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000187 74 Colora,lo Highway 17 to Ilia Grande This channel, ahout an miles long, would generally follow do~cly the thnlwcg from Colorado Highway 17 to :--hortly bcyond Sun Luis Lake. .At this point, it would turn south to skirt the ~ump llnd Collow the most favoruble nlinelTIt'nt to the Rio GrundC'. It woutd dis(:hnrg:l' into the Hio Grundc opposite the mOllth of La J!ua Cr(,t'k. The location of the dHlIlnel wus sl.lected primarily to IH"Oyide 11 reusoIlllble bulnnce of cut llnd fill. The chunnel has brcn designed to receivp inflows from ground water pumping, triblltnry drains from ndjoining irrigntC'd areas, flood runoff, and Ilorllllll surface runoff of triblltllr~' strC'il.IllS. Snkllge plans do 1I0t contpmpilltp r('can'Ties from tlH' urea north llnd ('8:-;1 of San Luis Luke, :,ince this would jeopardize existing uSHges of water in this Ilrrll. Also, ther(~ i~ no sllh"age contem- plated downstream from sulnlge an'n 4. except in slllnl~c nr('llS 5 Ilnd 6. The exact location and quuntities of inflows due to ground wall'r pumping will not be definitely estub1i~hcd unt.il the finlll \\"I~II-ficld luy- outs hnvc hern accomplished. However, it is considered that the samplp well-fielrlltlyouts indicated 011 drawing 253-504-1824 furnish estimntl's oC probable pump discharges slltisfact"ory for preliminary design of tl1<' conveyance chullIH'ls. On the basis DC the estimllted ground water pumping nnt! otllt'r chnnllel inflows, tlw mllin ('onn~yuncl' e1u\Ilnel capncities dowIlstn~Hrn from Colorndo Highway 17 will increase Crom 34 cubic Cpcl pel' second III the highwuy to 15S cubic feet I)('r second ut thc$outhcfnIllost wells in wuter suh'age aren4, llnd remain cunstant nt 158 cubic feet per second to station 670+00, where the rllst side conVf'yancc dUl.Ilnel entcn) the mnin COll\yyunce chullneJ. From sla- tiOIl 670+00 to the Rio Grande, t1H' capll.cit:y will he 210 cubic fcet por st'cond..A drop inlet i:-; IU'o,"idcd Ilt station 670+00 to tlccommOllute inflow from the f'ust. ~idl' COlln'V:lIH.'C channel. The chunnel connecting witli Sun Luis Luke will permit diversioll of Hows frollt the main OH\'"cyanc{' channel for tcmponuy storage in San Luis Lake unt.! to mllintain the wulC'r 1(','cl in the lakl'. [t will in- \'olve u concrete check llCroS." the mnin ('on\"eYtU1CC chnnllel. The grudiC'nt of the ground surfllc{' nIld the C'lcnltion DC the Hio Grnnde bed nt the mouth controlled the channel sl )1'e, llnd the section was adjusted to pro\"ide the rt'<{uired cllPl1city. Drawing 253-504-1 823 presents profiles oC the chunnel groulHI surface llnd ~rnJe line. The mnterials ill which the chnnnel would be constrw.:tC'd consist of stratified clllYS llnt! sllnds. The plan contemplnles thllt the dUlIlllel would IHl\'e n ('oIllpnf'led-eurth lining whcre it tr:ty('rses the well field:-, above San Luis Lake to minimize recirnilotioll of the pumped g-rolllld waters, The ('hilnnel would Illl\-e 0 20-foO{. wide gra,.eled rond with turJlollb for porkill~ on the west hunk throll~hol1t its len~lh for public :H'ce:"s und mnintennn('{' of the chullnel. A ]2.fout :-.en'jce rOllll would be provlded on the eHst hank ulH)\.e San Llli~ Luke. \Yell and drllin inlets to the ('hnnnel would he carried llnd(>r the rolltb throug-h eOIll'fete pipe clIh"erL", Timber brid~ei' would proyide eroi':-,ing':-' of the c1l1lllnel Ht llpprnprillte IO('lItiolb. \Yllf're the ('hllnnel crOi':-iei' low spots. the em- bankment would be ('OInpol'ted to ilt lenst II hnlf-foolllbon' the desig:n wllter surCa('e with outside :-;lope:-, of 2;1 flnd 11 lIlillillllllIllTest width oC 6 feet. Ground-wllter datll indicate the inn"rt of the dltlnnel from Hell I' San Lui:-; toke to the olltlel would he below the minimum r{'('orded water table.