SW4231201_Supplement-EZ Form_20231207

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 ,Project Name Fiddlers Creek Farms
2 Project Area ac_ 43.3 _
©Coastal Wetland Area ac N/A _
4 Surface Water Area ac _ N/A
©Is this .roject High or Low Density? High
6 (Does this project use an off-site SCM? No
COMPLIANCE WITH 02H.1003(4)
7 Width of vegetated setbacks provided(feet) 30 _
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)? Yes
10 Is streambank stabilization proposed on this project? No
NUMBER AND TYPE OF SCMs:
11 Infiltration System ___0
12 Bioretention Cell _ 0
13 Wet Pond _ 2
14 Stomiwater Wetland 1
15 Permeable Pavement _ 0
16 Sand Filter 0 _
17 Rainwater Harvesting(RWH) 0
18 Green Roof 0
19 Level Spreader-Filter Strip(LS-FS) _ _ - 0
20 Disconnected Impervious Surface(DIS) 0
21 Treatment Swale 0
22 Dry Pond — 0
23 StormFilter _ 0
24 Silva Cell 0
25 Bayfilter --_-- 0
26 Filterra 0
FORMS LOADED
DESIGNER CERTIFICATION
27 ;Name and Title: Jeremy Keeny Vice President PE,PLS
28 Organization: Moms&Ritchie Associates
29 Street address: 530 Hinton Pond Road
30 City,State,Zip: Knightdale,NC 27545
31 Phone number(s): 984-200-2103
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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Seal Date

DRAINAGE AREAS
1 Is this a high density project? Yes
2 If so,number of drainage areas/SCMs 3 __ -
3 Does this project have low density areas? _ No _
4 If so,number of low density drainage areas 0__
Is all/part of this project subject to previous rule
5 versions? No
FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site 1 2 i 3
_ C Stormwater
4 Type of SCM Wet Pond Wet Pond _ Wetland
5 Total drainage area(sq ft) 1021482 380278.8 - 420789.6 220413.6 _
6 Onsite drainage area(sq ft) 1021482 380278.8 420789.6 220413.6 _
7 Offsite drainage area(sq ft) 0 0 0 _ __ 0 _
8 Total BUA in project js_g ft) - 458376 sf 174330 sf 179686 sf 104360 sf __
New BUA on subdivided lots(subject to permitting)
9 (sq ft) _ 273442 sf 90500 sf_ 112995 sf 69947 sf_
New BUA not on subdivided lots(subject to
10 permitting)(sf) __184934 sf 83830 sf 66691sf 34413 sf
11 Offsite BUA(sq ft) _ sf sf sf sf
12 Breakdown of new BUA not on subdivided lots: _
-Parking(sq ft) sf sf sf sf
-Sidewalk(sq ft) 41844 sf 18949 sf 15072 sf 7623 sf
-Roof(sq ft) sf sf sf _ sf
-Roadway(sq ft) 138740 sf_ 60331 sf 51619 sf 26790 sf
-Future(sq ft) sf sf sf sf
-Other,please specify in the comment box
below(sq ft) sf
New infiltrating permeable pavement on
13 subdivided lots(sq ft) N/A N/A N/A N/A _
New infiltrating permeable pavement not on
14 subdivided lots(sq ft) N/A N/A N/A N/A
Existing BUA that will remain(not subject to
15 permitting)(sq ft) N/A _ N/A N/A N/A
16 Existing BUA that is already permitted(sq ft) N/A N/A N/A N/A
17 Existing BUA that will be removed(sq ft) N/A N/A N/A N/A
18 Percent BUA _ 24% 56% 42% 52%
19 Design storm(inches) 1.0 in 1.0 in 1.0 in 1.0 in
20 Design volume of SCM(cu ft) 50192 cf 19785 cf 20670 cf 9737 cf
,; 21 Calculation method for design volume Simple Method Simple Method Simple Method Simple Method
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):

WET POND
1 l Drainage area number I 1 (SCM A) 2(SCM 81 i
2{Minimum required treatment volume(cu ft) 17505 cf 18528 cf
GENERAL MDC FROM 02H.1050
3 Is the SCM sized to treat the SW from all surfaces at build-out? ( _ Yes Yes
4 Is the SCM located away from contaminated soils? F Yes Yes
5 What are the side slopes of the SCM(H:V)? _ 3:1 _ 3:1
6 Does the SCM have retaining walls,gabion walls or other engineered No No
side slopes?
