How the ECO-90™ works


SuDS Tier 1 Hierarchy

The ECO-90™ is an internationally patented product with unique characteristics that solve a multitude of drainage problems. We launched it in the UK under licence in 2012, since when we have completed over 300 successful installations, including flagship commercial installs at Edgbaston Cricket Ground, Edinburgh University, Gleneagles Golf Course, Motor Point, Royal Ascot Race Course and Silverstone Racing Circuit.

Made from high density polyethylene (HDPE), standard drainage extrusion, the unique ECO-90™ design uses a multiple open chamber system (see diagram) that creates both lateral (horizontal) and vertical water transfer to soil stratas to a depth of 12 metres.


EC0-90™ Extrusion Profile, 12 metres in length

The ECO-90™ comes in lengths of up to 12 metres. It is installed vertically into a pre-drilled hole, that is 30cm deeper than the ground level. Once installed the ECO-90™ is soft-capped, preventing groundwater and pollutants from directly entering the chambers. It is not a borehole drain.

Water held in the soil surrounding the open chambers moves into them to move downward, its natural propensity. Due to the cap, the only way water can enter into the ECO-90™ chambers is laterally (horizontally), not vertically. 

For construction installations we first create a storm trench. This has a geotextile filter, Inbitex that encourages the formation of microbes that in turn degrade hydrocarbons (oils). We install ECO-90s™ below the trench to take the storm water from the trench and discharged into deeper soil stratas.

As the water enters the ECO-90™ chambers and moves to the bottom of the ECO-90™ to a depth of 12 metres, the head of water in the chambers is now exerting significant pressure at the bottom of the ECO-90™, creating a differential hydraulic head. This forces water out of the chambers into surrounding unsaturated soil stratas (see Discharge Velocity Modelling below). In addition, unsaturated soils ‘pull’ water from the saturated soils that inevitably form around the ECO-90™, creating lateral discharge.

Discharge Velocity Modelling


As water is forced out of the chambers, more water enters. Surface or storm water is now being drawn into the soil above the ECO-90™ cap because the water that used to be there has moved into the ECO-90™ chambers.

We now have surface or storm water creating more head pressure, that in turn forces water into lower soil stratas, supported by other soils lateral ‘pull’.. The result is a virtuous cycle of nuisance ground or storm water being drawn into the chambers and then being discharged into deeper unsaturated soil stratas. Essentially the ECO-90™ system has created a deep drain, utilizing soil stratas between 1 -12 metres below ground level.