614 



NEW YORK STATE MUSEUM 



Hudson river data are, in the absence of extended gagings of 

 Salmon river, taken as applying to this stream. 



In the following tabulation we have the evaporation for the 

 months of a water year as computed in inches on the Salmon 



river catchment area for the actual reservoir area: 



December 0.043 



January 0.O2O 



February 0.021 



March 0.053 



April 0.104 



May - 0.182 



June 0.221 



July 0.192 



August 0.212 



September 0.160 



October 0.115 



November 0.057 



In designing a storage reservoir the stream is entitled to some 

 water at all seasons of the year, and computations of effective 

 storage should be made with reference to allowing a definite 

 quantity of water to go constantly to the stream. From this 

 point of view it is necessary to decide on some mean flow below 

 which the stream shall never be allowed to fall. This is done 

 in the interests of water-power plants already located on the 

 stream, fisheries, etc. In the Hudson report the quantity fixed 

 upon for storage in the upper Hudson catchment area is 0.5 

 inch per month. In cubic feet this amounts to 0.45 cubic foot 

 per second per square mile for a month of thirty days. This 

 quantity may be used in the case of the Salmon river reservoir. 

 With 0.45 cubic foot per second per square mile always flowing 

 away from the regulated catchment area, we would have in the 

 stream just below the Salmon river dam about 87 to 88 cubic feet 

 per second, which was approximately the observed low-water flow 

 in the summer of 1808. 1 



'Also see a statement on a following page in regard to uniform supply 

 allowed to flow from the Hudson reservoirs. 



