68 



BACKWATER CURVES — INTRODUCTORY 



TABLE 601 {Continued) 

 Bresse's Backwater Function 



be verified by inspection of equation (607). If y equals jn, dy/dx must 

 equal zero unless yn is equal to yc- This means that except in channels 

 having critical slope, all curves must approach the normal depth line 

 asymptotically. If y equals yc, dy/dx must be infinite unless yc is 



