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<br />(:' l,) <br />\)(.)\9:.1 <br /> <br />Additional operative areas are difficult to using the data available for the study described in this report <br /> <br /> <br />t!ithout being speculative. For example, a good visual correlation can be described between ground-water levels <br /> <br />and ground-water withdrawals in the late 1970's and early 1980's. In fact, regression techniques can be used to <br /> <br />explain about 70 percent of the variability measured in the upland wells based on ground-water withdrawals. <br /> <br />Other, more advanced regression techniques such as stepwise regression, automates the procedure of selecting the <br /> <br />most effective algorithm for several independent variables, in this case the independent variables would consist of <br /> <br />,/\ <br />all hydrologic factors. When stepwise regression was implemented as part of this study, ![i~,:water )l(ithdrawaIs <br />// />~ '\'\ '~'" \'" "~ <br />were identified as insignificant. Thus, the existing data lacks the resolution neede~ tt~~rde d~~~l~~!,plana- <br />/ ~""<-"-,, '" ') // <;;",,'~ <br />tions of all phenomena present in the measured records. _ \ .:~>/ /', t. 'I v <br />//, \ { "'\ '-~, ,J <br />/ j'') L,-." \/ /~~'> '\",~_"'~ <br />One way to improve the current (1999) level of knowledge rnig~J..~_~i~l'Oa"c€li:a~\ll\u01Iection effort <br />// /-'~, \ -~/ ;(~ ~~~-~j .i <br />specifically designed to document losses from the Fort Lyon Canal ~n'1i)ilelJfe,;,t~IQYSurlac~:water application in <br />,\ "" / <' ~--"- \. ~ ~/ <br />" '; ,/ ?';'-,"---. ","', <br />'.', / ft, ", <br />the short term. Such efforts could most likely make use of eXlsIingiwells tlta~)li)'e ,~ro(~ sections of tile water table <br />//"'''"\ _._"\._-.'>- //"--"~,- <_/-~-_/ <br />.tween the canal and the Arkansas River. \'" /' <</,::~>'/ <br />" ~" <br />\ ~ ., <br />(~\\\_ \ ,,>'v <br />"" ,~ \ \. <br />,-: ---".,:>, "\\,\",- <br />/"'\", -t:'-"~,, ' <br />< ~\ \-. ""'/ <br />/'\,"'" -'.'" "\ <br />./ '\., ",< " <br />\" ~_ '''\ _" "\-v' <br />/',- "<:~ <'\ /' j'., <br />/ -",," ',< -'\~ ./' -) <br />Ground-water levels in the al!b~l~1~,9ifer<15~w,een the Fort Lyon Canal and the Arkansas River in the <br />/\, -'''--\~v) /<~~)- '~~> <br />vicinity of La Junta, CoIorado;:ftQ~ t)l~FortrLyon~\lnaI headgate east to the Otero County line can impair the use <br />( / <:::>> \>\~</~;~~~\,,:--::'/ <br />of agricultural land and pe,r~G~aypr6peltlj~Watl;i~tabIe and depth-to-water maps made on the basis of water-level <br />< <,/'~ ",'<:v' "\::'0\>- // <br />measurements fromM'iIrc;hpfJ99'.!l,j!1~i~~ iliat, during the measurement period, the local alluvial aquifer <br />"_ /., "\"/,,~:'~,,<<:;) ~rJ <br />received recharge froW t~e,!-,ortbJ,O:rrtanal and the Arkansas River and that as much as 50 percent of land surface <br /> <br />SUMMARY <br /> <br /> <br />" i) <br />'>,""," '\ <br />in the study area is w,lth,ifr'5-'fee(of the water table. In general, water levels are shallowest near the river and <br />. . I <br /> <br />become deeper closer tothe canal; areas of relatively shallow water levels are fairly widespread in the western part <br /> <br />of the study area. <br /> <br />A visual analysis of hydrographs for 5 wells with record from about 1965 to 1995 indicates a general <br /> <br />~ndenCy for water levels to have increased during this period. The general tendency for increase can be quantified <br /> <br />20 <br />