20061151 Ver 1_More Info Received_20090227

ENGINEERS
PLANNERS
ECONOMISTS

ASS 0 C I ATE S

WilburSmith

February 27, 2009

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FEB 2 7 2009

Division of Water Quality
401/Wetlands Unit
1650 Mail Service Center
Suite 120
Raleigh, NC 27699-1650

RE: Response to Request for More Information; DWQ Project # 06-1151

OENR. WATER Ql!ALITY
WETl.ANOS AND STORMWATER BRANCH

To whom it may concern:

This is a response to the request for more information regarding the Apex Peakway road project
in the Town of Apex, DWQ Project # 06-1151. Endosed are five (5) copies of the following:

· Completed BMP supplement form, Operation and Maintenance Agreement for
Filter Strip, Riparian Buffer and Level Spreader
· Plan set with sheets 2C, 4, 5, 6 and 7 (Preliminary)
· Stormwater Calculations (Signed and sealed February 26, 2009)

A copy of the original letter request for more information from the DWQ dated January 29,
2009 is also endosed.

Please do not hesitate to call me directly at [phone] if you have any questions or need
additional information.

Sincerely,

Wilbur Smith Associates

-r;;: ~

Tom Harris, PE
Project Manager

CC: Russell Dalton, PE - Town of Apex
Project Rle

Enclosures

421 Fayetteville Street, Suite 1303 Raleigh, NC 27601
919.755.0583 f919.832.8798 www.WilburSmith.com

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Beverly Eaves Perdue, Governor

Dee Freeman, Secretary
North Carolina Department of Environment and Natural Resources

Coleen H. Sullins, Director
Division of Water Quality

January 29,2009

Subject Property:

Town of Apex: Apex Peakway
Vt to Williams Creek [030402, 27-43-2, WSIII, NSW]

CERTIFIED MAIL: RETURN RECEIPT REQUESTED

Mr. Russell Dalton
Town of Apex
P.O. Box 250
Apex, NC 27502

REQUEST FOR MORE INFORMATION

Dear Mr. Dalton:

On January 6, 2009, the Division of Water Quality (DWQ) received your application dated December 22,
2008, to fill or otherwise impact 0.51 acres of 404/wetland, 135 linear feet of stream (PCN application
does not identify whether stream is intennittent or perennial), 0.08 acres of isolated wetland, 25,665
square feet of Zone 1 Neuse River basin protected riparian buffers and 16,623 square feet of Zone 2
Neuse River basin protected riparian buffers to construct the proposed linear roadway project at the site.
The DWQ has determined that your application was incomplete and/or provided inaccurate information
as discussed below. The DWQ will require additional information in order to process your application to
impact protected wetlands and/or streams on the subject property. Therefore, unless we receive five
copies ofthe additional information requested below, we will place this project on hold as incomplete
until we receive this additional information. Ifwe do not receive the requested information, your project
will be formally returned as incomplete. Please provide the following information so that we may
continue to review your project.

Additional Information Requested:

1. Per the requirements of GC3704, this project is subject to Stormwater Management Plan (SMP)
Requirementsfor Applicants Other Than the North Carolina Department of Transportation (see
http://h2o.enr.state.nc.us/ncwetlandsl). For each proposed BMP, please provide a completed
BMP Supplement Form with all required items (see http://h20.enr.state.nc.us/su/bmpforms.htm).

Please submit this information within 30 calendar days of the date of this letter. Ifwe do not receive this
requested information within 30 calendar days of the date of this letter, your project will be withdrawn
and you will need to reapply with a new application and a new fee.

This letter only addresses the application review and does not authorize any impacts to wetlands, waters
or protected buffers. Please be aware that any impacts requested within your application are not
authorized (at this time) by the DWQ. Please call Ms. Cyndi Karoly or Mr. Ian McMillan at 919-733-
1786 if you have any questions regarding or would like to set up a meeting to discuss this matter.

NJ,"1mCarolina
/Vaturn//II

401 OversightlExpress Review Pennitting Unit
1650 Mail Service Center, Raleigh, North Carolina 27699-1650
2321 Crabtree Boulevard, Suite 250, Raleigh, North Carolina 27604
Phone: [phone]/ FAX [phone]/Internet: !:!lm:!!h2o.cnr.statc.nc.usincwctlalld~

An Equal Opportunity! Affinnative Action Employer - 50% Recycledll 0% Post Consumer Paper

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Town of Apex
Page 2 of2
January 29, 2009

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11\ tyndi Karoly, Supervisor
tJ'-401 Oversight/Express Review Permitting Unit

CBKJijm

cc: Lauren Witherspoon, DWQ Raleigh Regional Office
USACE Raleigh Regulatory Field Office
File Copy
Matt Matthews, DWQ Wetlands and Stormwater Branch Manager
SunTemple Helgren, Wilbur Smith & Associates, 412 Fayetteville Street, Suite 1303, Raleigh, NC 27601

Filename: 061151 Ver2TOApexApexParkway{Wake)On _Hold

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DENR - WATERC~lIALlTY
\'.'ETLA.i~DS AND STOR~~WATER gR.'.~H

STORMWATER CALCULATIONS

TOWN OF APEX

APEX PEAKWAY

WSA NO.1 01673

February 26, 2009

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Apex Peakway
Storm Drainage Report

Project Description

Wilbur Smith Associates was selected to provide engineering services for a portion of the Apex
Peakway. This project involves the layout and design for a future multi-lane divided roadway
with curb and gutter and concrete median. The project consists of two railroad crossings, one at
grade and one with a bridge. This portion of the Peakway connects the existing Peakway from
North Salem Street to Old Raleigh Road. Figure 1 contains a project location map.

Purpose

The purpose of this report is to document the design of drainage, erosion and sediment control for
the proposed Apex Peakway.

Existing Condition

The project area consists of both wooded and open fields. The existing slopes in the area are
relatively mild. This existing drainage pattern has been maintained in a closed system.

Proposed Condition

,

Drainage characteristics for the proposed condition are not changed greatly from the existing
conditions and existing patterns were maintained as closely as possible. The proposed roadway
improvement includes a multi-lane highway with concrete islands and curb and gutter. Roadway
runoff is typically discharged at the same locations as in the existing conditions. Storm drain
pipes calculations are based on the lO-year design storm and inlets are spaced to contain the
spread within one half of the adjacent travel lane for the NCDOT 4 in/hr standard. Culverts are
designed based on the 25-year design storm. All calculations are preformed in accordance with
the NCDOT hydraulic design standards.

