SW7060304_HISTORICAL FILE_20060327

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
DOC TYPE
❑CURRENT PERMIT
❑ APPROVED PLANS
HISTORICAL FILE
DOC DATE
YYYYMMDD

Drainage, Stormwater, andErosion &
Sediment Control Calculations
MAR 0 2 Z006
Tanglewood SubdlvTj °`��L)v Jbi D
��' "�O
MAR Z 7 2006
DWQ
Elizabeth City, Norte___ _ ______
Prepared for Tanglewood 5F Partners, LLC
116 Landmark Square, Suite 102
Virginia Beach, Virginia 23452
757-491-1962
Prepared by VHBIVanasse Hangen Brustlin, Inc.
Transportation, Land Development, Environmental Services
5544 Greenwich Road, Suite 302
Virginia Beach, Virginia 23462-6563
757-490-0132
tee;: FEssto. <i,7,
..0271
-
• C� Z.
8000000SO

on
®March 27, 200b
lwvssc._HtuIgertl3usstiin,lnc._
Name of BMP: B
General Calculations
Description
Quantity AC
Total Area
34.92
Tot Area
0
Residential Lots 10k
67
Residential Lots 15k
0
Communit Center Area
0
Park Area
1,16
Roads & Sidewalks
5.98
Impervious Areas =
11.60
Percent Impervious Area (%)=
33.2
Required Surface Area of Permanent Pool
Description Quantity Unit
Pool Depth T5 FT
SAIDA 0.90 Provided
Surface Area of Pool= 0.31 AC 0.77 AC
Surface Area of Pool= 13,632 SF 33402 SF
P:132157.00\ssheetslBMP Calculations 2-22-06.xis
RECEIVED
MAR. 2 l 2006
DWQ
FR9d #

Name of BMP: B
Lots to this Drainage Basin
Max
Allowable
Impervious
Total
Number of
Area per
Impervious
Residential Lots
Lots
Lot
Area
10,000 SF 15,000 SF
10,000 SF
67
3,500 SF
5.38
1-13 none
15.000 SF
0
4,500 SF
0.00
115-131
5,38
138-162
166-177
Park/Tot area
Park 1.16
20%
0.23 hj �, s�
Community Center 0
40%
0.00
Tot Lot 0
20%
0.00
0.23
Roads/sidewalk
5,98
Total
11,60
P:132157.001ssheetslBMP Calculations 2-22-06,xls
RECYTVLED
MAR 2.7 2006
DWQ
pRO.T #

March 27, 2006
y,auasSe ffj2-nL*n )7rzictlin, Mc. —
Name of BMP: C
General Calculations
Description
Quantity AC
Total Area
52.59
Tot Area
0.31
Residential Lots 10k
38
Residential Lots 15k
56
Community Center Area
2.41
Park Area
0
Roads & Sidewalks
8.24
Im envious Areas =
18.10
Percent Impervious Area (%)=
34.4
Required Surface Area of Permanent Pool
Description Quantity Unit
Pool Depth 7.5 FT
SAIDA 0.93 Provided
Surface Area of Pool= 0.49 AG 1.32 AC
Surface Area of Pool= 21,368 SF 57,671 SF
ption
(volume= I 1.581AC'FT I weir elevation 10.63 1
ume=
P;132157.001ssheetsWMP Calculations 2-22-06.xIs

Name of BMP: C
Lots to this drainage Basin
Max
Allowable
Impervious
Total
Number of
Area per
Impervious
Residential Lots
Lots
Lot
Area
10,000 SF 15.000 SF
10,000 SF
38
3,500 SF
3.05
14-22 23-43
15,000 SF
56
4,500 SF
5.79
132-137 67-101
8.84
178-181
Parkrrot area
201.203
Park 0
20%
0.00 uu ��
255-270
Community Center 2.41
40%
0.96 h 'S V S
Tot Lot 0.31
20%
0.06 062 p
1.03
Roadstsidewalk
8.24
Total
18.10
1, -q-zlvED
MAR 21 10
P:132157.001sshee151BMP Calculations 2-22-06.xls
DW Q
pg0S #

