DRAINAGE 



157 



an intimate acquaintance with the character of the sub- 

 soil, experience in calculating and in judging what size 

 to make open ditches and what size of drain tiles to use. 



Figure 57. Surveyor's transit. 



He should also have tactful ability to deal with the 

 parties interested in co-operative drainage, and this is 

 quite as much needed in the enterprise as his technical 

 knowledge. 



