As a result of the vegetation loss on the slopes, the ﬁre exposed highly erodible loess soils as well as a signiﬁcant amount of ash. The sensitive receiving catchment was subjected to a signiﬁcant risk as well as an increased sediment loading during autumn rain events washing into the Cashmere Stream and subsequently into the Avon/Heathcote Estuary.
Vital Bon-Matt Stonewall (IGD) was chosen, based on its proven stabilisation properties, for applications to speciﬁc areas to provide immediate point source stabilisation of exposed & ﬁre damaged slopes. Vital Bon-Matt Stonewall (IGD) applications were also undertaken to support the establishment of aerial seeding where specialist seed blends were used to promote revegetation by pinning seed to soil.
The employment of Vital Bon-Matt Stonewall (IGD) over 8ha immediately and effectively stabilised at risk areas on the Port Hills. Further, the product employment improved sustainable environmental outcomes by minimising erosion and consequently leading to a reduction in loss of soil and loess. This in turn resulted in reducing the sediment load entering sensitive waterways and promoting long-term stabilisation and revegetation.
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