SWA000114_Supplement-EZ Form_20240919

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name Crescent Hill Subdivision
2 Project Area(ac) 25.45
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 0.11
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 W dth 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?
NUMBER AND TYPE OF SCMs:
11 'Infiltration System 0
12 Bioretention Cell 0
13 Wet Pond 0
14 Stormwater Wetland I 0
15 Permeable Pavement 0
16 Sand Filter 0
17 Rainwater Harvesting(RWH) 0
18 Green Roof 0
19 Level Spreader-Filter Strip(LS-FS) 0
20 Disconnected Impervious Surface(DIS) 0
21 Treatment Swale 0
22 Dry Pond 0
23 StormFilter 0
24 Silva Cell 0
25 Bayfilter 0
• 26 Filterra 0
FORMS LOADED
(DESIGNER CERTIFICATION
27 iName and Title: Steve Causey,President
28 Organization. Allied Design,INC.
29 Street address: i 4720 Kester Mill Road _
30 ,City_State,Zip: Winston-Salem,NC 27103
31 1Phone number(s) 336-765-2377
32 Email: scausey©allied-engsurv.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
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DRAINAGE AREAS
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 low density
5 Total drainage area(sq ft) 1,103,810
6 Onsite drainage area(sq ft) 1,103,810
7 Offsite drainage area(sq ft) 0
8 Total BUA in project(sq ft) 244162 sf
New BUA on subdivided lots(subject to
9 permitting)(sq ft) 181000 sf
New BUA not on subdivided lots(subject to
10 permitting)(sf) 63162 sf
11 Offsite BUA(sq ft) sf
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) sf
-Sidewalk(sq ft) 11453 sf
-Roof(sq ft) sf
-Roadway(sq ft) 51709 sf
-Future(sq ft) sf
-Other,please specify in the comment box
below(sq ft) sf
New infiltrating permeable pavement on
13 subdivided lots(sq ft) sf
New infiltrating permeable pavement not on
14 subdivided lots(sq ft) sf
Existing BUA that will remain(not subject to
15 permitting)(sq ft) sf
16 Existing BUA that is already permitted(sq ft) sf
17 Existing BUA that will be removed(sq ft) sf
18 Percent BUA 22%
19 Design storm(inches) 1.0 in
20 Design volume of SCM(cu ft) na
21 Calculation method for design volume na
ADDITIONAL INFORMATION U
Please use this space to provide any additional information about the
22 drainage area(s):
BUA%is 22.02%

LOW DENSITY
DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H.1003 411
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 sf
5 Maximum velocity in the vegetated conveyances during the 10-year storm?
6 Are curb outlet swales proposed? Yes
7 Maximum longitudinal slope of curb outlet swale(s)(%) 10%
8 Bottom width of curb outlet swale(s)(feet) 2 ft
9 Maximum side slope of curb outlet swale(s)(H:V) 3:1
10 Minimum length of curb outlet swale(s)(feet) 100 ft
11 Are treatment swales used instead of curb outlet swales? Yes
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 INFORMATIO '
15 Please use this space to provide any additional information about this low density project:
Please note that all vegetated conveyances have been designed to accommodate the 25-yr design storm.
Also note that swales 4,9,and 10 accommodate drainage from other swale sections(i.e. Swale 4 receives
drainage routed through swale 3,swale 9 recieves drainage routed through swale 8,and swale 10 receives
drainage routed through swale 8 and swale 9).
Drainage Pervious
Swale BUA Q Slope Vapow V,n„a1 Flow depth
# Area area
(ac) (cfs) (%) (fps) (fps) (ft)
(ac) (ac)
1 0.96 0.26 0.70 0.60 4.39 0.90 1.32 1.32 0.45
2 1.70 1.43 0.27 0.60 7.77 7.00 4.32 4.32 0.23
3 1.84 0.55 1.29 0.60 8.41 8.50 6.63 6.63 0.34
4 2.06 0.62 1.44 0.60 9.42 7.50 6.33 6.33 0.38
5 0.61 0.41 0.20 0.60 2.79 3.00 2.33 2.33 0.30
6 0.74 0.45 0.28 0.60 3.38 3.00 2.52 2.52 0.33
7 1.07 0.71 0.36 0.60 4.89 3.00 2.94 2.94 0.40
8 3.25 0.41 2.84 0.60 14.86 7.50 7.81 7.81 0.48
9 3.32 0.41 2.91 0.60 15.18 10.00 7.76 7.76 0.45
10 4.45 0.81 3.64 0.60 20.35 2.00 4.10 4.10 0.88
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