SW4240703_Supplement-EZ Form_20240730

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name Cane Creek Subdivision Phase 8
2 Project Area(ac) 44.31
3 Coastal Wetland Area(ac) N/A
4 Surface Water Area(ac) 1.05
5 Is this project High or Low Density? Low
6 Does this project use an off-site SCM? No
COMPLIANCE WITH 02H.1003(4)
7 Width of vegetated setbacks provided(feet) N/A
8 Will the vegetated setback remain vegetated? N/A
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 0
12 Bioretention Cell 0
13 Wet Pond 0
14 Stormwater Wetland 0
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 3
23 StormFilter 0
24 Silva Cell 0
25 Bayfilter 0
26 Filterra 0
FORMS LOADED
DESIGNER CERTIFICATION 27 Name and Title: Douglas Cooper PE,PLS
28 Organization: Bateman Civil Survey Company
29 Street address: 2524 Reliance Ave
30 City,State,Zip: Apex,NC 27539
31 Phone number(s): (919)577-10810
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
Digitally signed by
\\\. iCAR // Douglas B Cooper
` r� • • • • • • Date: 2024.06.19
O • c/ :I, 10:51:45-04'00'
S y l _ Signature of Designer
,: 3i548
0�W/4924 10:49;• 41J
i,� , ��/G}hiS*Q; �-
ii7//CIS�Bi i C(3,,,N, 06/19/2024
Seal Date

DRAINAGE AREAS
1 Is this a high density project? No
2 If so,number of drainage areas/SCMs _ N/a
3 Does this project have low density areas? _ Yes
4 If so,number of low density drainage areas _ 1
Is all/part of this project subject to previous rule
5 versions? No
CLICK TO LOAD FORM
DRAINAGE AREA INFORMATION Entire Site LD 1
4 Type of SCM N/A N/A
5 Total drainage area(sq ft) 1975543 _ 1975543
6 Onsite drainage area(sq ft) 1975543 _ 1975543
7 Offsite drainage area(sq ft) 0 0
8 Total BUA in project(sq ft) 236907 sf _ 236907 sf
New BUA on subdivided lots(subject to
9 permitting)(sq ft) 139536 sf 139536 sf
New BUA not on subdivided lots(subject to
10 permitting)(sf) 94179 sf 94179 sf
11 Offsite BUA(sq ft) sf sf
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) sf sf
-Sidewalk(sq ft) sf sf
-Roof(sq ft) sf sf
-Roadway(sq ft) 94179 sf 94179 sf
-Future(sq ft) sf sf
-Other,please specify in the comment box
below(sq ft) n/a n/a
New infiltrating permeable pavement on
13 subdivided lots(sq ft) n/a n/a
New infiltrating permeable pavement not on
14 subdivided lots(sq ft) n/a n/a
Existing BUA that will remain(not subject to
15 permitting)(sq ft) 3196 sf 3196 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 12% 12%
19 Design storm(inches) n/a n/a
20 Design volume of SCM(cu ft) n/a n/a
21 Calculation method for design volume n/a n/a
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
ALL DRAINAGE GOES TO(1)ANALYSIS POINT.THE CORRECT BUA
PERCENT IS 11.53%,HOWEVER LINE 18 IS AUTOFILLING TO THE
ROUNDED 12.

