TerrAffix

Hydroseeding through Erosion Blankets

Naturalisation of Flood Remediation Banks For Scour Protection & Bank Stabilisation

A solution for Hydroseeding through reinforced matting.

TerrAffix were asked to provide a solution for the vegetation of flood defence bunds and channel sides following the laying of 30,000m2 of reinforced coir blanket incorporating a double plastic net to prevent scouring.

The Erosion Control Blankets were laid to address poor soil stability on the site. The main aim of the client was to prevent scour and promote biodiversity and ecological resilience.

Further to an ecological survey we identified the most appropriate mixture of species, including, grasses and herbs appropriate for the ground conditions evident on-site.

The main areas of focus were

  • Preventing scour
  • Low organic matter
  • Poor soil stability
  • Erosion
  • Hydroseeding over Erosion Control Blankets

There were significant benefits to the client

  • Significant carbon saving
  • Financial savings
  • Quick application
  • Rapid vegetation establishment
  • Root stability in 6 months
  • No top soil brought on site, reducing risk and cost

 

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Embankment prior to treatment Embankment following treatment with additional landscape tree planting Vegetated steep embankments
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Prior to spraying

Site Problems

Challenges

The particular circumstances meant the erosion matting was laid prior to spraying. This required a tailored approach to ensure vegetation establishment.

The slopes were inaccessible to vehicles, meaning we were working on extreme distances up to 200m from the hydroseeder. This required us to use multiple hose lengths to ensure good seed coverage throughout the entire site. Work started in winter in wet conditions.

 

30,000 m2

Solution

We provided a two stage solution:

We started with the identification of appropriate seed mix for above and below to ensure biodiversity needs as well as root anchoring needs were met.
i) We created a bespoke treatment to improve efficacy to enable the mix to flow and disperse through the blanket. We increased organic matter within and beneath the blanket.
ii) We oversprayed the blankets using our specialist HydraMulch, additives and plant based tackifiers to ensure rapid rain-resistant stabilisation of the surface.

South East England

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