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<br />flQOd Stage. The stage or elevation at which overflow of ~he nat_ <br />ural bank5 of a stream or body of water begins in the reach Or <br />area in which the elevation i~ ~dsurad. <br /> <br />SOO-year flood. A flood having a 0.2 percent cbance of occurring <br />or being ~ceeded in anyone year period at a de~lgnAted location. <br />Thc 500-~~r flood Is a r~re evcnt, but could reasonably be expec- <br />ted to occur. It represents the reasonably upper liIllit5 of exp~'C- <br />tedflooding. <br /> <br />Left or Right Rank. The b.~nk on the left or right side of a river, <br />stream, or watercourse, looking downstream. <br /> <br />overbankflo.... Ploodflo...soutsidethornainchannel. <br /> <br />Shallow Flooding. Oistribution of floodwater is nonuniform and the <br />flow path is unpredictable <br /> <br />Underclearance. The lowest point of the opening of a bridge, cul- <br />vert, Or other structure over or across a river. stream, or water- <br />cours" through which water flows. <br /> <br />f <br /> <br />, <br />I <br />, <br /> <br />IO-year Flood. A flood having a ten p"rcent chance of occurring or <br />being exceeded in any one y~r period at ~ designated location. <br /> <br />SO-year Flood. A flood having a five percent chance of occurring <br />or being exceeded in anyone year period at a designated location. <br /> <br />lOO-year Flood. A flood having a Doe percent chance of occurring <br />Or being ~-xc"edcd in any on.. year period at a designated location. <br />It is reasonably expected to occUr once in 100 y~ar~, hut it may <br />h~ two or three timAS ~ithin a lOO_year period. It is based on <br />statistical "r~lysis of str~am!low records available for tho water- <br />shed and analyses of rainfall and runoff characteristics in the <br />general region of the ~atersh~d. The lOO_year flood has been known <br />as the Intermediate negional Flood. <br /> <br />" <br /> <br />" <br />