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It's simple. The tides at each end of the canal, Cape Cod Bay and Buzzards Bay, are not in sync, or are almost always different. Thus, the water elevation at each end is always different, and always shifting relative to which is going out, and which is coming in, which also changes the direction of the current as well. When the elevations are the same, for a brief point in time as the tides pass each other, after residual effects of motion have taken place, there is no current. I've never been able to actually pin point in time it happening, although I enjoyed doing so.

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17y ago

What else can I help you with?