SW6230703_Supplement-EZ Form_20231030

SUPPLEMENT-EZ COVER PAGE
IFORMS LOADED I
PROJECT INFORMATION
1 iProject Name Baywood Preserve Subdivision
2 !Project Area(ac) _ 22.3
3 tCoastal Wetland Area(ac)
4 !Surface Water Area(ac) 0.09
5 I Is this project High or Low Density? Low
6 Does this project use an off-site SCM? No
COMPLIANCE WITH 02H.1003(4)
7 I W idth 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)? N/A -.
10 Is streambank stabilization proposed on this project? No _.,
NUMBER AND TYPE OF SCMs ..., .w4 a x.,� �. r» �w �w b ,N., ,,
11 Infiltration System
12 Bioretention Cell
113 Wet Pond
114 -Stormwater Wetland
15 Permeable Pavement
16 ',Sand Filter
t 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 1Silva Cell
25 Bayfilter..-
26 Filterra
( FORMS LOADED I
DESIGNER CERTIFICATION
27 Name and Title: Scott Brown,PE-Vice President
28 ;Organization: 4D Site Solutions, Inc
•
29 iStreet address: 409 Chicago Drive Suite 112
30 ;City,State,Zip: Fayetteville, NC 28306
31 Phone number(s): 910 426 6777
32 ';Email: sbrown©4dsitesolutions.com
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
K , ,
���Sslp�9�'y
Q Signature of Designer
SEAL
027452
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s ( -33'13
COTT-r 8
Sea?'i i 1,````` Date

DRAINAGE AREAS
1 ils this a high density project? No
2 If so, number of drainage areas/SCMs 0
3 l Does this project have low densty.areas? Yes
4 If so„number of low density drainage areas 1
I Is all/part of this project subject to previous rule 1
_5versions?. __ = No._---_._-_._
FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site LD 1
4 'Type of SCM
5 Total drainage area(sq ft) 1 971 388 971 388
6 ,Onsite drainage area(sq ft) 971,388 971,388
7 1Offsite drainage area(sq ft)
8 i Total BUA in project(sq ft) o-' 233129 sf i 233129 sf
'New BUA on subdivided lots(subject to I
9 -permitting (sg ft) 199980 sf 199980 sf
I New BUA not on subdivided lots(subject to .
10 I permittmgi_(sfa 1 33149 sf .._. 33149 sf
11 Offsite BUA(sq_ft)
i
12 1 Breakdown of new BUA not on subdivided lots:
Parking_(sq ft) _
i .-Sidewalk(sq.ft)
Roof Isq ft). .. _.
Roadway(sq ft) I 33149 sf i 33149 sf
Future(sq ft)
-Other, please specify in the comment box
6 below.sg-ft)
New infiltrating permeable pavement on
13 jsubdivided lots(sgft)
New infiltrating permeable pavement not on
14 !subdivided lots(NA_ .-.
Existing BUA that will remain(not subject to
15 .permitting}(sq ft)
16 Existing_BUA that is already permitted(sq ft)
- -1 Existing_BUA that will be removed(sq_ft)
18 I Percent BUA 24% 24%
' 19 tDesgn,storm(inches)
20 Design volume of SCM(cu ft)
21 Calculation method for desi n volume
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
122 ,drainage area(s):

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? 2.95
6 Are curb outlet swales proposed? No
7 Maximum longitudinal slope of curb outlet swale(s)(%)
8 Bottom width of curb outlet swale(s)(feet)
9 Maximum side slope of curb outlet swale(s)(H:V)
10 Minimum length of curb outlet swale(s)(feet)
11 Are treatment swales used instead of curb outlet swales?
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:
The swale information is shown on the attached sheet.
Drainage Pervious
Swale BUA Q Slope Vallow V,,to,i Flow depth
Area area
(ac) (cfs) (%) (fps) (fps) (ft)
(ac) (ac)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

LOW DENSITY
Pervious SLOPE
Swale# DA(ac) BUA(ac) Area (ac) C Q(cfs) (%) Vallow Vactual F Depth (ft)
1 0.20 0.06 0.14 0.50 0.79 50.00% 5.00 1.02 0.44
2 0.10 0.03 0.07 0.50 0.40 1.80% 5.00 1.55 0.22
3 0.07 0.02 0.05 0.50 0.28 2.00% 5.00 1.44 0.19
4 0.34 0.08 0.26 0.45 1.21 1.20% 5.00 2.06 0.37
5 0.73 0.17 0.56 0.45 2.61 1.10% 5.00 2.50 0.51
6 1.49 0.23 1.26 0.40 3.78 0.70% 5.00 2.53 0.63
7 1.21 0.19 1.02 0.40 3.84 1.60% 5.00 2.95 0.58
8 0.99 0.23 0.76 0.45 3.54 1.00% 5.00 2.48 0.61
9 1.26 0.29 0.97 0.45 4.50 1.00% 5.00 2.64 0.67
10 0.25 0.06 0.19 0.45 0.89 0.80% 5.00 1.58 0.36
11 0.33 0.08 0.25 0.45 1.18 1.30% 5.00 2.20 0.35
12 3.97 0.61 3.36 0.40 10.08 1.00% 5.00 1.93 1.24
13 3.56 0.55 3.01 0.40 9.04 0.90% 5.00 2.43 1.03
14 0.50 0.12 0.38 0.45 1.79 0.50% 5.00 1.25 0.61