SW1220701_Supplement-EZ Form_20221128

SUPPLE6lf ENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name All About Plumbing Building Addition
2
Project Area (ac)
3.15
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 Width of vegetated setbacks provided (feet
8 1 Will the vegetated setback remain vegetated?
9 Ilf BUA is proposed in the setback, does it meet NCAC 02H.1
10 Ils streambank stabilization proposed on this project?
No
N/A
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
1 StormFilter
0
24
Silva Cell
0
25
Bayfilter
0
26
Filterra
0
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
J. David McCutchen, P.E.
28
Organization:
McCutchen Engineering Associates, PC
29
Street address:
898 West Saint John Street
30
City, State, Zip:
Spartanburg, SC 29301
31
Phone number(s):
864-582-0585
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.
Designer
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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
2
5
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE AREA INFORMATION �7j' Entire Site
4 Type of SCM
LID 1
LID 2
Grass Swale #1
Grass Swale #2
5
Total drainage area (sq ft
137,214
35719
11761
6
Onsite drainage area (sq ft
137,214
35719
11761
7
Offsite drainage area (sq ft
0
H 0
0
8
Total BUA in project sq ft
57935 sf
25700 sf
6535 sf
9
New BUA on subdivided lots (subject to permitting)
(sq ft
N/A
N/A
N/A
10permitting)
New BUA not on subdivided lots (subject to
s
32235 sf
25700 sf
6535 sf
11
Offsite BUA (sq ft
N/A
N/A
N/A
12
Breakdown of new BUA not on subdivided lots:
- Parking (sq ft
25700 sf
25700 sf
N/A
- Sidewalk (sq ft
N/A
' N/A
N/A
- Roof (sq ft
6535 sf
N/A
6535 sf
- Roadway sq ft
N/A
N/A
N/A
- Future (sq ft)
N/A
N/A
N/A
- Other, please specify in the comment box
below (sq ft)
N/A
N/A
N/A
13
New infiltrating permeable pavement on
subdivided lots (sq ft
N/A
N/A
N/A
14
New infiltrating permeable pavement not on
subdivided lots (sq ft)
N/A
N/A
N/A
15permitting)
Existing BUA that will remain (not subject to
s ft
25700 sf
N/A
N/A
16
Existing BUA that is already permitted (sq ft
sf
sf
sf
17
Existing BUA that will be removed (sq ft
N/A
N/A
N/A
18
Percent BUA
42%
72%
_
56%
19
Design storm (inches)
7.1 in
7.1 in
20
Design volume of SCM (cu ft)
N/A
N/A
21
1 Calculation method for design volume
N/A
N/A
(ADDITIONAL INFORMATION
I
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?
0.46
6
Are curb outlet swales proposed?
No
7
Maximum longitudinal slope of curb outlet swale(s) (%)
N/A j
8
Bottom width of curb outlet swale(s) (feet)
N/A
9
Maximum side slope of curb outlet swale(s) (H:V)
N/A
10
Minimum length of curb outlet swale(s) (feet)
N/A
Are treatment swales used instead of curb outlet swales?
No
P111
2
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?
ADDITIONAL INFORMATION
15 Piease use this space to provide any additional information about this low density project:
No
Swale
#
Drainage
Area
ac
BUA
(ac)
Pervious
area
re(ac
C
Q
(cfs)
Slope
N
V,11ow
(fps)
V.-.1
(fps)
Flow depth
(ft)
1
0.82
0.57
0.25
0.77
4.50
5.00
1.99
0.46
1.50
2
0.27
0.15
0.12
0.68
1.30
2.00
1.26
0.13
1.50
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28