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42 the many expressions of concern for those rights in the record argue against congressional intent to limit Navajo rights through quantification. Another point undermines the notion that the NTIP legislation quantified Navajo Winters rights for all time. That is the ambiguity over just how much water the tribe was granted by the legislation. The statute speaks clearly of a 508,000 acre-foot annual diversion. lOB The later hearing record mentions annual consumptive use of 252,000 acre-feet.'09 Another figure emerged when the Bureau of Reclamation, in the , , course of building the project, decided for economic reasons to shift from the . :, " ~ ~ ~ r~ I " originally planned gravity-flow irrigation to sprinkler irrigation. This decision reduced ,. (~ the diversion required to achieve the same amount of consumptive use to 330,000 acre-feet a year.110 Thus there has been confusion over whether the Navajo have :~ , rights to the 508,000 acre-foot diversion mentioned in the legislation, the 252,000 acre. feet of consumptive use required to complete the project, or the new 330,000 acre- foot diversion required under sprinkler irrigation to achieve consumptive use of "' l' i~. l> i fr~_ ~ ~[ . ~ :<;J ~~.; .':::, , ~. ; ."iJ. '1' i.; lOBNIIP Act.. ~ note 1, Sec. 2. For discussion of the meaning of the legislation's choice of diversion rather than depletion, ~ DuMars and Ingram, ~ note 3 at 27- 28 and 34-35. 109~ Senate Hearin~ 1959, ~ note 17 at 19 and Senate Hearini 1961. ~ note 17 at 49. ~ discussion of early mention, in BIA testimony, of larger consumptive- use figure in note 17 ~. 110~ Bureau of Reclamation, Department of Interior, Navajo Illdian Irri&ation Proiect. New Mexico. All-Sprinkler Irnl/ation System 2 (1974).