Portions of the project are adjacent to newly proposed development and coordination with the
developer has allowed for sections of the Peakway runoff to be discharged into stormwater
treatment facilities designed and constructed by the developer. Where discharging into the
adjacent stormwater ponds was not available level spreaders with forebays are used where
dissipated sheet flow is required into buffer areas. A major variance will be required to allow the
level spreaders to be constructed per NCDWQ requirements for level spreaders in series due to
the slope of the filter strip. The two level spreaders that required this major variance are located
at Outlets 22 and 27.

The accompanying calculations and methodology used in design are attached.

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STORMWATER CALCULATIONS

STORM DRAIN DESIGN COMPUTATIONS

February 2009

Description:
WSA Project No.

Apex Peakway

County: Wake

Designed by: THB
Checked by: MAD

Gum. Time Of Rainfall Total Design Design
Inlet No.1 From To Area Sum Gonc. Intensity Runoff Invert Invert Pipe Pipe Full - Pipe Actual Travel
Description Structure Structure Area 'A' "GA" 'Tc" '110' "010' Inlet Elev butlet Elev Slope Size Gapacity Velocity Time
Number Number (acres) (min) (inlhr) (cfs) (%) (in) (cfs) (fps) (min)
.
11GB 1 2 0.24 0.24 0.20 5.00 7.22 1.44 491.54 491.03 0.85 15 5.95 3.99 0.25
3 3 2 1.11 1.11 0.56 5.00 7.22 4.01 490.83 490.00 1.63 24 28.85 6.44 0.13
21GB 2 4 0.24 1.59 0.95 5.25 7.16 6.82 486.19 484.86 1.18 24 24.53 6.68 0.28
41GB 4 5 0 1.59 0.95 5.53 7.08 6.75 484.86 484.71 0.20 24 10.11 3.45 0.36
51GB 5 6 0.16 1.75 1.09 5.90 6.99 7.59 484.51 484.26 0.20 24 10.11 3.53 0.59
7 7 6 6.54 6.54 5.56 6.70 6.79 37.77 482.40 482.30 0.36 36 39.85 6.41 0.07
61GB 6 8 0.19 8.48 6.80 6.49 6.85 46.57 481.80 477.23 1.76 36 88.40 12.66 0.34
81GB 8 9 0.38 0.38 7.12 6.83 6.76 48.15 477.03 475.53 1.00 36 66.67 10.27 0.24
91GB 9 10 0.72 1.10 7.72 7.07 6.71 51.76 475.43 475.05 0.76 36 58.13 9.29 0.09
101GB 10 10A 0 1.10 7.72 7.16 6.69 51.60 474.95 473.70 0.66 36 54.08 8.71 0.36
10A/MH 10A 10B 0 1.10 7.72 7.52 6.60 50.96 473.60 472.60 2.38 36 102.88 14.93 0.05
151GB 15 16 0.66 0.66 0.54 5.00 7.22 3.91 481.70 478.86 9.47 15 19.87 14.18 0.04
17 17 18 1.23 1.23 1.14 0.00 7.22 8.20 476.95 476.25 1.00 24 22.61 6.62 0.18
191GB 19 18 0.61 0.61 0.46 5.00 7.22 3.35 479.88 479.50 4.75 15 14.07 9.40 0.01
181GB 18 20 0.16 2.00 1.73 5.01 7.22 12.45 476.05 475.75 0.97 24 22.25 7.29 0.07
20/MH 20 20A 0 2.00 1.73 5.09 7.20 12.46 475.55 474.55 0.96 24 22.18 7.27 0.24
20G FUT. 20G 20A 0.13 0.13 1.85 5.32 7.14 13.19 478.50 475.10 2.30 24 34.28 10.19 0.24
20A/M H 20A 20B 0 2.13 1.85 5.57 7.07 13.11 472.10 471.10 0.76 24 19.68 6.70 0.33
221GB 21 22 0.34 0.34 0.25 5.00 7.22 1.81 476.60 474.48 2.90 15 11.00 8.28 0.15
251GB 25 26 0.61 0.61 0.48 5.00 7.22 3.44 465.40 464.75 8.12 15 18.41 11.52 0.01
261GB 26 27 0.34 0.95 0.74 5.01 7.22 5.37 464.55 459.70 8.98 15 19.35 13.20 0.07
291GB 28 29 0.1 0.10 0.09 5.00 7.22 0.65 475.92 475.80 0.75 15 5.59 3.04 0.09

Page 1 of 1

HYDRAULIC GRADE LINE

February 2009
Description:

Apex Peakway

County: Wake

Designed by: THB

Checked by: MAD

Total Design outlet ws Friction Gontrac. Expan. Bend Total Inletws Grate elev. Diff.
Inlet No.! Runoff Pipe Pipe elevation Loss Loss Loss Loss Loss Elevation Elevation to grate
Description "010" Size Length 0.8'Do or inlet HI Hc He Hb Ht
(cIs) (in) (ft) ws elev(areater)
11GB 1.44 15 60 492.33 0.03 0.09 0.00 0,00 0.12 492.45 494.54 2.10
21GB 6.82 24 113 487.02 0.10 0.24 0.46 0.00 0.80 487.82 494.23 6.41
41GB 6,75 24 75 486.59 0.07 0.04 0.33 0.00 0.44 487,02 494.34 7.32
51GB 7.59 24 125 486.35 0.14 0.04 0.06 0.00 0.24 486.59 493.69 7.11
61GB 46.57 36 260 483.74 1.27 0.61 0.17 0.35 2.39 486.13 491.63 5.50
81GB 48.15 36 150 480.06 0.78 0.35 0.85 1.70 3.68 483.74 488.16 4.42
91GB 51.76 36 50 479.02 0.30 0.26 0.48 0.00 1.05 480.06 487.74 7.68
101GB 51.60 36 190 476.55 1.14 0.23 0.37 0.73 2.47 479.02 490.84 11.83
10NMH 50.96 36 42 475.00 0.25 0.82 0.48 0.00 1.55 476.55 489.60 13.05
0.00 0 0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
151GB 3.91 15 30 479.86 0.11 1.02 0.00 0.00 1.13 480.99 486.70 5.72
17 8.20 24 70 481.62 0.09 0.20 0.00 0.00 0.29 481.91 491,75 9.84
191GB 3.35 15 8 480.81 0.02 0.51 0.28 0.00 0.81 481.62 482.88 1.26
181GB 12.45 24 31 479.80 0.09 0.19 0.71 0.00 1.00 480.81 482,88 2.08
20/MH 12.46 24 104 478.48 0.32 0.19 0.27 0.55 1.33 479.80 482.88 3.08
20NMH 13.11 24 132 472.70 0.44 0.15 0.27 0.00 0.87 473.57 487,00 13.43
221GB 1.81 15 73 475.48 0.06 0.31 0.00 0.00 0.37 475.85 481.13 5.28
251GB 3.44 15 8 465.75 0.02 0.87 0.00 0.00 0.90 466.65 475.36 8.72
261GB 5.37 15 54 460.70 0.37 0.97 1.22 2.45 5.01 465.71 475.36 9.66

Page 1 of 1

CULVERT CALCULATIONS

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SH _OF_
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CH.

