SW6240802_Supplement-EZ Form_20240905

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION ----1�
1 Project Name Broadway Crossing I
2 Project Area(ac) _ _ 368.08 - _
3 Coastal Wetland Area(ac) _ _ 0 _ —
4 Surface Water Area(ac) 7.7
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) I 30
8 Will the vegetated setback remain vegetated? I Yes
9 If BUA is proposed in the setback,does it meet NCAC 02H.1003(4)(c-d)?
10 Is streambank stabilization proposed on this project? I No
NUMBER AND TYPE OF SCMs:
11 Infiltration System 1� 0 _
12 Bioretention Cell I _ 0
13 Wet Pond 0
14 Stormwater Wetland _ 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 Name and Title: Ryan Wadsworth,P.E.
28 Organization: Timmons Group
29 Street address: 5410 Trinity Rd,Suite 102 _
30 City,State,Zip: Raleigh,NC 27607
31 Phone number(s): 919-866-4516 _—
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.
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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 jType of SCM N/A N/A
5 Total drainage area(sq ft) 22529676 22529676
6 Onsite drainage area(sq ft) L 16033500 16033500
7 Offsite drainage area(sg ft) 6496176 6496176
8 Total BUA in project(sq ft) 2546680 sf 2546680 sf _
New BUA on subdivided lots(subject to
9 permitting)(sq ft) 1080000 sf_ _ 1080000 sf
New BUA not on subdivided lots(subject to
10 permitting)(sf) 502720 sf 502720 sf
11 Offsite BUA(sq ft) 963960 sf 963960 sf
12 Breakdown of new BUA not on subdivided lots: _
Parking(sq ft) 3910 sf 3910 sf _
-Sidewalk(sq ft) N/A N/A
Roof(sq ft) f N/A N/A
-Roadway(sq ft) [_ 498810 sf 498810 sf
-Future(sq ft) _ N/A N/A
-Other,please specify in the comment box
below(sq ft) N/A _ N/A
New infiltrating permeable pavement on
13 subdivided lots(sq ft) N/A N/A
New infiltrating permeable pavement not on
14 subdivided lots(sq ft) N/A N/A
Existing BUA that will remain(not subject to
15 permitting)(sq ft) N/A N/A _
16 Existing BUA that is alreadypermitted(sq ft) N/A N/A
17 Existing BUA that will be removed(sq ft) N/A N/A
18 Percent BUA 16% 16%
19 Design storm(inches) N/A N/A
20 Design volume of SCM(cu ft) N/A N/A
21 Calculation method for design volume N/A N/A
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 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)? L. Yes
4 Side slopes of the vegetated conveyances(H:V) 3:1
5 Maximum velocity in the vegetated conveyances during the 10-year storm? 33.67
6 Are curb outlet swales proposed? No
7 Maximum Ion itudinal 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:
Stormwater runoff will be conveyed with the use of roadside swales and RCP culverts and outlet at non-erosive velocities.
Calculations for swales and culverts are provided in the Stormwater Impact Analysis.
Drainage Pervious
Swale Area BUA area C Q Slope Vaiia V.,t„-, Flow depth
(ac) (ac) (ac) (cfs) (%) I (fps) (fin) (ft)
2
3 -
4
5
6 __ I
7
8
10
12
13
14
15
16
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18
19
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27
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30