SW4240203_Supplement-EZ Form_20240625

DocuSign Envelope ID:8FAF228D-D814-4F90-820E-972D98FE8639
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FORMS LOADED
PROJECT INFORMATION
1 Project Name Hidden Woods Village
2 Project Area(ac) 16.391
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 0.178
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)? N/A
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: Alex Carter,PE
28 Organization: Beeson&Carter,PA
29 Street address: 4510 Reidsville Road
30 City,State,Zip: Winston Salem,NC 27101
31 Phone number(s): 336-748-0071
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
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Seal Date

DocuSign Envelope ID:8FAF228D-D814-4F90-820E-972D98FE8639
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1 Is this a high density project? No
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 Entire Site LD 1
4 Type of SCM Vegetated Vegetated
5 Total drainage area(sq ft) 713977 713977
6 Onsite drainage area(sq ft) 713977 713977
7 Offsite drainage area(sq ft)
8 Total BUA in project(sq ft) 110050 sf 110050 sf
New BUA on subdivided lots(subject to permitting)
9 (sq ft) 71400 sf 71400 sf
New BUA not on subdivided lots(subject to
10 permitting)(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)
-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) 38650 sf — 38650 sf
16 Existing BUA that is already permitted(sq ft)
17 Existing BUA that will be removed(sq ft)
18 Percent BUA 15% 15%
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):
See sheet C-4.0 for more details on drainage areas. Site has exempt paved
streets paved in 2008(See email from Jim Farkas on determination)and is
low density,using some road side ditches

DocuSign Envelope ID:8FAF228D-D814-4F90-820E-972D98FE8639
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) 3:1
5 Maximum velocity in the vegetated conveyances during the 10-year storm? 3.9
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:
This site began developmetn in 2008-2009 and went dormant during the economic downturn. There are some existing side
ditches as shsown on C-4.0 and the only existing pipe is a 48"RCP culvert installed at a drainage low point for the road
construction. Pipes are proposed for the home driveway connections crossing side ditches. No additional pipes or conveyances
beyond what was originally installed are planned to support the hoe construction phase of development.
Drainage Pervious
Swale Area BUA area C Q Slope Vallow Va«oa, Flow depth
# (ac) (ac) (ac) (cfs) (%) (fps) (fps) (ft)
1 0.23 0.05 0.18 0.35 0.55 2.00 5.00 1.64 0.31
2 0.19 0.04 0.16 0.35 0.45 2.00 5.00 1.49 0.29
3 0.26 0.00 0.26 0.35 0.62 12.00 5.00 3.35 0.23
4 0.59 0.07 0.52 0.35 1.41 12.00 5.00 3.90 0.32
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