SW3221008_Supplement-EZ Form_20230515

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)
1
5
Maximum velocity in the vegetated conveyances during the 10-year storm?
5
6
Are curb outlet swales proposed?
Yes
7
Maximum longitudinal slope of curb outlet swale(s) (%)
4
8
Bottom width of curb outlet swale(s) (feet)
2 ft
9
Maximum side slope of curb outlet swale(s) (H:V)
3:1
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
ADDITIO ORMATION
15 Please use this space to provide any additional information about this low density project:
The swale calcs are based on swales numbered 5-10, Swale 11 is for the bypass channel flow, and the vegetated paths are
natural ground conveyance overland through the 200 vegetated buffer.
Swale
#
Drainage
Area
BUA
(ac)
Pervious
area
C
Q
(cfs)
Slope
M
V.11-
(fps)
V.-I
(fps)
Flow depth
(ft)
1
2
3
4
5
1.48
0.41
1.07
0.50
5.65
3.33
5.00
3.99
0.43
6
1.23
0.33
0.90
0.50
4.69
4.11
5.00
4.08
0.37
7
1.17
0.38
0.79
0.50
4.47
3.95
5.00
3.88
0.37
8
0.68
0.23
0.45
0.50
2.59
2.22
5.00
2.73
0.32
9
0.62
0.23
0.39
0.50
2.36
2.22
5.00
2.71
0.30
10
0.62
0.23
0.39
0.50
2.36
1.49
5.00
2.30
0.34
11
7.87
0.00
7.87
0.50
30.06
1.00
5.00
3.78
0.91
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
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