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NEW YORK STATE MUSEUM 



at least 457 cubic feet per second is allowed to flow continually 

 at Portage and at least 1000 cubic feet per second is always flow- 

 ing at Kochester in addition to the amount required for canal 

 purposes. The figures given in column (2) show the proposed 

 minimum flow at Kochester, this being the 1000 cubic feet per 

 second noted above, together with 80 cubic feet per second for 

 the canal for the months from June to November, inclusive, and 

 177 cubic feet per second for the month of May. Columns (3) 

 and (4) give the discharges at Rochester and Portage under 

 natural conditions. Column (5) gives the difference between 

 these, or the quantity of water entering the river below Portage. 

 Column (6) gives the amount which goes to the canal while 

 column (7) gives the ratio of amount to canal to actual flow. 

 Column (S) gives the minimum amount to be added at Portage in 

 order to maintain the proposed minimum flow at Rochester of 

 1000 cubic feet per second, not including the amount taken by the 

 canal. The quantity available at Rochester for power purposes 

 is shown in column (9). The actual outflow from the Portage 

 reservoir is given in column (10) in cubic feet per second, while 

 column (12) gives the same thing in inches on the catchment area. 

 Column (11) gives the surplus flowing over the spillway at the 

 Portage reservoir. 



Table Xo. S5 exhibits the condition of the reservoir from month 

 to month under the above conditions. The figures are given not 

 in cubic content but in equivalent depth in inches on the total 

 tributary catchment of 1000 square miles. The reservoir is as- 

 sumed to be full at the beginning of June 1894, the total storage 

 of the reservoir being equivalent to 6.46 inches in depth on the 

 catchment area. The total waste from June 1, 1894, to December 

 1, 1896, equals, under the conditions of this table, 2.11 inches on 

 the catchment. 



Similar tables have been computed showing the regulation of 

 the river as affected by the storage at Portage of 7,500,000,000 

 cubic feet of water for the same period, with at least 300 cubic 

 feet per second always flowiDg at Portage, and at least 600 cubic 

 feet per second at Rochester, in addition to the amount required 

 for the canal. The chief difference between these two tables is in 

 the amount of water utilized. In the case of a reservoir of 

 15,000,000,000 cubic feet capacity, during only three months of 



