SW5190701_Form (Supp.EZ)_20210106

FILTERRA BIORETENTION
1
Drainage area number
#3 (ST-3 in calcs)
2
Design volume of SCM (cu ft)
N/A
GENERAL
MDC FROM 02H .1050
Is the SCM sized to treat the SW from all surfaces at
build -out? Yes,
Is the SCM located away from contaminated soils? Yes
3
4
5
What are the side slopes of the SCM (H:V)?
n/a
6
Does the SCM have retaining walls, gabion walls or
other engineered side slopes?
Ne
7
Are the inlets, outlets, and receiving stream protected
from erosion (10-year storm)?
8
Is there an overflow or bypass for inflow volume in
excess of the design volume?
Yes
9
What is the method for dewatering the SCM for
maintenance?
Drawdown Orifice
10
If applicable, will the SCM be cleaned out after
construction?
No
11
Does the maintenance access comply with General
MDC (8)?
yes
12
Does the drainage easement comply with General
MDC (9)?
yes
13
If the SCM is on a single family lot, does (will?) the plat
comply with General MDC (10)?
14
Is there an O&M Agreement that complies with General
MDC (11).
Yes
15
Is there an O&M Plan that complies with General MDC
(12)?
yes
16
Does the SCM follow the device specific MDC?
Yes
17
Was the SCM designed by an NC licensed
professional?
Yes
FILTERRA BIORETENTION MDC FROM THE STORMWATER DESIGN MANUAL
18
Type of pretreatment that will be used
N/A
19
Depth of storage above the filter media surface (in)
Surface area of the Filterra Bioretention system (sq ft)
per Filterra
20
91-of
21
Method of flow distribution over the media
sheet
22
Infiltration rate of engineered media (inch/hour)
140 in/hr
23
Diameter of the underdrain pipes (if applicable)
6 in
24
Does the design include Internal Water Storage (IWS)?
No
25
if so, elevation of the top of the IWS (fmsl)
26
Elevation of the planting surface (fmsl)
Throat at 107.57
27
Species of tree(s) that will be planted
per Filterra
28
Media depth (inches)
21 in
29
Number of clean out pipes
2
30
Will maintenance be performed per the Filterra O & M
Manual?
Yes
ADDITIONAL INFORMATION
31
Please use this space to provide any additional
information about the Filterra Unit(s):
60 sf