<br />DAMAGE ASSESSMENT
<br />
<br />Direct dJma~es are tilo~e damage, which occur to the stru(:ture and its' co~tent only,
<br />
<br />Th~ ;tuJj Me" waS diyided into ~il1e (9) n=od,~, ac(u"Jiny to lIl~ S~VIJt vf '~ork.
<br />These reaches are defined as follows:
<br />
<br />,
<br />"
<br />1,
<br />),
<br />,
<br />5,
<br />6,
<br />),
<br />D,
<br />9,
<br />
<br />and are Cd 1 eulated based 011 flood depths. Indirect damages are tho~e dama~es ...hieh
<br />include the cost of lost business and services during the timeofcl eanupandre-
<br />pa i r. Some of t~ese indirect damages i~clude: The loss of sale" loss of units,
<br />
<br />Confl uenee wi th Cache La Poc;dre R her up~ tream of Timber 1 ine ~oad.
<br />Timberline Road to LeMay Ayenue.
<br />LeXay A~enue to Stover Street.
<br />Stover Street to College Avenue.
<br />College Avenue tc C~S Rail road.
<br />etS Railroad to Shields Street.
<br />Shields Street to rlewMercerCanal.
<br />Nel'i Mercer Cdnal to Pleasant '1alley and lake Cafid1.
<br />Pleasant Valley and lake Canal to Korsetooth Road.
<br />
<br />lo,saftdXr€venues, loss Of intl'rest on disaster loans, lossoftrdnsp;lrtation
<br />
<br />rO.lte" th~ cost of flood fighting and pol icing along wi th rel ief acti yities ~nd
<br />
<br />healtMservi(e,. Also included in indirect damages isa cost for inconyenicncedue
<br />
<br />to lost public services. Indirect da~ges are very difficult to identify and esti-
<br />mate and were based on percentages of property yalues as presented in Reference 22.
<br />These percentages are thirty-five percent (35%) in corrmercial or light industrial
<br />
<br />The object of this evaluation is to identify the average annual flood damage poten-
<br />tial within each study reach. Through the construction of channel irnprovements,
<br />
<br />these damages CM ~e ellmlnated or greatly reduced and iir'e the ITldJor benefit re-
<br />
<br />urc"~, Jrrd f: fteen ;:crcent (1St) in res i clentia 1 areas.
<br />
<br />sulting from the drainageway improvement.
<br />
<br />A detailed hydraulic analysis was conducted, resulting in deter~ination of the
<br />yelocity, width and depth of flooding for' the 2-year, 1G-year, 25-year, lOa-year and
<br />SOD-year flood events. Potential flood damages for structures within the study redC~
<br />were estimated using damage cu~~es de~eloped by the Federa 1 lnsu.ance ,~dministration
<br />(FIA) (Reference 22) ~nd cur~es dl!veloped at Color~do State Ulliyersity (Rl!ference
<br />2 3j . These curve~ taDul area darrlage dS a percent ot tou] structure va I ue cased
<br />
<br />Outlined ill Table 9 is dalllage cune inforoation for each reach with cOrm'erchl light
<br />industrial aile: residential properties calculated separately. The effects of high
<br />
<br />velocities, which inr;rl!asepotential damages, weretdken intOdcc ount where appli-
<br />
<br />cablebyaddingthpl'elocltyhcadlotlLl.'uepthofrlowatastruchre.
<br />
<br />Property Yol ue infOf'lllation was prQ~ idl!d by Shannon & Associates Real Estate Apprais-
<br />1:'1'$ Jr.d Co~~ulta~t~ (Reference 21). This information included a rictodal ~,~oy on
<br />~evera 1 reac he~ ~ 1 orlg the study reecho For each reach, s tructc;re~ and property
<br />within the flOOdplain wp.re identified and appraised on a dollar per square foot basis.
<br />Adetailedsurmlaryofthi,informatioTl i, included in the Technical Addendum.
<br />
<br />upurof1ooddepthabQve the structure's ground f100d level.
<br />
<br />FrOITIficldinvestigatior>s, fir,tf1[)urelevotionsofstrllcture,withinthefloodpldin
<br />were estimated in relat.ion to 0,1' adjacent ground. Strc;ctures loavin!J basements l'oel'e
<br />al so ide~ti fied. In addition, fronl these field visits, eleyation of mobile ,omes
<br />
<br />A graphica 1 displaY of J~erage dnnua 1 damages determined for each reach is presented
<br />
<br />f~ fi~ures 7, 8 ~~d 9. The ~~e" urder the curves rpprp<"nts tlw av"r'~" ~nn"al
<br />
<br />atove adj acent gro~nd '~'eo'," est im.ated. Sto.uctures within the f1 oodplain incl ude:
<br />a~proximate]y ninety residentia I bui ldings; one-hundred and thi rty mObile nomes;
<br />
<br />darnage po tential in do 11 a r~ per year. These fi gures show tna t pot~n t i a 1 damage 1 S
<br />minirr,J. 1 for the 2-year event in a 11 reaches. Significant dar<lges for the lOO-y~ar
<br />
<br />fifty-one Imits ~'ithin ~N).t"'ent bJildi:lgS. condomir.ic;,"s and to.;r,horr:es; thirty-tl'oo
<br />co~"'ercial structures; ~ix grain ele,'ators, a tr~e n~r$cry '-\lld a po~'cr substation.
<br />
<br />"~ent o(~ur, in r>'ilcMf's 2, t. ~nd 8. rlo d.1lllages occur in Reach 1 fer J 11 floQd c.'ents.
<br />
<br />Ave-aqe a;H!l<al ddmd'~es dele,.~.ined (or ea~h of the nine rPdC.~"S ,lnd for the St,Hty ar""
<br />
<br />as d woolI' are presented in Table 10.
<br />
<br />-34-
<br />
<br />,35
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