Every grain of sand washed away by rain from mountains and from the land finally reaches these obstacles called dams which we built across rivers and remains there, diminishing further the water storage capacity of dams.

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The work is part of a bigger project which has included a new sea defence structure further along the seafront to stop the sand being washed away in future.

BBC: Colwyn Bay beach

Engineers say the beach once had more sand but it has been washed away over the past few decades.

BBC: Colwyn Bay beach

Storm waves and high winds have washed away thousands of tonnes of beach sand in front of the launching area for a Norfolk lifeboat.

BBC: Lifeboat launch area washed away by tides and storms

Puglia's other most inspirational stretch lies between Otranto and Santa Maria de Leuca, interspersing dramatic rocks washed by translucent waters and soft-sand beaches backed by shady forests, where the cri-cri of the cicale (crickets) almost deafens in summer.

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The beach used to have more sand, but it has been washed away over recent decades.

BBC: Porth Eirias watersports centre