SW6220506_Supplement-EZ Form_20220914

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
.PROJECT INFORMATION
1 I Project Name _
2 Project Area ac
Williford Cove
83.59
3
_
Coastal Wetland Area ac
4
Surface Water Area ac
0.58
5
Is this ra'ect High or Low Dens' ?
Low
6
Does this project use an off -site SCM?
No
COMPLIANCE WITH 021-1.100 4j
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 ?
_
NIA l
10
Is streambank stabilization proposed on this project?
No
NUMBER AND TYPE OF SCMs:
11
12
Infiltration System
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
_Rayftiter
26
Filterra
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
Organization:
Street address:
City, State, Zip:
Phone number(s)7
Email:
Jeffrey A. Nobles, PE
28
_ _ _
Larry King & Assoc. RLS, PA ^�
29
1333 Morganton Road, Suite 200
30
Fayetteville, NC 28305
31
910-483-4300
32
_
innhlaa6illknnda r•.nm
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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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 areas
1
5
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE AREA INFORMATION
4 Type of SCM
Entire Site
nla
5
Total draina a area (sq ft
3664180
6
Onsite drainage area (sq ft
7
Offsite drainage area (sq ft
8
Total BUA in project (sq ft
371310 sf
9
New BUA on subdivided lots (subject to permitting)
(sq ft
220000 sf
10permitting)
New BUA not on subdivided lots (subject to
s
151310 sf
11
Offslte BUA (sq ft
12
Breakdown of new BUA not on subdivided lots:
- Parkin ft
sf
- Sidewalk ft
- Roof Lsq ft
- Roadwa s ft
- Future (sq ft
- Other, please specify in the comment box
below (sq ff
sf
sf
151310 sf
sf
sf
13
New infiltrating permeable pavement on
subdivided lots ft
sf
14
New infiltrating permeable pavement not on
subdivided lots (sq tt
sf
15permitting)
Existing BUA that will remain (not subject to
s ft
sf
16
Existing BUA that is already permitted ft
sf
17
Existing BUA that will be removed (sq ft
sf
18
Percent BUA
10%
19
Design storm inches
.0 in
20
Design volume of SCM tom ft
cf
21
Calculation method for design volume
Cf
ADDITIONAL INFORMA71ON
22
Please use this space to provide any additional information about the
drainage areas :
LD 1
Wa
3664180
371310 sf
220000 sf
151310 sf
sf
sf
sf
151310 sf
sf
sf
sf
sf
.0 in
cf
0

LOW DENSITY
DESIG
REQUIREMENTS OR LOW DENSrrY PR FROM 021-1.211311113
1
Is project below density thresholds set forth in the applicable stormwater rule?
Does project maximize dispersed flow and minimize channelization of flow?
Has the use of pipirg been mininvzed per.1003(2)(c)?
Yes
2
Yes
3
Yes
4
_ _
Side slopes of the vegetated conveyances (H:V)
Maximum velocity in the vegetated conveyances during the 1 D-year storm?
sf
5
2.21
No
6
Are curb outlet swales proposed?
7
Maximum longitudinal slope of curb outlet swale(s) ("/u)
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} )
11
Are treatment swales used instead of curb outlet swales?
12
Is stormwater released at the edge of the setback as dispersed flow?
Yes
Yes
13 _
14
Have stormwater outlets been designed to prevent downsl_ope erosion?
Are variations to rule .1003 proposed?
No
ADDITIONAL INFORMATION
15 Please use this space to provide any additional information about this low density project:
LINE 4: All side slopes are 3:1 or flatter.
Swale
#
Drainage
1*0 Area
BOA
(ac)
Pervkm
area
C
Q
(cfs)
Slope
N
V„r,,
(fps)
V,d„r Flow depth
(fin) (ft)
1
0.86
0.44
0.56
0.61
4.14
0.50
5.00
1.65
0.85
2
0.89
0.56
0.44
0.67
4.77
0.50
5.00
1.70
0.89
3
1.95
1.00
0.95
0.61
9.39
0.08
5.00
0.99
1.48
4
0.31
0.15
0.16
0.60
1.44
0.50
5.00
1.27
0.57
5
0.27
0.14
0.13
0.62
1.32
0.50
5.00
1.24
0.55
6
0.32
0.21
0.11
0.69
1.74
0.50
5.00
1.33
0.61
7
1.71
0.90
0.81
0.62
8.34
0.50
5.00
1.96
1.10
8
0.44
0.23
0.21
0.61
2.12
0.50
5.00
1.39
0.66
9
0.88
0.52
0.36
0.65
4.57
0.50
5.00
1.69
0.88
10
0.53
0.28
0.25
0.62
2.60
0.50
5.00
1.47
0.71
11
3.70
1.93
1.77
0.61
17.97
0.10
5.00
1.26
1.88
12
3.92
2.05
1.87
0.61
19.04
0.10
2.00
1.28
1.93
13
0.63
0.34
0.29
0.62
3.10
0.50
5.00
1.53
0.76
14
0.77
0.45
0.32
0.65
3.96
0.60
5.00
1.63
0.83
15
1.48
0.79
0.69
0.62
7.25
0.10
5.00
1.01
1.34
16
1.65
0.83
0.82
0.60
7.87
0.50 1
5.00
1.93
1.08
17
0.93
0.51
0.42
0.63
4.64
0.50
5.00
1.69
0.88
18
0.53
0.35
0.18
0.69
2.91
0.50
5.00
1.51
0.74
19
0.48
0.23
0.25
0.59
2.22
0.50
5.00
1.41
0.67
20
2.70
1.48
1.22
0.63
13.45
0.50
5.00
2.21
1.32
21
4.50
2.31
2.19
0.61
21.68
0.10
2.00
1.33
1.90
22
23
24
25
26
27
28
29
30