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SPREAD CALCULATIONS

Worksheet for Area A

Solve For

Efficiency

Discharge 0.80 ft3ts
Slope 0.00300 ftIft
Gutter Width 2.00 ft
Gutter Cross Slope 0.040 ftIft
Road Cross Slope 0.040 ftIft
Roughness Coefficient 0.013
Local Depression 2.00 in
Local Depression Width 3.00 ft
Grate Width 2.00 ft
Grate Length 3.00 ft
Grate Type P-50 mm (P-1-7t8")
Clogging 0.00 %
Curb Opening Length 3.00 ft

Calculation Option Use Both
Grate Flow Option Exclude None
ResUlts
Efficiency 89.46 %
Intercepted Flow 0.72 ft3ts
Bypass Flow 0.08 ft3ts
Spread 4.98 ft
Depth 0.20 ft
Flow Area 0.50 ft,
Gutter Depression 0.00 ft
Total Depression 0.17 ft
Velocity 1.61 ftIs
Splash Over Velocity 9.97 ftIs
Frontal Flow Factor 1.00
Side Flow Factor 0.59
Grate Flow Ratio 0.75
Equivalent Cross Slope 0.08141 ftIft
Active Grate Length 3.00 ft
Length Factor 0.00
Total Interception Length 5.83 ft

2/2/2009 8:31 :24 AM

Bentley Systems, Inc, Haestad Methods Solution Center Bentley FlowMaster [08.11.00.03]
27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of

Worksheet for Area B

Project; Destription

Solve For

Efficiency

Discharge 0.46 ft3/s
Slope 0.00395 flIft
Gutter Width 2.00 ft
Gutter Cross Slope 0.040 flIft
Road Cross Slope 0.040 flIft
Roughness Coefficient 0.013
Local Depression 2.00 in
Local Depression Width 3.00 ft
Grate Width 2.00 ft
Grate Length 3.00 ft
Grate Type P-50 mm (P-1-7/8")
Clogging 0.00 %
Curb Opening Length 3.00 ft
Options
Calculation Option Use Both
Grate Flow Option Exclude None
Results
Efficiency 94.37 %
Intercepted Flow 0.43 ft3/s
Bypass Flow 0.03 ft3/s
Spread 3.85 ft
Depth 0.15 ft
Flow Area 0.30 ft2
Gutter Depression 0.00 ft
Total Depression 0.17 ft
Velocity 1.55 flIs
Splash Over Velocity 9.97 flIs
Frontal Flow Factor 1.00
Side Flow Factor 0.60
Grate Flow Ratio 0.86
Equivalent Cross Slope 0.08771 flIft
Active Grate Length 3.00 ft
Length Factor 0.00
Total Interception Length 4.80 ft

2/2120098:31:27 AM

Bentley Systems, Inc. Haestad Methods Solution Center Bentley FlowMaster [08.11.00.03]
27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of

Pfoj~ct Descrrpijpn

Worksheet for Area C1/lnlet 5

Solve For

Efficiency

Discharge 0.51 ft3/S
Slope 0.00800 ftlft
Gutter Width 2.00 ft
Gutter Cross Slope 0.015 ftlft
Road Cross Slope 0.015 ftlft
Roughness Coefficient 0.013
Local Depression 2.00 in
Local Depression Width 3.00 ft
Grate Width 2.00 ft
Grate Length 3.00 ft
Grate Type P-50 mm (P-1-7/8")
Clogging 0.00 %
Curb Opening Length 3.00 ft

Calculation Option Use Both
Grate Flow Option Exclude None
Results
Efficiency 75.50 %
Intercepted Flow 0.39 ft3/S
Bypass Flow 0.12 ft3/s
Spread 6.47 ft
Depth 0.10 ft
Flow Area 0.31 ft2
Gutter Depression 0.00 ft
Total Depression 0.17 ft
Velocity 1.63 ftls
Splash Over Velocity 9.97 ftls
Frontal Flow Factor 1.00
Side Flow Factor 0.34
Grate Flow Ratio 0.63
Equivalent Cross Slope 0.04985 ftlft
Active Grate Length 3.00 ft
Length Factor 0.00
Total Interception Length 8.70 ft

2/2/2009 8:31 :33 AM

Bentley Systems, Inc. Haestad Methods Solution Center Bentley FlowMaster [08.11,00.03]
27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of

Worksheet for Area C2/lnlet 6

Solve For

Efficiency

Discharge 0.73 ft3ts
Slope 0.01800 ftlft
Gutter Width 2.00 ft
Gutter Cross Slope 0.029 ftlft
Road Cross Slope 0.029 ftlft
Roughness Coefficient 0.013
Local Depression 2.00 in
Local Depression Width 3.00 ft
Grate Width 2.00 ft
Grate Length 3.00 ft
Grate Type P-50 mm (P-1-7t8")
Clogging 0.00 %
Curb Opening Length 3.00 ft

Calculation Option
Grate Flow Option

Use Both
Exclude None

Efficiency 86.92 %
Intercepted Flow 0.63 ft3ts
Bypass Flow 0.10 ft3ts
Spread 4.21 ft
Depth 0.12 ft
Flow Area 0.26 ft2
Gutter Depression 0.00 ft
Total Depression 0.17 ft
Velocity 2.84 ftls
Splash Over Velocity 9.97 ftls
Frontal Flow Factor 1.00
Side Flow Factor 0.27
Grate Flow Ratio 0.82
Equivalent Cross Slope 0.07461 ftlft
Active Grate Length 3.00 ft
Length Factor 0.00
Total Interception Length 10.12 ft

2/2/20098:31:39 AM

Bentley Systems, Inc. Haestad Methods Solution Center Bentley FlowMaster [08.11.00,03]
27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of

Worksheet for Area C311nlet 8

Solve For

Spread

Discharge 1.32 fts/s
Gutter Width 2.00 ft
Gutter Cross Slope 0.020 ftlft
Road Cross Slope 0.020 ftlft
Local Depression 2.00 in
Local Depression Width 3.00 ft
Grate Width 2.00 ft
Grate Length 3.00 ft
Grate Type P-50 mm (P-1-7/8")
Clogging 50.00 %
Curb Opening Length 3.00 ft
Opening Height 5.00 ft
Curb Throat Type Horizontal
Throat Incline Angle 90.00 degrees

Calculation Option

Use Both

Re~ults . .

