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Design Challenge : accurately measure several liquids in a container

Catwell
It has been a while since my last Design Challenge to the community, but it's time to get back into the groove and working the prefrontal cortex. Innovation is spurred through creative thinking, so give it a shot even if you don't reply.
 
Similar to one I proposed in the past, Measuring liquid inside a closed container, but now you can put anything you want into the container. But it isn't that easy. I want to measure two different liquids that a present in the container, water and oil.
 
Here are the requirements:
1. Monitor a container that is between 10-15 feet tall and 10 feet in diameter
2. Report the whole volume of liquid in the container
3. Report the amount of water, or water level
4. Report how much total oil is present
5. Constantly measure changes
6. Report back with an accuracy of about a 1/10th of a gallon. (or as accurate as possible)

 
 
I have a few ideas, but I don't want to contaminate early ideas with my own.

 
 
There is not right or wrong answer, so give it a shot.

 
 
Cabe


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    If the container is a cylinder with a fixed diameter, you can meaure the thickness of each layer of liquid (assuming they seperate), but to be within 1/10th of a gallon accuracy would mean you must be able to accurately a measure thickness of ~.001" for water and know the density of the oil.  At a radius of 5', a gallon of water only has a thickness of .02".

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    If the container is a cylinder with a fixed diameter, you can meaure the thickness of each layer of liquid (assuming they seperate), but to be within 1/10th of a gallon accuracy would mean you must be able to accurately a measure thickness of ~.001" for water and know the density of the oil.  At a radius of 5', a gallon of water only has a thickness of .02".

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