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<br />RONALD C. McLAUGHLIN <br />KENNETH R. WRIGHT <br />HALFORD E. ERICKSON <br />~OUGLAS T. SOVERN <br />KENNETH ASH. M....N.GER <br />^iJPEN OP"F"ICII <br />P.O. 80): 2.810 <br />A."PI!:N, COl.O. !!llell <br /> <br />WRIGHT~MCLA.UGHl.,11'o1 El"'lIGINEE'nS <br />ENGINEERING CONSUL.TANTS <br /> <br />19 March 1973 <br /> <br />';OMPL.I,nt ENI)INRIUIING IlI[RVICf!:S <br />!N THF. .PItCI"',I-T'f P"lltl.O. OP" <br />W.TER lJ.UPPl.Y AND DI.TRlrlUTIOI'l <br />WATER AHO III:WA./i1l TIlfE^T""ENT <br />..WAQIt COI.LECTIOH ....NO FlI!IJ!III!: <br />INDUSTRIAL "..A.TI(. <br />II-rORN DR^INAGlI: <br />"L.oao CONTROl.. AND <br />C"'I~IUIl WATIIA.OIllII:NTI:D l""O.'Rc'"n <br /> <br />2420 ....l.eOTT j;TREET <br />DENVF.R, COLORI,DO aO~:ll <br />(303) 4!1/J-S201 <br /> <br />Mr. L. Scott Tucker, Executive DIrector <br />Urban Drainage and Flood Control District <br />600 Lucas Building <br />181 East 56th Avenue <br />Denver, Colorado 80216 <br /> <br />Gentlemen: <br /> <br />Re: Big Dry Creek Prel iminary Design <br /> <br />The report entItled "Big Dry Creek Preliminary Design" In two volumes <br />is attached. The ass Ignment was undertaken h ac:;ordance with the agree- <br />ment dated April 25, 1972. The preliminary deslg-) was done for a drainage <br />basin covering 86.3 square miles and a channel reach of 110,600 feet. <br /> <br />In addition to this report, we have previousiy prepared and submItted to <br />your office a Phase A report entitled "Urban Storm Drainage. Major Drainage <br />Planning, Big Dry Creek," dated October 15, 1972. In many ,-espects the Phase A <br />report I s a compan Ion to th I s report as I t was a i;ey step I n the thought <br />process by which the prel imlnary des ign approach ",as determined. Some of the <br />Information presented In the Phase A reqort has been lifted and amplified in <br />the attached report for Phase B. <br /> <br />In Phase 8 the detailed hydrologIc studies, =Iood plain determination and <br />the various alternatives were re-examined to Insure that the numbers and the <br />concepts used during the alternate selection process were appropriate and valid. <br />The legal analysis, done under the direction of Mr. Ronald Strahle of Fort <br />Collins, Is capsullzed in the report, and the complete legal opinion Is con- <br />tained in the Appendix. <br /> <br />Nineteen plan and profl Ie sheets at a sCille ()f I" ~ 20Cl' have been pre- <br />pared and reduced to half size fo,. reproduction In Volume 2, In addition, <br />there is a drawing showing the draInage basin and sub-basins and two drawings <br />which have been reduced from a scale of I" .=. 200' that show the extens Ive <br />flood plain area In the vicinity of the Union Pac:fic Railroad and the County <br />Line Roado <br /> <br />After the structures, channels, drops, checks, and other appurtenances had <br />been "rough-s ized", the backwater prognlm developed during Phase fJ. was again <br />utilized to determine the flood water elevation as shown on the drawings. <br />The full-sized drawings will, of course" be placed on file ,,-ith the 1)lstrict.. <br /> <br />Big Dry Creek Is a unique study for the Denver Metropolitan RegIon In <br />that It Is preventative rather than con-ectlve In nature, which .aIIOl"s for use <br />of the flood plain from County Line Road to Standley lake as a broad green- <br />belt with Its attendant recreation and "esthetic benefits. Flood pldln <br />