When a rigid object is submerged in a fluid (completely or partially), there exists an upward force on the object that is equal to the weight of the fluid that is displaced by the object. The examples in this document show that the specific conditions of each secondary containment unit must be considered to determine the level of pesticide in a tank that would make it heavy enough to be anchored for the purposes of complying with the containment regulations.
You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.- Buoyant Force Calculations (PDF)(4 pp, 101 K)