SW6240804_Supplement-EZ Form_20241015

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION . _ .,. _,_: _ .,_. ..._ - _,.._.,.,., ,.,.,.._,..��..�.,...,,._,_,_,.... ....�.,..,.__..,,..--
1 Project Name Drake Landing Subdivision
.
2 ;Project Area(ac) 55.6
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 0
5 Is this project High or Low Density? Both High and Low Density
6 Does this project use an off site SCM? No
COMPLIANCE WITH 02H.1003(4)
7 Width of vegetated setbacks provided(feet) 50 (
8 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
,�..:.,._.._-.W.-...._,W.-..�,.......a.,ow__,.__-...m.._..._�.,....__m,.w..�........_._e..�..,�...,.m_,_..-_..w.s.._.-,..-..�... .,-....,_�,,.-__m.�M__,_...__.....�...w._.,._.....m..._,�..,.....�.___._.w._._.J
NUMBER AND TYPE CF SCMs
11 Infiltration System I
12 tBioretention Cell
13 Wet Pond 1
14 Stormwater Wetland I
"s
15 ;Permeable Pavement j
16 Sand Filter j
17 Rainwater Hary sting(RWH) _
18 Green Roof
19 ,Level Spreader-Filter Strip(LS-FS) {1
20 j Disconnected Impervious Surface(DIS)
I
21 Treatment Swale
22 Dry Pond
23 StormFdter
24 ',Silva Cell
25 Bayfilter
26 Filterra �.-...a.__ .__.-_ ....-w___.._W.,_r.. _.�__I
FORMS LOADED
DESIGNER CERTIFICATION I
27 :Name and Title: C. Scott Brown, PE
28 'Organization 4D Site Solutions, Inc.
29 :Street address: 409 Chicago Drive-Suite 112 a
30 City,State,Zip: Fayetteville, NC 28306
31 Phone number(s): 910-426-6777
32 Email: sbrown©4dsitesolutionscom
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.
Designer
\\ ,i,,,,,,,,,,
,`�\A CAROB''/,
...A, ..o..c:• c i ,,Alf,:z_•10•.. ,v .i,..
-r s)
Sr,-.:Al.? = Signature of Designer
027452 =
0 •••F"v•GINc(-e' \J4
',SCOTT 0 os °Y"
,24 Z8-at
Seal 61, Date

DRAINAGE AREAS
,-, Tis this ahigh density project? Yes
---.-- ,
2 If so, number of drainage areas/SCMs
3 I Does this project have low density areas? Yes
If so,number of low density drainage areas
Is all/part of this project subject to previous rule 1
1
L 5yersions? No
FORMS LOADED
!DRAINAGE AREAINFORMATION-----
T—TillWgre—rmi
77717-peo7Fai-- -'-"- -----T-------irrie i;0nd— Cow5ensity ' 1
5 Total drainage area(sq ft) 1 2„421,723 1,865,654 702 971
• 6 Onsite drainage area(sq ft)
7 ,i0ffsite drainege area(sq ft)
' 2 421 723 1,718,752
146 962 146,902 t.
702 971
•
.. _
' 8 riotal BUA in project(sq ft) " 950426 sf 948610 sf 148718 sf
,
New BUA on subdivided lots(subject to q
# 9 Ipermitting)(sq,ft), L . 60'2144 sf i 505750 sf 96394 sf
I New BUA not on subdivided lots(subject to 1 .i
4 o t i k
10 Ipermittin (sf) 1 348261 sf 295958 sf i 52303 sf
'11 I Offsite BUA(sq ft)
'--- t-
?
4,-
; 1 146902 sf 1
#12 Breakdown of new BUA not on subdivided lots: 1 1 I t
k
i o
1 -Parking(sq ft)
E'
1
1 I -Sidewalk(sq ft), , 43934 sf 1 37093 sf 6841 sf
Roof(sq ft)_
/
" -
Roadway IN ftl ? 258663 sf i 213201 sf i 45462 sf i
I ' -Future(sq ft)
-Other, please specify in the comment box
belowlsgftl / 45664 sf 45664 sf
New infiltrating permeable pavement on i
ii
13 isubdividecl lots(sq ft) t
I New infiltrating permeable pavement not on g
14 'subdivided lots(sq ft) I
t .
'Existing BUA that will remain(not subject to
4"
N .
t
-
1 21 sf t
1,5_4perrppng)(sqft) -A
16 ;Existing BUA that is already permitted(sq ft)
17 ;Existing BOA that willbe removed(sq_ft)
id1i;ercent bii, 1 II 51%
19 Design storm(inches)
20 tpeig.r,volume of SCM(cu ft) q 39%
.0 in
- 78919 cf 21°).
I 21 iCalculation method for delgiv21= _i_____- Simple
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 Idrainage area(s): A
"Other"BUA not on subdivided lots accounts for permanent pool area of 1
wet pond t
t
1 #

