HYDROLOGY OF NEW YORK 



521 



does not quite represent the conditions in New York State as 

 regards the relation between population and area. If we con- 

 sider that there are thirty-seven cities included in the preceding 

 area of 23,140 square miles, in which there is a population of 

 4,302,000 on about 1000 square miles, or at the average rate of 

 something like 4300 per square mile, we learn that on the 23,440 

 square miles the purely rural population may be taken in 1900 at 

 1,904,000, which rural population is again situated on about 

 22,400 square miles, or at the average rate of about 84 per square 

 mile. 



The foregoing review of the statistics of population in New 

 York indicates the present tendency to concentrate in cities. Un- 

 doubtedly, such tendency will be considerably accentuated in the 

 future. The clear tend of perhaps one-half of New York State 

 to become a great manufacturing district will lead to this result. 



In the year 2000 it is probable that a relatively larger propor- 

 tion of the population will be located in the river valleys than 

 at present. Time will not be taken to discuss the conditions in 

 each valley, but the Mohawk valley will be briefly referred to as 

 illustrating conditions in several of the more important river 

 valleys. 



The catchment area of Mohawk river is 3468 square miles and 

 the population of nineteen principal towns situated therein was 

 in 1900, 215,539. These towns are all large enough to have sewer- 

 age works at the present time. They are manufacturing towns 

 and are growing rapidly. If they were to increase in the same 

 proportion as the whole State, the population in the year 2000 

 would be something like 600,000, but undoubtedly they will in- 

 crease much more rapidly than the whole State and Ave w T ill not 

 be far from right if we take the population in the year 2000 at 

 1.000.000. Moreover, this urban population will not be scattered 

 over the whole 3468 square miles, but will be concentrated on 

 perhaps 1200 square miles. The average population will, there- 

 fore, be. aside from the denser population of the cities, over 800 

 per square mile. Approximately the same average conditions will 

 obtain on about 20,000 square miles of the State. 



With an average population of over 800 per square mile on 

 20,000 square miles, the 20.000 square miles will have become 

 urban and sub-urban area, with water supply and sewerage in 



