[lowfighter]

I think a sort of texture could do it. Have all sort of small waterfall segments running all directions but such that if you place one pixel on map_T ONLY ONE waterfal segment is visible. Place then tentatively one pixel where you want the waterfall to be. If direction of waterfal suits you then adjust the "real water" in map_c such that it matches the end of the waterfall. If direction of waterfall doesn't suit, place next pixel which might suit. And so on, some more posibilities of adjusting, adjusting terrain, adjusting water instead to suit it. Small compromises in water position are not really a big deal because the changes would be within a couple of hundred meters. This is just an aplication of Clock Watcher's idea of having different patterns on different parts on the same texture. Again, to me generally it doesn't matter theat you can't place the pattern exactly where you want, because you can always adjust things such that they fit together.