This applet displays fractal drainage patterns.
Begin exploring by using the "Preset" choice at the bottom - and the "Restart" button below it - to see some of the possible configurations.
Configurable parameters include a number of manual colour-map controls (on the left) - and six main parameters of the fractal drainage system (on the right).
Take care if using the other controls on the right. They are usually very sensitive.
The model is a cellular automaton, based on the [Moore neighbourhood].
Toroidial boundary constraints are appled, so the images will tesselate seamlessly.
Optionally, a bumpmap technique is employed to give the images a sense of depth.
The controls on the right are described - using the metaphor of erosion of landscape caused by rain - as follows: