Welcome to the Jubilee River swamp.....
(Will the EA ever admit their mistakes?)

The Environment Agency has won the International Theiss River Prize of £218,000 for environmental improvements to the Thames and Jubilee Rivers.
The truth is that the Thames is no longer dredged for flood defence purposes and the probability of flooding is increasing due to bed rise, the £110m Jubilee River fell apart on first use in 2003 which resulted in £5m for repairs and a £2.75m out-of-court settlement, and the new channel is still unable to carry its design capacity.
Taplow Mill Leat had a £1m problem and the Taplow Control structure was built without a stilling basin, Manor Farm Weir was built back to front and Slough Weir protection was stripped away by flood water (£680,000 to repair)
The Myrke embankment that has already been rebuilt once in 2004 at a cost of £1.3m is degrading rapidly, the bend radius problem is unresolved and the channel is overwhelmed by algae every Summer.
Please also see Algae at Slough Weir - Aug 2010 , Letter from Robert Runcie (June 2006) , What's wrong with the Jubilee River and Algal mat warning sign - July 2009
The Jubilee River story - October 2010 - The International Thiess River Prize
You can find the EA map of the Jubilee River here: Jubilee River - MAP (EA) 163Kb.pdf