The idea is simple: Let's generate some rivers as usual, but omit the water. The hotter the biome (desert etc.), the higher the chance for dried river beds.

Additionally there could be rivers in the process of drying out, with a smaller stream in the middle of a taller river bed. This would fit into deserts where flowing water would carry the loose sand away (if there is no vegetation).

These are two great ideas! I'd support that! It should be configourable though. (on / off switch per feature)