Are the inlets,outlets,and receiving stream protected from erosion
7(10-year storm)? Yes Yes
8 Is there an overflow or bypass for inflow volume in excess of the Yes Yes
design volume? I
9 What is the method for dewatering the SCM for maintenance? Pump(preferred) Pump(preferred)
10 If applicable,will the SCM be cleaned out after construction? Yes Yes
11 Does the maintenance access comply with General MDC(8)? Yes Yes
12 Does the drainage easement comply with General MDC(9)? _ Yes _ Yes
13 If the SCM is on a single family lot,does(will?)the plat comply with N/A N/A
General MDC(10)?
14 Is there an O&M Agreement that complies with General MDC(11)? Yes Yes
15 Is there an O&M Plan that complies with General MDC(12)? Yes Yes
16 Does the SCM follow the device specific MDC? _ Yes - Yes_
17 Was the SCM designed by an NC licensed professional? Yes Yes
WET POND MDC FROM 02H.1053
18 Sizing method used SA/DA _ SA/DA
19 Has a stage/storage table been provided in the calculations? Yes Yes
20 Elevation of the excavated main pool depth(bottom of sediment 803.00 797.00
removal)(fmsl) -
21 Elevation of the main pool bottom(top of sediment removal)(fmsl) 803.50 797.50
22 Elevation of the bottom of the vegetated shelf(fmsi) 807.00 801.00
23 Elevation of the permanent pool(fmsl) 807.50 801.50
24 Elevation of the top of the vegetated shelf(fmsl) 808.00 802.00
25 Elevation of the temporary pool(fmsi) 807.50 801.50
26 Surface area of the main permanent pool(square feet) 12817 13080
27 Volume of the main permanent pool(cubic feet) 40279 cf 41728 cf
28 Average depth of the main pool(feetL 3.14 ft 3.19 ft
29 Average depth equation used Equation 2 Equation 2
30 If using equation 3,main pool perimeter(feet) N/A N/A _
31 If using equation 3,width of submerged veg.shelf(feet) N/A N/A
32 Volume of the forebay(cubic feet) 7336 cf 8327 cf
33 Is this 15-20%of the volume in the main pool? Yes _ Yes
34 Clean-out depth for forebay(inches) 6 in _ 6 in
35 Design volume of SCM(cu ft) 19785 cf 20670 cf
36 Is the outlet an orifice or a weir? _ Orifice Orifice
37 If orifice,orifice diameter(inches) -_ 2 in _ 2 in
38 If weir,weir height(inches) -- N/A _ N/A
39 If weir,weir length(inches) N/A N/A
40 Drawdown time for the temporaryppol(days) I - 3.6 3.8
Are the inlet(s)and outlet located in a manner that avoids short-
41 circuiting? Yes Yes
42 Are berms or baffles provided to improve the flow path? Yes s Yes
43 Depth of forebay at entrance(inches) 6 in 6 in _
44 Depth of forebay at exit(inches) _ 6 in _ 6 in
45 Does water flow out of the forebay in a non-erosive manner? Yes __ Yes
46 Width of the vegetated shelf(feet) 6 ft 6 ft
47 Slope of vegetated shelf(H:V) 6:1 6:1
Does the orifice drawdown from below the top surface of the
48 No
permanent pool? No
49 Does the pond minimize impacts to the receiving channel from the 1- Yes Yes
yr,24-hr storm?
50 Are fountains proposed?(If Y,please provide documentation thatNo No
MDC(9)is met.)
