HomeMy WebLinkAboutSW8911207_Historical File_19911121 ..StArE4
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State of North Carolina
Department of Environment, Health, and Natural Resources
Wilmington Regional Office
James G. Martin, Governor Bob Jamieson
William W. Cobey, Jr., Secretary Regional Manager
November 21, 1991
DIVISION OF ENVIRONMENTAL MANAGEMENT )1Y-1(\l ( 1
�
Mr. Sidney Edward Jones �
� �� ��
°'
49 Raeford Street
Ocean Isle Beach, North Carolina 28459
Subject: Certification of Compliance
with Stormwater Regulations
Stormwater Project No. 910902
Jones Ford @ Shallotte
Brunswick County
Dear Mr. Jones :
This Certification is pursuant to the Stormwater Application
for Jones Ford @ Shallotte received on September 13, 1991, with
additional information received on November 21, 1991. Based on
our review of the project plans and specifications, we have
determined that the stormwater control system complies with the
Stormwater Regulations set forth in Title 15A NCAC 2H. 1003(i) .
The runoff will be treated in a detention pond which is sized to
achieve 90% reduction in Total Suspended Solids.
This Certification shall be effective from the date of
issuance until rescinded. The project shall be constructed and
maintained in accordance with the final plans and specifications
approved by the Wilmington Regional Office.
A professional engineer must certify that the stormwater
system has been installed in accordance with the approved plans
and specifications. The attached certification should be
received by this Office within 30 days of completion of
construction.
-Continued-
127 Cardinal Drive Extension,Wilmington,N.C.28405-3845•Telephone 919-395-3900•Fax 919-350-2004
An Equal Opportunity Affirmative Action Employer
Mr. Jones
November 21, 1991
Page Two
If you have any questions concerning this matter, please
call Alexis Finn or me at (919) 256-4161.
Sincerely,
�df4l'd'Y�Y ,
e Adkins
Water Quality Regional Supervisor
Attachment
DA/aif: 910902.NOV
cc: Don Covil, P.E. , Houston & Associates
Robert Tucker
John Parker, DCM
Alexis Finn
Wilmington Regional Office
Central Files
DIVISION OF ENVIRONMENTAL MANAGEMENT
Evaluation of Stormwater Treatment and Disposal System
Draining to Waters Other Than Class SA
PROJECT DATA
Project Name: Jones Ford @ Shallotte
Project No. : 910902
Location (County, Township/Municipality, Address) :
Shallotte, North Carolina
Brunswick County
Applicant Name: Mr. Sidney Edward Jones
Mailing Address: 49 Raeford Street
Ocean Isle Beach, North Carolina 28459
Submittal Date: September 13, 1991
Water Body Receiving Stormwater Runoff: Williams Branch
Classification of Water Body: "C Swamp"
DETENTION POND EVALUATION
1 . Yes No The design storage is for the runoff from all
impervious surfaces resulting from 1-inch of
rainfall and is located above the permanent
pool.
2. Yes No The permanent pool is designed for 90% TSS
removal. Therefore, no vegetative filter is
required.
3. Yes No The runoff completely draws down to the
permanent pool in 5 days, but not less than 2
days .
4 . Yes No The mean depth of the permanent pool is a
minimum of 3 feet.
5. Yes No The inlet structure is designed to minimize
turbulence and short circuiting.
6. Yes No An appropriate operation and maintenance plan
has been provided for the system.
-Continued-
WET DETENTION POND EVALUATION CONTINUED
7. Yes No THIS PROJECT MEETS THE STORMWATER CONTROL
REQUIREMENTS OF 15A NCAC 2H. 1003 (g) , (i) , (k) ,
and ( 1) (For Yes, 1 through 7 must all be
circled Yes. )
Brief Explanation: The surface area of this detention pond has
been designed to remove 90% TSS without the aide of a vegetative
filter.
DIVISION OF ENVIRONMENTAL MANAGEMENT SIGN-OFF
Wilmington Regional Office
„ /,„
Date Individu 1 E(aluating Form/Plans
ANN4700k KA/ )4411 kicACii
Date Water {Quality Regional Supervisor
cc: Applicant/WiRO/Mills/CF
Engineer's Certification
I. , as a duly registered
Professional Engineer in the State of North Carolina, having been
authorized to observe (periodically/weekly/full time) the
construction of the project,
(Project)
for the hereby state that, to
(Project Owner)
the best of my abilities, due care and diligence was used in the
observation of the project construction such that the
construction was observed to be built within substantial
compliance and intent of the approved plans and specifications.
