"WaIIy" wrote in message
...
On Mon, 29 Nov 2004 17:13:54 -0800, "Mark" wrote:

I would have agreed with the width/length of the tank/dam doesn't matter
....
but ... then why are dams so thick at the top? Dams can be 20 / 30 / ...
feet thick at the top where the water is only a few inches deep. There is
more to this than me thinks!


Dams are thicker on the bottom, not the top.

True, but they can be thick at the top also.