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<br />r <br /> <br /> <br />40 <br /> <br />... <br />Ql <br />Ql <br />..... <br /> <br />FB= flood bar wi >12" boulders wllichen <br /> <br />-bedrock <br /> <br />wall~ <br /> <br />30 <br /> <br />.... <br /> <br />c: <br />o <br /> <br />20 <br /> <br />colluvium <br /> <br />~ <br /> <br />PSI rang <br /> <br />...t....... ............ <br /> <br /> <br />HWM s-o.ooa <br />n-O.035 <br /> <br />ft/ft <br /> <br />... <br /><Il <br />> <br />Q) <br />W <br /> <br />10 <br /> <br />thick <br />(grey, <br /> <br />colluvium I <br />silty IO~ <br /> <br />D... .... .u.....u....,..... <br /> <br />o <br />o <br /> <br />50 <br /> <br />100150200 <br />Stationing, <br /> <br />250 300 350 400 <br />feet <br /> <br />3, Cherry Creek upstream from Castlewood Canyon about 6 miles south of Franktown: a,) <br />Photograph showing upstream view of paleoflood reach with left bank bedrock outcrop defining <br />the cross section shown in fig, 3b; 3b,) graph of channel cross section. The highest paleostage <br />indicator is constrained by uneroded, old colluvium, and a flood-deposited boulder bar (-250 x <br />100 x >10 feet) with surface boulders up to 2,5 feet in diameter, Boulders up to 10 feet in <br />diameter on the floodplain, from rock fall off canyon walls, are available for transport, but <br />flood flow competence has not been sufficient to substantially move these large boulders, The <br />range of peak discharge is 12,400 to 20,000 ft3/s, <br />