Water Lost by Percolation 



113 



water in the ground is found at greater distances below the sur- 

 face : 



Table showing the per cent of water in 8-foot columns of sand after percolation 

 periods of different lengths 



Effective diameter of sand 



.474mm. .185mm. .155mm. .1143 mm. .0826mm. 



Water retained after percolating over 2 years 



PER CENT PER CENT PER CENT PER CENT PER CENT 



.17 

 .17 

 .16 

 .15 



.18 

 .19 

 .26 

 .58 



1.16 

 1.45 

 1.67 

 1.80 



1.86 

 1.87 

 1.98 

 1.92 



2.12 

 2.07 

 2.18 

 2.29 



2.48 

 2.65 

 3.14 

 3.63 



4.71 

 6.76 

 9.38 

 14.66 



21.31 

 22.39 

 23.52 

 2461 



.22 

 .23 

 .29 

 .32 



.61 

 1.07 

 1.33 

 1.57 



1.80 

 1.85 

 2.03 

 2.18 



2.26 

 2.27 

 2.30 

 2.38 



2.46 

 2.71 

 3.08 

 3.46 



4.10 

 5.09 

 6.36 



8.74 



13.52 

 23.57 

 27.93 

 23.61 



22.46 

 2276 

 22.88 

 23.54 



1.26 



1.10 

 1.34 

 1.61 



1.98 

 2.32 

 2.61 

 2.90 



3.12 

 3.36 

 3.56 

 3.92 



4.22 

 4.53 

 4.88 

 5.42 



6.03 

 6.99 



7.47 

 8.71 



10.54 

 11.77 

 12.95 

 15.05 



17.24 

 19.08 

 19.37 

 21.44 



22.69 

 23.20 

 24.22 

 25.07 



3.44 

 3.44 

 3.82 

 3.83 



3.93 

 4.19 

 4.38 

 4.92 



4.94 

 5.70 

 5.91 

 6.43 



6.77 

 7.72 

 8.59 

 9.42 



10.50 

 11.34 



12.58 

 13 



1495 

 15.90 

 17.20 

 17.96 



18.92 

 20.49 

 21.34 

 21.63 



22.68 

 23.39 

 3028 

 24.06 



H 



