HomeMy WebLinkAboutSW3221005_Supplement-EZ Form_20230616LOAD SUPPLEMENT FORMS
,OJECT INFORMATION
1
Project Name
Boulder Run
2
Project Area ac
128.169
3
Coastal Wetland Area ac
0
4
Surface Water Area ac
2.496
5
Is this project High or Low Density?
Low
6
IDoes this project use an off -site SCM?
No
IMPLIANCE WITH 02H .1003(4)
7
Width of vegetated setbacks provided feet
30
B
Will the ve atated setback remain vegetated?
Yes
9
If BUA is proposed In the setback, does it meet NCAC 02H.1003 4 c d ?
Yes
10
Is streambank stabilization proposed on this project?
No
IMBER 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
?0
Disconnected Impervious Surface (DIS)
0
?1
Treatment Swale
0
L2
Dry Pond
0
?3
Storm Filter
0
M
Silva Cell
0
25
Ba Ilter
0
?6
FlIterra
0
LOAD SUPPLEMENT FORMS
(SIGNER CERTIFICATION
?7
Name and Title:
Brian LaFranchl
?8
Organization:
Dewberry Engineers Inc.
?9
Street address:
9300 Harris Comers Park -way
10
City, State, Zip:
Charlotte, NC, 28269
0
Phone numbers :
704-631-5206
32
Email:
blafranchi@dewberry.com
iCertification Statement:
11 certify, under penalty of law. that -this Supplement-F.Z fohn and allrsupporting information were prepared under my directio.n.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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Signature of Designer
Date
DRAINAGE AREAS
1 Is this a high density project? No
2 If so, number of drainage areas/SCMs 0
oes this project have low density areas? Yes
4 If so, number of low density drainage areas 1
Is all/part of this project subject to previous rule
5 versions? No
Mai a I.. LD.F.D
DRAINAGE AREA INFORMATION���������������������
Entire Site
LD 1�������
4
T e of SCM
5
Total drainage area (sq ft
5,583,042
5a583,042
6......
Onsite drainage area (sq ft
5..583..0.4.2.................................5.a.583..042.................
7
Offsite drainage area (sq ft)
0
0
8
Total BUA „in project (sq ft)
962698 sf
962698 sf
New BUA on subdivided lots (subject to
9
permitting) (sq ft)
499655 sf
499655 sf
New BUA not on subdivided lots (subject to
10
permitting) (sf)
463043 sf
463043 sf
11
Offsite BUA (sq
12
Breakdown of new BUA not on subdivided lots:
Parking (sq ft)
Sidewalk (sq ft)....
Roof (sq ft)
Roadway (sq 1)
463043 sf
463043 sf
Future (sq ft)
Other, please specify in the comment box
below (sq ft
New infiltrating permeable pavement on
13
subdivided lots (sq ft)
N/A
N/A
New infiltrating permeable pavement not on
14
subdivided lots s ft
N/A
N/A
Existing BUA that will remain (not subject to
15
permitting) (sq ft)
16
Existing BUA that is already permitted (sq ft)
17
Existing BUA that will be removed (sq ft)
18
Percent BUA
19
Design storm (inches)
20
Design volume of SOM (cu ft)
21
Calculation method for design volume
...... ...... ...... ........ ...... ...... ....�
.... ...... ...... ...... ...... ...... ...... ...... ....�
ADDITIONAL_INFORMATION"....
�Please use this space to provide any additional information about the
22
drainage a rea(s)
LOWDENSITY��������������������������������������������������������������������������������
DESIGN RE UIREMENTS 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. 1 003(2)(c)?
Yes
4
Side slopes of the vegetated conveyances (H:V)
2:1, 3:1, 4:1
5
................................................................................................................................................................................................................................................................................................................................................................................................
Maximum velocity in the vegetated conveyances during the 10-year storm?
7.07
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
ADDITIONAL
INFORMATION
15
Please use tnls space °to providenadditional information about this low densityro�ect
any
Vegetated
Conveyances #1, 3, 4, 6A, 613, 12, 14, 15, 16, 17, 19, 20, 22, and 23 have higher slopes and velocities, therefore,
SC250 matting has been proposed for these conveyances and the allowable velocities have been updated below to reflect this
mattin .
Swale
Drainage
BUA
Pervious
Q
Slope
Va„o„
�a«�a,
Flow depth
#
Area
(ac)
area
C
(cfs)
( % )
(fps)
(fps)
(ft)
ac
ac
1
6.49
0.60
27.73
4.20
9.50
6.81
1.16
2
0.48
0.60
2.05
4.20
5.50
3.55
0.44
3
2.28
0.60
9.74
3.90
9.50
5.12
0.80
4
1.96
0.60
8.37
4..5
9.50
5.19
0.73
5
0.19
0.60
0.81
2.50
5.50
2.32
0.34
6
0.73
(6A) --
0.60
3.12
8.00
9.50
5.03
0.46
7
0.66
(7A) --
0.60
2.82
6.10
5.50
4.44
0.46
8
0.31
(8A) --
0.60
1.32
4.00
5.50
3.13
0.38
9
0.30
0.60
1.28
5.30
5.50
3.46
0.35
10
0.86
0.60
3.67
5.50
5.50
4.56
0.52
11
1.45
0.60
6.19
4.10
5.50
4.65
0.67
12
1.91
0.60
8.16
6.60
9.50
5.96
0.68
13
2.26
0.60
9.65
1.70
5.50
3.74
0.93
14
2.47
0.60
10.55
6.00
9.50
5.93
0.51
15
3.20
0.60
13.67
8.00
9.50
7.07
0.53
16
1.44
0.60
6.15
7.10
9.50
5.71
0.60
17
3.31
0.60
14.14
3.00
9.50
5.09
0.97
18
0.58
0.60
2.48
7.00
5.50
4.52
0.43
19
0.97
0.60
4.15
7.00
9.50
5.14
0.52
20
0.98
0.60
4.19
7.00
9.50
5.16
0.52
21
0.72
0.60
3.08
7.10
5.50
4.81
0.46
22
0.88
0.60
3.76
13.00
9.50
6.33
0.44
23
1.62
0.60
6.92
7.00
9.50
5.85
0.63
24
0.29
0.60
1.24
5.80
5.50
3.54
0.34
25
1.30
(6B) --
0.60
5.57
13.50
9.50
6.61
0.29
...............0..Z
...............
O 7B...........................................................................0..60..........................1...1.1...........................4..80..........................5..50..........................3..Z.1...........................0..34............
27
0.41
(813) --
0.60
1.75
2.80
5.50
2.94
0.44
28
29
30