SW3190503_Executed Supp EZ form_8/8/2019

3Vr'r'ILGIVICIV 1—CL. VVVCf[ r'HVC
FORMS LOADED
T INFORMATION
1 Project Name Rone Creek Station
2 Project Area ac ' 58.64
3 Coastal Wetland Area (ac)-
A Q—F— IAhFcr Aroma (—I
5 Its this project High or Low Density?
6 1 Does this Droiect use an off -site SCM?
No
OMPLIAM MI ;t ' iflO3(4)
7 Width of vegetated setbacks provided (feet) 50
- -- ._
8 JVVill the vegetated setback remain vegetated? Yes
9 Ils BUA other that as listed in .1003 4 c-d out of the setback? IYes
10 Ils streambank stabilization proposed on this project? I No
UMBER AND TYPE OF SCMs:
11 Infiltration System _ _ l 0
12 Bioretention Cell � � 0
13
Wet Pond
0
~ _ 0
0
0
0
14
Stormwater Wetland
15
Permeable Pavement
16
Sand Filter
17
Rainwater Harvesting RWH
18
Green Roof
0
19
Level S reader -Filter Strip (IS-FS
0
20
Disconnected Impervious Surface (DIS)
0
21
Treatment Swale
0
22
Dry Pond
0
23
StormFilter
0
24
Silva Cell
0
25
Bayfilter
0
26
Filterra
0
FORMS LOADED
ESIGNER CERTIFICATION a�RSf
27 Name and Title: Robert D. Davis, P.E , Owner
28
Organization:
RDDayis En ineerin , PLLG
29
Street address:
30
City, State, Zip:
31
Phone numbers :
32
Email:
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.
Signature of Designer
Date

DRAINAGE AREAS
1
Is this a high density project?
No
2
If so, number of drainage areas/SCMs
1
3
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
AREA INFORMATION
Entire Site
4
T pe of SCM
Low Density
5
Total BUA in project (sq ft
579294 sf
6permitting)
New BUA on subdivided lots (subject to
s ft
453412 sf
7
New BUA outside of subdivided lots (subject to
permitting) (sf)
125882 sf
8
Offsite - total area (sq ft)
sf
9
Offsite BUA (sq ft
sf
10
Breakdown of new BUA outside subdivided lots:
Parking (sq ft
sf
Sidewalk (sq ft
23004 sf
Roof (sq ft
sf
Roadway s ft
102878 sf
Future (sq ft
sf
Other, please specify in the comment box
below (sq ft
11
New infiltrating permeable pavement on
subdivided lots (sq ft
sf
12
New infiltrating permeable pavement outside of
subdivided lots (sq ft
sf
13permitting)
Exisitng BUA that will remain (not subject to
s ft
sf
14
1 Existina BUA that is already permitted (sq ft
sf
15
Existing BUA that will be removed (sq ft
sf
16
Percent BUA
24 0
17
IDesign storm inches
1 in
18
IDesign volume of SCM cu ft
19
lCalculation method for design volume
ADDITIONAL INFORMATION
20
Please use this space to provide any additional information about the
drainage area(s):

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.