<br />XXII
<br />
<br />LETTER OF TRANSMITTAL
<br />
<br />nuting in Colorado. It. slHwlJ he noted also t,hat., based uil the
<br />historic amollnt of sediment, passing the Clliflo Dum site, the agencies
<br />Illt\'e nllOealed less Ihna 4 percent of the capacity of the Chiflo Reser-
<br />voir to scdillll'lltlltion conlrol. Pructicully the only b(:nefit, t.herefore,
<br />that Clln be- claimed for the Chitia Dnl1l and Rt~scn'oir is the rcuuctil)1l
<br />of dnIllag('S due to iJllllldfiLioll lllld seollr. The- totul dHmnges est.imated
<br />from t,llOSt' sources is $4-1] ,2110. Fifty-six t.housand. sevell hundred
<br />and t.went.y dollars (If this estimated damage is for inundntion !Llld
<br />seoul' below Elephant Butte Rt~servoir. It is subsequently shown
<br />herein thnt t-Iie OPCI'flt,jOJl of the .'3HIl Luis Vll}JCY projpet o\'('r {,he
<br />;jS-Yt'ar period of l'c(,oJ'd(~d stream flow will eliminate nil but. three
<br />spills from Elephullt But.Le !Lud Cnbllllo RcserToil's. Slid! spills ('llll
<br />lJl' regulaLed to channel capacity hdow Cn1.ml1o Rescn"oir by t.be
<br />prolWl' operat.ion of t.he ElepllllJ1t BuLte lln.! Cnbitllo Resl:'n.oir~. It is
<br />coneludcd nn eredit. el1ll be taken for uny benefit frulll the proposed
<br />J)J'\)jcet to the fi.I'NL helow El(~philnt, Butte ReSeI'yoir. The totul
<br />damages rstimntcd frolll inundation nnd seoul' nbove Elcphnnl. Butt.e
<br />Rcs(~n'oir is $:384-,540 per rulTllilll. which appears to be nIl of the ('n~dit
<br />whidl CUll be tnkcn for t.he projeet for the prevention of inundation
<br />und scour on the basis of the e:Himutr-s Illnde by t.he Corps of EnginC'crs,
<br />Tlw estimut.ed nnnuo.l cost. of Chino Dlllll nnJ Rcscl'yoir is $1,2112,-
<br />300. Oyer 40 percent of the spring floods originate: in t.hl' CJHlllln
<br />Rin'lT Bllsin. V\Tit,h those floodg controlh~(l hv a l'I'seJ'voil' on l.he
<br />Chnmn, and wit.h the prott~ction nffonled hv ext(:jldilw :llld rt'_hnhilitl1t.-
<br />ing- t.ite le\.N~ syst.mI;. Llw residual damnges' from inUl~lntion and ~COllr
<br />would he slIbstnlltilllly less t,haIl the $3-18,5--10. It is very nppul'l'nl
<br />t.hat. the Chino Dnm und Heservoir cannot be t'onomienlly just.ifled to
<br />}Jl'l~YenL slH:h rl~sidunl dllmnges.
<br />T:1ule No.1 II! tUl'-lied "\~I:(lto indi~at,(~s t.lwt with fiO,l,OOO llCl'e-fl'{'lt
<br />of ftood-control storng(~ on the Chnmn unu ahouL 100,000 nere-fcl~t
<br />of st,orage Ileal' t.he Colorado-New jVJexico Stnt(\ line, all flows at
<br />Otowi from lSgO to 1947 could be cOHLroll(~d loa G,OOO cuhit: fcet. per
<br />second to t.he. extent that the now could be limit,ed to that nmollnt by
<br />rescrvoirs locut,cd n.t, the nbove sites. Tnhle No.2 indicntes tlHlt t~J
<br />control t.he flow to 5,000 cuhie frd Jwr second nt, Snll"i\:lnl'cilll, illsofnr ns
<br />it, could be controlll~d to thnt rate by reservoirs IOClltcd fit t.he Chnmit.fi
<br />site nno neilI' t,he Colomdo-New ':i\'Il'xiL'o St.Hte. line, would I'equire
<br />about. 030,OOn u.crC-fl'l.t fit the ChiUllit.n site and about 230,OOn nl're-
<br />fC'et nenr the Colol'udo-Nc\v l\Jcxieo St.ute line. If no rontrol is pl'O-
<br />vidctl 11('11.1' the Colorado-New ~Iexico Stut,r line, t.here would Iw 19
<br />yellrs dUl'ing snch fL IWI'iod as 1800 through 1047 when the flow of t11(-'
<br />river fit Otowi would exceed 5,000 cuhic feet pCI' second be(~aUSl~ of th~
<br />lack of such control. During four of the Yl'IlI'S the flow would cXL'eed
<br />7,.500 cubic feet per sc-('ond, and durin!,! two of t.hl.' VI~lll'S the flow
<br />would eXl'ced 10,UOO cuLic fpet per se('on~t with 0 lIlllxilllum of 20,000
<br />cubic feet per second. All of the rt'sidunl mL('s of flow 111'C well helow
<br />the capacity of t.he ftoodwnys provided by t,he levee system. Tlll~
<br />result.s of t.he higher rntC's of flow~ which wouId ocelli. during the limited
<br />nlllllLI!~r of yenrs due to t.hc luck of cont.rol at. t.lw Stnt,e line. would
<br />result, in incrcnspd m:1intennnec of the leyce svstcm. This increased
<br />maintenance would become less as the chanue(degradt'd find incn~nsed
<br />in L'ltpacitv to accommodate mueh of the increllse in How. It is \'(~rY
<br />doubtful \~'hethcr tile uverage annunl cost of sueh increased maint.e-
<br />n:1Ill'e would equal the annual cost of n. reservoir near the Colorado-
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