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.
Severn Tidal Impoundments
Erode or Deposit? The impact on Flood Defence. – May have some benefit but other impacts.
Algal activity –( eutrophication). Could be added cost
– future availability? May be improved.
9 OR 10m proposed for Severn.
AT 60 rpm
BLADE TIP VELOCITY WOULD EXCEED 30 M/S
(source STPG, from SDC Report 2007).
Salmon - adults = 40%
- smolts = 10%
Eels adult = 28%
Shad juvenile = 53%
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