94 



SEWER DESIGN 



The values of these predictions can now be tested and shown 

 to be reasonably accurate. 



1800 



1850 1900 



YEAR. 

 FIG. 17. 



2,500,000 



2,000,000 



1,500,000 



1,000,000 (2 



200,000 



FIG. 1 8. 



000,000 

 800,000 

 700,000 



z 



600,000 O 

 500,000 j 

 400,000 O 

 300,000 

 200,000 

 100,000 



The census population for 1900 and for 1910 for Chicago 

 was 1,698,575 and 2,185,283, while the lower branch of the 