March 27, 2006
_Yanassel3'an&,enl3rustlin,lnc.—
Name of BMR D
General Calculations
Descri lion
Quantity AC
Total Area
39,45
Tot Area
0.22
Residential Lots 10k
95
Residential Lots 15k
0
Community Center Area
0.00
Park Area
0.72
Roads & Sidewalks
7.19
Impervious Areas =
15.01
Percent Impervious Area (%)=
38.05
Re uired Surface Area of Permanent Pool
Description Quantity Unit
Pool Depth 7.5 FT
SAIDA 1,04 Provided
Surface Area of Pool= 0.41 AC 1.08 AC
Surface Area of Pool= 17.898 SF 47,127 SF
IRv= I 0.3911NIIN I Provided
2 i werelevatFn 1u.e3oue= 0CvVowmme= 2Cr
R\32157.061ssheetsLBMP Calculations 2-22-06.xls

Name of BMP: D
Lots to this Drainage Basin
Max
Allowable
Impervious
Total
Number of
Area per
Impervious
Residential Lots
Lots
Lot
Area
10.000 SF 15,000 SF
10,000 SF
95
3,500 SF
7.63
163-165 none
15,000 SF
0
4,500 SF
0.00
182-200
7.63
204-254
Park/Tot area
271-293
Park 0.72
20%
0.14 Ao b J }fix
Community Center 0
40%
0.00
Tot Lot 0.22
20%
0,04
0,19
Roads/sidewalk
7.19
Total
15.01
Vacs IV
�w
P:132157.001ssheets\BMP Calculations 2-22-06.xls

1 MarCh 27, 2006
_vaulass�tla�x�rn —Inc—
Name of BMP: E
Generat Calculations
Description
Quantity AC
Total Area
22.49
Tot Area
0.00
Residential Lots 1 Ok
0.00
Residential Lots 15k
36.00
Community Center Area
0,00
Park Area
0,00
Roads & Sidewalks
2.30
Impervious Areas =
6.02
Percent Impervious Area (%)=
26.76
Required Surface Area of Permanent Pool
Description Quantity Unit
Pool Depth 7,5 FT
SAIDA 0.74 Provided
Surface Area of Pool= 0.17 AC 0,78 AC
Surface Area of Pool= 7,203 SF 33,915 SF
Required Volume to Control 1" Storm
Description Quantity Unit
Rv= 0.29 WIN Provided
Volume= 0.55 ACTT Weir elevation 10.22
Volume= 23,746 CIF 25,200 CIF
P:132157.00kssheetslBMP Calculations 2-22-06.xis

Name of BMP: E
Lots to this Drainage Basin
Max
Allowable
Total
Number
Impervious
Impervious
Residential Lots
of Lots
Area per Lot
Area
10,000 SF 15,000 SF 10,000 SF
0
3.500 SF
0.00
44-66 15,000 SF
36
4,500 SF
3,72
102.114
3.72
Park/Tot area
Park 0
20%
0.00
Community Center 0
40%
0,00
Tot Lot 0
20%
0.00
0.00
Roads/sidewalk
2.3
Total
6,02
P.132157,001ssheets%BMP Calculations 2-22-06.xls

ws Area Summary
Lot 4
Max
Impervious
Area
151
3,500 SF
152
3,500 SF
153
3,500 SF
154
3,500 SF
155
3,500 SF
156
3.500 SF
157
3,500 SF
158
3,500 SF
159
3.500 SF
160
3,500 SF
161
3.500 SF
162
3.500 SF
163
3.500 SF
164
3.500 SF
165
3,500 SF
166
3,500 SF
167
3,500 5F
168
3.500 SF
169
3,500 SF
170
3,500 SF
171
3.500 SF
172
3.500 SF
173
3.500 SF
174
3,500 SF
175
3.500 SF
176
3.500 SF
177
3,500 SF
178
3,500 SF
179
3.500 SF
180
3,500 5F
181
3.500 SF
182
3,500 SF
183
3.500 SF
184
3.500 SF
185
3.500 SF
186
3.500 SF
187
3.500 SF
188
3.500 SF
189
3,500 SF
190
3,500 SF
191
3.500 SF
192
3,500 SF
193
3,500 SF
194
3,500 SF
195
3.500 SF
196
3,500 SF
197
3,500 SF
198
3,500 SF
199
3,500 SF
200
3,500 SF
n-ECEqVEV1-j-*-
MAR 2 7 2006
DWQ.
PROD #
P;M157.0013sheetsl9MP Calculations 2-22-06.xls

