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Show COLORADO 709 and, after publication, notice, and hearing, shall establish priority dates of the respective wells and final permits therefor.220 The Commission "in the effectuation of the policy of this state to conserve its designated ground water resources and for the protection of vested rights" has been authorized generally by the 1965 act to "supervise and control the exercise and administration of all rights heretofore or hereafter acquired to the use of designated ground water." More specific powers of the Commission include the following provisions: (1) "[I]t may, by summary order, prohibit or limit withdrawal of water from any well during any period that it determines that such withdrawals of water from said well would cause unreasonable injury to prior appropriators; provided, that nothing in this article shall be construed as entitling any prior designated ground water appropriator to the maintenance of the historic water level or any other level below which water still can be economically extracted when the total economic pattern of the particular designated ground water basin is considered." (2) It may "establish a reasonable ground water pumping level or levels in an area or areas having a common designated ground water supply. Water in wells shall not be deemed available to fill the water right therefor if withdrawal therefrom of the amount called for by such right would, contrary to the declared policy of this article, unreasonably affect any prior water right, or result in withdrawing the ground water supply at a rate materially in excess of the reasonably anticipated average rate of future recharge." (3) It may "issue permits for the construction of replacement or substitute wells. Any permits issued shall set forth the conditions under which a well may be modified by a change of the well itself, the pumping equipment therefor, by the drilling of a substitute well, or otherwise, in order to make it possible for the owner of a well to obtain the water to which such owner may be entitled by virture of his original appropriation."221 220Id. As amended by Laws 1971, ch. 367, § 7, p. 1314, separate lists may be published for subdivisions of the designated basin when it is shown that a subdivision or area does not affect the supply of water available to another subdivision or area. With respect to the determination of priorities, the act provides, inter alia: (1) All claims based on beneficial use prior to its effective date shall relate back to the initial date of such use, while claims based on subsequent beneficial use shall date from the filing of an application therefor; (2) "All wells constructed as replacements for or as supplements to an original well or wells for the same beneficial use, shall be considered as a unit and awarded a priority date of the earliest well"; (3) If two or more appropriations "either heretofore or hereafter made, have a common date, the priority number shall be accorded by lot." Colo. Rev. Stat. Ann. § 148-18-8 (Supp. 1965). 221 Colo. Rev. Stat. Ann. § 148-18-10 (Supp. 1965), as amended by Laws 1967, ch. 188, § 4, p. 276. As amended by Laws 1971, ch. 367, § 8, p. 1314, it is further provided inter alia: (1) "No supplemental wells or alternate point of diversion wells shall be allowed in any area of any designated ground water basin in which the proposed well or |