SW4221201_Supplement-EZ Form_20221207

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1
lProjectNarne
Salem Brooke Subdivision
2
Project Area ac
13.55 ---_
3
Coastal Wetland Area {ac
0
4
Surface Water Area ac
0.04
5
Is this project High or Low Density?
Low
8
Does [his project use an off site SCM?
No
COMPLIANCE WITH 02H .1003(4)
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(D o:q? _ _
NIA
to
Is streambank stabilization proposed on this project?
No
NUMBER AND TYPE OF SCMs:
11
infiltration System
12
Biaretentiort Coll
13
Wet Pond
14
Stormwater Wetland
—
15
Permeable Pavement
16
Sand Fitter
17
Rainwater Harvesting RWH
r
18
Green Roof
19
Level Spreader -Filter
20
Disconnected Im arvious Surface DIS
21
Treatment Swale
22
PR Pond
23 J
Storm Filter
24
ISilva Cell
25
1Bayfilter
_ —
26
iRlterra
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and TiLe:
James L. Walters, P.E.__
28
Or anlzation:
_
Latham -Walters En ineerin , Inc.
29
Street address:
16507-A NoAhcross Drive
30
Citty, State, Zi
Huntersville, NC 28078
31
Phone numbers :
704-807-4134
32
_
Email:
jlmriillwengineer.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.
10
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Signature of Designer
Data
// 212 - 201? z

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
Entire Site
LD 1
4
Type of SCM
N/A
N/A
5
Total drainage area (sq ft)
1,089,321
1,089,321
6
Onsite drainage area (sq ft)
575,806
575,806
7
Offsite drainage area (sq ft)
513,515
513,515
8
Total BUA in project (sq ft)
185679 sf
185679 sf
9
New BUA on subdivided lots (subject to permitting)
(sq ft)
67600 sf
67600 sf
10
New BUA not on subdivided lots (subject to
permitting) (so
33327 sf
33327 sf
11
Offsite BUA (sq ft)
61352 sf
61352 sf
12
Breakdown of new BUA not on subdivided lots:
Parking (sq ft)
sf
sf
Sidewalk (sq ft)
sf
sf
Roof (sq ft)
sf
sf
Roadway (sq ft)
33327 sf
33327 sf
Future (sq ft)
sf
sf
Other, please specify in the comment box
below (sq ft)
sf
sf
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
permitting) (sq ft)
sf
sf
16
Existing BUA that is already permitted (sq ft)
sf
sf
17
Existing BUA that will be removed (sq ft)
sf
sf
18
Percent BUA
17%
17%
19
Design storm (inches)
N/A
N/A
20
Design volume of SCM (cu ft)
N/A
N/A
21
Calculation method for design volume
N/A
N/A
DDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
26 Lot single family subdivision

LOW DENSITY
DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H .1003 am
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?
5.67
6
Are curb outlet swales proposed?
No
7
Maximum longitudinal slope of curb outlet swale(s) (%)
na
8
Bottom width of curb outlet swale(s) (feet)
na
9
Maximum side slope of curb outlet swale(s) (H:V)
na
10
Minimum length of curb outlet swale(s) (feet)
na
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 Please use this space to provide any additional information about this low density project:
Line 4 does not format properly. Maximum side slo e is 3:1
Swale
#
Drainage
Area
ac
BUA
(ac)
Pervious
area
ac
C
Q
(cfs)
Slope
N
Va„ -
(fps)
V.-.1
(fps)
Flow depth
(ft)
1
0.79
0.09
0.70
0.45
2.45
1.82
5.00
1.41
0.50
2
0.39
0.06
0.33
0.45
1.21
1.82
5.00
1.08
0.36
3
1.20
0.61
0.59
0.45
4.13
4.08
5.00
2.70
0.45
4
1.42
0.41
1.01
0.45
4.89
3.39
5.00
2.60
0.53
5
0.40
0.14
0.26
0.45
1.38
5.00
5.00
1.96
0.25
6
0.50
0.23
0.27
0.45
1.72
2.16
5.00
1.36
0.40
7
1.59
0.59
1.00
0.45
5.48
4.88
5.00
3.32
0.48
8
0.61
0.25
0.36
0.45
2.10
3.14
5.00
1.80
0.37
9
0.29
0.13
0.16
0.45
1.00
2.82
5.00
1.26
0.28
10
4.38
0.65
3.73
0.45
11.10
1.12
5.00
1.86
1.11
11
5.32
0.09
5.23
0.45
13.49
5.16
5.00
4.80
0.69
12
0.67
0.36
0.31
0.45
2.31
2.16
5.00
1.52
0.45
13
4.64
0.50
4.14
0.45
10.79
4.27
5.00
3.97
0.67
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30