SW6230806_Supplement-EZ Form_20240516

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name Brookwood Subdivision Phase 4
2 Project Area(ac) 52.39
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 0.98
5 Is this project High or Low Density? Low
6 Does this project use an off-site SCM? No
COMPLIANCE WITH 02H.1003(4)
7 Width of vegetated setbacks provided(feet) 30
8 Will the vegetated setback remain vegetated? Yes
9 If BUA is proposed in the setback,does it meet NCAC 02H.1003(4)(c-d)? Yes
10 Is streambank stabilization proposed on this project? No
NUMBER AND TYPE OF SCMs:
11 Infiltration System
12 Bioretention Cell
13 Wet Pond
14 Stormwater Wetland
15 Permeable Pavement
16 Sand Filter
17 Rainwater Harvesting(RWH)
18 Green Roof
19 Level Spreader-Filter Strip(LS-FS)
20 Disconnected Impervious Surface(DIS)
21 Treatment Swale
22 Dry Pond
23 StormFilter
24 Silva Cell
25 Bayfilter
26 Filterra
FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title: Jackson D.Maples,Project Manager
28 Organization: LKC Engineering,PLLC
29 Street address: 140 Aqua Shed Ct.
30 City,State,Zip: Aberdeen NC,28315
31 Phone number(s): 910-420-1437
32 Email: [e-mail]
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
•,,•,,,,,,,,,,,,,,,diriorro. 4,
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SEI� � Signatur of Designe
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Seal V
15-P Date

DRAINAGE AREAS
Is this a high density project?
1No
2 If so,number of drainage areas/SCMs _ 0
3 Does this project have low density areas? _ Yes
4 If so,number of low density drainage areas _ 1
Is all/part of this project subject to previous rule
5 versions? No
FORMS LOADED
DRAINAGE AREA INFORMATION i Entire Site LD 1
4 Type of SCM
5 Total drainage area(sq ft) 2,282,108 2,282,108
6 Onsite drainage area(sq ft) 2,282,108 2,282,108
7 Offsite drainage area(sq ft) N/A N/A
8 Total BUA in project(sq ft) N/A N/A
New BUA on subdivided lots(subject to
9 permitting)(sq ft) N/A N/A
New BUA not on subdivided lots(subject to
10 permitting)(sf) 81021 sf 81021 sf
11 Offsite BUA(sq ft)
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft)
-Sidewalk(sq ft)
-Roof(sq ft)
-Roadway(sq ft) 81021 sf 81021 sf
-Future(sq ft)
-Other,please specify in the comment box
below(sq ft)
New infiltrating permeable pavement on
13 subdivided lots(sq ft)
New infiltrating permeable pavement not on
14 subdivided lots(sq ft)
Existing BUA that will remain(not subject to
15 permitting)(sq ft)
16 Existing BUA that is already permitted(sq ft)
17 Existing BUA that will be removed(sq ft)
18 Percent BUA 84% 84%
19 Design storm(inches)
20 Design volume of SCM(cu ft)
21 Calculation method for design volume
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
The site will use conveyance swales for runoff from the roadway and
dispersed flow for the individual lots.

LOW DENSITY
DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H.1003 1 Is project below density thresholds set forth in the applicable stormwater rule? Yes
2 Does project maximize dispersed flow and minimize channelization of flow? Yes
3 Has the use of piping been minimized per.1003(2)(c)? Yes
4 Side slopes of the vegetated conveyances(H:V) I .3 sf
5 Maximum velocity in the vegetated conveyances during the 10-year storm? 5.3
6 Are curb outlet swales proposed? No
7 Maximum longitudinal slope of curb outlet swale(s)(%) N/A
8 Bottom width of curb outlet swale(s)(feet) N/A
9 Maximum side slope of curb outlet swale(s)(H:V) N/A
10 Minimum length of curb outlet swale(s)(feet) N/A
11 Are treatment swales used instead of curb outlet swales? No
12 Is stormwater released at the edge of the setback as dispersed flow? Yes
13 Have stormwater outlets been designed to prevent downslope erosion? Yes
14 Are variations to rule.1003 proposed? No
ADDITIONAL INFORMATION
15 Please use this space to provide any additional information about this low density project:
S75 straw matting with Bermuda grass seed will be the permanent cover for all swales.
Drainage Pervious
Swale BUA Q Slope V,uow V,a°,i Flow depth
Area area C
# (ac) (cfs) (%) (fps) (fps) (ft)
(ac) (ac)
1 1.58 0.16 1.42 0.27 4.20 1.50 5.00 2.59 0.34
2 2.20 0.220 1.98 0.24 5.83 1.50 5.00 2.84 0.40
3 0.25 0.101 0.15 0.49 1.08 1.50 5.00 1.79 0.18
4 0.69 0.07 0.62 0.27 1.82 1.50 5.00 1.96 0.21
5 0.43 0.17 0.26 0.49 1.83 2.68 5.00 2.47 0.19
6 0.77 0.310 0.46 0.49 3.33 2.68 5.00 3.03 0.27
7 0.17 0.067 0.10 0.49 0.72 2.00 5.00 1.53 0.11
8 0.13 0.04 0.08 0.44 0.49 2.00 5.00 1.44 0.10
9 0.53 0.211 0.32 0.49 2.26 2.00 5.00 2.38 0.23
10 0.89 0.36 0.53 0.49 3.83 2.00 5.00 2.73 0.29
11 0.17 0.068 0.10 0.49 0.72 3.39 5.00 2.60 0.32
12 0.27 0.050 0.22 0.34 0.80 3.39 5.00 3.41 0.48
13 1.80 0.180 1.62 0.24 4.77 2.22 5.00 3.55 0.70
14 0.62 0.250 0.37 0.49 2.64 4.22 5.00 3.91 0.50
15 4.21 0.040 4.17 0.28 11.14 2.00 5.00 4.16 0.96
16 2.43 0.280 2.15 0.56 11.92 3.19 5.00 5.00 0.75
17 0.57 0.020 0.55 0.24 1.50 1.00 5.00 1.93 0.51
18 1.55 0.78 0.77 0.58 7.87 1.08 5.00 3.67 1.00
19 2.54 0.000 2.54 0.16 6.74 3.50 5.00 4.52 0.50
20 1.74 0.52 1.22 0.41 6.23 0.93 5.00 3.41 1.00
21 0.95 0.30 0.65 0.44 3.63 2.00 5.00 5.00 1.00
22 0.39 0.00 0.39 0.20 1.04 1.10 5.00 3.71 1.00
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