The following lists the verified
proprietary stormwater management practices (SMP) that meet the performance
criteria for redevelopment applications as defined in the New York State
Stormwater Management Design Manual (Design Manual). The New York State Department of
Environmental Conservation listing of stormwater treatment technologies is, at
this time, based on the verifications conducted by other environmental
regulatory agencies.
Types:
The following tables provide
information on three types of proprietary practices: Hydro Dynamic Systems, Wet
Vaults, and Media Filters.
No proprietary product is
identified for infiltration and or quantity control systems for redevelopment
applications because such practices are generally considered acceptable as
standard practices if designed in accordance with the standards defined in the
Design Manual. Use of manufactured
infiltration systems is considered a standard practice as long as all the
required elements and design guidance defined in the Design Manual are
followed. Use of underground storage
systems is also considered a standard practice for the purpose of detention and
attenuation to meet water quantity control requirements.
Sizing:
The Chapter 9 of the New York State
Stormwater Management Design Manual provides a general outline for design and
sizing of the verified practices. Since
sizing criteria is integral to the verified performance of manufactured
practices, designers should refer to the capacities and flow rates associated
with the models (sizes) of the manufactured SMPs identified by the verification
source. Appropriate sizing and allowable
flow rates are provided in table 1, Sizing Method, by referencing directly to
the product model sizing developed by verification source.
In addition to meeting water
quality performance goals, proprietary practices must be sized to capture and
treat the WQv resulting from the contributing drainage area.
For practices with a volume-based
sizing approach, the practice must be sized to capture and treat 75 % of the
WQv as defined in Chapter 4 of the Manual.
For flow through systems, the practice must be sized to treat the peak
rate of runoff as defined in Chapter 4 and Appendix B of this Manual. Flow through systems must be designed
off-line and the installation must include flow diversion that protects the
practice from exceeding design criteria.
Tables 2 a, b, and c summarize the
key details of the testing findings for each verified product. This information is necessary in meeting the
water quality performance identified in the verification process.
|
Keys for the application column
of this sheet: |
|
T- Practice may be used as a
standard treatment system in new and or redevelopment projects. |
|
P- Practice may be used as a
pretreatment system in new and or redevelopment projects. |
|
R- Practice may be used in
redevelopment projects. |
Table 1. Verified Proprietary
Stormwater Management Practices
|
Company |
Product |
Type |
Applica-tion |
Source |
Design
Method |
Sizing
Method |
|
Hyd. Dyn. |
P |
TARP, WA |
Flow through |
|||
|
Filtering |
P, R |
TARP, WA |
Flow through |
|||
|
Hyd. Dyn. |
P, R |
TARP, ETV |
Flow through |
|||
|
High Efficiency
CDS System |
Hyd. Dyn. |
P, R |
TARP |
Flow through |
||
|
Filtering |
P, R |
Flow through |
||||
|
Hyd. Dyn. |
P, R |
TARP, ETV |
Flow through |
|||
|
Hyd. Dyn. |
P |
TARP |
Flow through |
|||
|
Filtering |
R |
TARP, ETV |
Flow through |
|||
|
Filtering |
T, R |
WA, TARP, ETV |
Flow through |
|||
|
Wet Vault |
P |
TARP |
Strg/Detention |
|||
|
Wet Vault |
P, R |
Flow through |
||||
|
Wet Vault |
P |
Strg/Detention |
||||
|
Hyd. Dyn. |
P |
WA, TARP |
Flow through |
|||
|
Hyd. Dyn. |
P, R |
TARP |
Flow through |
|||
|
Filtering |
T |
Filt./Infilt. |
||||
|
Filtering |
T, R |
ETV |
Flow through |
|
Table 2.a. Hydrodynamic Practices Verification
Summary |
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|
Product |
Tested Model |
Diameter (ft) |
Marketed Capacity (cfs) |
Treatment Capacity (cfs) |
Verified Design (%flow rate) |
Particle Size Distribution |
TSS Removal (%) |
||||||
|
Aqua-Swirl Concentrator |
AS-3 |
3.25 |
1.8 |
0.9 |
50 |
50 - 150 µm d50 110 µm |
60 |
||||||
|
Baysaver Separator System |
1K |
2.0 |
2.4 |
1.1 |
46 |
1 - 1000 µm d50 85 µm |
51 |
||||||
|
CDS (High Efficiency) |
PMSU20_20_5 |
6.0 |
1.1 |
1.1 |
100 |
10 - 100 µm d50 63 µm |
74 |
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|
Downstream Defender |
4-FT |
4.0 |
3.0 |
1.1 |
37 |
53 - 300 µm d50 120 µm |
70 |
||||||
|
Stormceptor |
STC 900 |
6.0 |
0.6 |
0.6 |
100 |
d50 97 µm |
75 |
||||||
|
Vortechs |
2000 |
4.0 |
2.8 |
1.1 |
40 |
38 - 75 µm |
64 |
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|
VortSentry |
VS40 |
4.0 |
1.8 |
1.1 |
60 |
8 - 420 µm d50 120 µm |
69 |
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Table 2.b. Wet Vaults Verification Summary |
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|
Description |
Tested Model |
Dimensions (ft) |
Marketed Capacity (cfs) |
Treatment Capacity (cfs) |
Verified Design (%) |
Particle Size Distribution |
TSS Removal (%) |
||||||
|
|
1056 |
10' L, 5' W, 6' H |
17.5 |
3.5 |
25 |
-- * |
89 |
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|
StormVaultTM Mitigation System (Contech) |
SV68X2 |
17.5' L, 8' W, 3' H |
-- ** |
-- ** |
-- ** |
-- * |
77 |
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|
Stormwater Quality Unit Module II
(Hancor) |
SWQU-II |
4' - 5' dia, 20.5' length |
0 - 2.4 |
0.9 - 1.1 |
38 - 46 |
-- * |
80 |
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*
Verification by varied particle gradation (field/lab) |
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** Sizing
of the capture volume for six-hour drain down time. |
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Table 2.c. Media Filters Verification Summary |
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DESCRIPTION
|
Tested
Model |
Marketed
Capacity (gpm) |
Treatment
Capacity (gpm) |
Verified
Design (%flow rate) |
Particle
Size Distribution |
TSS Removal (%) |
TP Removal (%) |
|
VortFilter™ |
Cart. With a
perlite media |
15 gpm / cartridge |
15 gpm / cartridge |
Yes |
22 - 32 µm |
80 |
- |
|
StormFilter |
Single Cart, coarse Perlite |
15 gpm / cartridge |
15 gpm / cartridge |
Yes |
65 µm |
79 |
- |
|
StormFilter |
Single Cartridge, ZPG™ media |
7.5 gpm / cartridge |
7.5 gpm / cartridge |
Yes |
22 µm |
87 |
38 |
|
CDS
filter |
22" Cartridge coars perlite |
17.5 gpm/ cartridge |
2 gpm/ft2 |
Yes |
22 µm |
80 |
- |
|
Aqua
Shield Aqua-Filter Concentrator |
Single Cartridge, coarse Perlite |
20 gpm |
20 gpm |
Yes |
22 µm |
80 |
- |
|
WSDOT Ecology
Embankement |
Mix media bed (pea gravel, dolomite,
gypsum, & perlite) |
Design infiltration rate of 14
inches per hour. |
Designed as infiltration or
filtering system (underdrain pipe) |
Yes |
- |
90 |
74 |