20081832 Ver 1_Emails_20100624

Lucas, Annette
From: Levitas, Steve [[e-mail]]
Sent: Thursday, June 24, 2010 7:26 AM
To: Lucas, Annette
Subject: SE 40
Attachments: Exist Conveyance Pre vs Post Velocity Calcs.pdf
Follow Up Flag: Follow up
Flag Status: Flagged
Annette -- I am attaching calculations from Gary McCabe showing that the runoff from Lot 9 development enters the buffer
via the pre-existing conveyance at non-erosive velocity. Is that what you are looking for? If not, please let me know what
additional information you require. Thanks. Steve

Steven J. Levitas
Kilpatrick Stockton LLP
Suite 400
3737 Glenwood Avenue
Raleigh, NC 27612
t 919 420 1707
f 919 510 6145
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***DISCLAIMER*** Per Treasury Department Circular 230: Any U.S. federal tax advice contained in this communication (including any attachments) is not
intended or written to be used, and cannot be used, for the purpose of (i) avoiding penalties under the Internal Revenue Code or (ii) promoting, marketing or
recommending to another party any transaction or matter addressed herein.
1
Exist. Conveyance (Pre-Dev. QIO)
Worksheet for Triangular Channel
Project Description _
Project File C:\.haestad\.fmwlsoutheas.fm2
Worksheet Restored Conveyance
Flow Element Triangular Channel
Method Manning°s Formula
Solve For Channel Depth
Inert Data
Mannings Coefficient n.430
Channel Slope 0 `' . r_ ff f
Left Side Slope 15,000'00 H : V
Right Side Slope 15,000000 H : V
Discharge 11.72 cfs
Re _, . !
U ft
F Area 6 89 ft'
,t,eJ Perimeter 20,38 ft
Tr, Width 20,34 #t
Critical Depth 0,52 ft
Critical Slope 0.0200 10 ftf tt
Velocity 1.74 ftts
Velocity Head 0.04 ft
Specific Energy C9. 72 it
Fronde Number 0.51
Flow is subcritical.
Cross Section - Exist. Conveyance (Pre-Qev.- Q10)
Cross Section for Triangular Channel
Project Description
Project File c thaestad'tfmwlsoutheas_fm2
Worksheet Restored Conveyance
Flow Element Triangular Channel
Method Manning's Formula
Solve For Channel Depth
Section Data
Mannings Coefficient 0030
Channel Slope 0,005000 ft/ft
Depth 0 (38 ft
Left Side Slope 15 000000 H : V
Right Side Slope 15.000000 H V
Discharge 1172 cfs
0.68 ft
1
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M1
NTS
Exist. Conveyance (Post-Dev. Q1o)
Worksheet for Triangular Channel
Project Description
Project Pile cltiaestaci'lfrTiw,,s(.,,utheas.fm2
Worksheet Restored Conveyance
Flow Element Triangular Channel
Method Manning's Formula
Solve For Channel Depth
Input Data
_
?Mannings Coefficient-- 0030
--
Channel Slope 0 00,5000 ft'ft
t_eft Side Slope 15 ONIOt,)(7 H V
Right Side Slope 15.000000 N V
Discharge 21.56 cfs
C?esults
Depth 085 fl,
F' =roe Area 10,89 ft,
Perimeter 25 62 ft
T.,) Width 25-56 ft
( r(? al Depth 0-66 ft
Sf, pe 0,019003 ft/ft
Vein:: tv 1 98 ft/s
Vel , ly Head 0 06 ft
Specific Energy 0.91 ft
Froude Number 0.53
Flow is subcritical.
Cross Section - Exist. Conveyance (Post-Dev.- Q10)
Cross Section for Triangular Channel
Project Description
Project File cAhaestad',fm4vlsoutheas.fm2
Worksheet Restored Conveyance
Flow Element Triangular Channel
Method Manning's Formula
Solve For Channel Depth
Section Data
Mannings Coefficient U30
Channel Slope 0,005000 ft/ft
Depth 0.85 ft
Left Side Slope 15.000000 H : V
Right Side Slope 15.000000 H V
Discharge 21.56 cfs

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