Orifice Sizing - Average Hydraulic Head Method - DCR Method #2
BMP B
Actual WQV Required for BMP= 44250 cf
Water Surface Elev. © WQV = 10.73 feet
Invert of Drawdown Orifice = 9.50 feet
Head Available = 1.23 feet
Required Drawdown Time = 72 hours
Average Flow (Qavg) = 0.17 cfs
Orifice Coefficient = 0.6
Orifice Area Required = 0.03 sf
Orifice Size Required = 2.0 inches
RECEIVED
MAR 0 2 2006
DWQ
FROJ #

Orifice Sizing - Average Hydraulic Head Method - DCR Method #2
BMP C
Actual WOV Required for BMP=
68700
cf
Water Surface Elev. @ WQV =
10.63
feet
Invert of Drawdown Orifice =
9.50
feet
Head Available =
1.13
feet
Required Drawdown Time = 72 hours
Average Flow (Qavg) = 0.27 cfs
Orifice Coefficient = 0.6
Orifice Area Required = 0.05 sf
Orifice Size Required = 3.0 inches

Orifice Sizing - Average Hydraulic Head Method - DCR Method #2
BMP D
Actual WQV Required for BMP= 56225 cf
Water Surface Elev. Q WQV = 10.65 feet
Invert of Drawdown Orifice = 9.50 feet
Head Available = 1.15 feet
Required Drawdown Time = 72 hours
Average Flow (Qavg) = 0.22 cis
Orifice Coefficient = 0.6
Orifice Area Required = 0.04 sf
Orifice Size Required = 2.5 inches

Orifice Sizing - Average Hydraulic Head Method - DCR Method #2
BMP E
Actual WOV Required for BMP= 25200 cf
Water Surface Elev. Q WQV = 10.45 feet
Invert of Drawdown Orifice = 9.50 feet
Head Available = 0.95 feet
Required Drawdown Time = 72 hours
Average Flow (Qavg) = 0.10 cfs
Orifice Coefficient = 0.6
Orifice Area Required = 0.02 sf
Orifice Size Required = 1.5 inches

Fj
TRANSMITTAL
1-ransponaiion 5544 Greenwich Road, Slate 302
Land Development Virginia Beach, Virginia 23462
FnvironmcntalServien Telephone [phone]
Fax [phone]
To: Scott A. Vinson.
Environmental Engineer II
943 Washington Square Mall
Washington , NC 27889
We are sending you: ® Enclosed
❑ Shop drawings ❑ Prints ® Plans
® Other Sealed cover sheet for calculations
Date: 03-24-06
VHB
Project No.: 32157.00
Re: Tanglewood
❑ Under Separate cover via Regular Mail the following items:
❑ Diskettes ❑ Specifications ❑ Copy of Letter ❑ Change Order
copies
Date
No.
Description
2
2/23/06
Revised Stormwater Mangement Plans
" -":T:% 71W T1
ffim
These are transmitted as checked bellow:
❑
For approval
❑
❑
For your use
❑
®
As requested
❑
❑
For review and comment
❑
❑
Returned prints on loan to VHB
REMARKS:
Copy to: file
Approved as submitted
❑ Resubmit Copies for approval
Approved as noted
❑ Submit Copies for distribution
Return for corrections
❑ Return Corrected prints
For bids due
By: Scott R. Davis, P.F.

