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<br />", <br /> <br />. <br /> <br />. <br /> <br />" <br /> <br />..l' ,-: ,.... " <br />t! ,.. ,"" <br />........ ..J <br /> <br />Puehlo arca since possibilities for expansion of development in the <br />flood plain are limitcd. <br /> <br />91. About 31 percent of total benefits creditable to Pueblo Dam <br />and Reservoir \;Quld accrue to urban and suburban development. Benefits <br />to the Pueblo arca comprise about 68 percent of total urban benefits <br />although it alrcady receivcs a high degree of protection from Barrier <br />Dam and the Pueb 1 0 Fl oodway. The fl oOlh;ay has a capaci ty of 11 0.000 <br />c.f.s. whcreas thc standard project flood Hould discharge ~n cstimated <br />131,000 c.f.s. Flood control storage in Pueblo Dam and Reservoir would <br />provide additional protection sufficient to precludc flood losses to <br />Pueblo from Arkansas River floods of standard project and greater <br />magnitude. Accordingly, the projcct has hecn credited with henefits <br />for the additional protection of residential, business, and other urban <br />developmcnt from floodflows in the range of 110,000 to 131,000 c.f.s. <br />1I00;cver, floods of these magnitudes are so infrequcnt that the benefits <br />on an average annual basis amount to only about $11,200 even though <br />property in the protected area is valued at about $200 million. Thc <br />rest of the benefit creditcd the projcct at Pueblo comprises $96,000 <br />average UI1Dual savings from reduced mailltenancc anJ ext~nsion of lISeftll <br />lifc of existing protective structures as shown in tnblc 13 and $65,400 <br />repl'esenting damages l1reventeo to mlmicipal 'd;1tCl' \.Jorks faci litics up- <br />strcam from the city, <br /> <br />92. Similar to Pueblo, the city of Las Animas "ill be provided a <br />high degree of flood protoction "hen the authorized local protection <br />project is constructcd. The project design flood is 140,000 c,f.s. in <br />the Arkansas River Hith a coincident flo" of 20,000 c.f.s. in thc <br />Purgatoirc River. Thc estimated discharge of a flood of standard proj- <br />ect magnitude in the Arkansas River at Las Animas is 210,000 c.f.s. <br />Pueblo Dam and Reservoir has been credited with $7,200 average annual <br />benefits for reduction of damages from floodflOl;s exceeding the project <br />design flood. <br /> <br />93. Flood losses presently sustaincd in the La Junta area would <br />be rcduccd about 16 percent by Pucblo Dam. The average annual benefit <br />to urban and suburban property Hould he about $75,600. <br /> <br />94. Prevention of flood rclated losses to existing and future <br />devclopment in rural arcas would constitute $488,300 or about 66 percent <br />of total projcct benefits. The major part of this amount would be to <br />rai I roads and highHays and crops. r,lost of the benefit to crops is from <br />prcvcntion of intcrruption of irrigation Hater supplies caused by flood <br />destruction of diversion structures, headgatcs and othcr irrigation <br />facilitics. It is estimated that losses from this source average more <br />than $400,000 annually of "hich it is estimatcd that $84,000 ,;QuId be <br />prevcnted by the project. Total reduction of crop losses including <br />reduction of losscs duc to interruption of "ater supply Hould be about <br />$114,200 under prescnt conditiolls of production and price levels or <br />$211,200 including al1o'n'anccs for gro,"th during thc economic life of <br />the project. <br /> <br />34 <br />