| http://www.w3.org/ns/prov#value | - i have spent over 30 years digging rivers in the uk and europe, and even now your questions are not easy to answer. every river is different, a lot depends on if your chosen river is a large tidal river maybe a quarter mile across or a fast flowing river thats only 20 foot wide. every river has altered in the last 500 years, for example some rivers have got wider over time meaning large areas of d
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