juiy3o, I9I7 Evaporation from Water and River-Bed Materials 259 



from approximately the same point at^ which sample 9 was collected, 

 was 61 per cent of that from a water surface. The 60 per cent size for 

 that material, No. 9, as shown by figure 8, is 0.049 inch. From the 

 upper curve of figure 12 the evaporation percentage corresponding 

 to 0.049 inch is 67. Considering the fact that the North Platte work 

 was done by means of tanks only 8 inches in diameter and the com- 



/$ 





^ 



k 



M 



(2 16 3) E4 88 3Z 56 

 Depth to Wat^rtablejnches 



^ ^ 52 



Fig. 13.— Moisture percentage in top 4 inches of Laboratory soil with water table at different depths. 



parison made with a water surface tank in which the water was 2 

 inches deep, this check is considered close. Table XXVI will aid in 

 the use of these data. 



LITERATURE CITED 

 (i) Abbe, Cleveland. 



1905. THE PiCHE EVAPOROMETER. In Mo. Weather Rev., v. 33, no. 6, p. 



253-255- 



(2) BiGELOW, F. H. 



igo8. STUDIES ON THE PHENOMENA OF THE EVAPORATION OP WATER OVER 

 LAKES AND RESERVOIRS. II. OBSERVATIONS ON EVAPORATION MADE 

 AT THE RESERVOIR IN RENO, NEVADA, AUGUST I TO SEPTEMBER 15, 



1907. In Mo. Weather Rev., v. 36, no. 2, p. 24-39, ^Z- ^~5> 21-22, 

 28-31. 



(3) ■ 



191O. STUDIES ON THE PHENOMENA O? THE EVAPORATION OF WATER OVER 

 LAKES AND RESERVOIRS. VII. SUMMARY OF THE RESULTS OF THE 



SALTON SEA CAMPAIGN. Jn Mo. Weather Rev., v. 38, no. 7, p. 1133- 



1135- 



(4) Carpenter, L. G. 



1898. the loss of water from reservoirs by seepage and evaporation. 

 Colo. Agr. Exp. Sta. Bui. 45, 32 p. 

 Cites Debauve (p. 25). 



