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Article IV -Curtailment <br />If the Upper Division States have to curtail use of Colorado River water to assure that flow of the river at Lee Ferry is not depleted below 75 maf /10 yrs, the UCRC will determine the quantity each state owes and the timing of curtailments on following three principles: <br />(a) Curtailment must assure full compliance with Article III of the 1922 Compact (Hammer Clause); <br />(b) Overusing states must payback the amount of their overuse in the last ten years first; <br />(c) If overuse payback is insufficient to meet the flow target, then the states must deliver at Lee Ferry an amount of water that is proportionate to their use in the year immediately preceding the curtailment year. <br />Present perfected rights are excluded from curtailment.