Lot Max Impervious Area Summary
Lot #
Max
Impervious
Area
,-'101'
k500SF':
102
4.500 SF 1
P103
4,500SF.
4,500'SF,,
105, 4;-
A,500'SF_-
t: 106 ,:
A.500 SFa?
107.
4;500 SF.
108
4.500 SF'
109
4,500 SF
,f,110,
4,500 SF,
1,cd 11'_;
4.500 SF,,
4.Al2'
4,500SF,.
,T '113" .
'4.500 SF
114', .
4.500 SF
115
3,500 SF
116
3,500 SF
117
3.500 SF
11 B
3,500 SF
119
3,500 SF
120
3,500 SF
121
3.500 SF
122
3.500 SF
123
3,500 SF
124
3,500 SF
125
3,500 SF
126
3,500 SF
127
3.500 SF
12B
3,500 SF
129
3,500 SF
130
3,500 SF
131
3,500 SF
132
3,500 SF
133
3.500 SF
134
3.500 SF
135
3,500 SF
136
3,500 SF
137
3,500 SF
138
3,500 SF
139
3,500 SF
140
3.500 SF
141
3,500 SF
142
3.500 SF
143
3,500 SF
144
3,500 SF
145
3,500 SF
146
3,500 SF
147
3,500 SF
148
3,500 SF
149
3,500 SF
150
3,500 SF
Lot #
Max
Impervious
Area
151
3,500 SF
152
3,500 SF
153
3,500 SF
154
3.500 SF
155
3.600 SF
156
3.500 SF
157
3.500 SF
158
3,500 SF
159
3,500 SF
160
3,500 SF
161
3,500 SF
162
3.500 SF
163
3.600 SF
164
3.500 SF
165
3,500 SF
166
3,500 SF
167
3.500 SF
168
3.500 SF
169
3,500 SF
170
3,500 SF
171
3,500 SF
172
3.500 SF
173
3.500 SF
174
3,500 SF
175
3,500 SF
176
3,500 SF
177
3.500 SF
178
3.500 SF
179
3.500 SF
180
3,500 SF
181
3,500 SF
182
3,500 SF
163
3.600 SF
184
3.500 SF
185
3,500 SF
186
3,500 SF
187
3,500 SF
188
3.500 SF
189
3,500 SF
190
3,500 SF
191
3.500 SF
192
3,500 SF
193
3,500 SF
194
3,500 SF
195
3,500 SF
196
3,500 SF
197
3.500 SF
198
3.500 SF
199
3.500 SF
200
3,500 SF
RECEIVED
MAR 2 7 2006
DwQ
PROD # _. .
P:132157.001ssheets\BMP Calculations 2-22-06,xis

Tanglewood SID
Subject: Tanglewood SID
From: Scott Vinson <Scott,[e-mail]>
Date: Tue, 21 Mar 2006 12:17:39 -0500
To: [e-mail], [e-mail]
Scott & Joseph,
I finished. my review of the project last Friday and was tied up all yesterday
in meetings & didn't get a chance to call or write. There are three things
I need to finish my review and to.make the application complete.
The items need to submitted to me by Monday, March 27 if at all possible.
First, I need 2 coees of sheets C-4 & C-5 revised to show the missing
pipe sections located at the corner of Lot 100 and in front of Lots
284-288. Also, label the Comm. Center area beside Pond C.
i will replace the copies in the set we will keep in our files and the one
that is stamped approved and mailed to Mr. Gregor.
Second, I need the impervious area breakdowns for each
Drainage Area to each Pond listed as shown on Page 2 of 4
of the SWU-101 application form found under Sec.I11, no. 6.
You gave me the overall, which I do need, but I also need the
breakdown of the 4 pond areas as listed in the tables.
(The calculations are not clear on overall area vs. impervious area breakdowns.)
Third, I need to know the impervious area that is assigned to
each lot for purposes of pond design and the need to have these
numbers in the permit requirements for recorded deed restrictions.
For example Lots 1-22 & 115-293 will be allowed "X" amount of impervious area
per lot & Lots 23-114 will be allowed "Y" amount of imp. area per lot.
I also need to know how much of the 2.41 acres of the Community Center area will
be impervious, taken into account the 18.10ac. total imp. area for Pond C.
(Again, the calculations don't differentiate between what is overall area and what
is impervious area.)
Will either of the 2 "Tot" or "Park" areas have impervious area and if so,
do Ponds B, C & D take these areas into account in their design?
Please call or write if you have any questions, [phone].
Scott Vinson
l of 1 3/21/2006 1:17 PM

