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<br />. <br /> <br />Of significant importance, however, in appraising present (or <br /> <br /> <br />future) conditions is the discharge data used to represent present <br /> <br />~'" <br />-.J <br />,::,. <br />G) <br /> <br />conditions, <br /> <br />for that is the starting point. <br />Handbook,(l) page 15, table 3, lists <br /> <br />The Methodology <br /> <br />Description/ <br /> <br />" <br />Flow (mean and <br /> <br />median monthly)" among the physical data requirements for the reach <br /> <br /> <br />model and lists the USGS, States, and Forest Service as sources of <br /> <br /> <br />data. The Description/Handbook, however, is speaking at this point <br /> <br /> <br />of historic flow conditions, not of conditions as they might have <br /> <br /> <br />been had the present level of depletions been in effect during the <br /> <br /> <br />full period of record. <br /> <br />. <br /> <br />In the course of the assessment, the Bureau of Reclamation, Denver <br />office, would prepare estimates of the natural, or virgin, flows in <br />major upper Colorado Basin streams for the period 1906 through 1974. <br />It would also prepare estimates of in-basin consumption, out-of- <br />basin exports, and evaporation losses to arrive at average annual <br />depletions under present conditions of development applied to the <br />19D6-1974 period. These estimates, however, would not be available <br />for several months. In order to run a check of the CIFSG model and <br /> <br />yet be reasonably withi n the range of "present-condi ti on" fl ows as <br /> <br /> <br />ultimately estimated by BR, that bureau's hydrologists suggested <br /> <br /> <br />that flow ,records be requested from the USGS for certain periods. <br /> <br /> <br />Accordi ngly, be 1 etter dated February 9, 1978, requested the USGS <br /> <br /> <br />Automatic Data Services at Reston, Virginia to furnish the following <br /> <br /> <br />for certain stations and periods of record: <br /> <br />. <br /> <br />34 <br />