SW6210906_Supplement-EZ Form_20211014

SUPPLEMENT-EZ COVER PAGE
FORMSLOADED
PROJECT INFORMATION
Project Name
Brooke Valley Subdivision
1
2Project Area (ac)50.2
3Coastal Wetland Area (ac)
4Surface Water Area (ac)
5Is this project High or Low Density?Low
Does this project use an off-site SCM?No
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COMPLIANCE WITH 02H .1003(4)
7Width of vegetated setbacks provided (feet)30'
8Will the vegetated setback remain vegetated?Yes
9If BUA is proposed in the setback, does it meet NCAC 02H.1003(4)(c-d)?
Is streambank stabilization proposed on this project?No
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NUMBER AND TYPE OF SCMs:
11Infiltration System
12Bioretention Cell
13Wet Pond
14Stormwater Wetland
15Permeable Pavement
16Sand Filter
17Rainwater Harvesting (RWH)
18Green Roof
19Level Spreader-Filter Strip (LS-FS)
20Disconnected Impervious Surface (DIS)
21Treatment Swale
22Dry Pond
23StormFilter
24Silva Cell
25Bayfilter
Filterra
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FORMSLOADED
DESIGNER CERTIFICATION
27Name and Title:Scott Brown, PE - Vice President
28Organization:4D Site Solutions, Inc
29Street address:409 Chicago Drive, Suite 112
30City, State, Zip:Fayetteville, NC 28306
31Phone number(s):910-426-6777
Email:[e-mail]
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Certification Statement:
I certify, under penalty of law that this Supplement-EZ form and all supporting information were prepared under my direction or supervision; that
the information provided in the form is, to the best of my knowledge and belief, true, accurate, and complete; and that the engineering plans,
specifications, operation and maintenance agreements and other supporting information are consistent with the information provided here.
Designer
______________________________________________
Signature of Designer
______________________________________________
Date
Seal

DRAINAGE AREAS
1Is this a high density project?No
ge areas/SCMs0
2 If so, number of draina
3Does this project have low density areas?Yes
4 If so, number of low density drainage areas1
Is all/part of this project subject to previous rule
5versions?No
FORMSLOADED
Entire SiteLD 1
DRAINAGE AREA INFORMATION
4Type of SCM
ge area (sq ft)21865702186570
5Total draina
6Onsite drainage area (sq ft)21865702186570
7Offsite drainage area (sq ft)00
ject(sq ft)162433 sf162433 sf
8Total BUA in pro
New BUA on subdivided lots (subject to
9permitting)(sq ft)108000 sf108000 sf
New BUA not on subdivided lots (subject to
10permitting)(sf)54433 sf54433 sf
11Offsite BUA (sq ft)
12Breakdown of new BUA not on subdivided lots:
- Parking(sq ft)
- Sidewalk (sq ft)
- Roof (sq ft)
- Roadway(sq ft)
- Future (sq ft)
- Other, please specify in the comment box
below(sq ft)
New infiltrating permeable pavement on
13subdivided lots (sq ft)
New infiltrating permeable pavement not on
14subdivided lots (sq ft)
Existing BUA that will remain (not subject to
15permitting)(sq ft)
16Existing BUA that is already permitted (sq ft)
17Existing BUA that will be removed (sq ft)
18Percent BUA7%7%
19Design storm (inches)1.0 in1.0 in
20Design volume of SCM (cu ft)
Calculation method for design volume
21
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22drainage area(s):

LOW DENSITY
59{LDbw9v…Lw9a9b{Chw\[h‘59b{L—twhW9/{CwhaЉЋI͵ЊЉЉЌ
Yes
1Is project below density thresholds set forth in the applicable stormwater rule?
Yes
2
Does project maximize dispersed flow and minimize channelization of flow?
Yes
3Has the use of piping been minimized per .1003(2)(c)?
3 sf
4
Side slopes of the vegetated conveyances (H:V)
7.69
5Maximum velocity in the vegetated conveyances during the 10-year storm?
Yes
6
Are curb outlet swales proposed?
9%
7Maximum longitudinal slope of curb outlet swale(s) (%)
2 ft
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Bottom width of curb outlet swale(s) (feet)
3:1
9Maximum side slope of curb outlet swale(s) (H:V)
105 ft
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Minimum length of curb outlet swale(s) (feet)
No
11Are treatment swales used instead of curb outlet swales?
Yes
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Is stormwater released at the edge of the setback as dispersed flow?
Yes
13Have stormwater outlets been designed to prevent downslope erosion?
No
Are variations to rule .1003 proposed?
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ADDITIONAL INFORMATION
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Please use this space to provide any additional information about this low density project:
DrainagePervious
VV
SwaleBUAQSlope
Flow depth
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AreaareaC
#(ac)(cfs)(%)
ΛŅƦƭΜΛŅƦƭΜ(ft)
(ac)(ac)
2.420.561.860.457.934.303.255.000.63
1
1.340.311.030.454.371.701.155.000.85
2
1.340.311.030.454.378.203.605.000.39
3
4.240.510.320.704.245.502.565.000.48
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1.730.800.930.607.568.607.695.000.33
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