SW4220601_Supplement-EZ Form_20220712

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1
Project Name _____
Havenbrooke Subdivision
2
Project Area (ac)
74.97
3
Coastal Wetland Area (ac)
0
_ 4
Surface Water Area (acL
0.78
5
Is this project High or Low Density?
Low
6
1 Does this project use an off -site SCM?
No
COMPLIANCE WITH 02H .1003(4)
7
Width of vegetated setbacks provided (feet)
_. _... ---- ... ....... �
30
w _8
Will the vegetated setback remain vegetated?
Yes
9
If BUA is proposed in the setback, does it meet NCAC 02H.1003(4)(c-d)?
NIA
10
Is streambank stabilization proposed on this project?
No
NUMBER AND TYPE OF SOMA:
11
Infiltration System
12
Bioretention Cell
13
_
Wet Pond
14
Stormwater Wetland
15
Permeable Pavement
16
Sand Filter
y
17
Rainwater Harvesting (RW H)
1Green
Roof
_ 19
Level Spreader -Filter Strip
20
Disconnected Impervious Surface (DIS)
_
21
Treatment Swale
_ 6
22
Dry Pond _
23
StormFilter
24
Silva Cell
25
Bayfilter
26 IFIlterra
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
James L. Walters, P.E.
28
Organization:
Latham -Walters Engineering, Inc.
29
Street address:
16507-A_Northcross Drive
30
City, State, Zip:
Huntersville, NC 28078
31
Phone number(s):
704-807-4134
32
Email:
[e-mail]
Certification Statement:
I certify, 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.
E,lor011$1#10""
® SEAL �
18564
- S -
m
'��NPnitrrrrrr k
'�" //G Igo zZ
Date

DRAINAGE AREAS
1
Is this a high density project?
No
2
If so, number of drainage areas/SCMs
3
Does this project have low density areas?
Yes
4
If so, number of low density drainage areas
6
5
Is all/part of this project subject to previous rule
versions?
No
CLICK TO LOAD FORM

LOW DENSITY
DESIGN
REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 021-11.1003
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)?
No
4
Side slopes of the vegetated conveyances (H:V)
3 sf
5
Maximum velocity in the vegetated conveyances during the 10-year storm?
6
6
Are curb outlet swales proposed?
Yes
7
Maximum longitudinal slope of curb outlet swale(s) (%)
5
8
Bottom width of curb outlet swale(s) (feet)
5 ft
9
Maximum side slope of curb outlet swale(s) (H:V)
:1
10
Minimum length of curb outlet swale(s) (feet)
100 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 JlPlease use this space to provide any additional information about this low density project:
A combination of curb outlets and treatment swales are proposed along with vegetated conveyance ditches.

TREATMENT SWALE
1
Drainage area number
Desi n flow rate of SCM cfs
1
2
3
2
3.61 cfs
1.65 cfs
1.31 cfs
GENERAL MDC FROM 02H .1050
3
Is the SCM sized to treat the SW from all surfaces at build -out?
Yes
Yes
Yes
4
Is the SCM located away from contaminated soils?
Yes
Yes
Yes
5
What are the side slopes of the SCM (H:V)?
3:1
3:1
3:1
6
Does the SCM have retaining walls, gabion walls or other
engineered side slopes?
No
No
No
7
Are the inlets, outlets, and receiving stream protected from erosion
10- ear storm)?
Yes
Yes
Yes
8
Is there an overflow or bypass for inflow volume in excess of the
design volume?
No
No
No
9
What is the method for dewatering the SCM for maintenance?
Other
Other
Other
10
If applicable, will the SCM be cleaned out after construction?
Yes
Yes
Yes
11
Does the maintenance access comply with General MDC (8)?
Yes
Yes
Yes
12
Does the drainage easement comply with General MDC (9)?
Yes
Yes
Yes
13
If the SCM is on a single family lot, does (will?) the plat comply with
General MDC 10 ?
Is there an O&M Agreement that complies with General MDC (11)?
Yes
Yes
Yes
14
Yes
Yes
Yes
15
Is there an O&M Plan that complies with General MDC (12)?
Yes
Yes
Yes
16
Does the SCM follow the device specific MDC?
Yes
Yes
Yes
17
Was the SCM designed by an NC licensedprofessional?
Yes
Yes
Yes
TREATMENT
SWALE MDC FROM 02H .1061
18
SHWT elevation (fmsl)
<832
<832
<832
19
Bottom of the treatment swale (fmsl)
838.00
852.00
852.00
20
Depth of treatment swale (feet)
2'
2'
2'
21
Is the swale trapezoidal in shape?
Yes
Yes
Yes
22
Width of bottom of swale (feet)
2 ft
2 ft
2 ft
23
Side slopes of treatment swale (H:V)
3:1
3:1
3:1
24
Length of swale (feet)
150 ft
140 ft
130 ft
25
Flow depth during the 0.75 inch/hour storm (inches)
3 in
3 in
2 in
26
Flow velocity during the 0.75 inch/hour storm (feet per second)
4 fps
3 fps
3 fps
27
Hydraulic retention time for swale (minutes)
4 min
4 min
4 min
28
Species of grass that will be used
Tall Fescue
Tall Fescue
Tall Fescue
29
Will the grass be maintained at an average height of 6 inches?
Yes
Yes
Yes
30
Will the grass not be cut lower than 4 inches?
Yes
No
No
31
Velocity during the 10-year storm (feet per second)
6 ft/s
6 ft/s
5 ft/s
32
Is the swale designed to non -erosive) ass the 10- ear storm?
Yes
Yes
Yes
ADDITIONAL
INFORMATION
33
Please use this space to provide any additional information about
the treatment swale(s):
TrSwale 4 1:57 PM 6/16/2022

