SW3190503_SuppEZ-2018-Version-2.1.1_8/6/2019

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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)
3 sf
5
Maximum velocity in the vegetated conveyances during the 10-year storm?
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
ADDITIONAL
15
Are variations to rule .1003 proposed? No
INFORMATION
1 Please use this space to provide any additional information about this low density project:
The site was designed to maximize protection of sensitive environmetal areas and preserve them in common open space. No curb is
proposed. Max. velocity in swales is 3.38 ft/sec. prior to entry into underground storm drain system that transports the flow from the street
ditches to the stream buffer. Piping is used to minimize erosion on steep slopes and reduce energy and velocity prior to release. Refer to
attached plans and calculations for additional design information. Please note that for ditches designated with a letter, they are designed for
maximum drainage area and the build u on area is variable. The maximum C value of 0.6 was used for all lettered ditches.
DrainagT Pervious
Swale BUA
Area (ac) area
# ac ac
C
Q
(cfs)
Slope
(/o) o
Vallow
(fps)
Vactual
(fps)
Flow depth (ft)
1
0.27
0.05
0.22
0.50
1.03
3.60
4.50
0.82
0.71
2
1.77
0.50
1.22
0.40
5.39
4.00
4.50
1.36
0.78
3
3.98
1.12
2.86
0.40
12.00
2.74
4.50
1.73
1.03
4
9.17
1.67
7.50
0.40
15.11
2.88
4.50
3.07
0.87
5
2.84
0.37
2.47
0.40
9.73
3.60
4.50
6.51
0.71
6
0.20
0.00
0.20
0.30
0.46
1.00
4.50
0.58
0.51
7
0.7*
TYPE A
varies**
0.60
3.20
1.00
4.50
0..78
1.17
8
1.18*
TYPE B
varies**
0.60
5.40
1.00
4.50
1.02
1.17
9
1.75*
TYPE C
varies**
0.60
8.00
1.00
4.50
1.25
1.17
10
2.74*
TYPE D
varies**
0.60
12.50
5.21
4.00
3.38
0.72

TYPE E
I varies --
the drainge are indicated is the largest of it's class.
the pervious area varies based on individual areas. A C value of 0.6 was used on all is the highest
value encountered.