SW6201004_Supplement EZ-Form_20210427

SUPPLEMENT-EZ COVER PAGE
NUMBER AND TYPE OF SCMs:
11 System
0
12
tInfiltration
yBloret
13
. .......... ......... ......... ..-.....---
Wet Pond
....,. .. ,. .
1
14
Stormwater Wetland
0
15
Permeable Pavement.......
�..... 0 _--- -
16 _
Sand Filter
..ter
0
Harvesting(RWH)
� 0 m
18
Green Roof
0 .. .....,,
19 ®f��ye!,§preader-Filter
_
Strip (LS FS�
...
0
20..
Disconnected Impervious Surface
_
_.. _..-_ 0 _ ...
21 .
Treatment Swale
0 _
22
Dry Pond ......
.........
....... _.0__„
23
��
StormFilter
.......__ ._ m
0
----- _ _._ . _ _ a. ...... ., ... n .
24
Silva Cell _ �w m ....
�.
0
25
Ba filter
- __ . 0
26
Filterra
0
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.
Qes�er
,fir ��"rFFF
o
Signature of Designer
Z/,1, P-.
Date

DRAINAGE AREAS
__�--__
�p s proje 1 Is this a hi h denct? Yes
3 If so number of drainage areas/SCMs 1
2
Is all/part of this project subject to previous rule
versions? No
rCYVdP�a„ILQ�9d�i�1N�V�
a
DRAINAGE AREA INFORMATION Entire Site
1
�.waaaM
4 Yp of� Wet Pond
u..Wet Pond
., mSCM ....
--Type
5 Total BUA in project (sq q 485392 sf
433196 sfm n
New BUA on subdivided lots (subject to permitting)
6 (sq ft) — _....... ... ... ` ........ .
....... ..... ......
........ .... ... --------
New BUA outside of subdivided lots (subject to
7 pmi,n�) s
8 Offsite -total (sq ft......-.. ._ 2� 9..-0-5-.6_ 2_ sf w......
29:.0562 sf
-a..rea
Offsite BUA (sq
10 Breakdown of new BUA outside subdivided lots:
Parkinq (S9 ft) -----------
Sidewalk_ s ft - 17090 sf
w 15114 sf _ a
: Roof s� ft1 .......: w......:_.n ..�._ ..m m .e.365000 sf
330000 sf......_
Roa _(sq Jift 100062 sf.m
_-w...84842sf ..... .
Future (s9 ft)_
,_....� ..o.. ... ........ ..�...,I
Other, please specify in the comment box
below.. �� 3240 sf .. ..
3240 sf
New infiltrating permeable pavement on
11 subdivided lots�..-
....
New infiltrating permeable pavement outside of
12 subdivided lotssq
Exisitng BUA that will remain (not subject to
13 permitting�(sq ft) - ,
14 Existing BUA that Is already permitted (sq ft)
15 Existincj BUA that will be removed (sic ft)
16 Percent BUA 27.29%
69.62%
17 Desi n storm in ohesj
_, 1.0 in
18 f Deslpn volume of SCM (cu ft)
58614 cf
r__....
..... ,,
19 Calculation method for design volume
1 KKM�UMVY�tlM'�'AmNw �mm �
Simple Method
'
ADM' IkRFtO
Please use this space to provide any additional information about the
20 drarnage area(s)_
Line 10 - There is offsffe BUA draining towards the SCM This includes the residenhal areas end open space along Marcus Place
'Drive and Rockfish Road, apartments along Rockfish Road and a portion of Rockfish Road This offsite BUA will be factored with
100 % Build -Out Potential in the post developed peak now runoff to the SCM The SCM has been ow designed to overcompensate
�Ihe off -site drainage area to balance out the impervious area not directly draining to the SCM by Lots 3842 and Lots 72-73 The
drainage area has decreased and without changing the sae of the SCM now has a design wlume of 58.614 cf The previous
:drainage area yielded a design volume of 66,893 (ddference of 8,279 cf) In addition there is a postal kiosk on site with 3240 sf
rtmpervrous am

