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<br /> <br />4 <br /> <br />FLOOD. JULY 3I-AUGUST 1,1976. BIG THOMPSON RIVER, COLORADO <br /> <br />41' <br /> <br /> <br />105" <br /> <br />HEYENNE <br /> <br />--fish_ ~ <br /> <br />r-I-" <br />~ <br />'~~. <br /> <br />g <br />l;bl' <br /> <br />,.' <br /> <br />'81J <br /> <br /> <br />RU5t'C <br /> <br />N'jnn <br /> <br />)~ <br /> <br />I, <br />I~ <br />l~ <br /> <br />L A R \1/ <br />~ <br />;{7 <br />/ ) \ <br />, <br /> <br />\" <br />'" <br />I <br />\ ..,' <br />l f ' <br />l' ) <br />""-. hm <br />I ,.}~~ <br /> <br />Base modified from U.S. Geological Survey <br />1:500,000, State base map, 1969 <br /> <br />10 <br />I <br /> <br />20 MILES <br />I <br /> <br />FIGURE 2.-Detailed location of flood area. <br /> <br />control on the surface-drainage network because many <br />stream courses generally coincide with faults. Almost <br />all stream valleys are covered by alluvium and slope- <br />wash material and the larger streams are bordered by <br />gravel terraces and colluvium. <br /> <br />The topography of the area is characterized by nar- <br />row valleys bordered by side slopes generally ranging <br />from 10 to 80 percent. Rugged rock faces of even <br />steeper slope occur at many locations along the canyon <br />floors and along the jagged ridges which rise as much <br />