SW6210601_Supplement-EZ Form_20211008

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 lProiectName
I Graceland Subdivision I
2
jProject Area ac
55.76
3
Coastal Wetland Area ac
0
4
Surface Water Area ac
5
Is this project High or Low Density?
Low
6
1 Does this protect use an off -site SCM?
No
COMPLIANCE WITH 02H .1003(4)
7
Width of vegetated setbacks provided feet
8
Will the vegetated setback remain vegetated?
9
If BUA is proposed in the setback, does it meet NCAC 02H.1003 4 c-d ?
10
1 Is streambank stabilization proposed on this project?
NUMBER AND TYPE OF SCMs:
11
Infiltration System
12
Bioretention Cell
13
Wet Pond
14
Stormwater Wetland
15
Permeable Pavement
16
Sand Filter
17
Rainwater Harvesting RWH
18
Green Roof
19
Level Spreader -Filter Strip LS-FS
20
Disconnected Impervious Surface DIS
21
Treatment Swale
22
Dry Pond
23
StormFilter
24
Silva Cell
25
Ba filter
IFilterra
26
FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title:
28 Or anization:
C. Scott Brown, PE
4D Site Solutions, Inc.
29
Street address:
409 Chicago Drive - Suite 112
30
City, State, Zip:
Fayetteville, NC 28306
31
Phone numbers :
910-426-6777
32
Email:
sbrown(a)4dsitesolutions.com
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.
Seal
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 oroiect have low densit areas?
Yes
4
If so number of low 4-ify 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
Vegetated
Conveyances
Vegetated
Conveyances
5
Total drainage area (sq ft
2,428,774
2,428,774
6
Onsite drainage area (sq ft
2,428,774
2,428,774
7
Offsite drainage area (sq ft
0
0
8
Total BUA in project (sq ft
582876 sf
582876 sf
9
New BUA on subdivided lots (subject to
ermitting) (sq ft
379647 sf
379647 sf
10
New BUA not on subdivided lots (subject to
permitting) (s
Offsite BUA (sq ft
lBreakdown of new BUA not on subdivided lots:
- Parking (sq ft
- Sidewalk (sq ft
203229 sf
203229 sf
sf
11
sf
12
27709 sf
27709 sf
- Roof (sq ft
- Roadway s ft
175520 sf
175520 sf
- Future (sq ft
- Other, please specify in the comment box
below (sq ft
13
New infiltrating permeable pavement on
subdivided lots (sq ft
sf
sf
14
New infiltrating permeable pavement not on
subdivided lots (sq ft
sf
sf
15
Existing BUA that will remain (not subject to
ermitting) (sq ft
sf
sf
16
lExistina BUA that is already ermitted (sq ft
sf
sf
17
Existing BUA that will be removed (sq ft
4105 sf
4105 sf
18
Percent BUA
24%
24%
19
Design storm inches
20
Design volume of SCM cu ft
21
Calculation method for design volume
ADDITIONAL INFORMATION
22
Please use this space to provide any additional information about the
drainage area(s):

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?
4.5
6
Are curb outlet swales proposed?
Yes
7
Maximum longitudinal slope of curb outlet swale(s) (%)
5
8
Bottom width of curb outlet swale(s) (feet)
2 It
9
Maximum side slope of curb outlet swale(s) (H:V)
3:1
10
Minimum length of curb outlet swale(s) (feet)
100 It
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
Are variations to rule .1003 proposed?
No
ADDITIONAL INFORMATION
15 1131ease use this space to provide any additional information about this low density project:
Swale
#
Drainage
Area
ac
BUA
(ac)
Pervious
area
ac
C
Q
(cfs)
Slope
M
V,,,o„,
(fps)
V,.,,,,
(fps)
Flow depth
(ft)
1
1.06
0.08
0.98
0.35
1.43
0.75
4.50
129
0.35
2
3.32
026
3.06
0.35
4.47
0.70
4.50
1.48
0.73
3
2.84
022
2.62
0.35
3.83
0.50
4.50
1.50
0.83
4
1 1.97
0.61
1.36
0.50
3.79
0.75
2.00
1 1.51
0.84
5
0.72
0.17
0.55
0.45
2.55
1.00
2.00
1.71
0.45
6
4.30
0.99
3.31
0.45
7.45
0.50
2.00
1.77
0.90
7
1.39
0.43
0.96
0.50
3.71
0.50
2.00
1.46
0.64
8
5.09
0.78
4.31
0.40
7.84
0.60
4.50
1.91
0.88
9
2.65
0.61
2.04
0.45
4.60
1.80
4.50
2.48
1 0.52
10
1.49
0.34
1.15
0.45
3.57
1.90
4.50
1.89
0.53
11
1.95
0.30
1.65
0.40
3.01
0.30
4.50
1.15
0.66
12
1.65
0.38
127
0.45
2.85
0.30
4.50
1.14
0.65
13
1927
4.45
14.82
0.45
33.38
1.00
4.50
3.77
1.42
14
1949.
4.50
14.99
0.45
33.77
120
4.50
3.98
1.38
15
5.32
123
4.09
0.45
921
0.80
4.50
2.03
0.94
16
25.91
5.98
1993.
0.45
1 44.89
0.70
2.00
1.85
2.53
17
1.77
0.41
1.36
0.45
3.06
0.60
4.50
1.53
0.74
18
0.53
024
029
0.60
2.50
0.50
4.50
1.32
0.53
19
1.69
0.39
1.30
0.45
2.92
0.50
4.50
1.37
0.57
20
3.35
0.77
2.57
0.45
5.80
1.50
4.50
1.36
0.47
21
3.96
0.91
3.04
0.45
6.85
0.60
4.50
128
0.54
22
4.68
1.08
3.60
0.45
8.10
4.00
4.50
2.14
0.44
23
1.57
0.36
121
0.45
2.72
0.50
4.50
1.35
0.55
24
25
26
27
28
29
30