10 GEOLOGICAL SURVEY OP ALABAMA. 



and to make a weekly report of the same to the Hydrographer- 

 in-charge. As far as possible the river stations of the United 

 States Weather Bureau and the United States Engineer Corps 

 have been utilized for this purpose. From time to time the 

 Hydrographer or one of his field assistants, visits the station 

 and makes an accurate meter discharge measurement of the 

 stream, noting the height of the water on the gage at the time 

 the discharge measurement is made. After a number of such 

 discharge measurements have been made at different gage- 

 heights, a rating table is made from the data thus obtained, 

 which gives the amount of water flowing in the stream, at that 

 station, for any gage-height shown on the rod. Thus, by in- 

 spection of the table of daily gage-heights, the flow of the 

 stream is shown for every day in the- year, or years, covered by 

 the observation of gage-height. At seasons of uniform low 

 water, when the daily fluctuations of the rod are very slight for 

 weeks at a time, discharge measurements are made of the 

 stream at many points above and below the gage station in 

 order to establish a relation between the discharge at these 

 points and at the station. In like manner the principal tribu- 

 taries are measured for the same purpose, where it is practi- 

 cable to do so. In this way it is possible to arrive at a close 

 estimate of the flow of all the streams of the water-shed, and 

 make a rating of the gage for each that will represent its 

 flow under average conditions, not including the floods 

 caused by local rains. Such tributaries as have not been 

 measured can be estimated by water-shed comparison with 

 similar tributaries that have been measured. 



In the following statement the actual gage-heights and 

 discharge measurements are given in order to show the data 

 upon which the conclusions are based. The regular gage 

 stations that have been utilized are : 



Station. Stream. Observer. Paid by. 



1 Milstead, Ala Tallapoosa River Seth Johnson . . . Ala. Geo. Sv. 



2 Sturdevant, Ala Tallapoosa River B. F. Neighbors. Ala. Geo. Sv. 



3 Dadeville, Ala Big Sandy Creek T. H. Finch Ala. Geo. Sv. 



4 Alexander City, Ala.Hillabee Creek. . J. H. Chisolm. . . Ala. Geo. Sv. 



5 Nottingham, Ala. . . Talladega Creek. R. M. McClatchy.Ala. Geo. Sv. 



6 Riverside, Ala Coosa River J. W. Foster Ala. Geo. Sv. 



7 Cordova, Ala Black Warrior R A. B. Logan Ala. Geo. Sv. 



8 Montgomery, Ala.. . Alabama River. . U. S. W. B U. S. W. B. 



9 Selma, Ala Alabama River. . U. S. W. B U. S. W. B. 



10 Tuscaloosa, Ala Black Warrior R'W. S. vyman, JrU. S. Eng. C. 



11 Epes, Ala Tombigbee River J. C. Horton A. G. S. Ry. 



12 Rome, Ga Coosa River W. M. Towers. . . 0. S. W. B. 



13 Chattanooga, Tenn. Tennessee River. U. S. W. B U. S. W. B. 



