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<br />42 <br /> <br />ALLUVIAL FAN FLOODING <br /> <br />MOUTH OF' .--...: <br />CANYON..-/ ..; <br /> <br />195Z Flood <br />nepos it.. <br /> <br />o <br />, <br /> <br /> <br />""'I..f.S <br /> <br />'t':f DEBRIS ~LOW <br /> <br />.. MUD FLOW <br />./ <br /> <br />NORTH <br /> <br /> , <br /> , <br /> , <br /> I , <br /> , , , / <br /> I t ' , , I <br />() \ I, I <br />~ , I . I <br />.... I <br />~ \ I' <br /> , I' <br />~ \ , I , . <br />~ , I I I <br /> "1 <br />. I I I I , I ~ , <br />~ t, \ <br />'l.. I , I ~I t <br /> , I, <br />~ ' , <br /> \ / " + <br />~ \ I , <br /> \ \ 'f <br />~ <br />~ \ , <br />;)l \ + <br /> I <br />~ I <br /> I <br /> I <br />CASH BAUGH \ <br />RANCH <br />U.5.6 <br /> <br />f <br />I <br />I <br />I <br />, <br />\ <br />I <br /> <br />FIGURE 2-6 A 1952 debris flow flood on Cottonwood <br />Canyon Fan, California. SOURCE: Reprinted wilh <br />permission from Beaty (1963). <br /> <br />completely overwhelm the pre-existing channel system and topography offans and create new <br />pathways that are impossible to predict in detail. <br /> <br />Flooding on Composite Fans <br /> <br />Composite fans are subject to both streamflow and debris flow flooding. The relative <br />importance of each varies between fans, between positions on each fan, between individual <br />