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<br />,002'$'55 <br /> <br />.. . > ~ ". <br /> <br />limitations. Section 46-206 provides that unused diversions must <br /> <br />be returned to the parent stream unless it is more than 100 feet <br /> <br />wide, in which event "not more than seventy-five percent of the <br /> <br />regular flow shall be taken". Section 46-265 states that owners <br /> <br />of any irrigation ditch or canal shall return the unused water to <br /> <br />the stream from which it was taken or to the Missouri River. <br /> <br />Ground Water <br /> <br />Until recently, the Nebraska Legislature had not adopted nor <br /> <br />affirmed any system of rights to ground water; therefore, this state <br /> <br />derived its ground water use rules from case law and two common <br /> <br />law theories. The first test was reasonableness of use. When <br /> <br />supply was readily available, a land owner could withdraw and <br /> <br />use water for any beneficial purpose, although such use was re- <br /> <br />strained to the over-lying land if diversion to out~lying land <br /> <br />would injure another user. The second doctrine, correlative <br /> <br />sharing in time of shortage, recognized that water moves from <br /> <br />under the land of one owner to others and required allover-lying <br /> <br />landowners to share proportionally in a dwindling supply. <br /> <br />Prior to the 1975 session of the Nebraska Legislature, Ne- <br /> <br />braska had only rudimentary beginnings of ground water use legis- <br /> <br />lation. An optional permit program for municipal wells had been <br /> <br />enacted and there is a well spacing statute calling for a minimum <br /> <br />distance of 1,000 feet between a municipal well and any well <br /> <br />serving industry, irrigation, or another municipality. Irrigation <br /> <br />wells on neighboring lands must, in general, be separated by a <br /> <br />distance of 600 feet. Only one act (Section 46-636) considered <br /> <br />the problems of interference between ground and surface water users <br /> <br />and it is extremely narrow in application, pertaining only to <br /> <br />2-37 <br /> <br />