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<br />. <br /> <br />w <br />00 <br />W <br />::..11 <br /> <br />Table Ill-I. Drainage area and historic unit discharge <br />Upper Colorado Region <br />(after Appendix V, Comprehensive Framework Study) <br /> <br />. <br /> <br />Gaging Station <br /> <br />Drainage Record Unit <br />prior to <br />area 1965 discharge <br />Squ;lre Miles Years Cfs/Sq. Mi. <br />l03 46 0.922 <br />4,560 66 .596 <br />8,050 32 .484 <br />24,lOO 54 .327 <br /> <br />. <br /> <br />Colorado River near Grand <br />Lake, Colorado <br /> <br />Colorado River at Glenwood <br />Springs, Colorado <br /> <br />Colorado River near Cameo, <br />Colorado <br /> <br />Colorado River near Cisco, <br />Utah <br /> <br />. <br /> <br />. <br /> <br />Colorado River at Compact <br />point, Lee Ferry, Arizona. l09,580a . 52 .155 <br />aDrainage area as measured in connection with this study; other area <br />figures are from USGS Water Supply Papers <br /> <br />. <br /> <br />Part of the decrease in unit discharge as the river proceeds down- <br /> <br />stream can be attributed to exports from the reg1on, depletions for irri- <br /> <br />gation and other consumptive uses, losses to groundwater recharge, trans- <br /> <br />. <br /> <br />piration, and evaporation. However, most of the decrease is due simply <br /> <br />to 10wer contribution from the downstream areas (see Figure III-2). <br /> <br />. <br /> <br />Large variations in annual discharge occur also from year to year <br /> <br />due to yearly variations in precipitation, and over periods of years due <br /> <br />to long-term climatic trends. The average annual discharge of the <br /> <br />. <br /> <br />Colorado River at Lee Ferry was l2, 426, 000 acre-feet for the 52-year <br /> <br />period 1914- 65, with extremes of 21,894,000 acre-feet in 1917 and 4,396,000 <br /> <br />. <br /> <br />acre-feet in 1934. For the l7-year period 19l4-30, the average discharge <br /> <br />16 <br /> <br />. <br />