SW8051108_COMPLIANCE_20060511

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW
DOC TYPE
❑CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
FPCOMPLIANCE EVALUATION INSPECTION
DOC DATE
�DS"//
YYYYMMDD

WET DETENTION POND ANALYSIS
FILE NAME
PROJECT # SW8 051108
PROJECT NAME White Oak River Investments
S 1WQSIPOND1051108 WK1
REVIEWER r hail
DATE 11-May-06
Receiving Stream Little Northeast Creek Class C, NSW
Drainage Basin White Oak Index No 19-16-2
Site Area 2 06 acres
Drainage Area square feet Area in Acres 206
IMPERVIOUS AREAS Rational C
Buildings 10741 00 square feet
Streets 3859900 square feet
Sidewalks 43300 square feet
square feet
square feet
square feet
square feet
TOTALF;fr square feet Rational Cc= 009
SURFACE AREA CALCULATION
% IMPERVIOUS 55 44%
Des Depth 4
TSS
SA/DA Ratio 3 57%
Req SA 3207 sf
Prov SA .470'�%75 sf
VOLUME CALCULATION * place a "I" in the box if Rational is used
Rational'?*
Des Storm
1,Op
inches
Rv=
0 549
Bottom
90 msl
Perm Pool
94,00 msl
Design Pool
95 msl
Storage met @elev 94 87 msl
Req Volume
4107
cf
Vol Prov at DP
4T02cf
ORIFICE CALCULATION
Avg Head =
Flow Q2, cfs
Flow Q5, cfs
No of Orifices
Diameter, inches
Drawdown =
048 ft
0 024 cfs
0 010 cfs
"1
1 tQ weir H x W
2 6 1 days
C 3 317916667
FOREBAY
Perm Pool Volume=
6702
Req Forebay Volume=
13404
Provided Volume=
139400
Percent=
€awk!";
Elevation Area
Inc Vol Acc Vol
9400 387400
000
9500 553000
470200 470200
Q2 Area = 1 03
Q5 Area = 041
Orifice Area 079
Q= 0 018
in x
Surface Area @DP =
Falling Head Drawdown =
L= -0 096
COMMENTS
Surface Area , Volume and Orifice are within Design Guidelines
sq inches
sq inches
sq inches
cfs
in
5530 sq ft
4 1 days

—Oceanside
Engineering & Surveying
539 Doer Creek Drive, Cape Carteret, NO 28584 Phone [phone] Fax [phone]
23 March 2006
NORTH CAROLINA DEPARTMENT OF ENVIROMENT AND NATURAL RESOURCES
WATER QUALITY SECTION STORMWATER
127 CARDINAL DRIVE
WILMIMGTON, NC 28405
910-796-7215
REFERENCE WHITE OAK RIVER INVESTMENT (PROJECT NO SW8 051108)
Dear Ms Hall
1 have finally gotten the letter from the Corp of Engineers on this project Ther is no
wetland on this project and the stream is not a blue line stream
I have adjusted the pool to increase the forebay to twenty (20%) percent as required I
have changed the data on the WET DETENTION BASIN SUPPLEMENT to reflect the new
data In addition I have revised the WET POND REQUIREMENTS
Thanks for all of you elp
Joseph F Dunnehoo PE/PLS
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15A NCAC 2B 0312 WHITE OAK RIVER BASIN
http //h2o ehnr state nc us/strmclass/hydro/whiteoak html
EHNR — ENVIRONMENTAL MANAGEMENT
031.2 WHITE OAK RIVER
BASIN
Name of Stream
Description
Class
NEW RIVER DRAINAGE AREA
------------------------
NEW RIVER
From
source to Blue Creek
C NSW
Cowford Branch
From
source to New River
C NSW
Squires Run
From
source to New River
C NSW
Mill Swamp
From
source to Squires Run
C NSW
Cowhorn Swamp
From
source to New River
C NSW
Juniper Swamp
From
source to Cowhorn Swamp
C NSW
Bear Proaq
From
source to Cowhorn Swamp
C NSW
Margaret Branch
From
source to Cowhorn Swamp
C NSW
Jenkins Swamp
From
source to Cowhorn Swamp
C NSW
Bachelors Delight Swamp
From
source to New River
C NSW
Huffmans Branch
From
source to Bachelors Delight Swamp
C NSW
Hewitts Branch
From
source to Bachelors Delight Swamp
C NSW
Half/Moon Creek
From
source to New River
C NSW
NEW �IVER
From
Blue Creek to U S Hwy 17
SB NSW
bridge
Blue Creek
From
source to New River
SC NSW
Little Creek
From
source to New River
SC NSW
Mill Creek
From
source to New River
SC NSW
Deep Gully Creek
From
source to Mill Creek
SC NSW
(Elizabeth Lake)
Socoe Creek
From
source to Mill Creek
SC NSW
~ Chainey Creek
From
source to New River
SC NSW
Sandy Run Branch
From
source to Chainey Creek
SC NSW
Burnt House Branch
From
source to Chainey Creek
SC NSW
NEW RIVER
From
U. S.Hwy 17 bridge to
SB HQW NSW
Atlantic Coast Lane Railroad
Trestle
NEW RIVER
From
Atlantic Coast Line Railroad
SC HQW NSW
Trestle to Mumford Point
Brinson Creek
From
source to New River
SC NSW
Edwards Creek
From
source to New River
SC HQW NSW
Strawhorn Creek
From
source to Edwards Creek
SC HQW NSW
Wilson Bay
Entire Bay
SC HQW NSW
Stick Creek
From
source to New River
SC HQW NSW
NEW RIVER
From
Mumford Point to a line
SC NSW
extending across the river from
Grey
Point to point of land
approximately 2200 yards downstream
from
mouth of Duck Creek
Northeast Creek
From
source to N. C Hwy 24
SC NSW
Wolf Swamp
From
source to Northeast Creek
C NSW
Little Northeast Creek
From
source to Northeast Creek
C NSW
Horse Swamp
From
source to Little Northeast Creek
C NSW
Rocky Run
From
source to Little Northeast Creek
C NSW
Poplar Creek
From
source to Little Northeast Creek
C NSW
Mott Creek
From
source to Northeast Creek
C NSW
Northeast Creek
From
N C. Hwy.24 to downstream-
SC HQW NSW
side
of mouth of Scales Creek
` Scales Creek
From
source to Northeast Creek
SC HQW NSW
Northeast Creek
From
the downstream side of mouth
SC NSW
of Scales Creek to New River
1 of 10
7/25/00 3 32 PM