Overview

Overview

The Downstream Defender® Select separator is the new generation of hydrodynamic vortex separator for treatment of stormwater runoff to protect the environment and meet water quality requirements. Its customisable performance and an extended range of chamber sizes allows engineers to tailor their drainage designs to meet specific pollutant removal standards.

The Downstream Defender® Select can accept a range of inlet pipe sizes and up to three inlets, removing the need for difficult pipe connections, couplings or additional chambers.

Maintenance can be optimised and inspection visits reduced by adding Hydro-Logic® Smart Monitoring, which will generate automated alerts when the units requires emptying.

Watch the video overview of the new Downstream Defender® Select.

Targeted Pollutants

  • Fine particles
  • Floatable debris
  • Liquid and sediment bound hydrocarbons
  • Sediment bound heavy metals
  • Sediment bound nutrients

Applications

The Downstream Defender® Select reliably treats runoff from any impermeable surfaces

  • Highways
  • Car parks
  • Industrial areas
  • Pre-treatment for natural features such as swales, ponds and detention basins.
  • For use with other natural Sustainable Drainage Systems (SuDS) treatment to meet required performance standards.
  • Retrofit
  • As part of SuDS, Water Sensitive Urban Design (WSUD), LID or LEED systems.
  • Areas where high solids and trash/litter capture are a must.

Designed for

Coarse particles
Fine particles
Metals
Oils & hydrocarbons
Trash & floatables
Benefits

Benefits

Customise performance to suit site stormwater quality objectives

Engineers can meet stormwater quality objectives with customisable performance and the ability to work alongside other treatment solutions such as ponds, swales and constructed wetlands.

Cut costs with more specific sizing for performance

The Downstream Defender® Select is offered in an extended range of chamber sizes helping engineers match flow rates and removal rates more cost-effectively.

Save money with improved connectivity

The Downstream Defender® Select can accept up to three inlets and a wider range of connecting pipe sizes, helping to make design and installation on site easier and cheaper.

Downstream Defender Select - multiple inlet example

Reduce maintenance costs by adding automated maintenance alerts

The addition of Hydro-Logic® Smart Monitoring will deliver automated maintenance alerts, helping to ensure that maintenance is carried out and is cost-effective. This can help with SuDS maintenance plans and also lessen risk and costs by reducing the need for inspection visits for units installed alongside roads or rail tracks.

Hydro-Logic Smart Maintenance for Downstream Defender Select

Ensure retention of hydrocarbons, even at very high flow rates

The option of storing oils/hydrocarbons as solids can be added as an option, providing increased retention, even at very high flow rates.

Note: This option is available for the Advanced Vortex and Vortex Plus models only.

Reduce the need for heavy plant

The Downstream Defender® Select is available in a plastic chamber, ideal for sites where access for heavy plant may be restricted or where fast installation is required.

How it works

How it works

 

  1. Stormwater is introduced into the side of the chamber via the inlet chute, generating a rotating flow.
  2. Oils litter and floatable debris rise to the water surface and are retained in the floatables storage volume. If the enhanced oil retention option is used, specialist media absorbs and retains oils/hydrocarbons, preventing washout. 
  3. As the flow continues to spiral down the chamber, low energy vortex motion directs sediment inward along the benching skirt and into the protected sediment storage zone.
  4. The flow then rotates back up the chamber and is discharged via the outlet hood.

 

Downstream Defender Select flow path image

Technical information

Technical information

The patented internals of the Downstream Defender® Select provide drainage design engineers with the ability to customise the performance to meet specific water quality objectives, such as the Simple Index Approach (SIA).  Engineers can select from three models, depending on the level of treatment required.

Advanced Vortex

Downstream Defender Select - Advanced Vortex

Our recommended model which provides sediments, litter and oil removal with enhanced sediment retention up to four times the treatment flow rate.

Key performance

  • Coarse and fine sediments, retained up to 4 times the treatment flow rate.
  • Litter, debris
  • Liquid hydrocarbons (oils), plus option for enhanced retention.
  • Sediment bound metals

 Vortex Plus

Downstream Defender Select - Vortex Plus

Provides sediments, litter and hydrocarbon removal, with sediments retained at up to two times the treatment flow rate.

Key performance

  • Coarse and fine sediments, retained up to 2 times the treatment flow rate.
  • Litter, debris
  • Liquid hydrocarbons (oils), plus option for enhanced retention.
  • Sediment bound metals

 Vortex

Downstream Defender Select - Vortex

A simpler model providing removal of sediments, with retention up to two times the treatment flow rate.

Key performance

  • Coarse and fine sediments, retained up to 2 times the treatment flow rate.
  • Sediment bound metals

> Design your Downstream Defender® Select- try the Online Design Tool at hydro-int.design

Chamber sizes

  • 1.0 m
  • 1.2 m
  • 1.5 m
  • 1.8 m
  • 2.1 m
  • 2.4 m
  • 3.0 m

 Pipe Sizes

The Downstream Defender® Select can accept a range of pipe sizes to enable easier and more cost-effective installation.

Inlets

For difficult or complex site arrangements and to remove the need for additional chambers, the Downstream Defender® Select can accept up to three inlets or specially locate the inlet through a 270° range.

Material Options

For flexibility of delivery and installation The Downstream Defender® Select is available in either a concrete or plastic chamber.

Improve hydrocarbon retention

The option of storing hydrocarbons (oils) as solids can be added, providing increased retention, even at flow rates where the unit is bypassing.

This option is available for the Advanced Vortex and Vortex Plus models only.


Add Hydro-Logic® Smart Maintenance

To help with SuDS maintenance plans and to ensure that maintenance is cost-effective, add Hydro-Logic® Smart Maintenance to any model and get automated maintenance alerts.

Hydro-Logic® Smart Maintenance can also reduce risk and save costs by reducing the need for inspection visits for units installed alongside roads or railtracks.

 > Design your Downstream Defender® Select- try the Online Design Tool at hydro-int.design

Resources

Resources

Case Studies

Case Studies

FAQs

FAQs