Downstream Defender® Select is a hydrodynamic vortex separator made for stormwater treatment, capturing and retaining sediment, oils and floatable debris from runoff in a compact unit. Customisable chamber sizes and inlet options support a range of flow rates and pollutant removal standards.

  • Hydrodynamic separator for stormwater runoff, removing sediment, oils and floatables

  • Customisable chamber sizes and inlet configurations for site-specific drainage design

  • Accepts up to three inlet pipes and a wide range of pipe sizes for flexible installation

  • Automated maintenance alerts available with Hydro-Logic Smart Monitoring

  • Suitable for integration with Sustainable Drainage Systems (SuDS) and pre-treatment for natural features

  • Option to store hydrocarbons as solids in Advanced Vortex and Vortex Plus models

  • Reduces need for additional chambers or complex pipe connections

Applications

Treating runoff from highways, car parks and industrial areas

Pre-treatment for swales, ponds and detention basins

Retrofit in SuDS, Water Sensitive Urban Design (WSUD), LID or LEED systems

Areas requiring high solids and litter capture

Options and variations

Advanced Vortex and Vortex Plus models with hydrocarbon storage as solids

Extended range of chamber sizes

Up to three inlets per unit

Performance

Removes fine particles, floatable debris, liquid and sediment-bound hydrocarbons, heavy metals and nutrients

Mitigation indices for The SuDS Manual (CIRIA C753) Simple Index Approach (SIA) listed in technical information

Installation

Accepts a wide range of pipe sizes and up to 3 inlets

Reduces need for difficult pipe connections, couplings, or additional chambers

Maintenance

Automated alerts for emptying with Hydro-Logic Smart Monitoring

Reduced inspection visits when installed alongside roads or rail tracks