ECONOMICAL ASPECTS 



The introduction of 100 sq. mi. ft. of stored water will raise the 

 minimum flow to 1100 cu. sec. ft., a difference of 630 cu. sec. ft. 

 If now further stored water in units of 100 sq. mi. ft. is intro- 

 duced, the figure clearly shows the decreasing amount by which 

 the minimum flow is increased. It is, however, to be distinctly 

 understood that it applies solely to the minimum rate of stream- 



6000 



EFFECT OF STORED WATER 



ON 

 MINIMUM FLOW OF STREAM 



linimum Flow Without Storage 



III Illlllll 



Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec. Jan. Feb. 



FIG. 403. Effect of Stored Water on Minimum Flow. 



flow and does not mean a proportionately lower volume of water 

 available for power production. 



This decrease in minimum flow increment is shown by the curve 

 Fig. 404, which carries the stored water up to 800 sq. mi. ft., 

 resulting, in this particular instance, in the minimum flow of 2000 

 cu. sec. ft., as against 470 cu. sec. ft. without storage. 



AUXILIARY STATIONS 



In the previous section it was shown that the full economic 

 advantage of the stream, even with storage regulation, cannot be 

 secured without a source of auxiliary power. Such auxiliary 



