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<br />2 <br /> <br />INTRODUCTION <br /> <br />As a part of the present study we were to recommend <br />whether Gross Dam should be enlarged at the present time, and <br />the amount of regulatory and holdover storage that should be <br />provided. We were to review the programming of the construc- <br />tion of the various new works under consideration by the Board, <br />and recommend any changes which seemed desirable. <br /> <br />As a part of the study we were to calculate the amount and <br />value of power that could be generated by water brought from <br />the Western Slope both through the Moffat Tunnel and through <br />the Harold D, Roberts Tunnel, as well as that which will be <br />generated by Williams Fork power plant, We were also to esti- <br />mate from an engineering standpoint the amount of South Platte <br />water that could be practically and economically exchanged for <br />the return flow which will result from future increased importa- <br />tions of water from the Western Slope by the City, <br /> <br />It should be realized that no water study for a growing <br />metropolis is ever completed, Conditions are in a continual state <br />of flux. Population trends change, and can be materially affected <br />by unforeseen events, Water supplies available under a given <br />group of water rights continuolly change as the sources from <br />which the supplies are derived fluctuate from period to period <br />because of the vagaries of nature, It must be recognized therefore <br />that, even though the terms of reference under which the present <br />study was made are definitely fixed, the conclusions reached as <br />the result of the study cannot be considered as fixed for all time. <br />Unforeseen departures from basic assumptions are inevitable, It <br />is important that this be fully realized and that procedures be <br />established for a continuing review and re-appraisal of basic con- <br />clusions in the light of changed conditions, <br /> <br />Further, it must be recognized that the present study deals <br />only with the water supplies available to the City from its present <br />water rights and with its present foci I ities, together with those <br />supplies which can be made available by the facilities now under <br />construction and those proposed for construction under existing <br />decreed water rights, It can be expected that the growth of the <br />City and its metropolitan area will at least keep pace with the <br />population growth of the country, The rate of growth may even <br />