What a gravel bar records after a flood
An exposed gravel bar holds traces of material carried, deposited and left in place. Its stones tell a fuller flood story when read with the river's earlier shape and flow record.
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The sediment a reservoir holds back
A reservoir slows a river enough to store sand, gravel and silt. That deposit takes up water-storage space and changes the supply reaching channels and coasts downstream; surveys show why the outcome differs from one dam to another.