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<br />dralrJ<lge basin Is located, excludirl!1 extrilmely rarecombiMtlons.
<br />Pe/lkdisct>arges for these floods/lfe generally about 40 percent to
<br />60 percent 01 the Probable Maximum Floods for the same basins. Such
<br />floods, as used by the Corps of EngIneers, are intended as practica~
<br />"ble expressions of the degree of orotection that should be sought In
<br />",,+he design ot f I cod control ~orks, the fa i lure ot whiCh ",ight be
<br />disastrous.
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<br />,~;::'~Top of Waterway
<br />::j;/k"" ThIs Is the roof of the opening in a stream crossing through
<br />,~~,'}(~,WhlCh water flows und~r normal conditions. It is the underside of
<br />~,~!:>.~1rthe deck span - somet,mes called "low steel," the roof of II box
<br />~J?;\~;\;,CUlvert or the crown of an arched or cIrcular culvert.
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