Spread
Depth
Gutter Depression
Total Depression
Open Grate Area
Active Grate Weir Length

4.88 ft
0.10 ft
0.00 ft
0.17 ft
2.70 ft,
5.00 ft

2/2/20098:31:42 AM

Bentley Systems, Inc. Haestad Methods Solution Center Bentley FlowMaster [08.11.00.03]
27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of

Worksheet for Area D

Solve For

Spread

Discharge 1.66 ft3/s
Gutter Width 2.00 ft
Gutter Cross Slope 0.020 ftIft
Road Cross Slope 0.020 ftIft
Local Depression 2.00 in
Local Depression Width 3.00 ft
Grate Width 2.00 ft
Grate Length 3.00 ft
Grate Type P-50 mm (P-1-7/8")
Clogging 50.00 %
Curb Opening Length 3.00 ft
Opening Height 5.00 ft
Curb Throat Type Horizontal
Throat Incline Angle 90.00 degrees

Calculation Option

Use Both

Spread 5.90 ft
Depth 0.12 ft
Gutter Depression 0.00 ft
Total Depression 0.17 ft
Open Grate Area 2.70 ft'
Active Grate Weir Length 5.00 ft

2/2/20098:31:17 AM

Bentley Systems, Inc. Haestad Methods Solution Center Bentley FlowMaster [08.11.00.03]
27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of 1

Worksheet for Area F

Solve For

Efficiency

Discharge 2.39 ft3/s
Slope 0.05000 ftlft
Gutter Width 2.00 ft
Gutter Cross Slope 0.040 ftlfl
Road Cross Slope 0.040 ftlfl
Roughness Coefficient 0.013
Local Depression 2.00 in
Local Depression Width 3.00 ft
Grate Width 2.00 ft
Grate Length 3.00 ft
Grate Type P-50 mm (P-1-7/8")
Clogging 0.00 %
Curb Opening Length 3.00 fl

Calculation Option
Grate Flow Option

Use Both
Exclude None

Efficiency 82.12 %
Intercepted Flow 1.96 ft3/s
Bypass Flow 0.43 ft3/s
Spread 4.43 ft
Depth 0.18 ft
Flow Area 0.39 ft2
Gutter Depression 0.00 ft
Total Depression 0.17 ft
Velocity 6.08 ftls
Splash Over Velocity 9.97 ftls
Frontal Flow Factor 1.00
Side Flow Factor 0.11
Grate Flow Ratio 0.80
Equivalent Cross Slope 0.08434 ftlfl
Active Grate Length 3.00 ft
Length Factor 0.00
Total Interception Length 21.03 ft

~

2/2/2009 8:31:54 AM

Bentley Systems, Inc. Haestad Methods Solution Center Bentley FlowMaster [08,11.00,03]
27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of

Worksheet for Area G

Solve For

Spread

Discharge
Gutter Width
Gutter Cross Slope
Road Cross Slope
Local Depression
Local Depression Width
Grate Width
Grate Length
Grate Type
Clogging
Curb Opening Length
Opening Height
Curb Throat Type
Throat Incline Angle

1.49 ft3/S
2.00 ft
0.020 ftIft
0.020 ftIft
2.00 in
3.00 ft
2.00 ft
3.00 ft
P-50 mm (P-1-7/8")
50.00 %
3.00 ft
5.00 ft
Horizontal
90.00 degrees

Options.

Calculation Option

Use Both

Results

Spread
Depth
Gutter Depression
Total Depression
Open Grate Area
Active Grate Weir Length

5.41 ft
0.11 ft
0.00 ft
0.17 ft
2.70 ft2
5.00 ft

2/2/20098:31:57 AM

Bentley Systems, Inc. Haestad Methods Solution Center Bentley FlowMaster [08.11.00.03]
27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of

Worksheet for Area H

Solve For

Efficiency

Discharge 1.97 ft'/s
Slope 0.02365 ftlft
Gutter Width 2.00 ft
Gutter Cross Slope 0.040 ftlft
Road Cross Slope 0.040 ftlft
Roughness Coefficient 0.013
Local Depression 2.00 in
Local Depression Width 3.00 ft
Grate Width 2.00 ft
Grate Length 3.00 ft
Grate Type P-50 mm (P-1-7/8")
Clogging 0.00 %
Curb Opening Length 3.00 ft

Calculation Option
Grate Flow Option

Use Both
Exclude None

Efficiency 81.18 %
Intercepted Flow 1.60 ft'/s
Bypass Flow 0.37 ft'/s
Spread 4.74 ft
Depth 0.19 ft
Flow Area 0.45 ft2
Gutter Depression 0.00 ft
Total Depression 0.17 ft
Velocity 4.38 ftls
Splash Over Velocity 9.97 ftls
Frontal Flow Factor 1.00
Side Flow Factor 0.19
Grate Flow Ratio 0.77
Equivalent Cross Slope 0.08265 ftlft
Active Grate Length 3.00 ft
Length Factor 0.00
Total Interception Length 15.68 ft

2/2/2009 8:32:01 AM

Bentley Systems, Inc. Haestad Methods Solution Center Bentley FlowMaster [08.11.00.03]
27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of

Worksheet for Area I

Solve For

Efficiency

Discharge 2.16 ft3/S
Slope 0.01430 fIIft
Gutter Width 2.00 ft
Gutter Cross Slope 0.040 fIIft
Road Cross Slope 0.040 fIIft
Roughness Coefficient 0.013
Local Depression 2.00 in
Local Depression Width 3.00 ft
Grate Width 2.00 ft
Grate Length 3.00 ft
Grate Type P-50 mm (P-1-7/8")
Clogging 0.00 %
Curb Opening Length 3.00 ft

Calculation Option
Grate Flow Option

Use Both
Exclude None

Efficiency 77.88 %
Intercepted Flow 1.68 ft3/S
Bypass Flow 0.48 ft3/S
Spread 5.40 ft
Depth 0.22 ft
Flow Area 0.58 ft2
Gutter Depression 0.00 ft
Total Depression 0.17 ft
Velocity 3.71 fils
Splash Over Velocity 9.97 fils
Frontal Flow Factor 1.00
Side Flow Factor 0.24
Grate Flow Ratio 0.71
Equivalent Cross Slope 0.07939 fIIft
Active Grate Length 3.00 ft
Length Factor 0.00
Total Interception Length 14.35 ft

2/2/20098:32:05 AM

Bentley Systems, Inc. Haestad Methods Solution Center Bentley FlowMaster [08.11.00.03]
27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of