Signature
Registration Number
Date
HOUSTON and ASSOCIATES, PA
REC1, EL)3
Consulting Engineers
SHALLOTTE, NORTH CAROLINA 28459 NOV 181991
Telephone(919)754-6324 WilitiftielifiefiiticniiOffice
Facsimile(919) 754-2121 Post Office Bort 2927
Friday, November 15, 1991
Ms. Alexis I. Finn, Environmental Engineer
Division of Environmental Management
North Carolina Department of Environment,
Health, and Natural Resources
127 Cardinal Drive Extension
Wilmington, North Carolina 28405
Subject: Jones Ford, Shallotte
Submittal of Revised Stormwater Plans
Dear Ms. Finn:
As a result of numerous conversations we have had with DEM over the
past several weeks, we have revised the subject plans by moving the proposed
stormwater detention pond to higher ground. Two copies of the revised plans
are enclosed for your review. We trust that approval of the stormwater plan
will be forthcoming.
Your attention to this matter is appreciated.
Sincerely,
4/4_„ef
Donald M. Covil, P.E.
Houston and Associates, P.A.
Enclosures
cc: Mr. Ed Jones
File; 91-0424 (Jones Ford)
� IY
tird.
State of North Carolina
Department of Environment, Health, and Natural Resources
Wilmington Regional Office
James G. Martin, Governor Bob Jamieson
William W. Cobey, Jr., Secretary Regional Manager
October 30, 1991
DIVISION OF ENVIRONMENTAL MANAGEMENT
Mr. Donald M. Covil, P.E.
Houston and Associates, P.A.
Post Office Box 2927
Shallotte, North Carolina 28459
Subject: Water Quality Certification
Project #91701
Jones Ford Shallotte
Brunswick County
Dear Mr. Covil:
The Wilmington Regional Office has reviewed your plans to
impact an undetermined amount of wetlands adjacent to Williams
Branch, Classified "C Swamp Waters", for the construction of a
stormwater retention pond. Based on this review and site visits,
it was evident that construction of the stormwater pond had
already begun, making a detailed evaluation of wetland impacts
difficult. If the wetland areas filled for the construction of
the stormwater pond were similar to existing wetlands adjacent to
the site, which we believe they were, significant uses were lost
by the construction of the stormwater pond. These uses include
water quality enhancement, wildlife habitat, and floodwater
storage. Insufficient evidence is present in your submittal to
conclude that your stormwater pond must be constructed in
wetlands . Additionally, it is the policy of this Division to
require that stormwater treatment systems not be constructed in
wetlands. Therefor this Office is moving towards recommending
denial of your 401 Certification.
127 Cardinal Drive Extension, Wilmington, N.C.28405-3845•Telephone 919-395-3900•Fax 919-350-2004
An Equal Opportunity Affirmative Action Employer
910701.oct
Page Two
Please provide us with information supporting your position
that your project must be constructed in wetlands. Specifically
can you construct your stormwater pond in another location, away
from all 404 wetlands. Please respond within 30 days of the date
of this letter.
If you have questions, please call Jim Gregson or me at
(919) 395-3900.
Sincerely,
ag2-12
Dave Adkins
Water Quality Regional Supervisor
JHG:910701.00T
cc: Wilmington Regional Office Files
Central Files
Alexis Finn
Wayne Wright (U.S. Army Corps of Engineers)
HOUSTON and ASSOCIATES, PA
Consulting Engineers
SHALLOTIE, NORTH CAROLINA 28459
Telephone(919)754-6324 491BlIain Street
Facsimile(919)754-2121 Post Office Box 2927
Friday, October 24, 199I
Ms. Alexis I. Finn, Environmental Engineer
Division of Environmental Management 1991
North Carolina Department of Environment,
Health, and Natural Resources
127 Cardinal Drive Extension
Wilmington, North Carolina 28405
Subject: Jones Ford, Shallotte
Submittal of Revised Stormwater Plans
Dear Ms. Finn:
We have revised the subject plans to include a trash rack covering the
riser and a hardware cloth covering the orifice. These revisions are in
compliance with your letter of October 21, 1991. Two copies of the affected
plan sheet are enclosed for your review.
Your letter indicated that the only remaining item preventing approval of
this project is 401 Wetland review and approval. We have been in contact with
Mr. Jim Gregson, and it appears that DEM will soon be taking a position
relative to this matter. Naturally, in the interest of our client, and in view of
the sound stormwater plan proposed, we trust that a positive response will be
forthcoming.
Your attention to this matter is appreciated. grECIElh f
U
Sincerely, OCT 2 9 1991
L) M
gi��,..: a 9oz
!?i%44J7- �.�✓
Donald M. Covil, P.E.
Houston and Associates, P.A.
Enclosures
cc: Mr. Ed Jones
File; 91-0424 (Jones Ford Site Plan and ECP)
4
NT e
State of North Carolina
Department of Environment, Health, and Natural Resources
Wilmington Regional Office
James G. Martin, Governor Bob Jamieson
William W. Cobey, Jr., Secretary Regional Manager
October 21, 1991
DIVISION OF ENVIRONMENTAL MANAGEMENT
Mr. Donald M. Covil, P.E.
