HYDROLOGY OF NEW YORK 



405 



the flood-flows for April, 1809, the flows having been corrected by 

 the use of the Cornell coefficients in the manner already described : 



Name of stream 



Catchment 

 area, 

 square miles 



Flood flow, 

 cubic feet 

 per second 



Otter 



63.0 



1,944 



Independence 



93.2 



6,200 





322.3 



5,382 





101.0 



7,881 



Black 



878.5 



40,400 



Total 



1458.0 



61,807 



From the preceding tabulation it appears that a catchment 

 area of 1458 square miles yielded a maximum flood-flow about 

 April 22, 1S69, of 61.S07 cubic feet per second, or at the rate of 

 42.3 cubic feet per second per square mile. The total area above 

 Carthage, however, is 1812.2 square miles. Assuming the same 

 average flow from the balance of the catchment area as from the 

 145S square miles included in the streams tabulated, it follows 

 that the total inflow to the pond area between Carthage and 

 Lyon Falls was at the rate of 75,830 cubic feet per second. The 

 greatest flow at Carthage, which occurred April 23, 1869, was only 

 39,529 cubic feet per second, the effect of the temporary pondage 

 above that place having been to reduce the flood from about 

 76,000 cubic feet per second to about 40,000 cubic feet per second. 



Inasmuch as there are no affluents to the stream below 

 Cartilage, there is no special reason why the flood-flow below that 

 place should have any higher rate than at Carthage. The reported 

 flow at Watertown in April, 1869, of 39,696 cubic feet per second 

 is, therefore, considered as fairly justifying tu e Carthage figure. 

 A comparison of the two shows at any rate that the error is not 

 likely to be more than a few per cent. 



On April 21, 1900, the calculated discharge over the Hunting- 

 tonville dam was 30,150 cubic feet per second (catchment, 1889 

 square miles), or at the rate of about 16 cubic feet per second 

 per square mile. December 15, 1901, there was a. flood with a cal- 

 culated discharge of 37,000 cubic feet per second, or 19.2 cubic 

 feet per second per square mile. 



