SW4210803_Supplement-EZ Form_20220120

SUPPLEMENT-EZ COVER PAGE
FORMS LOAOF❑
°ROJECTINFORMATION ---- - T
~ 1
Pra ect
i
Community Road Substation
2
Project Area ac
_--
2.457 Y
3
Coastal 4Netlarsd Area
4
Surface Water Area (ac) —
--
fl__
5
B
Is this project Hior i.ow Density? —�
Does this project use an off -site SCM?
€
Low
No — —
'OMPLIANCE WITH 02H .1003(4)
7 Width of vegetated setbacks provided {feet — 30 no water features on_site�_,__ .
8 Wili the vegetated setback remain vegetated?
9 If SUA is proposed in the setback, does it meet NCAC 02H.100314} c-d ? _ NIA
10 Is streambank stabilization proposed on this project? —___-- No j
IUMBER AND TYPE OF. SCMs: f
11
Infiltration S siem._....�,..w.....,.w......w._x,.......^�.,.,a.�.,�_,a:��r.,.,.�,_,�,,...��.��:-�,�n��.�-w,r.�,..,�.�.�_.�:,Y,�,�
_12
Sioretention Ceti
13
Wet Pond
14
Stormwater Wetland
_ 15
Permeable Pavement—--—
_18
17
18
Sand Filter
Rainwater Harvesting (RWH)
Green Roof
._19
I evel Spreader-EilEer Strip (LS-F5)—
20
Disconnected Impervious Surface (DIS)
21
Treatment Swale
126Ht�e=Wrra--
I
FORMSLOAUD
ESIGNER CERTIFICATION €
27
Name and Title: _
Dan E�6rewer,�pept�ManagerJ
28
Organization:
ESP Associates, Inc.
29
Street address:
20484 Chartw_ell Center Drive, Suite D
30
City, State, Zip:
Cornelius, NC 28024_
31
32
Phone numbers :
Email_
704-990-9428 —
[e-mail]
Certification Statement
€ 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 knovAedge, 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.
�!� r.
Signature of Designer
Date

DRAINAGE AREAS
1 Is this a high ciensity_prnject? No
-_--
If so, number of drainage areaslSGMs € 0
3 _ foes this protect have low dens€ty areas? ___ Yes
4 If so, number of low density drainage areas __ - 4
5 (Is allipart of this project subject to previous rule ' 1
versions? No
FORNIS LOADED
ji]RRINAGE AREA INFORMATION Entire Site s
f
4
Type of SCM _
5
Total drainage area (sq ft 107029
6IOnsite
_
drainage areas ft 107029
7
Offsite drainage area (sq ft)
8
__
(Total BUA i_ n projects ft) 1194 sf
New BUA on subdivided lots (subject to
9
ermittin t�
I
New BUA not on subdivided lots {subject to
10
permitting) (sf) 1199 sf__
11
#Mite BUA (sq ftj
12 _Breakdown
of new BUA not on subdivided lots-
Parkin
�� . 9 (sq ft) _.__-d'�--�C
Sidewalk (sq ft)
_ (
Roof (sq ft)
Roadway (sq ft)
Future sq ft).
Other, please specify in the comment bo--x ?
I
below (sct ft 1199 sf
New infiltrating permeable pavement on
13
-
subdivided lots (scLft
New infiltrating permeable pavement not on
14
subdivided lots s ft
Existing BUA that will remain (not subject to
15
permitting) (sq ft)
1J 16 (Existing
BUA that is already permitted Lg ft j
BUA roar
20 1 Design volume of SCM (cu ft) —4
21 1 Calculation method for desian volume
rIONAL INFORMATION
Please use this space to provide any additional information about iho
22

LOW DENSITY
t)� ESiGN
REQUIREMENTS FOR _LOW _DENSITY PROJECTS FROM 02H.1003
Is project bholds sein elow density thres€ forth the applicable stormtivater rule? _; Yes
1
2
,Does project maximize dispersed flow and minimize channelization of flow? Yes
3
JHas the use of piping been minimized per .1003(2)(c)? T � I -Yes
4
(Side slopes of the vegetated conveyances {H:V} TTm 3 sf
5
(Maximum velocity in the vegetated conveyances during the 10-year storm?
6
7
JAre curb outlet swales proposed? _ No
ff Maximum longitudinal slope of curb outlet swale(s)
6
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? No _w-
12-
13_
_
Is stormwater released at the edge of the setback as dispersed flow? m - Yes-
Have been
t
) 14
stom:water outlets designed to prevent downslo a erosion? Yes
Are variations to rote .1003 proposed. _.._._._ --- N__
nstor:�00� �
A6DITiONAL
� �p.Hn w� ��s.�� ����. �•
INFORMATION x
Conveyance Swales are present on site as well as a non -required (non-SCM) detention basin. The low density project provides
detention to eliminate any concentrated flows or erosion downstream.
Swale
#
Drainage J Pervious
Area BUA area t Q
ac (ac)
slope V.,
f m (fps)
_ V , ; � Flow depth
(fps) ((tj.: -:
Jac){cfs).
I
2.67 0.03 ' 2.64 0.60 13.55
2.00 d 5.50
!! 2.84 ? 1.26
2
0.11 0.000 0.11 0 60 0.46
S( 3.63 5,50
` 1.23 i 0.35
3
0.19� ! 4) OD Y_0.19 i 0.60 i- 0.79
3.88 l 5.50
1.56 WYi uW 0.411
4
0.87 i 0.00 0.87 0.60 3.63
j 1.60 5 50
{ 1 19 € 1.01
722
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