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<br /> <br />[""i'''''' <br />.";;:-' <br />'" ' <br />~ "-'ii!!ij -.' <br /> <br />Stal'\dard Project Flood. The flood th~t m~y be expected <br />from the most severe combination of meteorological and hydrological <br />condltions that is considered reasonably characteristic of the <br />geographical area in which the drainage basin is located. excluding <br />extremely rare combinations. Peak discharges for these floods are <br />generally about 401 to 60S of the Probable Maximum FlOOds for the <br />same basins. Such floods. as used by the Corps of Engineers, are <br />intended as practicable expressions of the degree of protectio nthilt <br />should be sought in the design of flood control works, the failure <br />of which might be disastrous. <br /> <br />,~ ~;;-;) <br /> <br />~, <br />I.t <br />'-;' <br />, <br /> <br />Underclearance. The lowest point of a bridge or other <br />structure over or across a river, stream, or watercourse that limits <br />the opening through which water flows. This is referred to as <br />"low steel" in some regions. <br /> <br /> <br />, <br />, <br />, <br />{i. <br /> <br />'ii" <br /><. '11ft <br />I; <br /> <br />I <br /> <br />I <br />, <br /> <br />. <br /> <br />j <br /> <br />If <br />t <br />~ <br /> <br /> <br />i <br /> <br />, <br /> <br />1 <br />, <br />I <br /> <br />, <br />, <br />I <br /> <br />18 <br /> <br />~ <br />" <br />._-j <br /> <br />~i<: <br /> <br />" <br /> <br />. <br />