Houston and Associates
Post Office Box 2927
Shallotte, North Carolina 28459
Subject: Additional Information
Stormwater Project No. 910902
Jones Ford, Shallotte
Brunswick County
Dear Mr. Covil:
The Wilmington Regional Office received additional
information submittal for Jones Ford @ Shallotte on October 8,
1991 . A review of that information has determined that the
following is needed to complete the stormwater review:
1. trash rack covering riser
2 . hardware cloth covering orifice
Please note that this file is on hold subject to 401 Wetland
review and approval by this Office. This information should be
received by this office no later than November 21, 1991. If you
have any questions, please call me at telephone number (919)
395-3900.
Since ,ly,
Ms. Alexis I. Finn
Environmental Engineer
AIF: 910902.00T
cc: (2) Alexis Finn
Central Files
127 Cardinal Drive Extension,Wilmington,N.C.28405-3845•Telephone 919-395-3900•Fax 919-350-2004
An Equal Opportunity Affirmative Action Employer
?roject I: 910902 File Name: DET902 Reviewer:Alexis Finn
Project Name: JONES FORD SHALLOTTE Date: 10/21/91
ss*HH*zx*svzsssss*DETENTION POND ANALYSIS*tettwtssss##e*ssssssses
Total Site Area, TA: TA= 255983 ft"2 tt
[TA (acre)] / [43560 ft"2/acre]= TA= 5,876561 Acres
Total Drainage Area, DA: DA= 190949 ft"2 It
[DA (acre)] / [43560 ft"2/acre]= DA= 4.383585 Acres
INNERVIOUS SURFACE AREA CALCULATIONS:
Structure Surface Area, A Runoff Coef., C
st
Buildings: 11858 1 Adjusted Surface Area = A * C = 11858 ft"2 It
Parking/sidewalks/streets: 109961 0,95 Adjusted Surface Area : A $ C = 104462.9 ft"2 It
Gre y; Areas: 69130 0.2 Adjusted Surface Area = A $ C = 13826 ft"2 It
TOTAL: 130146,9 ft"2 It
Percent Impervious, %I: note: SA=(BUILDING + PARKING.,)= 121819 sf
1SA/TA]*100=
[ 121819 / 255983 ]8100: %I= 47.591;1i
Note: If %I < 30% check Density Option.
If %I > 30%, require engineered system to minimize non-point stream degradation.
POND SI2IN':
Minimum Required Storage Volume, VOLreq: note: SA has been multiplied by runoff coefficients
[SA (tt`2) x (1 inch of runoff) * (1 ft/12 inch)]:
[ 130146,9 ft"2 * 1 inch s 0.083333 ft/inch]: VOLreq: 10845.57 ft"3
#t
POND SITING:
Bvttom Elevation, ELb: ELb = 11.5 ft It
i';Tianent stool Elevation, ELpp: ELpp 15 ft It
erm.ment Pool, App: App = 9881 ft"2 It
sorage Pon Elevation, Esp: ELsp= 16.1 ft ft
of at.;rage Pond, Asp: Asp : 13950 ft"2 It
PuLott Storage Cepth, d:
(via project engineer's design: d = ELsp - ELpp) d= 1.1 ft It
Storage Volume Provided, VOLpro: Side Slope: 3:1 ###i
Volume 1, Vi= App * d = 9881 ft"2 * 1.1 ft = V1= 10869.1 ft"3
Volume 2, V2: (Asp - App) * d * 0.5 : V2= 2237.95 ft"3
VOLpro = V1 + V2 : 10869.1 ft"3 + 2237.95 ft"3 VOLpro= 13107.05 ft"3
Nate: VOLreq < VOLpro; excess storage is available, therefore Pond Size is Acceptable.
