SW3191203_Supplement-EZ Form_20200206

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT
INFORMATION
1
Project Name
Trinity Ridge subdivision Sect 2
2
Project Area ac
10.61
0
3
Coastal Wetland Area ac
4
Surface Water Area ac
0
5
Is this project High or Low Density?
Low
6
Does this project use an off -site SCIVI?
No
WITH 02H .1003(4)
7 lWidth of vegetated setbacl
8 Will the vegetated setback
9 Ils BUA other that as listed in .1003 4 c d out of the setback? I NIA
10 Ils streambank stabilization proposed on this project? I NIA
NUMBER AND TYPE OF SCMs:
11
Infiltration System
0
12
Bioretention Cell
0
13
Wet Pond
0
14
Stormwaler 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
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
IFilterra
0
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
Kevin E. Herring PE
28
Or anization:
Kevin E. Herring En ineerin
29
Street address:
16101 Silver Rd
30
City, State Zip:
Oakboro NC 28129
31
Phone numbers :
980-621-0935
32
1 Email:
[e-mail]
Certification Statement:
I certify, under penalty of law that this Supplement-FZ 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.
CARO<i•f•,
_ SEAL
20165 _
Si re of Designer
� y .2azo
Date

DRAINAGE AREAS
1
Is this a high density project?
No
2
If so, number of drainage areas/SCMs
1
3
Is all/part of this project subject to previous rule
versions?
I No
CLICK TO LOAD FORM
DRAINAGE AREA INFORMATION
Entire Site
4
Type of SCM
Vegetative Swale
5
Total BUA in project (sq ft
110614 sf
6permitting)
New BUA on subdivided lots (subject to
s ft
79200 sf
7permitting)
New BUA outside of subdivided lots (subject to
s
31414 sf
8
JOfFsite -total area (sq ft
9
Offsite BUA (sq ft
10
Breakdown of new BUA outside subdivided lots:
- Parking (sq ft
4160 sf
-Sidewalk (sft
- Roof (sq ft
- Roadway s ft
27200 sf
- Future (sq ft
- Other, please specify in the comment box
below (sq ft
54 sf
11
New infiltrating permeable pavement on
subdivided lots (sq ft _
New infiltrating permeable pavement outside of
subdivided lots (sq ft
12
13permitting)
Exisitng BUA that will remain (not subject to
s ft
14
Existing BUA that is already permitted (sq ft
15
Existina BUA that will be removed (sq ft
16
Percent BUA
23.93%
17
Design storm inches
18
IDesign volume of SCM cu ft
19
lCalculation method for design volume
DITIONAL INFORMATION
Please use this space to provide any additional information about the
20 drainage area(s):
54sf OTHER BUA is concrete pad used for Cluster Mailbox
Driveways in R/W
Vew 20' Street

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)
<_ 3:1
5
Maximum velocity in the vegetated conveyances during the 10-year storm?
2.16 fps
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
JAre variations to rule .1003 proposed?
No
ADDITIONAL INFORRMTION
15
1 Please use this space to provide any additional information about this low density project:
Rooadside ditches to be utilized for required treatment conveyances.
Drainage
Pervious
Swale
BUA
Q
Slope
Va„ow
Vac[ual
#
Area
(ac)
area
C
(cfs)
(%)
(fps)
(fps)
Flow depth (ft)
ac
ac
0.37
1
0.22
Varies
0.50
0.84
1.50
4.50
1.38
2
1.09
Varies
0.50
4.24
1.00
4.50
1.78
0.76
3
1.30
Varies
1
0.50
1 5.03
1 1.50
1 4.50
1 2.16
1 0.75
4
5