SW5201001_Supplement-EZ Form_20230622

SUPPLEMENT-EZ COVER PAGE
Frafts i_c7nt�rt:r
-
WITH
7 rWidth_Ljf.,yeLetated setbacks provi
W
8 Will the veqetated setback remain
-L-- If _qUA is proposed in the setback, does it meet NCAC H.1003 (4
10 � Is streambank stabilization proposed on this project?
50
Yes
No
Certification _Statement:
I certify, Linder 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,
Sig e Designer atu, f "Dsigner
Date

LOW DENSITYu..9 y
1DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H .1003
1
Is project below density thresholds set forth in the applicable stormwater rules
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)
sf
5
Maximum velocity in the vegetated conveyances during the 10-year storm? _
4.27
6
Are curb outlet swales proposed?
No
7
Maximum longitudinal slope of curb outlet swale(s)
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) (feet)
11
Are treatment swales used instead of curb outlet swales?
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
INFORMATION
Please use this space to provide any additional information about this low
The side slopes of the swales varry from 3:1 to 15:1.
Swale
#
1
Drainage
Area
ac
0.14
BUA
(ac)
0.05
Pervious
area
ac
0.09
C
0.60
C1
(cfs)
0.55
'Slope
N
0.02
V,�i,w
(fps)
4.50
V, n,,,i
(fps)
1.02
Flow depth
(ft)
0.19
2
0.14
0.05
0.09
0.60
0.55
0.02
4.50
1.14
0.22
3
0.17
0.05
0.12
0.56
0.63
0.02
4.50
1.19
0.23
4
0.16
0.03
0.13
0.50
0.53
0.13
4.50
2.44
0.16
5
0.18
0.06
0.12
0.58
0.70
0.07
4.50
1.82
0.16
6
0.18
0.06
0.12
0.58
0.70
0.07
4.50
1.82
0.16
7
0.18
0.06
0.12
0.58
0.70
0.07
4.50
1.82
0.16
8
0.18
0.06
0.12
0.58
0.70
0.07
4.50
1.82
0.16
9
0.18
0.06
0.12
0.58
0.70
0.07
4.50
1.82
0.16
10
0.18
0.06
0.12
0.58
0.70
0.07
4.50
1.82
0.16
11 `
0.22
0.06
0.16
0.55
0.80
0.07
4.50
2.96
0.30
12
0.20
0.06
0.14
0.57
0.75
0.07
4.50
2.97
0.29
13
0.56
0.10
0.46
0.50
1.85
0.10
4.50
4.27
0.38
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