..--� S Excess itOrng•: "(V. Lreq 1 YCLpr o) 1 100 ",;. +7 111<
DETENTION POND ANALYSIS CONTINUED: PAGE TWO
PERMENAN POOL'
Perm. Pool at Normal Level. 15 ft
Bottom of Pond : 11,5 ft
Provided, D - 3.5 it :kay, depth ? OFF fl,
SA/DA CALCULATION:
Ey Chart #4; @ 90% TSB:
Depth, D - 3.5 ft
t Impervious : 47.59%
DA - 4.383585 Acres Where DA is the Draninage Area
SA/DA % = 4.8 ##*#
Area of Permanent Pool Required = (SA/DA %) * DA
area of Permanent Pool Required = 4.8 $ 2.981162 Acres
Area of Permanent Pool Required 0.210412 Acres
Area of Permanent Pool Required = 9165,552 ft"2
provided9611-Sf C--vi;: sufficie t•stor
Area of PERMANENT �=quire^- 9+65.4,- =- area of
OUTLET SIZING:
VOLpro = 13107.05
0,-ifice outflow, 2 Day Drawdown = Volpro/[(2 day) * (86400 sec/day)]
Cr fice outflow, 2 Day Drawdown = 13107,05 ft"3 / 172800 sec = Q2= 0.075850 cfs
Orifice C.S. Area, A:
A: Q/[Cd((2gh)"0.5))]
A. 0.015850 / [0,6e((2e32,2e1.1)11.5))]= A2= 0.015020 ft"2
A2= 2.162883 inch"2
Pipe diameter, d: d2= 1.659478 inch
Note: Head, h : maximum pond level - permanent pond level : 1.1 ft
Coeficient of Discharge, Cd = 0.6
Crifice outflow, 5 Day Drawdown = Volpro/[(5 day) * (86400 sec/day)]
Orifice outflow, 5 Day Drawdown = 13107.05 ft"3 / 432000 sec = Q5: 0.030340 cfs
Oritice C.S. Area, A:
A: Q/[Cd((2gh)"0,5))]
A: 0.030340 / [0,6*((2*32,2x1,1)"0,5))]= A5= 0,006008 ft"2
A5= 0,865153 inch"2
Pipe diameter, d: d5= 1,049546 inch
CHECK: ;� �i�Y4i�=i1 i i ; .� � 1,S S 1,1 Orifice, is s1...?
HOUSTON and ASSOCIATES, PA
Consulting Engineers
SHALLOTIE, NORTH CAROLINA 28459
Telephone(919)754-6324 4918 Main Street
Facsimile(919)754-2121 Post Office Box 2927
Friday, October 4, I991
Ms. Alexis I. Finn, Environmental Engineer
Division of Environmental Management
North Carolina Department of Environment,
Health, and Natural Resources
127 Cardinal Drive Extension
Wilmington, North Carolina 28405 -
p C CC DU IE
Subject: Jones Ford, Shallotte
Submittal of Revised Stormwater Plans OCT 8 1991
Dear Ms. Finn: D h7
'nun # `I1090Z
We have revised the subject plans, and hereby provide other information
to comply with the comments presented in your September 30, 1991 letter to
us (copy attached). The revisions and/or information presented below are in
the order of the comments presented in your letter.
1. Sheet Number 2, "Site Plan", has been sealed, signed, and dated.
2. A notarized submittal authorization is provided. (It is noted that our
records show that we provided this with our original submittal to your
office.)
3. Property lines are clearly shown on the plans.
4. Based on our telephone conversation with you on 10/2/91, we do not
need to respond to the comment about the "routing of impervious
surfaces".
5. Pond inlets and outlets are shown on the plans. Labeling has been
added for clarity.
6. Sufficient detail for constructing the pond inlets and outlets is
presented on the plans. Finished grades are provided on the plan
view and elevations are provided on the associate details. Energy
dissipation features have been added.
Ms. Alexis Finn Page 2 Jones Ford SW Revisions
October 4, 1991
7. The US Army Corps of Engineers has been on site and has granted a
Nationwide Permit for construction activities within the wetlands
area. They have determined that due to the nature of this site and
area to be disturbed, a Predischarge Notification is not required (i.e.,
the COE does not require a 401 Water Quality Certification). DEM can
confirm this through contact with Ms. Jean Benton, COE, 251-4511.
8. A note has been added to the plans which addresses the receiving
stream characteristics.
9. An executed Operation and Maintenance Plan is enclosed.
One set of revised plans, along with the other items mentioned above,
are enclosed for your review and approval. We trust that this information
adequately addresses all of the comments presented in your letter. Please give
us a call at your earliest convenience if any concerns remain or if additional
explanations or information are necessary.
Your attention to this matter is appreciated. D I IE 0 t
D
Sincerely,
OCT8 1991 -I
DEM'
''ROJ # 9/0902_
Donald M. Covil, P.E.
Houston and Associates, P.A.
Enclosures
cc: Mr. Ed Jones
File; 91-0424 (Jones Ford Site Plan and ECP)
AUTHORIZATION FOR PREPARATION OF
STORMWTATER PLANS AND SPECIFICATIONS
AND
SUBMITTAL TO THE NORTH CAROL •
DIVISION OF ENVIRONMENTAL MANAG '
U
OCT 8 1991
PROJECT: JONES FORD U E
?RtOJ # gioca-z.
