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to the Nature Center Diversion Dam is senior to all other decreed water rights filed in Water <br />Division 1 during 1987 and 1988. <br />In United States v. Bell 724 P.2d 631, 636 (Colo. 1986), the United States was <br />denied the right to relate the filing date of an amendment back to the date of the original water <br />right application because the United States had not fulfilled the notice requirements of C.R.C.P. <br />15(c)1 The original application sought to appropriate water from the "Colorado and White Rivers <br />and water tributary thereto, which are located on [certain described lands]." Water from the <br />mainstem of the Colorado River was not located upon these lands, so the United States filed an <br />amendment to the original application seeking water from the mainstem of the Colorado River. <br />The Colorado Supreme Court denied relation back of the amended application to the filing of the <br />original application, citing with approval from 6 Wright & Miller, Federal Practice and Procedure <br />Civil § 1497 at 498 -9 (1971): <br />An approach that better reflects the liberal policy of Rule 15(c) is to determine <br />whether the adverse party, viewed as a reasonably prudent man, ought to have been <br />able to anticipate or should have expected that the character of the original pleaded <br />claim might be altered or that other aspects of the conduct, transaction, or <br />occurrence set forth in the original pleading might be called into question. <br />Id. at 638. The Colorado Supreme Court found that no reasonably prudent person should have <br />known from the United States' "unambiguous claims to waters" contained in its original application <br />that the United States was seeking water from the Colorado mainstem. Id. at 639. As such, the <br />19 C.R.C.P. 15(c) states: "Whenever the claim or defense asserted in the amended pleading arose out of the conduct, <br />transaction, or occurrence set forth or attempted to be set forth in the original pleading, the amendment relates back to <br />the date of the original pleading. An amendment changing the party against whom a claim is asserted relates back if the <br />foregoing provision is satisfied and, within the period provided by law for commencing the action against him, the party <br />to be brought in by amendment: (1) Has received such notice of the institution of the action that he will not be <br />prejudiced in maintaining his defense on the merits, and (2) knew or should have known that, but for a mistake concerning <br />the identity of the proper party, that action would have been brought against him." C.R.C.P. 15 applies to water court <br />proceedings 'only to the extent that the rule is not inconsistent or in conflict with procedures under the Act" United <br />States v. Bell supra, 724 P.2d at 635-6. <br />25 <br />