HomeMy WebLinkAboutSW8000635_COMPLIANCE_20001004STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO. SW
DOC TYPE ❑CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE'
COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYMMDD
0 2000
STROUD ENGINEERING, P.A.
CONSULTING ENGINEERS
3961-A MARKET STREET
WILMINGTON, NC 28403
(910) 815-0775
October 4, 2000
NCDENR
Attn, Linda Lewis
127 Cardinal Drive Est.
Wilmington, NC 28405-3845
Re: Storalwater Project #SW8 000635
The Commerce Center 0 Riverside
Dear Linda,
I am writing in response to your fax inquiry made September 20, 2000 concerning the determination of
off -site drainage areas at the aforementioned project. The areas delineated as contributory off -site drainage areas
are proposed for development vvithin the scope of this project. I am including, by attachment to this letter, an
illustrative of the subject area. This illustrative also shows existing and proposed elevations for the off -site area.
The existing elevations are somewhat irrelevant given that the area will be graded according to the proposed
elevations. The offsite area North of the property is the improvement of Old Bridge Street. The termination of
the off-ste area here is the centerline of the road which will be crowned from this point to each side. This entire
road improvement in front of and adjacent the site was considered to be off -site drainage. The area West of the
project will be constructed to mutually benefit both the adjacent property and The Commerce Center. This area
will be graded in accordance with the plan to route runoff from this area into the pond. The owner of the adjacent
land will be making application for an offsite system to serve these proposed improvements,
I hope that this inforniation and attachment is adequate for your continued review of this project. If I can
be of any further assistance with this project, please feel free to call or fax nie.
Attachment
J H Flrj
i i le: F:1M aster\P W 2401W P Dl Lewis2.wpd
107 COMMERCE ST.
SUITE B
GREENVILLE, NC 27858
(252) 756-9352
hank You,
Jame H. Fentress, Jr. P
3961-A MARKET ST.
WILMINGTON. NC 28403
(910) 815-0775
HESTRON PLAZA TWO
151-A HWY. 24
MOREHEAD CITY, NC 28557
(252) 247-7479
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DETENTION POND ANALYSIS FILE NAME: S:1WQSIPOND1000635.WK1
PROJECT #: SW8 000635 REVIEWER:
PROJECT NAME: The Commerce Center @Riverside DATE: 26-Jul-2000
Receiving Stream: New River Class: SQHQWNSW Chlorides: nla
Drainage Basin: WHO Index No. 19-10.5
Site Area 4.87 acres
Drainage Area >212137 00:: square feet needs to be verified
Area in Acres 4.87 acres
IMPERVIOUS AREA Rational C-list beside
each item below in E15 to E20
Building
19274.00 square feet
Parking
76608.00 square feet
Walks
8854.00 square feet
Offsite
22406,00 square feet
square feet
square feet
TOTAL
127142'd0:
% IMPERVIOUS 59.93%
SURFACE AREA CALCULATION
(Adjoining 0.65 acre tract)
Cc=
Des. Depth 6.0 TSS:
Rational ?
SAIDA 2,60%
Req. SA 5509 square feet
Prov. SA 5540' square feet
VOLUME CALCULATION
Bottom
-3.00 MSL
Perm. Pool
300 MSL
Design Pool
4.60 MSL
Design SA
7497 square feet
Req. Volume
..:::10420;
cubic feet
Prov. Volume
'.............'..;1.0..430
cubic feet
ORIFICE CALCULATION
Flow Q2, cfs
Flow Q5, cfs
No. of Orifices
M
W
If Rational is used put a
"1" in box E26. If not, leave it blank.
[From plan Contours]
Perm. Pool Volume= 10756
Req. Forebay Volume= 2151.2
Provided Volume= 2127
Percent=
Des. Storm 00>, inches
Rv= 0.5894052
SA @ _
Elevation=
Avg. Head = 0.77 ft
0.060 Area, in 2.06
0.024 Area, in' 0.82
Diameter, in. Area = 1.767 in'
Q, cfs = 0.052 Drawdown = `2 3 days
COMMENTS
Surface Area , Volume and Orifice are within Design Guidelines.