> > > Although a height difference between in and out might indicate a weir or > > other obstruction may well indicate that a route is non-navigable? The > > outflow from a dam may have the same name, but have no use as a through > > route? > > This is more about the water flow than about being navigable by a ship. > > I assumed that when the wiki spoke about "routable" it was referring to the water flow rather than boat/ship/barge traffic. In any event, a routing engine for boats could use the presence of a dam or weir (combined with the absence of a lock) to deduce that ship navigation was not possible.
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