51 Is a trash rack or other device provided to protect the outlet system? Yes Yes
52 Are the dam and embankment planted in non-clumping turf grass? Yes Yes
53,Species of turf that will be used on the dam and embankment N/A N/A
_ 54 Has a planting plan been provided for the vegetated shelf? Yes Yes
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
55 i wet pond(s):
Wet Pond 3 1:20 PM 11/29/2023

STORMWATER WETLAND
1 Drainage area number 3(SCM C)
2 Minimum required treatment volume(Cu ft) 8754 of
GENERAL MDC FROM 02H.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
®What are the side slopes of the SCM(H:V)? 3:1 _
ICDoes the SCM have retaining walls,gabion walls or other engineered Yes
side sl.. .?
EAre the inlets,outlets,and receiving stream protected from erosion(1.
Year storm)? Yes
IIs there an overflow or bypass for inflow volume in excess of the Yes
design volume? _
What is the method for dewaterine the SCM for maintenance? Furry(profertd�
•If a.•licable,will the SCM be cleaned out after construction? _ -Yes
Does the maintenance access comply with General MDC(8)? Yes
®Does the drainage easement comply with General MDC(9)? Yesle
If the SCM is on a single family lot,does(will?)the plat comply with
No
General MDC(j)?
EIs 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 by an NC licensed professional? Yea
STORMWATER WETLAND MDC FROM 02H.1054
18'Design volume of SCM(cu ft) 9737
19 Are the inlet(s)and outlet located In a manner that avoids short- Yes
circuiting?
20 Are berms or baffles provided to improve the flow path? Yes
21 Does the orifice drawdown from below the top surface of the
No
permanent pool?
22 Does the wetland minimize impacts to the receiving channel from the 1- Yes
yr,24-hr storm?
23 Is a trash rack or other device provided to protect the outlet system? Yes
Etevet ens
24 Elevation,peak attenuation above temporary pool(if applicable)(fmsl)
25 Elevation,temporary pool(top of the temporary inundation zone)(fmsl) 811.00
26 Elevation,permanent pool(top of the shallow water zone)(fmsl) 811.00
27 Elevation,bottom of shallow water zone(fmsl) 809.75 _
28 Elevation,bottom of forebay deep pool at deepest point(at forebay 808.00
entrance)_(fmsl)
29 Elevation,bottom of forebay deep pool at shallowest point(at forebay 808.00
exit)(fmsl) __
30 Elevation,bottom of non-forebay deep pool at deepest point(fmsl) 808.25
Honda,lens
31 Area,total surface area of the SW wetland at temporary pool elev.(sq 9,027.00
ft)
32 Area,temporary inundation zone at temporary pool elev.(sq ft) 3,518.00
33 Area,shallow water zone at temporary pool elev.(sq ft) 3,419.00
34 Area,forebay at temporary pool elev.(sq ft) 1,298.00
35 Area,non-forebay deep pool at temporary pool elev.(sq ft) 792.00
36 Percent area provided,temporary inundation zone(should be 30-45%) 39%
37 Percent area provided,shallow water zone(should be 35-45%) 38%
38 Percent area provided,deep pool(forebay)(should be 10-15%) 14%
39 Percent area provided,deep pool(non-forebay)(should be 5-15%) I 9%
Depths and Outlet
40 Peak attenuation depth above temporary inundation zone(inches) 14 in
ElTemporary Inundation zone depth(temporary pool to permanent pool) 15 in
inches -- --
EShallow water zone depth(permanent pool to bottom of wetland) gin
inches)
ElDepth,forebay at entrance(permanent pool to bottom of forebay
entrance inches 24 In
Depth,forebay at exit(permanent pool to bottom of forebay exit) 9
El inches in
ElDepth,non-forebay deep pools(permanent pool to deep pool bottom) 18 in
Inches _
46 If there Is an orifice,diameter inches 1 in
-If there is a weir,weir height(Indies) - NM
48 If there is a weir,weir length(inches) N/a
49 Drawdown time for the temporary pool(days) 4.3
Wetland 4 1:20 PM 11/29/2023