HomeMy WebLinkAboutSW6220604_Supplement-EZ Form_20220926SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name
2 Proiect Area (ac)
4 Surface Water Area ac
5 Is this project High or Low Density?
6 Does this project use an off -site SCM?
HARRINGTON PLACE RESIDENTIAL DEV'T
77.12
0.6
Low
No
COMPLIANCE WITH 02H .1003(4)
7
Width of vegetated setbacks provided feet
30
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 ?
N/A
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
0
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
1 Dry Pond
0
23
StormFilter
0
24
Silva Cell
Bayfilter
Filterra
0
25
0
26
0
FORMS LOADED
DESIGNER CERTIFICATION
27
IName and Title:
Or anization:
Street address:
Jeremy R. Thomas, PE
28
J THOMAS ENGINEERING INC.
29
143 CHARLOTTE AVE, STE 104
SANFORD, NC 27330
30
City, State, Zip:
31
Phone numbers :
919-777-6010
32
Email:
JTHOMAS@JTHOMASENGINEERING.COM
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.
Designer
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Signature o Designer
Date
9-26-2022
DRAINAGE AREAS
1
Is this a high density project?
No
2
If so, number of drainage areas/SCMs
0
3
Does this project have low density areas?
Yes
4
If so, number of low density drainage areas
1
5
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
LD 1
4
Type of SCM
None
none
5
Total drainage area (sq ft
3333200
3333200
6
Onsite drainage area (sq ft
3333200
3333200
7
Offsite drainage area (sq ft
0
0
8
Total BUA in project (sq ft
378600 sf
378600
9
New BUA on subdivided lots (subject to permitting)
(sq ft
241500 sf
241500
10permitting)
New BUA not on subdivided lots (subject to
s
137100 sf
137100
11
Offsite BUA (sq ft
sf
12
Breakdown of new BUA not on subdivided lots:
- Parking (sq ft
sf
0
-Sidewalk (sft
sf
0
-Roof (s ft
sf
0
- Roadway s ft
- Future (sq ft
- Other, please specify in the comment box
below (sq ft
121100 sf
121100
sf
0
16000 sf
sf
16000
13
New infiltrating permeable pavement on
Isubdivided lots (sq ft
0
14
New infiltrating permeable pavement not on
subdivided lots (sq ft
sf
0
15permitting)
Existing BUA that will remain (not subject to
s ft
sf
0
16
Existing BUA that is already permitted (sq ft
sf
0
17
Existing BUA that will be removed (sq ft
sf
0
18
Percent BUA
11.4%
11.4%
19
Design storm inches
N/A
N/A
20
1 Design volume of SCM cu ft
N/A
N/A
21
1 Calculation method for design volume
N/A
N/A
NAIL INFORMATION
IIPlease use this space to provide any additional information about the I
22 drainaoe area(s):
drive and parking area for trail (open space amenity)
LOW DENSITY
DESIGN
REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H .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)?
Yes
4
Side slopes of the vegetated conveyances (H:V)
4:1
5
Maximum velocity in the vegetated conveyances during the 10-year storm?
3.7
6
Are curb outlet swales proposed?
No
7
Maximum longitudinal slope of curb outlet swale(s) (% )
8
Bottom width of curb outlet swale(s) (feet)
9
Maximum side slope of curb outlet swale(s) (H:V)
10
Minimum length of curb outlet swale(s) (feet)
11
Are treatment swales used instead of curb outlet swales?
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
JAre variations to rule .1003 proposed?
No
ADDITIONAL INFORMATION
15 Please use this space to provide any additional information about this low density project:
Swale 23 has 3:1 sideslopes.
Swale
#
Drainage
Area
ac
BUA
(ac)
Pervious
area
ac
C
Q
(cfs)
Slope
M
V,,,ow
(fps)
. V-,
(fps)
Flow depth
(ft)
1
0.50
0.13
0.37
0.50
2.00
1.10
5.00
2.00
0.50
2
2.30
0.53
1.77
0.40
7.30
1.00
5.00
2.70
0.80
3
0.10
0.03
0.07
0.50
0.40
2.40
5.00
0.80
020
4
2.80
0.46
2.34
0.40
8.80
0.90
5.00
2.60
0.70
5
0.40
0.11
029
0.44
1.40
120
5.00
120
0.50
6
5.00
0.51
4.49
0.40
15.80
1.00
5.00
320
0.90
7
0.30
0.07
023
0.40
0.90
120
5.00
1.00
0.50
8
3.00
0.31
2.69
0.40
9.50
120
5.00
3.00
0.70
9
0.05
0.01
1 0.04
0.40
020
1120
3.50
1.40
1 020
10
0.30
0.01
029
0.30
0.70
7.50
4.50
1.60
0.30
11
025
0.11
0.18
0.70
1.40
5.70
4.50
2.30
0.40
12
020
0.10
0.14
0.70
1.10
1.00
5.00
0.90
0.60
13
5.30
022
5.08
0.40
16.70
1.00
5.00
3.30
1.10
14
0.30
0.06
024
0.40
0.90
1.10
5.00
0.90
0.50
15
1.30
022
1.08
0.40
4.10
1.10
5.00
2.40
0.70
16
0.30
0.14
0.16
0.70
1.70
520
4.50
2.30
0.40
17
120
027
0.93
0.40
3.80
1.90
5.00
2.80
0.40
18
5.50
1.00
4.50
0.40
17.40
0.90
5.00
320
120
19
0.10
0.03
0.07
0.50
0.40
1.00
5.00
0.70
0.40
20
020
0.05
0.15
0.50
0.80
1.00
5.00
0.80
0.50
21
025
0.06
0.19
0.50
1.00
720
4.50
1.80
0.40
22
0.05
0.02
0.03
0.60
020
3.70
5.00
0.90
020
23
16.80
2.62
14.18
0.41
55.00
0.50
5.00
3.60
1.80
24
1.50
0.32
1.18
0.50
5.90
2.70
5.00
3.60
0.40
25
1.70
0.42
128
0.52
7.00
1.40
5.00
2.90
0.60
26
0.30
0.10
020
0.50
120
2.00
5.00
1 1.50
0.50
27
0.40
0.12
028
0.50
1.60
2.00
5.00
1.60
0.50
28
0.60
0.12
0.48
0.46
220
4.70
5.00
2.40
0.50
29
1.60
0.38
122
0.40
5.10
3.10
5.00
3.60
0.60
r30
0.50
0.10
0.40
0.40
2.00
3.10
5.00
2.00
0.50
Pervious
area
(ac)
Slope
Vactu 1
(fps;