98 ILLINOIS ACADEMY OF SCIENCE 



The law has been modified from time to time by amend- 

 ments which include acts conferring police power, allow- 

 ing additional taxation for specific times and purposes, 

 changing the limit of bonded indebtedness, providing for 

 a minimum flow depending upon the population of the 

 district, authorizing enlargement of the district, provid- 

 ing for converting power available into electric energy, 

 and amending sections in regard to the election of trus- 

 tees. 



The primary purpose of the work of the Sanitary Dis- 

 trict of Chicago has been sanitation and sanitary con- 

 ditions have been greatly improved. It constructed the 

 canal from Robey St., Chicago, to Lockport, and diverted 

 sewage from Lake Michigan to this channel, through 

 which it flows to Des Plaines River and thence to Illinois 

 River. A channel has been cut from the lake at Wilmette 

 southward to a connection in the North Branch of Chi- 

 cago River and a channel known as the Calumet Sag 

 Channel is being constructed to drain areas in the south- 

 ern part of the district. Investigations have been made 

 of methods of treating sewage and experimental sewage 

 treatment plants have been operated. Chicago River has 

 been deepened and widened and obstructions have been 

 removed, and valuable water power has been developed. 



The title and certain provisions of the act under which 

 the Sanitary District of Chicago was formed practically 

 limit the application of the act to that district. 



KOETH SHOEE SANITARY DISTEICT 



In April, 1914, the North Shore Sanitary District was 

 created in accordance with *'An Act to create sanitary 

 districts, and to provide for sewage disposal." This act, 

 passed and approved in 1911, and amended in 1913, 1915 

 and 1919, pro\ddes for the creation of sanitary districts 

 in territories within one county, including two or more 

 incorporated cities, towns or villages o^\TLing and operat- 

 ing either or any of them, a system or systems of water- 

 works and procuring a supply of water from Lake Mich- 

 igan. 



