I've never been a big fan of terrain that sits 'on top' of the table, when it is suppose to be 'in' or 'under' the level of the gaming table. Obviously that is difficult to model when you have a solid surface to game on, so I think this method for making some simple rivers is pretty effective.
You can check out the original post I saw on Facebook here -
https://www.facebook.com/media/set/?vanity=boltactionalliance&set=a.1782919891743599
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