SW6231103_Supplement-EZ Form_20231121

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION -
1 Project Name Godwin Subdivision
2 Project Area(ac) 31.53
3 Coastal Wetland Area(ac) - 0
4 Surface Water Area(ac) 0 _
5 Is this project High or Low Density? _ High
6 !Does this project use an off-site SCM? No
COMPLIANCE WITH 02H.1003(4).
7 1 Width of vegetated setbacks provided(feet) N/A
8 Will the vegetated setback remain vegetated? N/A
9 If BUA is proposed in the setback1 does it meet NCAC 02H.1003(4)(G-d)? N/A
10 Is streambank stabilization proposed on this project? No
NUMBER AND TYPE OF SCMs:
11 Infiltration System
12 Bioretention Cell _
13 Wet Pond 1
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
22 Dry Pond
23 StormFilter
24 4 Silva Cell
25 Bayfilter
26 Filterra
FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title: Donald L.Curry.Jr..PE/Project Manager
28 Organization: Curry Engineering
29 Street address: 205 S.Fuquay Ave.
30 !City,State,Zip: Fuquay-Varina,NC 27526
31 Phone number(s): 919-552-0849
32 !Email: [e-mail]
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
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4 .4 <•".'•! Signature of Designer
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Seal Date

DRAINAGE AREAS
1 Is this a high density project? Yes
2 If so,number of drainage areas/SCMs 1
3 !Does this project have low density areas? No
4 f If so,number of low density drainage areas I 0
Is all/part of this project subject to previous rule
5 versions? No
FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site 1
4 IType of SCM Wet Pond Wet Pond
_ 5 !Total drainage area(sq ft) 1094463 1094463
6 Onsite drainage area(sq ft) 1094463 1094463
7 Offsite drainage area(sq ft) 0 0
8 Total BUA in project(sq ft) 494408 sf 494408 sf
I New BUA on subdivided lots(subject to permitting)
9 (sq ft) 348046 sf 348046 sf
New BUA not on subdivided lots(subject to
10 permitting)(sf) sf sf
11 Offsite BUA(sq ft) sf sf
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) 5804 sf 5804 sf
-Sidewalk(sq ft) 436 sf 436 sf
-Roof(sq ft) 345726 sf 345726 sf
-Roadway(sq ft) 142442 sf 142442 sf
-Future(sq ft) sf sf
-Other,please specify in the comment box
below(sq ft) sf sf
New infiltrating permeable pavement on
13 subdivided lots(sq ft) sf sf
New infiltrating permeable pavement not on
14 subdivided lots(sq ft) sf sf
Existing BUA that will remain(not subject to
15 ,permitting)(sq ft) sf sf
16 Existing BUA that is already permitted(sq ft) sf sf
17 Existing BUA that will be removed(sq ft) sf sf
18 :Percent BUA 45% 45%
19 Design storm(inches) _ 1.0 in 1.0 in
20 Design volume of SCM(cu ft) 41628 cf 41628 cf
21 'Calculation method for design volume Simple Simple
ADDITIONAL INFORMATION i_ _ •
Please use this space to provide any additional information about the
22 drainage area(s):

WET POND
1 Drainage area number _ 1
2 Minimum required treatment volume(cu ft) 41628 cf
GENERAL MDC FROM 02N.1050
3 Is the SCM sized to treat the SW from all surfaces at build-out? Yes
4 Is the SCM located away from contaminated soils? Yes
5 What are the side slopes of the SCM(H:V)? 3:1
6 Does the SCM have retaining walls,gabion walls or other engineered No
side slopes?
Are the inlets,outlets,and receiving stream protected from erosion
7 Yes
1(10-year storm)?
Is there an overflow or bypass for inflow volume in excess of the
8 design volume? Yes
91 What is the method for dewatering the SCM for maintenance? Pump(preferred)
10 If applicable,will the SCM be cleaned out after construction? Yes
11 Does the maintenance access comply with General MDC(8)? Yes
12 Does the drainage easement comply with General MDC(9)? Yes
3 If the SCM is on a single family lot,does(will?)the plat comply with No
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)? I Yes
16 Does the SCM follow the device specific MDC? _ Yes
17 Was the SCM designed by an NC licensed professional? Yes
WET POND Mk1CFROM 02H.10Sa _
18ISIzing method used SAIDA
19 Has a stage/storage table been provided in the calculations? Yes
Elevation of the excavated main pool depth(bottom of sediment
20 removal)(fmsl) i 132.50
21 Elevation of the main pool bottom(top of sediment removal)(fmsl) 133.50
22 Elevation of the bottom of the vegetated shelf(fmsl) 137.50
23 Elevation of the permanent pool(fmsl) 138.00
24 Elevation of the top of the vegetated shelf(fmsl) 138.50
25'Elevation of the temporary pool(fmsl) 139.30
26 Surface area of the main permanent pool(square feet 25639
27I Volume of the main permanent pool(cubic feet) 113076 cf
28 Average depth of the main pool(feet) 4.94 ft
29 Average depth equation used Equation 3
30, If using equation 3,main pool perimeter(feet) 699.0 ft
31' If using equation 3,width of submerged veg.shelf(feet) j 3.0 ft
321Volume of the forebay(cubic feet) 6286 cf _
33,Is this 15-20%of the volume in the main pool? Yes
341 Clean-out depth for forebay(inches) 12 in
351Design volume of SCM(cu ft) 46094 cf
36 Is the outlet an orifice or a weir? Orifice
37 If orifice,orifice diameter(inches) i 3 in _
38 If weir,weir height(inches) in
39 If weir,weir length(inches) in
401 Drawdown time for the temporary pool(days) 3.43
Are the inlet(s)and outlet located in a manner that avoids short-
41 circuiting? Yes
42 Are berms or baffles provided to improve the flow path? No
43 Depth of forebay at entrance(inches) 30 in _
44 Depth of forebay at exit(inches) _ 36 in
45)Does water flow out of the forebay in a non-erosive manner? Yes
46 Width of the vegetated shelf(feet) 6 ft
47 Slope of vegetated shelf(H:V) 6:1
Does the orifice drawdown from below the top surface of the
48 permanent pool? Yes
'Does the pond minimize impacts to the receiving channel from the 1-
4 Yes
9
yr,24-hr storm?
50 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
53 Species of turf that will be used on the dam and embankment Fescue or
Centipede
54'Has a planting plan been provided for the vegetated shelf? Yes
ADDITIONAL INFORMATION
55 Please use this space to provide any additional information about the
wet pond(s):
Wet Pond 1 11:08 AM 11/2/2023