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003133 Page 32 Because of the peculiar shape of the hydrologic record for the Colorado River, the ideal approach would be to derive statistics from the historic flow records and, to the extent possible, the tree ring data, and use these statistics to develop synthetic traces to be used as the basis for the analysis. However, the scope of the study would not allow for such an undertaking. In addition, the USBR flow and consumption data used here have become to some degree a de facto standard. For this reason, use of these data will allow direct comparison of the results of this study with those of others. r~ It was necessary to consolidate data to conform to the nodes and seasons used in the model. Further, it was necessary to modify the data to reflect the enhancement from vegetative manipulation. This was done as follows: The ,28 data stations were mapped into 13 nodes for modeling purposes (see Table 111-3). Flow enhancement occurred at the Glenwood Springs station which was mapped into node 18. ~ ~ 2. Water uses and losses Because the model studies were based on virgin flows, it was necessary to quantify the present level (1980) of consumption as well as additional consumption which could occur in the future. Because in the unconstrained case it would be possible for a potential use to displace current consumption, it was necessary that the current uses as well as prospective uses be classifed according to category and net value. Consumption was the measure of use. Although the use of consumption could mask some local shortages, it was impractical to explicitly represent the diversion and return flow of each of the thousands of diversions in the Upper Basin.