Mike Hord wrote:

> Apparently, water escaping from a hole in a reservoir under a given head
> h will travel with velocity equal to an object dropped from height h. 
> Hole size is NOT a parameter! 

Only as long as all the premises of the Bernoulli equation are valid. When
you get to small holes, the hole size (that is, the flow resistance) does
become a parameter. Think of it this way: in macro physics, there are
usually no discontinuities. With a hole size of 0, the flow speed is 0. So
as you approach hole size 0, the flow speed approaches 0, too.

Gerhard

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