PREPARATORY MAPS AND DATA 



27 



upon the plans in suitable symbols appropriately "referenced" in the 

 title. The sizes and gradients of all proposed sewers, and of existing 

 sewers, must be marked appropriately along sewer-lines between all 

 consecutive manholes or flush-tanks, with arrows showing the direction 



FIG. 4. 



of flow. All sewers and other appurtenances must be shown by black 

 lines and conventional signs, and not by colors. As an example of 

 the lettering to be used at a street intersection, the following sketch is 

 offered.* 



3. Profiles. Profiles upon separate sheets, showing all sewers 12 

 inches or more in diameter, and all main intercepting and outfall sewers 



* Plate loaned by Theodore Horton, Chief Engineer, N. Y. State Dept. of 

 Health. 



