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<br />. <br /> <br />C'.~}. <br />-:.J <br />N <br />'^'"" <br />t.l:) <br />CJ' <br /> <br />163 <br /> <br />5.5.1 Water Depletions <br /> <br />An accounting of monthly water consumption by both type and <br /> <br />location of use has been compiled for three levels of total Upper <br /> <br />Basin water depletions. Simulations performed using each of the <br /> <br />three levels of depletion allow system response to be examined for a <br /> <br />variety of demand conditions. <br /> <br />The depletion levels used have been selected from projections <br /> <br />of future consumptive use. The patterns of water-use therefore <br /> <br />represent conditions which may actually be expected to occur in the <br /> <br />Colorado River Basin (see Figure 5.4). <br /> <br />The writer has compiled eight sets of future depletions from <br /> <br />which the three presented here have been selected. These three levels, <br /> <br />denoted DPL #1, DPL #2, and DPL #3, have been chosen to provide an in- <br /> <br />formative range of depletion conditions. Levels DPL #1 and DPL #2 <br /> <br />correspond to existing commitments to planned or authorized water <br /> <br />projects. Depletion level DPL #3 includes further expansion of these <br /> <br />water projects and additional depletions for the anticipated deve10p- <br /> <br />ment of Upper Basin energy resources. <br /> <br />Depletions are divided into the following categories of use: <br /> <br />(1) exports of water from the basin; (2) municipal and industrial use; <br /> <br />and (3) irrigation consumptive use. <br /> <br />The monthly depletion values required by the model have been <br /> <br />obtained from the sources cited in the sections which follow. In <br /> <br />cases where only annual depletion estimates are available, monthly <br /> <br />values have been calculated in accordance with observed monthly patterns <br /> <br />for the particular type of water use. <br />