THE PLOW MAY BE USED TO FACILITATE THE REMOVAL OF 

 SURFACE SOIL FOR DRAINS 



Usually, however, the work is done entirely with a ditching spade 



77. OUTLET OF A TILE DRAIN CLOGGED BY SOIL SO THAT 

 THE DRAIN DOES NOT WORK 



It should be kept free of all obstructions, and is preferably bricked up. A wire screen 

 keeps out small animals that might obstruct the drain 



