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<br />Ro~d, ~ county ~o~d ~t ~efe~onco point 35A, and A~Jpa~e ~oad. <br />All ~oadw~ys in tho study ~each will be ove~toDped by tho 100- <br />year flood at ~ point ~Iong the ~o~dway oxcopt Colo~ado ~tatp. <br />Highway 86. <br /> <br />Obst~uctlons such as t~ees and bui Id In<JS do "xl st on <br />the flood pia in in the study ~each. The obstructive effect is, <br />howovo~, ~elatlvcly Inslgnl f Ic~nt because 01 the so~rsl ty in <br />numbe~ . <br /> <br />Volocitles of flow - Water velocities during floods <br />depend upon such factors as size and shape of tho c~oss sections, <br />cond itions 01 the st~eam, and bed slaDe; a II of these factors <br />vary on different st~e8~s and at different locatinn~ along the <br />samo stream. On Cherry Creek in the study roach, tho channel <br />velocl ty for the iDO-year flood, In gone~al, ~anqes from 5 to 15 <br />feet per second and averages about 9.5 feet per second. The <br />overbank velocity for the lDO-yna~ flood likewise ranges from 1 <br />to 6 fee1 per second and averaqes 4.5 feet rer second. <br /> <br />R"t.. of ~I S<l and duration of f lcodinn - 'lah~ of ri SP. <br />and duration of flooding, for floods comra~able to a IOO-y"'ar or <br />500-year flood, can va~y ove~ iI wi de ~ange. ^ 1 lood of rllinfa II <br />origin on ClIorry Crook wuuld o"dk in dppruxlm,ot"ly 3 hour!'. dt tile <br />upstroamstudyllmltsand inapproximately.1hoursatthcdnwn- <br />st~eam I Imi t5. The peak discharge at the upstreilm limits is due <br />to f IQnrlwil-r-"r tt"orn tho "rr'''~ hllsln while th,.t in the lower bllsln <br />is due mostly to floodwater from the Intervening dralnago area <br />betwE'on t"'o IJp~tr",am ,.,n<1 d"wn~trflllm I imlts. Too f I cod wave wou Id <br />havo 11 du~ation of approximately 9 hours ot tho upstroilm limits <br />andaporoximatoiy 12 hours at thedownstrl)am limits. Th"avorage <br />pcaking time fo~ the stu~y ~each is 1bout 3.5 hou~s "od ~h" aver- <br />~ge du~atlon of f loodl n9 Is about 10 h<)u~s. <br /> <br />" <br />