July 30, 191 7 Evaporation from Water and River-Bed Materials 251 



Table XIX. — Actual evaporation from Cherry Creek sand, No. 10, with wafer table 

 at different depths below the material surface. All tanks i.g6feet in diameter 



Period ending < 



Aug. 4 



9 



12 



15 



17 



29 



Sept. 12 



25 



29 



Oct. 4 



10 



16 



Total 



Percentage ^ 



Actual depth of water evaporated (inches). 



Evapora- 

 tion from 

 water sur- 

 face tank 



2(2 feet 

 diameter 

 and 3 feet 



deep). 



I. 01 



I. 12 



•85 



.69 



•54 

 3-54 

 4.44 



2.83 

 .91 



1.23 

 •99 



18.93 

 100. o 



Water table below the sand surface. 



o (satura- 

 tion). 



0.45 

 I. 23 



•75 

 .40 

 .68 



2- SI 



3- 14 

 2.34 



.46 

 I. 06 



•SI 

 I. 04 



14-57 

 77.0 



3 inches. 



0. 62 



1. 07 

 .90 



•35 



•34 



2- 54 



2. 71 

 2. 16 



.42 

 .69 

 •54 

 .62 



13.06 

 69. o 



6 inches. 



O. 67 

 .80 

 .80 

 •32 

 •29 



2. 42 



2. 62 



2. 06 



.40 



.67 



•54 

 .62 



12. 21 

 64-5 



io5-2 inches, 



0. 50 

 •74 

 .69 

 .28 

 . 21 



2. 22 

 2.47 



1. 82 

 •36 

 •63 

 • 5° 

 •50 



10. 92 



57-7 



24 inches. 



o. 19 



• 15 

 . 18 

 .04 

 .04 

 .80 



•34 

 .25 

 . 12 

 . 00 

 . 00 

 . 16 



27 

 3 



The period began on July 31, 1916. 



* Water surface taken as 100 per cent. 



Table XX. — Actual evaporation from laboratory soil with wat-er table at different depths 

 below the soil surface. Experimental tanks 1.0 feet in diameter 



Period ending ' 



Aug. 30 



Sept. 15 



25 



29 



Oct. 4 



Total 



Percentage & 



Actual depth of water evaporated (inches). 



Evapora- 

 tion from 

 water sur- 

 face of tank 

 2 (2 feet in 

 diameter). 



3-84 

 4-77 

 2. 10 

 .91 

 1.23 



12.85 

 100. o 



Water table below the soil surface. 



4 

 inches. 



4-37 

 I. 81 

 I. 04 

 I. 14 



11-34 

 88.2 



16 

 inches. 



2. 69 



4. 09 



I. 67 



.84 



•97 



10. 26 

 79.8 



28 

 inches. 



2. 19 



3. 12 

 1-44 



.69 

 •58 



8.02 

 62. 4 



38 

 inches. 



I. 23 



1.98 



•30 



-43 



•30 



4.24 

 33-0 



. 43 

 mches. 



D. 24 



•37 

 . 16 

 . II 

 . 10 



7-63 



5oJ4 

 inches. 



O. 19 



•32 

 . 16 

 . 16 

 . 10 



•93 

 7.24 



«■ The period began on Aug. 17, 1916. 



b Water surface taken as 100 per cent. 



