB-15 0.201 1.4 98.0 0.70 1832.3
CM-6 35: CB-14 0.201 1.4 98.0 0.70 1833.5
CM-7 34: CB-13 0.153 1.4 98.0 0.53 1392.4
CM-8 33: CB-12 0.101 2.4 98.0 0.35 917.9
CM-9 33: CB-12 0.751 6.3 74.0 0.79 2038.6
CM-10 33: CB-12 0.209 2.8 98.0 0.73 1902.8
CM-11 30: CB-9 0.231 1.6 98.0 0.81 2103.4
CM-12 28: CB-7 0.299 3.4 83.1 0.58 1347.4
CM-13 29: CB-8 0.404 4.0 90.1 1.10 2572.7
CM-14 37: CB-16 0.663 4.1 84.9 1.42 3279.6
CM-15 38: CB-17 0.362 4.1 88.4 0.92 2126.0
CM-16 32: CB-11 0.138 1.5 98.0 0.48 1257.5
CM-17 31: CB-10 0.122 1.4 98.0 0.43 1107.2
CM-18 23: CB-3 0.129 1.7 98.0 0.45 1169.7
CM-19 39: CB-18 0.108 1.3 98.0 0.38 981.9
CM-20 40: CB-19 0.221 2.5 92.0 0.65 1540.8
CM-21 41: CB-20 0.263 2.3 91.1 0.75 1764.5
CM-22 21: CB-2 0.209 2.1 90.4 0.58 1359.6
CM-23 19: CB-1 0.186 1.8 92.8 0.57 1364.1
CM-24 61: CB-23 0.191 2.3 98.0 0.67 1738.8
CM-25 60: CB-22 0.247 1.9 98.0 0.87 2272.2
CM-26 59: CB-21 0.825 2.8 95.1 2.69 6605.3
CM-27 84: CB-26 0.202 1.3 98.0 0.71 1838:7
CM-28 63: CB-25 0.401 3.0 86.1 0.91 2107.5
CM-29 62: CB-24 0.874 2.2 90.7 2.29 5370.9
CM-30 138: CB-28 0.052 1.1 89.0 0.14 312.5
CM-31 175: MH-20 0.514 4.6 98.0 1.79 4681.9
CM-32 176: MH-21 0.514 4.6 98.0 1.79 4681.9
CM-33 167: MH-18 0.091 2.1 98.0 0.32 829.3
CM-34 168: MH-19 0.091 2.1 98.0 0.32 826.5
CM-3 S 177: MH-22 0.514 4.6 98.0 1.79 4681.9
CM-36 159: MH-14 0.526 4.6 98.0 1.84 4791.2
CM-37 160: MH-15 0.526 4.6 98.0 1.84 4791.2
CM-38 161: MH-16 0.526 4.6 98.0 1.84 4791.2
CM-39 162: MH-17 0.526 4.6 98.0 1.84 4791.2
CM-40 156: MH-13 0.052 1.4 98.0 0.18 468.9
CM-41 155: MH-12 0.052 1.4 98.0 0.18 471.3
CM-42 153: MH-11 0.052 1.4 98.0 0.18 468.9
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CM-43 188: CS-2 3.21 9.2 74.0 3.17 8712.4
CM-44 191: CS-4 2.891 2.4 76.1 3.66 8902.1
CM-45 200: CS-8 2.748- 7.1 74.0 2.83 7459.6
CM-46 197: CS-7 1.87 4.7 74.0 2.03 5075.5
CM-47 195: CS-6 2.09 7.3 75.8 2.44 6328.3
CM-48 218: CB-29 1.636 5.2 94.5 5.24 12767.9
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1
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Honda Aeronautics, Greensboro, NC
' Channel Table
1
1
1
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~,
Label
Start-node
Stop-node Start Invert
(ft) Stop Invert
(ft) Length
(ft)
Slope Max.Flow
(cfs) Max.Velocity
(ft/s)
CH-2 1.88: CS-2 189: CS-3 855.50 855.00 8.46 5.0% 3.17 2.93
CH-3 189: CS-3 191: CS-4 855.00 841.00 501.32 2.6% 3.08 2.36
CH-4 191: CS-4 192: CS-5 841.00 840.00 104.68 0.6% 6.20 1.82
CH-5 195: CS-6 197: CS-7 848.50 832.50 516.76 2.8% 2.42 1.90
CH-6 197: CS-7 196: OF-3 832.50 831.50 27.67 6.9% 20.03 5.30
CH-7 200: CS-8 197: CS-7 835.00 832.50 70.04 3.5% 17.15 4.41
CH-8 192: CS-5 200: CS-8 840.00 835.00 395.63 1.5% 5.78 2.38
CH-11 208: OS-2 192: CS-5 854.80 840.00 181.24 8.2% 0.00 0.00
CH-16 297: CS-12 200: CS-8 848.00 835.00 345.87 3.8% 12.70 3.55
Honda Aeronautics, Greensboro, NC
i
Pond Table
Label
Volume Type Initial Elevation
(ft) Max.Hydraulic Grade
(ft) Max. Storage
(cu.ft.)
