Figure A-IO, Schematic of a sinuous river showing 

 typical erosion zones. 



Other Buffer Width Factors 



River Size. In general, erosion rates increase with increasing river 

 size. This increase is primarily due to the greater discharges associated with 

 larger river size. The increase is also due to the wider valley floors filled 

 with greater quantities of generally smaller sized alluvial sediments. The 

 rate of increase of erosion rates with river size is difficult to quantify. If 

 historical rates of lateral migration are available, river size does not have 

 to be considered separately. 



Soi I Compos! t ion . The soil composition of the bank and buffer material is 

 Important to the erosion rate. Fine sands are generally the easiest to erode. 



96 



