I don't remember this as a common situation back when I first played Civ3, but I think I've been dealt 2/4 games since reinstalling, and the current game I just started looks like it's going the same way (though I only have about 50% of the world explored so far). They have been small/normal sized maps with every other setting in the middle. With no freshwater lakes on any of the 3 continents I've settled so far in this current game, I have managed to make it to ~900AD without irrigating a single tile. This seems like pretty unlikely odds I'm hitting, so I'm curious if this is actually more common than I remember, or is it possible to influence map generation in some way by customising the .biq file? So far my customisations have been almost entirely restricted to governments and units, nothing with any obvious connection to terrain.