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<br />'~/q%7'W& b I Robert If. <br /> <br />cr~ J7 <br /> <br /> <br />DEBRIS FLOWS FROM TRIBUTARIES OF THE COLORADO RIVER, <br />GRAND CANYON NA1'IONAL PARK, ARIZONA: exeCutIvE '.!UMAlit <br /> <br />Robert H, Webb <br /> <br />u.s. GEOLOGICAL SURVEY <br /> <br /> <br />Open-File Report 87~ <br />(( B <br /> <br />(l~e ~ ~t-f ~~~~ <br /> <br />~. 11 j;U~p '-u'<A -ck <br />~) w{;-~~ ~vQ 541ueJ <br /> <br />Prepared in cooperation with the <br /> <br />U.s. BUREAU OF RECLAMATION <br /> <br /> <br /> <br />Tucson, Arizona <br />September 1987 <br />