LOW DENSITY
DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H.1003(11
1 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) (3:1)
5 Maximum velocity in the vegetated conveyances during the 10-year storm? 13.51
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)
9 Maximum side slope of curb outlet swale(s)(H:V)
10 Minimum length of curb outlet swale(s)(feet) _
11 Are treatment swales used instead of curb outlet swales?
12 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
ADDITIONAL INFORMATION _
15 Please use this space to provide any additional information about this low density project:
Drainage Pervious
Swale BUA Q Slope Vano. Vanoai Flow depth
Area area C
# (ac) (cfs) (%) (fps) (fps) (ft)
(ac) (ac)
1 3.30 0.53 2.77 0.50 2.23 4.65 3.62 3.62 0.25
2 0.61 0.17 0.44 0.50 0.42 4.29 2.41 2.41 0.08
3 4.75 0.82 3.93 0.50 3.23 4.98 3.94 3.94 0.29
4 0.88 0.10 0.78 0.50 0.59 4.78 2.22 2.22 0.12
5 0.76 0.16 0.60 0.50 0.51 5.88 2.29 2.29 0.08
6 0.28 0.06 0.22 0.50 0.19 1.00 0.99 0.99 0.09
7 3.39 0.53 2.86 0.50 2.44 5.50 4.38 4.38 0.50
8 0.93 0.53 0.40 0.50 1.36 4.79 3.00 3.00 0.17
9 0.50 0.23 0.27 0.50 0.35 3.51 2.32 2.32 0.08
10 1.10 0.33 0.77 0.50 0.76 4.27 2.61 2.61 0.17
11 0.34 0.11 0.23 0.50 0.23 5.78 1.97 1.97 0.08
12 0.36 0.12 0.24 0.50 0.32 5.67 1.97 1.97 0.08
13 0.34 0.11 0.23 0.50 0.23 1.91 1.23 1.23 0.08
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DRY POND
1 Drainage area number SCM-1 I SCM-2 I SCM-3
2 Minimum required treatment volume(Cu ft) 3973 cf 10141 cf 4961 cf
GENERAL MDC FROM 02H.1050
3 Is the SCM sized to treat the SW from all surfaces at build-out? Yes Yes Yes
4 Is the SCM located away from contaminated soils? Yes Yes Yes
5 What are the side slopes of the SCM(H:V)? 3:1 3:1 3:1
6 Does the SCM have retaining walls,gabion walls or other No No No
engineered side slopes?
7 Are the inlets,outlets,and receiving stream protected from erosion Yes Yes Yes
(10-year storm)?
8 Is there an overflow or bypass for inflow volume in excess of the Yes Yes Yes
design volume? _
- 9 What is the method for dewatering the SCM for maintenance? Drawdown Orifice Drawdown Orifice Drawdown Orifice
10 If applicable,will the SCM be cleaned out after construction? Yes Yes Yes
11 Does the maintenance access comply with General MDC(8)? _ Yes Yes Yes
12 Does the drainage easement comply with General MDC(9)? Yes Yes Yes
13 If the SCM is on a single family lot,does(will?)the plat comply with N/A N/A N/A
General MDC(10)?
14 Is there an O&M Agreement that complies with General MDC(11)? Yes Yes Yes
15 Is there an O&M Plan that complies with General MDC(12)? _ Yes Yes Yes
16 Does the SCM follow the device specific MDC? _ Yes Yes Yes
17 Was the SCM designed by an NC licensed professional? Yes Yes Yes
DRY POND MDC FROM 02H.1062
18 SHWT elevation(fmsl)
- 19 Elevation of the bottom of the dry pond(fmsl) 450 472 478
20 Distance from bottom to SHWT(feet)
21 Elevation of the temporary pool during the design storm(feet) 456 ft 476 ft 482 ft
22 Ponding depth of the design storm(feet) 6 ft 4 ft 4 ft
23 Will the dry pond be uniformly graded to flow toward the outlet? Yes Yes Yes
24 Is a low flow channel being provided? _ No _ No No
25 Are the inlet(s)and outlet located in a manner that avoids short- Yes Yes Yes
circuiting?
26 Will berms or baffles be provided to increase the flow path? No Yes No
27 What method of pretreatment will be provided? Forebay Forebay Forebay
28 Design volume of SCM(Cu ft) 19656 41630 17127
29 Diameter of drawdown orifice(in) 1 in 2 in 1 in
30 Drawdown time for the temporary pool(hours) 12.72 12.48 16.8
31 Does the pond minimize impacts to the receiving channel from the 1- Yes Yes Yes
yr,24-hr storm?
32 Is there a small permanent pool near the orifice to prevent clogging? Yes Yes Yes
33 Will the outlet be designed to prevent clogging? Yes Yes Yes
34 Are the dam and embankment planted in non-clumping turf grass? Yes Yes Yes
- 35 Species of turf that will be used on the dam and embankment Hybrid Bermuda Hybrid Bermuda Hybrid Bermuda_
36 Will trees and shrubs be prevented from growing on the dam and Yes Yes Yes
embankment?
ADDITIONAL INFORMATION i i
37
Please use this space to provide any additional information about the
dry pond(s):
2