February 7, 2006
—Van ��e�c�22��cn1�r_�s��r�;_Inc.
Name of BMP: S
General Calculations
Description
Quantit (AC)
Total Area
34.92
Tot Area
0
Residential Lots (10k)
67
Residential Lots (15k)
0
Community Center Area
0
Park Area
1.16
Roads & Sidewalks
5.98
Impervious Areas =
11.60
Percent Impervious Area (%)=
33.2
? RECEIVED
iokCa 3653,9/tA MAR 021006
DWQ
PROD #
Required Surface Area of Permanent Pool
Description
Quantity
Unit
Pool Depth
7.5
FT
SA/DA
0.90
Provided
Surface Area of Pool=
0.31
AC
I 0.77
AC
Surface Area of Pool=
1 13,632
ISF I
33402
SF
Required Volume to Control 1" Storm
Description
Quantity
Unit
Rv=
0.35
MIN
Provided
Volume=
1.02
ACTT
Weir elevation 10.73
Volume=
44,220
CIF
44250 CIF
P:Q2157.001ssheets\BMP Calculations 2-22-06.xls

February 7, 2DD6
�cfSse F�era Rrustlin, Inc.
Name of BMP: C
General Calculations
Description
Quantity (AC)
Total Area
52.59
Tot Area
0.31
Residential Lots (10k)
38
Residential Lots 15k)
56
Community Center Area
2.41
Park Area
0
Roads & Sidewalks
8.24
,Impervious Areas =
18.10
Percent Impervious Area (%)=
34.4
Required Surface Area of Permanent Pool
Description
Quantity
Unit
Pool Depth
7.5
FT
SA/DA
0.93
Provided
Surface Area of Pool=
0.49
AC
1.32
AC
Surface Area of Pool=
21,368 1
SF
57,671
ISF
Required Volume to Control 1" Storm
Description
Quantity
Unit
Rv=
0.36
IN/IN
Provided
Volume=
1.58
ACTT
Weir elevation 10.63
Volume=
68,692
CF 1
68700 CIF
P:132157.00\ssheets\BMP Calculations 2-22-06.xls

Y�irzasse Haneen-Hr It n,__Inc.
Name of BMP: D
General Calculations
Description
Quantity (AC)
Total Area
39.45
Tot Area
0.22
Residential Lots 10k)
95
Residential Lots (15k)
0
Community Center Area
0.00
Park Area
0.72
Roads& Sidewalks
7.19
m ervious Areas =
I
15.01
Percent Impervious Area (%)=
38.05
February 7, 2006
Required Surface Area of Permanent Pool
Description
Quantity
Unit
Pool Depth
7.5
FT
SAMA
1.04
Provided
Surface Area of Pool=
0.41
AC
1.08
AC
ISF
Surface Area of Pool=
1 17,898
JSIF
47,127
Required Volume to Control 1 " Storm
Description Quantity Unit
Rv= 0.39 IN/IN Provided
Volume= 1.29 AC"FT Weir elevation 10.65
Volume= 56,202 CIF 56225 CIF
P:132157.00\ssheets\BMP Calculations 2-22-06.xls

® _k�trr.asse—Hctn ,en Brustlin,.Inc.
Name of BMP: E
General Calculations
Description
Quantity (AC)
Total Area
22.49
Tot Area
0.00
Residential Lots 10k)
0.00
Residential Lots (15k)
36.00
Community Center Area
0.00
Park Area
0.00
Roads & Sidewalks
2.30
Impervious Areas =
6.02
Percent Impervious Area (%)=
26.76
February 7, 2006
Required Surface Area of Permanent Pool
Description
Quantity
Unit
Pool Depth
7.5
FT
SA/DA
0.74
Provided
Surface Area of Pool=
0.17
AC
0:78
AC
Surface Area of Pool=
1 7,203
ISF
33,915
ISF
me uireo volume io uonirol 1" -jtorm
Description Quantity Unit
Rv= 0.29 MIN Provided
Volume= 0.55 ACTT Weir elevation 10.22
Volume= 23,746 CIF 25,200 CIF
P:132157.00\ssheets\BMP Calculations 2-22-06.xls

