ON THE FLOW OF WATER IN PIPES, CONDUITS, ETC. 



183 



In Table VI are recorded the values of the constants p., \, p, and q 

 corresponding to each class. While Table V constitutes the best identifi- 

 cation of the channels in each class, the descriptions given there of the 

 channels entered are but meager abbreviations of the more detailed and 

 complete descriptions given by the original authorities. It is important in 

 the application to be able to assign to its proper class the given proposed 

 channel for which the velocity is to be determined and this under any 

 circumstances is dependent largely on the judgTnent and experience of the 

 engineer. 



TABLE VI. 



The following is an effort to express in words the nature of the channels 

 belonging to the individual classes.* 



Class 1. 



Smooth straight tin pipes, straight tin liaed pipes under best con- 

 ditions. 



Class 2. 



New straight wrought iron pipes coated with asphalt, under best con- 

 ditions. Wooden pipes, straight and very smooth, closely jointed with 

 hydraulic radius from .3 to .5 feet. Tin lined pipes with easy curvature. 



* The writer regrets being unable to place in the proper classification the wooden 

 stave pipes of large diameter now used in the Western United States; he was unable 

 to obtain data of the results of observations on these conduits. 



