SW4221001_Supplement-EZ Form_20230302

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
ROJECT INFO ATION
1 Project Name
2 Project Area ac
3 Coastal Wetland Area
Fieldcrest Subdivision
34.13
5 Ils this project High or Low Density? Low
6 1 Does this protect use an off -site SCM? No
NCE WITH 02H .1
7
Width 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)?
No
10
Is streambank stabilization proposed on this project?
No
UMBER AND TYPE OF SCMs:
11
Infiltration System
0
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
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
ESIGNE RTIFICATION
27
Name and Title:
Chad E. Abbott, PE
28
Organization:
C3 Design and Engineering, PLLC
29
Street address:
2537 East Lyon Station Road, Suite 102
30
City, State, Zip:
Creedmoor, NC 27522
31
Phone numbers :
919-230-0996
32
1 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.
Signature of Designer
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
5
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
LD 1
LD 2
4
Type of SCM
NA
NA
NA
5
Total drainage area (sq ft
1486676
323282
1163395
6
Onsite drainage area (sq ft)
1486676
323282
1163395
7
Offsite drainage area (sq ft
8
Total BUA in project (sq ft)
178200 sf
43400 sf
134800 sf
9
New BUA on subdivided lots (subject to permitting)
(sq ft
142200 sf
32400 sf
109800 sf
10permitting)
New BUA not on subdivided lots (subject to
s
36000 sf
11000 sf
25000 sf
11
Offsite BUA (sq ft
sf
sf
sf
12
Breakdown of new BUA not on subdivided lots:
Parking (sq ft
sf
sf
sf
Sidewalk (sq ft)
sf
sf
sf
Roof (sq ft
sf
sf
sf
Roadway s ft
sf
sf
sf
Future (sq ft
sf
sf
sf
Other, please specify in the comment box
below (sq ft
sf
sf
sf
13
New infiltrating permeable pavement on
subdivided lots s ft
sf
sf
sf
14
New infiltrating permeable pavement not on
subdivided lots s ft
sf
sf
sf
15
Existing BUA that will remain (not subject to
ermitting) (sq ft
sf
sf
sf
16
Existing BUA that is already permitted (sq ft
sf
sf
sf
17
Existing BUA that will be removed (sq ft
sf
sf
sf
18
JPercent BUA
12%
13%
12%
19
IDesign storm inches
NA
NA
NA
20
1 Design volume of SCM cu ft
NA
NA
NA
21
Calculation method for design volume
NA
NA
NA
DDITIONAL INFORMATION
22
Please use this space to provide any additional information about the
drainage area(s):
LD1 drains to Motes Creek. LD2 drains to Caterpillar Creek

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?
2.45
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?
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
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
2
0.28
0.11
0.18
0.50
0.98
0.85
5.00
0.72
0.67
3
2.58
0.07
2.50
0.22
4.13
1.23
5.00
1.78
0.88
4
5
1.57
0.05
1.52
0.22
2.52
1.94
5.00
1.45
0.76
6
0.14
0.05
0.09
0.48
0.46
1.88
5.00
0.64
0.49
7
2.29
0.21
2.07
0.27
4.47
4.90
5.00
2.45
0.78
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30