SW4210801_Supplement-EZ Form_20220105

SUPPLEMENT-EZ COVER PAGE
INFORMATION
1 Project Name
2 Project Area (ac)
3 Coastal Wetland Area (ac)
4 Surface Water Area (ac)
-5 Is this project High or Low Density?
6 'Does this project use an off -site SCM?
. Width of vegetated setbacks provided (feet)
8 Will the vegetated setback remain vegetated?
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?
11 1Infiltration 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
27 Name and Title:
28 Organization:
29 Street address:
30 City, State, Zip:
31 Phone number(s):
32 ',Email:
unlf Caren
__._._._ Q__-- ---.-.-_
Q__.-
Low
No
0
N/A
No
__... 0
0
— ----0-
_.. --- 0
_--- 0
_ _0
0
_0..
0
0
— 0
--- 0
Chad E. Abbott, PE
C3 Design and Engineering, PLLC
537 East Lyon Station Road, Suite 102
Creedmoor, NC 27522
919-230-0996
[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.
C A 0
;a SEAL
4
Signature of Designer
10/z s
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
1
5
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
LID 1
4
Type of SCM
NA
5
Total drainage area (sq ft
1023201
6
Onsite drainage area (sq ft
1023201
7
Offsite drainage area (sq ft)
0
8
Total BUA in project (sq ft)
141052 sf
9
New BUA on subdivided lots (subject to permitting)
(sq ft
108000 sf
10permitting)
New BUA not on subdivided lots (subject to
s
33052 sf
11
Offsite BUA (sq ft
sf
12
Breakdown of new BUA not on subdivided lots:
Parkin (sq ft
24000 sf
Sidewalk (sq ft
1657 sf
Roof (sq ft)
84000 sf
Roadway s ft
31395 sf
Future (sq ft)
sf
Other, please specify in the comment box
below (sq ft
sf
13
New infiltrating permeable pavement on
subdivided lots (sq ft)
sf
14
New infiltrating permeable pavement not on
Isubdivided lots (sq ft
sf
15permitting)
Existing BUA that will remain (not subject to
s ft
sf
16
Existing BUA that is already permitted (sq ft
13816 sf
17
Existing BUA that will be removed (sq ft)
13816 sf
18
Percent BUA
13%
19
Design storm (inches)
NA
20
Design volume of SCM cu ft
NA
21
1 Calculation method for design volume
NA
ADDITIONAL INFORMATION
22
Please use this space to provide any additional information about the
drainage area(s):
Property has two drainage area (DA), but summarized in one DA since the
mafority of proposed impervious area are located in one specific DA.

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 sf
5
Maximum velocity in the vegetated conveyances during the 10-year storm?
4.23
6
Are curb outlet swales proposed?
No
7
Maximum longitudinal 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?
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
lAre variations to rule .1003 proposed?
No
ADDITIONAL INFORMATION
15
Please use this space to provide any additional information about this low density project:
N/A
Swale
4
FDrainage
Area
ac
BUA
(ac)
Pervious
area
ac
C
Q
(cfs)
Slope
( % )
Va„ow
(fps)
Va ua
(fps)
Flow depth
(ft)
1
0.91
0.32
0.59
0.46
3.00
1.85
6.45
3.31
0.55
2
0.34
0.07
0.27
0.35
0.85
1.66
6.11
2.32
0.35
3
0.74
0.25
0.49
0.45
2.41
1.96
6.64
3.20
0.50
4
0.34
0.07
0.27
0.35
0.86
1.85
6.45
2.42
0.34
5
7.74
0.00
7.74
0.20
11.07
1.17
5.13
3.86
0.98
6
5.97
0.00
5.97
0.20
8.53
1.77
6.32
4.23
0.82
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30