Russell McMahon wrote:

> My friend Ken Mardle provided this reference
> 
>         http://www.engineeringtoolbox.com/darcy-weisbach-equation-d_646.html
> 
> which looks like it will be highly useful once I take the time to come 
> to grips with its nuances.

This talks about the same calculations I just wrote about. The page took a
while to load here, so I only saw this now, after I already sent the other
message. In this page you'll find some more detailed explanations (and the
correct terms in English :) of the formulas I used.

Gerhard

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