The Environment Agency is repairing the seal on the glass panels along High Hill in Keswick after they were damaged during flooding in December last year.
The project follows work already undertaken to remove gravel washed down by the river during the floods.
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Each panel will be removed, refurbished and replaced in batches of six, while temporary metal sheets will be fitted while the glass panes are repaired.
Floods Minister Rory Stewart said: "This work in Keswick is part of an extensive £10million programme in Cumbria that has already seen more than 3,000 flood defences inspected, with around 100 repair projects set to be completed by the autumn.
"We are also investing over £43million to better protect more than 3,500 homes across the county over the next five years."
(LM/JP)