PO-1 Elevation-Area 850.50 853.10 67177.32
' Outlet Structures
1
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Id Label Upstream Pond Has Control Structure
203 OS-1 184: PO-1 Yes
208 OS-2 184: PO-1 Yes
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Honda Aeronautics, Greensboro, NC
Catchment Table
Label
Outflow Node Area
(acres) Tc
(min) Composite
SCS CN Peak Flow
(cfs) Total Runoff Vol.
(cu.ft.)
CM-2 25: CB-4 0.252 1.2 98.0 1.13 2987.6
CM-3 26: CB-5 0.246 1.3 98.0 1.10 2913.9
CM-4 27: CB-6 0.202 1.3 98.0 0.91 2396.4
CM-5 36: CB-15 0.201 1.4 98.0 0.90 2385.9
CM-6 35: CB-14 0.201 1.4 98.0 0.90 2387.4
CM-7 34: CB-13 0.153 1.4 98.0 0.69 1813.3
CM-8 33: CB-12 0.101 2.4 98.0 0.45 1196.2
CM-9 33: CB-12 0.751 6.3 74.0 1.37 3380.4
CM-10 33: CB-12 0.209 2.8 98.0 0.94 2477.6
CM-11 30: CB-9 0.231 1.6 98.0 1.04 2738.6
CM-12 28: CB-7 0.299 3.4 83.1 0.87 2018.1
CM-13 29: CB-8 0.404 4.0 90.1 1.52 3602.7
CM-14 37: CB-16 0.663 4.1 84.9 2.08 4825.1
CM-15 38: CB-17 0.362 4.1 88.4 1.29 3025.0
CM-16 32: CB-11 0.138 1.5 98.0 0.62 1637.8
CM-17 31: CB-10 0.122 1.4 98.0 0.55 1442.3
CM-18 23: CB-3 0.129 1.7 98.0 0.58 1523.6
CM-19 39: CB-18 0.108 1.3 98.0 0.48 1279.3
CM-20 40: CB-19 0.221 2.5 92.0 0.88 2120.2
CM-21 41: CB-20 0.263 2.3 91.1 1.03 2449.3
CM-22 21: CB-2 0.209 2.1 90.4 0.80 1899.0
CM-23 19: CB-1 0.186 1.8 92.8 0.77 1863.3
CM-24 61: CB-23 0.191 2.3 98.0 0.86 2264.1
CM-25 60: CB-22 0.247 1.9 98.0 1.12 2958.1
CM-26 59: CB-21 0.825 2.8 95.1 3.54 8833.1
CM-27 84: CB-26 0.202 1.3 98.0 0.91 2394.2
CM-28 63: CB-25 0.401 3.0 86.1 1.32 3062.6
CM-29 62: CB-24 0.874 2.2 90.7 3.15 7480.4
CM-30 138: CB-28 0.052 1.1 89.0 0.19 442.7
CM-31 175: MH-20 0.514 4.6 98.0 2.31 6094.5
CM-32 176: MH-21 0.514 4.6 98.0 2.31 6094.5
CM-33 167: MH-18 0.091 2.1 98.0 0.41 1081.2
CM-34 168: MH-19 0.091 2.1 98.0 0.41 1077.4
CM-35 177: MH-22 0.514 4.6 98.0 2.31 6094.5
CM-36 159: MH-14 0.526 4.6 98.0 2.36 6236.8
CM-37 160: MH-15 0.526 4.6 98.0 2.36 6236.8
CM-38 161: MH-16 0.526 4.6 98.0 2.36 6236.8
CM-39 162: MH-17 0.526 4.6 98.0 2.36 6236.8
CM-40 156: MH-13 0.052 1.4 98.0 0.23 613.5
CM-41 155: MH-12 0.052 1.4 98.0 0.23 616.6
CM-42 153: MH-11 0.052 1.4 98.0 0.23 613.5
0
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CM-43 188: CS-2 3.21 9.2 74.0 5.45 14447.3
CM-44 191: CS-4 2.891 2.4 76.1 6.13 14384.4
CM-45 200: CS-8 2.748 7.1 74.0 4.88 12369.7
CM-46 197: CS-7 1.87 4.7 74.0 3.54 8416.4
