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when the current is coming into the east end it is going from east to west.
The current are oppostie of wind direction. When you have an easterly wind, the wind is coming from the east. When you have an east tide the tide is going to the east.
The currents in the canal do not change direction when the tide changes.
If you take two large barrels and run a piece of pipe from one to the other and fill them both with water. If the level of water is even in both barrels then the water will not move through the pipe.
As soon as one barrel becomes lower than the other then the water will start runnning from the barrel with more water in it to the barrel with less water in it until they are even again.
The canal ist the pipe between the barrel, Cape Cod Bay being one barrel and Buzzards Bay being the other barrel.
When the tide is higher in CCB than it is in BB the current will flow from east to west and vice versa. For a short period of time during each tide the tide level is the same in both CCB and BB which is when you will get slack tide.
Hope that helps.
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