The Problem

The aftermath of Cyclone Gabrielle left State Highway 2 with extensive slips, posing a significant threat to public safety and disrupting crucial transportation routes. The slips were not only a hazard for motorists but also had environmental implications, with the potential for soil erosion and runoff.

Scope

The affected area encompassed 30 hectares along State Highway 2, requiring a comprehensive solution to stabilize the slips and initiate effective revegetation. The magnitude of the damage called for a solution that could address both the immediate safety concerns and the long-term environmental impact.

Our Solution

Hydro Mulch

• With New Zealand wooden fibre and Site Loc Polymer. Application rate 2,500kg/ha. To provide stabilisation while the grass germinated and vegetation succession underway.

 
Seed blend used was our Erosion Control seed blend. Deep rooted species that thrive in poor quality soils. 12 months after application some species can have a root structure up to 30cm deep!

Challenges

Several challenges were encountered during the Hydromulching process. The steep terrain, unpredictable weather conditions, and the need to work within a tight timeframe presented logistical challenges. And ensuring minimal disruption to traffic added additional layers of complexity to the project.

Results

The site showed no signs of sediment movement, erosion, riling or anything. Instead, we had achieved nearly 100% grass strike and the slip was fully stabilised, vegetation succession underway!