CM-47 195: CS-6 2.09 7.3 75.8 4.05 10260.4
CM-48 218: CB-29 1.636 5.2 94.5 6.92 17160.8
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Honda Aeronautics, Greensboro, NC
'Channel Table
Label
Start-node
Stop-node Start Invert
(ft) Stop Invert
(ft) Length
(ft)
Slope Max.Flow
(cfs) Max.Velocity
(ft/s)
CH-2 188: CS-2 189: CS-3 855.50 855.00 8.46 5.0% 5.37 3.50
CH-3 189: CS-3 191: CS-4 855.00 841.00 501.32 2.6% 5.37 2.83
CH-4 191: CS-4 192: CS-5 841.00 840.00 104.68 0.6% 10.99 2.13
CH-5 195: CS-6 197: CS-7 848.50 832.50 516.76 2.8% 4.05 2.33
CH-6 197: CS-7 196: OF-3 832.50 831.50 27.67 6.9% 35.39 6.30
CH-7 200: CS-8 197: CS-7 835.00 832.50 70.04 3.5% 29.07 4.90
CH-8 192: CS-5 200: CS-8 840.00 835.00 395.63 1.5% 10.76 2.87
CH-11 208: OS-2 192: CS-5 854.80 840.00 181.24 8.2% 0.00 0.00
CH-16 297: CS-12 200: CS-8 848.00 835.00 345.87 3.8% 23.43 4.22
1
u
1
Honda Aeronautics, Greensboro, NC
u
Pond Table
Label
Volume Type Initial Elevation
(ft) Max.Hydraulic Grade
(ft) Max. Storage
(cu.ft.)
PO-1 Elevation-Area 850.50 853.62 79825.09
' Outlet Structures
1
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Id Label Upstream Pond Has Control Structure
203 OS-1 184: PO-1 Yes
208 OS-2 184: PO-1 Yes
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Honda Aeronautics, Greensboro, NC
Catchment Table
Label
Outflow Node Area
(acres) Tc
(min) Composite
SCS CN Peak Flow
(cfs) Total Runoff Vol.
(cu.ft.)
CM-2 25: CB-4 0.252 1.2 98.0 1.66 4448.4
CM-3 26: CB-5 0.246 1.3 98.0 1.62 4338.7
CM-4 27: CB-6 0.202 1.3 98.0 1.33 3568.3
CM-5 36: CB-15 0.201 1.4 98.0 1.32 3552.6
CM-6 35: CB-14 0.201 1.4 98.0 1.32 3554.9
CM-7 34: CB-13 0.153 1.4 98.0 1.01 .2700.5
CM-8 33: CB-12 0.101 2.4 98.0 0.66 1782.2
CM-9 33: CB-12 0.751 6.3 74.0 2.75 6664.1
CM-10 33: CB-12 0.209 2.8 98.0 1.37 3689.1
CM-11 30: CB-9 0.231 1.6 98.0 1.52 4077.5
CM-12 28: CB-7 0.299 3.4 83.1 1.52 3542.8
CM-13 29: CB-8 0.404 4.0 90.1 2.41 5841.1
CM-14 37: CB-16 0.663 4.1 84.9 3.53 8294.9
CM-15 38: CB-17 0.362 4.1 88.4 2.08 4998.1
CM-16 32: CB-11 0.138 1.5 98.0 0.91 2439.3
CM-17 31: CB-10 0.122 1.4 98.0 0.80 2148.4
CM-18 23: CB-3 0.129 1.7 98.0 0.85 2269.5
CM-19 39: CB-18 0.108 1.3 98.0 0.71 1905.8
CM-20 40: CB-19 0.221 2.5 92.0 1.36 3366.9
CM-21 41: CB-20 0.263 2.3 91.1 1.61 3930.1
CM-22 21: CB-2 0.209 2.1 90.4 1.26 3068.9
CM-23 19: CB-1 0.186 1.8 92.8 1.18 2933.5
CM-24 61: CB-23 0.191 2.3 98.0 1.26 3371.4
