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003137 Page 36 Basin. The demand level at Node 34, 729,000 acre feet, was determined by taking the difference between the highest historic delivery by MWD and its high- priority entitlement (498,000 acre-feet, Node 33). Similarly, the ultimate demand of CAP was set at the physical capacity of the diversion. Strictly speaking, this overstates Arizona's entitlement in the constrained case (Arizona's total entitlement, as set by Arizona v. California is 2.8 MAF). When simulating operation of the system under institutional constraints, the Lee Ferry delivery obligation served to separate the system into the Upper Basin and the Lower Basin. Under Article lII(c) of the 1922 Compact, the Upper ~ Basin must allow 75,000,000 acre-feet to flow past the Lee Ferry gage in any ten-year period. One common inte~pretation of Article lII(c) of the 1922 Compact, however, holds that the Upper Basin must also contribute half of the 1.5 MAF/year delivery obligation to Mexico for a total obligation of. 82.5 MAF in I , any ten-year period. The current operating rules of the Department of the Interior for Glen Canyon Dam both reflect and disclaim this interpretation. These rules provide for a minimum release from Glen Canyon Dam of 8.23 MAF per year. The Paria River confluence with the Mainstem is below Glen Canyon Dam (and the Lee's Ferry gage) but above the Compact Point at Lee Ferry. The Paria contributes an average of 20,000 acre-feet to bring the total annual delivery to 8.25 MAF on the average. The rules do not provide any mechanism whereby releases from Glen Canyon Dam may be reduced below 8.23 MAF. Thus, the rules do not implement the strict interpretation of the 1922 Compact which would cause the release at Glen Canyon to be reduced below 8.23 MAF to reflect higher. releases during the previous ten years.