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<br />~ ~. <br /> <br />. <br /> <br />. <br /> <br />Itz.y ';1, 196, <br /> <br />~(!1 Q]? COlORADO GRa:IIID WATER A~lFER NA1'S <br /> <br />~e attached two _ps l:'a:re d<;atm to ill\!St.rate, in a general ~~, ';;he , <br />aquifers lIh1ch (1) are bydre1.!ll<:O:\lly connected to stream!l end (2) those vltich <br />have 11ttle ar no 1nfluence Q;!l streem fic.]. <br /> <br />Ma~ 1: The shellOli' alluvial deposits eloug the IIl81n stem end tribu- <br />taries the South Platte end Arkansas Riv8ZS J end in the San Luis Ve.l1ey. <br />.As noted. ~ e.1'ees too small end n=cmB to shmr on this _p e.J.so fall 1r:l:.o <br />this category. <br /> <br />The stream-connected aquifers m-e sub-divided into thaae areas receivW,3 <br />cal.tributians frail surt'Rce-uater 1r:l..lsation actiVities. and those 1lb1ch hav€' <br />DO artificial replenishment. Typ1cal~ gL'ound vater leveln in the are3lJ Ui10.eZO <br />irrigation ditches rise in the s~r and then dre.1n back to abcut the S&OO <br />level each spriDg. Wate!- l'S1l'els above :!.rr1getion di tchen, even thtiugh in th~ <br />same aquifer, fluctuate in e different lmIme:!'. T,yp1c~ 'i:he w,ter lc'V'el <br />lawo.rs during the SlDllll:er v.JllIpiDg season, '/;hen recovers pn"t, of the loss du:r:l.!l[i <br />the non-pllllip:l.ng seBBOID. bU'i; ending up eseh Spl":I.ng s<Jllelll:lat lower than the Y',,<. <br />ViOll8 spring. In general. these ara a':'elUl fac:l..ng eventual depletion of gl"Ol''ld <br />water suppl1es. Intermadiate areas shatl1ng a cOlllbinf',tion of these two :r:'fU:- <br />tors, depending ~ the 8deqU!l.Cy o:l t-he sw:tace su;pply. occur in areas \1D.W' <br />ditches turther ~ frail the IIB1n otem, such as Prospect \"elley and the BC!:i:- <br />elcler Valley north of Fort Collins. <br /> <br />Tbe sllall.clw aquifer of the Scn Luis Valley, DOrlh of 'i~he Rio Grsnd~ <br />River. is 8en~ cODSickr3d to not be Qyd:m1.!llcs.l.ly connected to the riv€>,:i'. <br />Spec1aJ. problell!S eld.st bere due to the :Ql'BCtice of keeping i;he v,l'..ter t:!l.ble <br />C10BB to the surfB.ce for sub-~l;1on. The ~t1011 of this aquifer in- <br />directly affects stream flCi>m due to the rapid recharge pt'ssibll1.ties after <br />the water hfls been pulled da'.m. in dry periods dWl to JIIIlIIPli25. <br /> <br />Map 2: A~ers shO<ll1 on KLp 2 relll'esent thDSe which have little or no <br />effect a1 stream. flaii. Thalle. in @)JIl!lr.l.1. are deeP. ccmft..ned &.C.'.l.'.i.fe:rs con- <br />sist1ns of conso11dated ar semi-cC!Dllo11deted =ter.l.fIls. 'l'be Ter'i;ie.ry aqu:l.f'm' <br />of the H18h Plains area of Faster'll Colo:re.do 16 confi.necl on~ locally. but in <br />general the '!later table is below tha bads of the stNams t'lld thErefore not <br />Cal.tr1blo:ting to the stree.m na-... In e;ene...""8l. i;be elq1I1fero shmm 00 this map <br />ere of lOll' transmissibility !IlId reclulrge. where plEnned cSuJeloprent 18 1m,po:t'- <br />tanto <br /> <br />It ahould be emphasized that, the atw.ch3d IlBpl ere fa.... illustrative <br />JRIll108es only. and are no'(; intended far :f:l.m'l use for eJl8C'~ determilIDtion 0." <br />b""mibl'llfes I .etc. <br /> <br />\ <br />\ <br /> <br />Engineers' Hnter J. ".v SubCOlIiiIIi t'GE:-e <br />on Ground ~!ater <br /> <br />M. li. BU't1nger, elm:' = <br />E. B. Wt':JgODex' <br />U. If. Wb.e8lel' <br /> <br />! <br /> <br />.' <br />