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<br />LIST OF FIGURES AND TABLES <br /> <br />Figure <br /> <br />1 The Upper Colorado River Basin (after Upper Colorado River Commission [7]) <br /> <br />2 The highly smoothed topography of the Upper Colorado River Basin (in units <br />of 1000'saf feet). (After Rasmussen, J.L. [8]) <br /> <br />3 Annual and spring runoff at Lees Ferry, Arizona. <br /> <br />4 Annual, winter, and monthly precipitation for some stations in the two <br />pilot areas . <br /> <br />5 Annual, spring, and monthly runoff for some stations in the two pilots areas. <br /> <br />6 Pilot area <br /> <br />7 Mean winter precipitation (in inches) <br /> <br />8 Mean spring runoff (in inches). <br /> <br />9 Expected increase in spring runoff due to a uniform 10% increase in winter <br />precipitation (in inches) <br /> <br />10 Nwnber of years needed for evaluation (based on the two-sample u-test) <br /> <br />11 Length of runoff records in the pilot area <br /> <br />12 Minimwn nwnber of years needed for evaluation for grouped basins in the <br />pilot area <br /> <br />Table <br /> <br />Correlation coefficient, (r) between winter and spring precipitation <br /> <br />2 Station characteristics in the pilot area 24 <br /> <br />3 Covariance matrix of spring runoff of stations in the pilot area 25 <br /> <br />4 Optimal combinations of gages for various group sizes 26 <br /> <br />Page <br /> 3 <br /> 4 <br /> 5 <br />5 - 7 <br />8 12 <br />12 13 <br /> 19 <br /> 20 <br /> 22 <br /> 23 <br /> 25 <br />27 - 28 <br /> <br />18 <br /> <br />5 10 best combinations of sub-basins in the San Juan Mountains 29 - 32 <br /> <br />6 10 best combinations of sub-basins in the Upper Basin of the Colorado River. 33 - 37 <br /> <br />7 Sensitivity of nwnber of years for evaluation according to change of <br />coefficients. 37 - 38 <br /> <br />8 Sensitivity of nwnber of years for evaluation according to change of <br />covariance matrix . 39 <br /> <br />v <br />