DRAINAGE 



93 



than at the bottom, which is undesirable. Tile should be 



fitted together so that 



there are no cracks over 



34 inch wide. Small holes 



at the joints may be cov- 

 ered by broken pieces of 



tile. 



In digging the ditch 



and laying the tile, the 



work should always begin 



at the outlet. The tile 



should be laid as fast as 



the ditch is dug, to pre- 

 vent the destruction of 



the ditch by rain. This 



would happen if the water 



should be allowed to flow 



down the unprotected 



ditch. In most soils, the 



open ditches are quite 



likely to cave in if left 



open during rain storms. 



Laterals should be joined to a main by "Y" connections 



furnished by the tile manufacturers. The cheapness of these 



connections does not justify 

 the work of cutting tile to 

 form a connection. Laterals 

 should enter the main at as 

 sharp an angle as convenient. 

 When the connection is made 



method of joining lateral drains to a ^ Tight angles, the tlOW 01 

 mains. From Ohio Exten. Bui. 47. ^ water fr()m ^ lateralg 



has a tendency to check the flow of the water in the mains. 



Fig-. 59. Laying tile with the tile hook. 