I, Sidney Edward Jones, do hereby authorize Houston and Associates,
P.A., Consulting Engineers, located in Shallotte, North Carolina, to prepare
stormwater plans and specifications for Jones Ford as necessary to make
submittal to, and obtain approval from, the North Carolina Department of
Environment, Health and Natural Resources, Division of Environmental
Management (NCDEHNR- DEM).
It is my understanding that said submittal is to be made to the
NCDEHNR- DEM on behalf of Jones Ford, as required under 15A NCAC 2H.
1003, for compliance to the North Carolina Stormwater Regulations.
WITNESS my hand this Q}`-• day of September, 1991.
11/
Sidney Vlward Jo
49 Raeford Street i
Ocean Isles Beach, N.C. 28459
STATE OF NORTH CAROLINA
COUNTY OF BRUNSWICK
I, a \e*, C . hVvreN - , a Notary Public of the State of North
Carolina, County of Brunswick do hereby certify that Sidney Edward Jones
personally appeared before me this day and executed the above authorization.
WITS$, nd and notarial seal this the �1, }v` day of September,
1991. .=' ��
i NOiARO.
% `5111 a. pbBLO C ; cj ;
1. .
' � �° " 'k• NOTARY PUBLIC
oo�C�,C 0��N�o�`'„
My Commission expires Mo.� Co \gcti, .
e" o
(*i4
State of North Carolina
Department of Environment, Health, and Natural Resources
Wilmington Regional Office
James G. Martin, Governor Bob Jamieson
William W. Cobey,Jr., Secretary Regional Manager
September 30, 1991
DIVISION OF ENVIRONMENTAL MANAGEMENT
Mr. Donald M. Covil, P.E.
Houston and Associates
Post Office Box 2927
Shallotte, North Carolina 28459
Subject: Additional Information
Stormwater Project No. 910902.SEP
Jones Ford, Shallotte
Brunswick County
Dear Mr. Covil :
The Wilmington Regional Office received a stormwater
submittal for Pembroke at Landfall on September 13, 1991. A
preliminary review has determined that the submittal for the
subject project is not complete. The following information is
needed to continue the stormwater review:
1. All P.E. seals need to be signed and dated.
2 . Provide a notarized submittal authorization.
3. Delineate property lines and show all existing and
proposed impervious surfaces.
4 . Show all routing of impervious surfaces to the pond.
5. Pond inlets and outlets need to be shown on the site
plan .
6 . Provide details of pond inlets and outlets with energy
dissipation and relevant elevations noted.
6 . Are wetlands located on-site? If, so please indicate
type and location on the site plan.
-continued-
127 Cardinal Drive Extension,Wilmington,N.C.28405-3845•Telephone 919-395-3900•Fax 919-350-2004
An Equal Opportunity Affirmative Action Employer
Mr. Covil
September 30, 1991
Page Two
Stormwater Project #910902
7. Where is runoff (in excess of design volume) routed?
Provide receiving stream characteristics?
8. Provide a detailed Operation and Maintenance Plan with
the owners: name, address, phone number, signature, and
date signed.
Please note that this is a preliminary review. This
information should be received by this office no later than
November 1, 1991. If you have any questions, please call me at
telephone number (919) 395-3900.
Sin ely,
5g!7e
Ms. Alexis I . Finn
Environmental Engineer
AIF: 910902 .SEP
cc: ( 2) Alexis Finn
Bill Mills
Central Files
AUTHORIZATION FOR PREPARATION OF
STORMWATER PLANS AND SPECIFICATIONS
AND
SUBMITTAL TO THE NORTH CAROLINA
DIVISION OF ENVIRONMENTAL MANAGEMENT
PROJECT: JOKES FORD
I, Sidney Edward Jones, do hereby authorize Houston and Associates,
P.A., Consulting Engineers, located in Shallotte, North Carolina, to prepare
stormwater plans and specifications for Jones Ford as necessary to make
submittal to, and obtain approval from, the North Carolina Department of
Environment, Health and Natural Resources, Division of Environmental
Management (NCDEHNR- DEM).
It is my understanding that said submittal is to be made to the
NCDEHNR- DEM on behalf of Jones Ford, as required under 15A NCAC 2H.
1003, for compliance to the North Carolina Stormwater Regulations.
WITNESS my hand this 'A}‘^ day of September, 1991.
Sidn dward Jo s
49 Raeford Stree
Ocean Isles Beach, N.C. 28459
STATE OF NORTH CAROLINA
COUNTY OF BRUNSWICK
I, �cA . 6. \ �,be , a Notary Public of the State of North
Carolina, County of Brunswick do hereby certify that Sidney Edward Jones
personally appeared before me this day and executed the above authorization.
WITNE S,, ,4 d and notarial seal this the L1'"~ day of September,
1991. `��.LV,,`''cA�B:....t/46F''�,.
••.
• v OTA1g4 :
_
'eGA'• •'* 4° NOT• 'YPUBLIC
P y •. •• . ..
