ECONOMICAL ASPECTS 



sary on the average from auxiliary power is shown by the hori- 

 zontally sectioned area. It amounts to approximately 3000 

 horse-power, which thus is required to maintain continuously the 

 full power output equal to the present wheel capacity. 



The diagram in Fig. 402 indicates what will be the limit of 



10 20 30 40 50 60 



Percentage of Time 



FIG. 401. Power-percentage of Time Curves of the Gencsee River at 



Rochester, N. Y. 



/14.000 H.P.- Capacity 

 ) of Auxiliary Plant 

 required for 40,000 

 Continuous H.P. 



(18,000 H.P. added 

 -| to Low Water 

 ( Power from Storage 



10 20 30 40 50 60 70 80 90 100 

 Percentage of Time 



FIG. 402. Power-percentage of Time Curves of the Genesee River at 



Rochester, N. Y. 



economic development, it being near the point where the regulated- 

 flow curve takes the sharp downward bend. As the installation 

 capacity increases above that amount, the percentage of time 

 during which further capacity can be used, diminishes rapidly. 