Pre Development Subcatchment Type 1124-hr'2-YR -Rainfall=3.90"
Prepared by Vanasse Hangen Brustlin, Inc. Page 1
HydroCAD© 7.12 s/n 001234 © 2005 HydroCAD Software Solutions LLC 2/3/2006 11:10:00 AM
RIME
Pond 1 P: Node
[401 Hint: Not Described (Outflow=Inflow)
Inflow Area = 196.800 ac, Inflow Depth > 1.66" for 2-YR event
Inflow = 26.96 cfs @ 19.68 hrs, Volume= 27.212 of
Primary = .26.96 cfs @ 19.68 hrs, Volume= 27.212 at, Atten= 0%, Lag= 0.0 min
Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs
Pond 1 P: Node
Hydrograph
• ��
oyv + r ! ! •
f'.
1
�MMJJI'/'
�XA"Y�J'JYJ'!
10 Inflow
11 Primary
gECEIVEI)
MAR 0 2 2006
DWQ
PROJ #

Pre Development Subcatchn-ent Type 1124-hr S-.YR Rainfall=5.40"
Prepared by Vanasse Hangen Brustlin, Inc. Page 2
HydroCADO 7.12 s/n 001234 © 2005 HydroCAD Software Solutions LLC 2/3/2006 11-.10:01 AM
YR+E �1sa.��.rr
Pond 1 P: Node
[40] Hint: Not Described (Outflow=Inflow)
Inflow Area = 196.800 ac, Inflow Depth > 2.86" for 5-YR. event
Inflow = 47.65 cfs @ 19.05 hrs, Volume= 46.965 of
Primary = 47.65 cfs @ 19.05 hrs, Volume= 46.965 af, Atten= 0%, Lag= 0.0 min
Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs
Pond 1 P: Node
Hydrograph
Inflow
:'
5 5s'.
,
Primary
a
law =196-100-aib-
45-
:.....:..........:.....:.....:.....:..
:
40-:
35
-- - - -- - -
30-
_ - - -
- --- - - --- - -
25-
'
20
:.... .....:.....'.....!
15
1
t
10
f
_.....E.....c....:.......
-
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48
Time (hours)

Pre Development Subcatchment Type 1124-hr 10-YR Rainfall=6.10"
Prepared by Vanasse Hangen Brustlin, Inc. Page 3
HydroCADO 7.12 s/n 001234 © 2005 HydroCAD Software Solutions LLC 2/3/2006 11:10:01 AM
Pond 1 P: Node
[401 Hint: Not Described (Outflow=Inflow)
Inflow Area =
196.800 ac,
Inflow Depth > 3.46"
for 10-YR event
Inflow =
57.94 cfs @
19.04 hrs, Volume=
56.756 of
Primary —
57.94 cfs @
19.04 hrs, Volume=
56.756 at, Atten= 0%, Lag= 0.0 min
Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.06 hrs
Pond 1 P: Node

Pre Development Subcatchment Type 1124-hr25-YRI Rainfall=7.20"
Prepared by Vanasse Hangen Brustlin, Inc. Page 4
HydroCADO 7.12 s/n 001234 @ 2005 HydroCAD Software Solutions LLC 2/3/2006 11:10:02 AM
Pond 1 P: Node
(401 Hint: Not Described (Outflow=Inflow)
Inflow Area = 196.800 ac, Inflow Depth > 4.43" for 25-YR event
Inflow - 74.61 cfs @ 19.03 hrs, Volume= 72.628 of
Primary = 74.61 cfs @ 19.03 hrs, Volume= 72.628 af, Atten= 0%, Lag= 0.0 min
Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs
Pond 1 P: Node

Pre Development Subcatchment Type 11 24-hr.'50-YR Rainfall=8.30"
Prepared by Vanasse Hangen Brustlin, Inc. Page 5
HvdroCADO 7.12 s/n 001234 @ 2005 HvdroCAD Software Solutions LLC 2/3/2006 11:10:02 AM
Pond 1 P: Node
[40] Hint: Not Described (Outflow=lnflow)
Inflow Area = 196.800 ac, Inflow Depth > 5.42" for 50-YR event
Inflow = 91.71 efs @ 19.01 hrs, Volume= 88.937 of
Primary = 91.71 cfs @ 19.01 hrs, Volume= 88.937 af, Atten= 0%, Lag= 0.0 min
Routing by Dyn-Stor-Ind method, Time Span= 0.00-48.00 hrs, dt= 0.05 hrs
'Z'
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--- --- --- --- --
Time (hours)
10 Inflow
0 Primary

