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A river falling at 5% would not be navigable, and would likely be rushing rapids as well as rather shallow. So, you should place a lot of boulders and "waterfall" shelves, as was mentioned before. However, you wouldn't need to make continous horizontal "dams" to make this work. One thing you can do is take cotton balls, tease them out a bit, glue them at the breaches in the dam where the water cascades down, and then use either epoxy or gloss medium or whatever your water material will be to saturate the cotton ball. While it is setting up, you'll be able to tease the cotton into shape, creating the whitewater which will complete the dam. Let that cure or set up, and then you'll be able to pour in behind it normally. Ideally, you'd fill in behind until it begins to flow over the rapids you just created, so that everything ties together fluidly. <br /> <br />All of this is going to require breaking things up into discrete segments, which might rule out two-part epoxy. I prefer epoxy, but mixing it up is inconvenient and unreliable in small batches; you have to get the proportions right or it won't cure fully. So I would consider the other options first.
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