HYDROLOGY OF NEW YORK 



755 



diverted to the north, and 108 cubic feet per second, less the loss 

 from evaporation, etc., is returned to the river at the Saratoga 

 dam. 



Taking into account the losses from evaporation and absorp- 

 tion by vegetation during the summer months, we may place the 

 demands for the Champlain canal during the months of canal 

 navigation at the following approximate monthly means. These 

 figures are roughly proportional to evaporation from a water 

 surface: „ . 4 



Cubic feet 

 per second 



May 553 



June 600 



July 600 



August 600 



September 553 



October 510 



November 495 



With the leakage of the Glens Falls feeder done away with, the 

 foregoing figures may be reduced about 200 cubic feet per second 

 for each month. For the section of the Champlain canal from 



J362-/S99 



-gjgrr 



CAPAC/TY 8.00O BUSHELS OF WHEAT 



240 TONS 



m 



Fig. 52 Boat used after enlargement was completed in 1862. 



Northumberland to Oohoes we may assume the water supply of 

 the enlarged canal at about 255 cubic feet per second in May, 

 October, and November, and at about 280 to 290 cubic feet per 

 second in June, July, August and September. 



Middle division of Eric canal. This division comprises that 

 portion of the Erie canal lying between the east line of Oneida 

 county and the east line of Wayne county, as well as the Oswego 

 canal from Syracuse to Oswego, the Baldwinsville side cut, the 

 Oayuga and Seneca canal, the Black Kiver canal, and other short 



