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SuDS pond bank stabilisation

SuDS ponds stabilisation and vegetation establishment

Reducing erosion and sedimentation during the construction of a housing estate.

 

The area which required stabilisation was the SuDS pond which will take runoff water from the newly built estate.
Sustainable urban Drainage Systems (SuDS) are an important water runoff management system in all new housing developments.

We were brought in to stabilise the bare soils around and within the balancing ponds at the SuDS on a housing development in Sussex.
The main objective is to minimise and trap soil from being displaced by rain impact and then transported within the surface water flow, off site and into streams and a lower lake.

The solution included:

  • Initial stabilisation, using biodegradable rolled erosion-controlled blankets, this was a combination of fully biodegradable matting and wooden pegs
  • Creation of a sump within the pond to trap sediment by building a retaining features using coir rolls and biodegradable net
  • Once the conditions allowed the bank sides were hydroseeded through and over the biodegradable nets
  • The pond ecology was established using pre-vegetated coir rolls, providing for quick growth and immediate reduction in the erosive potential of the water entering the system

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
  • Ease of working with other contractors
  • Completed quickly

Need help with a similar project?

Stabilisation of banks using coir netting Once the conditions allowed the bank sides were hydroseeded through and over the biodegradable nets The pond ecology was established using prevegated coir rolls, providing for quick growth and immediate reduction in the erosive potential of the water entering the system 12 months later the vegetation is well established both within the pond and along the banksides providing a haven for wildlife
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The pond ecology was established using prevegated coir rolls, providing for quick growth and immediate reduction in the erosive potential of the water entering the system

Site Problems

There were a number of challenges facing us including extreme slopes around the pond.

  • The soil was mobile and a rapid solution was needed.
  • The soil conditions were extremely poor with low organic matter.
  • The pond was actively accepting ground water.

Solution

We provided a comprehensive solution:

Our approach was to stabilise the soil using natural materials, that will biodegrade into the site.

We used fast growing seed species with a net forming root structure. The soils were anchored using biodegradable blankets which provide shelter for the germinating seeds and will break down adding organic matter to the soils over time.

Sussex

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