Efforts to protect a section of coastline near Sidmouth have been hampered by recent stormy weather.
Cliffs at Pennington Point were to be shored up with shingle dredged from the River Sid.
But the shingle, left on the beach prior to being moved, has been washed away by high tides and bad weather.
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A teenage girl who drowned when a speedboat capsized was wearing a buoyancy aid that was too large for her.
An inquest into the death of a 14-year-old girl who died after becoming trapped under a speedboat in Devon resumes today.