Well the definition seems clear enough to me, but the applicability not so much.
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Water scrubbed rocks? Change in vegetation? Were the water actually is now? In this example it's not even relevant as the shoreline is altered and the minute that happens it is fixed to the time of its last natural position.
Rule of thumb is that the limit between the crown watercourse and the private riparian land owner is the water's edge and that limit is ambulatory. But even that is a really hard thing to figure out with swamps, floating patches of bull rushes and ownership around controlled lakes that is set to a specific elevation regardless of where the water is.