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FLOOD09952
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Last modified
1/26/2010 10:11:13 AM
Creation date
10/5/2006 4:46:43 AM
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Template:
Floodplain Documents
County
Statewide
Basin
Statewide
Title
Application of Erosion Risk in Floodplain Mapping
Date
10/1/1973
Prepared By
Ayres Associates
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />,. <br /> <br />APPLICATION OF <br />EROSION RISK IN <br />FLOODPLAIN <br />MAPPING <br /> <br />rr f r r (J"(J'- <br />r I -1-.-.1 r -r, .' - <br />. ' , , I..r-_, <br />Peter F. Lagasse, Ph.D., P.E. <br />James D. Schall, Ph.D., P,E. <br />Ayres Associates <br />(rormerly RCE) <br /> <br />, <br /> <br />fT OUTLINE OF ANALYSIS <br />. ' <br />i ,-APPROACH ". <br />r.r~' J' -, j -I r ['" -r1 J ~( '..J - j ~,r-__ <br /> <br />. Erosion and Flood Risk <br /> <br />iiRISK ASSOCIATED WITH <br />E; <br />,.J ! ,... ~OO-iYR ~~~(_ .,' <br />.,.rl , i J-_) -.I r -Ij j " .-' -/ '.., <br />, .,..~r-_ <br /> <br />. In a 10 year period: <br />- 90 percent certainity will not occur... <br />- calculated risk of 10 percent in a 10 year <br />period. <br />. In a 25 year period: <br />-78 percent certainity will not occur... <br />- calculated risk of 22 percent in a 25 year <br />period. <br /> <br />T INTRODUCTION/. <br />! - I r ('J".r',.J- <br />! -"-.j - r,...r ' , - ..r <br />I' .....'1__. <br /> <br />...,i.r' , <br /> <br />. Origin of Methodology <br />- AMAFCA <br />- Calabacillas Arroyo <br />. Purpose of Methodology <br />- establish flooding and erosion risk boundary <br />- facilitate multi-use opportunities <br /> <br />, " <br /> <br />JTPR~~~ L~E,?~~y~Yf <br /> <br />I-~r' ' : _I-'j ,I i r_1 i J' -; ~,r-__ <br /> <br />. "Prudent Line" adopted to describe the <br />erosion boundary <br />. Relating "prudent" to an acceptable degree <br />of risk in an urban setting <br /> <br />~~r~~~~~, <br /> <br />i ~_'l_. <br /> <br />. 1000yr flood defines short teoo flooding <br />and erosion risk. <br />. Erosion can also be cumulative over long <br />term..,what is long teoo? <br />
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