WATER-POWERS OF ALABAMA. 



119 



JAN I FEB I MAR. I APR. MAY JUNE JULY I AUG SEPT OCT NOV. I DEC 

 20 tO 20 J 1020 1020 1020 1020 1020 I 1020 10 2O 1020 1020 I 1020 



FIG.. 15. Discharge of Black Warrior Rfiver at Tuscaloosa, Alabama, 



1899. 



Minimum monfcily discharge of Black Warrior River at Tuscaloosa, 

 Ala., with corresponding net horse power per foot of fall on a 

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



[Drainage area, 4,900 square miles.] 



