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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 l.jpg

Dr Roger WadeEnvironment Agency

Severn Tidal Impoundments

Environmental Unknowns


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The role of the Environment Agency

  • Regulator

  • Operator

  • Advisor


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Hydraulics and Geomorphology

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


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Climate change impacts

drainage

coastal development

channel morphology

UPSTREAM

DOWNSTREAM

defences

natural habitats

de-commissioning


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Water Quality and Quantity

Water Quality

Algal activity –( eutrophication). Could be added cost

Water Resources

– future availability? May be improved.


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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.


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Proposed turbine designa 7m diameter “Straflo” turbine

9 OR 10m proposed for Severn.

AT 60 rpm

BLADE TIP VELOCITY WOULD EXCEED 30 M/S


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turbine mortality

(source STPG, from SDC Report 2007).

Salmon - adults = 40%

- smolts = 10%

Eels adult = 28%

Shad juvenile = 53%


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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


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Annapolis (Bay of Funday)- 0.2 % energy of Cardiff – Weston.


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The Environment

  • Messages from the Bay of Fundy-Eric Van Walsum

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


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Conclusions

  • The last 30 years – knowledge gaps

  • Unknowns and risk

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


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