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<br />24 <br /> <br /> <br />. <br />. <br /> <br />Flood Staqe <br />The stage or elevation at which overflow of the natural <br />banks of a stream or body of water begins in the reach or area in <br />which the elevation is measured. <br /> <br />Head Loss <br /> <br />The effect of obstructions, such as narrow bridge open- <br />ings or buildings that ,limit the area through which water must <br />flow, raising the surface of the water upstream from the obstruc- <br />tion. <br /> <br />Left Bank <br /> <br />The bank on the left side of a river, stream, or water <br />course, looking downstream. <br /> <br />Riqht Bank <br />The bank on the right side of a river, stream, or water <br />course looking downstream. <br /> <br />10-Year, 50-Year, 100-Year, SOO-Year Flood <br />A flood having a 10,2, I, and .2 percent probabi lity, <br />respectively, of occurrence in any year or an average frequency of <br />occurrence in the order of once in 10, 50, 100, and 500 years, <br />respectively. The flood may occur in any year. It is based on <br />statistical analysis of streamflow records and analysis of rain- <br />fal I and runoff characteristics in the general region of the <br />watershed. <br />