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<br />- <br /> <br />- <br /> <br />The lnterdepend~nce b~tween inbasin and out of basin useg suggests so~e <br /> <br />mutuality of intere,t, among water users throughout the West. Most of the <br /> <br />West could be considered as a single water "market," subjeCt only to the <br />"""~, ~ !"'--r---~-r ~::v_.:Jd..:"'" . <br />economic reach of water transfer facilities~ Political barriers may also <br />^ <br /> <br />exist. The issue of state prohibitions against interstate transfers is raised <br /> <br />later in this paper. <br /> <br />- <br /> <br />(5hZ) <br /> <br />Can Management Of Colorado River Water Be Considered Apart From Groundwater <br />Use? <br /> <br />There is little question that pumping of groundwater hydrologically con- <br /> <br />nected with the river is included in its management regime. While it went <br /> <br />unmentioned in the 1922 compact, the Supreme Court interpreted related ground- <br /> <br />water to be within the scope of management authority in the Boulder Canyon <br />27 <br />Project Act. A now common understanding of the fundamentals of hydrology <br /> <br />demands that groondwater be regulated along with the river flow it affects.28 <br /> <br />Indeed most basin states a:anage ;'tributary" groundwater as a part of the <br />29 <br />surface system to which it is connected. <br /> <br />~se of groundwater by basi~ states is important for tiver management even <br /> <br />if the groundwater source is not connected with the river. Just as there is <br /> <br />an interrelationship between basin and non-basin sources, groundwater use is <br /> <br />relaced Co use of river water. Use of one can supplant the need for the <br /> <br />other. The 1968 Colorado River Basin Project Act requires conservation in <br /> <br />30 <br />groundwater development. If sources are to be complementary. it is essen- <br /> <br />tial that they be developed and used with great care. Heavy uses of ground- <br /> <br />water in Arizona place increased demands on the river as the aquifer is <br /> <br />threatened with depletion. Thus, extractions and overdrafts of groundwater in <br /> <br />the Lower Basin may actuaily be "paid for- by Upper Basin states. Congress <br /> <br />was aware of this prospect. Before funds were appropriated for the long- <br /> <br />- 12 - <br />