Calculating Tank Volume from Liquid Depth: A Practical Guide

Bradenbraden
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Hi guys/gals,

I have a problem, my maths isn't that great. I have some underground storage tanks with petrol in them. and I can only measure depth of the liquid at the bottom. however i want to know the volume for disposal purposes. Can anyone tell me how to find the volume given the height of the petrol from the bottom? details are the tanks are 1.2m diameter, and the height of the liquid from the bottom of the tanks range between 6 to 30cm. the volumes of the tanks are estimated to be about 1000 to 2000 litres. This is a real life application, not homework.
the tanks are laying in the ground like a big pipe, not standing upright like a watertank.
 
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