SW4211201_Supplement-EZ Form_20220113

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name
2 Project Area ac
3 Coastal Wetland Area ac
The Grove Subdivision Road
67.15
0
0
4
Surface Water Area ac
5
Is this Droiect High or Low Density?
Low
6
Does this protect use an off -site SCM?
No
COMPLIANCE WITH 02H .1003(4)
7
Width of ve etated setbacks provided feet
N/A
8
Will the vegetated setback remain vegetated?
N/A
9
If BUA is proposed in the setback, does it meet NCAC 02H.1003 4 c-d ?
N/A
10
1 Is streambank stabilization proposed on this project?
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 RWH
18
Green Roof
19
Level Spreader -Filter Strip LS-FS
20
Disconnected Impervious Surface DIS
21
Treatment Swale
0
22
Dry Pond
23
StormFilter
24
Silva Cell
25
Ba filter
IFilterra
26
FORMS LOADED
NER CERTIFICATION
Name and Title:
Organization:
Street address:
City, State, Zip:
Phone number(s):
Email:
John F. Oglesby, PE
CSD Engineering
115 E. Third Street
Wendell, NC 27591
[phone]
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.
Seal
Signature of Designer
Date

DRAINAGE AREAS
1
Is this a high density project?
No
2
If so, number of drainage areas/SCMs
0
3
Does this oroiect have low densit areas?
Yes
4
If so number of low 4-ify 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
5
Total drainage area (sq ft
67.15
6
Onsite drainage area (sq ft
67.15
7
Offsite drainage area (sq ft
8
Total BUA in project (sq ft
72000 sf
9permitting)
New BUA on subdivided lots (subject to
s ft
48000 sf
10
New BUA not on subdivided lots (subject to
permitting) (sf)
24000 sf
11
Offsite BUA (sq ft
12
Breakdown of new BUA not on subdivided lots:
- Parking (sq ft
1000 sf
- Sidewalk (sq ft
- Roof (sq ft
4000 sf
- Roadway s ft
- Future (sq ft
3000 sf
- Other, please specify in the comment box
below (sq ft
13
New infiltrating permeable pavement on
subdivided lots (sq ft
14
New infiltrating permeable pavement not on
subdivided lots (sq ft
15permitting)
Existing BUA that will remain (not subject to
s ft
16
lExistina BUA that is already permitted (sq ft
17
Existing BUA that will be removed (sq ft
18
Percent BUA
3%
19
Design storm inches
20
Design volume of SCM cu ft
21 Calculation method for design volume
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
There are no SCM's proposed; roadside channels will convey stormwater
and provide some treatment; rock check dams will likely be installed to
control velocity; future BUA is for potential horse stables, out buildings, etc.

LOW DENSITY
DESIGN
REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 021-1.1003
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) (% )
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?
N/A
13
Have stormwater outlets been designed to prevent downslope erosion?
Yes
14
Are variations to rule .1003 proposed?
No
ADDITIONAL INFORMATION
15 JPlease use this space to provide any additional information about this low density project:
Roadside channels are not intended to meet MDC for grassed swales; however, some treatment expected. Channel analysis
was done by estimating discharge with Rational formula with same paramters for all anlysis; C=0.6, I10=6.83 in/hr (5-min TOC)
times the drainage areas. Roughness for Class D vegetation was computed in channel analysis worksheet based on FH WA
HEC No. 15 "Design of Roadside Channels with Flexible Lining"