20070933 Ver 1_More Info Received_20070621

DIEHL & PHILLIPS, P.A.
CONSULTING ENGINEERS
219 East Chatham Street
Cary, North Carolina 27511
Telephone [phone] • Fax [phone]
June 21, 2007
401 Oversight/ Express Review Permitting Unit
Division of Water Quality
NC DENR
1650 Mail Service Center
Raleigh, NC 27699-1650
ATTN: Annette Lucas
Re: Revised Level Spreader Design for
Rose Hall Subdivision Phase 2
Wake County
Dear Annette:
WILLIAM C. DIEHL, P.E.
.TORN F. PHILLIPS, P.E.
ALAN R. KEITH, P.E.
Q~~~od~~
JUN 2 1 2007
UENR - WATcR QUALITY
Wf1UWDS aVD STOft4iYVATER BRANCH
Enclosed for your review are the following for the referenced project:
Revised Level Spreader Worksheet for Cadenza Lane road ditches
Revised Calculations for the Level Spreader
Sketch of Proposed Level Spreader and Bypass arrangement
Plan and Profile of Cadenza Lane at buffer crossing
Following our telephone discussions and meeting, we have revised the proposed diffuse
flow measures for Cadenza Lane in Phase 2 of Rose Hall. Please consider the enclosed
information in lieu of earlier submittals.
The 1-inch runoff from the road ditches from all four quadrants approaching the buffer
crossing on Cadenza Lane have been diverted to the southeast quadrant of the crossing
where a level spreader is proposed. The piping arrangement includes flow sputter
mechanisms using a rip rap sump and carefully sized pipes to control the 1-inch runoff .
Only the 1-inch storm runoff is directed to the level spreader. Larger flows are bypassed
to the road ditches on Cadenza Lane. We feel the proposed design meets your
requirements and we request your approval.

Should you have questions or require further information, please contact our office.
Sincerely,
Diehl & Phillips, P.A.
~~~~~
Alan R. Keith, P.E.
Enclosures
Cc: Rusty Ammons
Scott Mitchell

DIVISION OF WATER QUALITY -LEVEL SPREADER WORKSHEET (112007)
I. PROJECT INFORMATION (please complete the following information):
Project Name : Rose Hall Phase 2
Contact Person: Alan Keith, PE Phone Number: [phone] ext.25
Level Spreader ID: Lot 15
Level Spreader Length 32 ft. (perpendicular to flow)
Drainage Area 0.93 ac. (on-site and off-site drainage to the level spreader)
Impervious Area 0.18 ac. (on-site and off-site drainage to the level spreader)
Forebay Area 16 cu ft. (0.2% of the contributing impervious surface area)
Maximum Filter Strip/Buffer Slope 6 % (6% for forested/leaf littler cover, 8% for grass/thick cover)

Max. Discharge from 1"/Hr Storm 0.4 cfs
Max. Discharge to Level Spreader 0.4 cfs (Discharge rate from extended detention wetland or pond)
Filter Strip/ Zone 1 Buffer Vegetation forest (Grass/Thick ground cover or Forested)
Filter Strip/ Zone 1 Buffer Width 30 ft.
Filter Stripl Zone 2 Buffer Vegetation forest
Filter Stripl Zone 2 Buffer Width 20 ft.
Bypass Method Used flow splitter
Please include a worksheet for this.
II. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is
attached. If a requirement has not been met, please explain why. At a minimum, a complete stormwater management plan
submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet
structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete
submittal package will result in a request for additional information and will substantially delay final review and approval of
the project.
Applicants Initials
_~~L Project Site was visited prior to designing level spreader system. -.
~,~z; 5;~' ? ~ Date of the Site visit. Please attach time-dated digital photos of existing buffer conditions.
~~[- Level spreader length is at least: 13 ft. per cfs for thick ground cover /grass; OR 65 ft per cfs for 50-
footcanopied forest with leaf litter; 50 ft per cfs for 100-foot forested buffer; 40 ft. per cfs for 150-foot
forested buffer; OR a weighted average of the two vegetation types within the bufferlfilter strip).
/~~,/~ All ground cover types and their widths have been labeled on the construction plans.
6a~ ~ All contours have been depicted on the construction plans.
6C.~.1~ No structures are located in protected buffers (must meet no practical alternatives criteria).
/,~.~.1.~ No draws are located in the buffer or filter strip in the vicinity of the proposed level spreader.