TREATMENT SWALE
1
Drainage area number
Desi n flow rate of SCM cfs
4
5
6
2
1.84 cfs
1.31 cfs
.42 cfs
GENERAL MDC FROM 02H .1050
3
Is the SCM sized to treat the SW from all surfaces at build -out?
Yes
Yes
Yes
4
Is the SCM located away from contaminated soils?
Yes
Yes
Yes
5
What are the side slopes of the SCM (H:V)?
3:1
3:1
3:1
6
Does the SCM have retaining walls, gabion walls or other
engineered side slopes?
No
Yes
Yes
7
Are the inlets, outlets, and receiving stream protected from erosion
10- ear storm)?
Yes
Yes
Yes
8
Is there an overflow or bypass for inflow volume in excess of the
design volume?
No
No
No
9
What is the method for dewatering the SCM for maintenance?
Other
Other
Other
10
If applicable, will the SCM be cleaned out after construction?
Yes
Yes
Yes
11
Does the maintenance access comply with General MDC (8)?
Yes
Yes
Yes
12
Does the drainage easement comply with General MDC (9)?
Yes
Yes
Yes
13
If the SCM is on a single family lot, does (will?) the plat comply with
General MDC 10 ?
Is there an O&M Agreement that complies with General MDC (11)?
Yes
Yes
Yes
14
Yes
Yes
Yes
15
Is there an O&M Plan that complies with General MDC (12)?
Yes
Yes
Yes
16
Does the SCM follow the device specific MDC?
Yes
Yes
Yes
17
Was the SCM designed by an NC licensedprofessional?
Yes
Yes
Yes
TREATMENT
SWALE MDC FROM 02H .1061
18
SHWT elevation (fmsl)
<828
<836
<832
19
Bottom of the treatment swale (fmsl)
868.00
858.00
874.00
20
Depth of treatment swale (feet)
2'
2'
2'
21
Is the swale trapezoidal in shape?
Yes
Yes
Yes
22
Width of bottom of swale (feet)
2 ft
2 ft
2 ft
23
Side slopes of treatment swale (H:V)
3:1
3:1
3:1
24
Length of swale (feet)
167 ft
103 ft
125 ft
25
Flow depth during the 0.75 inch/hour storm (inches)
3 in
3 in
2 in
26
Flow velocity during the 0.75 inch/hour storm (feet per second)
3 fps
2 fps
1 fps
27
Hydraulic retention time for swale (minutes)
4 min
4 min
4 min
28
Species of grass that will be used
Tall Fescue
Tall Fescue
Tall Fescue
29
Will the grass be maintained at an average height of 6 inches?
Yes
Yes
Yes
30
Will the grass not be cut lower than 4 inches?
No
No
No
31
Velocity during the 10-year storm (feet per second)
6 ft/s
3 ft/s
1 ft/s
32
Is the swale designed to non -erosive) ass the 10- ear storm?
Yes
Yes
Yes
ADDITIONAL
INFORMATION
33
Please use this space to provide any additional information about
the treatment swale(s):
TrSwale 5 1:57 PM 6/16/2022