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<br />!ITEM? <br />HNdii <br /> <br />Table 3 -. Analysis of Flood Control Improvement Options <br /> <br /> <br />FC.] <br /> <br />Incr.... Rill. G.p <br />Reservoir's outlet <br />works capacity <br /> <br />FC.S <br /> <br />Ch.nn.liz. Rill. <br />Cr..k or build Ilood <br />levees <br /> <br />Outlet works capacity would be <br />increased to allow for higher <br />releases in anticipation of flood <br />flow.. <br /> <br />Design flood control measures <br />lor Rifl. Cr..k thru the <br />developed areas outside of and <br />in the city of Rifle. <br /> <br />., :":""':'::':':";::'::::;::,:.::::":'::;:: <br />,'FAtAl?; <br />\ifuAW~i <br /> <br /> <br />::::::":::':-":':-:'::_;:'",:': <br /> <br />The most damaging floods <br />along Rifle Creek are the <br />result of high-intensity, <br />short-duration summer <br />rainfall. It is unlikely that <br />there would be adequate <br />notice to release sufficient <br />flow & vacate enough <br />space in the reservoir to <br />provide an effective <br />solution. <br /> <br />Estimating costs would <br />require 8 detailed design <br />which has not be <br />completed since this <br />option does not appear to <br />be effective in solving the <br />probl.m. <br /> <br />Oetailed study would <br />determine the <br />effectiveness of flood <br />control measures and if <br />measures would be <br />economically justified. <br /> <br />Not estimated - requires <br />d.tailed .tudy. <br /> <br />28 <br /> <br />- Exi.ting capac~y I. 350 cIs @ m.x pool <br />l.v.1. 310 @ .pillw.y cr..t. <br />- This option would be used in the case <br />where reservoir space needs to be evacuated <br />quickly &. minor downstream flooding is <br />better than the damage caused by much <br />high.r pa.k Ilow.. <br />. S..ed on the 19S6 Flood Inlorm.tion <br />Study, disch.rg.. .xc.edlng 310 cIs should <br />be within existing channel capacity. <br />- This would require a costly major <br />modification including cutting concrete, <br />installing new gate &. bulkhead &. upgrading <br />hydr.ullc ayat.m. <br />- This option would be most valuable when <br />the reservoir level is at the 8 iUway crest. <br /> <br />- No analysis of flood control has been done <br />by Corps 01 Engin..ra (COE). <br />. Local government (city, county) could <br />initiate a study in cooperation with COE <br />(S.ctlon 205, 1948 Flood Control Actl. AI.o, <br />COE h.. propo.ed a Color.do R. .nd <br />tributaries study for Congressional funding. <br />- Flood Insurance Study (Jan. 1986) contains <br />info on flood discha as. <br />