SW5221102_Supplement-EZ Form_20230414

WET POND
1
Draina a area number
1
2
21
Minimum required treatment volume cu ft
40558 cf
9449 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?
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
side slopes?
No
No
7
Are the inlets, outlets, and receiving stream protected from erosion
(10-year storm)?
Yes
Yes
8
Is there an overflow or bypass for inflow volume in excess of the
desi n volume?
Yes
Yes
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
General MDC (10)?
N/A
N/A
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
161
Does the SCM follow the device specific MDC?
Yes
Yes
17
Was the SCM designed by an NC licensedprofessional?
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
removal) (fmsl
236.00
245.00
21
Elevation of the main pool bottom (top of sediment removal) (fmsl)
237.00
246.00
22
Elevation of the bottom of the vegetated shelf (fmsl)
243.00
253.00
23
Elevation of the permanent pool (fmsl)
243.50
253.50
24
Elevation of the top of the vegetated shelf fmsl
244.00
254.00
25
Elevation of the temporary pool (fmsl)
245.50
255.50
26
Surface area of the main permanent pool (square feet
20568
5621
27
Volume of the main permanent pool (cubic feet)
87533 cf
24589 cf
28
Average depth of the main pool feet
4.30 ft
4.40 ft
29
Average depth equation used
Equation 2
Equation 2
30
If usinga uation 3, main pool perimeter feet
31
If using equation 3, width of submerged veg. shelf (feet)
32
Volume of the forebay cubic feet
16552 cf
4796 cf
33
Is this 15-20% of the volume in the main pool?
Yes
Yes
34
Clean -out depth for forebay inches
54 in
36 in
35
Design volume of SCM (cu ft)
61872 cf
18953 cf
361
Is the outlet an orifice or a weir?
Orifice
Orifice
37
If orifice, orifice diameter (inches)
3 in
2 in
38
If weir, weir height inches
39
If weir, weir length (inches)
40
Drawdown time for the temporary pool (days)
3.2
4.5
41
Are the inlet(s) and outlet located in a manner that avoids short-
circuiting?
Yes
Yes
42
Are berms or baffles provided to improve the flow path?
No
No
43
Depth of rebay at entrance inches
54 in
36 in
44
Depth of forebay at exit (inches)
42 in
24 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
48
Does the orifice drawdown from below the top surface of the
permanentpool?
Yes
Yes
49
Does the pond minimize impacts to the receiving channel from the 1-
r, 24-hr storm?
Yes
Yes
50
Are fountains proposed? (If Y, please provide documentation that
MDC 9 is met.
No
No
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
Centipede
Centipede
54
Hasa planting plan been provided for the vegetated shelf?
Yes
Yes
ADDITIONAL INFORMATION
3
55
Please use this space to provide any additional information about the
wet pond(s):
0mFk0meter is 325' for drainage area 1 pond and 1.5 for drainage area 2 ond.
2:24 PM 4/12/2023

LOW DENSITY
DESIGN
REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H .1003
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)
3:01
5
Maximum velocity in the vegetated conveyances during the 10-year storm?
2.59
6
Are curb outlet swales proposed?
Yes
7
Maximum longitudinal slope of curb outlet swale(s) (%)
2
8
Bottom width of curb outlet swale(s) (feet)
2 It
9
Maximum side slope of curb outlet swale(s) (H:V)
3:1
10
Minimum length of curb outlet swale(s) (feet)
110 ft
11
Are treatment swales used instead of curb outlet swales?
No
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:
The Remaining swale results are in the Swale Calculations package. There are 47 in total. S47 is the Curb Outlet. The swales
side slopes range from 15:1 to 3:1.
Swale
#
Drainage
Area
ac
BUA
(ac)
Pervious
area
ac
C
Q
(cfs)
Slope
( % )
V,,,o,,,
(fps)
V-,
(fps)
Flow depth
(ft)
1
021
0.07
0.14
0.58
0.81
0.02
4.50
1.12
022
2
0.31
0.07
024
0.52
1.08
0.02
4.50
1.69
0.40
3
024
0.07
0.17
0.56
0.89
0.05
4.50
2.47
0.30
4
1 021
0.07
0.14
0.58
0.81
0.02
4.50
1.12
022
5
021
0.07
0.14
0.58
0.81
0.02
4.50
1.12
022
6
0.19
0.07
0.12
0.60
0.76
0.05
4.50
1.90
020
7
0.31
0.07
021
0.49
1.19
0.02
4.50
1.53
0.36
8
0.15
0.07
0.08
0.66
0.65
0.02
4.50
1.08
020
9
0.15
0.07
0.08
0.66
0.65
0.03
4.50
1 1.47
021
10
0.16
0.07
0.09
0.64
0.68
0.02
4.50
1.03
021
11
0.15
0.07
0.08
0.66
0.65
0.02
4.50
122
0.19
12
0.15
0.07
0.08
0.66
0.65
0.04
4.50
1.52
0.17
13
0.15
0.07
0.08
0.66
0.65
0.05
4.50
1.69
0.16
14
0.15
0.07
0.08
0.66
0.65
0.02
4.50
1.13
024
15
0.16
0.07
0.09
0.64
0.68
0.02
4.50
1 1.18
024
16
0.17
0.07
0.10
0.63
0.71
0.02
4.50
123
024
17
0.15
0.07
0.08
0.66
0.65
0.02
4.50
1.13
024
18
0.15
0.07
0.08
0.66
0.65
0.02
4.50
1.13
024
19
0.13
0.07
0.06
0.70
0.60
0.02
4.50
1.13
023
20
0.10
0.07
0.03
0.79
0.52
0.02
4.50
0.96
0.19
21
0.09
0.07
0.02
0.83
0.49
0.02
4.50
1 1.01
0.18
22
0.10
0.07
0.03
0.79
0.52
0.03
4.50
1.35
0.16
23
0.11
0.07
0.04
0.75
0.55
0.05
4.50
1.63
0.15
24
0.17
0.07
0.10
0.63
0.71
0.02
4.50
1.07
021
25
0.15
0.07
0.08
0.66
0.65
0.02
4.50
1.08
020
26
0.12
0.07
0.05
0.72
0.57
0.05
4.50
1.76
0.18
27
0.12
0.07
0.05
0.72
0.57
0.02
1 4.50
0.66
024
28
0.13
0.07
0.06
1 0.70
1 0.60
0.02
4.50
1.00
020
29
0.16
0.07
0.09
0.64
0.68
0.02
4.50
1.07
020
30
022
0.07
0.15
0.58
0.84
0.02
4.50
1.16
0.84