WET POND
g
volume o
2 Design ....1 rains o area number
mTTm� ... ..�
�� f SCM (c+a ft)
GENERALr a
to treat the SW from all surfaces at build out?
Is the SCM sized5 aI'are the osi�9..� .�
3�
ed away from contaminated soils?
e slopes of the SCM (I 11f)?
— ........ ._--,.....—........ .....................
Does the SCM have retaining walls, gabion walls or other
6 engineered side slopes?
Are the inlets, outlets, and receiving stream protected _
from erosion
7 (10-year storm)?
..,is there overflow or bypass f„3 nfl--ow "..- vo_-lum-..e ._ in ... e
excess of the -th...
8'design volume?
9 What is the method for dewatering the SCM for maintenance?
._ . -.pp— tP .-.b-. - ...- .-- ucti;_..-
10 If a tiblo wigd .�e SCM Nao cloan�ed overt after oonstructlon?
111 D es the maintenance access comply with General MDC (8)?
12 Does the drainage easement comply with general MDC (9)?
.."' m . If the SWis on -a single family kot, does (will?) the plat comply -wit
13 General MDC (10)?
14 Is there an O&M Agreement that complies with General MDC (11)'
_. — - rea_ .' ...... iron. a m._
15 is there an C)&M Plan that comploos wrGh General MDC
16 Does the SCM follow the device specific MDC?
1 7j Was the SCM designed by an NC licensed ptofessional7
ELE'N µMMIZOR
18 Method used
15�Ka-s a sia gelstorage table provided in the calculatio
Elevation of the excavated main pool depth (bottom dim
g ..
i p p ( ttom of sediment
20 removal) (fmsl)
21 Elevation of the main pool bottom -(top of sediment removal) (fmsl)
Elevation of the bottom of the vegetated shelf (fmsl)
_.._ P.. pool fmsl mrrr...
23 Elevation of the permanent p (fmsl)
Surface area of the main permanent pool (square feet)
Volwtme". ._._ __-_._n _ _.._ _
of the main t�ermar�ent pool fosa6ic feeft
If using equation 3, main pool perimeter (feet)
Nf usieug equation 3 width of submerged veg.
Volume of the forebay (cubic feet) in pooh Is this 1 s-20 oof the volume m the m s
Clean out depth for forebay (inches)
Design volume of SCM (ou ft) —
Is the outlet an orifice or a weir?
II 67if'ico, caoofare dtaiiueter (inches) -
- - —
If weir, weir height (inches)
if wear., weir length (inches)
a manner
41 circuiting?
42 Are berms or baffles provided to tmprov_ the flow path e
43 Depth of forebay at entrance (Inches)
44 Depth.of., _forebaytray at exit (inches) -- .... ...
.... _ .........
45 D.
_ oes water flow out of the forebay in a non --erosive manner?
46 Wid ' the vegetated -shelf (feet)
48 permanent pool?
Does the pond minimize impacts to the receiving channel from the
49 yr, 24-hr storm?
Are fountains proposed? (If Y, please provide documentation that
50 MDC(9) is met.)
51 Is a trash rack or other device provided to protect the outlet system'
52 Are the dam and embankment planted in non -clumping turf grass?
53. SeEIe-i-of turf th-it will be used on the danii i-nd embankment
5' '-H5s -�FpTi6tr6-g-"oien been proved for e, veg—o t-ea sik76t
ADDITIONAL INFORMATION
P p P y...., _.. about
lease use this space to rovtde an additional in—formationmm.
55 the wet ands :
Responses to Lines 34, 43 & 44 are for East Forebay.
'West Forebay: Line 34 = 72 in, Line 43 = 84 in, Line 44 = 36 in
'See Drainage Area additional information for clarification on oversizing of
'SCM.
Yes
Yes LL
Yes
Yes""
SA/DA
Yes
174.5
175.5
...184.5
�185.0 ..
_ ..._....187.3
m p 15710.0y+
101359-cf
7.07 ft
Equations
486.0 ft
_ 30ft
15496 cf
60 inm
58614 cf
Onfice
3.50 in
2.14
Yes
Yes
72.0 in
Yes
Yes
No
Yes
Yes
Hybrid Bermuda
Wet Pond 1 3:19 PM 4/26/2021