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FLOOD PROTECTION .MEASUR.ES TJ::.e town built an l~arthen le,vE!e in the 1960's t:o divert floodflows around the site (since reloca.ted) of the town's: water filtrat.ion plant. In 1986, the levee was extended to the north and west. The levee ties into high ground at the eastern end, but the extensi.on ends abruptly near the riverbank north of Nichols street. The t01:al length of the levee is approximately 3,300 feet. This study evaluates the effectiveness of this levee with respect to the lOO-yenr flood event. It also provides a plan for improving and extend:.ng the levee, where necessary, to provide 100.-year flood protec1:ion. Knnny Reservoir, on the Wh.i.tl~ River approximate,ly 7 miles upstream from Rangely, was comple.ted in 1986. The reservoir was not constructed for flood protect:ion purposes and would have no significant effect on the 100- and !;OO-.year open-water floods. It is pos,.ible that the dam would i.nhibit the formation of ice jams downst:~eam and could redu.ce the fr'aq1.1ency of ice-jam flooding at Rangel:r. FLOOD PLAIN KANA(;E:ME1NT I!E1~SURES The 100-year flood event is the, standard flood evel11: mapped by the NFIP. The NFIP is a Federal program that enables property owners to purchase flood insurance. It is based on an agreement betwee:n local communi ties and the Federal Government ,,'hi.ch states .that, :If a community will implemen1: me,asures to reduce fu1:ure flood risks .to new construction in Special Flood Hazard Areas (the area that vrould be inundated by the 100-year flood), the Federal Governnent will make flood insurance available within the community. I n general, Federal flood plain guidelines require that: new or substantially improved residences have the lowest habit:able floor (inclu:ling the basement) elevated to above the base flood elevation (the 100-year flood elevation). New or substantially improved commer:=ial buildings should have t:he lowest: floor flood proofed or elevated above the base flood elevation. A floodway includes the channel of a stream and that part of .the adjacent flood plain necessary to pass the base (10D'-year) flood without, increasing 3