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<br />. <br /> <br />f, rL~~GiT~~M D~~~~ON <br />r ,'" r. -r J" --' <br />- ; ! -- --: -, ., ;:. - <br />ro, 1 ~. -I ,. <br />f-'" , , t _ <br />..-.,- <br /> <br />. Related to lOO-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 tenn <br />assumed to be 25 years. <br /> <br />, <br /> <br />if OUTLINE OF ANALYSIS <br />I ' ,-APPROACij: (, <br />~r/. -1-_ -1 [, -i-II J '. '. I - <br />- i.,....,,-_. <br /> <br />. Ew,iol1 :tI1d FI(l(;d Risk <br />. General Analysis Procedure <br /> <br />Ii . <br /> <br />"SJ i ~~,~~Of~_~rj~A?,~~ <br /> <br />, ',' f__r_ <br /> <br />. Objective is to identify and understand <br />key factors that govern vertical and lateral <br />stability_ <br />. Field inspection critical. <br />. Regionally appropriate geomorphic <br />analysis techniques can provide significant <br />quantitative results <br /> <br />)T.-f ~~~(O}__, <br /> <br /> <br />1 """"l__. <br /> <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 defmed by worst case envelope of: <br />- flood boundary or short or long term erosion <br />- flood boundary or sum nf short and long term <br />erosIOn <br /> <br />" <br /> <br />Jrl~I~~J~; ~Fj~~~J~IS <br />_.r' - '1....; .{ <br />--'-'l_ <br /> <br />. Use of available data. <br />. Application of geomorphic analysis <br />techniques. <br />. Application of sediment transport <br />engineering analysis techniques. <br /> <br />J-rsEDIMENT ENGINEERING <br />I-ANALYSIS I- <br />, - I r'" J-,"'''J <br />' . , . --I I ,,' r - <br />,~, , i -1'-< - J -rt J I' - ,r <br />I ~ "...~r-_ <br /> <br />. Short tenn analysis based on lOO-year <br />event <br />. Long lenn analysis based on <br />representative annual flood that can be <br />extrapolated in time <br />