~r,.ac. Construction details for the level spreader have been provided.
aq? ~~, The operation and maintenance agreement signed and notarized by the responsible party is provided.
l~/,,~ No practical alternatives explanation + Variance request. (Level Spreaders in Series only).
Bypass method used:
rgn.J~ Bypass conveyance method is specified and construction details and calculations are provided.
r'~/~, Alternative design option is specified and plan details and calculations are provided.
~n1~ Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the
bypass discharge.
~9rt,/~ Construction details for the bypass and outlets are provided. ~ ~-`~ ~J ,~ p ~~
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MAN-MADE CHANNELS
VARIABLES LIST:
Y - FLOW DEPTH B - CHANNEL BOTTOM WIDTH
Q - FLOWRATE M - CHANNEL SIDE SLOPE
VARIABLE TO BE SOLVED (Y,Q,B,M,S OR N) ? Y
Q (CFS) ? 1.1 RESULTS

M (FT/FT) ? 2.5 Y= 0.30 FT
S (FT/FT) ? .l A= 0.22 SF
N (FT~1/6) ? .025 P= 1.60 FT
V= 5.00 FPS
F= 2.29
S - CHANNEL SLOPE
N - CHANNEL ROUGHNESS
SUPER-CRITICAL FLOW
<Shift> <Prt Sc> print <Return> repeat <Space Bar> back to menu
-------------------------------------------------------------------------------
C~~~NZ~c ~-rA 3~~3o za `~ c~.~v
so u-~ w ~r ~ C~ ~~,~
MAN-MADE CHANNELS
VARIABLES LIST:
Y - FLOW DEPTH B - CHANNEL BOTTOM WIDTH
Q - FLOWRATE M - CHANNEL SIDE SLOPE
VARIABLE TO BE SOLVED (Y,Q,B,M,S OR N} ? y
Q (CFS) ? .8 RESULTS
_ -
M (FT/FT) ? 2.5 Y= 0.26 FT
S (FT/FT) ? .11 A= 0.17 SF
N (FT"'1/6) ? .025 P= 1.39 FT
V= 4.79 FPS
F= 2.35
S - CHANNEL SLOPE
N - CHANNEL ROUGHNESS
SUPER-CRITICAL FLOW
<Shift> <Prt Sc> print <Return> repeat <Space Bar> back to menu

/.2 o s ~ N ~vc~c.. ~/~ ~~~ Zq S-1'~ ~~ * d, s t~ 3a ~- a--a /~-
lUOn.,~'N ~ ~ a i ~~ran
MAN-MADE CHANNELS
VARIABLES LIST:
Y - FLOW DEPTH B - CHANNEL BOTTOM WIDTH
Q - FLOWRATE M - CHANNEL SIDE SLOPE
VARIABLE TO BE SOLVED (Y,Q,B,M,S OR N) ? Y
Q (CFS) ? .8
B (FT} ? 0
N (FT"1/6) ? .025
RESULTS
Y= 0.26 FT
A= 0.17 SF
P= 1.42 FT
V= 4.62 FPS
F= 2 , 24
S - CHANNEL SLOPE
N - CHANNEL ROUGHNESS
SUPER-CRTTICAL FLOW
<Shift> <Prt Sc> print <Return> repeat <Space Bar> back to menu
C~/J~~2,a r~~ 3afi3o ~~ 32.4-0 /~--
--___ __
___ _ _ __
--
~~/-~ ~J~ S r ~A~ MAN-MADE CHANNELS
VARIABLES LSST:
Y ~ FLOW DEPTH B - CHANNEL BOTTOM WIDTH
Q - FLOWRATE M - CHANNEL SIDE SLOPE
VARIABLE TO BE SOLVED (Y,Q,B,M,S OR N) ? Y
Q (CFS) ? .8
B (FT) ? 0
N (FT~1/6} '? .025
RESULTS
Y= 0.26 FT
A= 0.17 SF
P= 1.39 FT
V= 4...79 FPS
F= 2.35
S - CHANNEL SLQPE
N - CHANNEL ROUGHNESS
SUPER-CRITICAL FLOW
<Shift> <Prt Sc> print <Return> repeat <Space Bar> back to menu

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CADENZA LANE PHASE 2 CONSUL"PING ENGINEERS
6 I WAKE COL/N,Y, NORTH CAROL~IA CARY, N.C• [phone]