20061804 Ver 36_Stormwater Supplement Form_20201204

SUPPLEMENT=EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name Whitley Corner
2
Project Area ac
47.05
3
Coastal Weiland Area ac
0
4
Surface Water Area ac
0
5
Is this project High or Low Density?
High
6
Does this project use an off -site SCM?
No
COMPLIANCE WITH 02H .1003(4
7
Width of vegetated setbacks provided feet
6
8
Will the vegetated setback remain vegetated?
Yes
9
Is BUA other that as listed in .1003 4 c-d out of the setback?
No
10
Is streambank stabilization proposed
on this project?
No
NUMBER AND TYPE OF SCMs:
11
Infiltration System
0
12
Bioretention Cell
0
13
Wet Pond
2
14
Stormwater Wetland
0
15
Permeable Pavement
0
16
Sand Filter
0
17
Rainwater Harvesting RWH
0
18
Green Roof
0
19
Level Spreader -Filter Strip LS-FS
0
20
Disconnected Impervious Surface
(DIS)
0
21
Treatment Swale
0
22
Dry Pond
0
23
StormFilter
0
24
Silva Cell
0
25
113ayfilter
0
26
Filterra
0
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
Mike Stocks, P.E.
28
Organization:
Stocks Engineering
29
Street address:
801 E Washington St.
30
City, State, Zip:
Nashville, NC 27856
31
Phone number(s):
252459-8196
32
Email:
[e-mail]
Certification Statement:
I cert'rfy, under penalty of law that this Supplement-EZ form and all supporting information were prepared under my direction or
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.
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Date

DRAINAGE AREAS
high density project?
Yes
umber of drainage areas/SCMs
2
t of this project subject to previous rule
ff,,eirsi.ns?
No
FORMS LOADED
DRAINAGE AREA INFORMATION A
Entire Site
1
2
4
Type of SCM
Wet Pond
Wet Pond
5
Total BUA in project (sq ft)
897988 sf
372733 sf
525255 sf
6
New BUA on subdivided lots (subject to permitting)
(sq ft)
620040 sf
213825 sf
406215 sf
7
New BUA outside of subdivided lots (subject to
permitting) (sf)
277948 sf
158908 sf
119040 sf
8
Offsite - total area (sq ft)
None
9
Offsite BUA (sq ft)
None
10
Breakdown of new BUA outside subdivided lots:
Parking (sq ft)
20520 sf
6300 sf
14220 sf
Sidewalk (sq ft)
38340 sf
20870 sf
17470 sf
Roof (sq ft)
Roadway (sq ft)
219088 sf
131738 sf
87350 sf
Future (sq ft)
Other, please specify in the comment box below
(sq ft)
11
New infiltrating permeable pavement on subdivided
lots (sq ft)
None
12
New infiltrating permeable pavement outside of
subdivided lots (sq ft)
None
13
Exisitng BUA that will remain (not subject to
permitting) (sq ft)
None
14
Existing BUA that is already permitted (sq ft)
None
15
Existing BUA that will be removed (sq ft)
None
16
Percent BUA
44%
56%
68%
17
Design storm (inches)
1 in
1 in
18
Design volume of SCM (cu ft)
30750 cf
42598 cf
19
Calculation method for design volume
SIMPLE
SIMPLE
ADDITIONAL INFORMATION
20
Please use this space to provide any additional information about the
drainage area(s):

WET POND
11 Drainage area number
21 Design volume of SCM (cu ft)
GENERAL MDC FROM 02H .1050 =
31 Is the SCM sized to treat the SW from all surfaces at build -out?
1
2
30750 cf
42598 cf
Yes Yes
4
Is the SCM located away from contaminated soils?
Yes
Yes
5
What are the side slopes of the SCM (H:V)?
2:1
2:1
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
81
Is there an overflow or bypass for inflow volume in excess of the
design 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)?
Yes
Yes
141
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 specific MDC?
Yes
Yes
17 Was the SCM designed by an NC licensed professional?
WET POND MDC FROM 02H .1053
181 Method used
Yes
SA/DA
Yes
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)
256.00
229.00
21
Elevation of the main pool bottom -(top of sediment removal) (fmsl)
257.00
232.00
22
Elevation of the bottom of the vegetated shelf (fmsl)
261.00
237.00
23
Elevation of the permanent pool (fmsl)
262.00
238.00
241
Elevation of the top of the vegetated shelf (fmsl)
262.00
238.00
251
Elevation of the temporary pool (fmsl)
265.02
241.05
26
Surface area of the main permanent pool (square feet)
14734 sf
14970 sf
27
Volume of the main permanent pool (cubic feet)
48547 cf
57208 cf
28
Average depth of the main pool (feet)
3.23 ft
3.46 ft
29
Average depth equation used
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)
11055 cf
11320 cf
33
Is this 15-20% of the volume in the main pool?
Yes
Yes
34
Clean -out depth for forebay (inches)
35
Design volume of SCM (cu ft)
30750 cf
42598 cf
36
Is the outlet an orifice or a weir?
Orifice
Orifice
37
If orifice, orifice diameter (inches)
3.0 in
4.0 in
38
If weir, weir height (inches)
39
If weir, weir length (inches)
40
Drawdown time for the temporary pool (days)
2.6
2.0
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)
60 in
48 in
44
Depth of forebay at exit (inches)
60 in
48 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
permanent pool?
Yes
Yes
49
Does the pond minimize impacts to the receiving channel from the 1-
yr, 24-hr storm?
Yes
Yes
501
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
I Centipede
54
Has a planting plan been provided for the vegetated shelf?
Yes Yes
ADDITIONAL INFORMATION
55
Please use this space to provide any additional information about the
wet pond(s):
Wet Pond 1 2:53 PM 11/19/2020