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<br />C) <br />C) <br />N <br />1-' <br />00 <br />o <br /> <br />148 <br /> <br />tN~ = the (synthetic) natural flow; <br /> <br />tDPLm <br /> <br />= the total depletion for municipal and industrial <br />use in the tributary t sub-basin, for month m; <br /> <br />tEXPm = the total volume exported from tributary t; and <br /> <br />tAGIm = the total irrigated agriculture consumptive use, <br />including evaporation from supply reservoirs. <br /> <br />Several assumptions are implied by this construction; (1) <br /> <br /> <br />that the Upper Basin demand is always met, if possible, regardless of <br /> <br />conditions elsewhere in the basin; (2) that Upper Basin demand is <br /> <br />independent of streamflow. These two assumptions effectively place <br /> <br />the worst case demands upon downstream reservoirs, i.e. can the <br /> <br />reservoirs supply downstream users without forcing reductions in up- <br /> <br />stream use. These are the strictest constaints that can be placed <br /> <br />upon the system when examining the required storage problem. (3) The <br /> <br />assumption is also made that the operation of upstream reservoirs <br /> <br />serves only to provide over year storage for the purpose of meeting <br /> <br />Upper Basin water demands. In practice this is only partially true. <br /> <br />During operation of the river basin model no change in upstream res- <br /> <br />ervoir storage is accounted for, although an annual drawdown-refill <br /> <br />cycle could be ftdded to the depletions of the appropriate tributary. <br /> <br />Average evaporation from these reservoirs is also subtracted as an <br /> <br />upstream depletion (an accounting of the depletions used appears in <br /> <br />Section 5.5). <br />