SW6220907_Supplement EZ Form_20221006

SUPPLEMENT-EZ COVER PAGE
F013MS LOADED
PROJECT INFORMATION
1 I Project Name Mason Landing Subdivision
2 [Project Area (ac) 20.06
_3. 'Coastal Wetland Area (ac) p
4 Surface Water Area (ac*p
5 tls, hfs projeu� Hlqh or Low DensEty? Low
6 [Does this project use an off -site SCNf? No
COMPLIANCE WITH 02H .1
7 Width of vegetated setbacks provided (feet) 30
_8 _i Will the vegetated setback remain vegetated? Yes
9 If BUA Is proposed in the setback, does it meet NCAC 02H.1003(4)(c-d)? _ _ _ N/A
10 Is streambank stabilization proposed on this project? No
NUMBER AND TYPE OF SCMs:
11
Infiltration System_
12
1 Bioretentign Cell
13
1 Wet Pond
14
Stormwater Wetland
15
Permeable Pavement i
16
Sand Filter
17
Rainwater Halrrrestin (RWH)
18
Green Roof
19
Level S reader -Fitter Strip (LS-F$}
20
!Disconnected Im ervinus Surface
21
Treatment Swale
22
Dry Pond
23
IStormFilter
24
•Silva .Cell
25
Bayfilter
26
Filterra
FORMS LOADED
DESIGNER CERTIFICATION
27
j Name and Title:
Jared Matthews, PE
28
1Or anixation;
The Curry 91neering Group, PLLC
29
Street address:
205 South Fuguay Avenue
30
Ci} ., State, Zip:
i=.utlus 4arina, NC 27126
31
Phone number(si:
9195520849 x105
32
Email:
[e-mail]
Cerliflcatian 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.
peshgner
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DRAINAGE AREAS
- 1 I_s this a high density project? No
2 If so, number of drainage areWSCMs 0. _
3 D_ oes this project have low -density areas? Yes
4 If so, number of low de-nsHy drainage areas 1
Is all/part of this project subject to previous rule
5 versions? No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
LID 1
4 !Type of SCM
No SCM
5 Total drainage area (sg ft
_
873814
6
1 Onsite drainage area (sq ft)
873814
7
1 Offsite drainage area (sq ft)
8
Total BUA in project (sq ft)
133415 sf
9
New BUA on subdivided lots (subject to permitting)
(sq ft
110000 sf
10permitting)
New BUA not on subdivided lots (subject to
s
11
Offsite BUA (sq ft)
12
Breakdown of new BUA not on subdivided lots:
Parkin (sq ft)
88000 sf
Sidewalk (sq ft)
22000 sf
23415 sf
I - Roof (sq ft
i - Roadway s ft
Future (sq ft
Other, please specify in the comment box
below (sq ft)
New infiltrating permeable pavement on
subdivided lots (sq ft
13
14
New infiltrating permeable pavement not on
subdivided lots s ft)
15
Existing BUA that will remain (not subject to
permittinsqft
16
Existing BUA that is already permitted (sq ft
5000 sf
Existin BUA that will be removed s ft
5000 sf
18
Percent BUA
15%
r17
19
Desi n storm (inches
20
Design volume of SCM cu ft
21 Calculation method for desi 2n volume
ADDITIONAL INFORMATION
22
Please use this space to provide any additional information about the
drainage area(s):

LOW DENSITY
IREIM W S FOR LOW DENSM PR Eta MOk-DIff
1
2
Is project below density thresholds set forth in the applicable stormwater rule?
Does project maximize dispersed flow and minimize channelization of flow?
Yes
Yes
3
Has the use of piping been minimized per .1003(2)(c)?
Yes
4
Side slopes of the ve eg fated conveyances.(H:V)
3 sf
5 ,Maximum
_
velocity in the vegetated conveyances during the 10-year storm?
4.46
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)
Maximum side slope of curb outlet swale(s) (H:V)
-
3:1
9
10
Minimum length of curb outlet swale(s) (feet)
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
14 ,Are
Have stormwater outlets been designed to prevent downslope erosion?
variations to rule .1003 proposed?
Yes
No
ADDITIONAL INFORMATION ..
15 1piease use this space to provide any additional information about this low density project:
The side slopes of the ditch sections are 3:1 but the form has added'sf for some reason. ALL temporary diversion ditches will be
converted to permanent vegetated swales. See calculations below.
Swale
#
Drainage Pervious
Area BUA area C Q Slopa V... � V.� , Flow depth
ac (ac) ac (cfs) (%) (fPs) (fps) (n)
1
2
2.54 0.45 2.09 0.30 5.99 1.24 2.00 3.28
3.64 0.63 3.01 1 0.30 8.58 1.85 2.00 4.17
0.52
0.56
3
1.18
0.23
0.95
0.30
2.78
1.49
2.00
2.17
0.40
4
2.17
0.44
1.73
0.30
5.12
+ 2.19
2.00
2.95
0.50
6
f
6
7
8
9
- 10
Z
11
12
13
14
15
16
17
18
19
20
21
22
23
- -
24
25
'
26
27
G
28
29
30
'