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<br />Flood St.,Qe, The st"ge or elev"tion at ",hich overflo," of the <br />natural banks of " stream or body of water begins in the reach <br />or arsa in ",hich the elevation is measured. <br /> <br />floodwa". The minimum area of the flood pl"in that is required to <br />convey a flood peak of a selected magnitude. Thie usually consists <br />of the moat hazardous are" of the flood plain ",here ",ater veloci~ <br />ties ere significant. Areas on the landward 9ide of a floodway <br />normally convey little floodflo,", "lthough they are inundated during <br />floods. <br /> <br />Intermediate Reeion..l flood. A flood having an average frequency <br />of occurrence in the order of once in 100 years although the flood <br />meyoccur in"ny year. It is b"ged on statistical an"lys".. of <br />rainfall "nd runoff characteristics in the general region of the <br />"atershed. <br /> <br />Left or Rieht Sank. The b"nk on the left or right side of " river, <br />stre~, or ",atercourse, looking downstream. <br /> <br />Low Steel or Undercloar~nce. The lo~st point of a bridge or other <br />structure over or dC.O~U ~ river, stream, or "'etercouro~ th~t limits <br />the opening through which ",ater flows. <br /> <br />Standard Proiect rlood. The flood that ~ey be expected from the <br />most severe combination of meteorologic"l end hydrological condi~ <br />tiono that is considered reasonably characteristic of the geogreph~ <br />ic~l aree in ",hich the dreinage basin ia located, excluding ex- <br />trenely rerB conbin~tions. Peek dischargos for these floods ers <br />generally ebout 40% to 60% of the probable maximum floods for the <br />S8~e basins. Such flOOds, as used by the Corps of [ngin~ore, ~re <br />intended as proctic~ble expressione Of th~ degree 01 protection <br />th~t shuuld be sought in the design of flood ~ontrol works, the <br />failure of whiCh migllt be di"a8trou~. <br /> <br />" <br />