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<br />feet and sometimes as much as 30 feet, commonly occur in areas near the Fort Lyon Canal, fluctuations
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<br />of about 10 feet also occur near the Arkausas River. This fact decreases the statistical significance of
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<br />simple conceptual models describiug fluctuation as a function of distance from the river. The magnitude
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<br />of fluctuations near the river are probably due to occasional high flows related to flooding or local
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<br />effects of ground-water withdrawals, or both.
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<br />Short-Term Variation in Water Levels
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<br />One question that may arise, especially since a temporal aspect to P~~~~R.~at5J;'~v~~~s/
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<br />been identified, is "How quickly do water levels change?". Many Of)~~';tv~!~5t~(~~t~~ei.Jecords,
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<br />based on spring and fall measurements, are not capable of descri9~g;:~bJ,t::tt(rm.~ljimgqiin water
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<br />levels. The historical records do include some wells that ~\ve b~etlmj.il;')l!~~)\fr~uentIy as weekly;
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<br />however, these wells are not located in areas wher~..rel~tive!Y:Jarge~fI~'C~at.ilDns in water levels have
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<br />been measured. /~ "..~\\\ ',,:," /' ""\ (''---..~/
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<br />Some of the remaining records ~!e!~~.~~5~~€ ~at)~!levels have had relatively large fluctua-
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<br />tions and have been measured, for,at~ea's,'soJl1e Jiilrt'oJtpe record, monthly or bimonthly. These records
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<br />indicate that water levels, in~~~~~~):;.~Il.~ge at least as much as 1 foot per month - a rate that
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<br />would produce the meatl,lj.t1Qtlla1i6n ip ~ m<:il\ths. However, water levels could change at rates greater
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<br />than the rates reP9~e:d{6rihf;\s~1~fh~,:lirs;~ricaI records do not adequately address the possibility that
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<br />the systerrHnaY~i'e.a'U\t()r€,c.fi\lr~~'a~ddischarge phenomena more quickly than the available data indi-
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<br />cate.
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<br />The hisioritai\'ec&ds also were evaluated for adequacy in their ability to represent changes in
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<br />cross-sectional gradients between the Fort Lyon Canal and the Arkansas River. Five roughly north-
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<br />south lines of three to seven weIIs were identified and the GWSI data base was accessed to obtain
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<br />historical water levels along the cross sections that were measured within a reasonably narrow window
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<br />of time (2 weeks). The results of this evaluation principaIIy indicated that the historical records are not
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