CONTENTS 



PAGES 



Material for the drains 239 



The outlet 240 



Locating main and branches 240 



The laterals 241 



Size of tile 241 



Kind of tile 242 



The grade 243 



Establishing a grade 243 



Cutting the trenches 244 



Depth of trenches 245 



Connections 245 



Permanency desired 246 



