Presentation on theme: "Welcome Demonstration of the Self Erecting, Low Cost Flood Barrier The ‘SELOC’ Flood Barrier John Greenwood Reader in Geotechnical Engineering School of."— Presentation transcript:
Welcome Demonstration of the Self Erecting, Low Cost Flood Barrier The ‘SELOC’ Flood Barrier John Greenwood Reader in Geotechnical Engineering School of Architecture, Design and the Built Environment Nottingham Trent University Peter Atchison Director PAGeotechnical Ltd, Corby Steve Corbet Technical Director Aecom Group (Faber Maunsell Ltd) Project team:
Current approaches to Flood Defence Permanent walls hold back the floods but we lose the river views (Nottingham in old photographs 1944-1974, Douglas Whitworth 1991)
Current flood defence systems Ironbridge flooding Demountable barrier Demountable barrier, Shrewsbury (Ref. Environment Agency – Stokes and May 2004) ICE Tilt Dam
A low cost, self erecting flood barrier. The idea:- Cover Protective slab tie Geomembrane Backfilled trench Float Flood waters
The flood and wave barrier – construction sequence Site selection and investigation
Trench planned d =width =depth =height of protection d d d
Design of the self erecting barrier as a retaining structure (Student exercises) Total vertical pressure d d d Effective vertical pressure Effective horizontal pressure Water Press. Effect. vert. press. Effect. horiz. press. Total vert. press. Water pressure d( b - w ) 2d w d w +d b K a d( b - w ) 2d w d( b - w ) dwdw dbdb K p d( b - w ) dwdw B caca W E D C A P w3 PaPa wl PpPp P w6 P w5 P w4 P w1 P w2 wl ‘ACTIVE’ FORCES GRAVITY FORCES ‘PASSIVE’ FORCES BUOYANCY FORCES
Consideration of flows beneath the barrier E D A B C Flow line h = d Impermeable boundary Equipotential If k=10 -5 m/sec, under head, d= 0.9m, Flow q= 14 litres/hr per m run. Trench depth may be increased in very permeable ground
Self erecting barrier used to increase effective height of existing (or new) flood embankment Membrane may be extended below embankment to intercept groundwater flows in more permeable strata
Basic Design – possible use of decking as Barrier covers
Flood protection where cost or visual intrusion precludes conventional flood defences Low cost alternative to demountable barriers Increase the effective height of existing or new flood banks (No additional fill or loading) Secondary protection of local areas for ‘at risk’ cities such as Hamburg or New Orleans Temporary water storage Low cost protection of low lying agricultural land Protection around ‘hazardous’ storage tanks Control of drainage – Diverting flood waters to safe storage areas Help resist tsunami wave forces Applications
SELOC Flood Barrier – Advantages Control of (flood) waters at low cost ‘Low tech’ site construction – re-use of on-site materials Self erecting (no dependence on mobilised manpower) Preserves waterside landscape Membrane intercepts and reduces groundwater seepage Full professional technical support. Each ‘at risk’ site carefully assessed by Consulting Engineers (AECOM) and SELOC applied only if it is the appropriate solution. Can be designed to suit scale of flood protection (200 – 1000mm+) and protective surfacing provided to suit the location (walkway/driveway etc,) Varied applications - (Flood protection, water storage, tsunami protection etc.) European Patent ‘Working Together’ Engineering in Harmony with the Environment!
Thank you for your interest today The project team is grateful to the Environment Agency (Harvey Twivey) for making the site and pumping facilities available for the trials at Lea Marston. The financial support under the ‘EMDA’ Innovation Fellowship Scheme is acknowledged with thanks. We appreciate the support of our organisations and in particular the site help and project input provided by: NTU – Anton Ianakiev, Steve Goodman, Alan Chambers, Mark Flanagan AECOM – Pete Jones (Site trial coordination), Dave Cartwright PAGeotechnical – David Plumtree, Neil Salvedge Rototek – Stuart Wright. John.email@example.com Peter@pageo.co.ukPeter@pageo.co.uk (Peter Atchison) Steve.Corbet@aecom.com
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