MODERN METHODS OF STREET CLEANING 



all times. The rise and fall of tide at Amsterdam is 

 normally about 5 feet. 



With the obstacles presented by the low lying situa- 

 tion of the city, the unstable condition of the soil and 

 the network of canals, it is not strange that unusual 

 difficulties should attend the collection and disposal 

 of the city's wastes. Nearly every system known for 

 handling human excrement has been employed here 

 upon a scale sufficient to give it a practical trial. 



At present the largest part of the city, including the 

 Disposal of oldest section at the center, discharges its 

 sewage sewage into the canals. There are about 4000 

 buildings in this quarter, however, where the excre- 

 ment is collected in tubs which are emptied at night 

 into carts very much as kitchen garbage is emptied in 

 American cities. 



The Liernur system of sewerage in which the carry- 

 ing office of water is replaced by powerful suction applied 

 at a central station, serves about 6400 buildings. Am- 

 sterdam has the largest installation of sewerage on this 

 principal in existence. In addition to the above men- 

 tioned number of buildings served by the permanent 

 Liernur system, there are about 6400 buildings which 

 are connected with a part of the Liernur system which 

 is considered temporary. The total number of inhabi- 

 tants served by the Liernur sewerage works is 100,000. 



There are 290 buildings supplied with excrement bar- 

 rels that are removed periodically, but not as fre- 

 quently as once each day. 



Finally, 3000 buildings are supplied with Monier pits 

 with overflows to the canals. 



It is proposed to build a sewerage system on modern 

 lines for part of the old city and to provide for the 



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