Experiments in uniform Velocity of Rivers. 



447 



Fig. 9. The velocity from A to E is nearly the same ; that is, notwithstanding 

 the difference of slope, the velocity is nearly uniform, owing to increase of 

 quantity balancing decrease of slope. 



Q represents discharge per second in cubic metres. Fig. 6 to 9 and 18. 



A — Cross sections in square metres. 



V — Mean velocity in linear metres. 



FIG. 8 



A^ARBMrCRBSSSECTIONorCHANNEL 

 f?=M£ AN. RAD/US. 



-« 



(B> (G) (D) 



(10) The equation to uniform motion, that is when velocity is equal and v — V 



is (4) -=-(-+-) See explanation at end of this pamphlet (page 36), 

 i 2 \ a Q J 



and Phil. Mag., 1874, page 205. 



Fig. 9 is constructed by taking a number of channels, where observers had 

 found by experiments the exact depth and cross section of the stream, in uniform 

 motion when the^velocity and depth were known. In fact if such channels were 



FIG. 9 



constructed at different slopes, and the quantity of water flowing at each chan- 

 nel was regulated according to each case as described in the diagram, the 

 water would arrive at nearly the same uniform motion in each case.* 



This is what happens on a real navigable river. As each tributary comes in 



* See note to page 39 referring to Fig. 9, uniform motion of navigable rivers. 