My Commission expires t 1 10►GL, .
in)
SEP 1 3 1991
2ROJ
HOUSTON and ASSOCIATES, PA
Consulting Engineers
SHALLOTFE, NORTH CAROLINA 28459
Telephone(919)754-6324 4918 Main Street
Facsimile(919)754-2121 Post Office Box 2927
Monday, September 9, I991
Mr. Daniel E. Sams, P.E., Regional Engineer
Land Quality Section
North Carolina Department of Environment, RECEIVED
Health, and Natural Resources
127 Cardinal Drive Extension
Wilmington, North Carolina 28405 � � 1 � �
Iiifli ington Regional OfficC
Subject: Jones Ford, Shallotte "r"'
Submittal of Financial Responsibility Form and Fee
Dear Mr. Sams:
Enclosed are two copies of the site plan, erosion control/stormwater
plan, calculations, and Financial Responsibility/Ownership Form for the
subject project. Also enclosed is a check for $110.00 to cover the application
fee. This submittal supersedes our August 21, 1991 submittal which modified
the existing plan filed under 'Williamship Dealership" for an additional 12,000
SF (building pad area) of impervious area on the project site.
By copy of this letter, we are sending two copies of the site plan, erosion
control/stormwater plan, and calculations directly to Ms. Alexis Finn for
stormwater review. Also enclosed with our submittal to Ms. Finn is a form in
which the owner grants Houston and Associates the authority to submit a
stormwater plan for this project.
We appreciate your attention and assistance with this project, and trust
that you will contact us as soon as any questions may arise.
Sincerely,
Donald M. Covil, P.E.
Houston and Associates, P.A.
Enclosures
cc: Ms. Alexis Finn, NCDEHNR
Mr. Ed Jones i D I�+)
File; 91-0424 (Jones Ford Site Plan and E U
SEP 1 3 t99t
Rod # 9c p
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Ruston and Associates, P.A. JOB ,ro,.f��== / o Si7,- PLNN
SUBJECT /� zi ,ii Y/ S43 j,.-- ,1,.iJ..C-fe S
CONSULTING ENGINEERS SHEET NO. F
4918 Main Street Post Office Box 2927 CALCULATED BY (--i.-,-.-r DATF 8/2219/
Shallotte, North Carolina 28459 (919) 754-6324 CHECKED BY DATE
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Ilouston and Associates, P.A. JOB
SUBJECT
CONSULTING ENGINEERS SHEET NO. OF
4918 Main Street Post Office Box 2927 CALCULATED BY DATF
Shallotte, North Carolina 28459 (919) 754-6324 CHECKED BY DATE
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CHART 3
NORTH CAROLINA COASTAL REGIONS
SA/DA PERCENTAGES FOR WET DETENTION BASINS
DESIGNED TO REMOVE 85% TSS ( 1 " STORM)
SA/DA % For Basin Depths
Impervious % 3 Ft 3.5 Ft 4 Ft 5 Ft
. 30 2-.5 2.2 . 1 .9 . 1 .6
40 3.4 3.0 2.6 - 2. 1
50 4.2 3.7 3.3 2.7
60 5.0 4.5 3.8 3.2
_ 70 6.0 5.2 4.5 3.7
80 6:8 6.0 5.2 4.2
90 7,5 6.5 5.e 4.8
•
CHART 4
SA/DA PERCENTAGES FOR WET DETENTION BASINS
DISCHARGING DIRECTLY TO A STREAM
(HENCE NO VEGETATIVE FILTER, POST-DEVELOPMENT DISCHARGE
-- - -.. .-__ _ RATE < PRE-DEVELOPMENT RATE _FOR 1 O_ YEAR STORM) -
SA/DA A For Basin Depths
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60 7.0 6 5.3 4.3 3.4
70 8. 1 7 6.0 5.0 3.9
t 80 9.4 8 7.0 5.7 4.6
90 10.7 9 7.9 6 .5 5.2
Interpolate intermediate values
- - - SA/DA % = :surface area basin/drainage area to _basin._x -I
36A
Houston and Associates, P.A. JOB s-°"e....r °~d
SUBJECT 7.6-n/°dy
CONSULTING ENGINEERS SHEET NO. OF
4918 Main Street Post Office Box 2927 CALCULATED BY 47i,,.... DATF 8/21/4/
Shallotte, North Carolina 28459 (919) 754-6324 CHECKED BY DATE
SCALE
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SUBJECT Gi.4,,,,..../ /41+-._../;z.s
CONSULTING ENGINEERS SHEET NO. OF 1
4918 Main Street Post Office Box 2927 CALCULATED BY 9h DATF 8/27,43/
Shallotte, North Carolina 28459 (919) 754-6324 CHECKED BY DATE
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MANNINGS N VALUE : I
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SLOPE OF CHANNEL BANKS : .1 (VERT/HORZ) ;
--1 -a--�--- DEPTH OF FLOW: .4 FT .
