LUTHER BURBANK 



properly. This was accomplished by running a 

 main line of four-inch tiles down the center of the 

 tract with laterals of two-inch tiles joining it at 

 right angles at intervals of forty feet. The lat- 

 erals gather surplus water quickly after heavy 

 rain, and the main pipe carries it to a small stream 

 nearby. The slope of the pipes is one foot in forty 

 feet. 



THE WOKLD'S MOST PKODUCTIVE ACEES 



At first thought it seems rather surprising that 

 two-inch pipes forty feet apart will adequately 

 drain a moist soil. But Mr. Burbank points out 

 that the drainage pipes are working day and 

 night, with no rest on Sundays, and that they carry 

 a great amount of water in the course of twenty- 

 four hours. In point of fact, this system of two- 

 inch laterals with a four-inch central pipe proved 

 eminently satisfactory at Santa Rosa from the 

 outset, and no change has been necessary in 

 the thirty years it has been in operation. 

 The pipes require no attention whatever, they 

 have never been even inspected since they were 

 put down. 



It is of course highly essential that each piece 

 of tiling as originally laid should be perfect, and 

 that the entire system should be carefully ad- 

 justed at the proper grade. The joints should be 

 packed with clay. If any part of the line sags, 

 sediment will collect and retard the flow of water. 



By the mere installation of this simple system 



[178] 



