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<br />, <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />must necessarily be based on assumptions as to the amounts and loca- <br /> <br /> <br />tions of these accretions to river flow between gages. In analyzing <br /> <br /> <br />stream flows and accretions on the South Platte River between Denver <br /> <br /> <br />and the Narrows site, it must be recognized that it takes from 3 to <br /> <br />3~ days for water to travel between those points. In some instances <br /> <br />the study computations indicated that water would be passing Denver <br /> <br />which would reach the Narrows site, and thus be theoretically avail- <br /> <br />able for diversion by an upstream ditch through exchange from the <br /> <br /> <br />Narrows Reservoir for a period of two or three days only. In such <br /> <br /> <br />cases it would not be possible for a river administrator to foresee <br /> <br /> <br />and put an exchange procedure into practical operation. This is <br /> <br />especially true when runoff from local rains causes sudden increases <br /> <br />in accretions in river reaches between Denver and Narrows, which <br /> <br />permit diversion demands in those reaches to be satisfied from <br /> <br /> <br />accretions alone for short periods. The results of any study should, <br /> <br /> <br />therefore, be considered as indicative and not an accurate quantita- <br /> <br /> <br />tive determination of eachangeable water. <br />The studies made by the staff of the Colorado Water Con- <br /> <br />servation Board were based on historic stream flows and present <br /> <br />administrative procedures for the period 1952-1957 inclusive. Since <br /> <br />junior ditches which might benefit from exchanges have indicated <br /> <br />that their greatest need is for late season water, exchange potentials <br /> <br />were determined only for the months of July, August and September of <br />those years. <br /> <br />- 2 - <br />