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<br />42 <br /> <br />&.2.3 Methodology <br /> <br />The basic equations for analyzing hydrostatic forces are presented here. They will be used <br />in examples and applications in the following chapters, <br /> <br />During a flooding condition. the buildup or depth of water a structure is subject to creates a <br />hydrostatic pressure distribution where the pressure ph acting at a point is <br /> <br />p=y.h <br /> <br />where p is in pounds per square foot, y is the specific weight of water (&2.4 Ibslft 3) and <br />h is generally the distance in feet measured vertically downward from the water surface to <br />the point of action (see Figure &,1). The resultant horizontal hydrostatic force FH acting per <br />lineal foot on a submerged wallar basement is the total area of the pressure distribution <br />given by <br /> <br />FH = v, P . h = '12 yh' <br /> <br />where distance h is from the water surface to the ground level or bottom of the wall, and <br />FH is in pounds per lineal foot. The resultant force is assumed to act horizontally at a point <br />h/3 from the bottom (see Figure &,1). <br /> <br /> <br />Fh ' RESULTANT LATERAL FORCE DUE <br />TO HYDROSTATIC PRESSURE DISTRIBUTION <br /> <br />HYDROSTATIC <br />PRESSURE DISTRI BUTlON <br /> <br />P 'PRESSURE AT A DEPTH h <br /> <br /> <br />t ,SPECIFIC WEIGHT OF WATER <br /> <br />FH ~Ph'~l h' <br /> <br />P , ~h <br /> <br />Figure 6,1, Hydrosla~ic force diagram. <br /> <br />This condition assumes that the structure or wall is completely above ground. When the <br />wall is part of a basement that is below ground, the soil pressure must also be considered. <br />The condition where lateral soil pressure must be considered is discussed later in this <br />section. <br />