GENERAL DRAINAGE INFORMATION 



85 



of the diameter is the product 

 of the diameter multiplied by 

 itself. When water in them has 

 the same rate of flow, 3-ineh 

 tile will carry 2 J times as much 

 water, as will 2-inch tile. To 

 illustrate : 3X3 = 9, 2X2 = 4; 

 9 is 2j times 4; 2j represents 

 the relation of the amount of 

 water that will flow through 

 3-inch tile as compared with the 

 amount of water that will flow 

 through 2-inch tile when they 

 have the same fall. A 5-inch 

 tile will carry 1^ times as much 

 water at the same rate of flow 

 as a 4-inch tile. To illustrate 

 again : the square of 5 is 25, 

 the square of 4 is 16, 25 divided 

 by 16 equals 1^-. 



The size of tile to be used in 

 any instance will depend on the 

 area from which it is to carry 

 water, and whether it is to carry 

 away only the excess of water 

 due to rainfall on the area, or 

 whether there is added other 

 water brought in by springs, or 

 surface drainage, or seepage 

 from adjacent areas. 



It is hardly advisable to use 

 tile so small as 2 inches in 

 diameter. The following gen- 



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