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<br />Flood Stage. The stage or elevation at which overflow of the natural <br />banks of a stream or body of water begins in the readh or area in <br />which the elevation is measured. <br /> <br />Floodwav. The minimum area of the flood plain that is required to <br />convey a flood peak of a selected magnitude. This usually consists <br />of the most hazardous area of the flood plain where water veloci- <br />ties are significant, ~reas on the landward side of a floodway <br />normally convey little flood flow, although they are inundated during <br />floods. <br /> <br />Intermediate Regional Flood. h flood having an average frequency <br />of occurrence in the order of Once in 100 years although the flood <br />may occur in any year. It is based on statistical analyses of <br />rainfall and runoff charaoteristics in the general region of the <br />watershed. <br /> <br />LOw Steel or Underclearance. The lowest point of a bridge or other <br />structure oVer or across a river, stream, or watercourse that limits <br />the opening through which water flows. <br /> <br />Sheet Flow. ~ flow of water that has shallow depths, unpredictable <br />flow paths, and the areal distribution of the flooding is non-uniform. <br /> <br />Standard Project Flood. The flood that may be ex~cted from the <br />most severe combination of meteorological and hydrological Condi- <br />tions that is considered reasonably Characteristic of the geograph- <br />ical area in which the drainage basin is located, excluding <br />extremely rare combinations. Peak di~chargC9 for these floods are <br />generally about 40\ to 60' of the probable maximum floods (or the <br />same bagins. such floods, as used by the corps of Engineers, are <br />intended as practicable expressions of the degree of protection <br />that should be sought in the design of flood control works, the <br />failure of which might be disastrous. <br /> <br />" <br /> <br />l <br />