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<br />jlCON <br />ENGINEERING. INC. <br />7'Ol\'B 5cvtl1 A~on \...'"",E"3:~WOO<J, CO~O>~ f'hon<.30j-ccl'o,o,oc Fd" :JOj-cc'-1OI9 <br /> <br />MayS,1998 <br /> <br />Mr. Bryan Kohlcnbcrg <br />Urban Drainage and Flood Control Distrkt <br />2480 Wcs\26lh Avcnuc. Suite 156B <br />Denver,COSO::!l] <br /> <br />Mr. Tom Browning <br />ColotadoWaterConservationBoard <br />1313 Sherman Slr~"l <br />Room72l <br />DenvCf.CO S0203 <br /> <br />Sulljed: South Plane Ri\'er Channel Cal'acit~' Anal} ,is <br />ICOr>iJoh;'>;umuer: 97-020-016.415 <br /> <br />Dear Bryan and Tom: <br /> <br />!COK Enl(inccring, Inc., is pleased to submit the <lnnched report enlitkd Sllwh Plaue Riwr Channel <br />Capacity Analysis, dated Murch 1998. <br /> <br />We would like to ackn<,,,,'Icdgc the help;rnd support in the preparation of this report that was fl.lmishcd h)' <br />your swrr aJH.llh~ project sponsors. In p:u-:iclllar, Ken MacKenzie of yow Slaff have been instrumental in <br />pro~iding input. <br /> <br />This study is intemkd to provide thl' spollsors "lth a current conditions analysis of the 50\lth Plalte River <br />fwm Hampden Avenue upstream t<;> the Bf<);\TI Diteh Diversion at Coal Mine Ro.w (extended). The results <br />of ,"or ~,,~l~'<i, i"dir.'r.' th.,t in the reach of the Corps of Enginc'<':rs project area. the current ehannl'l has <br />adequate capacit) to convey the lOO-}'Car slonn n"ws. as "dl a:; a sustainc;! rekas..:: of 5.000 cfs fr(ltn <br />Ch:Hlidd Reservo;r. l"his upJ<lk'd moJeI h:ls t>een calihrated to the current oonditions using high water <br /> <br />mark dala collected during the Slimmer of 1997. Manning's "n" values were detennin<:d for the channd <br />bonom andchanncl bank area,. TheManning's"n"valucrc!"JrthasheenfonvardedtoYOllunJerscparale <br />cover The resulting modd also accounts for challges to the channel designed and built by the Corp.' of <br />Engineers as a result ofs.:dimentation. degradalion. and volunteer growth of trees and willov.'s. <br /> <br />\l/e have enjoyed working with you throughout th~ prcpatationoflhisstudy and arc available to as,;istYOll <br />with any additional need, you nUl~' have in re~ard to this study. <br /> <br />Sincerely. <br /> <br />ICOi'i ENGINEERI:\G, I:"IT. <br /> <br />tL:J~l.Li~ <br />DouglasJ. Williams,P.E. <br />Principal <br /> <br />~~ <br />CralgJacobson,E,I.T. <br />Project Enginecr <br /> <br />/dp <br /> <br />Allachmcllls <br /> <br />ce:file <br />