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<br />:.!..O<.ld ~t~q" <br />The 5CJge or el"v.]t;on ~t '"hich ovnrflo--.. 0' the Mtur~1 <br />ll~n"~ 01 ~ St"'0~r.l or b?~y -:,' ','at'Jr beJi1s in thl,) ~eec1 or Jrea in <br /> <br />the dr~in~{Je basln i~ loca1"ed, excluding \lxtre<"1ely rare comblMtlons. <br />Peak di scl1arges lor these f loods ~re genar<llly <lboyt 40 percenf to <br />60 percent of the Prob~ble Haxi~y~ Floods for the same basins. Sych <br />110005, ~s ysed by the Corps 01 Enginee.s, are Intended as pr~cticabl~ <br />expresSions of the degree of protection that should be sought in the <br />desigr'> of flood cOr'>trol works, tl)e f~i I~re of whl<:~ might he d is<lsfrOU5. <br /> <br /><<I)ie" b)() "Iovation i s 0\""s~re1. <br /> <br />l,cadLo'lS <br /> <br />Th', "ttecf ot obsfructions, s~ch ,,~ nilrrml :Jr;d,lo:l rorenlr>g5 <br />or ~~ II dings thJt I im I t the area throu\jh \1h i eh 'oJ ter mu <;~ t low, <br />raisirKJ t~e surfJce of hB '~~ter' Jpsfnmm trom the obstructjon. <br /> <br />UMerclear<lnce <br />The low85t point of a bridge or orner structure over or <br />across a rIve., stream or w~tor course that limits tne opening <br />fhrollgh whic;hwater flows. Tnls Is referred to as "Iowsteol" in <br />sCtl1eregions. <br /> <br />.!_!!.t_er'"ed_i_a~:(G2i...o_~a...!_J.I,:?-,~ <br />f', flood rBv in!! a OllO porCiCnt ~robaJ i I i ty or ~ n avera~e <br />frequency of occurrence i n ~he order at once In I'y) vears although <br />t~\() flood 'n~y occ~r In uny yoar. It Is based on statistical an~l- <br />ySQ~ of stroi)'" flo\'.' rocon;, avai l<lble for the w"tershCtJ ~nd ilna lyses <br />of rd I nfa II nnd ru nof f char~ctcr I sf I cs ;" ~hc "renf'ra I res i cn of the <br />wat<lrshod." <br /> <br />L<lfthnnk <br /> <br />Th" ."~"k O~ TO" left- si1e ,,~ J ri.'1wr, ,tro",,", or '~i;~er <br /> <br />cnUf$(), 100< i~'J u()wr'>srred"'. <br /> <br />Lao Steel (or L'nuerc Ic"r.,r'~") <br />,-- <br /> <br />Se" ""ndercle~rance." <br /> <br />'(iJhllx.ok <br /> <br />ThO baok on the ri(;ht' s idtJ of J r lv,,,, stT'-'d'f1 o~ ~~tf,r <br />cours.., 100< In,1 d"wn5tre~m. <br /> <br />Standardf'roJectFlood <br />The flood that ~y be expected from th~ most SDvcrc cor- <br />Din~tlon of ~~teoroloaical ann hydrol~1Jic~1 conditior~ thJt ~re con- <br />siderAd ....ldson<lbly \;hijr,Jcteristl\; of th.. g"C><Jra:Jhjc~1 arc~ i~ '~~ic~ <br /> <br />(;rl <br /> <br />" <br />