SW1191201_Supplement-EZ Form_20210818

WET POND
1 Drainage area number A2
B1
_
_ 2 Design volume of SCM (cu ft) 45874 cf 13124 cf
GENERAL Nldc FREW Q2H 1050
3 Is the SCM sized to treat the SW from all surfaces at build -out? yes *as
4 Is the SCM located away from contaminated soils?
Yes
Yes
5 W hat are the side slopes of the SCM (H:V)?
3:1
3:1
Does the SCM have retaining walls, gabion walls or other engineered
6 side slopes?
No
No
Are the inlets, outlets, and receiving stream protected from erosion
7 (10- ear storm)?
Yes
Yes
Is there an overflow or bypass for inflow volume in excess of the
8 desyn volume?
Yes
Yes
9 What is the method for dewatering the SCM for maintenance?
Drawdown Orifice
Drawdown Orifice
10' if applicable; VA the SCM be cleaned out after construction?
Yes
Yes
11 Does the maintenance access comply with Generat MDC (8)?
Yes
Yes
12 Does the drainage easement comply with General MDC (9)?
If the SCM is on a single family lot, does (will?) the plat comply with
13 General MDC (10)?
1
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 specjfto MDC?
Yes
Yes
17 Was the SCM designed by an NC licensed professional?
WET POND MDC FROM 02H .1053
18[Method used
Yes
SA/DA
Yes
SA/DA
19
Has a stagelstom a table been provided in the calculations?
Yes
Yes
20
Elevation of the excavated main pool depth (bottom of sediment
removal) (fmsl)
1196.00
1203.50
21
Elevation of the main pool bottom -(top of sediment removal) (fmsl)
1197.00
1204.00
22
Elevatlon'or the bottom of the.yegeWted shell (fmsl)
1201.00
1210.00
23
Elevation of the permanent pool (fmsl)
1201.50
1210.50
24
Elevallco ofthe,top of the vegetated shelf (fmsl)
1202.00
1211.00
25
Elevation of the temporary pool (fmsl)
1203.10
1212.25
261Surface
area of the main permanent pool (square feet)
21548.00
5502.00
27
Volume of the main permanent pool (cubic feet)
[ 71664 cf
18510 cf
281Average
depth of the main pool (feet)
3.33 ft
3.25 ft
29, Average,depth equaffon and
Equation 2
Equation 2
30
j If using equation 3, main pool perimeter (feet)
31
3 21
If using equation 3, width of submerged veg. shelf (feet)
Voluma of the forebay (cubic feet)
11876 cf
2940 cf
331
Is this 15-20% of the volume in the main pool?
Yes
Yes
34
Clean-vut depth for forebay (inches)
54 in
51 in
35
Design volume of SCM (cu ft)
45874 cf
13124 cf
36
is the outlet an orifice or a weir?
Orifice
Orifice
371
If orifice, orifice diameter (inches)
3.5 in
1.5 in
381
if weir, weir height (inches)
39[
If weir, weir length (inches)
40
Drawdown time for the temporary pool (days)
2.4
3.6
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 forebay at entrance (inches)
66 in
60 in
441
Depth of forebay at exit (inches)
[ 60 in
54 in
45
Does water flow out of the forebay in a non -erosive manner?
Yes
Yes
46
1 Wfdth of the vegetated shelf (fast)
6 ft
6 ft
471
Slope of vegetated shelf (H:V)
6:1
6:1
48
Does the orifice drawdown from below the top surface of the
permanent pool?
Yes
Yes
49
Does the pond minimize impacts to the receiving channel from the 1-
yr, 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
52IAre 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
Bermuda
Bermuda
54 1 Has a pts n ng p n.been provided for the vegetated she
e$ Yes
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
55 wet pond(s):
Parcel is state owned land, therefore no drainage easement is required.
Wet Pond 3 10:21 AM 8/10/2021