Welcome to European Tribune. It's gone a bit quiet around here these days, but it's still going.
I mentioned turbulence for the upper limit. As land is rougher than water you have to climb higher in order for the boundary layer to set in. The lower limit on water should be a function of typical wave height in rough weather.

A society committed to the notion that government is always bad will have bad government. And it doesn't have to be that way. — Paul Krugman
by Carrie (migeru at eurotrib dot com) on Thu Feb 9th, 2006 at 07:30:08 AM EST
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