That does make sense but even small trickling streams turn into torrents of water during the rainy season and that is when the erosion takes place, if you are going for a meandering stream look then the smooth round stones won't be as natural because they would most likly be covete in silt an plants. Look up pics on jungle streams to see what I'm talking about, if you are going for the look of a major river like the Congo then big round rocks make sense.
Len
Len
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