SW4211202_Supplement-EZ Form_20220520

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 :Project Name
2 Project Area ac
Ivy Brook Subdivision
19.16
3
_
Coastal Wetland Area ac
0
4
Surface Water Area ac
0.12
5
Is this r ject High or Low Densi ?
Low
6
Does this project use an off -site SCM?
No
COMPLIANCE WITH 02H .1003(4)
7Width
of ve elated setbacks provided feet
30
Yes
8
Will the vegetated setback remain vegetated?
9
If BUA is proposed in the setback, does it meet NCAC 02H.1003 4 c-d ?
NIA
10
Is streambank stabilization proposed on this project?
No
NUMBER AND TYPE OF SCMs:
11 Infiltration S stem 0
12
Bioretention Cell
0
13
Wet Pond
0
14
iStormwater Wetland
0
15
Permeable Pavement
0
16
1 Sand Filter
0
17
Rainwater Harvestin RWH
0
18
Green Roof
0
19
Level Sreader-Fiiter Strip LS-F5
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
i Name and Title: Kevin Davie
Or anization:— - — Allied Design, Inc.
28
29
-- ._.............
-.--
1 Street address:
4720 Kesler Mill Road
30
Ci , State, Zip:
Winston-Salem, North Carolina 27103
31
Phone numbers :
336.397.1217
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.
t�.•,�N CAR0Z'•.,f
_ c4 SEAL 9r'
023450
"•••.kEvi N oa.,*.
Signature of Designer
Date

DRAINAGE AREAS
1
11s this a h ig h de nsity 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 a
Entire Site
LD 1
4
Type of SCM
5
Total drainage area (sq ft
834578 sf
834578
6
Onsite drainage area (sq ft
834578 sf
834578
7
Offsite drainage areas ft)
8
Total BUA in project (sq ft
200261 sf
200261 sf
9
New BUA on subdivided lots (subject to permitting
(sq ft
168945 sf
168945 sf
10permitting)
New BUA not on subdivided lots (subject to
s
Offsite BUA (sq ft
31316 sf
31316 sf
11
12
Breakdown of new BUA not on subdivided lots:
- Parking (sq ft
- Sidewalk (sq ft
- Roof (sq ft
- Roadway s ft
31316 sf
31316 sf
- Future (sq ft
- Other, please specify in the comment box
below (sq ft
13
New infiltrating permeable pavement on
subdivided lots (sq ft
14
New infiltrating permeable pavement not on
subdivided lots (sq ft
15permitting)
Existing BUA that will remain (not subject to
s ft
16
Existing BUA that is already permitted (sq ft
17
Existing BUA that will be removed (sq ft
18
Percent BUA
24%
24%
19
Design storm inches
20 Design volume of SCM cu ft
21 Calculation method for design volume
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):

LOW DENSITY
DESIGN
REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H .1003
Is project below density thresholds set forth in the applicable stormwater rule? Yes
1
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?
6
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?
N/A
13
Have stormwater outlets been designed to prevent downslope 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:
Regarding Item #12, the current drainage pattern flows into (2) existing ditches, which are to remain
Temporary stabilization (rated for 24-months) specified for all ditches, regardless of calculations.
" Vallow values from the NCDEQ Stormwater Design Manual (C-11, 4-5.5 fps max. per MDCs 4 & 5) or from calculations from the
NAG software (ECMDS v7.0).
" Permanent stabilization specified to meet Vactual.
Swale
#
Drainage
Area
BUA
(ac)
Pervious
aarea
C
Q
(cfs)
Slope
(%)
Vall°w
(fpS)
Vactual
(fpS)
Flow depth
(ft)
1
0.30
0.12
0.18
0.59
1.23
2.50
5.5"
1.66
0.26
2
0.96
0.47
0.49
0.64
4.29
4.48
5.5"
3.52
0.39
3
1.46
0.77
0.69
0.67
6.77
1.59
5.5"
2.44
0.68
4
1.88
0.98
0.90
0.66
8.67
5.01
5.5"
4.78
0.51
5
0.27
0.07
0.20
0.50
0.94
4.48
5.5"
1.98
0.19
6
1.67
0.55
1.12
0.55
6.38
5.00
5.5"
4.29
0.45
7
0.53
0.30
0.23
0.69
2.55
5.00
5.5"
3.07
0.29
8
0.19
0.03
0.17
0.43
0.57
1.59
5.5"
0.99
0.22
9
0.35
0.14
0.21
0.60
1.45
1.59
5.5"
1.41
0.34
10
0.96
0.28
0.68
0.53
3.52
5.01
5.5"
3.46
0.34
11
2.60
0.86
1.74
0.55
9.90
24.50
2.00
8.24""
0.25
12
7.67
1.11
6.56
0.44
23.28
6.70
2.00
7.18"`
0.57
13
14