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<br />. <br /> <br />ALur\-UI.I'ANS IN CALlH)H.,\IA <br />ID.:NTIFlCATIO~. r.VAU:ATlO~. A~P CI.r\SSlnCA T10~ <br /> <br />. <br /> <br />Tile Stat~ ofCalifvmi. has dedicaled substantial financial and stalfl'e$OllrCC'5to id~ntify <br />and evaluate rivnine floodinll along the many thou"nds of miles of riven and str~ams <br />throughout California While much progreu has be~n mad~ in this aru. littl~ ha~ yel been don~ <br />to identify.nd evaluate potential 1100dlrlll on associatcd alluvial fan areu in theSt ale <br /> <br />. <br /> <br />This report !l\Jmmari.l:el the current informal ion regarding alluvial fans, propoiICS a <br />~tandard definition and base t1assilicalion sy~~m to be u~ in idenlifying and t1usifymg <br />alluvial fans throughout California, and makes recommendations regardins land uoe plannin!l,. <br />manll!!ement, and regulation (IfaHuvial fanare.as <br /> <br />. <br /> <br />BACKGROUND AND \lETIIOOOUlGY <br /> <br />RClulalion of Alluvial hnl <br /> <br />. <br /> <br />Alluvial fan, arc gently ,ulping landforms created over time by deposition of eroded <br />~diment (alluvium) at Ihe base of mountain ranllCll in arid and semi.arid r0:1Iion, !l\Jch as the <br />w~~tl'fn Uniled StatCS This landform is composed of It rea mIl ow and/or debris now !ledimenIJ <br />that kave lh~ !hap~ofa fan either fully or partially extended There are many alluvial fans <br />throughout Califvmia Som~ (Iflhe<ie faM have aclive flooding problems whick are nliOCiated <br />wilh dcn...e1y populated aren, potentially having a high risk of ,lIudural and personal properties <br />damage5andlh~poIcntiallo550flife OtherfansmaybccurrenllyinaL"h.e,activemsparilCly <br />populated or oon-populaled areal, fKltidenlified. ornol characterilcdwell enoullh to define the <br />degree ofl1ood riskl ..iIlUn'1 depictl an wial pholograpk onlle Magnesia Spring CanyoII <br />alluvial fan, a kigkly urbanized alluvial fan in RiversideCoollty.Califo rnia <br /> <br />. <br /> <br />. <br /> <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />Fillure I. '\lall:n...ia Sprinll Cuyon Allu~ial hn <br /> <br />I <br /> <br />. <br />