Keeping local waterways clean
Improving local waterways is part of the Southern Corridor Improvements Project.
Motorists heading south may have noticed the new wetland area after passing under Orams Road Bridge. Designed to create a low maintenance and more environmentally friendly motorway, these wetland areas capture and filter stormwater run-off from the motorway lanes.
The wetlands are not alone when it comes to new systems to look after the environment. Swales are also used, which are planted areas to filter out dirt and contaminants from the water before it makes its way into the stormwater system and local waterways. Planting within these wetlands and swales promotes ecological value, as well as improving the water quality.
Specific native plants, suitable for damp areas, are used including Apodasmia Similis (Oioi), Cyerus ustulatus (Toetoe), Carex lessonianan (Rautahi), Ficinia nodose (Wiwi) and Cordyline australis (Ti Kouka). The planted areas alongside the motorway may look a little bare now, however they will grow to enhance the green motorway corridor, providing a natural habitat for insects and wildlife.