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Originally Posted by gottaq
wow that's crazy. but if the rivers eventually turn into more sea, does this mean that towns along the rivers will become flooded? will the water actually be higher, or will they just have more 'ocean' properties?
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if those towns and cities are below the future sea level then they will be flooded, if not then they will be pretty much safe. However as rivers get closer to sea they tend to get shallower and wider, so the banks of the rivers will start to erode so some parts of the river front might get washed away. Also something to keep in mind is that some of the land lost will be regained by the formation of a new river delta.
Also this more sea like river would be called an estuary.