HYDROLOGY OF NEW YORK 



417 



The coefficients derived from Cornell University experiment Xo. 

 14 have been used in computing the flow over this dam. The flow 

 of Oriskany creek represents the natural runoff of the tributary 

 catchment modified by pond storage, with additional flow during 

 the summer months due to diversion from storage reservoirs on the 

 Chenango river catchment, through the summit level of the aban- 

 doned Chenango canal, into Oriskany creek. The natural catch- 

 ment area above the gaging station is 144 square miles, while that 

 of the Chenango river, made partially tributary through Chenango 

 canal, is 87 square miles. The effective catchment area during 

 the navigation season is therefore 231 square miles, while the 

 effective catchment area with canals closed is 144 square miles, 

 less the storage of the several reservoirs. These reservoirs are 

 situated in Madison, Eaton, Xelson and Lebanon townships in 

 Madison county, and include Hatch lake, Eaton brook, Bradley 

 brook, Leland pond, Madison brook and Kingsley brook reservoirs. 

 Their main characteristics and storage capacity in cubic feet are 

 shown by the following tabulation : 



Name of reservoir 



Catchment 

 area, 

 square 

 miles 



Distance 

 to Erie 

 canal, 

 miles 



Storage 

 depth, 

 feet 



Average 

 surface 



area. 



acres 



Storage 

 capacity, 

 cubic feet 



(1) 



Hatch lake 



Eaton brook 



Bradley brook 



Leland pond 



Madison brook 



Kingslev brook 



Total storage 



(2) 



(8) 



(4) 



(5) 



(6) 



10.6 

 9.4 



36 

 38 

 35 

 25 

 29 

 33 



10 

 50 

 25 

 8 

 40 

 20 



134 

 254 

 134 

 173 

 235 

 113 



58, 370, 400 

 553.212,000 

 145,926,000 



59, 287, 000 

 460, 647, 000 



98,445,600 











1,375,887,000 













In examining tables Xos. 76 and 77 it will be seen that the runoff 

 of Oriskany creek is considerably larger than the adjacent Sau- 

 quoit creek, but on making the proper deductions for these reser- 

 voirs the two will be found to be substantially the same. 



Geologically this stream lies in the horizon of the Hamilton 

 shales, crossing the Helderberg and Salina groups. 



