168 TRANSPORTATION OF DEBRIS BY RUNNING WATER. 



related that their results should be fairly har- measure last mentioned has been compared 



monious. In the present chapter the same with a coordinate measure of the sensitiveness 



measure of sensitiveness to mean velocity, con- of capacity to discharge, thus completing a 



verted by change of sign to a measure of sensi- circle and affording opportunity for a checking 



tiveness to depth (with discharge constant), of estimates in respect to consistency. The 



has been compared with a similar measure ratios resulting from the four comparisons are 



for depth with slope constant. Finally, the as follows: 



index of control by slope _ 

 index of control by discharge 



index of control by velocity (discharge constant) _ 

 index of control by slope 



index of control by depth (slope constant) __,., 

 index of control by discharge 



index of control by velocity (discharge constant) _ ._, 

 index of control by depth (slope constant) 



The combination, by multiplication, of the first and second equations gives 



index of control by velocity (discharge constant) _ . 

 index of control by discharge 



The combination of the third and fourth gives an equation with identical first member, but 

 the second member is 3.79. The two results differ by 8 per cent. 



