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to it by article III of this compact shall be in such quantities and at such times as shall be determined by the commission upon the application of the following principles: (a) The extent and times of curtailment shall be such as to assure full compliance with article III of the Colorado river compact; (b) If any state or states of the upper division, in the ten years immediately preceding the water year in which curtailment is necessary, shall have consumptively used more water than it was or they were, as the case may be, entitled to use under the apportionment made by article III of this compact, such state or states shall be required to supply at Lee ferry a quantity of water equal to its, or the aggregate of their, overdraft or the proportionate part of such overdraft, as may be necessary to assure compliance with article III of the Colorado river compact, before demand is made on any other state of the upper division: (c) Except as provided in subparagraph (b) of this article, the extent of curtailment by each state of the upper division of the consumptive use of water apportioned to it by article III of this compact shall be such as to result in the delivery at Lee ferry of a quantity of water which bears the same relation to the total required curtailment of use by the states of the upper division as the consumptive use of the upper Colorado river system water which was made by each such state during the water year immediately preceding the year in which the curtailment becomes necessary bears to the total consumptive use of such water in the states of the upper division during the same water year; provided, that in determining such relation the uses of water under rights perfected prior to November 24, 1922, shall be excluded. Article V (a) All losses of water occurring from or as the result of the storage of water in reservoirs constructed prior to the signing of this compact shall be charged to the state in which such reservoir or reservoirs are located. Water stored in reservoirs covered by this paragraph (a) shall be for the exclusive use of and shall be charged to the state in which the reservoir or reservoirs are located. (b) All losses of water occurring from or as a result of the storage of water in reservoirs constructed after the signing of this compact shall be charged as follows: (1) If the commission finds that the reservoir is used, in whole or in part, to assist the states of the upper division in meeting their obligations to deliver water at Lee ferry imposed by article III of the Colorado river compact, the commission shall make findings, which in no event shall be contrary to the laws of the United States of America under which any reservoir is constructed, as to the reservoir capacity allocated for that purpose. The whole or that proportion, as the case may be, of reservoir losses as found by the commission to be reasonably and properly chargeable to the reservoir or reservoir capacity utilized to assure deliveries at Lee ferry shall be charged to the states of the upper division in the proportion which the consumptive use of water in each state of the upper division during the water year in which the charge is made bears to the total consumptive use of water in all states of the upper division during the same water year. Water stored in reservoirs or in reservoir capacity covered by this subparagraph (b) (1) shall be for the common benefit of all of the states of the upper division. (2) If the commission finds that the reservoir is used, in whole or in part, to supply water for use in a state of the upper division, the commission shall make findings, which in no event shall be contrary to the laws of the United States of America under which any reservoir is constructed, as to the reservoir or reservoir capacity utilized to supply water for use and the state in which such water will be used. The whole or that proportion, as the case may be, of reservoir losses as found by the commission to be reasonably and properly chargeable to the state in which such water will be used shall be borne by that state. As determined by the commission, water stored in reservoirs covered by this subparagraph (b) (2) shall be earmarked for and charged to the state in which the water will be used. (c) In the event the commission finds that a reservoir site is available both to assure deliveries at Lee ferry and to store water for consumptive use in a state of the upper division, the storage of water for consumptive use shall be given preference. Any reservoir or reservoir capacity hereafter used to assure deliveries at Lee ferry shall by order of the commission be used to store water for consumptive use in a state,