506 



NEW YORK STATE MUSEUM 



Iii the water year, 1880, the flow for the growing and replenish- 

 ing periods was as follows : 



Cubic feet 

 per second 



June 138 



July 138 



August 132 



September 132 



October 130 



November 152 



Mean 137 



The flow for the following month of December was 138 cubic 

 feet per second. The entire flow for the water year 1880 was 365 

 cubic feet per second. 



In the year 1881 the mean flow for the replenishing period was 

 129 cubic feet per second. 



In the year 1883 the mean flow for the entire year was 363 

 cubic feet per second. Attention may be directed to the fact 

 that the flow of the storage period will chiefly determine 

 whether the mean flow for the whole year is large or small. Thus, 

 in 1880, the mean flow for the storage period was 592 cubic feet 

 per second and in 1883, 572 cubic feet per second. The maximum 

 flow of the storage period from 1868-1899, inclusive, occurred in 

 1888 and was 1137 cubic feet per second. In 1888 the mean flow 

 for the entire year was 838 cubic feet per second, which is the 

 maximum mean yearly flow for the entire period covered by the 

 gagings. 



The lowest mean monthly flow for the entire period was in Sep- 

 tember, 1869, and was 54 cubic feet per second, or at the rale of 

 0.16 cubic foot per second per square mile. Probably the flow of 

 Hie Croton river for several days during these periods did not 

 exceed 0.1 cubic foot per second per square mile. 



According to J. J. R. Croes, the minimum How of the west 

 branch of the Croton river, with a catchment area of 20.4 square 

 miles, is 0.02 cubic foot per second per square mile. 



Minimum flow of Fishkill creek. The lowest flow of this stream 

 thus far observed was on August 26, 1902, and was at the rate of 



