SW4211101_Supplement-EZ Form_20220110

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name
i �—.. Barrow Farms
------------
2 Project Area (ac) -- f 341
3 Coastal Wetland Area (ac) 0
4 Surface Water Area (ac) _ _.0
5 ds thi- s �ro�ect Hi6h or Low Density?_ _ _ _ _ Low
6 Does this project use an off -site SCM? No
NUMBER AND TYPE OF SCMs:
11 Infiltration System-
12 Bioretention Cell
------- ----------------
13 Wet Pond
14
Stormwater Wetland
15
Permeable Pavement
16
Sand Filter
17
Rainwater Harvesting�RWW)
18
19
Green Roof
Level Spreader -Filter Strip--(LS-Fq_..—_--
20
Disconnected Impervious Surface (DIS)
21
Treatment Swale
23
+Silva
StormFilter
24
Cell
25
Bayfiiter
FORMS LOADED
DESIGNER CERTIFICATION
e and Title: JORDAN D. YOUNG, P.E.
_ _
T
nization:
---_ ....._-__
GREEN MOUNTAIN ENGINEERS, PLLCet
address:
7A WENDY CT
State, Zi
. _. _ p------------� --.
GREENSBORO NC 27409 11
_
31
Phone numbers):
336 294-9394 1
32
Email:
J 0 R AN@GREENMOUNTXINENGINEERS CO
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_
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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 densit drainage areas
1
5
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
LID 1
4
Type of SCM
N/A
N/A
5
Total drainage area (sq ft
1,485,396
1,485,396
6
Onsite drainage area (sq ft)
1,485,396
1,485,396
7
Offsite drainage area (sq ft
0
0
8
Total BUA in project (sq ft)
184543 sf
185543 sf
9
New BUA on subdivided lots (subject to permitting)
(sq ft
118767 sf
118767 sf
10permitting)
New BUA not on subdivided lots (subject to
s
65776 sf
65776 sf
11
Offsite BUA (sq ft
sf
sf
12
Breakdown of new BUA not on subdivided lots:
65776
65776
Parking (sq ft
sf
sf
Sidewalk (sq ft)
sf
sf
Roof (sq ft
sf
sf
Roadway s ft
65776 sf
65776 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
Isubdivided lots (sq ft
sf
sf
15permitting)
Existing BUA that will remain (not subject to
s 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
12%
12%
19
Design storm inches
N/A
N/A
20
Design volume of SCM cu ft
N/A
N/A
21
1 Calculation method for design volume
N/A
N/A
ADDITIONAL INFORMATION
22
Please use this space to provide any additional information about the
drainage area(s):
33 LOT SINGLE FAMILY SUBDIVISION

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)
sf
5
Maximum velocity in the vegetated conveyances during the 10-year storm?
2
6
Are curb outlet swales proposed?
No
7
Maximum longitudinal slope of curb outlet swale(s) (%)
N/A
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
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
lAre 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 sloe is 3':1'
Swale
4
FDrainage
Area
ac
BUA
(ac)
Pervious
area
ac
C
Q
(cfs)
Slope
( % )
Va„ow
(fps)
Va ua
(fps)
Flow depth
(ft)
1
0.55
0.10
0.45
0.50
1.88
2.30
2.00
1.05
0.42
2
0.61
0.15
0.46
0.50
2.09
3.30
2.00
1.28
0.48
3
3.50
0.61
2.89
0.50
10.26
3.80
2.00
1.99
0.80
4
1.37
0.42
0.95
0.50
4.69
5.80
2.00
1.96
0.62
5
1.00
0.30
0.70
0.50
3.42
5.20
2.00
1.73
0.54
6
0.55
0.18
0.37
0.50
1.88
2.80
2.00
1.17
0.47
7
1.23
0.37
0.86
0.50
4.21
3.50
2.00
1.58
0.67
8
0.97
0.33
0.64
0.50
3.32
5.10
2.00
1.70
0.54
9
1.60
0.47
1.13
0.50
5.47
5.10
2.00
1.95
0.69
10
5.98
0.33
5.65
0.50
20.45
2.00
2.00
1.93
1.57
11
0.26
0.04
0.22
0.50
0.89
2.00
2.00
0.84
0.35
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30