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<br />Lake tl,r,'~SIl hacks up bdlind r.lrkll !J<1m for ,1bOllt 45 milt ,1I1d ~PtW,s as it
<br />fOlpbay from '.ddch thp ~{,lrop(llit,1I1 '.I,l~(,1 "i t!in of So1tllwln Citlifnrni<l
<br />~ pumps \latel into th{' Color:ulu Rivf'l A!]llprhHt. 1.1kp ILi\',lSII .11"'0 :<;pl'ves.:l<:
<br />~ f(l1dl<lY fOI the CPlllral AI ii'OI',l rlujet:t ~'Ilmpiljp, pldllts illlll af~lIt:'dllttS. LaYE>
<br />'-1 Hav8su and Alamo Darn <lllrl RCSl:I;OiJ, Oil the Bill '~'illiilm$ Ri'll,.'I, ,:uP llsed to
<br />(', contlo} floods origill.1t ing belo~ Drt'.'i Dam and aho':(> P,lrkel tJ.lm.
<br />
<br />Headgate Rock D<llTl. Palo 'J~'rde Din-rsion Dam. and Impet ioll [)ilm all serve
<br />as di'/ersion srrllcttlfeS ...iTh prarlic:llly nn "fOr<'lp:f>. ImpPli<'l1 IJ.1m. located
<br />some 15U miles do',mstH>"m fro~j Palkel Oitffi. i!: tllt.- n1iljor diversioll stltlC':ture to
<br />irrigation projects in the Imperial Valley and Yuma areas, It divens ..:ater
<br />on the right bank to the All AmeliCitJ1 Callal. ....hich delivels Viilet to the Yuma
<br />Project in AriWfl<l and r:l 1 ilnr-ni,l ,1ml fmperial <'lnti Coachf'lIa V<llleys in
<br />Califontia, It divE'ns on thE' If:'f! b.lnk to th€' (;iLl Gravity Main Canal.
<br />
<br />The S€-'llathl- V.1~;h Dilm, ;m oit~;;tI<-'alll storage facility, also affords
<br />regulation in the vidnity of Imperj,-d /Jam and ;H;sists in the dc1iw>ry of
<br />valer to M~xico. This ladUty is used tOt pUlllpoack storage ;Hld I'ecreatiofl.
<br />
<br />The /'Ior(-}05 Dam is lO'ilTf'd JUST
<br />"ilh Mexico ann is tilt;' L:Jst dJm 011
<br />dil/tl divel ts ValeI' into the Alamo
<br />Mexico.
<br />
<br />h",IO\.' thE' Nnnhern InIPrnatifln,,1 Boundary
<br />the COIOt.Hlo River, This small diverSiun
<br />Canal ~'hich deli-Jels '.,ratel to northelll
<br />
<br />D. Geol(~~ ~n~Soj.!s
<br />
<br />The geology of rbf' C010lM1Q Rivf'l- R,t<:in i... highly val if'ti. Ignf'olls,
<br />metamorphic, and serli wlltaq' lo.:k typf'S illl' fll'CS~lIt ,1110 r<lrrp,e in age lrom
<br />apprOldmately 6::'5 mill ion yeills old to ("('rent alllJvi.,1 deposits. Struclurill
<br />fealures, includinr. anli"lillp~. domps. anti t,'lults contlihute 10 !loth the
<br />topop,r<lptdc relief ilnc! the p:H,hydtolo~{y of thp lep,inll.
<br />
<br />Sever'll of lh€' '_;~dimf'nLilY t(1rmations in thp. Hasin vpre dern~ited in
<br />marine 01 hla('ki!'h 'Jafp! €'nvirOtlrllE'nrs. llcC'lln-en('f'.~ of bedded itnd di~s{>minate<1
<br />sodIum chloride (halite) and calcium sul1.1l.e (g"'p~lIm) al(: ob.".~'rved.1.5 are
<br />clays '.Ii [h high content" ot t}:chanr.eable sodium and ~"g'nesillm.
<br />
<br />The soils of thf:> Cnlolildo Rivt-'r B<1sin rlo<;;€'ly r(>sembl~ lhe gf'nlORic
<br />formal ions flom vhich Ihp)' ....pre del ived. R05idllill ,<;oil~: dt'l ived flom shille Ot
<br />sandstone ale generally '.h.lllo.... These soils (,,111 conr,lin appreciable soluble
<br />minerill content dup to le!,jrk,ll and secondary mineral form,ltion from the
<br />parent material. Upflll '.,reatllt-'tinR or itl igation, salls may d('('umul,1.te on or
<br />near the SUI face due to evapol.l:ion or consumptive 1l5e by plallts.
<br />
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