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<br />001952
<br />
<br />surface-water applications, like ground-water withdrawals, were less than the applications made in the late 1970's
<br />.
<br />and early 1980's.
<br />
<br />Ground-Water Withdrawals
<br />
<br />When necessary, ground water is routinely withdrawn from the local aquifer for irrigation purposes to
<br />
<br />supplement irrigation made with surface-water diversions. Ground water also is withdn;J,wprfor public water
<br />,0-,,- "~, ,/',",
<br />
<br />supply. These withdrawals represent discharge from the aquifer. Irrigation wells a~~~b~~ (~~~~~tthe
<br />
<br />f~~,~ ~ ""'''''~ /~,'~-~~ ~'\ ~"
<br />study area in a uniform fashion. Water-supply wells, operated by the city ofLa~u~\lt~cI~rerea).p'ai1 area of La
<br />", \ \/ f''',,/ /, \, '\"", f l
<br />
<br />Junia on the north side of the Arkansas River. The water withdrawn for ~~~~mi:i~ VS)l~ll~~~a::t~ flood fields,
<br />/" ~:,:~_'~,,,~\, (,""V'>",,;~:::~ff) ") ~/
<br />although some alternative methods, such as spray and drip irrigatiop,<1tre'Usctr: 1:'htN:e\:{r'ds/availabIe for analysis
<br />"~,"~",,/' if ,^,"", '\ \ ''^'' >
<br />
<br />in this study are from a previous study (Goff and others, 19?8f~nd ar~)&~~~)n ;abIe 4. They are annual
<br />{;:..~~<;' \" < <./"'-,2' _
<br />
<br />records and are based on reported withdrawals from the"c;~~f'taJunf3:l\lifl:y;;{imgation wells, a method
<br />" '\/ /' ,>~~) (<,/ -"-~~~~>/
<br />
<br />.ferred to as the power conversion method that es~~~:~e/~O.u~bl\v~er withdrawn at individual wells
<br /><:_, \ \, /)'._J / (""'\ '\
<br />based on power meter readings. The record~.aIong~ilh .r.f!~6Ilisf0r)other hydrologic factors, also are shown in
<br />/"-~"~ -\i;'^~,,"--,_~;;- .r" -( '\,,,-,, fiJ
<br />
<br />figure 7, which represents each factor a<~~~~)i;,~its :a~~)~) '.'
<br />" '--':~::,<\:\:~-;/><( ,
<br />The Colorado Division o~ W-l!1~~~~:~;:~~ains contemporary records for withdrawals made by irriga-
<br />
<br />tion wells that offer more';Jetll~!;~~);;,~~:'I~~~~}m the historical records. These contemporary records,
<br />'\ ',/ ,'/ _ /",,'- /' .,F, /"> _-4~___'
<br />however, are just beingCP'1I!?il~ir~n~~~i~~e\here are only 1 or 2 years of record, that represents a different set
<br />F " > -,' \'\ "~,\,/
<br />of wells, were not usecj:inlhis~~aiYsis:::;)
<br />", ',,' ~ /'::\~\,,':/())
<br />The records from,ClQlfall~'others (1998) indicated that, in general, ground-water withdrawals have
<br />
<br />" '
<br />
<br />decreased in the study.atell(fig. 7). From 1973 through 1976, withdrawals increased steadily to a high for the
<br />
<br />period of record. After 1976, decreases began at a modest rate that became more pronounced during 1978.
<br />
<br />Decreases continued, punctuated by an increase during 1981, through 1987, after which ground-water withdrawals
<br />
<br />increased and then assumed a relatively steady level. These records indicated that the ground-water withdrawals at
<br />
<br />.
<br />
<br />14
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