More on Riverworks

Radio Prague has just run this article:
'Regarding finds, the Vltava River, as it flows through the South Bohemian gem that of Český Krumlov, has begun giving up objects lost for centuries in its waters. The finds were made while locals were implementing anti-flood measures and include coins, keys, decorative items, and jewellery. On the shores of the Vltava, archaeologists found Baroque lockets once used to hold images of saints, which women wore around their necks and men attached to their belts. One researcher said that the items most typically lost were heavy keys, which only goes to show some things never change: invisible key- gnomes had their work cut out for them even then!'

Well, we watched the archaeologist with his metal detector, but how much more was lost by the destructive nature of the works - organic matter such as timbers in the riverbed (see above), stones and pottery?