SW4220301_Application Form_20221214

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
ECT INFORMATION
Project Name
Proiect Area (ac)
Surface Water Area (ac)
Is this project High or Low Density?
Does this proiect use an off -site SCM?
Woodhaven Subdivision
16.9
0
No
COMPLIANCE WITH 02H .1003(4)
7
Width 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
113ayfilter
0
26
IFilterra
0
FORMS LOADED
CERTIFICATION
Email:
Ravindra Bissram, PE
Fleming Engineering, Inc.
8
NC 27235
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
z v'
027436
GIN E�QQ�,
Seal
Signature of Designer
Date
December 14, 2022

DRAINAGE AREAS
1
Is this a hi h 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
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
ermitting) (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
40030 sf
40030 sf
Future (sq ft
3280 sf
3280 sf
Other, please specify in the comment box
below (sq ft
13
New infiltrating permeable pavement on
isubdivided lots (sq ft
sf
sf
14
New infiltrating permeable pavement not on
subdivided lots (sq ft
sf
sf
15permitting)
Existing BUA that will remain (not subject to
s ft
sf
sf
16
Existing BUA that is already permitted (sq ft
sf
sf
17
Existing BUA that will be removed (sq ft
sf
sf
18
Percent BUA
21 %
21 %
19
Design storm inches
20
IDesiqn volume of SCM cu ft
na
na
21
lCalculation method for design volume
na
na
ADDITIONAL INFORMATION
22
Please use this space to provide any additional information about the
drainage area(s):
Item 12 "Future" Verdant Lane is not required to be installed at this time
and is considered as future ISA.

LOW DENSITY
DESIGN
REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 021-1.1003
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 to 1
5
Maximum velocity in the vegetated conveyances during the 10-year storm?
9.32
6
Are 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 stormwater released at the edge of the setback as dispersed flow?
Yes
13
Have stormwater outlets been designed to prevent downslope erosion?
Yes
14
JAre 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. Swale
information is updated and conforms with exhibits in this package. Velocities prior/during/after stablization conform with
manufacturers specifications for Curlex I, Curex II, and Pyramat (specs previously submitted).
Swale
#
Drainage
Area
ac
BUA
(ac)
Pervious
area
ac
C
Q
(cfs)
Slope
N
V,11-
(fps)
V.�.,
(fps)
Flow depth
(ft)
1
0.13
0.08
0.05
0.80
0.72
4.00
5.00
3.32
0.06
2
0.10
0.03
0.07
0.65
0.45
2.00
5.00
2.29
0.06
3
0.08
0.03
0.05
0.65
0.36
4.00
5.00
2.71
0.04
4
1 1.71
0.20
1.51
0.60
1 7.06
3.00
5.00
4.36
0.41
5
0.33
0.14
0.19
0.80
1.82
3.00
5.00
3.69
0.14
6
1.53
0.11
1.42
0.60
6.32
2.20
5.00
3.76
0.42
7
0.33
0.10
0.23
0.65
1.48
9.60
5.00
4.17
0.08
8
0.33
0.10
0.23
0.65
1.48
40.00
25.00
9.32
0.05
9
2.76
0.38
2.38
0.60
11.39
1.80
5.00
3.71
1 0.77
10
2.77
0.25
1 2.52
0.60
1 11.43
1.50
5.00
3.42
0.84
11
0.29
0.11
0.18
0.65
1.30
2.10
5.00
3.00
0.13
12
0.22
0.09
0.13
0.65
0.98
1.80
5.00
2.32
0.11
13
0.83
0.04
0.79
0.60
3.43
13.40
5.00
4.79
0.11
14
12.88
0.02
12.86
0.50
44.31
4.30
7.00
2.82
1.75
15
0.39
0.13
0.26
0.60
1.61
7.80
5.00
4.46
0.09
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30