Working on a ambitious world generating tool...

[Redrobes]

Everyone is finding it hard to do water flow accurately. There has been a number of people who have something that's an approximation to it. All of them have good and bad. The better ones seem to be very slow.

To do the wobble in a river thats a "meander" so similar word. Check out the wikipedia entry:
http://en.wikipedia.org/wiki/Meander

also Rilles:
http://en.wikipedia.org/wiki/Rille

If you want them in your rivers you will need to track sediment as well as water. You have to put down sediment that the water carries until the river changes direction. To do that you need to track the water speed and possibly pressure. It all starts to get hard very quickly.

I write one called GeoTerSys on my sig below.

I also write a zoom campaign manager too. Thats on the sig as ViewingDale. If your able to view AVI movies with an XviD codec look through these movies:
http://www.cartographersguild.com/showthread.php?t=2182

Try using VLC movie viewer.
http://www.videolan.org/vlc/

Also check out:
Wilbur - http://www.ridgenet.net/~jslayton/software.html
GeoControl - http://www.geocontrol2.com/e_index.htm
L3DT - http://www.bundysoft.com/L3DT/
WorldaMachine - http://www.world-machine.com/features.html
http://www.iahr.org/membersonly/graz...00/000/364.htm

The last one has some maths about the physics behind the process. You might have to simplify the process tho. Theres a big list of references there too to go through.

Oh yeah, also check out these movies from Ron Fedkiw's page of research work with his students. Some of the fluid ones are particularly interesting. The papers for them are available though difficult to understand and definitely difficult to implement for large terrain surfaces.
http://physbam.stanford.edu/~fedkiw/