HYDROLOGY OF NEW YOKK 



505 



moiit and Massachusetts, and frequently there are rainfalls in this 

 region when there are none on the Hudson river above Fort 

 Edward. This fact renders it impossible to predicate what will 

 happen on this part of the stream from the record at Mechanic- 

 ville. 



A record of the flow of the river has been kept at Fort Edward 

 from December, 1895, to the present time, which is given to 

 November, 1902, inclusive, in table No. 63. In August, 1899, the 

 mean flow for the month at Fort Edward was 711 cubic feet per 

 second (catchment, 2800 square miles), or at the rate of 0.26 

 cubic foot per second per square mile. For fourteen days in Sep- 

 tember, 1899, the mean flow was at the rate of 661 cubic feet per 

 second or 0.24 cubic foot per second per square mile. Probably, 

 in some extreme dry time, the Mow at Fort Edward will not 

 exceed 0.2 cubic foot per second per square mile, as the evidence 

 is clear that 1899, while exceedingly dry, was not the minimum 

 dry year. The statements in regard to the reliability of the gag- 

 ings, made on a preceding page, may, however, be taken into 

 account in considering the minimum flows at this place. 



Minimum flow of Croton river. The daily record of this stream 

 is not available, the flows being given for an entire month. The 

 following are the monthly means for the lowest flows : 



In August, 1869, the flow for the entire month was 90 cubic feet 

 per second; in September of that year, it was 54 cubic feet per 

 second. The mean flow, therefore, for two months was 72 cubic 

 feet per second (catchment, 339 square miles), or at the rate of 

 0.21 cubic foot per second per square mile. 



In September, 1870, the mean flow was 97 cubic feet per second 

 and in October, 111 cubic feet per second. 



The following are the flows for the growing period of 1877 : 



Cubic feet 

 per second 



June . 

 July .. 

 August 



159 

 130 

 127 



Mean 



138 



The flow for September, 1877, was 93 cubic feet per second. 



