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<br />I n ..hi Ch rhll elevation is mea5u~<ld. <br /> <br />F loodway. The ",In!m~rr; area of the flood pl!lln thllt 1$ ~equl rlld to <br />convey a flood pe~k of a ~elected ma~nltu.de. Th15 u$uclly corslsts <br />of the rcst hazardous area of the flOO<J pl!lin whe~e water velocities <br />are significant. Areas on the landw"rdsldeotafloodwaynorll'l8lly <br />convey I itt Ie f loodflow, although th"y are i ~undated duri ng floods. <br /> <br />I nterrredlato Roqional Flood. A flood h,.,vlng an averag" frequoncy <br />01 occurrence In the order of once in 100 yMrs, although the flood <br />may occur in any YOllr. It Is b!lsed on st(ltistlcal an!llyses ot rain- <br />tall and runoff characterIstics In the genllral region of the water- <br />shed. <br /> <br />Low St5a1 or Underclearence. The lowest poInt of a bridge or other <br />structul"tloveroracrossarlver,strellm,orW!lrercoursethat limits <br />tr.e opening through whIch wllter flows. <br /> <br />Standard P~oiect Flood. The flood thllt may be expected from the <br />most severo combination of meteorologIcal and hydrological condi- <br />tions that is con$lderad reason!lb IV charecte~lstlc of the geographi- <br />cal area in wnich the draln!lge b!lsln Is located, exclUdIng 'lxtr/lmeiy <br />rare combinatIons. Peak disc"..arges for these floods a~e gtlnerally <br />abou-t40:tto60%oftheprobablemaximumfloodsforthesar<ebasins. <br />S"ch floods are used bv tl'>e Corps of Engineers, are lfitended as prac- <br />ticable expressions of the degree of protection that sho"ld be sought <br />In thB design ot fioodcontrol OIorks, the fall"reofwhich'1llghtbc <br />dis<lstro.Js. <br /> <br />JI <br />