Worksheet for Area J

Solve For

Efficiency

Discharge 2.14 ft3ts
Slope 0.05000 ftlft
Gutter Width 2.00 ft
Gutter Cross Slope 0.040 ftlft
Road Cross Slope 0.040 ftlft
Roughness Coefficient 0.013
Local Depression 2.00 in
Local Depression Width 3.00 ft
Grate Width 2.00 ft
Grate Length 3.00 ft
Grate Type P-50 mm (P-1-7t8")
Clogging 0.00 %
Curb Opening Length 3.00 ft

Calculation Option
Grate Flow Option

Use Both
Exclude None

Efficiency 83.83 %
Intercepted Flow 1.79 ft3ts
Bypass Flow 0.35 ft3ts
Spread 4.25 ft
Depth 0.17 ft
Flow Area 0.36 ft2
Gutter Depression 0.00 ft
Total Depression 0.17 ft
Velocity 5.91 ftls
Splash Over Velocity 9.97 ftls
Frontal Flow Factor 1.00
Side Flow Factor 0.12
Grate Flow Ratio 0.82
Equivalent Cross Slope 0.08535 ftlft
Active Grate Length 3.00 ft
Length Factor 0.00
Total Interception Length 19.93 ft

2/2/2009 8:32:08 AM

Bentley Systems, Inc. Haestad Methods Solution Center Bentley FlowMaster [08.11,00.03]
27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of

Worksheet for Area K

Solve For

Efficiency

Discharge 1.14 ft3ts
Slope 0.05000 ftlft
Gutter Width 2.00 ft
Gutter Cross Slope 0.050 ftlft
Road Cross Slope 0.010 ftlft
Roughness Coefficient 0.013
Local Depression 2.00 in
Local Depression Width 3.00 ft
Grate Width 2.00 ft
Grate Length 3.00 ft
Grate Type P-50 mm (P-1-7t8")
Clogging 0.00 %
Curb Opening Length 3.00 ft

Calculation Option Use Both
Grate Flow Option Exclude None
ReSults
Efficiency 96.29 %
Intercepted Flow 1.10 ft3ts
Bypass Flow 0.04 ft3ts
Spread 5.95 ft
Depth 0.14 ft
Flow Area 0.26 ft2
Gutter Depression 0.08 ft
Total Depression 0.25 ft
Velocity 4.43 ftls
Splash Over Velocity 9.97 ftls
Frontal Flow Factor 1.00
Side Flow Factor 0.05
Grate Flow Ratio 0.96
Equivalent Cross Slope 0.07973 ftlft
Active Grate Length 3.00 ft
Length Factor 0.00
Total Interception Length 15.94 ft

2/2/20098:32:11 AM

Bentley Systems, Inc. Haestad Methods Solution Center Bentley FlowMaster [08.11.00.03]
27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of

Worksheet for Area L

Solve For

Spread

Discharge 0.51 ft'/s
Gutter Width 2.00 ft
Gutter Cross Slope 0.003 ftlft
Road Cross Slope 0.003 ftlft
Local Depression 2.00 in
Local Depression Width 3.00 ft
Grate Width 2.00 ft
Grate Length 3.00 ft
Grate Type P-50 mm (P-1-7/8")
Clogging 50.00 %
Curb Opening Length 3.00 ft
Opening Height 5.00 ft
Curb Throat Type Horizontal
Throat Incline Angle 90.00 degrees

Calculation Option

Use Both

Spread 7.50 ft
Depth 0.02 ft
Gutter Depression 0.00 ft
Total Depression 0.17 ft
Open Grate Area 2.70 ft2
Active Grate Weir Length 5.00 ft

2/2/20098:32:14 AM

Bentley Systems, Inc. Haestad Methods Solution Center Bentley FlowMaster [08.11,00.03]
27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of

Worksheet for Area M

Solve For

Spread

Discharge 1.76 ft3/s
Gutter Width 2.00 ft
Gutter Cross Slope 0.055 ftlft
Road Cross Slope 0.015 ftlft
Local Depression 2.00 in
Local Depression Width 3.00 ft
Grate Width 2.00 ft
Grate Length 3.00 ft
Grate Type P-50 mm (P-1-7/8")
Clogging 50.00 %
Curb Opening Length 3.00 ft
Opening Height 5.00 ft
Curb Throat Type Horizontal
Throat Incline Angle 90.00 degrees

Calculation Option

Use Both

F{esults/ ;

Spread
Depth
Gutter Depression
Total Depression
Open Grate Area
Active Grate Weir Length

7.12 ft
0.19 ft
0.08 ft
0.25 ft
2.70 ft2
5.00 ft

2/2120098:32:16 AM

Bentley Systems, Inc. Haestad Methods Solution Center Bentley FlowMaster [08.11.00.03]
27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of

Worksheet for Area N

Solve For

Spread

Discharge 1.07 ft3/S
Gutter Width 2.00 ft
Gutter Cross Slope 0.055 ftlft
Road Cross Slope 0.015 ftlft
Local Depression 2.00 in
Local Depression Width 3.00 ft
Grate Width 2.00 ft
Grate Length 3.00 ft
Grate Type P-50 mm (P-1-7/8")
Clogging 50.00 %
Curb Opening Length 3.00 ft
Opening Height 5.00 ft
Curb Throat Type Horizontal
Throat Incline Angle 90.00 degrees

Calculation Option

Use Both

Resuits

Spread
Depth
Gutter Depression
Total Depression
Open Grate Area
Active Grate Weir Length

2.76 ft
0.14 ft
0.08 ft
0.25 ft
2.70 ft2
5.00 ft

2/2/2009 8:32:20 AM

Bentley Systems, Inc. Haestad Methods Solution Center Bentley FlowMaster [08.11.00.03]
27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of

Worksheet for Area P

Solve For

Efficiency

Discharge 1.00 ft3/S
Slope 0.03000 ftlft
Gutter Width 2.00 ft
Gutter Cross Slope 0.015 ftlft
Road Cross Slope 0.015 ftlft
Roughness Coefficient 0.013
Local Depression 2.00 in
Local Depression Width 3.00 ft
Grate Width 2.00 ft
Grate Length 3.00 ft
Grate Type P-50 mm (P-1-7/8")
Clogging 0.00 %
Curb Opening Length 3.00 ft

Calculation Option
Grate Flow Option

Use Both
Exclude None

Efficiency 67.63 %
Intercepted Flow 0.68 ft3/S
Bypass Flow 0.32 ft3/S
Spread 6.50 ft
Depth 0.10 ft
Flow Area 0.32 ft2
Gutter Depression 0.00 ft
Total Depression 0.17 ft
Velocity 3.16 ftls
Splash Over Velocity 9.97 ftls
Frontal Flow Factor 1.00
Side Flow Factor 0.14
Grate Flow Ratio 0.63
Equivalent Cross Slope 0.04973 ftlft
Active Grate Length 3.00 ft
Length Factor 0.00
Total Interception Length 17.18 ft

