Re: NANFA-- tangerines in streams

Jay DeLong (
Wed, 13 Dec 2000 19:15:41 -0800


>Toss it in the water, measure the time it takes to go a pre-measured
>distance and hey, you have the speed of the water at the surface. :)

Correct, Sajjad! Indeed it is Alabama U Dave's self-labeled Auburn U model
current-velocity meter. Why?
1- oranges float
2- they float just below the surface so they aren't affected by wind
3- and they are visible (unless the water is orange, I guess)

Surface velocity isn't the best measurement of current velocity. A better
estimate is made by taking a measurement with an adjustible velocity meter
somewhere near 4/10 the depth from the surface.

>A healthy snack?

Yes, an edible field instrument, and all you have to take back out is the
packaging :-)

Jay DeLong
Olympia, WA

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