VELOCITY: 3 .603513 FPS
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Shallotte, North Carolina 28459 (919) 754-6:324 rii--E. ED 3', ),.,T.---
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GRASSED SWALE ALONG SOUTHERN PL BETWEEN CONTOURS 15 ' & 16
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MANNINGS N VALUE : .03F,
SLOPE OF CHANNEL BOTTOM : .013
SLOPE OF CHANNEL BANKS : . 1 (VERT/HORZ) . _
. DEPTH OF FLOW : .67 FT .
---—1 VELOCITY : 2 .327261 FPS
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SLOPE OF CHANNEL BANKS : .05 (VERT/HORZ)
DEPTH OF FLOW: .39 FT. L .
VELOCITY : 3. 46251 FPS
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CONSULTING ENGINEERS 5H_=T
4491S Main Street Post Office Box 2927 '�ALC1J_A.T `nwl- -. `•.T- V I/a r
Shallot.te, North Carolina 28459 (919) 754-6324 =`=:.-.=_, DATE.
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DES I GN FLOWRATE = 20 .O CFS —'
---'--- RISER DIAMETER. . . . 3 FT.
RISER ELEVATION . . . 1 6 . 1 FT .
- ' CULVERT DIAMETER . . , 2 FT .
CULVERT LENGTH . . . . 40 FT .
• INVERT-IN 14 FT .
_ INVERT-OUT 13 . .FT
- --- TA I L.WATER ELEVATION . . . 0 FT . -_
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COMP'UTED WATER SURFACE ELEVATION BASED ON
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INLET CONTROL 16 .S0279 FT .
OUTLET CONTROL 1 EI . 10272 FT . -
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WEIR FLOW 16,
.7t;209 f=T .
HIGHEST ELEVAT I ON COMPUTED I S THE ACCEPTED ELEVAT I ON .
( IF KNOWN TAILWATER SUBMERGES OUTLET , IGNORE
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DONE 'S FORD WET DETENTION POND
DON C . 9/5/91
VOLUME OF RUNOFF FROM 1 INCH RAINFALL : 10500 CF
STORM WATER REALEASE METHOD : ORIFICE
ELEVATION OF NORMAL POOL (BOTTOM OF ORIFICE) : 15 FT . MSL
DIAMETER OF ORIFICE : 1 .5 IN .
SURFACE AREA OF POND AT NORMAL POOL : 9450 SO . FT
ELEVATION OF POOL AT DESIGN STORAGE : 16 . 1 FT . MSL
TIME INCREMENT FOR ROUTING: 2 HR .
TIME ELEV . HEAD FLOWRATE TYPE FLOW VOLUME END ELEV
_? 16 . ]. 1 . 1 .06 19413 ORIFICE 445 .9774 16 .05281
2 16 .05251 1 .052807 6 .059799E-02 ORIFICE 436 .3055 16 .00664
4 16 .i _6f:4 1 .001;63s 5.92543E E-02 ORIFICE 426 .6315 15 .96149
F. 15 .96149 .9614906 5 .791059E-02 ORIFICE 416 .9548 15 .91757
in 15 .91737 .9175679 5 .656603E-02 ORIFICE 407 .2754 15 .87427
1015 .87427 .8742695 c .52 2129E-=c ORIFICE 397 .5932 15 .8322
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� 15 .8322 .u,=, 1'a5� L�.a� rF'.1aE-�?� ORIFICE 387 .9035 15 .79115
14 15 .791 15 .7911473 5 .255062E-02 ORIFICE 378 .2205 15 .751 12
7c 35 c + n 368.5294
1.F, 15 .75112. r_�1 12ti:, •_� . y 1�r?f=�k•E-•C?2 ORIFICE 15 .71213
58 n3n 35' SSS
1,:_; 15 . 71213 r 1212L�,� 4 .'�v.�.�1'�E-i=?2 ORIFICE ,�•_�:1 .:.�.-.,�_� 15 .67415
20 15 .67415 .6741543 4 .849127E-02 ORIFICE 349 . 1371 15 .63721
22 15 .63721 .637209 4 .714353E--02 ORIFICE 339 .4356 15 .60129
24 15 .60129 .6012898 .57 9 5 8 2 - 0L U I C _ 329.7299 15 .5664
�1 E 320 .02
26 15 .5664 .5663977 4 .4447r_�F--t i2 ORIFICE 15 .53253
2n i r .592 5�, .5325327 r .n t9799E-r2 ORIFICE 31 C .:i5_ _ 15 .4997
30 15 .4997 .4- =N•.=c r .0417481 ORIFICE 3 .5 8 6 a 15 .4673q
32 15 .4E 789 .4673:879 4 .039752E--02 ORIFICE 290 .8621 15 .4 /1 1
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36 1 5 .4.0786 .1073591 3 .769403E 02. ORIFICE 271 .397 1 .3 ?8r'4
32 15 .3734 . . r 2E.338 OR:I F .. ,6 .G 75 L 5 .350`7.
