HomeMy WebLinkAboutSW4220901_Supplement-EZ Form_20220921SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
COMPLIANCE WITH 02H .1003(4)
7 Width of vegetated setbacks provided (feet} n/a
....._
8 jWII the vegetated setback remain vegetated? nla
g T1f BUA is proposed in the setback, does it meet NC_A_C 02H. 1003 (4)(c-d)? n/a
10 Isstreambank stabilization proposed on this project? I n/a
FORMSLOADED
DESIGNER CERTIFICATION
27 Name and Title:
28 ;Organization:
29 :Street address:
Phone
Email:
Steve Causey, PF
Allied Design, INCH
4720 Kester Mill Road
North Carolina 27103
scausey@allied-engsurv.com
Certification Statement:
I certify, under penalty of law that this Supplement-EZ form and all supporting information were prepared under my direction cr 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-
R�`.�, CA Rt
2� APT
1970�
Signature of Designer
!2 zo
-44qwl 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
If so, number of low density drainage areas
0
5
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE
AREA INFORMATION
Entire Site
1
4
Type of SCM
wet pond
wet pond
5
Total drainage area (sq ft)
1,139,630
1,139,630
6
Onsite drainage area (sq ft)
929,354.00
929,354.00
7
Offsite drainage area (sq ft)
209,995.00
209,995.00
8
Total BUA in project (sq ft)
328,667.00
328,667.00
9
New BUA on subdivided lots (subject to permitting)
(sq ft)
New BUA not on subdivided lots (subject to
permitting) (sf)
n/a
n/a
10
311,270.00
311,270.00
0.00
11
offsite BUA (sq ft)
0.00
12
Breakdown of new BUA not on subdivided lots:
n/a
n/a
- Parking (sq ft)
109,474.00
109,474.00
- Sidewalk (sq ft)
16,074.00
16,074.00
- Roof (sq ft)
63,941.00
63,941.00
- Roadway (sq ft)
77,948.00
77,948.00
- Future (sq ft)
43,560.00
43,560.00
- Other, please specify in the comment box
below (sq ft)
n/a
n/a
13
New infiltrating permeable pavement on subdivided
lots (sq ft)
n/a
n/a
14
New infiltrating permeable pavement not on
1subdivided lots (sq ft)
n/a
n/a
15
Existing BUA that will remain (not subject to
permitting) (sq ft)
17,397.00
17,397.00
16
1 Existing BUA that is already permitted (sq ft)
0.00
0.00
17
Existing BUA that will be removed (sq ft)
0.00
0.00
18
Percent BUA
25.15
25.15
19
Design storm (inches)
1.00
1.00
20
Design volume of SCM (cu ft)
29,385.00
29,385.00
21
lCalculation method for design volume
Simple Method
Simple Method
ADDITIONAL
INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
WET POND
Wet Pond
1
Drainage area number
POI 1
2
Minimum required treatment volume cu ft
28678 cf
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
5 What are the side slopes of the SCM (H:V)?
6 Does the SCM have retaining walls, gabion walls or other engineered
side slopes?
Are the inlets, outlets, and receiving stream protected from erosion
7 (10-year storm)?
3:1, 6:1
VEGETATED
SHELF
Yes
Yes
8
Is there an overflow or bypass for inflow volume in excess of the
design volume?
Yes
9
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
13
If the SCM is on a single family lot, does (will?) the plat comply with
General MDC (10)?
N/A
141
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 desi ned bv an NC licensedprofessional?
Yes
WET POND
MDC FROM 02H .1053
18
Sizing method used
SA/DA
19
Has a stage/storage table been provided in the calculations?
Yes
20
Elevation of the excavated main pool depth (bottom of sediment
removal) (fmsl)
750.50
21
Elevation of the main pool bottom (top of sediment removal) (fmsl)
751.00
22
Elevation of the bottom of the vegetated shelf (fmsl)
755.75
23
Elevation of the permanent pool (fmsl)
756.00
24
Elevation of the top of the vegetated shelf (fmsl)
756.25
25
Elevation of the temporary pool (fmsl)
759.50
26
Surface area of the main permanent pool (square feet)
13883
27
Volume of the main permanent pool (cubic feet)
48113 cf
28
Average depth of the main pool (feet)
3.80 ft
29
Average depth equation used
Equation 3
30
If using equation 3, main pool perimeter (feet)
476.7 ft
31
If using equation 3, width of submerged veg. shelf (feet)
3.0 ft
32
Volume of the forebay (cubic feet)
8419 cf
33
Is this 15-20% of the volume in the main pool?
Yes
34
Clean -out depth for forebay (inches)
66 in
35
Design volume of SCM (cu ft)
29385 cf
36
Is the outlet an orifice or a weir?
Weir
37
If orifice, orifice diameter (inches)
4 in
38
If weir, weir height (inches)
82 in
39
If weir, weir length (inches)
240 in
40
Drawdown time for the temporary pool (days)
2
41
Are the inlet(s) and outlet located in a manner that avoids short-
circuiting?
Yes
42
Are berms or baffles provided to improve the flow path?
I No q �R
M 8/30/2022
WET POND
43
Depth of forebay at entrance (inches)
48 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)
Does the orifice drawdown from below the top surface of the
permanent pool?
6:1
48
No
49
Does the pond minimize impacts to the receiving channel from the 1-
yr, 24-hr storm?
Are fountains proposed? (If Y, please provide documentation that
IMDC(9) is met.)
Yes
50
No
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
54
Hasa planting plan been provided for the vegetated shelf?
Yes
ADDITTRAL INFORMATION
55 Please use this space to provide any additional information about the
wet pond(s):
Wet Pond 2 9:08 AM 8/30/2022