The Downstream Defender^® is an advanced hydrodynamic vortex separator that provides impressive and reliable removal of fine and coarse particles, hydrocarbons and floatable debris from surface water runoff, delivering high levels of stormwater treatment over a wide range of flow rates.

Available in a range of sizes, it can function as either pretreatment or as a stand-alone device, providing engineers and contractors with a flexible, cost-effective stormwater management option.  

Targeted Pollutants:

• Fine and coarse particles / total suspended solids (TSS)
• Floatable trash and debris
• Liquid- and sediment-bound oils and hydrocarbons
• Sediment-bound heavy metals
• Sediment-bound nutrients

Applications:  

The Downstream Defender^® reliably treats surface water runoff from impermeable surfaces including highways, car parks, industrial areas and urban developments

• As part of green infrastructure, LID or LEED systems
• Areas where high solids and trash capture are a must
• Control of silting upstream of wetlands, ponds and basins
• Industrial stormwater pollution control

Certifications & Verifications: 

• New Jersey Corporation for Advanced Technology (NJCAT) 
• New Jersey Department of Environmental Protection (NJDEP)
• Environmental Technology Verification (ETV) Canada
• Washington State Technology Assessment Protocol - Ecology (TAPE) for Pretreatment
• Virginia Department of Ecology BMP Clearinghouse
• Ohio Department of Transportation 
• St. Louis Metropolitan Sewer District
• California Water Boards Full Trash Capture
• Florida Department of Environmental Protection (Accepted)

The Downstream Defender^® stormwater treatment system is designed to enhance vortex separation by minimizing turbulence and headloss, increasing efficiency, and preventing washout of stored pollutants. 

1. Contaminated stormwater is introduced tangentially into the side of the vessel, generating a rotating flow that spirals around the outside of the dip plate.

2. Oils, trash and floatable debris rise to the water surface and are trapped in the oil and floatables storage volume.

3. As flow continues to spiral down around the dip plate cylinder, low energy vortex motion directs sediment inward along the benching skirt and into the protected sediment storage zone.

4. The benching skirt and center cone redirect the rotating flow up and inward between the center shaft and dip plate cylinder away from the stored sediment.

5. The outlet pipe discharges treated effluent from within the dip plate cylinder ensuring the longest possible residence time.