What is the required minimum thickness of a concrete floor that will be constructed under water at a depth of 5 meters (m) below the soil surface? (Assume the water table is 1 meter below the soil surface and the weight of concrete is 25 kN/m³.)

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The required minimum thickness of a concrete floor that will be constructed under water at a depth of 5 meters below the soil surface is 2.58 m. Solution: Use the equation (* assumed given in NCEES PE Reference Manual) D > (h-d) ?_w / (?_b - ?_w ) Where D = floor thickness, ?_b = weight of concrete, ?_w =unit weight of water, and h = depth below water h = 5 m d = 1 m ?_w = 9.81 kN/m³ ?_b = 25 kN/m³ Therefore, D > (4 m) (9.81 kN/m³) / (25 - 9.81 kN/m³) D > 2.58 m

What Is the Required Minimum Thickness of a Concrete Floor