Geocellular Systems in Stormwater Management

Martin Lambley Wavin UKMark Goodger Hydro International

3rd August 2016

• The leading trade federation of the UK plastics industry

• Forum for exchange of technical expertise and experience

• Coordinates response to specific industry issues and focal point for communication

• Informs and influences standards

British Plastics Federation Pipes Group

August 2016

• Active in development of new European standards for geocellular systems• Product standard for geocellular elements (box)

• Short term test standard

• Long term test standard

• Contributors in projects to produce regulatory and best practice guidance.

Systems for storm water handling

August 2016

• Modular plastic units with high porosity – typically around 95%

• Used to create below ground structures for the temporary storage of stormwater before controlled release (or re-use)

• Sit within the EA SuDS hierarchy for flood reduction• Not new – been in use since 1987

Geocellular Systems

August 2016

Geocellular Systems

August 2016

Geocellular Systems

Modular tanks have two basic components• The ‘structural frame’

provides stiffness and strength through the geocell unit

• The ‘skin’ keeps out soil and backfill and is delivered through a geomembrane or geotextile

August 2016

Typical Construction

Extracted from CIRIA C753 – The SuDS Manual 2015

August 2016

Herne Hill and Dulwich Flood Alleviation Scheme, Southwark

Case Study

August 2016

Case Study: Herne Hill & Dulwich Flood Alleviation Scheme, Southwark

Source: EA Surface Water Flood Maps2004 flooding in Turney Road.

Source: Alastair Macdonald, resident (via WaterProjectsOnline)

August 2016

Source: Southwark Council, Dulwich Park Proposals Plan

August 2016

Case Study: Herne Hill & Dulwich Flood Alleviation Scheme, Southwark

August 2016

The End

August 2016