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<br />VERSION 1.0 1/12/95 <br /> <br />B-C PROGRAM: Flood Hazard Risk <br /> <br />EXPECTED ANNUAL NUMBER OF FLOODS, <br /> <br />Expected Annual <br />Number of <br />Floods by Flood <br />Depth <br /> <br />Default Flood <br />Estimates <br /> <br /> <br />,a~E~,;'tQ~~~~D;~~~I;\1:t',i,;:"..'Y~~fP,1'\'i:" ' <br />""""Estuuate""""" """Esbmate"",,,, , <br /> <br />.1J~~!?:~'~~~;}1~~.\...~tt~~~~~~~, <br />, ~'''''i,'j'F"6,\'0-',"-,~ <br />,",p:f"." ,~~;t'!(lc ..' 'J;,;;1I!;~~~"'ci~'d <br /> <br />The default estimates ofthe Expected Annual Number of Floods of <br />each flood depth from -2 to 18 feet are shown in the ORANGE <br />(Default) column. These estimates are calculated from the flood <br />frequency, discharge and elevation data entered previously. "Expected <br />annual number" of floods does not mean that this number of floods <br />occurs every year, but rather "expected" indicates the long term <br />statistical average number of floods per year. <br /> <br />The default estimates of the expected annual number of floods at each <br />depth are shown in scientific notation because these numbers may vary <br />over an extremely wide range, including very small numbers. For an <br />explanation of scientific notation, see the Technical Appendix to this <br />chapter, page 7-7. ' <br /> <br />Except when annual probabilities approach one, the expected annual <br />number of floods and the annual probability for each flood depth are <br />virtually identical. <br /> <br />For a LEVEL ONE analysis, these default estimates of the expected <br />annual number of floods at the site under evaluation should be used. <br /> <br /> <br />7-5 <br />