2/2/2009 8:32:27 AM

Bentley Systems, Inc. Haestad Methods Solution Center Bentley FlowMaster [08.11.00.03]
27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of

Worksheet for Area Q

Solve For

Efficiency

Discharge 0.67 fls/s
Slope 0.03000 ftlfl
Gutter Width 2.00 fl
Gutter Cross Slope 0.055 ftlfl
Road Cross Slope 0.015 ftlfl
Roughness Coefficient 0.013
Local Depression 2.00 in
Local Depression Width 3.00 fl
Grate Width 2.00 fl
Grate Length 3.00 fl
Grate Type P-50 mm (P-1-7/8")
Clogging 0.00 %
Curb Opening Length 3.00 fl

Calculation Option
Grate Flow Option

Use Both
Exclude None

Efficiency 99.83 %
Intercepted Flow 0.67 fls/s
Bypass Flow 0.00 fl3/s
Spread 3.69 fl
Depth 0.14 fl
Flow Area 0.18 fl2
Gutter Depression 0.08 fl
Total Depression 0.25 fl
Velocity 3.68 ftls
Splash Over Velocity 9.97 ftls
Frontal Flow Factor 1.00
Side Flow Factor 0.11
Grate Flow Ratio 1.00
Equivalent Cross Slope 0.09387 ftlfl
Active Grate Length 3.00 fl
Length Factor 0.00
Total Interception Length 9.92 fl

2/2/20098:32:30 AM

Bentley Systems, Inc. Haestad Methods Solution Center Bentley FlowMaster [08.11,00.03]
27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of

PfojeGt

Worksheet for Area R

Solve For

Spread

Discharge
Gutter Width
Gutter Cross Slope
Road Cross Slope
Local Depression
Local Depression Width
Grate Width
Grate Length
Grate Type
Clogging
Curb Opening Length
Opening Height
Curb Throat Type
Throat Incline Angle

1.39 ft3/s
2.00 ft
0.060 ftIft
0.020 ftIft
2.00 in
3.00 ft
2.00 ft
3.00 ft
P-50 mm (P-1-7/8")
50.00 %
3.00 ft
5.00 ft
Horizontal
90.00 degrees

Options ..

Calculation Option

Use Both

Results

Spread
Depth
Gutter Depression
Total Depression
Open Grate Area
Active Grate Weir Length

2.89 ft
0.17 ft
0.08 ft
0.25 ft
2.70 ft2
5.00 ft

2/2/20098:32:33 AM

Bentley Systems, Inc. Haestad Methods Solution Center Bentley FlowMaster [08.11.00.03]
27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of 1

Worksheet for Area S

Solve For

Spread

Discharge 0.97 ft3/s
Gutter Width 2.00 ft
Gutter Cross Slope 0.060 ftlft
Road Cross Slope 0.020 ftlft
Local Depression 2.00 in
Local Depression Width 3.00 ft
Grate Width 2.00 ft
Grate Length 3.00 ft
Grate Type P-50 mm (P-1-7/8")
Clogging 50.00 %
Curb Opening Length 3.00 ft
Opening Height 5.00 ft
Curb Throat Type Horizontal
Throat Incline Angle 90.00 degrees

Calculation Option

Use Both

Results'

Spread
Depth
Gutter Depression
Total Depression
Open Grate Area
Active Grate Weir Length

2.62 ft
0.14 ft
0.08 ft
0.25 ft
2.70 ft2
5.00 ft

2/2/20098:32:36 AM

Bentley Systems, Inc. Haestad Methods Solution Center Bentley FlowMaster [08,11,00.03]
27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of

Worksheet for Area T

Solve For

Spread

Discharge 1.90 ft3/S
Gutter Width 2.00 ft
Gutter Cross Slope 0.060 ftIft
Road Cross Slope 0.020 ftIft
Local Depression 2.00 in
Local Depression Width 3.00 ft
Grate Width 2.00 ft
Grate Length 3.00 ft
Grate Type P-50 mm (P-1-7/8")
Clogging 50.00 %
Curb Opening Length 3.00 ft
Opening Height 5.00 ft
Curb Throat Type Horizontal
Throat Incline Angle 90.00 degrees

Calculation Option

Use Both

Spread 6.02 ft
Depth 0.20 ft
Gutter Depression 0.08 ft
Total Depression 0.25 ft
Open Grate Area 2.70 ft2
Active Grate Weir Length 5.00 ft

2/2/20098:34:11 AM

Bentley Systems, Inc. Haestad Methods Solution Center Bentley FlowMaster [08.11.00.03]
27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of

Worksheet for Area U

Solve For

Spread

Discharge
Gutter Width
Gutter Cross Slope
Road Cross Slope
Local Depression
Local Depression Width
Grate Width
Grate Length
Grate Type
Clogging
Curb Opening Length
Opening Height
Curb Throat Type
Throat Incline Angle

Options

Calculation Option

Results

Spread
Depth
Gutter Depression
Total Depression
Open Grate Area
Active Grate Weir Length

2.82 ft3ts
2.00 ft
0.060 ftIft
0.020 ftIft
2.00 in
3.00 ft
2.00 ft
3.00 ft
P-50 mm (P-1-7t8")
50.00 %
3.00 ft
5.00 ft
Horizontal
90.00 deg rees

Use Both

8.66 ft
0.25 ft
0.08 ft
0.25 ft
2.70 ft'
5.00 ft

2/212009 8:32:46 AM

Bentley Systems, Inc, Haestad Methods Solution Center Bentley FlowMaster [08.11.00.03]
27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of 1

Worksheet for Area V

Solve For

Efficiency

Discharge 0.36 ft3/s
Slope 0.02662 ftIft
Gutter Width 2.00 ft
Gutter Cross Slope 0.060 ftIft
Road Cross Slope 0.020 ftIft
Roughness Coefficient 0.013
Local Depression 2.00 in
Local Depression Width 3.00 ft
Grate Width 2.00 ft
Grate Length 3.00 ft
Grate Type P-50 mm (P-1-7/8")
Clogging 0.00 %
Curb Opening Length 3.00 ft

Calculation Option
Grate Flow Option

Use Both
Exclude None

Efficiency 100.00 %
Intercepted Flow 0.36 ft3/s
Bypass Flow 0.00 ft3/s
Spread 1.91 ft
Depth 0.11 ft
Flow Area 0.11 ft2
Gutter Depression 0.08 ft
Total Depression 0.25 ft
Velocity 3.29 ftIs
Splash Over Velocity 9.97 ftIs
Frontal Flow Factor 1.00
Side Flow Factor 0.16
Grate Flow Ratio 1.00
Equivalent Cross Slope 0.10222 ftIft
Active Grate Length 3.00 ft
Length Factor 0.00
Total Interception Length 7.00 ft

2/212009 8:32:51 AM

Bentley Systems, Inc. Haestad Methods Solution Center Bentley FlowMaster [08.11.00.03]
27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA [phone] Page 1 of

LEVEL SPREADER
CALCULATIONS

Please indicate the page or plan sheet numbers where the supporting documentation can be found, An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below, If a
requirement has not been met, attach justification.

