The TNS™ integrates proprietary modular tank, structural cell and drainage void systems – arranged like Tetris beneath the street. Each variant is the same source-control principle, configured to a different depth, capacity and site type.
The variants differ in what sits above ground and how much storage sits below. The build standard beneath them does not change.
Every node is fed by a minimum of one EnviroKerb™ High Flow Inlet and one EnviroKerb Tray Inlet. Node inflow determines how many more are added along the kerb run.
Every TNS™ is instrumented. Matter sensors report flow, moisture and system state against a calibrated baseline, so performance is measured rather than assumed.
All modular cells and tank components are wrapped in geotextile. On drainage cells and tanks it keeps fines and soil out; on structural soil cells it holds biofiltration media and root mass in.
Every node is surrounded in porous backfill media – drainage stone or sand – so water moves freely into and through the structure rather than perching against it.
Relief pipes are implemented as standard across TNS™ nodes, giving the system a controlled outlet once storage is satisfied.
Tank and drainage-cell volume is set by the calculated inflow for each microcatchment, not by a fixed product size. Cutaway images show indicative arrangements only.
Modular tank and cell components are brand-agnostic – any compliant modular system can be adopted to suit supply, depth and load requirements.
The full expression of the system: a healthy street tree growing over a structural soil cell and tank module, fed by the EnviroKerb™ and ETI. Where conventional drainage pipes water past the tree, the Tree Pit System routes it into the root zone – so the canopy is passively watered on every rain event while runoff is retained at the source.
For grassed verges and landscaped medians, the Nature Strip variant turns the everyday strip between kerb and footpath into working green infrastructure. The EnviroKerb™ and a water ramp unit feed a tank module and drainage cell beneath the turf, holding moisture in the profile so the strip stays green and the runoff stays out of the pipe.
Where the priority is retention volume and flood mitigation, the Storm Retention variant puts the storage to work beneath the pavement. The EnviroKerb™ and ETI feed a water ramp unit, drainage cells and tank module sized to detain and slowly release flow – reducing peak discharge to the network and recharging groundwater below.
Storm Retention — Planted pairs an amenity planted surface with high-capacity modular storage below. The planted surface sits over geotextile-wrapped drainage cells and tank modules, combining the amenity and canopy of a planted bed with the retention volume of modular storage – a complete source-control system in one footprint. Storage depth and volume are set by the calculated inflow for the catchment; the cutaway shows an indicative half-height arrangement.
Tell us the street, the constraints and the outcome you're after – we'll map the right configuration and provide the standard details.
