T&T: Hudson tides

[Jim Ague]

> The tidal current in the more constricted portions of the river can reach
> almost 3 knots. The speed of the ebb and flow currents are so nearly 
> matched that
> it would take a bottle dropped in the river at Albany nearly half a year 
> to
> reach New York City, 150 miles downstream.

Applying some physics roughly, wouldn't that suggest that the non-tidal 
portion of the Hudson River current is about 1 nm/d(150nm/180d)? Or 0.04 
kts? That doesn't sound right.

-- Jim Ague