ILLUSTRATIONS. 



PLATES. 



Page. 



Plate I. Map of Platte River and tributaries — 10 



II. Fig. 1.— A characteristic seepage ditch. Fig. 2.— Seeped sugar- 

 beet field 50 



III. Skyline ditch, carrying water from Laramie River drainage to 



Cache la Poudre drainage 66 



IV. Fig. 1 .—North Platte River at Guernsey Canyon. Fig. 2.— North 



Platte River near Douglas, showing character of stream bed. . _ 72 



TEXT FIGURES. 



Fig. 1 . Altitude and precipitation at points in valley of South Platte and 



Platte rivers . . 1^ 



2. Altitude and precipitation at points in valley of North Platte and 



Platte rivers . 1^ 



3. Diagram comparing volume of return seepage to South Platte River 



for two seven-year periods, 1889-1895 and 1896-1903, excluding 

 1897 51 



(i) 



