WATER-POWERS OF ALABAMA. 



161 



Minimum monthly discharge of Tennessee River at Chattanooga, 

 Tenn., with corresponding net horsepower per foot of fall on a 

 water wheel realizing 80 per cent, of the theoretical power. 



NOTE To find the minimum net horse power available at a shoal 

 on this stream, near this station, for any month, multiply the total 

 fall of the shoal by the "net H. P. per foot of fall" in this table for 

 that month. 



2. SHOALS IN TENNESSEE RIVER NEAR FLORENCE, ALABAMA. 



In Tennessee River, in the vicinity of Florence, Ala., (see 

 Fig. 96) , are several shoals capable of the development of power 

 in large quantities. The compiler has brought together the data 

 regarding these, his intention being not to discuss the manner 

 in which the immense water power of these shoals can be de- 

 veloped, but to give some idea of its magnitude and the possi- 

 bility of its utilization. 



The shoals are a succession of cascades amid many islands, in 

 a river bed varying in width from a half mile to three miles. 

 The numerous channels thus formed are very irregular in fall 

 and direction. The difference between high and low water is 

 only 5 or 6 feet, corresponding to a rise of 50 feet at Chatta- 

 nooga. Beginning at Brown's Ferry, 12 miles below Decatur, 

 Ala., the river has the following falls : 



