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<br />SIMONS, LI & AsSOCIATES, INc.
<br />
<br />eXEcrJTIVESUMMJ\RY
<br />
<br />4105 EAST FLOAIDAAVENUE
<br />SUITE 300
<br />DENVEA. COLORADO 80222
<br />
<br />TElEPl-tONE (3031 592-0369
<br />
<br />OctoOO.1B,1<J82
<br />
<br />This report presents the reaults of the flood plain infQ~atlon. drainage
<br />plan, and street improvement plan for the ~~n of Milli~en, Colorado. The
<br />report ~~a prepared for the Town of ~llikon and the Colorado Water
<br />conservation Board to serve as a guide to street and drainage improvements and
<br />general development in Milliken. Included is the basic data used inhydrolo-
<br />gic, hydraulic, and economic analyses to ~fine the drainage situation as well
<br />as alternative solutions to the assocIated flooding problems in town.
<br />Analysis of the various alternatives produced a recommended drainage improve-
<br />ment plan including an Lmpl~mentation procedure. ~ preliminary ~treet impro_
<br />vement plan coordinated with the drainage improvement plan i5 also presented.
<br />The 'l'o"", of Milliken (270aores) ie located at the rec"iving end of a7.'
<br />s~uar" mile agricultural drainage basin. Runoff from the basin p4sses through
<br />Milliken in three locations enroute to the Big and Little Thompson Rivers.
<br />These three locations ar<l theWeeternPlo"l'athwhichlltartaneart heaouth_
<br />
<br />Ms. Nora Schiferl
<br />Milliken Town Clerk
<br />1'080><97
<br />Milliken, CO B054~
<br />
<br />Re,
<br />
<br />"Plood Plain Information, Drainage Plan and Str....t Improvement
<br />I'lan at Milliken, Colorado"
<br />
<br />Dear Ms. Schiferl:
<br />
<br />In compliance with the contraotof February 10, 19S2 between the 'l'own
<br />of Milliken .ond Simons, Li & AsSOCiate", Inc. (SLI'l) ,.., have <."Ompleted
<br />a detailed drainage lItudy of Milllk~n, Colorado and the aSlIociated
<br />drainage basin. Tranllmitted herewith are fifty (50) copies of the
<br />final.report "Flood Plain Information, Drainage Plan and Street
<br />Improvement Plan at Milliken, Colorado" which presents our analysis
<br />and recommendations for drainage and etreet improvements in Milliken.
<br />Detailed data and methods of analysis ar.. contained i~ the ~chnic~l
<br />Addendum ..hich along with "Drainage and Street Design Manual for the
<br />Town of Milliken, Colorado" will be shipped ~der separate cover.
<br />
<br />~est city li~it and rune to..ard the elementary school, the Lola Park Tributary
<br />begins just south of t.ola Par1< and rune north between Irene and Joeephi n..
<br />Avenues to the LitUe Thompson Rive,.., and the East..rn Flow Path follO'n's County
<br />Road 2~ to the Thompson and Platte Ditch. Natural drainage throuqh tow~ h
<br />hindered by roads, railroads, Irrigation ditches, ~nd buildings. Of thes..,
<br />th~ C~lorado State Nighway ~O, Great Western ~ilroad, and onion Pacifio
<br />
<br />We ..ish to acknowl..dg.. with thanks the input and cooperation of the
<br />T"ChnicaleomroltteewhichincludedO. flandolphSe"hol",andLarryl".
<br />Lang of the Colorado Water Conllervation aoard and Charl..e Martin, Jim
<br />Gramling, Leroy Martine~ and JiM Adkisson representinQ th.. Town of
<br />Milliken; Mervin Martin, Milliken'a Mayor, ~yle l'ackarct-Seeburq..r,
<br />Town j\\,mager, th.. r..maining _!'\b..rs of the to"", oouncil and th.. people
<br />of Milliken, W.. enjoyed working ..ith yOu on this most ohallenging
<br />"tudyand look forward to the opportunity to work with you again.
<br />
<br />Railroad ~nkments are the greatest obstructions.
<br />
<br />Intenss thunderstorms
<br />
<br />Sincerely yours,
<br />
<br />over the basin producing heavy runoff have result..d in severe flooding in
<br />Milliken in th.. past, particularly in the SUmmer of 1~8' and '982.
<br />Nydrologie analysis wa.. performed to deterMine peak flow rates a~d flood
<br />volumes at various points in town for selected storm frequencies. The Storm
<br />water Management Model (SWMMl wa" used to model 2-, 5-, 10~. 25-, 50-, '00,
<br />
<br />~::-t.::t7
<br />Vice President
<br />
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<br />and S~C-~'c~r !rc't"-e,,c:,. ctor"'~ o..'er ::''1.e l:).1,~t;\ for .udaLi"." a,w y.",r 2000 i>o.s,-n
<br />
<br />conditions.
<br />
<br />OM/de
<br />D-8/R:20).1
<br />
<br />~he r..sults of hydrolo1ic analysis wore us..d in hydraulic analyei$ as
<br />lnp\lt to th.. U,S. Army Cort's of Engineers' NEC-2 ~...ter $urhce profil" eo",-
<br />putar ..,,\<,1. Thh provl"e,\ "st1..ateo of the wat"~ ..ur!aa~ elevations fo~
<br />floods of the v..r1ous !requcncies in Milliken. The .....t..r surfac@ pr0files tQr
<br />th.,. <trainage"...ys were tunsferred to a topoq-raphi" map ('''_200',t .."-f00t
<br />
<br />~c: D, R...ndolph SeQholm
<br />;:"closur'"
<br />
<br />fORT COL1.INI HU.DOUAATERI: POST O~~ICE BOX 'a16, mRT COlL'NS, COLORADO 110622 ,303) 223-'100
<br />TUCION OffiCE, ':/0 W BROADWAY SUIT!' 2M P.O BOX 27'~ TUCSO". "R'ZO"" a\102 i6M'~M."';"<
<br />CHEYENNE OffiCE; \780 W~STLAND ROAD, CHn~"I'I~, WYOM'NG82001 !301) i\,14.N7~
<br />PITTS5URQH Of'ICE, '2' f'ELO CLUB ROAD. ~tTTSB'JFlG>j, P~NNSVLVANIA 15233 (~'2) 96J.0711
<br />
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