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New York State Verified Proprietary Stormwater Management Practices

(Release Date May 2007)

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.

Evaluation of proprietary systems for demonstration of removal efficiency for redevelopment application are performed based on one of the existing stormwater management practice evaluation systems, such as the U.S. Environmental Protection Agency (EPA) Environmental Technology Verification Program, the State of Washington Technology Assessment Protocol - Ecology (TAPE), the Technology Acceptance Reciprocity Partnership Protocol (TARP) - (PDF, 800 KB), and New Jersey Corporation for Advance Technology (NJCAT).

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 Application Source Design Method Outside Links for Sizing Method (source, product)
AquaShield Aqua Shield Aqua-Swirl Concentrator Hyd. Dyn. P TARP, WADOE Flow through NJCAT, Aqua Shield Aqua-Swirl Concentrator - (PDF, 159 KB )
AquaShield Aqua Shield Aqua-Filter Concentrator Filtering P, R TARP, WADOE Flow through NJCAT, Aqua Shield Aqua-Filter Concentrator - (PDF, 159 KB)
Baysaver BaySaver Stormwater Separation Systems Hyd. Dyn. P, R TARP, USEPA, ETV Flow through NJCAT, BaySaver Stormwater Separation Systems - (PDF, 103 KB)
CDS Technologies High Efficiency CDS System Hyd. Dyn P, R TARP Flow through NJCAT, High Efficiency CDS System - (PDF, 140 KB)
CDS Technologies CDS Media Filtration System Filtering P, R TARP Flow through NJCAT, CDS Media Filtration System - (PDF, 243 KB)
Contech Stormwater Solutions Vortechs Hydrodynamic Separator Hyd. Dyn. P, R TARP, USEPA, ETV Flow through NJCAT, Vortechs Hydrodynamic Separator - (PDF, 80 KB)
Contech Stormwater Solutions VortSentry Hydrodynamic Separator Hyd. Dyn. P TARP Flow through NJCAT, VortSentry Hydrodynamic Separator - (PDF, 118 KB)
Contech Stormwater Solutions VortFilter Filtering R TARP, ETV Flow through NJCAT, VortFilter - (PDF, 115 KB)
Contech Stormwater Solutions StormFilter (Perlite Media) Filtering R WADOE, TARP, ETV Flow through NJCAT, StormFilter - (PDF, 107 KB)
Contech Stormwater Solutions StormVault Wet Vault P TARP Strg/Detention NJCAT, StormVault
Contech Stormwater Solutions StormFilter (ZPG media) Filtering T, R ETV Flow through ETV, StormFilter (ZPG media) - (PDF, 157 KB)
Crystal Stream Technologies Crystal Stream Water Quality Vault Wet Vault P, R ETV Flow through USEPA, ETV Program Crystal Stream Water Quality Vault - (PDF, 1.18 MB)
Hancor Stormwater Quality Unit Module II Wet Vault P WADOE Strg/Detention WSDOE, TAPE Stormwater Quality Unit Module II - (PDF, 40 KB)
Hydro International Downstream Defender Hyd. Dyn P, R TARP, WADOE Flow through NJCAT, Downstream Defender - (PDF, 184 KB)
Rinker Stormceptor Stormceptor Hyd. Dyn P, R TARP Flow through NJCAT, Stormceptor - (PDF, 112 KB)
WSDOT Ecology Embankment (Chapter 5) Filtering T WADOE Filt./Infilt. WADOE, Ecology Embankment (Chapter 5) - (PDF, 162 KB )

Hyd. Dyn. = Hydro Dynamic Systems

Strg = Storage System

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Table 2.a. Hydrodynamic Practices Verification Summary
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
Downstream Defender 4-FT 4.0 3.0 1.2 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
VortSentry VS40 4.0 1.8 1.1 60 8 - 420 µm d50 120 µm 69


Table 2.b. Wet Vaults Verification Summary
Description Tested Model Dimensions (ft) Marketed Capacity (cfs) Treatment Capacity (cfs) Verified Design (%) Particle Size Distribution TSS Removal (%)
Crystal Stream Water Quality Vault 1056 10' L, 5' W, 6' H 17.5 3.5 25 -- * 89**
StormVault Mitigation System (Contech) SV68X2 17.5' L, 8' W, 3' H -- *** -- *** -- *** -- * 77
Stormwater Quality Unit Module II (Hancor) SWQU-II 4' - 5' dia, 20.5' length 0 - 2.4 0.9 - 1.1 38 - 46 -- * 80

* Verification by varied particle gradation (field/lab)

** Efficiency based on Suspended Sediment Concentration (corresponding to 21% removal of total suspended solids)

*** Sizing of the capture volume for six-hour drain down time.

Table 2.c. Media Filters Verification Summary
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 inch Cartridge coarse perlite 17.5 gpm / cartridge 2 gpm/ft 2 Yes 22 µm 80 -
Aqua Shield Aqua-Filter Concentrator Single Cartridge, coarse Perlite 20 gpm 20 gpm Yes 22 µm 80 -
WSDOT Ecology Embankment Mix media bed (pea gravel, dolomite, gypsum, & perlite) Design infiltration rate of 14 inches per hour Designed as infiltration or filtering system (under drain pipe) Yes - 90 74