On Tue, Aug 4, 2020 at 12:31 PM Kevin Kenny <kevin.b.ke...@gmail.com> wrote:
> The Hudson definitely reverses flow. One of its names among the First > Peoples translates to 'the river flows both ways.' The division in the > flow lies less in the fraction of the tidal cycle than the speed of the > current. It flows 'upstream' for half the time, 'downstream' for half, but > the downstream current is considerably swifter. > As long as the current is significantly faster in the downstream direction, this qualifies by the standard that "the river current is clearly the dominating current in the water" - that is, oceanic currents and wind-driven currents are not the definition characteristic In contrast, the East River, which is a tidal strait, would need to be mapped on the marine side of the coastline, since the current flows through the East River are not related to a fresh-water river current at all. https://en.wikipedia.org/wiki/East_River By using the dominant currents as a definition, this allows local mappers with knowledge of the water to determine the right tagging. -- Joseph Eisenberg
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