CM-25 60: CB-22 0.247 1.9 98.0 1.64 4404.6
CM-26 59: CB-21 0.825 2.8 95.1 5.30 13567.3
CM-27 84: CB-26 0.202 1.3 98.0 1.33 3564.9
CM-28 63: CB-25 0.401 3.0 86.1 2.19 5188.6
CM-29 62: CB-24 0.874 2.2 90.7 4.94 12052.1
CM-30 138: CB-28 0.052 1.1 89.0 0.30 730.2
CM-31 175: MH-20 0.514 4.6 98.0 3.38 9073.6
CM-32 176: MH-21 0.514 4.6 98.0 3.38 9073.6
CM-33 167: MH-18 0.091 2.1 98.0 0.60 1611.1
CM-34 168: MH-19 0.091 2.1 98.0 0.60 1605.7
CM-35 177: MH-22 0.514 4.6 98.0 3.38 9073.6
CM-36 159: MH-14 0.526 4.6 98.0 3.46 9285.5
CM-37 160: MH-15 0.526 4.6 98.0 3.46 9285.5
CM-38 161: MH-16 0.526 4.6 98.0 3.46 9285.5
CM-39 162: MH-17 0.526 4.6 98.0 3.46 9285.5
CM-40 156: MH-13 0.052 1.4 98.0 0.34 916.4
CM-41 155: MH-12 0.052 1.4 98.0 0.34 920.9
CM-42 153: MH-11 0.052 1.4 98.0 0.34 916.4
7
1
ii
CM-43 188: CS-2 3.21 9.2 74.0 10.89 28480.8
CM-44 191: CS-4 2.891 2.4 76.1 11.92 27553.0
CM-45 200: CS-8 2.748 7.1 74.0 9.88 24384.8
CM-46 197: CS-7 1.87 4.7 74.0 7.17 16591.8
CM-47 195: CS-6 2.09 7.3 75.8 7.94 19728.7
CM-48 218: CB-29 1.636 5.2 94.5 10.41 26515.0
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Honda Aeronautics, Greensboro, NC
' Channel Table
Label
Start-node
Stop-node Start Invert
(ft) Stop Invert
(ft) Length
(ft)
Slope Max.Flow
(cfs) Max.Velocity
(ft/s)
CH-2 188: CS-2 189: CS-3 855.50 855.00 8.46 5.0% 10.89 4.43
CH-3 189: CS-3 191: CS-4 855.00 841.00 501.32 2.6% 10.89 3.54
CH-4 191: CS-4 192: CS-5 841.00 840.00 104.68 0.6% 21.60 2.57
CH-5 195: CS-6 197: CS-7 848.50 832.50 516.76 2.8% 7.81 2.87
CH-6 197: CS-7 196: OF-3 832.50 831.50 27.67 6.9% 72.77 7.69
CH-7 200: CS-8 197: CS-7 835.00 832.50 70.04 3.5% 59.54 5.97
CH-8 192: CS-5 200: CS-8 840.00 835.00 395.63 1.5% 21.37 3.50
CH-11 208: OS-2 192: CS-5 854.80 840.00 181.24 8.2% 0.00 0.00
CH-16 297: CS-12 200: CS-8 848.00 835.00 345.87 3.8% 39.61 4.94
1
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Honda Aeronautics, Greensboro, NC
Pond Table
Label
Volume Type Initial Elevation
(ft) Max.Hydraulic Grade
(ft) Max. Storage
(cu.ft.)
PO-1 Elevation-Area 850.50 854.54 103,339.48
Outlet Structures
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203 OS-1 184: PO-1 Yes
208 OS-2 184: PO-1 Yes
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Honda Aeronautics, Greensboro, NC
Catchment Table
Label
Outflow Node Area
(acres) Tc
(min) Composite
SCS CN Peak Flow
(cfs) Total Runoff Vol.
(cu.ft.)
