SW3181201_Supplement-EZ Form_20220831

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PRO TCEJ INFORMATION
1
Project Name
Rob Wallace Park - Phase IIB
2
Project Area ac
148.36
3
Coastal Wetland Area ac
0
4
Surface Water Area ac
24.88
5
Is this proiect Hi h or Low Densit ?
Low
6
Does this pro}ect use an off -site SCM?
No
COMPLIANCE WITH 02H .1003(4) _
7
'Width of vegetated setbacks rovided 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
10
Is stream bank stabilization proposed on this project?
No
NUMBER AND TYPE OF SCM9:
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 Harvesti� LWH
0
18
Green Hoof
0
19
Level Spreader -Filter 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
DESIGNER CERTIFICATION
27
29
30
31
32
FORMS LOADED
Name and Title: __ ....
Organization:
Street address;
City, State, Zip:
Phone number(s):
Email:
Matthew Blackmon, Project Engine
Alfred Benesch & Associates
2359 Perimeter Pointe Parkway, Suit+
Charlotte, NC 28208
7048315686
M blackm on ll� benesch. 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.
��Z� A, S 10
Iz
Z I CF Alll�r�
Signature of Designer
9/sal zz.
Date

DRAINAGE AREAS
1
Is this a hi h density project?
No
2
It so, number of drainage areaslSCMs
0
3
Does this project have low density areas?
Yes
4
If so, number of low density drainage areas
1
5
Is all/pan of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE
4
AREA INFORMATION Entire Site LD 1
T e of SCM
Total drains a area (sq ft6462561
Onsite drainage area (sq ft 6462561
Offsite drainage areas ft 0
Total BUA in project s ft 432386 sf
New BUA on subdivided lots (subject to u
s ft
5
6
7
B
9permitting)
10
New BUA not on subdivided lots (subject to
ermittin sf
28475 sf
11
Oftsite BUA (sq h
12
Breakdown of new BUA not on subdivided lots:
- Parking (sq ft
10367 sf
- Sidewalk (sq ft
4573 sf
- Roof (sq ft
3513 sf
Roadway s ft
10022 sf
- Future (sq ft
Other, please specify in the comment box
below (sq ftt
13
T
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_Jsgft) 403913 sf
17 Existing BUA that will be removed (sq ft)
18 Percent BUA 7%
19 Desi n 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 jdrainage area(s):

LOW DENSITY
DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FRONT 021-1.1003
1
Is project below density thresholds set iorth 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)
3:1
5
Maxmum velocity in the vegetated conveyances during the 10-year storm?
4.58
6
Are curb outlet swales proposed?
No
7
Maximum longitudinal slope of curb outlet swale(s) (%)
a
Bottom width of curb outlet swales) (feet)
9
Maximum side slope of turn 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 stosmwater released at the edge of the setback as dispersed flow?
No
13 Have stormw_ater outlets been designed to prevent downslope erosfon? Yes
14 Are variations to rule .1003 proposed? No
AODITIONAL INFORMATION
15 Please use this space to provide any additional information about this low density project:
This project involves the construction of a playground, restroom, and picnic shelters near the recently completed Rob Wallace
Park Phase 2 improvements. In addition to the structures, a new 23 space parking lot to serve the proposed amenities, as well
as several short crushed concrete walking trail connectors. The project will be constructed in a single phase starting with the
construction of the structures and playground and ending with the parking lot construction. during construction, there wiil also be
an extension of the private water main that parallels the ark road to serve a new hydrant and restroom.
Swale
if
Drainage BUA Pervious Q Slope V,mw V.Flow depth
Area (ac) area L
ac ac (cfs) N (fps) (fps) (ft)
1
2
3
4
5
6
7
8
9
10
12
1.76 0.16 1.60
2.50 0.47 2,03
2.95 0.52 2.43
1.55 1.12 0.43
0.78 0.11 0.67
0.51 0.20 0.31
0.48 0.32 0.16
0.15 0.11 0.03
0.19 0,11-.--^-�`0.08
0.12 0.09 0.03
36
42
41
4.68
1.88
5,00
3.10
4.58
0.45
0.49
0.60
0.60
7.79
3.74
5.00
9.02
2.32
5.00
3.96
77
8.79
2.22
5.00
3.86
39
2.25
1.88
5.00
2.46
0.31
55
2.08
3.58
5.00
3.03
0.25
74
2.61
1.06
5.00
2.11
0.39
83
0.89
3,39
5.00
2.19
0.16
67
0.95 -
2.55
3.32
5.00
5.00
2.08
2.10
0.18
0.14
80
0.71
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16
17
18 .
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20
21
22
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25
26
27
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