
Originally Posted by
Juggernaut1981
RE: City populations
To get a feel for what everything should look/feel like... your big Harbour City would be Paris or Hamburg in the 1400s. (Unless you're going to add all sorts of magical constructions and sanitation)
RE: Diverting
To support the kinds of population you're talking about, there will need to be a pile of water sources. Most of the "local water sources" will be local creeks and streams that flow into your major river, but the river needs to drain and ANY river will head to the bottom of a valley and head to the sea. (unless you're in Australia where a bunch of them just drain into the Great Artesian Basin underground). So assuming a "European" climate, your "river visible at the scale of a nation" will head into the bottom of the nearby valley and stay basically at the bottom.