Hydrologic Oranges

In the US a standard of natural resource undergrad classes is some type of hydrologic assessment lab, class, or whatever. These assessments include measuring depth, velocity and highly specialized equipment.

A key component of this equipment includes a Californian Orange.
Why?
Because to measure velocity you need to measure how long it takes an object to travel from point A to point B down the river. Oranges are ideal for this because the are brightly colored (easy to find) and bio-degradable should you commit the atrocity of loosing your equipment. But, you can only use California oranges because for some reason they float while Florida oranges sink.

Australia is fully capable of growing its own oranges. So the question is do they sink or float?

They Float!!!