

Figure A-6. Schematic of a river with a braided configuration with the 1950 

 and 1975 channel locations shown. 



• The 1950 channel alignment was at a larger angle to the bank than the 

 1975 channel; thus it Is likely that the erosion rates were greater 

 than 4 m per year for the 1950 alignment and less than 4 m per year for 

 the 1975 alignment. The 32 m can thus be reduced slightly, possibly to 

 28 m. If intermediate photos (between 1950 and 1975) are available, 

 this figure can be substantiated by estimating the erosion rate for the 

 more recent time period. If the year to year activity of the active 

 channels is relatively low, it can be assumed that the potential for a 

 significant change in alignment is low, and a fairly low safety factor 

 can be used. In this case, a safety factor of 1.5 applied to the 28 m 

 value would result in a buffer width of 42 m. 



• If the active channels are known to change substantially every year, 

 the reduction for alignment should not be applied and a safety factor 



90 



