262 



THE PRINCIPLES OF SOIL MANAGEMENT 



against the entrance of animals. (5) Free flow of 

 water from the outlet. (6) Close joints, which may be 

 more easily attained with round or hexagonal than with 





Fig. 93. A poorly constructed outlet for a line of drain tile. 



U or soft tile. (7) Junctions should be made at an acute 

 rather than at a right angle. (8) On hilly land the drain 

 should run with the slope, as far as possible. (9) In 

 general, the fall should be as great as the surface fea- 



