SW4221001_Supplement-EZ Form_20221020

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 1 Project Name Fieldcrest Subdivision
2 Project Area (ac) 34.29
3 Coastal Wetland Area (ac) 0
4 Surface Water Area (ac) 0.16
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)
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
NUMBER 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
DESIGNER CERTIFICATION
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 number(s):
919-230-0996
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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Signature of Designer
09-30-2022
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 are
1
5
Is all/part of this project subject to previous rule
Iversions? I
No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
LD 1
4
Type of SCM
NA
5
Total drainage area (sq ft)
1493664
6
Onsite drainage area sq ft
1493664
7
Offsite drainage area sq ft
8
Total BUA in project (sq ft
178200 sf
9(sq
New BUA on subdivided lots (subject to permitting)
ft
142200 sf
10permitting)
New BUA not on subdivided lots (subject to
sf
Offsite BUA (sq ft)
Breakdown of new BUA not on subdivided lots:
36000 sf
11
sf
12
- Parking (sq ft
sf
- Sidewalk (sq ft
sf
- Roof (sq ft
- Roadway s ft
- Future sq ft
- Other, please specify in the comment box
below (sq ft
New infiltrating permeable pavement on subdivided
lots (sq ft
sf
sf
sf
sf
13
sf
14
New infiltrating permeable pavement not on
subdivided lots sq ft
sf
15
Existing BUA that will remain (not subject to
permitting)sq ft
sf
16
ExistingBUA that is alreadypermitted s ft
sf
17
ExistingBUA that will be removed s ft
sf
18
Percent BUA
12%
19
Design storm inches
NA
20
Desi n volume of SCM cu ft
NA
21
Calculation method for design volume
NA
DITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s): j
Property has two drainage area (DA), but summarized in one DA since the
majority 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?
2.45
6
Are curb outlet swales proposed?
No
7 1
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?
I Yes
13 1
Have stormwater outlets been designed to prevent downslope erosion?
Yes
14 1
Are 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
#
Drainage
Area
BUA
(ac)
Pervious
area
C
Q
(cfs)
Slope
N
V,ii°„,
(fps)
Va,wai
(fps)
Flow depth
(ft)
1
2
0.29
0.11
0.18
0.48
0.98
0.85
5.00
0.72
0.67
3
2.57
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
0.47
0.46
1.88
5.00
0.64
0.49
7
2.28
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