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<br />12 <br /> <br />Structural Measures - Flood control works such as dams and reservoirs, levees and floodwalls, <br />channel alterations, seawalls, and diversion channels which are designed to keep water <br />away from specific developments and/or populated areas to reduce flooding in such areas. <br /> <br />Watercourse - A natural or artificial channel in which a flow of water occurs either continually <br />or intermittently, <br /> <br />Water Surface Elevation - The heights, usually in relation to mean sea level, reached by flows <br />of various magnitudes and frequencies at pertinent points in the flood plain. This manual <br />denotes the water surface elevation by the symbol <br /> <br />Water Table - The uppermost zone of water saturation in the ground, <br />