Initials
-7///.1

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1///]
7fl?
il/IJ
, p

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r:10

Pagel Plan
Sheet No.
S; 1." 7
I ,

zc...

zc.

~A
t+

v
t/
.;viA

/

1. Plans (1" - 50' or larger) of the entire site showing:
- Design at ultimate build-out,
- Off-site drainage (if applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Forebay (if applicable),
- High flow bypass system,
- Maintenance access,
- Proposed drainage easement and public right of way (ROW), and
- Boundaries of drainage easement.

2, Plan details (1" = 30' or larger) for the level spreader showing: D' hn \ .$ h ~ i.N^ V\ 0 ~ r \J
- Forebay (if applicable), t r ( 7. '1 (
_ High flow bypass system, 5' { d e l1J , {A' e' ,
- One foot topo, lines between the level lip and top of stream bank, C () f{J t~(,J {4/ > c. ,.'cf h fe b t\. S,
- Proposed drainage easement, and -? 1// J
- Design at ultimate build-out. II

3. Section view of the level spreader (1" = 20' or larger) showing:
- Underdrain system (if applicable),
- Level lip,
- Upslope channel, and
- Downslope filter fabric,

4, A date-stamped photograph of the filter strip that clearly shows the type of vegetation that is present.
~;k cilv'leI"H.1 clet-iYed; vvdl he.. ci~.ued ctlAvi,^:;) (ov\)I1lvtG \1\,1.
5. A construction sequence that shows how the level spreader will be protected from sediment until the entire ,_
drainage area is stabilized. 1 . . . .'_ L , _'\. ~ f ,) ( /- . ( f--v ' h' (,"'- c; CU ,I' S e tt i "'" tV"
Le.v'e.1 5Pft!t;rJ.k.v L (}_^~YVVl{. ~'tt ' .> c..^ -> !.olc;
6. The supporting calculations, ht:st",> Cd'~ ,re~.v't)ved,

7, A copy of the signed and notarized operation and maintenance (O&M) agreement.

8. A copy of the deed restrictions (if required),

Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5

Part III, page 9 of 9

AVA
NCDENR

OW~~VlATt;-90c..
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STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely filled out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)!

Project name
. Contact name
Phone number
Date
Drainage area number

Apex Peakway
Todd H. Buckner, PE
[phone]
February 4, 2009
Outlet 16, Drainage Area I

For Level Spreaders Receiving Flow From a BMP
Type of BMP
Drawdown flow from the BMP

For Level Spreaders Receiving Flow from the Drainage Area
Drainage area
Impervious surface area
Percent impervious
Rational C coefficient
Peak flow from the 1 in/hr storm
Time of concentration
Rainfall intensity, 10-yr storm
Peak flow from the 1 O-yr storm

Where Does the Level Spreader Discharge?
To a grassed bioretention cell?
To a mulched bioretention cell?
To a wetland?
To a filter strip or riparian buffer?
Other (specify)

Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass
Width of dense ground cover
Width of wooded vegetation
Total width
Elevation at downslope base of level lip
Elevation at top of bank of the receiving water
Slope (from level lip to to top of bank)
Are any draws present?

Level Spreader Design
Forebay surface area
Feet of level lip needed per cfs
Answer "Y" to one of the following:
Length based on the 1 in/hr storm?
Length based on the 1 O-yr storm?
Length based on the BMP discharge rate?
Design flow
Is a bypass device provided?

Form SW401-Level Spreader, Filter Strip. Restored Riparian Buffer-Rev.S

cfs

28,750.00
24,829.00
86.36
0.82
0.54
5.04

If
If

%

cfs

min
7.22 in/hr
cfs

3.91

(YarN)
(Y orN)
(YorN)
(Y or N) Please complete filter strip characterization below.

Y

50.00 It
It
It
50.00 It
466.00 fmsl
464.34 fmsl
3.32 % OK
N (YorN) OK
50.00 sq It OK
13 Wcfs
(YorN)
Y (YorN)
(YarN)
3.91 cis
N (Y or N) A bypass device is not needed.

Parts I. and II. Design Summary, page 1 of 9

Length of the level lip
Are level spreaders in series?

Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
Y
Peak velocity in the channel during the 1 O-yr storm
_ Channel lining material

.
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,
,
,

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,
.

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52.00
Y

It
(YorN)

(YarN)
(YorN)

It
It
It
It
cfs

w

I,

B

Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5

Level spreader length OK.
This will require a variance if the filter strip is a protected riparian buffer.

Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.

Parts I. and II. Design Summary, page 2 of 9

OW~~VlATt;-90c..
iJ Y
~ ~
o "'"

STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely filled out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)!

Project name
Contact name
Phone number
Date
Drainage area number

Apex Peakway
Todd H. Buckner, PE
[phone]
February 4, 2009
Outlet 22, Drainage Area P

For Level Spreaders Receiving Flow From a BMP
Type of BMP
Drawdown flow from the BMP

For Level Spreaders Receiving Flow from the Drainage Area
Drainage area
Impervious surface area
Percent impervious
Rational C coefficient
Peak flow from the 1 in/hr storm
Time of concentration
Rainfall intensity, 10-yr storm
Peak flow from the 1 O-yr storm

Where Does the Level Spreader Discharge?
To a grassed bioretention cell?
To a mulched bioretention cell?
To a wetland?
To a filter strip or riparian buffer?
Other (specify)

Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass
Width of dense ground cover
Width of wooded vegetation
Total width
Elevation at downslope base of level lip
Elevation at top of bank of the receiving water
Slope (from level lip to to top of bank)
Are any draws present?

Level Spreader Design
Forebay surface area
Feet of level lip needed per cfs
Answer "yo to one of the following:
Length based on the 1 in/hr storm?
Length based on the 1 Q-yr storm?
Length based on the BMP discharge rate?
Design flow
Is a bypass device provided?

