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<br />Road, a oounty road at reference point 35^, ano Arapa~e Road, <br />All roadways in the study reach will beovertoppl;d by the 100- <br />year flood at 50~ point along the ro~dway exc~pt Colorado State <br />Highway 86, <br /> <br />Obstructions such as trees and bulldin<)s do exist on <br />the flood plain In the study reach. The obstructive eflect is, <br />however, relatively insignifIcant because of the sparsity In <br />number. <br /> <br />velocities of Ilow - Water velocities durIng lloods <br />depend upon such factors as size and shape of the cro~~ ~octjons, <br />conditions of the stream, and bed slope; all 01 these factors <br />vary on different streams and at different locations along the <br />samestrearn.OnChcrryCreckinthestudvreach,thechannel <br />velocityfortheIOO-yearflood, Ingenoral,rangeslroo5to 15 <br />feet per second and averaqes about 9.5 feet per second, The <br />overbank ve locltv lor the IOO~vear flood Ii kp.wlse ranges from 2 <br />to 6 leet oer second and averages 4.5 feet ~r second. <br /> <br />Rate of rise and duration of llooelnq - ~ate 01 ris~ <br />and duration o' flooding, for 'Iood~ comnarablc t~ a IO~_yo~r or <br />:;>OIJ-yeartlood,canvaryoverawiOeranqe, i'.tlooootrainrall <br />or I'J I n on Cherry Creek wou I [1 peak I n ,,,,n rox I mate 1 y 3 hou rs a t t~'e <br />~pstroam study limits and in approximately 4 hours at the down- <br />5tr"'<lm I iml ts, Th" peak dl ~char'le at the upstream I i."lts Is due <br />to floodwater fram the upll<lr ba51n "hi Ie th~t in th" lo""r b,~sln <br />is due mostly to floodwater from the lnt",rvenin'.l dr"ina'.l9 "rea <br />betweon the upstroam and downstreal"1 limits. The tlood waV9 would <br />have a duration of approximately 9 hours at theuostream limits <br />and approximately 12 hours at thedown<;tre"m limits. Th"averago <br />oeaklno time for the study reach is about 3,5 hours dnd thn avnr- <br />~'le duration of f I codi n'.l i ~ "bout I 0 h<1ur~. <br /> <br />" <br />