SW5240301_Supplement-EZ Form_20240620

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
—
„ —
1 Project Name w s � Juniper Ridge Subdivision
2 Project Area(ac) 44
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 2.6
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)
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 0
r 12 Bioretention Cell 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
9i 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: Nicholas S.Rightmyer,PE
28 Organization: Joyner Keeny,PLLC
29 Street address: 1051 N.Winstead Avenue
30 City,State,Zip: Rocky Mount NC 27804
31 Phone number(s): 252 977-3124
( 32 Email: nrightmyer(joynerkeeny.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
0111111111////
\\`��H CAROB/''%
•
SEAL 9t'•• _ Signature of Desig
=Z ' 036243
••FGINE •19, ��\
5(..- I' `SSCOTTRG\` ? - 20Zy
///&�71110 Date

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 2
Is all/part of this project subject to previous rule
5 versions? No
FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site LD 7 LD 2
4 Type of SCM Roadway Ditches Roadway Ditches Roadway Ditches
5 Total drainage area(sq ft) 2,496,978 _ 703,926 1,793,052 _
6 Onsite drainage area(sq ft) 2,030,657 571,112 1,459,545
7 Offsite drainage area(sq ft) 466,321 132,814 333,507
8 Total BUA in project(sq ft) 397954 sf 124227 sf 273728 sf
New BUA on subdivided lots(subject to permitting)
9 (sq ft) 336000 sf 109658 sf 226343 sf
New BUA not on subdivided lots(subject to
10 permitting)(sf) 61954 sf 14569 sf 47385 sf
11 Offsite BUA(sq ft) N/A N/A N/A
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) N/A N/A N/A
-Sidewalk(sq ft) N/A N/A N/A
-Roof(sq ft) N/A N/A N/A
-Roadway(sq ft) 61954 sf 14569 sf 47385 sf
-Future(sq ft) N/A N/A N/A
-Other,please specify in the comment box
below(sq ft) N/A N/A N/A
New infiltrating permeable pavement on
13 subdivided lots(sq ft) N/A N/A N/A
New infiltrating permeable pavement not on
14 subdivided lots(sq ft) N/A N/A N/A
Existing BUA that will remain(not subject to
15 permitting)(sq ft) N/A N/A N/A
16 Existing BUA that is already permitted(sq ft) N/A N/A N/A
17 Existing BUA that will be removed(sq ft) N/A N/A N/A
18 Percent BUA 20% 22% 19%
19 Design storm(inches) 5.3 in 5.3 in 5.3 in
20 Design volume of SCM(cu ft) N/A N/A N/A
21 Calculation method for design volume Rational Rational Rational
ADDITIONAL INFORMATION _
Please use this space to provide any additional information about the
22 drainage area(s):
#9=#of lots*max permissable/lot(7000sf)
Fraction of lots in each DA=Lot area in DA/Total Lot Area
(See attached table)

LOW DENSITY
DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H.1003 410
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)? I Yes
4 Side slopes of the vegetated conveyances(H:V) I 4:1
5 Maximum velocity in the vegetated conveyances during the 10-year storm? 4.75
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) I
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? N/A
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:
#12:The vegetated setback is not within the state permit area.
Drainage Pervious
Swale Area BUA area C Q Slope V.,, V,,t„i Flow depth
# (acl (ac) (ac) (cfs) (%) (fps) (fps) (ft)
1 4.47 0.00 0.03 0.40 12.53 0.50 5.00 1.68 2.30
2 7.34 0.00 0.13 0.40 20.58 1.00 5.00 2.83 2.30
3 0.44 0.00 0.06 0.40 1.23 0.30 5.00 0.37 2.30
4 0.24 0.00 0.06 0.40 0.67 0.50 5.00 0.32 1.50
5 0.42 0.00 0.09 0.40 1.18 0.50 5.00 0.47 1.50
6 1.73 0.00 0.10 0.40 4.85 1.25 5.00 1.59 1.50
7 0.44 0.00 0.03 0.40 1.23 1.30 5.00 0.76 1.50
8 1.57 0.00 0.18 0.40 4.40 1.30 5.00 1.54 1.50
9 0.51 0.00 0.09 0.40 1.43 2.20 5.00 1.06 1.50
10 0.19 0.00 0.03 0.40 0.53 1.50 5.00 0.48 1.50
11 15.36 0.00 0.04 0.40 43.07 2.10 5.00 4.75 2.00
12 0.56 0.00 0.02 0.40 1.57 2.10 5.00 1.10 1.50
13 0.03 0.00 0.01 0.40 0.08 0.30 5.00 0.05 2.00
14 0.55 0.00 0.07 0.40 1.54 0.20 5.00 0.35 3.00
15
16
17