SW6230705_Supplement-EZ Form_20240604 (2)

WET POND
ii Drainage area number 12 13 14 15 16
2 Minimum required treatment volume(cu ft _ 17979 cf I 40362 cf I 265 0 cf I 27062 cf I 23670 cf J
GENERAL MDC FROM 02H.1050
3 Is the SCM sized to treat the SW from all surfaces at build-out? _ Yes Yes _ Yes Yes Yes
4 Is the SCM located away from contaminated soils? _ Yes Yes _ Yes Yes Yes
5 What are the side slopes of the SCM(H:V)? _ 3:1 3:1 3:1 3:1 3:1
6 Does the SCM have retaining walls,gabion walls or other No No Yes No Yes
engineered side slopes? _
7 Are the inlets,outlets,and receiving stream protected from erosion Yes Yes Yes Yes Yes
(10-year storm)? _
8 Is there an overflow or bypass for inflow volume in excess of the Yes Yes Yes Yes Yes
design volume?
9 What is the method for dewatering the SCM for maintenance? _ Pump(preferred) Pump(preferred) Pump(preferred) Pump(preferred) Pump(preferred)
10 If applicable,will the SCM be cleaned out after construction? _ Yes Yes _ Yes Yes Yes
11 Does the maintenance access comply with General MDC(8)? _ Yes Yes _ Yes Yes Yes
12 Does the drainage easement comply with General MDC(9)? Yes Yes _ 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 N/A N/A
General MDC(10)?
14 Is there an O&M Agreement that complies with General MDC(11)? Yes Yes Yes Yes Yes
15 Is there an O&M Plan that complies with General MDC(12)? _ Yes Yes Yes Yes Yes
16 Does the SCM follow the device specific MDC? Yes Yes Yes Yes Yes
17 Was the SCM designed by an NC licensed rofessional? Yes Yes Yes Yes Yes
WET POND MDC FROM 02H.1053
18 Sizing method used SA/DA SA/DA SA/DA SA/DA SA/DA
19 Has a stage/storage table been provided in the calculations? Yes Yes Yes Yes Yes
20 Elevation of the excavated main pool depth(bottom of sediment 306.50 301.50 297.50 290.50 273.50
removal)(fmsl)
21 Elevation of the main pool bottom(top of sediment removal)(fmsl) 307.00 302.00 298.00 291.00 274.00
22 Elevation of the bottom of the vegetated shelf(fmsl) 312.00 307.00 302.50 295.00 279.00
23 Elevation of the permanent pool(fmsl) 312.50 307.50 303.00 295.50 279.50
24 Elevation of the top of the vegetated shelf(fmsl) 313.00 308.00 303.50 296.00 280.00
25 Elevation of the temporary pool(fmsl) 313.86 309.42 304.82 296.79 281.02
26 Surface area of the main permanent pool(square feet) 9633 16644 10658 16831 12144
27 Volume of the main permanent pool(cubic feet) 34387 cf 68687 cf 41003 cf 61958 cf 51599 cf
28 Average depth of the main pool(feet) 3.60 ft 4.10 ft 3.90 ft 3.50 ft 4.20 ft
29 Average depth equation used Equation 2 Equation 2 Equation 2 Equation 2 Equation 2
30 If using equation 3,main pool perimeter(feet)
31 If using equation 3,width of submerged veg.shelf(feet)
32 Volume of the forebay(cubic feet) 5917 cf 12614 cf 7358 cf 9950 cf 9538 cf
33 Is this 15-20%of the volume in the main pool? Yes Yes Yes Yes Yes
34 Clean-out depth for forebay(inches) 66 in 66 in 49 in 54 in 66 in
35 Design volume of SCM(cu ft) 19036 cf 46650 cf 28551 cf 28341 cf 25863 cf
36 Is the outlet an orifice or a weir? Orifice Orifice Orifice Orifice Orifice
37 If orifice,orifice diameter(inches) 2 in 3 in 3 in 3 in 3 in
38 If weir,weir height(inches)
39 If weir,weir length(inches)
40 Drawdown time for the temporary pool(days) 2 2.8 2 2.1 2.2
41 Are the inlet(s)and outlet located in a manner that avoids short- Yes Yes Yes Yes Yes
circuiting?
42 Are berms or baffles provided to improve the flow path? No No No No No
43 Depth of forebay at entrance(inches) 90 in 90 in 84 in 78 in 90 in
44 Depth of forebay at exit(inches) 74 in 74 in 67 in 61 in 73 in
45 Does water flow out of the forebay in a non-erosive manner? Yes Yes Yes Yes Yes
46 Width of the vegetated shelf(feet) 6 ft 6 ft 6 ft 6 ft 6 ft
47 Slope of vegetated shelf(H:V) 6:1 6:1 6:1 6:1 6:1
48 Does the orifice drawdown from below the top surface of the Yes Yes Yes Yes Yes
permanent pool?
49 Does the pond minimize impacts to the receiving channel from the 1- Yes Yes Yes Yes Yes
yr,24-hr storm?
50 Are fountains proposed?(If Y,please provide documentation that No No No No No
MDC(9)is met.)
51 Is a trash rack or other device provided to protect the outlet system? Yes Yes Yes Yes Yes
52 Are the dam and embankment planted in non-clumping turf grass? Yes Yes Yes Yes Yes
53 Species of turf that will be used on the dam and embankment centipede centipede centipede centipede centipede
54 Has a planting plan been provided for the vegetated shelf? Yes Yes _ Yes Yes Yes
ADDITIONAL INFORMATION
Please use this space to provide any additional information about
55 the wet pond(s):
SCM 12,14&16 orifice sizes:2.4",2.8"&2.7"
Wet Pond 1 8:05 AM 5/30/2024