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(j) The term "Commission" means the administrative agency created by article VIII of this compact. (k) The term "water year" means that period of twelve months ending September 30 of each year. (1) The term "acre-foot" means the quantity of water required to cover an acre to the depth of one foot and is equivalent to 43,560 cubic feet. (m) The term "domestic use" shall include the use of water for household, stock, municipal, mining, milling, industrial and other like purposes, but shall exclude the generation of electrical power. (n) The term "virgin flow" means the flow of any stream undepleted by the activities of man. Article III (a) Subject to the provisions and limitations contained in the Colorado river compact and in this compact, there is hereby apportioned from the upper Colorado river system in perpetuity to the states of Arizona, Colorado, New Mexico, Utah and Wyoming, respectively, the consumptive use of water as follows: (1) To the state of Arizona the consumptive use of 50,000 acre-feet of water per annum. (2) To the states of Colorado, New Mexico, Utah and Wyoming, respectively, the consumptive use per annum of the quantities resulting from the application of the following percentages to the total quantity of consumptive use per annum appropriated in perpetuity to and available for use each year by upper basin under the Colorado river compact and remaining after the deduction of the use, not to exceed 50,000 acre-feet per annum, made in the state of Arizona. State of Colorado51.75 per cent, State of New Mexico 11.25 per cent, State of Utah23.00 per cent, State of Wyomingl4.00 per cent. (b) The apportionment made to the respective states by paragraph (a) of this article is based upon, and shall be applied in conformity with, the following principles and each of them: (1) The apportionment is of any and all man-made depletions; (2) Beneficial use is the basis, the measure and the limit of the right to use; (3) No state shall exceed the apportioned use in any water year when the effect of such excess use, as determined by the commission, is to deprive another signatory state of its apportioned use during the water year; provided, that this subparagraph (b) (3) shall not be construed as: (i) Altering the apportionment of use, or obligations to make deliveries as provided in article XI, XII, XIII or XIV of this compact; (ii) Purporting to apportion among the signatory states of such uses of water as the upper basin may be entitled to under paragraphs (f) and (g) of article III of the Colorado river compact; or (iii) Countenancing average uses by any signatory state in excess of its apportionment. (4) The apportionment to each state includes all water necessary for the supply of any rights which now exist.