WET POND
14Drainage area number 1
2'.Minimum re uired treatment volume cu ft 78919 cf
GENERAL MDC FROM 02H.1050
3!,Is the SCM sized to treat the SW from all surfaces at build-out? Yes
4 i Is the SCM located away from contaminated soils? Yes
5;What are the side slopes of the SCM(H:V)? 3:1
I.
DoesT the SCM have retaining walls,gabion walls or other engineered ,
8';side slopes? No
7 iAre the inlets,outlets,and receiving stream protected from erosion • Yes
) (10 Year storm)?_
I ;Is there an overflow or bypass for inflow volume in excess of the
'"'design volume? Yes
91What is the method for dewatering the SCM for maintenance? Pump(preferred)
1 10 If applicable,will the SCM be cleaned out after construction? Yes
. 11(Does the maintenance access comply with General MDC(8)? Yes a
Does the drainage easement comply with General MDC(9)? Yes
13'If the SCM is on a single family lot,does(will?)the plat comply with N/A ,,i'
General MDC(10)?
14!Is there an O&M Agreement that complies with General MDC(11)? Yes
15 Is there an O&M Plan that complies with General MDC(12)? Yes
16,Does the SCM follow the device specific MDC? Yes
17',Was the SCM designed bean NC license rafessrona? Yes
..-,.., ,:. w„Win. rK
'WET POND MDC FROM 02H.1053
� 18Sizin�method used ' .SR/DA
19 Has a stage/storage table been provided in the calculations? Yes
i 20 J Elevation of the excavated main pool depth(bottom of sediment 247.50
;removal)(fmsl)
} 21 Elevation of the main pool bottom(top of sediment removal)(fmsl) 248.50 1
a
` 22 Elevation of the bottom of the vegetated shelf(fmsl) 251,50 1
23 Elevation of the permanent pool(fmsl) 252.00 4
1 24 Elevation of the top of the vegetated shelf(fmsl) 252.50
I 25,Elevation of the temporary pool(fmsl) 254.25
I 26,Surface area of the main permanent pool(square feet) 37550
) 27 Volume of the main permanent pool(cubic feet) 117152 cf
i 28 Average depth of the main pool(feet) 3.10 ft
29 Average depth equation used Equation 2
l 30 If using equation 3,main pool perimeter(feet)
, 31 I If using equation 3,width of submerged veg.shelf(feet)
32,Volume of the forebay(cubic feet) 20617 cf
33.Is this 15-20%of the volume in the main pool? Yes
34 Clean out depth for forebay(inches) 42 in
35 Design volume of SCM(cu ft) 114538 cf
36,1s the outlet an orifice or a weir? Orifice
37I! If orifice,orifice diameter(inches) 5 in
381 If weir,weir height(inches) t
4
d 39r
If weir,weir length(inches) I
40;Drawdown time for the temporary pool(days) 2.3
41 Are the inlet(s)and outlet located in a manner that avoids short- Yes
circuiting?
, 42 Are berms or baffles provided to improve the flow path? I No
( 43:Depth of forebay at entrance(inches) 54 in
44Depth of forebay at exit(inches) 48 in
45'Does water flow out of the forebay in a non-erosive manner? Yes
46 Width of the vegetated shelf(feet) 6 ft
i, 47 Slope of vegetated shelf(RV) 6:1
1. Does the orifice drawdown from below the top surface of the l
€ 48 Yes
l ;permanent pool?
Does the pond minimize impacts to the receiving channel from the 1- ' Yes
vr,24-hr storm?
l50i Are fountains proposed?(If Y,please provide documentation that No
MDC(9)is met.)
,
51
Is a trash rack or other device provided to protect the outlet system? Yes
52:Are the dam and embankment planted in non-clumping turf grass? Yes
i
1 53,Species of turf that will be used on the dam and embankment Bermuda Grass
54 Hasa lantin Ian been rovided for the ve stated shelf? Yes
ADDITIONAL INFORMATION
Please use this space to pr ovide ideany additional information about the .155!!:wet pond(s): }
1
1 1
Wet Pond 1 5:36 PM 8/28/2024

LOW DENSITY
DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H.1003
1 s 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 sf
5 Maximum velocity in the vegetated conveyances during the 10-year storm? 2
6 Are curb outlet swales proposed? Yes
7 ; Maximum longitudinal slope of curb outlet swale(s)(%) 5%
8 Bottom width of curb outlet swale(s)(feet) 2 ft
.
9 Maximum side slope of curb outlet swale(s)(H:V) 3:1
10 Minimum length of curb outlet swale(s)(feet) 100 ft
11 Are treatment swales used instead of curb outlet swales? No
12 I 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 ,Are variations to rule.1003 proposed? No
w
ADDITIONAL INFORMATION
15 :Please use this space to provide any additional information about this low density project:
1
Swale Drainage BUA Pervious •
Q Slope VA.. V,a,, j Flow depth
# Area (ac) area c (cfs) (%) (fps) (fps) (ft)
last tact i
1 0.26 0.02 0.24 0.25 0.50 1.00 2.00 0.76 0.33
2 1.00 0.53 0.47 0.60 4.73 0.50 2.00 1.11 0.90
3 0.64 0.30 0.34 0.55 2.77 1.00 4.50 1.40 0.66
4 0.52 0.24 0.28 0.55 2.25 1.00 4.50 1.30 0.61
6 0.69 0.41 0.28 0.65 3.53 1.00 2.00 1.49 0.62
8
I
9
10
. .
11 _ r
12
13
14
15
18
17
18
19
20.. ,_ s
21
22 f
23
24
25 i
26
27
28 r ,
29..... ,
30