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<br /> I <br /> I <br /> I <br /> i <br />I <br />, <br />i <br />i <br />, <br />I 300 <br />I " " <br /> ~ ~ <br />I ~ ~ <br /> ~ ~ <br /> 0 0 <br /> 0 <br /> 250 <br /> <br />200 <br /> <br />- <br /> <br />100 YEAR* DAMAGES <br />=$130,010 <br /> <br /> <br />- <br /> <br />~ <br /> <br />- <br /> <br />AVERAGE ANNUAL FL 0 <br />IOAMAGES. S 5.000 I <br /> <br />~ <br />~ <br />'" <br />~ 10 <br />. <br />~ <br />o <br />o <br />o <br />o <br />~ <br />~ <br /> <br />10 <br /> <br />20 <br /> <br />PERCENT PROBABILITY <br /> <br />CLEAR CREEK-YQUNGFIELO THROUGH GOlDEN <br />FLOOD DAMAGE PROBABILITY DISTRIBUTION <br />REACH :3 MciNTYRE ST. TO YQUNGFIELO ST. <br /> <br />_JIGURL1ZJ: - 3 <br /> <br />SECTlON>'ll <br />STRUCTURAL CRITER1A <br /> <br />INTRODUCTION <br />The design criteria utilized for tnismaster plan are based all thusecon. <br />tained in the Denver Regional Council of (iOverrwnents' Urtnll Storm Drainage <br />Criteria Manudl (Reference 32). Kowever, due to the steep gradient, large <br />sizebedmateridl, and the bridge structures at Ford Street and Washington <br />Avenue, exceptions have been rnade witn regard to <lllowab-leoverbank depth <br />anda_eragevelocity. Specific planning and design Cfiteria applicable to <br />Clear Creek-Youngfiel<l tnrOllgllGolden are the following: <br /> <br />L GRASS-LINED CHANNELS_ Design will g..nerally be based on Channels Ilaving <br />natural waterwayhydrdulic and appearancecharacterls,tics,. Tneyshauld <br />beaes,theticallydesigned to the local envirorroent dod should provide <br />multipurpose benefIts such dS recreatlondl uses where applieable_ <br />specificcrit+:!riainelude: <br /> <br />o 100-year design overbank depthS would be approximately 10 feet in the <br />vicinity of Ford Street ano l4ashington A'IE1lue, and\'oQul<l a_eragebe- <br />tween 5 and 7 feet upstrei1l\to U.5_o_ <br /> <br />o A m~x im..'1 a,,,,ra~e design ','elee;t}' ef g.O to ! 2.0 f.;et per ~f'<:ond <br />(fp,) for the lOO_year storm. Riprap prot",ction would be required at <br />critical area~ WCIl as the toe of ~lopes_ <br /> <br />o 4: 1 channel ~ide slopes, however, wMre developnent ex ists and r Ight- <br />of-way is a probll:Jll, the slopbmaybe3:1. A2:1 slo~miJstbe sta- <br />b J 1 i~ed by r Jprap protection. <br /> <br />o Freeboard no le,s than 1.0 foot. <br /> <br />30 <br /> <br />a Grass co.er chosen for hydraul ic r~tardd~ce, i _e., resi ~tance to <br />s.cour forces. and ~a<,e of 'TI<lintelldnc,,_ <br />