LUTHER BURBANK 



In the twenty years since the tile system was 

 laid at Santa Rosa, the tile itself has never been 

 exposed, or in any way touched or examined. It 

 continues to perform its function perfectly. 



Drainage is really a science in itself, and there 

 is not enough space here to give a full discussion 

 of it. There are a number of good books upon 

 the subject, however, and the names of these will 

 be found in the chapter on reference literature. 



Before the system is installed, some complete 

 treatise on drainage should be thoroughly studied. 



In some cases it is possible to secure the aid of 

 a person who has had experience in laying drain 

 tiles, and where this is possible it is the best plan. 

 SUPPLYING WATER 



Irrigation is closely allied to drainage. The 

 two systems are for a similar purpose to regulate 

 the amount of moisture in the soil for plant growth. 



Irrigation is needed in locations where there 

 is not sufficient rainfall to insure the growth of cer- 

 tain crops. In many places also where the rainfall 

 is sufficient but not well distributed, irrigation will 

 be profitable, especially in seasons of unusual 

 drouth. 



For large tracts such as orchards and extensive 

 seed and vegetable gardens, the common practice 

 is to run water in large ditches with a system of 

 smaller ditches throughout the field. 



[252] 



