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<br />. ,"""J' <br />o>i .1,,1.' <br /> <br />(Benefit-cost ann1ysis, L~itio.1 Devolopnont) <br /> <br />that point eastward the poak .gro.duo.lly docrco.sod to o.bout 120,000 socond- <br />foot o.t Holly. Proporty d~ge in tho ,~ley was ostinctod at noro than <br />C19,OOO,000, of which ~10,OOO,000 wo.s in puoblo. Moro tho.n 150 lives woro <br />lost. ~voro.go annuo.l do.nngos .fron probable flo~ds botwoon tho potontial <br />Puob10 Roservoir and tho John Mnrtin Roservoir hn.ve beon ow.1ua.tod o.t <br />~1,349,000. Tho John ~hrtin Rosorvoir, conp10tod qy tho Corps of Engin- <br />oors in 19413, will so.tisfo.ctorily controll.rko.nso.s Rivor floods bo10w <br />tho nouth of tho Purga.toiro River. <br /> <br />although no definite. infor~tion oxists, probcb10 d~:mgos in tho <br />iiostorn Slopo <livorsion aroo. aro considerod nogligib1o nnd the locnl, <br />ninor flood dn=gos would bo pro.cticc.lly olir.1inntod by tho inci<lonta.1 <br />flood control provided in StruotlU"OS requirod for tho diversion of ...c.ter. <br /> <br />In tho ~rko.nso.s R~sin incidentnl flood control would bo c.ffordod by <br />Sugar Loo-1' c.rid Twin Lo.kos Rosorvoirs in tho hon~.w(ltors orono or tho <br />400,000 a.cro-foot co.pucity in puob1o Rosorvoir, 142,000 ucro-foot would <br />bo o.lloco.tod to flood control. With this onpo.city tho 1921 flood would <br />hnve 1:o0n control10d to 0. no.xmun discha.rgo of 10,000 socond-foot whioh <br />is 0. safo cc.puoity for tho prosont rivor cho.nnol through Puob1o. <br /> <br />. <br /> <br />By providin<; 142,000 nero-foot of f1aod contral spnoo in tho Puob10 <br />Rosorvoir c.nd controllin<; tho disohnrgo to u [~iDun of 10.000 socond. <br />foot, probo.b1o cvcro.go nnnual flood do.nc.gos of ~l,002,000 along tho <br />L.rko.nso.s Rivor betwoon Puoblo Rosorvoir (lnd John l.hrtin Rosorvoir out of <br />0. toto.1 of ~1,349,000 for tho s~"o uroo. including tho probo.b10 dnna.go <br />a.ttributod to trituto.rios would bo oli.':li.no.tcd. Tho o.vorc.go c.nnud gross <br />flood control bonofi'.;s ,"Iould thoroforo bo ;il,002,000, doto.ilod ooaputo.- <br />tion of which is shown in Appon<lix G, "Flood Control". <br /> <br />Sodinont control <br /> <br />Tho sodir.lont locd colloctod in tho stroo.n systoI:l is dotrmonto.1 to <br />irriga.tion dovolopnont; resorvoir capc.citios a.ro being ro.pidly dop10tod, <br />divorsion fo.c11i t;.os aro boing r.ndo inoffoctivo; o.nd ditch co.pa.ci tios <br />o.ro being inpd.o'od, Productive bettor.1la.nds a.ro do..=god or dostroyod qy <br />dop~d'", of inf Jrtilo soil a.nd sodi;:lont. Ba.n~ cutting end ca.ving is <br />clo~.G'r0~r..-r::.~ vC'J. '18. b:~c j,o.nd a.ncl o.d.<ling to taG SO~~ ir.lont laoe.. Turbid flows <br />a.dv",-,c'T ,,-if,,'..".- t:~0 qua.li-Cy of l:JUnicipo.l c.n(l inG.ustrio.l wo.tor supplios <br />and 'Co.c",!,' sl<pJ.'ly 3:., "\;0 1:1S ,. A.ggrrcdo.tion of s''2'oc.n bods oroo.tos flood <br />ho.zc.rc.s ::-.nd h_:'r~...w~v:.-::" to.blos. <br /> <br />. <br /> <br />9 <br /> <br />l <br />