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<br />Standard Project Flood <br />Thetloodthatmaybe€l'<pectedfrCf'lthemostseverec<;;t':1bina- <br />tion of meteorological and hydrological conditions that are considered <br />reasonably'charactoristicotthegaograpl,icalarea in "hich the drain- <br />ago basin is located, excludillg oxtr~,oly rare combinations. Peak <br />dlschargesforthesefloodsarege<1Orallyabout4)-60percentof-the <br />Prooable.'4axlmumFloodstorthosar:lebasins. As sued by the Corps of <br />Engineers, S-tandard ProJoct Floods are intended as practicable Blpres- <br />sions of the degree ot protection that should bo sought in the design <br />of flood control works,thefailureofwhichmlghtbodlsastrous. <br /> <br />Top of waterway <br />This is the rool of the opening in a stream crossing through <br />which water f low~ under nOrm<l1 COM Itlorls. It I s the underside of <br />-the dock spiln - ~anetimes ca lied "low stool," the roof of a box cul- <br />vort or the crown 01 an arched or circular culvort. <br /> <br />" <br />