-'_! _,509502 .'1_.:498 ;' OF:`i.F' I L.
44 15 .29867 .2986689 3 .227594E-02 ORIFICE 232 .3868 15 .27408
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46 , 15 .27408 .2740774 3 .091865E-02 ORIFICE 222 .6143 15 .25052
48 15 .25052 .2505207 2 .956009E-02 ORIFICE 212 .8326 15 .228
50 15 .228 .2279987 2.820007E-02 ORIFICE 203 .0405 15 .20651
52 15 .20651 .2065125 2 .683842E-02 ORIFICE 193 .2366 15 ' 18606
54 15 . 18606 . 1860638 2 .547504E-02 ORIFICE 183 .4203 15 . 16666
56 15 . 16666 . 1666546 2 .410974E-02 ORIFICE 173 .5901 15 . 14829
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58 15 . 14829 . 1482849 .0227422 ORIFICE 163 .7438 15 . 13096
60 15 . 13096 . 1309576 .0213722 ORIFICE 153 .8799 15 . 11467
62 15 . 11467 . 1146736 1 .999934E-02 ORIFICE 143 .9952 15 .09944
64 15 .09944 9 .943581E-02 1 .862324E-02 ORIFICE 134 .0874 15 .08525
66 15 .08525 8 .524704E-02 1 .724343E-02 ORIFICE 124 . 1527 15 .07211
68 15 .07211 7 .210923E-02 1 .585913E-02 ORIFICE 114 . 1857 15 .06003
70 15 .06003 6 .002617E-02 1 .446952E-02 ORIFICE 104 . 1806 15 .049
72 15 .049 .0490017 1 '307343E-02 ORIFICE 94 . 12868 15 .03904
74 15 .03904 3 .904057E-02 1 . 166922E-02 ORIFICE 84 .01841 15 .03015
76 15 .03015 3 .014946E-02 1 .025472E-02 ORIFICE 73 .83396 15 .02234
78 15 .02234 2 .233601E-02 8 .826462E-03 ORIFICE 63 .55052 15 .01561
80 15 .01561 .0156107 7 .378958E-03 ORIFICE 53' 1285 15 .00999
82 15 .00999 9 .988785E-03 5 .902558E-03 ORIFICE 42 .49842 15 '00549
84 15 .00549 5 .491257E-03 4 .376428E-03 ORIFICE 31 .51028 15 .00216
86 15 .00216 2 . 157211E-03 2 .743028E-03 ORIFICE 19 .7498 15 .00007
88 15 .00007 6 .67572E-05 4 .825397E-04 ORIFICE 3.474286 14 .9997
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Houston and Associates, P.A. JOB 1.)--4H0'J ? rn(
SUBJECT 4.,),.-0- ).,°*!..-lie. '.> a
CONSULTING ENGINEERS SHEET NO. OF
4918 Main Street Post Office Box 2927 CALCULATED BY (- e DATF `7/s/51
Shallotte, North Carolina 28459 (919) 754-6324 CHECKED BY DATE
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CONSULTING ENGINEERS
4918 lhuin Siroot Post []ffico 8ox 202T ����-'-^-z T= �
Shulloiie, North Carolina 28459 (9I9) 754'6324
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| PROJECT I .D . r JONE 'S FORD RISER CAPACITY A HEADWATER @ 17 ~3 ' �—
'T
. DESIGN, FLOWRATE = 23 CFS |
—� RISER DIAMETER . ' � . 3 FT ^ |
.
-- L
RISER ELEVATION . . . 16 . 1 FT . |
CULVERT DIAMETER . . . 2 FT .
-- CULVERT LENGTH. . . . 40 FT . -
--
'
._` INVERT-IN . . . 14 FT .
� INVERT-OUT 13 .5 FT . - --
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. _
—'� TAILWATER ELEVATION . . . 0 FT .
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--' _
� COMPUTED WATER SURFACE ELEVATION BASED ON :
—� INLET CONTROL 17 .31424 FT . '
— OUTLET CONTROL 16 .50066 FT . —
--` WEIR FLOW 16 .81957 FT . _
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HIGHEST ELEVATION COMPUTED IS THE ACCEPTED ELEVATION .
( IF KNOWN TAILWATER SUBMERGES OUTLET , IGNORE
''- INLET CONTROL VALUES ' )
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