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<br />STATE OF COLORADO
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<br />Colorado Water CUll5ervatiu" Buard
<br />Department olNa/rlnd Resources
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<br />,"'"~USI 9. 2000
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<br />.\1r. BiIlD<:GrO<1t
<br />l.'rban Drainage & Flood Comrol D,Slrict
<br />2480W,26"AwQu..Suit~ l568
<br />Denver,ColorJdoR0211
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<br />'Note: CWeB approxim.le nvdrolOl:Y guidelin"~ (1<)<)9) and USGS \llRI RepOrt 9<).4190 were us~'<.i,
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<br />Dear BiJl:
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<br />A:; you request~d. w~ have performed a ..vi~w of the WRC E.ngin~~ring. Inc, (WRC) ..port ~nt;lled
<br />"Outfall System Planning and Flood Hazard Area Delineation for Plum Cr.ek and Tributaries _
<br />Hydrology R~port" dated May 20()O. I appreclale you taking the time. alotlg w;lh Ben Urbana" John
<br />Doerferand Alan Leak to meet wilh me on August 8 in ord~r to prm'id~ an ov~ryiew oflhe sludy.
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<br />in g<;n~(al, thc C\VCB cndor,~, the u"" of CV!1P/SWMM to dev~lop f1()oQ<j fW1U~[\':y information for
<br />walcrshed, within the Urh~n Drainage & Flood Control Dim;"t boundane" AI~hough an exhaustivc, in.
<br />depth rel'iew {)t' lhe hydwlogi.: an~lysi, and modeling dfor< for the Plum Creek study wa, nOI performed
<br />by [he CWCll. the assumptiQn, ,rld inpul param,'t~f' "enainly >~em re;!>onahle, For (!)ITIpari~0n
<br />pw-po'e~, lOO.ye~r pt:"k flow e'lim"[e~ for l""'~ of the sludy ,treams wcre computcd using twO separate
<br />regional rogre.sion equations. The results of the ~otnp"ri~on analysis are presented in !he table below,
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<br /> Pe"k Flow COlll arison
<br /> DA WRC aisl. Cond. 'CWCB lOO-yr ~USGS 100-
<br />Slream ;-'::rni) II~)- 'rllow (ets) tlow(efsl vrllow(ci's)
<br />We.t Plum Creek al Plum Creek 134.9 17.695 22,980 , 11,000
<br />larreCrcekatPlumC..ek 52 1,642 2,880 , 3,109
<br />IndianCleekatPlumCr~ek 16,7 6,217 6,060 I 4,890
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<br />The CWCB fmd. lhe ,,'erall re"ult' of the WRC .<Iudy [0 tx: ""cept~bl~, The eWCB ddJnilcly ,upports
<br />tbc use of the futureeondit;onl flood hydrology and tloodpla;n del;neat;on, for this project. Thefulurc
<br />.:onditjOlt, peak flow valu~, for tlie 1 % eh.nc'c (loo-year) evenl, On Ih. ,tudied ,tream, are within !JOg.,
<br />of Ih~ eti,ting ~onditjon. peak now valu~, ~i reportod by WRC. Plea,e let me know if I can be of any
<br />furrher aisi~t.lncc ()(\ this proje(l,
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