WATER-POWERS OF SOUTH CAROLINA. 203 



storage of water will render it available at all times. This flow is ascer- 

 tained by taking twenty -eight per cent, of the rainfall as the amount dis- 

 charged by the streams. This would be something like fourteen and a 

 half inches for the middle and western water-power regions o/ South Car- 

 olina, but Mr. Swain limits it not to exceed ten inches to thirteen inches. 



III. Maximum with storage. This is the same as the last, assuming 

 that by storage (ponds arid dams) a discharge of two inches to four inches 

 on the water-shed can be added thereto, less for the larger and more for 

 the smaller areo.s. 



IV. Low season flow dry years. Without storage this flow may be de- 

 pended on. In ordinary years a quarter more may be calculated on. 



The following summary of the water-power of South Carolina, so far 

 as investigated by Mr. Swain, through correspondence or by personal ex- 

 amination, will not be liable to any charge of being an over-estimate. 



