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petermac33 said..
Also,is the bottom of the trench / canal built to take into account the claimed curvature? Or,is it built perfectly horizontal as seems almost certain?
Of course it's perfectly horizontal idiot, other wise the water would all run up one end, wouldn't it???????
But it also follows the earths curvature, other wise it would be going up hill at the ends.
You still don't get curved level do you?
Just get it into your head.
HORIZONTAL doesn't = STRAIGHT.
They are two different things altogether.
Straight is a line connecting the shortest distance between two points.
Horizontal is a line at right angles to the line to the centre of gravity. And this line is curved!