Fonm SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5

cfs

14,810.00
12,197.00
82.36
0.74
0.25
5.15

If
If

%

cfs

1.82

min
7.22 in/hr
cfs

(YarN)
(YorN)
(Y or N)
(Y or N) Please complete filter strip characterization below.

Y

50.00 It
It
It
50.00 It
463.50 fmsl
456.32 fmsl
14.36 % Level spreaders must be placed in series.
N (YorN) OK
25.00 sq It OK
13 ftlcfs
(YorN)
Y (Y orN)
(YorN)
1.82 cfs
N (YarN) A bypass device is not needed.

Parts I. and II. Design Summary, page 3 of 9

Length of the level lip
Are level spreaders in series?

Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
'M .'
B
W
Y
Peak velocity in the channel during the 1 O-yr storm
. Channel lining material

.
:4
,
,
,

~

:.
,
,
.

w

Fonm SW401-Level Spreader, Filter Strip, Restored Riparian Butler-Rev.5

26.00 .. It
. Y,- \] '. .. ~(Y or N)
:.. ,,1_...... ,_.'

(Y or N)
(Y or N)

It
It
It
It
cfs

Level spreader I).~~. I
This will reqU~'~~e'i~.the filter strip is a protected riparian buffer.

NCDE r ':;

Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the wor1<sheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.

.
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B

Parts I. and 11. Design Summary, page 4 of 9

AVA
NCDENR

OW~~VlATt;-90c..
iJ Y
~ ~
o "'"

STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely filled out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)!

.

. Project name
Contact name
Phone number
Date
Drainage area number

Apex Peakway
Todd H. Buckner, PE
[phone]
February 4, 2009
Outlet 27, Drainage Area R&T

For Level Spreaders Receiving Flow From a BMP
Type of BMP
Drawdown flow from the BMP

For Level Spreaders Receiving Flow from the Drainage Area
Drainage area
Impervious surface area
Percent impervious
Rational C coefficient
Peak flow from the 1 in/hr storm
Time of concentration
Rainfall intensity, 10-yr storm
Peak flow from the 1 O-yr storm

Where Does the Level Spreader Discharge?
To a grassed bioretention cell?
To a mulched bioretention cell?
To a wetland?
To a filter strip or riparian buffer?
Other (specify)

Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass
Width of dense ground cover
Width of wooded vegetation
Total width
Elevation at downslope base of level lip
Elevation at top of bank of the receiving water
Slope (from level lip to to top of bank)
Are any draws present?

Level Spreader Design
Forebay surface area
Feet of level lip needed per cfs
Answer "Y" to one of the following:
Length based on the 1 inlhr storm?
Length based on the 1 O-yr storm?
Length based on the BMP discharge rate?
Design flow
Is a bypass device provided?

Fonm SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5

cfs

41 ,382.00
33,541.00
81.05
0.78
0.74
5.44

If
If

%

cfs

5.35

min
7.22 in/hr
cfs

(YorN)
(YorN)
(Y orN)
(Y or N) Please complete filter strip characterization below.

Y

50.00 It
It
It
50.00 It
457.00 fmsl
456.37 fmsl
1.26 % OK
N (YorN) OK
70.00 sq It OK
13 ftlcfs
(YorN)
Y (YorN)
(YarN)
5.35 cfs
N (Y orN) A bypass device is not needed.

Parts I. and II. Design Summary, page 5 of 9

Length of the level lip
Are level spreaders in series?

Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
Y
Peak velocity in the channel during the 1 O-yr storm
. Channel lining material

.
:.
,
,
,

~

:.
,
,
.

w

Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5

70.00
Y

It
(Y orN)

(YarN)
(Y orN)

It
It
It
It
cfs

Level spreader length OK.
This will require a variance if the filter strip is a protected riparian buffer.

Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.

.
I'
,
,
,
,

I,

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! M
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,
,
,
.

B

Parts I. and II. Design Summary, page 6 of 9

AVA
NCDENR

O~W~VlATt;-90c..
iJ Y
~ ~
o "'"

STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT
This form must be completely filled out, printed and submitted.
DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKLIST AND ALL REQUIRED ITEMS (NEXT WORKSHEET)!

. Project name
Contact name
Phone number
Date
Drainage area number

Apex Peakway
Todd H. Buckner, PE
[phone]
February 4, 2009
Outlet 29, Drainage Area V

For Level Spreaders Receiving Flow From a BMP
Type of BMP
Drawdown flow from the BMP

For Level Spreaders Receiving Flow from the Drainage Area
Drainage area
Impervious surface area
Percent impervious
Rational C coefficient
Peak flow from the 1 in/hr storm
Time of concentration
Rainfall intensity, 10-yr storm
Peak flow from the 10-yr storm

Where Does the Level Spreader Discharge?
To a grassed bioretention cell?
To a mulched bioretention cell?
To a wetland?
To a filter strip or riparian buffer?
Other (specify)

Filter Strip or Riparian Buffer Characterization (if applicable)
Width of grass
Width of dense ground cover
Width of wooded vegetation
Total width
Elevation at downslope base of level lip
Elevation at top of bank of the receiving water
Slope (from level lip to to top of bank)
Are any draws present?

Level Spreader Design
Forebay surface area
Feet of level lip needed per cfs
Answer "Y" to one of the following:
Length based on the 1 in/hr storm?
Length based on the 10-yr storm?
Length based on the BMP discharge rate?
Design flow
Is a bypass device provided?

Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5

cfs

4,356.00
4,356.00
100.00
0.90
0.09
5.09

If
If

%

0.65

cfs
min
7.22 in/hr
cfs

(YorN)
(YorN)
(YorN)
(Y or N) Please complete filter strip characterization below.

Y

50.00 It
It
It
50.00 It
467.00 fmsl
463.67 fmsl
6.66 %
N (YorN) OK
10.00 sq It OK
13 ftlcfs
(YorN)
Y (YorN)
(YorN)
0.65 cfs
N (Y or N) A bypass device is not needed.

Parts I. and II. Design Summary, page 7 of 9

Length of the level lip
Are level spreaders in series?

Bypass Channel Design (if applicable)
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Dimensions of the channel (see diagram below):
M
B
W
Y
- Peak velocity in the channel during the 1 O-yr storm
. Channel lining material

.
~ ~
,
,

~

:4
,
,
.

,

.
.

w

Form SW401-Level Spreader, Filter Strip, Restored Riparian Buffer-Rev.5

13.00
N

It Level spreader length OK.
(Y orN)

It
It
It
It
cfs

(Y orN)
(Y orN)

Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.
Do not complete this section of the worksheet.

I,

.
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,
,
,

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,
,
.

B

Parts I. and II. Design Summary, page B of 9