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<br />.. <br /> <br />Hydrostatic pressure on an enclosed area above grade can be calculated by multiplying the <br />specific weight of water (62.4 pounds per cubic foot) by the height of the water on the surface _ <br />being analyzed. The application of the force generated by hydrostatic pressure is always perpen- ,., <br />dicular (normal) to the surface in question. In the case of a submerged object, this means that <br />hydrostatic forces act in two ways. First, the force will act laterally (see Figure 5), which can <br />result in collapse of walls or movement of the entire building off its foundation. Second, the <br />force will act vertically (the vertical force is also known as buoyancy, see Figure 6), which can <br />result in the building being lifted from its foundation or floor system. <br /> <br />BFE <br /> <br /> <br />H <br /> <br />F = Resultant lalerallorce <br />h due 10 hydrastotic pressure <br />Ph = Hydrostatic pressure at H <br /> <br />w = Specific weight of waler <br /> <br />H = Depth 01 Haadwaters <br /> <br />P =wH <br />h <br /> <br /> <br />Figure 5. Lateral Hydrostafic Force and Pressure <br /> <br />e <br /> <br /> <br />BFE <br /> <br />Fb . Resultant vertical <br />{buoyanij <br />force due to <br />hydras/otic pressure <br />w = Specaic weight 01 <br />water <br />A = Area of horizontal <br />floor surface <br />H . Depth of floodwater <br /> <br />H <br /> <br /> <br /> <br />Fb = wAH <br /> <br />Figure 6. Buoyancy Force <br /> <br />e <br /> <br />6 <br />