Past Ddvelopment Final with Link 2-20-06 Type II 24-hr 90-YR Rainfall=6.10"
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HydroCAD® 7.10 sln 001234 © 2005 HydroCAD Software Solutions LLC
Pond BMP A: Pond #A
Hydrograph
4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60
Time (hours)
'DEC"WE"
MAR 0 2.2006
DWQ
PRO.I #

Post Development Final with Link 2-20-06 Type // 24-hr 10-YR Rainfall=6. 10"
Prepared by Vanasse Hangen Brustlin, Inc. (VHB) Page 2
HydroCAD@ 7.10 sin 001234 @ 2005 HydroCAD Software Solutions LLC
Pond BMP B: Pond #B
Hydrograph
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----j Inflow
L—.Primary

Post Development Final with Link 2-20-06 Type 11 24-hr 10-YR Rainfall=6.10"
Prepared by Vanasse Hangen Brustlin, Inc. (VHB) Page 3
HydroCAD®7.10 s/n 001234 ©2005 HydroCAD Software Solutions LLC
Pond BMP C: Pond #C
Hydrograph
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60
Time (hours)

Post Development Final with Link 2-20-06 Type 1124-hr 10-YR Rainfall=6.10"
Prepared by Vanasse Hangen Brustiin, Inc. (VHB) Page 4
HydroCAD(D 7.10 sln 001234 O 2005 HydroCAD Software Solutions LLC
Pond BMP D: Pond #D
0 2 4 6 8 10 U 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60
Time (hours)

Post Development Final with Link 2-20-06 Type II 24-hr 10-YR Rainfall=6.10"
Prepared by Vanasse Hangen Brustlin, Inc. (VHB) Page 5
H droCAD® 7.10 sln 001234 © 2005 H droCAD Software Solutions LLC
Pond BMP E: Pond #E
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Time (hours)

Post D6velopment Final with Link 2-20-06 Type// 24-hr 10-YR Rainfafi=6. 10"
Prepared by Vanasse Hangen Brustlin, Inc. (VHB) Page 6
HydroCADO 7.10 sin 001234 @ 2005 HydroCAD Software Solutions LLC
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Post D6velopment Final with Link 2-20-06 Type // 24-hr 10-YR Rainfall=6. 10"
Prepared by Vanasse Hangen Brustlin, Inc. (VHB) Page 7
HydroCAD@ 7.10 s/n 001234 @ 2005 HydroCAD Software Solutions LLC
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Time (hours)

Post Development Final with Link 2-20-06 Type It 24-hr50-YR Rainfall=8.30"
Prepared by Vanasse Hangen Brustlin, Inc. (VHB) Page 8
HydroCAD® 7.10 sln 001234 © 2005 HydroCAD Software Solutions LLC
Pond BMP A: Pond #A
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60
Time (hours)

Post Development Final with Link 2-20-06 Type II 24-hr 50-YR Rainfall=8.30"
Prepared by Vanasse Hangen Brustlin, Inc. (VHB) Page 9
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Time (hours)
— Inilow
— Primary

Post Development Final with Link 2-20-06
Prepared by Vanasse Hangen Brustlin, Inc. (VHB)
HvdroCAD@) 7.10 s/n 001234 @ 2005 HvdroCAD Software Solutions LLC
Type // 24-hr 50-YR Rainfall=8.30"
Page 10
Pond BMP C: Pond #C
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— Primary

