This is an Animation based on an early version of the Canal Basin Outline which shows the basic concept of moving in and out of the basin with a full length canal boat.  As a result of doing this the basin position and shape was changed to make the entrance into the basin possible.  You will notice if you look at the latest drawings the basin is in a different position from this early drawing.

For the basin to be practical at all there is not all that much scope for it to be a different shape.

Note also the sharp turn at Chemistry Bridge and  the method of turning once in the basin.

There are some parts of these movements which seem almost impossible to do elegantly - without in effect bouncing off the side.

We will need to redo this exercise again soon to check for any issues that can be eased by adjusting the shape of the channel or the basin.