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<br />flood SteOH. Th.. etag~ or "lev"lior1 ..t which ove,flo", of the <br />natural bank~ of " $tru"m or body of water bagins in th~ reaoh <br />or.ree in which the elevation i5n1aasured. <br /> <br />floodwav. The mini~~ araa of the flood plain that is required to <br />convey a flood peak of ~ sel~cted magnitude. This usually con~ists <br />of the most hazardous arOa of the flood plain where watsr velo~i- <br />ties are signifi~"nt. Areas On the l"nd~erd side of " flood~"y <br />normally convey little floodflow, although they are inundated during <br />floode. <br /> <br />Int~rmediate Reoio~el rloorl. A flood having an average fr"que~cy <br />of occurrenc" in the order of onC8 in lCO years although the flood <br />may occur in any year. It,i~ based on st~tistlcal analys"$ of <br />rainfall and runoff cher"ct"ristlc~ in the general region of the <br />",,,tershed. <br /> <br />Left Or Riqht Bank. Th.. bank on the left or ,ight ,ide of a riv~r, <br />~tream, or watercour~e, looking do",n~tr""m. <br /> <br />Low Steel or Undercl,,"ran~e. The 10WSGt point of " bridge or other <br />stru~ture aver or a~ros, a river, stream, Or ",,,tercouree that limits <br />the opening through ~hich ~ater flowe. <br /> <br />Standard Proiect Flood. The flood that may bo expacted from the <br />most severe ~ombination of meteorological "nd hydrolo~ical condi_ <br />tions that is considercd rcasonably characteristic of the geograph- <br />ical area in ~hlch the drainage basin is located, excluding e<- <br />tremely r~re oombinations. Peak discherges for the,e floode are <br />generally about 40% to 60% of the prob~ble maximum floods for the <br />s~me b~eins. Such flood~, ~s used by the Corp~ of Engineers, ~ro <br />intended ~s practiceble expreseions Of the degree of protection <br />that 2hould b~ sou~ht in the design of flood control works, the <br />failuro of which might be diS~3trous. <br /> <br />" <br /> <br />I <br />I <br />, <br />I <br />