SW4220301_Supplement-EZ Form_20220606

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name Woodhaven Subdivision
2 Project Area (ac) 16.9
3 Coastal Wetland Area ac 0
4 Surface Water Area ac 0
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
lWidth of vegetated setbacks provided (feet)
30
8
Will the vegetated setback remain vegetated?
N/A
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
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
Ba filter
0
26 ,Filterra
0
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
Ravindra Bissram, PE
Fleming Engineering, Inc.
8518 Triad Drive
28
Organization:
29
Street address:
City,State Zip:
Phone numbers : _
Email:
30
Colfax, NC 27235
31
336-544-6426
32
[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.
Desr_aner
�ey
2741
R
� *0
t'e
Signature of Designer
4-6-AL
Date

DRAINAGE AREAS
1
Is this a hi h densi _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
LD 1
4
Type of SCM
NONE
NONE
5
Total drainage area (sq ft
737950
737950
6
Onsite drainage area (sq ft
737950
737950
7
Offsite drainage area (sq ft
0
0
8
Total BUA in project (sq ft
152460 sf
152460 sf
9
New BUA on subdivided lots (subject to permitting)
(sq ft
98000 sf
98000 sf
10permitting)
New BUA not on subdivided lots (subject to
s
54460 sf
54460 sf
11
Offsite BUA (sq ft
sf
sf
12
Breakdown of new BUA not on subdivided lots:
- Parking (sq ft
1850 sf
1850 sf
- Sidewalk (sq ft
9300 sf
9300 sf
- Roof (sq ft
sf
- Roadway s ft
- Future (soft
- Other, please specify in the comment box
below (sq ft
40030 sf
40030 sf
3280 sf
3280 sf
_
13
New infiltrating permeable pavement on
subdivided lots (sq ft
sf
sf
14
New infiltrating permeable pavement not on
subdivided lots s ft
sf
sf
15
Existing BUA that will remain (not subject to
ermitting) (sq ft
sf
sf
16
1 Existing BUA that is already permitted (sq ft
sf
sf
17
Existing BUA that will be removed (sq ft
sf
sf
18
Percent BUA
20%
20%
19
Design storm inches
20
Design volume of SCM cu ft
na
na
21
Calculation method for design volume
na
na
INFORMATION
Please use this space to provide any additional information about the
Item 12 "Future" Verdant Lane is not required to be installed at this time and
is considered as future ISA.

LOW DENSITY
DESIGN RE UIREMENTS FOR LOW DENSITY PROJECTS FROM 02ii .100
1
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 to 1
5
Maximum velocity in the vegetated conveyances during the 10- ear stone?
7.9
6
IAre curb outlet swales proposed?
No
7
Maximum longitudinal slope of curb outlet swale(s) (%)
8
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?
12
Is stonmwater released at the edge of the setback as dispersed flow?
Yes
13
Have stonmwater outlets been designed to prevent downslo a erosion?
Yes
14
Are variations to rule .1003 proposed?
No
ADDITIONAL INFORMATION
15 1 Please use this space to provide any additional information about this low density project.
17.9 Acres of offsite drainage area flow to the western property line as indicated in information provided in the packet The
majority of storm drainage installed is to bypass this water through the site. Due to site topography and locations of where offsite
water enters the property, swaling/ditching was not an option due to the high erosive nature of the existing material (as what
currently exist near the entrance adjacent to lot 26). The storm bypass lines have drops through the structures to better control
velocities of the offsite runoff
Swale
#
Drainage
Area
BUA
(ac)
Pervious
area
C
Q
(cfs)
Slope
I[%)
V.o
(fps)
V,-,
(fps)
Flow depth
(h)
1
0.13
0.08 0.05
0.80
0.72
4.00
5.00
3.09
0.08
2
0.10
0.03
0.07
0.65
0.45
2.00
5,00
2,08
0.07
3
0.08
0.03
0.05
0.65
0.36
4.00
5.00
2,57
0.05
4
1.71
0.20
1.51
0.60
7.06
3.00
5.00
4.02
0.50
5
0.33
0,14
0.19
1 0.80
1.82
3.00
1 5.00
3.39
0,18
6
1.53
0.11
1.42
0.60
6,32
2.20
5,00
3.46
0.52
7
0.33
0.10
0.23
0.65
1.48
9.60
10.00
7.86
0.07
8
0.33
0.10
0.23
0.65
1.48
40.00
25.00
10.80
0.05
9
2.76
0.38
2.38
0.60
11.39
1.80
5.00
3.41
0.95
10
2.77
0.25
2.52
0.60
11.43
1.50 1
500
3.14
1.04
11
0.29
1 0.11
0.18
0.65
1.30
2.10
5.00
2.76
0.16
12
022
0,09
0.13
0.65
0.98
1.80
5.00
2,13
0.13
13
0.83
0.04
0.79
0.60
3.43
13.40
10.00
9.43
0,11
14
12.88
0.02
12.86
0.50 1
44.31
4.30
10.00
9.80
0.70
15
0.39
0.13
026
0.60
1.61
7.80
5.00
4.14
0.11
16
17
1s
19
20
21
22
23
24
25
26
27
28
29
30