WATER-POWERS OF ALABAMA. 



133 



Minimum monthly discharge of Tombigbee River at Columbus, Miss., 

 with corresponding net horse power per foot of fall on a water 

 realizing 80 per cent, of the theoretical power. 

 [Drainage area, 4,440 square miles.] 



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

 on this stream, near this station, for any month, multiply the tot. 

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

 that month. 



2. TOMBIGBEE RIVER NEAR EPES, ALABAMA. 



A record of gage heights has been kept at this station for the 

 last ten years by the Alabama Great Southern Railway Com- 

 pany. The gage is painted on the center brick pier of the rail- 

 way bridge of that company across the Tombigbee a half mile 

 east of Epes, and is referred to two bench marks, the first, the 

 top of the iron girder at the third cross-beam at the station, 80 

 feet from the right-bank end of the iron bridge, is 64.70 feet 

 above datum of gage ; the second, the top of the cross-tie or the 

 base of the rail at the station, 80 feet from the right-bank end 

 of he iron bridge, is 65.50 feet above datum of gage. The west 

 bank of the river is a solid wall of limestone, the east bank is 

 flat and is subject to overflow. The trestle at the east end of the 

 bridge is seven-eighths of a mile long. The section is good, 

 though the water is very deep and rather swift. 



