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Severn Estuary Forum Flood Risk and the Severn Barrage 19 th September 2009. Nick Lyness Wessex Flood &Coast Erosion Risk Manager. Climate change impacts. drainage. coastal development. channel morphology. UPSTREAM. DOWNSTREAM. defences. habitat. de-commissioning.

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severn estuary forum flood risk and the severn barrage 19 th september 2009
Severn Estuary ForumFlood Risk and the Severn Barrage19th September 2009

Nick Lyness

Wessex Flood &Coast Erosion Risk Manager

slide2

Climate change impacts

drainage

coastal development

channel morphology

UPSTREAM

DOWNSTREAM

defences

habitat

de-commissioning

flood defence issues

Flood Defence issues

A barrage should decrease overall flood risk from storm surges, but……

Existing defences, and new strategies, will manage the flooding impacts of climate change without a barrage.

SDC report recognises that flood risk is an emotive subject, but it is not a show stopper or promoter.

slide6

Tidal flap valve at Windmill Reen, Redwick

Blackwall West Reen, Magor

Seawall near Goldcliff Point

flood defence issues7

Flood Defence issues

A barrage should decrease overall flood risk from storm surges, but……

~ 100 drainage schemes will need upgrading.

Up to £60m to sort the pumping stations and tidal outfalls

Thousands of people are protected by defence systems

de commissioning

De-commissioning

Effective life of the barrier

100 yrs? 200 yrs?

For the foreseeable ever?

Higher seas, bigger seas - how effective is it?

Climate change impacts?

Coastal development behind the barrier - depending on barrier

Who maintains the “defence”?

our view

Our view

Nature and scale of barrage proposals would cause irreversible impacts to features, species and habitats.

Direct impact on Severn Estuary Special Protection Area (SPA), proposed Special Area of Conservation (pSAC) etc.

Difficult to envisage how required compensatory habitats could be provided to replace those that would be lost.

The case for a barrage needs to take account of other renewable options which might give similar benefits, at lower financial and environmental cost.

shad facts
Shad Facts
  • No breeding populations of Allis shad known in UK
  • Only 4 sustainable breeding populations of Twaite shad known in UK AND 3 are in the Usk, Wye & Severn

(the 4th is in Tywi)

  • All are SAC Listed
our view15

Our view

Major environmental impacts due to the vast amounts of materials required.

Discharge consents / permits would need reviewing.

Substantial ancillary and infrastructure development including the need to modify or build new port facilities.

Lots of work to understand how the proposal would fit with the requirements of the Water Framework Directive.

A major programme of predictive environmental studies will be needed, which could take several years to complete.

thank you
Nick Lyness

Wessex Flood &Coast Erosion Manager

Thank you