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plural riverbeds
(hydrology) The path where a river runs, or where a river once ran; the bottom earthen part of a river, not including the riverbanks. quotations
Detailed laser surveys carried out by Network Rail revealed that fast-flowing water on the River Eden has caused parts of the riverbed to wash away, posing a risk to the viaduct foundations.
2021 September 8, “Network News: West Coast Main Line viaducts reinforced by underwater concrete”, in RAIL, number 939, page 10