HYDROLOGY OF NEW YORK 



In July, 1900, the mean flow was 720 cubic feet per second; 

 in August, 551 cubic feet per second, and in September, 471 cubic 

 feet per second. 



Since the catchment area at Baldwinsville is 3103 square miles, 

 the flow for the entire month of August, 1899, of 455 cubic feet 

 per second was at the rate of less than 0.15 cubic foot per second 

 per square mile. For several days in August and September, 1899, 

 the flow was very much smaller than the average, but it does not 

 seem proper to consider the flow of single days in estimating the 

 minimum flow of a stream like Seneca river. The small summer 

 flows in this stream are largely due to heavy evaporation from 

 the marsh areas above Baldwinsville. 



Minimum floic of west branch of Fish creek. In July, 1900, 

 the mean flow of this stream for the entire month at McConnells- 

 ville was 60 cubic feet per second, and in August it was 57 cubic 

 feet per second (catchment, 187 square miles), or the flow for 

 these two months was at the rate of about 0.3 cubic foot per 

 second per square mile. Undoubtedly the extreme minimum flows 

 of this stream are less than 0.2 cubic foot per second per square 

 mile, since for six days in December, 1900, the mean flow was only 

 36 cubic feet pea? second or at the rate of 0.19 cubic foot per second 

 per square mile. It is possible that the extreme minimum may 

 perhaps be placed as low as 0.12 cubic foot per second per square 

 mile for a week at a time. 



Minimum ffoic of Salmon river west. The lowest recorded flow 

 of this stream is 75 cubic feet per second for five days in Sep- 

 tember, 1900. Since the catchment area at Pulaski, where the 

 measurements are made, is 264 square miles, this flow would be 

 at the rate of 0.28 cubic foot per second per square mile. Prob- 

 ably the extreme minimum flow of this stream will go as low as 

 0.22 cubic foot per second per square mile. 



There are a number of streams to the north of Salmon river, be- 

 tween there and Black river, as for instance the north branch of 

 Sandy creek, of which the minimum flows are exceedingly small. 

 As observed by the writer in the fall of 1898 these streams were 

 substantially dry, the flow of several of them not exceeding 20 

 cubic feet per second. Their minimum flows are as low as 0.05 

 cubic foot per second per square mile. Their headwaters lie in a 

 deforested country in the horizon of the Hudson river shales and 

 Trenton limestone. 



