HYDROLOGY OF NEW YORK 



623 



3) The actual runoff of the stream from the known area for a 

 series of years, and a deduction therefrom by comparison with 

 the rainfall and temperature records of the amount which may 

 be stored in the year of minimum rainfall ; also the relation which 

 the runoff in the year of minimum precipitation bears to what 

 may be expected in the average year, and a deduction therefrom 

 of the proper hight of flow lines for full-capacity development. 



4) The areas of the reservoirs and the losses therefrom by 

 evaporation which may be reasonably expected, with the amount 

 of effective storage which may be gained by the reservoir system 

 when developed to full capacity. 



5) The amount of water now diverted for the use of Cham- 

 plain canal, and the amount to be diverted for such use when the 

 enlargement is completed; also the proper method of managing 

 the system of reservoirs in order to secure ther best results to the 

 canal, the navigable section, and the waterpower. 



6) The amount of waterpower now in use on the stream and 

 the effect of the present and future diversion. 



7) The regimen of the tidal section, and the effect of the 

 unregulated fresh-water flow and of the construction of the system 

 of impounding reservoirs. 



8) The cost of the reservoirs and the relation which the 

 actual cost bears to the amount of storage gained. This latter 

 element determines the commercial feasibility of the project. 



Reservoir sites. The surveys, so far as carried, indicate that 

 economical reservoirs controlling the entire catchment area to 

 full capacity in the year of minimum rainfall may be constructed 

 in the Sacandaga r main Hudson and Schroon valleys, as shown 

 by the following paragraphs : 



The Sacandaga river has a total catchment area above its 

 mouth of 1040 square miles. The catchment areas of reservoir 

 sites on the Sacandaga river, in square miles, are as follows: 



Lakes Pleasant and Sacandaga 

 Piseco lake 



Square 

 miles 



Arietta flow 



Miscellaneous 



45 

 55 

 40 

 50 



Total 



190 



