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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.

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dr roger wade environment agency

Dr Roger WadeEnvironment Agency

Severn Tidal Impoundments

Environmental Unknowns

the role of the environment agency
The role of the Environment Agency
  • Regulator
  • Operator
  • Advisor
hydraulics and geomorphology

Hydraulics and Geomorphology

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


Climate change impacts


coastal development

channel morphology




natural habitats


water quality and quantity

Water Quality and Quantity

Water Quality

Algal activity –( eutrophication). Could be added cost

Water Resources

– future availability? May be improved.

fish and habitats directive
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
Proposed turbine designa 7m diameter “Straflo” turbine

9 OR 10m proposed for Severn.

AT 60 rpm


turbine mortality
turbine mortality

(source STPG, from SDC Report 2007).

Salmon - adults = 40%

- smolts = 10%

Eels adult = 28%

Shad juvenile = 53%

european eel anguilla anguilla
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

the environment
The Environment
  • Messages from the Bay of Fundy-Eric Van Walsum
  • “Environmental Issues need to be part of the Design”
  • The last 30 years – knowledge gaps
  • Unknowns and risk
  • The Challenge! Can we find an option to produce energy and not respect the environment?