Dr roger wade environment agency
1 / 12

- PowerPoint PPT Presentation

  • Uploaded on

Dr Roger Wade Environment Agency. Severn Tidal Impoundments Environmental Unknowns. The role of the Environment Agency. Regulator Operator Advisor. Hydraulics and Geomorphology. Erode or Deposit? The impact on Flood Defence. – May have some benefit but other impacts.

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
Download Presentation

PowerPoint Slideshow about '' - Jimmy

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Dr roger wade environment agency l.jpg

Dr Roger WadeEnvironment Agency

Severn Tidal Impoundments

Environmental Unknowns

The role of the environment agency l.jpg
The role of the Environment Agency

  • Regulator

  • Operator

  • Advisor

Hydraulics and geomorphology l.jpg

Hydraulics and Geomorphology

Erode or Deposit? The impact on Flood Defence. – May have some benefit but other impacts.

Slide4 l.jpg

Climate change impacts


coastal development

channel morphology




natural habitats


Water quality and quantity l.jpg

Water Quality and Quantity

Water Quality

Algal activity –( eutrophication). Could be added cost

Water Resources

– future availability? May be improved.

Fish and habitats directive l.jpg
Fish and habitats directive.

  • The estuary is an important nursery area for fish

  • Over 100 species are found

  • Some species are protected by the Habitats Directive

  • Over 25% of the salmon in England and Wales spawn in the rivers affected

  • Twaite Shad spawn in 4 rivers in the UK- 3 of which are upstream of the Cardiff Weston Barrage.

  • Compensation for any loss may not be possible.

  • We do know turbines kill fish.

Proposed turbine design a 7m diameter straflo turbine l.jpg
Proposed turbine designa 7m diameter “Straflo” turbine

9 OR 10m proposed for Severn.

AT 60 rpm


Turbine mortality l.jpg
turbine mortality

(source STPG, from SDC Report 2007).

Salmon - adults = 40%

- smolts = 10%

Eels adult = 28%

Shad juvenile = 53%

European eel anguilla anguilla l.jpg
EUROPEAN EEL – Anguilla anguilla

European Eels in decline and now protected by Eel Regulations. Valuable commercial net fishery for elvers

Long lifetime (up to 30 years ) makes prediction of impact very difficult

Annapolis bay of funday 0 2 energy of cardiff weston l.jpg
Annapolis (Bay of Funday)- 0.2 % energy of Cardiff – Weston.

The environment l.jpg
The Environment

  • Messages from the Bay of Fundy-Eric Van Walsum

  • “Environmental Issues need to be part of the Design”

Conclusions l.jpg

  • The last 30 years – knowledge gaps

  • Unknowns and risk

  • The Challenge! Can we find an option to produce energy and not respect the environment?