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<br />f <br /> <br />r-r- <br />i i LONG TERM DEFINITION <br />~j i - ,-, ((~,/- f- <br />I ' , .1- , -, f' ,.... f ,. -' <br />-,,1'" . i -.. i -!. . - -/.r,;- <br /> <br />. Related to IOO-yr single event risk (22 <br />percent in 25 year period) <br />. Related to limitations in analytical <br />procedures and reasonable extrapolation <br />over time <br />. Reasonable definition of long term <br />assumed to be 25 years, <br /> <br />OUTLINE OF ANALYSIS <br />,-APPROACH t <br />-, , I'"'^" I <br />' roo' :" - <br />.-1'-__- - i J: -J-, J ,.....; - / .--,;_ ___.. <br /> <br />. Eru>l"r "nd Fhx,J Risk <br />. General Analysis Procedure <br /> <br />GEOMORPffiC ANA~)'SIS <br />. - r . /. , <br />f.' ,...., - , <br />; -I J; -' <br /> <br />'. <br />-i -n <br /> <br />f _"__ <br /> <br />. Objective is to identify and understand <br />key factors that govern vertical and lateral <br />stability. <br />. Field inspection critical. <br /> <br />. Regionally appropriate geomorphic <br />analysis techniques can provide significant <br />quantitative results <br /> <br />IT <br /> <br />. , <br /> <br />, <br /> <br />DEFINITION OF <br />,..!.!PRUDENT" ,t. <br />, I 'Je<'J <br />_r-.-.lf--.r!j" --,J <br />~ ,-,r'~ __.. <br />. Limit risk associated with single event <br />flooding or erosion, and cumulative <br />erosion over time <br />. Boundaries of erosion and flooding buffer <br />zone defined by worst case envelope of: <br />- flood boundary or sbort or long term erosion <br />- flood boundary or sum of sbort and long term <br />erosion <br /> <br />._r' <br /> <br />rrOVERVIEW OF ANA~SIS <br />--: ,... I.r ! jeI I - <br />__;__- j _1'-., -.:! !--i.' .-l - J <br /> <br />-,-,! --_.. <br /> <br />. Use of available data. <br />. Application of geomorphic analysis <br />techniques. <br />. Application of sediment transport <br />engineering analysis techniques. <br /> <br />l)~~~5t!;'j\G <br /> <br /> <br />.; '-'l___. <br /> <br />. Short term analysis based on I()().year <br />event. <br />. Long term analysis based on <br />representative annual flood that can be <br />extrapolated in time <br />