There is flood_prone=yes that can be used for these roads - but only where signposted.
Mark P. > On 27 Nov 2020, at 8:19 pm, cleary <o...@97k.com> wrote: > > In regard to sections of road that are subject to flooding, I think that is a > separate issue. Sometimes lengths of road may be signposted as floodways and > I am not aware if there is any appropriate OSM tagging for that. If so, it > should be only where signposted and we should not assume that every place > where a road crosses a stream is necessarily subject to flooding.
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