
I made by hand the following image using several buckets of water. Faking a stone cropping for spring in the background. Digged a channel for the water with couple of ponds (3x3) along the way. Of course, this would require a major rewrite of the world generation code adding a whole routine of erosion. Though I have seen it with sand in gravel being dragged through caves so parts of the routine exists and could be used.
Thoughts?