630 NEW YORK STATE MUSEUM 



designed on the basis of giving to the stream at least 0.5 inch 

 on the catchment area per month. 1 With 0.45 cubic foot per 

 second per square mile always flowing away from the controlled 

 catchment area, the natural flow of the unregulated portion will 

 usually furnish an additional amount sufficient to keep the river, 

 during the storage period, up to nearly the assumed 4500 cubic 

 feet per second at Mechanicville ; or in case of extreme low water 

 in winter other reservoirs may be relied upon to assist in the 

 manner already pointed out. 



On the basis of 12 to 14 inches available storage, there may be, 

 with 0.5 inch per month always going to the stream, a possible 

 total requirement for the year of from 15 to 18 inches. 



Table No. 61 shows that the total flow for the year 1895 was 

 only 17.46 inches, or in that year there might have been a shortage, 

 if the reservoir system had been in operation, of perhaps 0.5 inch. 

 Any such shortage would necessarily have been carried over 

 from the year 1894, when, in November, there was a runoff of 

 1.58 inches. Allowing 0.5 inch to the stream from the November 

 rainfall alone there would have been 1.08 inches remaining in 

 the reservoirs to be carried over to 1895. 



Summary of Hudson river reservoirs. In conclusion, it may be 

 said that it is entirely feasible to construct a system of reser- 

 voirs in the upper Hudson valley, and such system may be 

 designed with reference to the full capacity storage of at least 

 1300 square miles of area, or 47 per cent of the total area above 

 Glens Falls. Such control would result in the material reduc- 

 tion of floods at Glens Falls and other points. 



The proposed total storage of 45,593,000,000 cubic feet would 

 maintain 4500 cubic feet per second flow, as well as supply the 

 other necessary demands, in the driest season of the gaging 

 period. The discharge measurements show that whereas the 

 minimum unregulated flow at Glens Falls is as low as 700 cubic 

 feet per second for a monthly mean, with the storage carried out, 

 the probable monthly mean flow at Glens Falls will be at least 

 3000 to 3600 cubic feet per second. The minimum regulated flow 

 of 4500 cubic feet per second at Mechanicville will increase the 

 low-water depth in the Hudson river at Albany about 1.5 feet. 



J Tbis is the same basis as discussed on a preceding page for Salmon river 

 reservoir. 0.5 inch per month is 0.45 cubic foot per second per square mile. 



