We have had some discussion in our office over the proper way to calculate the effect of buoyancy on a 18' deep wet well (5' dia with a 8'x8'x12" bottom slab). Such topics of discussion include: whether or not to use the submerged weight of the soil on the foundation or the dry unit weight in calculating its effect against buoyancy. Also, one guy said to take into account as the volume of water displaced as the volume above the footprint of the footing, whereas I thought the volume of displaced would be exactly that of the structure.
What would be the steps that you would use to determine if the manhole would float?
Thanks in advance
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