CHAPTER IV. 



1. CAHABA RIVER AT CENTERVIKLE. ALABAMA. 



Centerville Station, on Cahaba River, is at the Bibb county 

 highway bridge, one- fourth of a mile west of the court house 

 at Centerville, Ala. The bridge is a single span iron through 

 bridge. The length of the span is about 175 feet. The floor of 

 the bridge is 411/2 feet above low water, and the stream is 130 

 feet wide at low water. 



The initial point of sounding is at the end of the iron bridge, 

 left bank, down stream. The gage is a wire gage, with rod 

 fastened to the outside of down stream guard rail, and graded 

 to feet and tenths. The gage pulley is at Station 100. Bench 

 mark Xo. i , down stream end of top of iron crossbeam under 

 the bridge floor at Station 100, from initial point is 42.85 above 

 gage datum. 



Bench mark Xo. 2, top of bottom flange of same crossbeam, 

 directly under B. M. Xo. I, is 41.40 above datum of gage. 



Banks are high, but overflow) at time of high water. 



The section is swift, and tolerably uniform, and the bottom 

 appears to be rock. 



The river observer is Mr. S. D. Hall, a merchant, who lives 

 about a quarter of a mile from the gage. 



The following discharge measurements have been made on 

 Cahaba River at Centerville, Ala. : 

 1901. 



April 25 Hydrographer, J. R. Hall; gage height, 5.50; discharge, 

 1,925 second-feet. 



Aug. 1 Hydrographer, K. T. Thomas; gage height, 1.30; dis- 

 charge, 399 second feet. 

 1902. 



Jan. 25 Hydrographer, K. T. Thomas; gage height, 5.15; dis- 

 charge, 1,707 second-feet. 



Da4ly gage height of Cahaba River at Centerville, Ala, for 1901. 