Post Development Final with Link 2-20-06 Type 1124-hr50-YR Rainfall=8.30"
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Hydrograph
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Time (hours)
--- Inflow
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Post Development Final with Link 2-20-06 Type 1124-hr 50-YR Rainfall=8.30"
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F
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Post'Development Final with Link 2-20-06 Type 1124-hr50-YR Rainfall=8.30"
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HydroCADO 7.10 sln 001234 O 2005 HydroCAD Software Solutions LLC

f' y
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TRANSMITTAL
'rransponation 5544 Greenwich Road, Suite 302
Land Dcvdopment Virginia Beach, Virginia 23462
En,ironnnental Services Telephone [phone]
Fax [phone]
To: Scott A. Vinson.
Environmental Engineer II
943 Washington Square Mall
Washington , NC 27889
We are sending you: ® Enclosed
❑ Shop drawings ❑ Prints ® Plans
® Other Sealed cover sheet for calculations
Date: 2-27-06
VH E3
32157.00
Project o.: No.:
Re: Tanglewood
MAR 0 2 Z006
�q a
❑ Under Separate cover pia tR� Wa"r M'atl'thc4follb�ving items:
❑ Diskettes ❑ Specifications ❑ Copy of Letter ❑ Change Ordcr
Copies
Date
No.
Description
2
2/23/06
Erosion and Sediment Control and Stormwater Management Details (Sheet C-7, C-H)
1
Cover Sheet for Calaculations
These are transmitted as checked below:
❑
For approval
❑
❑
For your use
❑
®
As requested
❑
❑
For review and comment
❑
❑
Returned prints on loan to VHB
REMARKS:
Approved as submitted
Approved as noted
Return for corrections
For bids due
❑ Resubmit
Copies for approval
❑ Submit
Copies for distribution
❑ Return
Corrected prints
Copy to: file
By: Scott R. Davis, P.E.

cogs't'A.. sA/DA tzAnos
85% TSS REMOVAL,
30 FOOT VEGETATED FILTER REQUIRED
DEPTH
3'
3.5'
4.0'
4.5'
5.0'
5.5'
6.0'
6.5'
7.0'
7.5'
EAP %
10%
.9 1
.8
.7
.6
.5
0
0
0
0
0
20 %
1.7
1.3
1.2
1.1
1.0
.9
.8
.7
.6
.5
30 %
2.5
2.2
1.9
1.9
1.6
1.5
1.3
L 2
1-0
.9
40 %
3.4
3.0
2.6
2.4
2.1
1.9
1.6
1.4
1.1
1..0
50 %
.4.2
3.7
3.3
3.0
2.7
2.4
2 A
1.8
1.5
1.3
60 %
5.0
4,5
3.8
3.5
3.2
2.9
2.6
2.3
2.0
1.6
70 %
6.0
5.2
4.5
4.1
3.7
*3.3
2.9
2.5
2.1
1.8
80 %
6.8
6.0
5.2
4.7
1 4.2
3.7
3.2
2.7
2.2
2.0
90 %
7.5
6.5
5.8
5.3
4.8
4.3
3.8
3.3
2.8
1.3
it 100 %
8.2
7.4
6.8
6.2
5.6
L5.0
1 4.4
1 3.8
1 3.2
2.6
*;t-,-iwd 10/31/97
90% TSS REMOVAL
NO VEGETATED FILTER REQUIRED y
DEPTH
3'
3.5'
4.0'
4.5'
5.0
5.5'
6.0'
6.5'
7.0'
7.5'
RN4p%
1 0 %
1.3
1.0
.8
.7
1 .6
.5
.4
.3
.2
.1
20 %
2.4
2.0
1.8
L 7
1.5
1.4
1.2
1 1.0
.9
.6
3 0 %
3.5
3.0
2.7
2.5
2.2
1.9
1.6
1.3
1.1
.8 �
40 %
1 4.5
4.0
3.5
3.1
2.8
2.5
2 A
1.9
1.4
1.1 i
5 0 %
5.6
5.0
4.3
3.9
3.5
3.1
2.7
2.3
1.9
1.5
60 %
7.0
6.0
5.3
4.8
4.3
3.9
3.4
2.9
2.4
1.9
70 %
8.1
7.0
6.0
1 5.5
5.0
4.5
3.9
3.4
1 2.9
2-3
80 %
9.4
8.0
7.0
6.4
5.7
5.2
4.6
1 4.0
3.4
2.8
90 %
10.7
9.0
7.9
7.2
6.5
5.9
5.2
4.6
3.9
3.3
100 %
12.0
10.0
8.8
8.1
7.3
6.6
5.8
5.1
4.3
3.6
Now: The required surface area calculated from the tables is to be provided at the permanent pool elevation.
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