Capture and retain sediment, oils and floatables from stormwater runoff over a wide range of flows in a small footprint.
Downstream Defender® is an advanced hydrodynamic vortex separator that provides impressive and reliable removals of sediments, oil and floatables from stormwater runoff.
The Downstream Defender® offers long maintenance intervals and consolidates pollutant removal to a single point in the drainage system.
The Downstream Defender® is an advanced hydrodynamic vortex separator that provides impressive and reliable removals of fine and coarse particles, hydrocarbons and floatable debris from stormwater runoff, delivering high levels of treatment over a wide range of flow rates.
The Downstream Defender® is one of the Hydro StormTrain® Series of stormwater treatment systems which can be used independently or as part of a surface water treatment train.
Available in a range of sizes, it can function as either pretreatment or as a standalone device. The Downstream Defender® has large storage volumes for pollutants captured from stormwater runoff whilst also offering protection to watercourses from accidental spills of oil/light liquids.
The Downstream Defender® has been independently tested, verified and approved.
The Downstream Defender® reliably treats runoff from any impermeable surfaces including highways, car parks and industrial areas:
The Downstream Defender® delivers high removal of pollutants across a wide range of flows in a much smaller footprint than conventional or other swirl-type devices. A smaller footprint means an easier install that's less expensive and less work.
The Downstream Defender® is proven to prevent wash out of captured pollutants. Carefully designed internal components isolate the pollution storage areas ensuring what is captured is retained, even during high flows.
The Downstream Defender® can accommodate a change in outlet pipe direction to suit site specific requirements, helping meet Building Regulations without the need to construct a second manhole.
Low headloss means more site flexibility and provides the option for a shallower site.
Treatment flow rate - Fine: 30-190 l/s
Treatment flow rate - Coarse: 38-237 l/s
Hydraulic capacity: 120-750 l/s
Oil storage capacity: 270-4,550 l
Sediment storage capacity: 0.38-3.81 m3
Maximum Headloss at Treatment Flow Rate - Coarse: 150 - 375 mm