CM-2 25: CB-4 0.252 1.2 98.0 2.44 6641.6
CM-3 26: CB-5 0.246 1.3 98.0 2.38 6478.1
CM-4 27: CB-6 0.202 1.3 98.0 1.96 5327.9
CM-5 36: CB-15 0.201 1.4 98.0 1.95 5304.4
CM-6 35: CB-14 0.201 1.4 98.0 1.95 5307.8
CM-7 34: CB-13 0.153 1.4 98.0 1.48 4032.2
CM-8 33: CB-12 0.101 2.4 98.0 0.98 2661.7
CM-9 33: CB-12 0.751 6.3 74.0 5.04 12217.4
CM-10 33: CB-12 0.209 2.8 98.0 2.03 5508.3
CM-11 30: CB-9 0.231 1.6 98.0 2.24 6088.2
CM-12 28: CB-7 0.299 3.4 83.1 2.50 5966.8
CM-13 29: CB-8 0.404 4.0 90.1 3.71 9276.3
CM-14 37: CB-16 0.663 4.1 84.9 5.70 13755.6
CM-15 38: CB-17 0.362 4.1 88.4 3.26 8048.7
CM-16 32: CB-11 0.138 1.5 98.0 1.34 3642.4
CM-17 31: CB-10 0.122 1.4 98.0 1.18 3208.2
CM-18 23: CB-3 0.129 1.7 98.0 1.25 3388.8
CM-19 39: CB-18 0.108 1.3 98.0 1.05 2846.1
CM-20 40: CB-19 0.221 2.5 92.0 2.07 5265.9
CM-21 41: CB-20 0.263 2.3 91.1 2.46 6193.7
CM-22 21: CB-2 0.209 2.1 90.4 1.94 4861.9
CM-23 19: CB-1 0.186 1.8 92.8 1.78 4558.8
CM-24 61: CB-23 0.191 2.3 98.0 1.85 5033.9
CM-25 60: CB-22 0.247 1.9 98.0 2.42 6576.4
CM-26 59: CB-21 0.825 2.8 95.1 7.91 20713.5
CM-27 84: CB-26 0.202 1.3 98.0 1.96 5322.8
CM-28 63: CB-25 0.401 3.0 86.1 3.50 8511.6
CM-29 62: CB-24 0.874 2.2 90.7 7.59 19051.7
CM-30 138: CB-28 0.052 1.1 89.0 0.47 1173.0
CM-31 175: MH-20 0.514 4.6 98.0 4.99 13547.1
CM-32 176: MH-21 0.514 4.6 98.0 4.99 13547.1
CM-33 167: MH-18 0.091 2.1 98.0 0.89 2406.2
CM-34 168: MH-19 0.091 2.1 98.0 0.88 2398.1
CM-35 177: MH-22 0.514 4.6 98.0 4.99 13547.1
CM-36 159: MH-14 0.526 4.6 98.0 5.10 13863.4
CM-37 160: MH-15 0.526 4.6 98.0 5.10 13863.4
CM-38 161: MH-16 0.526 4.6 98.0 5.10 13863.4
CM-39 162: MH-17 0.526 4.6 98.0 5.10 13863.4
CM-40 156: MH-13 0.052 1.4 98.0 0.50 1369.8
CM-41 155: MH-12 0.052 1.4 98.0 0.51 1376.6
CM-42 153: MH-11 0.052 1.4 98.0 0.50 1369.8
1
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CM-43 188: CS-2 3.21 9.2 74.0 19.93 52213.8
CM-44 191: CS-4 2.891 2.4 76.1 21.22 49476.5
CM-45 200: CS-8 2.748 7.1 74.0 18.07 44704.3
CM-46 197: CS-7 1.87 4.7 74.0 13.10 30417.9
CM-47 195: CS-6 2.09 7.3 75.8 14.22 35524.5
CM-48 218: CB-29 1.636 5.2 94.5 15.59 40654.6
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Honda Aeronautics, Greensboro, NC
' Channel Table
Label
Start-node
Stop-node Start Invert
(ft) Stop Invert
(ft) Length
(ft)
Slope Max.Flow
(cfs) Max.Velocity
(ft/s)
CH-2 188: CS-2 189: CS-3 855.50 855.00 8.46 5.0% 19.64 5.32
CH-3 189: CS-3 191: CS-4 855.00 841.00 501.32 2.6% 19.64 4.24
CH-4 191: CS-4 192: CS-5 841.00 840.00 104.68 0.6% 39.37 3.01
CH-5 195: CS-6 197: CS-7 848.50 832.50 516.76 2.8% 14.12 3.44
CH-6 197: CS-7 196: OF-3 832.50 831.50 27.67 6.9% 129.37 9.01
CH-7 200: CS-8 197: CS-7 835.00 832.50 70.04 3.5% 106.32 7.16
CH-8 192: CS-5 200: CS-8 840.00 835.00 395.63 1.5% 39.14 4.12
CH-11 208: OS-2 192: CS-5 854.80 840.00 181.24 8.2% 0.00 0.00
CH-16 297: CS-12 200: CS-8 848.00 835.00 345.87 3.8% 75.83 5.92
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Honda Aeronautics, Greensboro, NC
Pond Table
Label
Volume Type Initial Elevation
(ft) Max.Hydraulic Grade
(ft) Max. Storage
(cu.ft.)
PO-1 Elevation-Area 850.50 855.46 128,466.28
Outlet t
S ructures
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Id Label Upstream Pond Has Control Structure
203 OS-1 184: PO-1 Yes
208 OS-2 184: PO-1 Yes