SW6190602_Supplement EZ Form_20190619

WET POND
Edgerton Industrial Park Storm Pond
THE DRAINAGE AREA 1
Drainage area number
1
Break down of BUA in the drainage area (both new and existing):
Total coastal wetlands area (sq ft)
0
Parking / driveway (sq ft)
Total surface water area (sq ft)
0
Sidewalk (sq ft)
Total drainage area (sq ft)
745436 sf
Roof (sq ft)
BUA associated with existing development (sq ft)
sf
Roadway (sq ft)
Proposed new BUA (sq ft)
559077 sf
Other, please specify in the comment box below (sq ft)
559077 sf
Percent BUA of drainage area
75 %
Total BUA (sq ft)
559077 sf
COMPLIANCE WITH THE APPLICABLE STORMWATER PROGRAM
Stormwater program(s) that apply (please specify):
Design rainfall depth (in)
1.0 in
Phase II Post -Construction SW
Minimum volume required (cu ft)
18696 cf
Design volume of SCM (cu ft)
67819 cf
GENERAL MDC FROM 02H .1050
#1 Is the SCM sized to treat the SW from all surfaces at build -out?
Yes
#7 If applicable, with the SCM be cleaned out after construction?
Yes
#2 Is the SCM located on or near contaminated soils?
No
#8 Does the mainetenance access comply with General MDC (8)?
Yes
#3 What are the side slopes of the SCM (H:V)?
3:1
#9 Does the drainage easement comply with General MDC (9)?
Yes
#3 Does the SCM have retaining walls, gabion walls or other engineered side slopes?
No
#10 If the SCM is on a single family lot, does the plat comply with General MDC (10)?
#4 Are the inlets, outlets, and receiving stream protected from erosion (10-yearstorm)?
Yes
#11 Is there an O&M Agreement that complies with General MDC (11)?
Yes
#5 Is there a a bypass for flows in excess of the design flow?
Yes
#12 Is there an O&M Plan that complies with General MDC (12)?
Yes
#6 What is the method for dewatering the SCM for maintenance?
Pump (preferred)
#13 Was the SCM designed by an NC licensed professional?
Yes
WET POND MDC FROM 02H .1 553
#1 Method used
SA/DA
#6 Width of the vegetated shelf (feet)
6 It
1 Surface area of the main permanent pool (square feet)
25658 sf
#6 Location of vegetated shelf
@ Normal Pool
1 Volume of the main permanent pool (cubic feet)
128494 cf
#6 Elevation of top of shelf (fmsl)
147 It
2 Average depth of the main pool (feet)
5.0 ft
96 Elevation of bottom of shelf (fmsl)
146 It
2 Was the vegetated shelf included in the calculation of average depth?
Yes
96 Slope of vegetated shelf (H:V)
6:1
2 Elevation of the bottom of the permanent pool (fmsl)
140 ft
7 Diameter of drawdown orifice (inches)
4.0 in
2 Elevation of the top of the permanent pool (fmsl)
146.0 ft
7 Drawdown time for the temporary pool (hours)
57 hrs
2 Elevation of the top of the temporary pool (fmsl)
147.85 It
7 Does the orifice drawdown from below the top surface of the permanent pool?
Yes
3 Depth provided for sediment storage (inches)
12 in
#8 Does the pond minimize impacts to the receiving channel from the 1-yr, 24-hr storm?
Yes
94 Are the inlet(s) and outlet located in a manner that avoids short-circuiting?
Yes
#9 Are fountains proposed?
No
#4 Describe any measures, such as berms or baffles, that will be taken to improve the flow path:
#9 If yes, is documentation provided per Wet Pond MDC (9)?
N/A
#10 Is a trash rack or other device provided to protect the outlet system?
Yes
5 Volume of the forebay (cubic feet)
26685
#11 Are the dam and embankment planted in non -clumping turf grass?
Yes
5 Is this 15-20 % of the volume in the main pool?
Yes
#11 Species of turf that will be used on the dam and embankment
Bermuda
5 Depth of forebay at entrance (inches)
90 in
#11 Describe the planting plan for the vegetated shelf:
5 Depth of forebay at exit (inches)
78 in
Vegetated shelf to be planted with a combination of shallow water and shallow land plants, spacings to be a maximum o
18 inches on center. Fertilizer shall be used according to recommendation from soil analysis. See plan details for listing
of plants to be used.
5 Does water flow out of the forebay in a non -erosive manner?
Yes
5 Clean -out depth for forebay (inches)
12 in
5 Will the forebay be cleaned out when the depth is reduced to less than the above?
Yes
ADDITIONAL INFORMATION
Please use this space to provide any additional information about this wet pond that you think is relevant to the review:
Wet Pond 1 7:48 PM 6/19/2019

WET POND Edgerton Industrial Park Storm Pond
Wet Pond 2 7:48 PM 6/19/2019