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<br />PLMI FOR~.1ULATI(m
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<br />P1dn Selection
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<br />Alt~rnative ~5 is, therefore, tne reco~ll)ended i,~prQ'ier.Jellt pl~n for Spring Cre~k.
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<br />The benefit:coH ~,,~lY5i, ,!low, neg~tive or lHO benefits for .~1t€rndtives 41 - ,4.
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<br />TheseplJns, therefore, do not dppearto beeconamically feasible.
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<br />Det~iled Plan Description
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<br />As rrent ioneG pre" i ous 1 y, Jlo'....e'~er, t~ere i s ~n added {'conOlllic factor 0 f publ i C Sa fety
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<br />Flood impro"ements for this ~l ternati ye were designed to el iminatl1 3 major damJge
<br />areas. lhese IJ1iljor damage areas include the following:
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<br />downst re~II1 of exist ing roa<::way and rai 1 road e'~lbankmellts. Hie benefi ts, th~refore,
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<br />I.
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<br />Reach 2-Timberline ROdd to LeMdY Avcnlle
<br />Major dal1ldge5 would occur with inundation of the Poudre Valley REA, Inc.,
<br />substation.
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<br />for Alternathes #2 and #4 Me greater than those shown. 'tihi1e these benefits are
<br />difficl.llt to quantify and dre notesti"-.dted in this report, they do hHe a positive
<br />econoi'lic irnpact on ,he COIIIl'Unity dnd should be a fdctor used to ev~ luatc the> feasi-
<br />bilityofthealternativeo.
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<br />Reach 5 - {:olleqe Avenue to the Colorddo & Southern R.dilroll.!!
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<br />M~jor ~~~ngP~ w0uld OttUr duri~g floadirg of the ~bile home ~Jrk u~d
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<br />conmercial estdblish~e~ts in this reach.
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<br />In an; case, ,'<ltemJti"es n and .~4 provide the san"e ~enefits while the cost of ^1ter-
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<br />3,
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<br />Reach 8 - New Mercer C3n.'!J to Pleasant Vdlley & L-lke Candl
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<br />native ;;4 is considerubly 9r~dter. Thereforf', Alternative #4 is elirni~ated from
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<br />~Jjor damages would OCtur lo r~~idential uni ts in the vicinity at the Urak0
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<br />'~~rs.i dt'r'ot iD~.
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<br />RoadCrf!ssingofSpringCreeK,andtoresidential unitsinnllediatelyunstrea.
<br />of Tdtt Hill ~oad, and belo~' the Plea~~nt Valley (~nal.
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<br />rllt~I.Dcltjv~ ~5 i~ LI,~ "-lJ~t ~~ononi~,ll!y fcasi~le a.lterndtive enluated in this study.
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<br />,[hi Ie the p1JrI ,ices ~ot Cd!! for illlfl,ediatE ,'erooval of existing inadvertent de,e~t ion
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<br />The locdtion ,1nn tyo" of imnrovements (oven'd by .~lt~rnat ive i'5 dre show" cr. the
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<br />(~n I C5S emcankments are 5ho'~n to be un5ui table for d~t.a in inq flows), it does provide
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<br />drawing Sheets P-1 through P-5. Those improyements which are requirpd in Redch ~2
<br />dre described 011 sheet P-l. Thp e.isting cuhert at the Colorado" Southern Rail-
<br />rMd Is notddequate to handle the lOO-year undetcli"ed f10w of 5000 cfs. A ldrger
<br />concr~te box culvert WdS dC5igr.ed 4S a repIac~~ent. A bem wa5 designed to eliminate
<br />flooding at the power sLlb-station on the South Sank of Spring Creek dDWnstream of t~e
<br />iJniOnPdcitlCl<dllrOdd.
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<br />planning bdsed upon ultim<tte reno"dl of these fddlities. This plan addresses the
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<br />fact thilt I;,-,st of the potential damages occur in 1 short reaches of5pring Crl'f'k,
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<br />drld full floodplai1l i'lIp'.oveml'''ls in tl'~se a.n'~s are both economicdliy advisable dnd
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<br />des in~dbie. F1Qodpld in II,alld(!e"ellt i5 the" ut i1 i l~d to prevent further damdqe paten-
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<br />t idl in I,~"ily developing ilredS and to dl1evinte ex ist ing prool~m ~I-PJS (wpr d long
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<br />period of tlme. I,ith sllitdble attention to the safety of r<'sidents downstn'am of
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<br />f1oodr>l~ ill pI "nn i'l~ ~nd i",pro;l~"','n t.
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<br />Imj)rovcments through the mobile holl1€ p~rk (Redeh ~) ,\r~ detai led on "heet P-2. A
<br />grd,s-linedopenchanllel I'Idsde,ignel.lfurthi,redchtoconveythel00-yearunde_
<br />td i ned di seh~r?~ C f 4500 cf5.
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<br />existit~g jndJve~tc'lt det<:>rrtio~, this alter~i\tjve ~che::<f' i~ th", bpst dpproilfh to
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<br />-61-
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<br />- 64 -
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